CN101109843A

CN101109843A - Zoom lens system, imaging apparatus, method for vibration reduction, and method for varying focal length

Info

Publication number: CN101109843A
Application number: CNA2007101373150A
Authority: CN
Inventors: 伊藤智希
Original assignee: Nikon Corp
Current assignee: Nikon Corp
Priority date: 2006-07-20
Filing date: 2007-07-20
Publication date: 2008-01-23
Anticipated expiration: 2027-07-20
Also published as: CN101109843B; JP5125009B2; JP2008026558A

Abstract

A telephoto-type of zoom includes, in order from the object, a first lens group having positive power, a second lens group having negative power, a third lens group having positive power, and a fourth lens group having positive power. Upon zooming from wide-angle end to telephoto end, the distance between the first and the second lens groups increases, the distance between the second and the third lens groups decreases, and the distance between the third and the fourth lens groups varies. The third lens group consists of a front group and a rear group. Vibration reduction is carried out by moving only the rear group perpendicularly to the optical axis.

Description

The method of zoom-lens system, imaging device, oscillation damping method and change focal length

Be incorporated in the content of first to file below that this is for reference:

Submitted on July 20th, 2006 Japanese patent application 2006-198453 number; With

Submitted on Dec 18th, 2006 Japanese patent application 2006-340332 number.

Technical field

The method that the present invention relates to zoom system, imaging device, oscillation damping method and change the focal length of zoom-lens system.

Background technology

Zoom-lens system with vibration-damping function is for example proposing in Japanese Patent Application Publication 2001-166208 number.

But because its little zoom ratio, this zoom-lens system is not enough to satisfy the needs with big zoom ratio.And because the narrow visual angle under the wide-angle state, this zoom-lens system is not enough to satisfy the needs with wide visual angle.

Summary of the invention

The present invention is proposed in view of the above problems, and the purpose of this invention is to provide a kind of zoom-lens system with the big zoom ratio of having of vibration-damping function and wide visual angle, and provide a kind of imaging device, with the oscillation damping method that is used for zoom-lens system, and the method that is used to change the varifocal of zoom-lens system.

According to a first aspect of the invention, provide a kind of zoom-lens system, comprise according to this zoom-lens system of order: first lens combination with positive refractive power from object; Second lens combination with negative refractive power; The 3rd lens combination with positive refractive power; And the 4th lens combination with positive refractive power; When from the wide-angle side state when dolly-out,ing dolly-back end state zoom, the distance between this first lens combination and second lens combination changes, the distance between this second lens combination and the 3rd lens combination changes, and the distance between the 3rd lens combination and the 4th lens combination changes; According to the order from object, the 3rd lens combination comprises front lens group with positive refractive power and the rear lens group with negative refractive power; Wherein, this rear lens group is movably along the direction that is basically perpendicular to optical axis, and satisfies following conditional expression (1):

2.95＜f3/fw＜8.0 (1)

Wherein fw represents the focal length of this zoom-lens system at the wide-angle side state, and f3 represents the focal length of the 3rd lens combination.

According to a second aspect of the invention, provide a kind of imaging device that is equipped with according to the zoom-lens system of first aspect.

According to a third aspect of the invention we, a kind of method that is used to change the focal length of zoom-lens system is provided, according to order from object, this zoom-lens system comprises: first lens combination with positive refractive power, second lens combination with negative refractive power, the 3rd lens combination with positive refractive power, the 4th lens combination with positive refractive power, this method comprises the steps: to provide the 3rd lens combination, according to order from object, the 3rd lens combination comprises front lens group with positive refractive power and the rear lens group with negative refractive power; Provide along the direction that is basically perpendicular to optical axis rear lens group movably; Satisfy following conditional expression:

2.95＜f3/fw＜8.0

Wherein fw represents the focal length of this zoom-lens system at the wide-angle side state, and f3 represents the focal length of the 3rd lens combination; And by changing the distance between this first lens combination and second lens combination, change the distance between this second lens combination and the 3rd lens combination, and change distance between the 3rd lens combination and the 4th lens combination, focal length is changed to the end state of dolly-out,ing dolly-back from the wide-angle side state.

According to a forth aspect of the invention, provide a kind of zoom-lens system, comprise according to this zoom-lens system of order: first lens combination with positive refractive power from object; Second lens combination with negative refractive power; The 3rd lens combination with positive refractive power; And the 4th lens combination with positive refractive power, when from the wide-angle side state when dolly-out,ing dolly-back end state zoom, distance between this first lens combination and second lens combination changes, distance between this second lens combination and the 3rd lens combination changes, and the distance between the 3rd lens combination and the 4th lens combination changes, according to the order from object, the 3rd lens combination comprises front lens group with positive refractive power and the rear lens group with negative refractive power; Wherein, this rear lens group is movably along the direction that is basically perpendicular to optical axis, and satisfies following conditional expression (3):

-0.275＜f2/f3＜-0.100 (3)

Wherein f2 represents the focal length of this second lens combination, and f3 represents the focal length of the 3rd lens combination.

According to a fifth aspect of the invention, provide a kind of imaging device that is equipped with according to the zoom-lens system of second aspect present invention.

According to a sixth aspect of the invention, a kind of method that changes the focal length of zoom-lens system is provided, according to order from object, this zoom-lens system comprises: first lens combination with positive refractive power, second lens combination with negative refractive power, the 3rd lens combination with positive refractive power, the 4th lens combination with positive refractive power, this method comprises the steps: to provide the 3rd lens combination, according to order from object, the 3rd lens combination comprises front lens group with positive refractive power and the rear lens group with negative refractive power; Provide along the direction that is basically perpendicular to optical axis rear lens group movably; Satisfy following conditional expression (3):

-0.275＜f2/f3＜-0.100 (3)

Wherein f2 represents the focal length of this second lens combination, and f3 represents the focal length of the 3rd lens combination; And by changing the distance between this first lens combination and second lens combination, change the distance between this second lens combination and the 3rd lens combination, and change distance between the 3rd lens combination and the 4th lens combination, thereby focal length is changed to the end state of dolly-out,ing dolly-back from the wide-angle side state.

From the detailed description of following most preferred embodiment with accompanying drawing, be readily appreciated that other features and advantages of the present invention.

Description of drawings

Fig. 1 illustrates according to the zoom-lens system of the example 1 of first embodiment with according to the zoom-lens system of the example 6 of second embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Fig. 2 A and 2B be illustrate respectively according to the zoom-lens system of the example 1 of first embodiment and according to the zoom-lens system of the example 6 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma under the focusing wide-angle side state at infinity.

Fig. 3 illustrates according to the zoom-lens system of the example 1 of first embodiment with according to the curve map of the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 6 of second embodiment.

Fig. 4 A and 4B illustrate according to the zoom-lens system of the example 1 of first embodiment respectively and are curve map according to the zoom-lens system of the example 6 of second embodiment at various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and coma under the focusing end state of dolly-out,ing dolly-back at infinity.

Fig. 5 illustrates according to the zoom-lens system of the example 2 of first embodiment with according to the zoom-lens system of the example 8 of second embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Fig. 6 A and 6B be illustrate respectively according to the zoom-lens system of the example 2 of first embodiment and according to the zoom-lens system of the example 8 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma under the focusing wide-angle side state at infinity.

Fig. 7 illustrates according to the zoom-lens system of the example 2 of first embodiment with according to the curve map of the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 8 of second embodiment.

Fig. 8 A and 8B be illustrate respectively according to the zoom-lens system of the example 2 of first embodiment and according to the zoom-lens system of the example 8 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma under the focusing end state of dolly-out,ing dolly-back at infinity.

Fig. 9 illustrates according to the zoom-lens system of the example 3 of first embodiment with according to the zoom-lens system of the example 9 of second embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Figure 10 A and 10B be illustrate respectively according to the zoom-lens system of the example 3 of first embodiment and according to the zoom-lens system of the example 9 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma under the focusing wide-angle side state at infinity.

Figure 11 illustrates according to the zoom-lens system of the example 3 of first embodiment with according to the curve map of the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 9 of second embodiment.

Figure 12 A and 12B be illustrate respectively according to the zoom-lens system of the example 3 of first embodiment and according to the zoom-lens system of the example 9 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma under the focusing end state of dolly-out,ing dolly-back at infinity.

Figure 13 illustrates according to the zoom-lens system of the example 4 of first embodiment with according to the zoom-lens system of the example 10 of second embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Figure 14 A and 14B be illustrate respectively according to the zoom-lens system of the example 4 of first embodiment and according to the zoom-lens system of the example 10 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma under the focusing wide-angle side state at infinity.

Figure 15 illustrates according to the zoom-lens system of the example 4 of first embodiment with according to the curve map of the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 10 of second embodiment.

Figure 16 A and 16B be illustrate respectively according to the zoom-lens system of the example 4 of first embodiment and according to the zoom-lens system of the example 10 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma under the focusing end state of dolly-out,ing dolly-back at infinity.

Figure 17 illustrates according to the zoom-lens system of the example 5 of first embodiment with according to the zoom-lens system of the example 11 of second embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Figure 18 A and 18B be illustrate respectively according to the zoom-lens system of the example 5 of first embodiment and according to the zoom-lens system of the example 11 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma under the focusing wide-angle side state at infinity.

Figure 19 illustrates according to the zoom-lens system of the example 5 of first embodiment with according to the curve map of the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 11 of second embodiment.

Figure 20 A and 20B be illustrate respectively according to the zoom-lens system of the example 5 of first embodiment and according to the zoom-lens system of the example 11 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma under the focusing end state of dolly-out,ing dolly-back at infinity.

Figure 21 illustrates according to the zoom-lens system of the example 7 of second embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Figure 22 A and 22B illustrate respectively according to the zoom-lens system of the example 7 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma under the focusing wide-angle side state at infinity.

Figure 23 is the curve map that illustrates according to the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 7 of second embodiment.

Figure 24 A and 24B illustrate respectively according to the zoom-lens system of the example 7 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma under the focusing end state of dolly-out,ing dolly-back at infinity.

Figure 25 illustrates the synoptic diagram of utilization according to the imaging device of the zoom-lens system of the example 1 of first embodiment.

Embodiment

[first embodiment]

The following describes the zoom-lens system according to first embodiment, imaging device is used for the method for vibration damping and is used to change the method for focal length.

Zoom-lens system according to first embodiment, comprise according to order: first lens combination with positive refractive power from object, second lens combination with negative refractive power has the 3rd lens combination of positive refractive power, has the 4th lens combination of positive refractive power.When from the wide-angle side state when dolly-out,ing dolly-back end state zoom, the distance between this first lens combination and second lens combination increases, the distance between this second lens combination and the 3rd lens combination reduces, and the variable in distance between the 3rd lens combination and the 4th lens combination.According to the order from object, the 3rd lens combination comprises front lens group with positive refractive power and the rear lens group with negative refractive power.When camera-shake takes place, realize vibration damping by only moving this rear lens group along the direction that is basically perpendicular to optical axis.Satisfy following conditional expression (1):

2.95＜f3/fw＜8.0 (1)

Because it is littler than other lenses group that the 3rd lens combination can manufacture on diameter, the 3rd lens combination is fit to be equipped with damper mechanism.Because the 3rd lens combination is made of front lens group with positive refractive power and the rear lens group with negative refractive power, and only use this rear lens group as the vibration damping lens combination, therefore this damper mechanism can be very compact, and the weight of vibration damping lens combination can reduce.And the power of lens of the 3rd lens combination distributes and can suitably be provided with.Therefore, when the generation camera-shake carries out vibration damping by moving this rear lens group along the direction that is basically perpendicular to optical axis, can make the decline of optical property very little.

Conditional expression (1) has defined the suitable focal range of the 3rd lens combination at the focal length of wide-angle side state with respect to this zoom-lens system.

When the ratio of f3/fw be equal to or less than conditional expression (1) following in limited time, increase in the astigmatism and the curvature of field of wide-angle side state.In order to ensure effect of the present invention, the lower limit of optimum condition expression formula (1) is set to 3.00.

On the other hand, when the ratio of f3/fw is equal to or greater than going up in limited time of conditional expression (1), the mobile quantitative change of the 3rd lens combination and the 4th lens combination is big, makes the compactedness that realizes zoom-lens system become difficulty.When the refracting power that makes first lens combination and second lens combination becomes greatly when alleviating this effect, the spherical aberration of taking the photograph the far-end state increases and becomes big, so this is undesirable.In order to ensure effect of the present invention, the upper limit of optimum condition expression formula (1) is set to 6.00.

Zoom-lens system according to first embodiment preferably satisfies following conditional expression (2):

0.56＜f3/ft＜2.0 (2)

Wherein ft represents this zoom-lens system at the focal length of end state of dolly-out,ing dolly-back, and f3 represents the focal length of the 3rd lens combination.

When the ratio of f3/ft equal with less-than condition expression formula (2) following in limited time, become very outstanding by the eccentric coma that produces such as the eccentric relatively production error between the lens combination, so this is undesirable.And it is big to increase change in the spherical aberration of taking the photograph the far-end state.In order to ensure effect of the present invention, the lower limit of optimum condition expression formula (2) is set to 0.60.

On the other hand, when the ratio of f3/ft is equal to or greater than going up in limited time of conditional expression (2), it is big that the total length of this zoom-lens system and diameter become, and makes that it is used for practical application becomes very difficult.And it is big that aperture diaphragm and damper mechanism become, so this is undesirable.When the reflection potential that makes second lens combination becomes greatly when alleviating this effect, the astigmatism and the curvature of field of wide-angle side state worsen, so this is undesirable.In order to ensure effect of the present invention, the lower limit of optimum condition expression formula (2) is set to 1.50.

In zoom-lens system according to first embodiment of the invention, preferred, satisfy following conditional expression (3):

-0.275＜f2/f3＜-0.100 (3)

Conditional expression (3) has defined the suitable focal range of second lens combination with respect to the focal length of the 3rd lens combination.

When the ratio of f2/f3 equals to proofread and correct the coma of wide-angle side state simultaneously in limited time with the following of less-than condition expression formula (3), take the photograph the spherical aberration of far-end state, and the bending change of light field becomes very difficult during vibration damping.Therefore this is undesirable.

On the other hand, when the ratio of f2/f3 is equal to or greater than going up in limited time of conditional expression (3), it is big that the refracting power of second lens combination becomes, and the astigmatism of wide-angle side state and the curvature of field degenerate and become clearly, so this is undesirable.In order to ensure effect of the present invention, the upper limit of conditional expression (3) is set to-0.15.

In zoom-lens system according to first embodiment of the invention, when from the wide-angle side state when taking the photograph far-end state zoom, preferred, move first lens combination, the 3rd lens combination and the 4th lens combination.

Because this lens arrangement can be simplified the travel mechanism that is used for moving each lens combination, make that this zoom-lens system can be compact.

In zoom-lens system, preferably completely permitted following conditional expression (4) according to first embodiment:

0＜D3W-D3T (4)

Wherein D3W is illustrated in the distance between wide-angle side state the 3rd lens combination and the 4th lens combination, and D3T is being illustrated in the distance of taking the photograph between far-end state the 3rd lens combination and the 4th lens combination.

Conditional expression (4) has defined at the wide-angle side state from the distance of the 3rd lens combination to the four lens combination with taking the photograph the proper range of far-end state from the difference between the distance of the 3rd lens combination to the four lens combination.

When the value of D3W-D3T is equal to or less than under the conditional expression (4) in limited time, when from the wide-angle side state when taking the photograph far-end state zoom, can not suppress the variation of the curvature of field, so this is undesirable.In order to ensure effect of the present invention, the lower limit of optimum condition expression formula (4) is set to 2.0.

In zoom-lens system, preferably satisfy following conditional expression (5) according to first embodiment:

0.24＜f31/ft＜0.41 (5)

Wherein ft represents this zoom-lens system at the focal length of taking the photograph the far-end state, and f31 represents the focal length of this front lens group.

Conditional expression (5) has defined the proper range of the focal length of this front lens group at the focal length of taking the photograph the far-end state with respect to this zoom-lens system.

When the ratio of f31/ft is equal to or less than under the conditional expression (5) in limited time, during vibration damping, with respect to the amount of movement of rear lens group, the mobile quantitative change of image is big.Therefore, the off-centre of controlling this rear lens group becomes very difficult, and very little eccentric error causes that optical property descends, and makes that proofreading and correct eccentric coma becomes very difficult.

On the other hand, when the ratio of f31/ft is equal to or greater than going up in limited time of conditional expression (5), during vibration damping, with respect to moving of this rear lens group, the mobile of image diminishes.Therefore, obtain the amount of movement of image necessity for vibration damping, the mobile quantitative change of rear lens group is big, when making vibration damping the variation on correcting imaging plane and eccentric coma become very difficult.In order to ensure effect of the present invention, preferably condition is expressed (5) upper limit and is set to 0.38.

In zoom-lens system, preferably satisfy following conditional expression (6) according to first embodiment:

2.15＜Bfw/fw＜3.50 (6)

Wherein fw is expressed the focal length of this zoom-lens system at the wide-angle side state, and Bfw represents the back focal length of this zoom-lens system at the wide-angle side state.

When this zoom-lens system being used for Interchangeable lens type single-lens reflex mirror digital camera, conditional expression (6) has defined the proper range of this back focal length.

When the ratio of Bfw/fw is equal to or greater than going up in limited time of conditional expression (6), it is too big that this back focal length becomes, and makes total focal length become big.And when this back focal length diminished, the astigmatism and the curvature of field under the wide-angle side state worsened.In order to ensure effect of the present invention, the upper limit of optimum condition expression formula (6) is set to 3.00.

On the other hand, when the ratio of Bfw/fw is equal to or less than under the conditional expression (6) in limited time, it is too little that this back focal length becomes, and makes the image-side of this zoom-lens system, and promptly disturb mutually with the fast return reflective mirror of SLR camera at the rear portion of this zoom-lens system.In order to ensure effect of the present invention, the lower limit of optimum condition expression formula (6) is set to 2.20.

In zoom-lens system according to first embodiment, the expression formula that preferably satisfies condition (7):

1.4＜f3/f4＜5.0 (7)

Wherein f3 represents the focal length of the 3rd lens combination, and f4 represents the focal length of the 4th lens combination.

Conditional expression (7) has defined the proper range of the focal length of the focal length of the 3rd lens combination and the 4th lens combination.

When the ratio of f3/f4 equal with less-than condition expression formula (7) following in limited time, it is big that the refracting power of the 3rd lens combination becomes, and makes to worsen in the spherical aberration of taking the photograph the far-end state.

On the other hand, when the ratio of f3/f4 is equal to or greater than going up in limited time of conditional expression (7), it is big that the refracting power of the 4th lens combination becomes, and makes to proofread and correct the curvature of field and coma becomes very difficult.

In order to ensure effect of the present invention, the upper limit of optimum condition expression formula (7) is set to 3.0.

In zoom-lens system according to first embodiment, preferably this rear lens group the lens surface of close object side be non-ball surface.

Because this structure can fully suppress degenerating of eccentric coma when departing from this rear lens group.

In the zoom-lens system according to first embodiment, preferred, at least one aspheric surface is included in the 4th lens combination.

Because this structure, preferably proofread and correct the distortion of wide-angle side state, the curvature of field and astigmatism and spherical aberration and the coma of taking the photograph the far-end state become possibility.

In zoom-lens system, preferably focus by move second lens combination along optical axis according to first embodiment.

Because the refracting power of second lens combination is big, the amount of movement of second lens combination can be little.Therefore, total length of lens of zoom-lens system is constant big.Because second lens combination is lighter than first lens combination on weight.Load on the driving mechanism can reduce.

Imaging device according to first embodiment is equipped with above-mentioned zoom-lens system.

Because this structure can provide according to the imaging device that high zoom ratios and wide visual angle are arranged with vibration-damping function.

A kind of oscillation damping method that is used to realize according to the zoom-lens system of first embodiment, according to order from object, this zoom-lens system comprises: first lens combination with positive refractive power, second lens combination with negative refractive power, the 3rd lens combination with positive refractive power, the 4th lens combination with positive refractive power, this method comprises the steps: by increasing distance between this first lens combination and second lens combination, reduce distance between this second lens combination and the 3rd lens combination, and change the distance between the 3rd lens combination and the 4th lens combination, thereby focal length is changed to the far-end state of taking the photograph from the wide-angle side state; Satisfy following conditional expression (1):

2.95＜f3/fw＜8.0 (1)

Wherein fw represents the focal length of this zoom-lens system at the wide-angle side state, and f3 represents the focal length of the 3rd lens combination; The 3rd lens combination is provided, and according to the order from object, the 3rd lens combination comprises front lens group with positive refractive power and the rear lens group with negative refractive power; And when camera-shake takes place, by only moving the correction that this rear lens group is realized imaging plane along the direction that is basically perpendicular to optical axis.

In this way, can realize having vibration-damping function to have the zoom-lens system at high zoom ratios and wide visual angle.

A kind of method that is used to change according to the focal length of the zoom-lens system of first embodiment, according to order from no object, this zoom-lens system comprises: first lens combination with positive refractive power, second lens combination with negative refractive power, the 3rd lens combination with positive refractive power, and the 4th lens combination with positive refractive power, this method comprises the steps: to provide the 3rd lens combination, according to order from object, the 3rd lens combination comprises front lens group with positive refractive power and the rear lens group with negative refractive power; When camera-shake takes place, by only moving the correction that this rear lens group is realized imaging plane along the direction that is basically perpendicular to optical axis.Satisfy following conditional expression (1):

2.95＜f3/fw＜8.0 (1)

Wherein fw represents the focal length of this zoom-lens system at the wide-angle side state, and f3 represents the focal length of the 3rd lens combination; And by increasing the distance between this first lens combination and second lens combination, reduce the distance between this second lens combination and the 3rd lens combination, and change the distance between the 3rd lens combination and the 4th lens combination, thereby focal length is changed to the end state of dolly-out,ing dolly-back from the wide-angle side state.

Below with reference to description of drawings umerical each example according to the zoom-lens system of first embodiment

＜example 1 〉

Fig. 1 illustrates according to the zoom-lens system of the example 1 of first embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Zoom-lens system according to example 1, comprise according to order: the first lens combination G1 with positive refractive power from object, the second lens combination G2 with negative refractive power has the 3rd lens combination G3 of positive refractive power, and the 4th lens combination G4 with positive refractive power.

This first lens combination G1 comprises according to the order from object: by have towards the negative meniscus lens L11 of the nonreentrant surface of object with have the balsaming lens that constitutes towards the positive meniscus shaped lens L12 gummed of the nonreentrant surface of object and have towards the positive falcate L13 of the nonreentrant surface of object.

This second lens combination G2 comprises according to the order from object: has towards the negative meniscus lens L21 of the nonreentrant surface of object, and double-concave negative lens L22, biconvex positive lens L23, and have towards the negative meniscus lens L24 on the recessed surface of object.The negative meniscus lens L21 of close object side is a non-spherical lens in the second lens combination G2, is formed on the resin bed that puts on the object side glass surface on non-ball surface on these lens.

The 3rd lens combination G3 comprises according to the order from object: front lens group G31 and the rear lens group G32 with negative refractive power with positive refractive power.

This front lens group G31 according to the order from object comprise have towards the positive meniscus shaped lens L31 in the recessed surface of object and by biconvex positive lens L32 with have towards object the balsaming lens that constitutes of the negative meniscus lens L33 gummed on recessed surface.

This rear lens group G32 comprises: glue together the balsaming lens that constitutes according to the order from object by double-concave negative lens L34 and biconvex positive lens L35.In this rear lens group G32, the double-concave negative lens L34 of close object side is a non-spherical lens, and on these lens, non-ball surface is formed on the resin bed that puts on the object side glass surface.

The 4th lens combination G4 comprises according to the order from object: by having the balsaming lens that constitutes towards the negative meniscus lens L41 and the biconvex positive lens L42 gummed of the nonreentrant surface of object, and by towards the positive meniscus shaped lens L43 in the recessed surface of object with have the balsaming lens that constitutes towards the negative meniscus lens L44 gummed on the recessed surface of object.The negative meniscus lens L44 of close image-side is a non-spherical lens, and on these lens, the image-side surface is formed by aspheric surface.

In the zoom-lens system according to example 1, aperture diaphragm S is arranged near the object side of the 3rd lens combination G3, and when moving with the 3rd lens combination G3 is whole when taking the photograph far-end state zoom from the wide-angle side state.

Because this lens arrangement, in zoom-lens system according to example 1, this first lens combination G1, the 3rd lens combination G3, and the 4th lens combination G4 to movement of objects, and this second lens combination G2 also moves, and makes that the distance between this first lens combination G1 and the second lens combination G2 increases, distance between this second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 reduces.

In zoom-lens system according to example 1, when camera shake takes place, only move this rear lens group G32 along the direction that is basically perpendicular to optical axis and be embodied as the picture plane correction, in other words, realize vibration damping.

In zoom-lens system, realize by this second lens combination G2 being shifted to object as far as focusing near object from infinite according to example 1.

With list in the table 1 according to the relevant various values of the zoom system of the example 1 of first embodiment.In [technical specification], f represents the focal length of this zoom-lens system, and FNO represents the f number, and 2 ω represent visual angle (unit: degree).

In [lens data], the most left row " N " illustrate according to the lens surface numbering from the sequential counting of object side, secondary series " r " illustrates the radius-of-curvature of this lens surface, the 3rd row " d " illustrate the distance of next lens surface, the 4th row " vd " are illustrated in the d line, and (Abbe number of this material of wavelength X=587.6nm) locate, the 5th row " nd " illustrate and are illustrated in the d line (refractive index of this material of wavelength X=587.6nm) locate.The right side that the position on non-ball surface is used in this surface number adds asterisk " * " expression, and in paraxial radius-of-curvature shown in the secondary series " r ", in secondary series " r ", r=0.0000 represents plane surface.In the 3rd row " d ", BF represents back focal length.In the 5th row " nd ", the refractive index n d=1.0000 of air is omitted.

In [aspherical surface data], " E-n " expression " 10-n ".In each example, aspheric surface is represented with following expression formula:

X＝(h ²/r)/[1+[1-κ(h ²/r ²)] ^1/2]+C4×h ⁴+C6×h ⁶

+C8×h ⁸+C10×h ¹⁰+C12×h ¹²+C14×h ¹⁴

Wherein h represents the vertical height of optical axis, X represents sag of chain, promptly the section along optical axis from the summit on this non-ball surface is the distance on this non-ball surface at y place to the vertical height with this optical axis, r represents the radius-of-curvature with reference to sphere, κ represents the circular cone coefficient, and Cn represents the asphericity coefficient on n rank.

In [variable range], f represents focal length, and BF represents back focal length.

Be used for the table of various values, " mm " is usually as such as focal length, radius-of-curvature with to the long measure of the distance of next lens surface.But because same optical can obtaining from the optical system of amplifying in proportion or dwindle its size, so unit is not necessarily limited to " mm ", and can be with any suitable unit.

The explanation of reference symbol is same in other examples, therefore saves the explanation of repetition.

At focal length is in the zoom-lens system of f, when camera shake takes place when, damping coefficient, promptly, the amount of movement of the image on the imaging plane is K to the ratio of the amount of movement that moves this lens combination perpendicular to optical axis, in order to proofread and correct the camera shake that angle is the rotation of θ, in order to proofread and correct this camera shake, this lens combination that moves can move the amount of (ftan θ)/K perpendicular to optical axis.In Shuo Ming other examples, this relation is the same in the back, so the explanation that repeats is omitted.

In the wide-angle side state (W) of example 1, damping coefficient K is 1.102, and focal length is 16.4 (mm), so in order to proofread and correct the rotation camera shake of 0.80 degree, the amount of movement of this rear lens group G32 is 0.208 (mm).In taking the photograph far-end state (T), damping coefficient K is 1.800, and focal length is 83.0 (mm), so in order to proofread and correct the rotation camera shake of 0.35 degree, the amount of movement of this rear lens group G32 is 0.282 (mm).

Table 1

[technical specification]

W M T

f＝ 16.4 24.2 83.0

FNO＝ 3.6 4.5 5.7

2ω＝ 86.7 62.4 19.9

[lens data]

N r d vd nd

1 171.726 2.000 23.8 1.846660

2 58.558 6.221 49.6 1.772499

3 826.359 0.100

4 46.796 4.360 46.6 1.804000

5 102.445 (D1)

6 ^* 372.183 0.200 38.1 1.553890

7 93.131 1.200 42.7 1.834807

8 11.766 6.314

9 -27.242 1.200 42.7 1.834807

10 47.860 0.490

11 34.246 3.715 23.8 1.846660

12 -26.693 0.635

13 -19.148 1.200 37.2 1.834000

14 -39.779 (D2)

15 ∞, 1.000 aperture diaphragm S

16 -425.372 2.224 70.4 1.487490

17 -19.527 0.100

18 18.849 3.279 70.4 1.487490

19 -22.378 1.000 40.8 1.882997

20 -117.992 2.500

21 ^* -28.515 0.150 38.1 1.553890

22 -30.597 1.000 42.7 1.834807

23 19.080 2.431 28.5 1.728250

24 -100.146 2.000

25 0.000 (D3)

26 32.711 4.269 23.8 1.846660

27 19.344 7.251 82.5 1.497820

28 -28.413 0.200

29 -197.723 3.007 82.5 1.497820

30 -31.076 2.000 46.6 1.766098

31 ^* -54.725 (BF)

[aspherical surface data]

Surface number: 6

κ＝17.1808

C4＝4.07840E-05

C6＝-1.47070E-07

C8＝1.73490E-10

C10＝3.50610E-12

C12＝-0.24029E-13

C14＝0.51556E-16

Surface number: 21

κ＝2.7193

C4＝3.17430E-05

C6＝8.22330E-08

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 31

κ＝6.4334

C4＝1.65030E-05

C6＝-5.27060E-09

C8＝5.36500E-10

C10＝-5.29690E-12

C12＝0.20134E-13

C14＝-0.18195E-16

[variable range]

W M T

f 16.39999 24.19997 82.99980

D1 2.17905 9.29038 35.23893

D2 19.76656 12.67294 1.20078

D3 7.69778 4.92538 1.00000

BF 38.57713 47.10464 73.28825

[value that is used for conditional expression]

(1)：f3/fw＝3.107

(2)：f3/ft＝0.614

(3)：f2/f3＝-0.245

(4)：D3W-D3T＝6.69778

(5)：f31/ft＝0.297

(6)：Bfw/fw＝2.352

(7)：f3/f4＝1.361

Fig. 2 A and 2B illustrate respectively according to the zoom-lens system of the example 1 of first embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma under the focusing wide-angle side state at infinity.

Fig. 3 is the curve map that illustrates according to the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 1 of first embodiment.

Fig. 4 A and 4B are that illustrating according to the zoom-lens system of the example 1 of first embodiment respectively is curve map at various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and coma under the focusing end state of dolly-out,ing dolly-back at infinity.

In each curve map, FNO represents the f number, and A represents half angle of view (unit: degree).

In each curve map of spherical aberration was shown, FNO represented the f number with respect to the maximum diameter of hole diaphragm.In each curve map of astigmatism and distortion is shown, the maximal value of half angle of view is shown.In each curve map of coma is shown, the coma with respect to half angle of view is shown.In each curve map, d is illustrated in the d line, and (aberration curve of wavelength X=587.6nm) locate, g are illustrated in the g line (aberration curve of wavelength X=435.8nm) locate.Solid line is represented sagittal image surface in the curve map of astigmatism is shown, and is shown in dotted line meridianal image surface.

Above-mentioned explanation about various aberrations is identical with other examples.

As seeing, owing to proofread and correct the result of the various aberrations under wide-angle side state, medium focal length state and the end state of dolly-out,ing dolly-back well, fabulous optical property is shown according to the zoom lens system of the example 1 of first embodiment from each curve map is clear.

Example 2

Fig. 5 illustrates according to the zoom-lens system of the example 2 of first embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Zoom-lens system according to example 2 comprises according to the order from object: the first lens combination G1 with positive refractive power, the second lens combination G2 with negative refractive power, have the 3rd lens combination G3 of positive refractive power, and the 4th lens combination G4 with positive refractive power.

This second lens combination G2 comprises according to the order from object: has towards the negative meniscus lens L21 of the nonreentrant surface of object, and double-concave negative lens L22, biconvex positive lens L23, and have towards the negative meniscus lens L24 on the recessed surface of object.The negative meniscus lens L21 of close object side is a non-spherical lens in second lens combination, is formed on the resin bed that puts on the object side glass surface on non-ball surface on these lens.

This front lens group G31 comprises according to the order from object: biconvex positive lens L31 and the balsaming lens that is made of biconvex positive lens L32 and double-concave negative lens L33 gummed.

This rear lens group G32 comprises: glue together the balsaming lens that constitutes according to the order from object by double-concave negative lens L34 and biconvex positive lens L35.In this rear lens group G32, the double-concave negative lens L34 of close object side is a non-spherical lens, is formed on the resin bed that puts on the object side glass surface on non-ball surface on these lens.

The 4th lens combination G4 comprises according to the order from object: biconvex positive lens L41, with by having the balsaming lens that constitutes towards the negative meniscus lens L42 and the biconvex positive lens L43 gummed of the nonreentrant surface of object, and have towards the recessed surperficial negative meniscus lens L44 of object.The negative meniscus lens L44 of close image-side is a non-spherical lens, and on these lens, the image-side surface is formed by aspheric surface.

In the zoom-lens system according to example 2, aperture diaphragm S is arranged near the object side of the 3rd lens combination G3, and when moving with the 3rd lens combination G3 is whole when taking the photograph far-end state zoom from the wide-angle side state.

Because this lens arrangement, in zoom-lens system according to example 2, this first lens combination G1, the 3rd lens combination G3, and the 4th lens combination G4 to movement of objects, and this second lens combination G2 also moves, and makes that the distance between this first lens combination G1 and the second lens combination G2 increases, distance between this second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 reduces.

In zoom-lens system according to example 2, when camera shake takes place, be embodied as the picture plane correction by only moving this rear lens group G32 along the direction that is basically perpendicular to optical axis, in other words, realize vibration damping.

In zoom-lens system, pass through to realize towards this second lens combination of movement of objects G2 from infinite focusing as far as close object according to example 2.

With list in the table 2 according to the various values of the relevant zoom-lens system of the example 2 of first embodiment.

In the wide-angle side state (W) of example 2, damping coefficient K is 0.880, and focal length is 16.4 (mm), so in order to proofread and correct the rotation camera shake of 0.80 degree, the amount of movement of rear lens group G32 is 0.260 (mm).In taking the photograph far-end state (T), damping coefficient K is 1.500, and focal length is 83.0 (mm), so in order to proofread and correct the rotation camera shake of 0.35 degree, the amount of movement of rear lens group G32 is 0.338 (mm).

Table 2

[technical specification]

W M T

f＝ 16.4 33.9 83.0

FNO＝ 3.6 4.5 5.7

2ω＝ 86.5 46.4 20.0

[lens data]

N r d vd nd

1 186.010 2.000 23.8 1.846660

2 57.108 6.824 52.3 1.754998

3 1445.904 0.100

4 44.873 4.642 42.7 1.834807

5 94.419 (D1)

6 ^* 520.086 0.150 38.1 1.553890

7 85.835 1.200 46.6 1.816000

8 11.870 6.042

9 -25.454 1.200 42.7 1.834807

10 55.451 0.539

11 39.367 3.574 23.8 1.846660

12 -27.649 0.744

13 -18.401 1.200 42.7 1.834807

14 -34.541 (D2)

15 ∞, 1.000 aperture diaphragm S

16 32.804 2.550 52.3 1.517420

17 -25.691 0.200

18 33.873 2.784 82.5 1.497820

19 -18.357 1.000 42.7 1.834807

20 2477.502 2.500

21 ^* -32.917 0.150 38.1 1.553890

22 -33.614 1.000 42.7 1.834807

23 43.144 1.625 23.8 1.846660

24 -346.476 2.000

25 0.000 (D3)

26 23.264 4.823 70.0 1.518601

27 -78.743 0.200

28 74.714 1.360 32.4 1.850260

29 22.000 6.579 82.5 1.497820

30 -26.508 0.412

31 -34.173 1.600 46.5 1.762260

32 ^* -58.732 (BF)

[aspherical surface data]

Surface number: 6

κ＝-2.1764

C4＝4.70240E-05

C6＝-2.04990E-07

C8＝1.13690E-09

C10＝-4.83300E-12

C12＝0.10986E-13

C14＝0.00000E+00

Surface label: 21

κ＝-1.4217

C4＝-1.31640E-06

C6＝5.43730E-08

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 32

κ＝5.7116

C4＝3.09920E-05

C6＝2.85680E-08

C8＝9.03240E-10

C10＝-7.28720E-12

C12＝0.29235E-13

C14＝0.00000E+00

[variable range]

W M T

f 16.39998 33.91908 82.99980

D1 2.13822 16.04163 34.70001

D2 16.95004 7.51901 1.20000

D3 7.82663 3.50000 1.00000

BF 37.99995 53.02618 70.00001

[value that is used for conditional expression]

(1)：f3/fw＝3.849

(2)：f3/ft＝0.761

(3)：f2/f3＝-0.194

(4)：D3W-D3T＝6.82663

(5)：f31/ft＝0.362

(6)：Bfw/fw＝2.317

(7)：f3/f4＝2.015

Fig. 6 A and 6B illustrate respectively according to the various aberrations when the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma under the zoom-lens system focusing wide-angle side state at infinity of the example 2 of first embodiment.

Fig. 7 is the curve map that illustrates according to the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 2 of first embodiment.

Fig. 8 A and 8B illustrate respectively according to the zoom-lens system of the example 2 of first embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma under the focusing end state of dolly-out,ing dolly-back at infinity.

As seeing, owing to proofread and correct result well, fabulous optical property is shown according to the zoom lens system of the example 2 of first embodiment at the various aberrations of wide-angle side state, medium focal length state and the end state of dolly-out,ing dolly-back from each curve map is clear.

Example 3

Fig. 9 illustrates according to the zoom-lens system of the example 3 of first embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Zoom-lens system according to example 3 comprises according to the order from object: the first lens combination G1 with positive refractive power, the second lens combination G2 with negative refractive power, have the 3rd lens combination G3 of positive refractive power, and the 4th lens combination G4 with positive refractive power.

This front lens group G31 comprises according to the order from object: biconvex positive lens L31 and by biconvex positive lens L32 with have the balsaming lens that constitutes towards the negative meniscus lens L33 gummed on the recessed surface of object.

This rear lens group G32 comprises: according to from the order of object by double-concave negative lens L34 with have the balsaming lens that constitutes towards the positive meniscus shaped lens L35 gummed of the nonreentrant surface of object.In this rear lens group G32, the double-concave negative lens L34 of close object side is a non-spherical lens, is formed on the resin bed that puts on the object side glass surface on non-ball surface on these lens.

The 4th lens combination G4 comprises according to the order from object: have towards the positive meniscus shaped lens L41 on the recessed surface of object, with the balsaming lens that constitutes by biconvex positive lens L42 and double-concave negative lens L43 gummed, and have towards the recessed surperficial negative meniscus lens L44 of object.The most positive meniscus shaped lens L41 of close object side is a non-spherical lens, and on these lens, object side surface is formed by aspheric surface.

In the zoom-lens system according to example 3, aperture diaphragm S is arranged near the object side of the 3rd lens combination G3, and when moving with the 3rd lens combination G3 is whole when taking the photograph far-end state zoom from the wide-angle side state.

Because this lens arrangement, in zoom-lens system according to example 3, this first lens combination G1, the 3rd lens combination G3, and the 4th lens combination G4 to movement of objects, and this second lens combination G2 also moves, and makes that the distance between this first lens combination G1 and the second lens combination G2 increases, distance between this second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 reduces.

In zoom-lens system according to example 3, when going out the generator shake, only move this rear lens group G3 along the direction that is basically perpendicular to optical axis and be embodied as the picture plane correction, in other words, realize vibration damping.

In zoom-lens system, realize by this second lens combination G2 being shifted to object as far as focusing near object from infinite according to example 3.

With list in the table 3 according to the relevant various data of the zoom-lens system of first examples Example 3.

Damping coefficient K is 1.104 in the wide-angle side state (W) of example 3, and focal length is 16.4 (mm), is 0.207 (mm) so be used to proofread and correct the amount of movement of rear lens group G32 of the rotation camera shake of 0.80 degree.In taking the photograph far-end state (T), damping coefficient K is 1.891, and focal length is 83.0 (mm), is 0.279 (mm) so be used to proofread and correct the amount of movement of rear lens group G32 of shake of the rotation camera of 0.35 degree.

Table 3

[technical specification]

W M T

f＝ 16.4 34.1 83.0

FNO＝ 3.6 4.4 5.4

2ω＝ 87.5 47.0 20.3

[lens data]

N r d vd nd

1 269.486 2.000 23.8 1.846660

2 67.239 7.217 49.6 1.772499

3 22008.798 0.100

4 49.607 4.504 42.7 1.834807

5 105.112 (D1)

6 ^* 262.081 0.150 38.1 1.553890

7 95.557 1.200 46.6 1.816000

8 12.537 7.088

9 -31.137 1.200 46.6 1.804000

10 56.257 0.100

11 36.553 3.806 23.8 1.846660

12 -40.735 0.704

13 -25.479 1.200 42.7 1.834807

14 -45.309 (D2)

15 ∞, 1.000 aperture diaphragm S

16 29.426 2.685 70.4 1.487490

17 -26.404 0.200

18 25.849 2.916 82.5 1.497820

19 -21.717 1.000 42.7 1.834807

20 -2212.439 2.500

21 ^* -36.151 0.100 38.1 1.553890

22 -34.195 1.000 46.6 1.816000

23 21.952 1.776 25.4 1.805181

24 171.806 2.000

25 0.000 (D3)

26 ^* -261.293 2.565 61.1 1.589130

27 -31.706 0.200

28 39.43?1 2.991 82.5 1.497820

29 -123.144 1.248 23.8 1.846660

30 48.841 2.165

31 -69.810 3.425 65.4 1.603001

32 -21.259 (BF)

[aspherical surface data]

Surface number: 6

κ＝1.0000

C4＝2.75610E-05

C6＝-7.17460E-08

C8＝1.32080E-10

C10＝-1.28130E-13

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 21

κ＝1.5000

C4＝1.52920E-05

C6＝3.43650E-08

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 26

κ＝9.9454

C4＝-3.28720E-05

C6＝-1.08450E-08

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

[variable range]

W M T

f 16.39999 34.08159 82.99972

D1 2.44878 18.51037 38.25669

D2 22.79625 9.81033 1.20000

D3 7.40495 3.42335 1.19328

BF 37.99996 53.00295 71.99994

[value that is used for conditional expression]

(1)：f3/fw＝3.143

(2)：f3/ft＝0.621

(3)：f2/f3＝-0.270

(4)：D3W-D3T＝6.21167

(5)：f31/ft＝0.301

(6)：Bfw/fw＝2.317

(7)：f3/f4＝1.442

Figure 10 A and 10B illustrate respectively according to the zoom-lens system of the example 3 of first embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma under the focusing wide-angle side state at infinity.

Figure 11 is the curve map that illustrates according to the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 3 of first embodiment.

Figure 12 A and 12B illustrate respectively according to the zoom-lens system of the example 3 of first embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma under the focusing end state of dolly-out,ing dolly-back at infinity.

As seeing, owing to proofread and correct result well, fabulous optical property is shown according to the zoom-lens system of the example 3 of first embodiment at the various aberrations of wide-angle side state, medium focal length state and the end state of dolly-out,ing dolly-back from each curve map is clear.

Example 4

Figure 13 illustrates according to the zoom-lens system of the example 4 of first embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Zoom-lens system according to example 4 comprises according to the order from object: the first lens combination G1 with positive refractive power, the second lens combination G2 with negative refractive power, have the 3rd lens combination G3 of positive refractive power, and the 4th lens combination G4 with positive refractive power.

This first lens combination G1 comprises according to the order from object: by having the balsaming lens that constitutes towards the negative meniscus lens L11 and the biconvex positive lens L12 gummed of the nonreentrant surface of object and having towards the positive falcate L13 of the nonreentrant surface of object.

The 4th lens combination G4 comprises according to the order from object: biconvex positive lens L41 and the balsaming lens that constitutes by biconvex positive lens L42 and double-concave negative lens L43, biconvex positive lens L44 gummed, and have towards the recessed surperficial negative meniscus lens L45 of object.The negative meniscus lens L45 of close image-side is a non-spherical lens, and on these lens, the image-side surface is formed by non-ball surface.

Because this lens arrangement, in zoom-lens system according to example 4, this first lens combination G1, the 3rd lens combination G3, and the 4th lens combination G4 to movement of objects, and this second lens combination G2 also moves, and makes that the distance between this first lens combination G1 and the second lens combination G2 increases, distance between this second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 reduces.

In zoom-lens system according to example 4, when camera shake takes place, only move this rear lens group G3 along the direction that is basically perpendicular to optical axis and be embodied as the picture plane correction, in other words, realize vibration damping.

In zoom-lens system, undertaken by this second lens combination G2 is shifted to object as far as focusing near object from infinite according to example 4.

Because this lens arrangement, in zoom-lens system according to example 3, this first lens combination G1, the 3rd lens combination G3, and the 4th lens combination G4 shift to object, and this second lens combination G2 also moves, and makes that the distance between this first lens combination G1 and the second lens combination G2 increases, and the distance between this second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 reduces.

With list in the table 4 according to the relevant various values of the zoom-lens system of the example 4 of first embodiment.

Damping coefficient K is 0.951 in the wide-angle side state (W) of example 4, and focal length is 16.4 (mm), so in order to proofread and correct the rotation camera shake of 0.80 degree, the amount of movement of rear lens group G32 is 0.241 (mm).In taking the photograph far-end state (T), damping coefficient K is 1.628, and focal length is 83.0 (mm), so in order to proofread and correct the shake of the 0.35 rotation camera of spending, the amount of movement of rear lens group G32 is 0.311 (mm).

Table 4

[technical specification]

W M T

f＝ 16.4 34.3 83.0

FNO＝ 3.6 4.6 5.8

2ω＝ 86.6 45.7 19.9

[lens data]

N r d vd nd

1 236.486 2.000 25.4 1.805181

2 55.828 7.245 54.7 1.729157

3 -4442.864?0.100

4 45.771 4.666 42.7 1.834807

5 100.227 (D1)

6 ^* 493.016 0.150 38.1 1.553890

7 91.115 1.200 46.6 1.816000

8 11.518 6.160

9 -23.691 1.200 42?7 1.834807

10 59.483 0.486

11 39.039 3.453 23.8 1.846660

12 -31.030 0.886

13 -18.463 1.200 42.7 1.834807

14 -26.625 (D2)

15 ∞, 1.000 aperture diaphragm S

16 37.010 2.530 52.3 1.517420

17 -24.424 0.200

18 28.678 2.847 70.4 1.487490

19 -19.296 1.000 37.2 1.834000

20 194.798 2.500

21 ^* -31.892 0.150 38.1 1.553890

22 -30.944 1.000 42.7 1.834807

23 31.645 1.769 23.8 1.846660

24 -421.375 2.000

25 0.000 (D3)

26 28.174 4.285 65.4 1.603001

27 -59.955 0.200

28 47.345 3.338 82.5 1.497820

29 -64.036 1.200 37.2 1.834000

30 22.188 6.055 70.4 1.487490

31 -32.448 0.200

32 -55.522 1.600 46.5 1.762260

33 ^* -65.799 (BF)

[aspherical surface data]

Surface number: 6

κ＝-11.6613

C4＝4.52620E-05

C6＝-1.64780E-07

C8＝4.37200E-10

C10＝-3.49590E-13

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 21

κ＝0.3985

C4＝5.29000E-06

C6＝4.67710E-08

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 33

κ＝-20.0000

C4＝1.25?500E-05

C6＝8.20270E-08

C8＝-1.76920E-10

C10＝1.06530E-12

C12＝0.00000E+00

C14＝0.00000E+00

[variable range]

W M T

f 16.39997 34.34251 82.99967

D1 2.23196 15.92685 35.22672

D2 17.65951 7.65683 1.20000

D3 7.90062 3.27101 1.00000

BF 37.99989 53.81300 69.99968

[value that is used for conditional expression]

(1)：f3/fw＝4.609

(2)：f3/ft＝0.911

(3)：f2/f3＝-0.170

(4)：D3W-D3T＝6.90062

(5)：f31/ft＝0.378

(6)：Bfw/fw＝2.317

(7)：f3/f4＝2.462

Figure 14 A and 14B illustrate respectively according to the zoom-lens system of the example 4 of first embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma under the focusing wide-angle side state at infinity.

Figure 15 is the curve map that illustrates according to the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 4 of first embodiment.

Figure 16 A and 16B illustrate respectively according to the zoom-lens system of the example 4 of first embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma under the focusing end state of dolly-out,ing dolly-back at infinity.

As seeing, owing to proofread and correct result well, fabulous optical property is shown according to the zoom-lens system of the example 4 of first embodiment at the various aberrations of wide-angle side state, medium focal length state and the end state of dolly-out,ing dolly-back from each curve map is clear.

Example 5

Figure 17 illustrates according to the zoom-lens system of the example 5 of first embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Zoom-lens system according to example 5 comprises according to the order from object: the first lens combination G1 with positive refractive power, the second lens combination G2 with negative refractive power, have the 3rd lens combination G3 of positive refractive power, and the 4th lens combination G4 with positive refractive power.

This front lens group G31 comprises according to the order from object: by having balsaming lens and the biconvex positive lens L33 that constitutes towards the negative meniscus lens L31 and the biconvex positive lens L32 gummed of the nonreentrant surface of object.

This rear lens group G32 comprises: according to from the order of object by double-concave negative lens L34 with have the balsaming lens that constitutes towards the positive meniscus shaped lens L35 gummed of the nonreentrant surface of object.In this rear lens group G32, the double-concave negative lens of close object side is a non-spherical lens, is formed on the resin bed that puts on the object side glass surface on non-ball surface on these lens.

The 4th lens combination G4 comprises according to the order from object: biconvex positive lens L41 and the balsaming lens that constitutes by biconvex positive lens L42 and double-concave negative lens L43 gummed, and have towards the positive meniscus shaped lens L44 on the recessed surface of object.The biconvex positive lens L41 of close object side is a non-spherical lens, and on these lens, the image-side surface is formed by non-ball surface.

Because this lens arrangement, in zoom-lens system according to example 5, this first lens combination G1, the 3rd lens combination G3, and the 4th lens combination G4 to movement of objects, and this second lens combination G2 also moves, and makes that the distance between this first lens combination G1 and the second lens combination G2 increases, distance between this second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 reduces.

In zoom-lens system according to example 5, when camera shake occurring, only move this rear lens group G3 along the direction that is basically perpendicular to optical axis and be embodied as the picture plane correction, in other words, realize vibration damping.

In zoom-lens system according to example 5, from infinite as far as near the focusing of object by carrying out towards this second lens combination of movement of objects G2.

With list table 5 in according to the relevant various data of the zoom-lens system of the example 5 of first embodiment.

Damping coefficient K is 1.723 in the wide-angle side state (W) of example 5, and focal length is 16.4 (mm), so in order to proofread and correct the rotation camera shake of 0.80 degree, the amount of movement of rear lens group G32 is 0.133 (mm).In taking the photograph far-end state (T), damping coefficient K is 2.725, and focal length is 78.0 (mm), so in order to proofread and correct the shake of the 0.35 rotation camera of spending, the amount of movement of rear lens group G32 is 0.175 (mm).

Table 5

[technical specification]

W M T

f＝ 16.4 33.7 78.0

FNO＝ 3.6 4.5 5.7

2ω＝ 87.0 46.9 21.3

[lens data]

N r d vd nd

1 406.982 2.000 23.8 1.84

2 73.318 7.000 49.6 1.772500

3 -1070.277 0.100

4 50.015 4.400 42.7 1.834810

5 107.753 (D1)

6 ^* 174.688 0.150 38.1 1.553890

7 75.000 1.200 46.6 1.816000

8 12.343 7.200

9 -31.585 1.000 46.6 1.816000

10 146.318 0.100

11 39.949 4.000 23.8 1.846660

12 -39.949 0.800

13 -25.000 1.000 42.7 1.834810

14 -63.093 (D2)

15 ∞, 0.500 aperture diaphragm S

16 36.523 1.000 46.6 1.804000

17 14.071 3.200 81.6 1.497000

18 -36.295 0.100

19 21.699 2.800 81.6 1.497000

20 -30.106 3.000

21 ^* -23.784 0.100 38.1 1.553890

22 -23.784 1.000 46.6 1.816000

23 15.480 1.800 25.4 1.805180

24 90.957 2.600

25 0.000 (D3)

26 50.288 3.200 64.1 1.516800

27 -60.000 0.100 38.1 1.553890

28 ^* -50.288 2.000

29 2757.601 3.200 42.7 1.834810

30 -40.659 1.200 23.8 1.846660

31 46.525 1.600

32 -549.545 3.800 54.7 1.729160

33 -25.439 (BF)

[aspherical surface data]

Surface number: 6

κ＝1.0000

C4＝2.94640E-05

C6＝-9.5?1900E-08

C8＝2.40590E-10

C10＝-2.91650E-13

C12＝0.00000E+00

C14＝0.00000E+00

Surface number r:21

κ＝1.0000

C4＝3.67010E-05

C6＝1.21640E-07

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 28

κ＝1.0000

C4＝2.72480E-05

C6＝-1.33750E-08

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

[variable range]

W M T

f 16.40160 33.69972 77.98505

D1 2.40000 18.20000 38.20000

D2 22.30000 9.30000 1.20000

D3 7.70000 3.10000 1.00000

BF 37.99980 53.07409 70.00006

[value that is used for conditional expression]

(1)：f3/fw＝3.267

(2)：f3/ft＝0.687

(3)：f2/f3＝-0.263

(4)：D3W-D3T＝6.70000

(5)：f31/ft＝0.248

(6)：Bfw/fw＝2.317

(7)：f3/f4＝1.510

Figure 18 A and 18B illustrate respectively according to the zoom-lens system of the example 5 of first embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma under the focusing wide-angle side state at infinity.

Figure 19 is the curve map that illustrates according to the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 5 of first embodiment.

Figure 20 A and 20B illustrate respectively according to the zoom-lens system of the example 5 of first embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma under the focusing end state of dolly-out,ing dolly-back at infinity.

As seeing, owing to proofread and correct result well, fabulous optical property is shown according to the zoom-lens system of the example 5 of first embodiment at the various aberrations of wide-angle side state, medium focal length state and the end state of dolly-out,ing dolly-back from each curve map is clear.

Second embodiment

The following describes the zoom-lens system according to second embodiment, imaging device is used for the method for vibration damping and is used to change the method for focal length.

According to the zoom-lens system of second embodiment, comprise: have first lens combination of positive refractive power, have second lens combination of negative refractive power, have the 4th lens combination of positive refractive power according to order from object.When from the wide-angle side state when dolly-out,ing dolly-back end state zoom, the distance between this first lens combination and second lens combination increases, the distance between this second lens combination and the 3rd lens combination reduces, and the variable in distance between the 3rd lens combination and the 4th lens combination.According to the order from object, the 3rd lens combination comprises front lens group with positive refractive power and the rear lens group with negative refractive power.When shake takes place camera, realize vibration damping by only moving this rear lens group along the direction that is basically perpendicular to optical axis.Satisfy following conditional expression (3):

-0.275＜f2/f3＜-0.100 (3)

Because it is littler than other lenses group that the 3rd lens combination can manufacture on diameter, the 3rd lens combination is fit to be equipped with damper mechanism.Because the 3rd lens combination is made of front lens group with positive refractive power and the rear lens group with negative refractive power, and only uses this rear lens group as the vibration damping lens combination, this damper mechanism can be very compact, and the weight of vibration damping lens combination can reduce.And the power of lens of the 3rd lens combination distributes and can suitably be provided with.Therefore, when the generation camera-shake carries out vibration damping by moving this rear lens group along the direction that is basically perpendicular to this optical axis, can make the decline of optical property very little.

Conditional expression (3) has defined the suitable focal range of second lens combination with respect to the focal length of the 3rd lens combination.The expression formula (3) owing to satisfy condition, preferably can proofread and correct various aberrations, attitude spherical aberration for example, astigmatism, the curvature of field and coma, particularly at the astigmatism of wide-angle side state, the curvature of field, coma, and take the photograph the far-end state in spherical aberration, and can suppress the variation of light field bending during vibration damping, therefore can obtain high optical property.And prevent to leave optical axis by the axle outer light beam of first lens combination by the refracting power that strengthens second lens combination, preferably can spherical aberration corrector and coma, therefore can obtain high optical property.And, because the diameter of first lens combination can be very little, therefore can make the zoom-lens system compactness.Also have, die down by the refracting power that makes the 3rd lens combination, to keep the refracting power of second lens combination, and the lens number of lens combination before or after not increasing, preferably can proofread and correct various aberrations, for example spherical aberration and coma, and suppress the decline of optical property, for example variation of the coma and curvature of field during vibration damping.As a result, damper mechanism can be very very little, and because the maximum gauge of lens barrel can be little, total length of lens and total system can be very compact.

The refracting power of second lens combination dies down in limited time with less-than condition expression formula (3) following when the ratio of f2/f3 equals, therefore separating from optical axis from Axial Bundle by first lens combination.Therefore, want preferred spherical aberration corrector and coma, the coma of particularly proofreading and correct under the wide-angle state becomes very difficult.And, because the diameter of first lens combination is big, make the zoom-lens system compactness very difficult, so this is undesirable.Also have, the refracting power of the 3rd lens combination is strong owing to keep the refracting power of second lens combination, so want the preferred curvature of field when proofreading and correct the spherical aberration of taking the photograph the far-end state and vibration damping to become very difficult.In addition, because the lens number of front lens group or rear lens group becomes big, total length of lens change is big and total system is bulky, so this is undesirable.The number that particularly increases rear lens group makes damper mechanism become big, and makes the maximum gauge of lens barrel become big, so this is undesirable.

On the other hand, when the ratio of f2/f3 is equal to or greater than going up in limited time of conditional expression (3), the refracting power of second lens combination is too strong, and astigmatism and the curvature of field degenerate and become clearly, so this is undesirable.In order to ensure effect of the present invention, preferably the upper limit of conditional expression (3) is set to-0.15.

In zoom-lens system, preferably satisfy following conditional expression (8) according to second embodiment:

1.96＜f3/f31＜5.00 (8)

Wherein f3 represents the focal length of the 3rd lens combination, and f31 represents the focal length of front lens group.

Conditional expression (8) has defined the suitable focal range of the 3rd lens combination with respect to the focal length of front lens group.The expression formula (8) owing to satisfy condition preferably can spherical aberration corrector and the aberration of taking the photograph the far-end state.And can suppress the optical property that causes by various aberrations and descend, for example be freed from the eccentric caused coma that foozle produces, therefore can obtain preferred optical property.

When the ratio of f3/f31 equal with less-than condition expression formula (8) following in limited time, therefore the refracting power grow of the 3rd lens combination makes that proofreading and correct spherical aberration and the aberration of taking the photograph the far-end state becomes very difficult.In order to ensure effect of the present invention, preferably the lower limit of conditional expression (8) is set to 2.00.

On the other hand, when the ratio of f3/f31 is equal to and greater than going up in limited time of conditional expression (8), the refracting power grow of four-head lens combination makes the optical property that is caused by various aberrations descend and becomes clearly, for example the coma that causes of the off-centre that is produced by foozle.In order to ensure effect of the present invention, preferably the upper limit of conditional expression (8) is set to 4.00.

In zoom-lens system according to second embodiment, the expression formula that preferably satisfies condition (9):

-4.00＜f3/f32＜-1.20 (9)

Wherein f3 represents the focal length of the 3rd lens combination, and f32 represents the focal length of rear lens group.

Conditional expression (9) has defined the suitable focal range of the 3rd lens combination with respect to the focal length of rear lens group.Owing to satisfying condition expression formula (9), can optimize the displacement of image with respect to the displacement of vibration damping lens combination.And, can suppress by various aberrations, for example therefore the decline of the optical property that causes of the curvature of field that causes from departure during vibration damping can obtain preferred optical property.Also have, can be used in the driving mechanism compactness of vibration damping.

When being become greatly with respect to the displacement of the displacement image of vibration damping lens combination in limited time down that the ratio of f3/f32 is equal to or less than conditional expression (9), the optical property decline of the curvature of field that is caused by departure when making such as vibration damping becomes clearly.In order to ensure effect of the present invention, preferred, the lower limit of conditional expression (9) is set to-3.00.

On the other hand, when the ratio of f3/f32 is equal to or greater than going up in limited time of conditional expression (9), diminished with respect to the displacement of the displacement image of vibration damping lens combination.Therefore in order to ensure enough displacements, the driving mechanism that is used for vibration damping becomes big.And the eccentric coma when wanting preferably to proofread and correct vibration damping becomes very difficult.In order to ensure effect of the present invention, preferred, the upper limit of conditional expression (9) is set to-1.30.

In zoom-lens system, preferably satisfy following conditional expression (10) according to second embodiment:

-1.00＜f31/f32＜-0.60 (10)

Wherein f31 represents the focal length of front lens group, and f32 represents the focal length of rear lens group.

Conditional expression (10) has defined the suitable focal range of front lens group with respect to the focal length of rear lens.Owing to satisfying condition expression formula (10), can optimize the displacement of imaging plane with respect to the displacement of vibration damping lens combination.And, can suppress the optical property that the various aberrations of the curvature of field that caused by departure by such as vibration damping the time cause and descend, therefore, the optical property that can obtain to optimize.And can be used in the driving mechanism compactness of vibration damping.

With respect to the amount of movement of vibration damping lens combination, the mobile quantitative change of image is big in limited time when the ratio of f31/f32 is equal to or less than conditional expression (10) following, makes the decline of optical property of the curvature of field that departure causes such as by vibration damping the time become clearly.In order to ensure effect of the present invention, preferred, the lower limit of conditional expression (10) is set to-0.90.

On the other hand, when the ratio of f31/f32 is equal to or greater than going up in limited time of conditional expression (10), with respect to the displacement of vibration damping lens combination, the displacement of spirogram picture is diminished.Therefore, in order to ensure enough displacements, the driving mechanism that is used for vibration damping becomes big.And the eccentric coma when wanting preferably to proofread and correct vibration damping becomes very difficult.In order to ensure effect of the present invention, preferred, the upper limit of conditional expression (10) is set to-0.64.

In zoom-lens system according to second embodiment, the expression formula that preferably satisfies condition (11):

0.25＜f4/ft＜0.80 (11)

Wherein f4 represents the focal length of the 4th lens combination, and ft represents that this zoom-lens system is at the focal length of taking the photograph the far-end state.

Conditional expression (11) has defined the suitable focal range of the 4th lens combination at the focal length of taking the photograph the far-end state with respect to this zoom-lens system.Because the expression formula (11) that satisfies condition preferably can be proofreaied and correct in the spherical aberration of taking the photograph the far-end state, coma and aberration, and at the curvature of field and the coma of wide-angle side state.

Want the preferred coma of taking the photograph the far-end state of proofreading and correct simultaneously in limited time when the ratio of f4/ft is equal to or less than the following of conditional expression (11), it is very difficult that the curvature of field of wide-angle side state becomes.In order to ensure effect of the present invention, preferred, the lower limit of conditional expression (11) is set to 0.30.

On the other hand, when the ratio of f4/ft is equal to or greater than going up in limited time of conditional expression (11), total focal length of this zoom-lens system becomes big, therefore influences the purpose of compactedness.For the refracting power grow that makes the 3rd lens combination becomes the factor that the spherical aberration of taking the photograph the far-end state and aberration are degenerated to alleviate this effect.In order to ensure effect of the present invention, preferred, the upper limit of conditional expression (11) is set to 0.60.

In zoom-lens system according to second embodiment, the expression formula that preferably satisfies condition (12):

1.00＜f3/f4＜5.00 (12)

Wherein f3 represents the focal length of the 3rd lens combination, and f4 represents the focal length of the 3rd lens combination.

Conditional expression (12) has defined the suitable focal range of the 3rd lens combination with respect to the focal length of the 4th lens combination.The expression formula (12) owing to satisfy condition, can preferably proofread and correct such as the curvature of field of wide-angle side state and the off-axis aberration of coma, and the spherical aberration of taking the photograph the far-end state, coma and aberration, and back focal length is shortened, therefore can suppress to descend by the optical property that the eccentric coma that foozle causes produces.

When the ratio of f3/f4 be equal to or less than conditional expression (12) following in limited time, this back focal length shortens.Degenerate for fear of the off-axis aberration of causing under the wide-angle side state, make the refracting power of second lens combination stronger.In order to ensure effect of the present invention, preferred, the lower limit of conditional expression (12) is set to 1.20.

On the other hand, the ratio as f3/f4 is equal to or greater than the in limited time last of conditional expression (12), the refracting power grow of the 4th lens combination.Therefore proofread and correct wide-angle side and become very difficult with the coma of taking the photograph the far-end state.And.The optical property that off-centre produced that is caused by foozle now becomes clearly.In order to ensure effect of the present invention, preferred, the upper limit of conditional expression (12) is set to 4.00.

In the zoom-lens system according to second embodiment, preferred, the lens surface of the most close object side of this rear lens group is non-ball surface.Because this structure is even if rear lens group off-centre also fully suppresses degenerating of eccentric coma.

In the zoom-lens system according to second embodiment, preferably at least one aspheric surface is included in the 4th lens combination.Since this structure, the distortion that preferably can proofread and correct the wide-angle side state, the curvature of field, astigmatism, and spherical aberration and the coma of taking the photograph the far-end state.

In zoom-lens system according to second embodiment, preferred, when from the wide-angle side state when taking the photograph far-end state zoom, the distance between the 3rd lens combination and the 4th lens combination reduces.Distance between the 3rd lens combination and the 4th lens combination does not reduce, and from the wide-angle side state when taking the photograph far-end state zoom, be difficult to suppress the variation of the curvature of field.

In the zoom-lens system according to second embodiment, preferred, second lens combination moves along optical axis during focusing.Because the refracting power of second lens combination is big, this amount of movement can be very little.Therefore, total focal length of this zoom-lens system is constant big.And owing to compare with first lens combination, second lens combination is light, and the load of driving mechanism can lighten.

Imaging device according to second embodiment is equipped with above-mentioned zoom-lens system.

Therefore, can realize having the imaging device that high zoom ratios and wide visual angle are arranged of vibration-damping function.

A kind of oscillation damping method that is used to realize according to the zoom-lens system of second embodiment, according to order from object, this zoom-lens system comprises: first lens combination with positive refractive power, second lens combination with negative refractive power, the 3rd lens combination with positive refractive power, the 4th lens combination with positive refractive power, this method comprises the steps: by increasing distance between this first lens combination and second lens combination, reduce distance between this second lens combination and the 3rd lens combination, and change the distance between the 3rd lens combination and the 4th lens combination, thereby focal length is changed to the far-end state of taking the photograph from the wide-angle side state; Satisfy following conditional expression (3):

-0.275＜f2/f3＜-0.100 (3)

Wherein f2 represents the focal length of second lens combination, and f3 represents the focal length of the 3rd lens; The 3rd lens combination is provided, and according to the order from object, the 3rd lens combination comprises front lens group with positive refractive power and the rear lens group with negative refractive power; And when camera-shake takes place, by only moving the correction that this rear lens group is realized imaging plane along the direction that is basically perpendicular to optical axis.

In this way, can realize having the zoom-lens system that high zoom ratios and wide visual angle are arranged of vibration-damping function.

A kind of change is according to the method for the focal length of the zoom-lens system of first embodiment, according to order from no object, this zoom-lens system comprises: first lens combination with positive refractive power, second lens combination with negative refractive power, the 3rd lens combination with positive refractive power, the 4th lens combination with positive refractive power, this method comprises the steps: to provide the 3rd lens combination, according to order from object, the 3rd lens combination comprises front lens group with positive refractive power and the rear lens group with negative refractive power; When camera-shake takes place, by only moving the correction that this rear lens group is realized the plane of delineation along the direction that is basically perpendicular to optical axis.Satisfy following conditional expression (3):

-0.275＜f2/f3＜-0.100 (3)

Wherein f2 represents the focal length of second lens combination, and f3 represents the focal length of the 3rd lens combination; And by increasing distance between this first lens combination and second lens combination, reduce distance between this second lens combination and the 3rd lens combination, and change the distance between the 3rd lens combination and the 4th lens combination, thereby focal length is changed to the far-end state of taking the photograph from the wide-angle side state.

Below with reference to the zoom-lens system of description of drawings according to second embodiment.

Example 6

Fig. 1 illustrates according to the zoom-lens system of the example 6 of second embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Zoom-lens system according to example 6, comprise according to order: the first lens combination G1 with positive refractive power from object, the second lens combination G2 with negative refractive power has the 3rd lens combination G3 of positive refractive power, and the 4th lens combination G4 with positive refractive power.

This front lens group G31 comprises according to the order from object: have towards the positive meniscus shaped lens L31 in the recessed surface of object and by biconvex positive lens L32 with have towards object the balsaming lens that constitutes of the negative meniscus lens L33 gummed on recessed surface.

In the zoom-lens system according to example 6, aperture diaphragm S is arranged near the object side of the 3rd lens combination G3, and when moving with the 3rd lens combination G3 is whole when taking the photograph far-end state zoom from the wide-angle side state.

Because this lens arrangement, in zoom-lens system according to example 6, this first lens combination G1, the 3rd lens combination G3, and the 4th lens combination G4 to movement of objects, and this second lens combination G2 also moves, and makes that the distance between this first lens combination G1 and the second lens combination G2 increases, distance between this second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 reduces.

In zoom-lens system according to example 6, when camera shake takes place, only move this rear lens group G3 along the direction that is basically perpendicular to optical axis and be embodied as the picture plane correction, in other words, realize vibration damping.

In zoom-lens system according to example 6, from infinite as far as near the focusing of object by carrying out towards this second lens combination of movement of objects G2.

With list in table 6 according to the relevant various data of the zoom-lens system of the example 6 of second embodiment.

In the wide-angle side state (W) of example 6, damping coefficient K is 1.102, and focal length is 16.4 (mm), so for the rotation camera shake of school 0.80 degree, the amount of movement of rear lens group G32 is 0.208 (mm).In taking the photograph far-end state (T), damping coefficient K is 1.800, and focal length is 83.0 (mm), so in order to proofread and correct the shake of the 0.35 rotation camera of spending, the amount of movement of rear lens group G32 is 0.282 (mm).

Table 6

[technical specification]

W M T

f＝ 16.4 24.2 83.0

FNO＝ 3.6 4.5 5.7

2ω＝ 86.7 62.4 19.9

[lens data]

N r d vd nd

1 171.726 2.000 23.8 1.846660

2 58.558 6.221 49.6 1.772499

3 826.359 0.100

4 46.796 4.360 46.6 1.804000

5 102.445 (D1)

6 ^* 372.183 0.200 38.1 1.553890

7 93.131 1.200 42.7 1.834807

8 11.766 6.314

9 -27.242 1.200 42.7 1.834807

10 47.860 0.490

11 34.246 3.715 23.8 1.846660

12 -26.693 0.635

13 -19.148 1.200 37.2 1.834000

14 -39.779 (D2)

15 ∞, 1.000 aperture diaphragm S

16 -425.372 2.224 70.4 1.487490

17 -19.527 0.100

18 18.849 3.279 70.4 1.487490

19 -22.378 1.000 40.8 1.882997

20 -117.992 2.500

21 ^* -28.515 0.150 38.1 1.553890

22 -30.597 1.000 42.7 1.834807

23 19.080 2.431 28.5 1.728250

24 -100.146 2.000

25 0.000 (D3)

26 32.711 4.269 23.8 1.846660

27 19.344 7.251 82.5 1.497820

28 -28.413 0.200

29 -197.723 3.007 82.5 1.497820

30 -31.076 2.000 46.6 1.766098

31 ^* -54.725 (BF)

[aspherical surface data]

Surface number: 6

κ＝17.1808

C4＝4.07840E-05

C6＝-1.47070E-07

C8＝1.73490E-10

C10＝3.50610E-12

C12＝-0.24029E-13

C14＝0.51556E-16

Surface label: 21

κ＝2.7193

C4＝3.17430E-05

C6＝8.22330E-08

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 31

κ＝6.4334

C4＝1.65030E-05

C6＝-5.27060E-09

C8＝5.36500E-10

C10＝-5.29690E-12

C12＝0.20134E-13

C14＝-0.18195E-16

[variable range]

W M T

f 16.39999 24.19997 82.99980

D1 2.17905 9.29038 35.23893

D2 19.76656 12.67294 1.20078

D3 7.69778 4.92538 1.00000

BF 38.57713 47.10464 73.28825

[value that is used for conditional expression]

(3)：f2/f3＝-0.24

(8)：f3/f31＝2.06

(9)：f3/f32＝-1.35

(10)：f31/f32＝-0.66

(11)：f4/ft＝0.45

(12)：f3/f4＝1.361

Fig. 2 A and 2B illustrate respectively according to the zoom-lens system of the example 6 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma under the focusing wide-angle side state at infinity.

Fig. 3 is the curve map that illustrates according to the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 6 of second embodiment.

It is curve map at various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and coma under the focusing end state of dolly-out,ing dolly-back at infinity that Fig. 4 A and 4B illustrate according to the zoom-lens system of the example 6 of second embodiment respectively.

As seeing, owing to proofread and correct result well, fabulous optical property is shown according to the zoom lens system of the example 6 of first embodiment at the various aberrations of wide-angle side state, medium focal length state and the end state of dolly-out,ing dolly-back from each curve map is clear.

Example 7

Zoom-lens system according to example 7, comprise according to order: the first lens combination G1 with positive refractive power from object, the second lens combination G2 with negative refractive power has the 3rd lens combination G3 of positive refractive power, and the 4th lens combination G4 with positive refractive power.

This front lens group G31 comprises according to the order from object: by have the balsaming lens that constitutes towards the nonreentrant surface negative meniscus lens L31 of object and biconvex positive lens L32 gummed and by the biconvex positive lens with have the balsaming lens that constitutes towards the negative meniscus lens L34 gummed on the recessed surface of object.

This rear lens group G32 comprises: glue together the balsaming lens that constitutes according to the order from object by double-concave negative lens L35 and biconvex positive lens L36.In this rear lens group G32, the double-concave negative lens L35 of close object side is a non-spherical lens, is formed on the resin bed that puts on the object side glass surface on non-ball surface on these lens.

The 4th lens combination G4 comprises according to the order from object: by having the balsaming lens that constitutes towards the negative meniscus lens L41 and the biconvex positive lens L42 gummed of the nonreentrant surface of object, and by have towards the positive meniscus shaped lens L43 in the recessed surface of object with have the balsaming lens that constitutes towards the negative meniscus lens L44 gummed on the recessed surface of object.The negative meniscus lens L44 of close image-side is a non-spherical lens, and on these lens, the image-side surface is formed by aspheric surface.

In the zoom-lens system according to example 7, aperture diaphragm S is arranged near the object side of the 3rd lens combination G3, and when moving with the 3rd lens combination G3 is whole when taking the photograph far-end state zoom from the wide-angle side state.

Because this lens arrangement, in zoom-lens system according to example 7, this first lens combination G1, the 3rd lens combination G3, and the 4th lens combination G4 to movement of objects, and this second lens combination G2 also moves, and makes that the distance between this first lens combination G1 and the second lens combination G2 increases, distance between this second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 reduces.

In zoom-lens system according to example 7, when camera shake takes place, only move this rear lens group G3 along the direction that is basically perpendicular to optical axis and be embodied as the picture plane correction, that is, realize vibration damping.

In zoom-lens system according to example 7, from infinite as far as near the focusing of object by carrying out towards this second lens combination of movement of objects G2.

With list in table 7 according to the relevant various data of the zoom-lens system of the example 7 of second embodiment.

In the wide-angle side state (W) of example 7, damping coefficient K is 1.21, and focal length is 16.4 (mm), so in order to proofread and correct the rotation camera shake of 0.80 degree, the amount of movement of rear lens group G32 is 0.189 (mm).In taking the photograph far-end state (T), damping coefficient K is 2.00, and focal length is 83.0 (mm), so in order to proofread and correct the rotation camera shake of 0.35 degree, the amount of movement of rear lens group G32 is 0.254 (mm).

Table 7

[technical specification]

W M T

f＝ 16.4 49.7 83.0

FNO＝ 3.6 5.1 5.9

2ω＝ 86.1 32.4 19.7

[lens data]

N r d vd nd

1 178.090 2.000 23.8 1.846660

2 60.522 6.400 54.7 1.729160

3 1137.758 0.100

4 47.662 4.600 46.6 1.816000

5 119.666 (D1)

6 ^* 117.433 0.200 38.1 1.553890

7 83.348 1.300 42.7 1.834810

8 11.081 5.700

9 -33.721 1.100 42.7 1.834810

10 33.720 0.300

11 24.477 4.400 23.8 1.846660

12 -30.369 0.35

13 -23.792 1.000 42.7 1.834810

14 -100.517 (D2)

15 ∞, 0.800 aperture diaphragm S

16 377.103 0.800 46.6 1.816000

17 30.946 3.300 45.8 1.548140

18 -18.550 0.100

19 17.209 3.700 70.5 1.487490

20 -24.710 0.800 23.8 1.846660

21 -210.399 2.500

22 ^* -26.783 0.150 38.1 1.553890

23 -29.474 1.000 42.7 1.834810

24 17.559 2.700 25.7 1.784720

25 -246.459 2.000

26 0.000 (D3)

27 33.026 4.000 23.8 1.846660

28 21.336 7.300 82.6 1.497820

29 -27.809 0.200

30 -180.038 3.100 82.6 1.497820

31 -30.995 2.000 46.6 1.766100

32 ^* -55.799 (BF)

[aspherical surface data]

Surface label: 6

κ＝-12.4527

C4＝2.11940E-05

C6＝-8.06850E-07

C8＝-8.44290E-09

C10＝6.67410E-12

C12＝-0.22943E-13

C14＝0.29315E-14

Surface number: 22

κ＝-0.2262

C4＝1.51570E-06

C6＝6.22150E-08

C8＝-6.46789E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 32

κ＝4.7449

C4＝1.65360E-05

C6＝2.53690E-08

C8＝2.12430E-10

C10＝-3.73200E-12

C12＝0.25824E-13

C14＝-0.63802E-14

[variable range]

W M T

f 16.40023 49.65066 83.00449

D1 2.10299 24.28979 34.38071

D2 19.13089 5.62790 1.90055

D3 8.15512 1.92897 1.02055

BF 38.63509 62.87426 73.22168

[value that is used for conditional expression]

(3)：f2/f3＝-0.24

(8)：f3/f31＝2.13

(9)：f3/f32＝-1.48

(10)：f31/f32＝-0.70

(11)：f4/ft＝0.43

(12)：f3/f4＝1.38

Figure 24 A and 246B illustrate respectively according to the zoom-lens system of the example 7 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma under the focusing end state of dolly-out,ing dolly-back at infinity.

As seeing, owing to proofread and correct result well, fabulous optical property is shown according to the zoom lens system of the example 7 of second embodiment at the various aberrations of wide-angle side state, medium focal length state and the end state of dolly-out,ing dolly-back from each curve map is clear.

Example 8

Fig. 5 illustrates according to the zoom-lens system of the example 8 of second embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Zoom-lens system according to example 8 comprises according to the order from object: the first lens combination G1 with positive refractive power, the second lens combination G2 with negative refractive power, have the 3rd lens combination G3 of positive refractive power, and the 4th lens combination G4 with positive refractive power.

In the zoom-lens system according to example 8, aperture diaphragm S is arranged near the object side of the 3rd lens combination G3, and when moving with the 3rd lens combination G3 is whole when taking the photograph far-end state zoom from the wide-angle side state.

Because this lens arrangement, in zoom-lens system according to example 8, this first lens combination G1, the 3rd lens combination G3, and the 4th lens combination G4 to movement of objects, and this second lens combination G2 also moves, and makes that the distance between this first lens combination G1 and the second lens combination G2 increases, distance between this second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 reduces.

In zoom-lens system according to example 8, when camera shake takes place, only move this rear lens group G3 along the direction that is basically perpendicular to optical axis and be embodied as the picture plane correction, that is, realize vibration damping.

In zoom-lens system according to example 8, from infinite as far as near the focusing of object by carrying out towards this second lens combination of movement of objects G2.

With list in the table 8 according to the relevant various data of the zoom-lens system of the example 8 of second embodiment.

In the wide-angle side state (W) of example 8, damping coefficient K is 0.880, and focal length is 16.4 (mm), so in order to proofread and correct the rotation camera shake of 0.80 degree, the amount of movement of rear lens group G32 is 0.260 (mm).In taking the photograph far-end state (T), damping coefficient K is 1.500, and focal length is 83.0 (mm), so in order to proofread and correct the camera shake of 0.35 rotation of spending, the amount of movement of rear lens group G32 is 0.338 (mm).

Table 8

[technical specification]

W M T

f＝ 16.4 33.9 83.0

FNO＝ 3.6 4.5 5.7

2ω＝ 86.5 46.4 20.0

[lens data]

N r d vd nd

1 186.010 2.000 23.8 1.846660

2 57.108 6.824 52.3 1.754998

3 1445.904 0.100

4 44.873 4.642 42.7 1.834807

5 94.419 (D1)

6 ^* 520.086 0.150 38.1 1.553890

7 85.835 1.200 46.6 1.816000

8 11.870 6.042

9 -25.454 1.200 42.7 1.834807

10 55.451 0.539

11 39.367 3.574 23.8 1.846660

12 -27.649 0.744

13 -18.401 1.200 42.7 1.834807

14 -34.541 (D2)

15 ∞, 1.000 aperture diaphragm S

16 32.804 2.550 52.3 1.517420

17 -25.691 0.200

18 33.873 2.784 82.5 1.497820

19 -18.357 1.000 42.7 1.834807

20 2477.502 2.500

21 ^* -32.917 0.150 38.1 1.553890

22 -33.614 1.000 42.7 1.834807

23 43.144 1.625 23.8 1.846660

24 -346.476 2.000

25 0.000 (D3)

26 23.264 4.823 70.0 1.518601

27 -78.743 0.200

28 74.714 1.360 32.4 1.850260

29 22.000 6.579 82.5 1.497820

30 -26.508 0.412

31 -34.173 1.600 46.5 1.762260

32 ^* -58.732 (BF)

[aspherical surface data]

Surface number: 6

κ＝-2.1764

C4＝4.70240E-05

C6＝-2.04990E-07

C8＝1.13690E-09

C10＝-4.83300E-12

C12＝0.10986E-13

C14＝0.00000E+00

Surface number: 21

κ＝-1.4217

C4＝-1.31640E-06

C6＝5.43730E-08

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 32

κ＝5.7116

C4＝3.09920E-05

C6＝2.85680E-08

C8＝9.03240E-10

C10＝-7.28720E-12

C12＝0.29235E-13

C14＝0.00000E+00

[variable range s]

W M T

f 16.39998 33.91908 82.99980

D1 2.13822 16.04163 34.70001

D2 16.95004 7.51901 1.20000

D3 7.82663 3.50000 1.00000

BF 37.99995 53.02618 70.00001

[value that is used for conditional expression]

(3)：f2/f3＝-0.19

(8)：f3/f31＝2.10

(9)：f3/f32＝-1.41

(10)：f31/f32＝-0.67

(11)：f4/ft＝0.38

(12)：f3/f4＝2.01

Fig. 6 A and 6B illustrate zoom-lens system according to the example 8 of second embodiment respectively under focusing wide-angle side state at infinity, the various aberrations when the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma.

Fig. 7 is the curve map that illustrates according to the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 8 of second embodiment.

Fig. 8 A and 8B illustrate zoom-lens system according to the example 8 of second embodiment respectively under the focusing end state of dolly-out,ing dolly-back at infinity, the various aberrations when the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma.

As seeing, owing to proofread and correct result well, fabulous optical property is shown according to the zoom lens system of the example 8 of second embodiment at the various aberrations of wide-angle side state, medium focal length state and the end state of dolly-out,ing dolly-back from each curve map is clear.

Example 9

Fig. 9 illustrates according to the zoom-lens system of the example 9 of second embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Zoom-lens system according to example 9 comprises according to the order from object: the first lens combination G1 with positive refractive power, the second lens combination G2 with negative refractive power, have the 3rd lens combination G3 of positive refractive power, and the 4th lens combination G4 with positive refractive power.

In the zoom-lens system according to example 9, aperture diaphragm S is arranged near the object side of the 3rd lens combination G3, and when moving with the 3rd lens combination G3 is whole when taking the photograph far-end state zoom from the wide-angle side state.

Because this lens arrangement, in zoom-lens system according to example 9, this first lens combination G1, the 3rd lens combination G3, and the 4th lens combination G4 to movement of objects, and this second lens combination G2 also moves, and makes that the distance between this first lens combination G1 and the second lens combination G2 increases, distance between this second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 reduces.

In zoom-lens system according to example 9, when camera shake takes place, only move this rear lens group G3 along the direction that is basically perpendicular to optical axis and be embodied as the picture plane correction, that is, realize vibration damping.

In zoom-lens system according to example 9, from infinite as far as near the focusing of object by carrying out towards this second lens combination of movement of objects G2.

With list in the table 9 according to the relevant various values of the zoom-lens system of the example 9 of second embodiment.

In the wide-angle side state (W) of example 9, damping coefficient K is 1.104, and focal length is 16.4 (mm), so in order to proofread and correct the rotation camera shake of 0.80 degree, the amount of movement of rear lens group G32 is 0.207 (mm).In taking the photograph far-end state (T), damping coefficient K is 1.819, and focal length is 83.0 (mm), so in order to proofread and correct the shake of the 0.35 rotation camera of spending, the amount of movement of rear lens group G32 is 0.279 (mm).

Table 9

[technical specification]

W M T

f＝ 16.4 34.1 83.0

FNO＝ 3.6 4.4 5.4

2ω＝ 87.5 47.0 20.3

[lens data]

N r d vd nd

1 269.486 2.000 23.8 1.846660

2 67.239 7.217 49.6 1.772499

3 22008.798 0.100

4 49.607 4.504 42.7 1.834807

5 105.112 (D1)

6 ^* 262.081 0.150 38.1 1.553890

7 95.557 1.200 46.6 1.816000

8 12.537 7.088

9 -31.137 1.200 46.6 1.804000

10 56.257 0.100

11 36.553 3.806 23.8 1.846660

12 -40.735 0.704

13 -25.479 1.200 42.7 1.834807

14 -45.309 (D2)

15 ∞, 1.000 aperture diaphragm S

16 29.426 2.685 70.4 1.487490

17 -26.404 0.200

18 25.849 2.916 82.5 1.497820

19 -21.717 1.000 42.7 1.834807

20 -2212.439 2.500

21 ^* -36.151 0.100 38.1 1.553890

22 -34.195 1.000 46.6 1.816000

23 21.952 1.776 25.4 1.805181

24 171.806 2.000

25 0.000 (D3)

26 ^* -261.293 2.565 61.1 1.589130

27 -31.706 0.200

28 39.431 2.991 82.5 1.497820

29 -123.144 1.248 23.8 1.846660

30 48.841 2.165

31 -69.810 3.425 65.4 1.603001

32 -21.259 (BF)

[aspherical surface data]

Surface number: 6

κ＝1.0000

C4＝2.75610E-05

C6＝-7.17460E-08

C8＝1.32080E-10

C10＝-1.28130E-13

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 21

κ＝1.5000

C4＝1.52920E-05

C6＝3.43650E-08

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

Surface label: 26

κ＝9.9454

C4＝-3.28720E-05

C6＝-1.08450E-08

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

[variable range]

W M T

f 16.39999 34.08159 82.99972

D1 2.44878 18.51037 38.25669

D2 22.79625 9.81033 1.20000

D3 7.40495 3.42335 1.19328

BF 37.99996 53.00295 71.99994

[value that is used for conditional expression]

(3)：f2/f3＝-0.27

(8)：f3/f31＝2.06

(9)：f3/f32＝-1.46

(10)：f31/f32＝-0.71

(11)：f4/ft＝0.43

(12)：f3/f4＝1.44

Figure 10 A and 10B illustrate respectively according to the zoom-lens system of the example 9 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma under the focusing wide-angle side state at infinity.

Figure 11 is the curve map that illustrates according to the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 9 of second embodiment.

Figure 12 A and 12B illustrate respectively according to the zoom-lens system of the example 9 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma under the focusing end state of dolly-out,ing dolly-back at infinity.

As seeing, owing to proofread and correct result well, fabulous optical property is shown according to the zoom-lens system of the example 9 of second embodiment at the various aberrations of wide-angle side state, medium focal length state and the end state of dolly-out,ing dolly-back from each curve map is clear.

Example 10

Figure 13 illustrates according to the zoom-lens system of the example 10 of second embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Zoom-lens system according to example 10 comprises according to the order from object: the first lens combination G1 with positive refractive power, the second lens combination G2 with negative refractive power, have the 3rd lens combination G3 of positive refractive power, and the 4th lens combination G4 with positive refractive power.

In the zoom-lens system according to example 10, aperture diaphragm S is arranged near the object side of the 3rd lens combination G3, and when moving with the 3rd lens combination G3 is whole when taking the photograph far-end state zoom from the wide-angle side state.

Because this lens arrangement, in zoom-lens system according to example 10, this first lens combination G1, the 3rd lens combination G3, and the 4th lens combination G4 to movement of objects, and this second lens combination G2 also moves, and makes that the distance between this first lens combination G1 and the second lens combination G2 increases, distance between this second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 reduces.

In zoom-lens system according to example 10, when camera shake takes place, only move this rear lens group G3 along the direction that is basically perpendicular to optical axis and be embodied as the picture plane correction, that is, realize vibration damping.

In zoom-lens system according to example 10, from infinite as far as near the focusing of object by carrying out towards this second lens combination of movement of objects G2.

With list in table 4 according to the relevant various values of the zoom-lens system of the example 10 of second embodiment.

In the wide-angle side state (W) of example 10, damping coefficient K is 0.951, and focal length is 16.4 (mm), so in order to proofread and correct the rotation camera shake of 0.80 degree, the amount of movement of rear lens group G32 is 0.241 (mm).In taking the photograph far-end state (T), damping coefficient K is 1.628, and focal length is 83.0 (mm), so in order to proofread and correct the rotation camera shake of 0.35 degree, the amount of movement of rear lens group G32 is 0.311 (mm).

Table 10

[technical specification]

W M T

f＝ 16.4 34.3 83.0

FNO＝ 3.6 4.6 5.8

2ω＝ 86.6 45.7 19.9

[lens data]

N r d vd nd

1 236.486 2.000 25.4 1.805181

2 55.828 7.245 54.7 1.729157

3 -4442.864 0.100

4 45.771 4.666 42.7 1.834807

5 100.227 (D1)

6 ^* 493.016 0.150 38.1 1.553890

7 91.115 1.200 46.6 1.816000

8 11.518 6.160

9 -23.691 1.200 42.7 1.834807

10 59.483 0.486

11 39.039 3.453 23.8 1.846660

12 -31.030 0.886

13 -18.463 1.200 42.7 1.834807

14 -26.625 (D2)

15 ∞, 1.000 aperture diaphragm S

16 37.010 2.530 52.3 1.517420

17 -24.424 0.200

18 28.678 2.847 70.4 1.487490

19 -19.296 1.000 37.2 1.834000

20 194.798 2.500

21 ^* -31.892 0.150 38.1 1.553890

22 -30.944 1.000 42.7 1.834807

23 31.645 1.769 23.8 1.846660

24 -421.375 2.000

25 0.000 (D3)

26 28.174 4.285 65.4 1.603001

27 -59.955 0.200

28 47.345 3.338 82.5 1.497820

29 -64.036 1.200 37.2 1.834000

30 22.188 6.055 70.4 1.487490

31 -32.448 0.200

32 -55.522 1.600 46.5 1.762260

33 ^* -65.799 (BF)

[aspherical surface data]

Surface number: 6

κ＝-11.6613

C4＝4.52620E-05

C6＝-1.64780E-07

C8＝4.37200E-10

C10＝-3.49590E-13

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 21

κ＝0.3985

C4＝5.29000E-06

C6＝4.67710E-08

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 33

κ＝-20.0000

C4＝1.25500E-05

C6＝8.20270E-08

C8＝-1.76920E-10

C10＝1.06530E-12

C12＝0.00000E+00

C14＝0.00000E+00

[variable range]

W M T

f 16.39997 34.34251 82.99967

D1 2.23196 15.92685 35.22672

D2 17.65951 7.65683 1.20000

D3 7.90062 3.27101 1.00000

BF 37.99989 53.81300 69.99968

[value that is used for conditional expression]

(3)：f2/f3＝-0.17

(8)：f3/f31＝2.41

(9)：f3/f32＝-1.81

(10)：f31/f32＝-0.75

(11)：f4/ft＝0.37

(12)：f3/f4＝2.46

Figure 14 A and 14B illustrate zoom-lens system according to the example 10 of second embodiment respectively under focusing wide-angle side state at infinity, the various aberrations when the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma.

Figure 15 illustrates according to the zoom-lens system of the example 10 of second embodiment with according to the curve map of the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 10 of second embodiment.

Figure 16 A and 16B illustrate zoom-lens system according to the example 10 of second embodiment respectively under the focusing end state of dolly-out,ing dolly-back at infinity, the various aberrations when the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma.

As seeing, owing to proofread and correct result well, fabulous optical property is shown according to the zoom-lens system of the example 10 of second embodiment at the various aberrations of wide-angle side state, medium focal length state and the end state of dolly-out,ing dolly-back from each curve map is clear.

Example 11

Figure 17 illustrates according to the zoom-lens system of the example 11 of second embodiment synoptic diagram with the lens arrangement of the zoom track of each lens combination.

Zoom-lens system according to example 11 comprises according to the order from object: the first lens combination G1 with positive refractive power, the second lens combination G2 with negative refractive power, have the 3rd lens combination G3 of positive refractive power, and the 4th lens combination G4 with positive refractive power.

In the zoom-lens system according to example 11, aperture diaphragm S is arranged near the object side of the 3rd lens combination G3, and when moving with the 3rd lens combination G3 is whole when taking the photograph far-end state zoom from the wide-angle side state.

Because this lens arrangement, in zoom-lens system according to example 11, this first lens combination G1, the 3rd lens combination G3, and the 4th lens combination G4 to movement of objects, and this second lens combination G2 also moves, and makes that the distance between this first lens combination G1 and the second lens combination G2 increases, distance between this second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 reduces.

In zoom-lens system according to example 11, when camera shake takes place, only move this rear lens group G32 along the direction that is basically perpendicular to optical axis and be embodied as the picture plane correction, that is, realize vibration damping.

In zoom-lens system according to example 11, from infinite as far as near the focusing of object by carrying out towards this second lens combination of movement of objects G2.

With list table 11 in according to the relevant various data of the zoom-lens system of the example 11 of second embodiment.

In the wide-angle side state (W) of example 11, damping coefficient K is 1.723, and focal length is 16.4 (mm), so in order to proofread and correct the rotation camera shake of 0.80 degree, the amount of movement of rear lens group G32 is 0.133 (mm).In taking the photograph far-end state (T), damping coefficient K is 2.725, and focal length is 78.0 (mm), so, being used for the positive 0.35 rotation camera shake of spending, the amount of movement of rear lens group G32 is 0.175 (mm).

Table 11

[technical specification]

W M T

f＝ 16.4 33.7 78.0

FNO＝ 3.6 4.5 5.7

2ω＝ 87.0 46.9 21.3

[lens data]

N r d vd nd

1 406.982 2.000 23.8 1.846660

2 73.318 7.000 49.6 1.772500

3 -1070.277 0.100

4 50.015 4.400 42.7 1.834810

5 107.753 (D1)

6 ^* 174.688 0.150 38.1 1.553890

7 75.000 1.200 46.6 1.816000

8 12.343 7.200

9 -31.585 1.000 46.6 1.816000

10 146.318 0.100

11 39.949 4.000 23.8 1.846660

12 -39.949 0.800

13 -25.000 1.000 42.7 1.834810

14 -63.093 (D2)

15 ∞, 0.500 aperture diaphragm S

16 36.523 1.000 46.6 1.804000

17 14.071 3.200 81.6 1.497000

18 -36.295 0.100

19 21.699 2.800 81.6 1.497000

20 -30.106 3.000

21 ^* -23.784 0.100 38.1 1.553890

22 -23.784 1.000 46.6 1.816000

23 15.480 1.800 25.4 1.805180

24 90.957 2.600

25 0.000 (D3)

26 50.288 3.200 64.1 1.516800

27 -60.000 0.100 38.1 1.553890

28 ^* -50.288 2.000

29 2757.601 3.200 42.7 1.834810

30 -40.659 1.200 23.8 1.846660

31 46.525 1.600

32 -549.545 3.800 54.7 1.729160

33 -25.439 (BF)

[aspherical surface data]

Surface number: 6

κ＝1.0000

C4＝2.94640E-05

C6＝-9.5?1900E-08

C8＝2.40590E-10

C10＝-2.91650E-13

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 21

κ＝1.0000

C4＝3.67010E-05

C6＝1.21640E-07

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

Surface number: 28

κ＝1.0000

C4＝2.72480E-05

C6＝-1.33750E-08

C8＝0.00000E+00

C10＝0.00000E+00

C12＝0.00000E+00

C14＝0.00000E+00

[variable range]

W M T

f 16.40160 33.69972 77.98505

D1 2.40000 18.20000 38.20000

D2 22.30000 9.30000 1.20000

D3 7.70000 3.10000 1.00000

BF 37.99980 53.07409 70.00006

[with because the value of conditional expression]

(3)：f2/f3＝-0.26

(8)：f3/f31＝2.77

(9)：f3/f32＝-1.81

(10)：f31/f32＝-0.86

(11)：f4/ft＝0.45

(12)：f3/f4＝1.51

Figure 18 A and 18B illustrate zoom-lens system according to the example 11 of second embodiment respectively under focusing wide-angle side state at infinity, the various aberrations when the rotation indistinctness of proofreading and correct 0.80 ° and the curve map of coma.

Figure 19 is the curve map that illustrates according to the various aberrations of zoom-lens system under focusing medium focal length state at infinity of the example 11 of second embodiment.

Figure 20 A and 20B illustrate respectively according to the zoom-lens system of the example 11 of second embodiment at the various aberrations during in the rotation indistinctness of proofreading and correct 0.35 ° and the curve map of coma under the focusing end state of dolly-out,ing dolly-back at infinity.

As seeing, owing to proofread and correct result well, fabulous optical property is shown according to the zoom-lens system of the example 11 of second embodiment at the various aberrations of wide-angle side state, medium focal length state and the end state of dolly-out,ing dolly-back from each curve map is clear.

As mentioned above, each embodiment makes it possible to provide the zoom-lens system with vibration-damping function, and it has about 5 high zoom ratios, 85 degree or above wide visual angles under the wide-angle side state, and the long back focal length that is used for the single-lens reflex digital camera.

Though each example as the application illustrates the zoom-lens system with four groups of lens arrangements, be not limited thereto according to the application's lens arrangement, for example the other lenses structure of five groups of lens also is possible.

In each example of two embodiment, for from infinite focusing as far as near object, can be along the part of optical axis mobile lens group, single lens combination, or a plurality of lens combination.Focusing lens group can be used for automatic focusing, and is fit to by the motor driven such as ultrasonic motor.In the zoom-lens system according to each example, preferred second lens combination or first lens combination are as focusing lens group.

In each lens combination that constitutes according to zoom-lens system of the present invention, any lens surface can be non-ball surface.Glass molding technology or resin material that this non-ball surface can use fine grinding technology, glass material to form aspherical shape in mould form aspheric combination process manufacturing on glass surface.

In the zoom-lens system of each example, the antireflecting coating that has high-transmission rate in wide wavelength coverage can put on each lens surface, to reduce dazzle or ghost (ghost image), the high optical property that makes it possible to obtain to have high-contrast.

Above-mentioned each example of the application only illustrates concrete example, therefore the invention is not restricted to this.

Then, below with reference to Figure 25 the camera that is equipped with according to the application's zoom-lens system is described.

As shown in figure 25, this camera 1 is the single-lens reflex digital camera as the zoom-lens system of phtographic lens 2 that is equipped with according to the application.

In camera 1, the light (not shown) that sends from object is converged by viewing lens 2 and focuses on focusing screen 4 through fast return reflective mirror 3.The image that focuses on the focusing glass 4 is reflected repeatedly by pentagon roof prism 5, and guides to eyepiece 6.Therefore, the cameraman can see image as erect image by eyepiece 6.

When the cameraman pushed the shutter release button (not shown), this fast return reflective mirror 3 was removed from light path, and arrived imaging device 7 from the light (not shown) of object.Light from object is caught by this imaging device 7, and leaves in the storer (not shown) as image, and by this way, the cameraman can take a picture by enough cameras 1.

The zoom-lens system according to the example 1 of first embodiment that is connected in this camera 1 as viewing lens 2 can be realized anti-shake vibration-damping function by means of the specific lens structure, has high zoom ratios and wide visual angle.Therefore, camera 1 can be realized vibration-damping function, has high zoom ratios and wide visual angle.

The application is not limited thereto, and much less, can obtain same effect by being equipped with to have according to the application's example 2 to the camera of any one zoom-lens system of example 11.

As mentioned above, the application makes it possible to provide the zoom-lens system with vibration-damping function, high zoom ratios and wide visual angle, and the method that the method for zoom-lens system, vibration damping is provided and is used to change focal length.

For the ordinary skill in the art, be easy to realize additional advantage and modification.Therefore its broad aspect the invention is not restricted to here shown in and detail, the representational device described.Therefore under situation about not breaking away from, can carry out various modifications by the spirit of claim and total inventive concept that equivalent limited thereof and scope.

Claims

1. zoom-lens system comprises according to the order from object:

First lens combination with positive refractive power;

Second lens combination with negative refractive power;

The 3rd lens combination with positive refractive power; With

The 4th lens combination with positive refractive power;

When from the wide-angle side state when dolly-out,ing dolly-back end state zoom, the distance between this first lens combination and second lens combination changes, the distance between this second lens combination and the 3rd lens combination changes, and the distance between the 3rd lens combination and the 4th lens combination changes;

According to the order from object, the 3rd lens combination comprises front lens group with positive refractive power and the rear lens group with negative refractive power;

Wherein, this rear lens group is movably along the direction that is basically perpendicular to optical axis, and satisfies following conditional expression:

2.95＜f3/fw＜8.0

2. zoom-lens system according to claim 1, wherein when from the wide-angle side state when dolly-out,ing dolly-back end state zoom, the distance between this first lens combination and second lens combination increases, the distance between this second lens combination and the 3rd lens combination reduces.

3. zoom-lens system according to claim 1, wherein satisfy following conditional expression:

0.56＜f3/ft＜2.0

Wherein f3 represents the focal length of the 3rd lens combination, and ft represents that this zoom-lens system is at the focal length of end state of dolly-out,ing dolly-back.

4. zoom-lens system according to claim 1, wherein satisfy following conditional expression:

-0.275＜f2/f3＜-0.100

5. zoom-lens system according to claim 1, wherein when from the wide-angle side state when dolly-out,ing dolly-back end state zoom, this first lens combination, the 3rd lens combination and the 4th lens combination are towards movement of objects.

6. zoom-lens system according to claim 1, wherein satisfy following conditional expression (4):

0＜D3W-D3T

Wherein D3W is illustrated in the distance between the 3rd lens combination and the 4th lens combination under the wide-angle side state, and D3T takes the photograph the distance between the 3rd lens combination and the 4th lens combination under the far-end state being illustrated in.

7. zoom-lens system according to claim 1, wherein satisfy following conditional expression:

0.24＜f31/ft＜0.41

8. zoom-lens system according to claim 1, wherein satisfy following conditional expression:

2.15＜Bfw/fw＜3.50

9. zoom-lens system according to claim 1, expression formula wherein satisfies condition:

1.4＜f3/f4＜5.0

10. zoom-lens system according to claim 1, wherein this rear lens group the lens surface of close object side be non-ball surface.

11. zoom-lens system according to claim 1, wherein at least one non-ball surface is included in this rear lens group.

12. zoom-lens system according to claim 1, wherein at least one non-ball surface is included in the 4th lens combination.

13. zoom-lens system according to claim 1 is wherein focused by move second lens combination along optical axis.

14. an imaging device is equipped with according to claim 1 any one zoom lens group to the claim 13.

15. method that is used to change the focal length of zoom-lens system, according to order from object, this zoom-lens system comprises: first lens combination with positive refractive power, second lens combination with negative refractive power, the 3rd lens combination with positive refractive power, with the 4th lens combination with positive refractive power, this method comprises the steps:

The 3rd lens combination is provided, and according to the order from object, the 3rd lens combination comprises front lens group with positive refractive power and the rear lens group with negative refractive power;

Provide along the direction that is basically perpendicular to optical axis rear lens group movably;

Satisfy following conditional expression:

2.95＜f3/fw＜8.0

Wherein fw represents the focal length of this zoom-lens system under the wide-angle side state, and f3 represents the focal length of the 3rd lens combination; And

By changing the distance between this first lens combination and second lens combination, change the distance between this second lens combination and the 3rd lens combination, and change distance between the 3rd lens combination and the 4th lens combination, thereby focal length is changed to the end state of dolly-out,ing dolly-back from the wide-angle side state.

16. method according to claim 15 also comprises the steps:

Satisfy following conditional expression:

0.56＜f3/ft＜2.0

17. method according to claim 15 also comprises the steps:

Satisfy following conditional expression:

-0.275＜f2/f3＜-0.100

18. a zoom-lens system comprises according to the order from object:

First lens combination with positive refractive power;

Second lens combination with negative refractive power;

The 3rd lens combination with positive refractive power; With

The 4th lens combination with positive refractive power;

When from the wide-angle side state when dolly-out,ing dolly-back end state zoom, the distance between this first lens combination and second lens combination changes, the distance between this second lens combination and the 3rd lens combination changes, and the distance between the 3rd lens combination and the 4th lens combination changes,

According to the order from object, the 3rd lens combination comprises front lens group with positive refractive power and the rear lens group with negative refractive power,

-0.275＜f2/f3＜-0.100

19. zoom-lens system according to claim 18, wherein when from the wide-angle side state when dolly-out,ing dolly-back end state zoom, the distance between this first lens combination and second lens combination increases, the distance between this second lens combination and the 3rd lens combination reduces.

20. zoom-lens system according to claim 18, wherein foot is stated conditional expression:

1.96＜f3/f31＜5.00

Wherein f3 represents the focal length of the 3rd lens combination, and f31 represents the focal length of this front lens group.

21. zoom-lens system according to claim 18, the expression formula that wherein satisfies condition (9):

-4.00＜f3/f32＜-1.20 (9)

Wherein f3 represents the focal length of the 3rd lens combination, and f32 represents the focal length of this rear lens group.

22. zoom-lens system according to claim 18 wherein satisfies following conditional expression:

-1.00＜f31/f32＜-0.60

Wherein f31 represents the focal length of this front lens group, and f32 represents the focal length of this rear lens group.

23. zoom-lens system according to claim 18 wherein satisfies following conditional expression:

0.25＜f4/ft＜0.80

24. zoom-lens system according to claim 18 wherein satisfies following conditional expression:

1.00＜f3/f4＜5.00

25. zoom-lens system according to claim 18, wherein this rear lens group the lens surface of close object side be non-ball surface.

26. zoom-lens system according to claim 18, wherein at least one non-ball surface is included in this rear lens group.

27. want 18 described zoom-lens systems according to right, wherein at least one non-ball surface is included in the 4th lens combination.

28. zoom-lens system according to claim 18, wherein when from the wide-angle side state when dolly-out,ing dolly-back end state zoom, the distance between the 3rd lens combination and the 4th lens combination reduces.

29. zoom-lens system according to claim 18 is wherein focused by move this second lens combination along optical axis.

30. an imaging device is equipped with according to any one zoom-lens system in the claim 18 to 29.

31. method that changes the focal length of zoom-lens system, according to order from object, this zoom-lens system comprises: first lens combination with positive refractive power, second lens combination with negative refractive power, the 3rd lens combination with positive refractive power, and the 4th lens combination with positive refractive power, this method comprises the steps:

Satisfy following conditional expression:

-0.275＜f2/f3＜-0.100

Wherein f2 represents the focal length of this second lens combination, and f3 represents the focal length of the 3rd lens combination; And

32. method according to claim 31 also comprises the steps:

Satisfy following conditional expression:

1.96＜f3/f31＜5.00

33. method according to claim 31 also comprises the steps:

Satisfy following conditional expression:

-4.00＜f3/f32＜-1.20