JP2017078770A - Zoom lens and imaging device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a zoom lens which has a wide angle of view, is compact and lightweight, and achieves high optical performance over the whole zooming range, and an imaging device having the zoom lens.SOLUTION: The zoom lens includes, successively from an object side, a positive first lens group, a second lens group, a positive third lens group, a positive fourth lens group, and a rear group including at least one group. The second lens group comprises at least one sub-lens group, and has negative refractive power as a whole. The first lens group does not move for zooming; the second lens group moves upon zooming; and at least the fourth lens group among the third lens group, the fourth lens group and the rear group moves upon zooming. A diaphragm is present between the second lens group and the third lens group or between the third lens group and the fourth lens group. Lateral magnifications of the second lens group at a wide angle end and a telephoto end when a luminous flux enters from an infinity distance, focal distances at the wide angle end and the telephoto end of the zoom lens, a focal distance of the first lens group, and a focal distance at the wide angle end of the second lens group are appropriately set.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a zoom lens and an image pickup apparatus having the same, and is particularly suitable for a broadcast television camera, a movie camera, a digital still camera, a silver salt photography camera, and the like.

  In recent years, zoom lenses having a wide angle of view, a high zoom ratio, and high optical performance have been demanded for imaging devices such as a television camera, a movie camera, and a photographic camera. In particular, an imaging device such as a CCD or a CMOS used in a television or movie camera as a professional moving image shooting system has a substantially uniform resolution in the entire imaging range. Therefore, a zoom lens using this is required to have substantially uniform resolution from the center of the screen to the periphery of the screen. In addition, a reduction in size and weight is also demanded for shooting modes that emphasize mobility and operability. On the other hand, an interchangeable lens used for a television or a movie camera needs to ensure a sufficiently long back focus.

  As a zoom lens having a wide angle of view and a high zoom ratio, a positive lead type zoom lens in which a first lens group having a positive refractive power and a second lens group having a negative refractive power for zooming are arranged in order from the object side is known. It has been. For example, in Patent Document 1, the zoom ratio is about 8 and the angle of view at the wide-angle end is about 87 degrees. The second lens group and the subsequent lenses are a third lens group for correcting image plane variation accompanying zooming, and a fixed aperture for zooming. A zoom lens is disclosed. In Patent Document 2, the zoom ratio is about 11 and the field angle is about 76 degrees at the wide-angle end, and a diaphragm that moves during zooming is provided between the second lens group and the lens group on the image side from the second lens group. A zoom lens is disclosed.

JP-A-6-242378 JP 2014-63026 A

  The positive lead type zoom lens with the configuration described above is relatively easy to widen the angle of view, but in order to achieve both high optical performance and downsizing, it is important to set the lens refractive power arrangement appropriately. It is. In particular, since the first lens unit closest to the object side passes the position where the off-axis light beam is farthest from the optical axis, in order to achieve both optical performance and downsizing, a lens that moves during zooming and zooming of the optical system. It is important to appropriately set the variable magnification sharing of the group and the refractive power and configuration of the first lens group.

  In the zoom lens disclosed in Patent Document 1, since the stop is disposed on the image side of the second and third lens groups responsible for zooming, the stop is separated from the first lens group. This leads to an increase in the diameter and the number of lenses. In addition, the zoom lens disclosed in Patent Document 2 has an aperture that moves during zooming arranged between the second lens group and the third lens group, which is advantageous in reducing the size of the first lens group. However, since the refractive power of the first lens group is small, it is not a paraxial arrangement suitable for further widening the angle of view and miniaturization.

  By appropriately setting the aperture position and the refractive power of each lens group, the present invention has a wide angle of view, a high zoom ratio, small size and light weight, high optical performance over the entire zoom range, and a sufficiently long back. The objective is to provide a zoom lens that maintains focus. Specifically, a zoom lens having a high optical performance with a small and lightweight zoom lens having an angle of view of about 70 to 115 degrees at the wide angle end, an angle of view of about 8 to 60 degrees at the telephoto end, and a zoom ratio of about 2.5 to 10. The purpose is to provide.

In order to achieve the above object, a zoom lens according to the present invention includes, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group, a third lens group having a positive refractive power, A zoom lens having a fourth lens group having a refractive power and a rear group including at least one lens group, wherein the second lens group includes one or more sub-lens groups and is negative overall The first lens group does not move for zooming, the second lens group moves during zooming, and the third lens group, the fourth lens group, and the rear group have a refractive power. Among them, at least the fourth lens group moves during zooming, and has a stop between the second lens group and the third lens group or between the third lens group and the fourth lens group. At the wide-angle end and the telephoto end when The lateral magnifications of the two lens groups are β2w and β2t, the focal lengths at the wide-angle end and the telephoto end of the zoom lens are fw and ft, the focal length of the first lens group is f1, and the wide-angle end of the second lens group is at the wide-angle end. When the focal length is f2,
0.50 <(ft × β2w ² ) / (fw × β2t ² ) <1.40
-2.45 <f1 / f2 <−0.50
It is characterized by satisfying.

  By appropriately setting the aperture position and the refractive power of each lens group, it has a wide angle of view, high zoom ratio, small size and light weight, high optical performance over the entire zoom range, and sufficient back focus secured. A zoom lens is obtained.

Lens cross-sectional view when focusing on infinity at the wide-angle end in Numerical Example 1 Aberration diagram when focusing on infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 1. Lens cross-sectional view when focusing on infinity at the wide angle end in Numerical Example 2 Aberration diagram when focusing on infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 2. Lens cross-sectional view when focusing on infinity at the wide-angle end in Numerical Example 3 Aberration diagram at the time of focusing on infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 3. Lens sectional view at the time of focusing on infinity at the wide angle end in Numerical Example 4 Aberration diagram at the time of focusing on infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 4. Lens sectional view at the time of focusing on infinity at the wide angle end in Numerical Example 5 Aberration diagram when focusing on infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 5 Lens sectional view at the time of focusing on infinity at the wide angle end in Numerical Example 6 Aberration diagram when focusing on infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 6 Lens cross-sectional view when focusing on infinity at the wide angle end in Numerical Example 7 Aberration diagram when focusing on infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 7 Lens sectional view at the time of focusing on infinity at the wide-angle end in Numerical value example 8 Aberration diagram at the time of focusing on infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 8. Lens sectional view at the time of focusing on infinity at the wide angle end in Numerical Example 9 Aberration diagram when focusing on infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 9. Lens sectional view at the time of focusing on infinity at the wide angle end according to Numerical Example 10 Aberration diagram at the time of focusing on infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 10. Lens cross-sectional view at the time of focusing on infinity at the wide-angle end in Numerical Example 11 Aberration diagram when focusing on infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 11. Lens cross-sectional view at the time of focusing on infinity at the wide angle end in Numerical Example 12 Aberration diagram at the time of focusing on infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 12. Schematic diagram of main parts of an imaging apparatus of the present invention

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  First, features of the zoom lens according to the present invention will be described along conditional expressions. The zoom lens according to the present invention has a wide angle of view, a high zoom ratio, a small size and a light weight, high optical performance over the entire zoom range, and in order to achieve a zoom lens with a sufficiently long back focus, during zooming The variable power sharing of the moving lens group and the refractive power of the first lens group are defined.

The zoom lens of the present invention includes, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, It has a rear group including at least one lens group. The second lens group includes one or more sub lens groups and has a negative refractive power as a whole. The first lens group does not move for zooming, the second lens group moves during zooming, and at least the fourth lens group among the third lens group, the fourth lens group, and the rear group moves during zooming. Is arranged between the second lens group and the third lens group or between the third lens group and the fourth lens group. The rear group is composed of three or more lenses, and the lateral magnification of the second lens group at the wide-angle end and the telephoto end when the light beam enters from infinity is β2w and β2t, respectively, and the wide-angle end and the telephoto end of the zoom lens Are respectively fw and ft, the focal length of the first lens unit is f1, and the focal length at the wide angle end of the second lens unit is f2.
0.50 <(ft × β2w ² ) / (fw × β2t ² ) <1.40 (1)
-2.45 <f1 / f2 <−0.50 (2)
Meet.

  The zoom lens of the present invention is a positive lead type zoom lens in which a first lens group having a positive refractive power and a second lens group having a negative refractive power for zooming are arranged. Since the first lens group has a positive refractive power, it is advantageous for downsizing the second lens group that moves during zooming and for suppressing the movement amount of the second lens group. Further, at least the fourth lens unit moves during zooming, and shares the zoom ratio with the second lens unit. The second lens group has a negative refracting power as a whole, and the negative refracting power may be shared by a plurality of lens groups. More preferably, the second lens group is configured by one lens group. It is desirable that

Expression (1) defines the variable magnification sharing of the lens group that moves during zooming. By satisfying the expression (1), the zoom lens can be reduced in size and weight. Expression (1) indicates the ratio of the variable power sharing of the second lens group to the variable power sharing of the lens group that moves during zooming excluding the second lens group. Here, when the zoom lens zoom ratio is z, the zoom lens zoom ratio of the second lens group is z2, and the zoom lens group moving during zooming excluding the second lens group is z2ex, the zoom lens zoom ratio is expressed by the following equation. It is.
z = ft / fw (6)
z2 = β2t / β2w (7)
z2ex = z / z2 (8)

  Equation (1) represents the ratio of z2 and z2ex. The smaller the value of equation (1), the greater the variable magnification share of the second lens group, and the greater the amount of movement of the second lens group during magnification. . Conversely, the larger the value of the expression (1), the smaller the variable magnification share of the second lens group, and the smaller the amount of movement of the second lens group during zooming.

On the other hand, in the zoom lens of the present invention, the diaphragm is disposed between the second lens group and the third lens group or between the third lens group and the fourth lens group, and the first lens group and the diaphragm are brought close to each other, The lens diameter of one lens unit is reduced. The closer the diaphragm is to the first lens group, the smaller the first lens group is, but the larger the lens diameter of the rear group away from the diaphragm. Therefore, in order to achieve a reduction in size and weight of the entire zoom lens, it is important to appropriately set the position of the diaphragm. If the condition of the upper limit of the expression (1) is not satisfied, the variable magnification share of the second lens group during zooming is small, and the amount of movement of the second lens group is small. Therefore, it is possible to arrange the aperture close to the first lens group, which is advantageous for downsizing the first lens group, but the lens diameter of the rear group becomes large. Further, the amount of movement of the lens group that moves during zooming excluding the second lens group becomes large, and the entire length of the zoom lens becomes long. If the lower limit condition of the expression (1) is not satisfied, the variable power sharing of the second lens group during zooming is large, and the amount of movement of the second lens group is large. For this reason, it is difficult to dispose the aperture close to the first lens group, and the size reduction of the first lens group cannot be achieved. More preferably, the formula (1) is set as follows.
0.6 <(ft × β2w ² ) / (fw × β2t ² ) <1.0 (1a)

Equation (2) defines the ratio of the focal lengths of the first lens group and the second lens group. By satisfying the expression (2), both the wide angle of the zoom lens and the correction of the aberration variation are achieved. Since the focal length of the zoom lens is a value obtained by multiplying the focal length of the first lens group by the lateral magnification from the second lens group to the rear group, in order to achieve a wide angle, the focal length of the first lens group. It is necessary to set the distance appropriately. If the upper limit condition of the expression (2) is not satisfied, the refractive power of the first lens group becomes strong, and it becomes difficult to correct the aberration fluctuation accompanying zooming and the aberration fluctuation accompanying focusing. If the lower limit of the expression (2) is not satisfied, the refractive power of the first lens group will be insufficient, making it difficult to achieve both wide angle and small size and light weight. More preferably, the formula (2) is set as follows.
-2.45 <f1 / f2 <−0.80 (2a)

  In addition, the rear group includes three or more lenses and is configured to ensure a sufficiently long back focus. In order to increase the back focus of the zoom lens, a negative refractive power is disposed on the object side of the rear group, a positive refractive power is disposed on the image side, and the main point of the rear group is pushed toward the image side, thereby Back focus is secured. In order to satisfactorily correct chromatic aberration generated in the rear group by arranging negative refractive power on the object side of the rear group and positive refractive power on the image side, three or more lenses are required.

  More preferably, at least two of the third lens group, the fourth lens group, and the rear group move during zooming.

  As a further aspect of the zoom lens according to the present invention, the stop does not move in the optical axis direction for zooming.

As a further aspect of the zoom lens of the present invention, when the third lens group and the fourth lens group move during zooming, and the focal lengths of the third lens group and the fourth lens group are f3 and f4,
0.4 <f3 / f4 <2.5 (3)
Meet. By satisfying the expression (3), the zoom lens can be reduced in size and weight while achieving high optical performance. If the condition of the upper limit of the expression (3) is not satisfied, the focal length of the third lens group becomes relatively long, so that the axial luminous flux incident on the fourth lens group becomes high, and the increase in the lens diameter and the number of lenses It leads to increase. Further, since the axial light beam passing through the fourth lens group is highest at the telephoto end, it is difficult to correct spherical aberration at the telephoto end. If the condition of the lower limit of the expression (3) is not satisfied, the focal length of the fourth lens group becomes relatively long. Therefore, the amount of movement of the fourth lens group increases during zooming, and the total lens length becomes long. It becomes difficult to reduce the size and weight. More preferably, the expression (3) is set as follows.
0.5 <f3 / f4 <2.1 (3a)

As a further aspect of the zoom lens of the present invention, when the distance between the third lens group and the fourth lens group at the wide-angle end and the telephoto end is L34w and L34t,
0.01 <L34t / L34w <0.60 (4)
Meet. By satisfying the expression (4), the third lens group and the fourth lens group at the telephoto end are brought closer to the wide-angle end, and the combined refractive power of the third lens group and the fourth lens group at the telephoto end is increased. It becomes possible. As a result, the amount of movement of the third lens group and the fourth lens group during zooming can be reduced, and the overall lens length of the zoom lens can be shortened. If the lower limit condition of the expression (4) is not satisfied, the distance between the third lens group and the fourth lens group at the wide-angle end becomes large, so that the total lens length becomes long, and it becomes difficult to reduce the size and weight of the zoom lens. If the condition of the upper limit of the expression (4) is not satisfied, the distance between the third lens group and the fourth lens group at the telephoto end becomes relatively long, so that the combined refractive power of the third lens group and the fourth lens group is small. Therefore, the total lens length of the zoom lens becomes longer. More preferably, the equation (4) is set as follows.
0.02 <L34t / L34w <0.20 (4a)

  As a further aspect of the zoom lens according to the present invention, the rear group does not move for zooming. Further, a part of the rear lens group may be moved in a direction substantially orthogonal to the optical axis, so as to be an anti-vibration group that corrects blurring of a captured image when the entire zoom lens system vibrates. Furthermore, a part of the rear group lens group may be moved in the optical axis direction to be a flange back adjustment group that adjusts the distance from the mounting reference plane of the lens mount to the image plane.

As a further aspect of the zoom lens of the present invention, the first lens group includes, in order from the object side to the image side, a negative eleventh lens group that does not move for focusing, a positive twelfth lens group that moves during focusing, It is composed of a positive thirteenth lens group, and when the focal length of the eleventh lens group is f11,
−2.0 <f11 / f1 <−0.4 (5)
Meet. By satisfying the formula (5), the zoom lens can be made compact and lightweight while achieving high optical performance. If the upper limit condition of the expression (5) is not satisfied, the focal length of the eleventh lens group becomes relatively short, so that fluctuations in off-axis aberrations associated with zoom on the wide angle side, particularly distortion and curvature of field, are suppressed. It becomes difficult. If the condition of the lower limit of the expression (5) is not satisfied, the focal length of the eleventh lens group becomes relatively long, so that the lens diameter of the first lens group, particularly the eleventh lens group becomes large, and it is difficult to widen the angle. Become. In addition, it becomes difficult to suppress changes in the field of view during focusing. More preferably, the formula (5) is set as follows.
−1.4 <f11 / f1 <−0.5 (5a)

  Furthermore, the imaging apparatus of the present invention is characterized by having a solid-state imaging device having a predetermined effective imaging range for receiving an image formed by the zoom lens and the zoom lens of each embodiment.

  Hereinafter, a specific configuration of the zoom lens according to the present invention will be described based on the characteristics of the lens configurations of Numerical Examples 1 to 12 corresponding to Embodiments 1 to 12.

  FIG. 1 is a lens cross-sectional view of a zoom lens that is Embodiment 1 (Numerical Embodiment 1) of the present invention when focused at infinity at the wide-angle end. 2A shows a longitudinal aberration diagram at the wide-angle end of Numerical Example 1, FIG. 2B shows a focal length of 40 mm of Numerical Example 1, and FIG. 2C shows a longitudinal aberration diagram at the telephoto end of Numerical Example 1. FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity. The value of the focal length is a value when a numerical example described later is expressed in mm. The same applies to the following numerical examples.

  In FIG. 1, a first lens unit U1 having positive refractive power for focusing is provided in order from the object side to the image side. Further, when zooming from the wide-angle end to the telephoto end, it has a second lens unit U2 having a negative refractive power for zooming that moves toward the image side, and a third lens unit U3 that has a positive refractive power that moves toward the object side ing. In addition, a fourth lens unit U4 having a positive refractive power that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit U2 and the third lens unit U3 and corrects image plane fluctuations caused by zooming. Have. Further, the zoom lens has a fifth lens unit U5 that has an image forming action that does not move for zooming. In this embodiment, the rear group corresponds to the fifth lens group U5.

  In this embodiment, the second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zooming system. SP is an aperture stop, which is disposed between the second lens unit U2 and the third lens unit U3. The aperture stop can maintain a predetermined F number by changing the aperture diameter in accordance with zooming. Further, the aperture stop does not move in the optical axis direction during zooming. I is an image plane. When used as an imaging optical system for a broadcast television camera, a video camera, or a digital still camera, a solid-state imaging device (photoelectric conversion device) that receives an image formed by a zoom lens and photoelectrically converts it. ) And the like. When used as an imaging optical system for a film camera, the image formed by the zoom lens corresponds to the photosensitive film surface.

  In the longitudinal aberration diagram, the straight line and the two-dot chain line in the spherical aberration are the e-line and the g-line, respectively. A dotted line and a solid line in astigmatism are a meridional image surface and a sagittal image surface, respectively, and a two-dot chain line in lateral chromatic aberration is a g-line. ω is a half angle of view, and Fno is an F number. In the longitudinal aberration diagram, the spherical aberration is 0.4 mm, the astigmatism is 0.4 mm, the distortion is 10%, and the chromatic aberration of magnification is 0.1 mm. In each of the following embodiments, the wide-angle end and the telephoto end indicate zoom positions when the second lens unit U2 for zooming is located at both ends of a range that can move on the optical axis with respect to the mechanism.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the fifteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The lens unit U12 includes a thirteenth lens unit U13 having a positive refractive power. The thirteenth lens unit U13 may move in conjunction with the twelfth lens unit U12 during focusing. The second lens group U2 corresponds to the 16th to 22nd surfaces, the third lens group U3 corresponds to the 24th to 25th surfaces, and the fourth lens group U4 corresponds to the 26th to 30th surfaces. Yes. The fifth lens unit U5 corresponds to the 31st surface to the 38th surface. The first lens unit U1 includes a convex lens and a concave lens, and is composed of eight lenses as a whole. The second lens group U2 includes a convex lens and a concave lens as a whole, and includes four lenses. The third lens group U3 includes one convex lens. The fourth lens group U4 includes a convex lens and a concave lens as a whole. It is made up. The fifth lens unit U5 includes a convex lens and a concave lens, and is composed of five lenses as a whole.

Numerical Example 1 corresponding to Example 1 will be described. In all numerical examples, not limited to Numerical Example 1, i indicates the order of surfaces (optical surfaces) from the object side, ri is the radius of curvature of the i-th surface from the object side, and di is the i-th surface from the object side. The interval (on the optical axis) between the i th surface and the (i + 1) th surface is shown. Ndi, νdi, and θgFi represent the refractive index, Abbe number, and partial dispersion ratio of the medium (optical member) between the i-th surface and the (i + 1) -th surface, and BF represents air-converted back focus. ing. A surface with * on the right side of the surface number indicates an aspheric surface. The aspherical shape is the X axis in the optical axis direction, the H axis in the direction perpendicular to the optical axis, the light traveling direction is positive, R is the paraxial radius of curvature, k is the cone constant, A4, A6, A8, A10, A12, When A14 and A16 are respectively aspherical coefficients, they are expressed by the following equations. “E-Z” means “× 10 ^−Z ”.

  Table 1 shows values corresponding to the conditional expressions of this example. In this embodiment, the expressions (1) to (5) are satisfied, and a wide angle and a high magnification are achieved with a shooting angle of view (field angle) of 78.6 ° at a wide angle end and a zoom ratio of 4.74. ing. In addition, a zoom lens that achieves both high optical performance, in which various aberrations are satisfactorily corrected throughout the entire zoom range, and a reduction in size and weight is achieved. Furthermore, a zoom lens that secures a sufficiently long back focus has been achieved.

  However, in the zoom lens of the present invention, it is essential that the expressions (1) and (2) are satisfied, but the expressions (3) to (5) may not be satisfied. However, if at least one of the expressions (3) to (5) is satisfied, a better effect can be obtained. The same applies to the other embodiments.

  FIG. 25 is a schematic diagram of an image pickup apparatus (television camera system) using the zoom lens of each embodiment as a photographing optical system. In FIG. 25, reference numeral 101 denotes a zoom lens according to any one of Examples 1 to 12. Reference numeral 124 denotes a camera. The zoom lens 101 can be attached to and detached from the camera 124. An imaging apparatus 125 is configured by attaching the zoom lens 101 to the camera 124. The zoom lens 101 includes a first lens group F, a zoom unit LZ, and a rear group R for image formation. The first lens group F includes a focusing lens group. The zooming unit LZ includes a second lens group that moves on the optical axis during zooming, a third lens group, and a fourth lens group that moves on the optical axis in order to correct image plane variation caused by zooming. SP is an aperture stop. Reference numerals 114 and 115 denote driving mechanisms such as helicoids and cams for driving the first lens group F and the zooming portion LZ in the optical axis direction, respectively. Reference numerals 116 to 118 denote motors (drive means) that electrically drive the drive mechanisms 114 and 115 and the aperture stop SP. Reference numerals 119 to 121 denote detectors such as an encoder, a potentiometer, or a photosensor for detecting the positions of the first lens group F and the zooming unit LZ on the optical axis and the aperture diameter of the aperture stop SP. In the camera 124, 109 is a glass block corresponding to an optical filter or color separation optical system in the camera 124, and 110 is a solid-state imaging device (photoelectric conversion) such as a CCD sensor or a CMOS sensor that receives an object image formed by the zoom lens 101. Element). Reference numerals 111 and 122 denote CPUs that control various types of driving of the camera 124 and the zoom lens 101.

  In this way, an imaging apparatus having high optical performance is realized by applying the zoom lens of the present invention to a television camera.

  FIG. 3 is a lens cross-sectional view of a zoom lens that is Embodiment 2 (Numerical Embodiment 2) of the present invention when focused at infinity at the wide angle end. 2A is a longitudinal angle diagram of Numerical Example 2, FIG. 2B is a focal length 16 mm of Numerical Example 2, and FIG. 2C is a longitudinal aberration diagram of the Telephoto end of Numerical Example 2. FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 3, the first lens unit U1 having a positive refractive power for focusing is provided in order from the object side to the image side. Further, when zooming from the wide-angle end to the telephoto end, it has a second lens unit U2 having a negative refractive power for zooming that moves toward the image side, and a third lens unit U3 that has a positive refractive power that moves toward the object side ing. In addition, a fourth lens unit U4 having a positive refractive power that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit U2 and the third lens unit U3 and corrects image plane fluctuations caused by zooming. Have. Further, the zoom lens has a fifth lens unit U5 that has an image forming action that does not move for zooming. In this embodiment, the rear group corresponds to the fifth lens group U5.

  In this embodiment, the second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zooming system. SP is an aperture stop, which is disposed between the second lens unit U2 and the third lens unit U3. The aperture stop can maintain a predetermined F number by changing the aperture diameter according to zooming. Further, the aperture stop does not move in the optical axis direction during zooming.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the sixteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The lens unit U12 includes a thirteenth lens unit U13 having a positive refractive power. The thirteenth lens unit U13 may move in conjunction with the twelfth lens unit U12 during focusing. The second lens group U2 corresponds to the 17th to 23rd surfaces, the third lens group U3 corresponds to the 25th to 26th surfaces, and the fourth lens group U4 corresponds to the 27th to 30th surfaces. Yes. The fifth lens unit U5 corresponds to the 31st surface to the 41st surface. The first lens unit U1 includes a convex lens and a concave lens, and is composed of nine lenses as a whole. The second lens group U2 includes a convex lens and a concave lens as a whole and includes four lenses, the third lens group U3 includes one convex lens, and the fourth lens group U4 includes a convex lens and a concave lens as a whole from two lenses. It is made up. The fifth lens unit U5 includes seven lenses as a whole, including a convex lens and a concave lens.

  Table 1 shows values corresponding to the conditional expressions of this example. This embodiment satisfies the expressions (1) to (5), and achieves both a wide angle and a high magnification with a shooting angle of view (view angle) of 114.5 ° at a wide angle end and a zoom ratio of 2.5. ing. In addition, a zoom lens that achieves both high optical performance, in which various aberrations are satisfactorily corrected throughout the entire zoom range, and a reduction in size and weight is achieved. Furthermore, a zoom lens that secures a sufficiently long back focus has been achieved.

  FIG. 5 is a lens cross-sectional view of a zoom lens that is Embodiment 3 (Numerical Embodiment 3) of the present invention when focused at infinity at the wide-angle end. 5A is a longitudinal angle view of Numerical Example 3, FIG. 5B is a focal length of 21 mm of Numerical Example 3, and FIG. 5C is a longitudinal aberration diagram of the telephoto end of Numerical Example 3. FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 5, the first lens unit U1 having positive refractive power for focusing is provided in order from the object side to the image side. Further, when zooming from the wide-angle end to the telephoto end, it has a second lens unit U2 having a negative refractive power for zooming that moves toward the image side, and a third lens unit U3 that has a positive refractive power that moves toward the object side ing. In addition, a fourth lens unit U4 having a positive refractive power that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit U2 and the third lens unit U3 and corrects image plane fluctuations caused by zooming. Have. Further, the zoom lens has a fifth lens unit U5 that has an image forming action that does not move for zooming. In this embodiment, the rear group corresponds to the fifth lens group U5.

  In this embodiment, the second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zooming system. SP is an aperture stop, which is disposed between the second lens unit U2 and the third lens unit U3. The aperture stop can maintain a predetermined F number by changing the aperture diameter according to zooming. Further, the aperture stop does not move in the optical axis direction during zooming.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the fifteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The lens unit U12 includes a thirteenth lens unit U13 having a positive refractive power. The thirteenth lens unit U13 may move in conjunction with the twelfth lens unit U12 during focusing. The second lens group U2 corresponds to the 16th to 20th surfaces, the third lens group U3 corresponds to the 22nd to 25th surfaces, and the fourth lens group U4 corresponds to the 26th to 28th surfaces. Yes. The fifth lens unit U5 corresponds to the 29th to 38th surfaces. The first lens unit U1 includes a convex lens and a concave lens, and is composed of eight lenses as a whole. The second lens group U2 includes a convex lens and a concave lens as a whole, and includes three lenses. The third lens group U3 includes two convex lenses, and the fourth lens group U4 includes a convex lens and a concave lens as a whole. It is made up. The fifth lens unit U5 includes a convex lens and a concave lens and is composed of six lenses as a whole.

  Table 1 shows values corresponding to the conditional expressions of this example. In this embodiment, the expressions (1) to (5) are satisfied, and it is possible to achieve both a wide angle and a high magnification with a shooting angle of view (view angle) of 96.0 ° at a wide angle end and a zoom ratio of 2.5. ing. In addition, a zoom lens that achieves both high optical performance, in which various aberrations are satisfactorily corrected throughout the entire zoom range, and a reduction in size and weight is achieved. Furthermore, a zoom lens that secures a sufficiently long back focus has been achieved.

  FIG. 7 is a lens cross-sectional view of a zoom lens that is Embodiment 4 (Numerical Embodiment 4) of the present invention when focused at infinity at the wide-angle end. 7A shows a longitudinal aberration diagram at the wide-angle end of Numerical Example 4, FIG. 7B shows a focal length of 30 mm at Numerical Example 4, and FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 7, a first lens unit U1 having a positive refractive power for focusing is provided in order from the object side to the image side. Further, when zooming from the wide-angle end to the telephoto end, it has a second lens unit U2 having a negative refractive power for zooming that moves toward the image side, and a fourth lens unit U4 with a positive refractive power that moves toward the object side ing. Further, a sixth lens unit U6 having a positive refractive power that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit U2 and the fourth lens unit U4 and corrects image plane fluctuations caused by zooming. Have. Further, it has a third lens unit U3 having a positive refractive power and a fifth lens unit U5 having a negative refractive power that do not move for zooming. In this embodiment, the rear group corresponds to the fifth lens group U5 and the sixth lens group U6.

  In this embodiment, the second lens unit U2, the fourth lens unit U4, and the sixth lens unit U6 constitute a zooming system. SP is an aperture stop, which is disposed between the second lens unit U2 and the third lens unit U3. The aperture stop can maintain a predetermined F number by changing the aperture diameter according to zooming. Further, the aperture stop does not move in the optical axis direction during zooming.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the fifteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The lens unit U12 includes a thirteenth lens unit U13 having a positive refractive power. The thirteenth lens unit U13 may move in conjunction with the twelfth lens unit U12 during focusing. The second lens group U2 corresponds to the 16th to 20th surfaces, the third lens group U3 corresponds to the 22nd to 23rd surfaces, and the fourth lens group U4 corresponds to the 24th to 27th surfaces. Yes. The fifth lens unit U5 corresponds to the 28th to 30th surfaces, and the sixth lens unit U6 corresponds to the 31st to 37th surfaces. The first lens unit U1 includes a convex lens and a concave lens, and is composed of eight lenses as a whole. The second lens group U2 includes a convex lens and a concave lens as a whole, three lenses, the third lens group U3 includes one convex lens, and the fourth lens group U4 includes a convex lens and a concave lens as a whole from two lenses. It is made up. The fifth lens unit U5 includes a convex lens and a concave lens, and includes two lenses as a whole. The sixth lens unit U6 includes a convex lens and a concave lens, and includes a total of four lenses.

  Table 1 shows values corresponding to the conditional expressions of this example. The present embodiment satisfies the expressions (1), (2), and (5), and has both a wide angle of view and a high magnification with a shooting angle of view (field angle) of 96.0 ° at the wide angle end and a zoom ratio of 5. Have achieved. In addition, a zoom lens that achieves both high optical performance, in which various aberrations are satisfactorily corrected throughout the entire zoom range, and a reduction in size and weight is achieved. Furthermore, a zoom lens that secures a sufficiently long back focus has been achieved.

  FIG. 9 is a lens cross-sectional view of a zoom lens that is Embodiment 5 (Numerical Embodiment 5) of the present invention when focused at infinity at the wide-angle end. 9A is a longitudinal aberration diagram at the wide-angle end of Numerical Example 5, FIG. 9B is a focal length at 25 mm of Numerical Example 5, and FIG. 9C is a longitudinal aberration diagram at the telephoto end of Numerical Example 3. FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 9, the first lens unit U1 having a positive refractive power for focusing is provided in order from the object side to the image side. Further, when zooming from the wide-angle end to the telephoto end, it has a second lens unit U2 having a negative refractive power for zooming that moves toward the image side, and a third lens unit U3 that has a positive refractive power that moves toward the object side ing. In addition, a fourth lens unit U4 having a positive refractive power that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit U2 and the third lens unit U3 and corrects image plane fluctuations caused by zooming. Have. Further, the zoom lens has a fifth lens unit U5 that has an image forming action that does not move for zooming. In this embodiment, the rear group corresponds to the fifth lens group U5. Further, by moving a part of the lens unit U51 of the fifth lens unit U5 in a direction substantially orthogonal to the optical axis, the image stabilization unit corrects blurring of a captured image when the entire zoom lens system vibrates. Also good. Further, a part of the lens unit U52 of the fifth lens unit U5 may be moved in the optical axis direction to be a flange back adjustment group that adjusts the distance from the lens mount attachment reference plane to the image plane.

  In this embodiment, the second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zooming system. SP is an aperture stop, which is disposed between the second lens unit U2 and the third lens unit U3. The aperture stop can maintain a predetermined F number by changing the aperture diameter according to zooming. Further, the aperture stop does not move in the optical axis direction during zooming.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the thirteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The lens unit U12 includes a thirteenth lens unit U13 having a positive refractive power. The thirteenth lens unit U13 may move in conjunction with the twelfth lens unit U12 during focusing. The second lens group U2 corresponds to the 14th to 20th surfaces, the third lens group U3 corresponds to the 22nd to 24th surfaces, and the fourth lens group U4 corresponds to the 25th to 27th surfaces. Yes. The fifth lens unit U5 corresponds to the 28th to 37th surfaces, U51 corresponds to the 28th to 30th surfaces, and U52 corresponds to the 31st to 37th surfaces. The first lens unit U1 includes a convex lens and a concave lens, and is composed of seven lenses as a whole. The second lens group U2 includes a convex lens and a concave lens as a whole and includes four lenses. The third lens group U3 includes a convex lens and a concave lens as a whole and includes two lenses. The fourth lens group U4 includes a convex lens and a concave lens. As a whole, it consists of two lenses. The fifth lens unit U5 includes a convex lens and a concave lens and is composed of six lenses as a whole.

  Table 1 shows values corresponding to the conditional expressions of this example. In this embodiment, the expressions (1) to (5) are satisfied, and a wide angle and high magnification are achieved with a shooting angle of view (angle of view) of 88.4 ° at a wide angle end and a zoom ratio of 2.81. ing. In addition, a zoom lens that achieves both high optical performance, in which various aberrations are satisfactorily corrected throughout the entire zoom range, and a reduction in size and weight is achieved. Furthermore, a zoom lens that secures a sufficiently long back focus has been achieved.

  FIG. 11 is a lens cross-sectional view of a zoom lens that is Embodiment 6 (Numerical Embodiment 6) of the present invention when focused at infinity at the wide-angle end. 11A is a longitudinal aberration diagram at the wide-angle end of Numerical Example 6, FIG. 11B is a focal length of 50 mm according to Numerical Example 6, and FIG. 11C is a longitudinal aberration diagram at the telephoto end of Numerical Example 6. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 11, a first lens unit U1 having positive refractive power for focusing is provided in order from the object side to the image side. Further, when zooming from the wide-angle end to the telephoto end, it has a second lens unit U2 having a negative refractive power for zooming that moves toward the image side, and a third lens unit U3 that has a positive refractive power that moves toward the object side ing. In addition, a fourth lens unit U4 having a positive refractive power that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit U2 and the third lens unit U3 and corrects image plane fluctuations caused by zooming. Have. Further, the zoom lens has a fifth lens unit U5 that has an image forming action that does not move for zooming. In this embodiment, the rear group corresponds to the fifth lens group U5.

  In this embodiment, the second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zooming system. SP is an aperture stop, which is disposed between the second lens unit U2 and the third lens unit U3. The aperture stop can maintain a predetermined F number by changing the aperture diameter according to zooming. Further, the aperture stop does not move in the optical axis direction during zooming.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the seventeenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The lens unit U12 includes a thirteenth lens unit U13 having a positive refractive power. The thirteenth lens unit U13 may move in conjunction with the twelfth lens unit U12 during focusing. The second lens unit U2 corresponds to the 18th to 24th surfaces, the third lens unit U3 corresponds to the 26th to 27th surfaces, and the fourth lens unit U4 corresponds to the 28th to 32nd surfaces. Yes. The fifth lens unit U5 corresponds to the 33rd to 40th surfaces. The first lens unit U1 includes a convex lens and a concave lens, and is composed of nine lenses as a whole. The second lens group U2 includes a convex lens and a concave lens as a whole, and includes four lenses. The third lens group U3 includes one convex lens. The fourth lens group U4 includes a convex lens and a concave lens as a whole. It is made up. The fifth lens unit U5 includes a convex lens and a concave lens, and is composed of five lenses as a whole.

  Table 1 shows values corresponding to the conditional expressions of this example. In this embodiment, the expressions (1) to (5) are satisfied, and a wide angle and a high magnification are achieved with a shooting angle of view (view angle) of 84.9 ° at the wide angle end and a zoom ratio of 7.06. ing. In addition, a zoom lens that achieves both high optical performance, in which various aberrations are satisfactorily corrected throughout the entire zoom range, and a reduction in size and weight is achieved. Furthermore, a zoom lens that secures a sufficiently long back focus has been achieved.

  FIG. 13 is a lens cross-sectional view of the zoom lens that is Embodiment 7 (Numerical Embodiment 7) of the present invention when focused at infinity at the wide-angle end. 13A shows a longitudinal aberration diagram at the wide-angle end of Numerical Example 7, FIG. 13B shows a focal length of 40 mm according to Numerical Example 7, and FIG. 13C shows a longitudinal aberration diagram at the telephoto end of Numerical Example 7. FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 13, a first lens unit U1 having a positive refractive power for focusing is provided in order from the object side to the image side. Further, when zooming from the wide-angle end to the telephoto end, it has a second lens unit U2 having a negative refractive power for zooming that moves toward the image side, and a fourth lens unit U4 with a positive refractive power that moves toward the object side ing. Further, a fifth lens unit U5 having a negative refractive power that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit U2 and the fourth lens unit U4 and corrects image plane fluctuations caused by zooming. Have. Further, the zoom lens includes a third lens unit U3 having a positive refractive power and a sixth lens unit U6 having a positive refractive power that do not move for zooming. In this embodiment, the rear group corresponds to the fifth lens group U5 and the sixth lens group U6.

  In this embodiment, the second lens unit U2, the fourth lens unit U4, and the fifth lens unit U5 constitute a variable power system. SP is an aperture stop, which is disposed between the second lens unit U2 and the third lens unit U3. The aperture stop can maintain a predetermined F number by changing the aperture diameter according to zooming. Further, the aperture stop does not move in the optical axis direction during zooming.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the fifteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The lens unit U12 includes a thirteenth lens unit U13 having a positive refractive power. The thirteenth lens unit U13 may move in conjunction with the twelfth lens unit U12 during focusing. The second lens group U2 corresponds to the 16th to 22nd surfaces, the third lens group U3 corresponds to the 24th to 27th surfaces, and the fourth lens group U4 corresponds to the 28th to 33rd surfaces. Yes. The fifth lens unit U5 corresponds to the 34th to 36th surfaces, and the sixth lens unit U6 corresponds to the 37th to 43rd surfaces. The first lens unit U1 includes a convex lens and a concave lens, and is composed of eight lenses as a whole. The second lens group U2 includes a convex lens and a concave lens as a whole, and is composed of four lenses. The third lens group U3 includes two convex lenses, and the fourth lens group U4 includes a convex lens and a concave lens as a whole. It is made up. The fifth lens unit U5 includes a convex lens and a concave lens, and includes two lenses as a whole. The sixth lens unit U6 includes a convex lens and a concave lens, and includes a total of four lenses.

  Table 1 shows values corresponding to the conditional expressions of this example. This embodiment satisfies the expressions (1), (2), and (5), and has a shooting angle of view (angle of view) of 78.6 ° at the wide angle end, a zoom ratio of 4.74, and a wide angle and high magnification. Achieving balance. In addition, a zoom lens that achieves both high optical performance, in which various aberrations are satisfactorily corrected throughout the entire zoom range, and a reduction in size and weight is achieved. Furthermore, a zoom lens that secures a sufficiently long back focus has been achieved.

  FIG. 15 is a lens cross-sectional view of the zoom lens that is Embodiment 8 (Numerical Embodiment 8) of the present invention when focused at infinity at the wide-angle end. 15A is a longitudinal aberration diagram at the wide-angle end of Numerical Example 8, FIG. 15B is a focal length at 40 mm of Numerical Example 8, and FIG. 15C is a longitudinal aberration diagram at the telephoto end of Numerical Example 8. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 15, a first lens unit U1 having a positive refractive power for focusing is provided in order from the object side to the image side. Further, when zooming from the wide-angle end to the telephoto end, it has a second lens unit U2 having a negative refractive power for zooming that moves toward the image side, and a third lens unit U3 that has a positive refractive power that moves toward the object side ing. In addition, a fourth lens unit U4 having a positive refractive power that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit U2 and the third lens unit U3 and corrects image plane fluctuations caused by zooming. Have. Further, the zoom lens has a fifth lens unit U5 that has an image forming action that does not move for zooming. In this embodiment, the rear group corresponds to the fifth lens group U5.

  In this embodiment, the second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zooming system. SP is an aperture stop, which is disposed between the third lens unit U3 and the fourth lens unit U4. The aperture stop can maintain a predetermined F number by changing the aperture diameter according to zooming. Further, the aperture stop does not move in the optical axis direction during zooming.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the fifteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The lens unit U12 includes a thirteenth lens unit U13 having a positive refractive power. The thirteenth lens unit U13 may move in conjunction with the twelfth lens unit U12 during focusing. The second lens group U2 corresponds to the 16th to 22nd surfaces, the third lens group U3 corresponds to the 23rd to 24th surfaces, and the fourth lens group U4 corresponds to the 26th to 30th surfaces. Yes. The fifth lens unit U5 corresponds to the 31st surface to the 36th surface. The first lens unit U1 includes a convex lens and a concave lens, and is composed of eight lenses as a whole. The second lens group U2 includes a convex lens and a concave lens as a whole, and includes four lenses. The third lens group U3 includes one convex lens. The fourth lens group U4 includes a convex lens and a concave lens as a whole. It is made up. The fifth lens unit U5 includes a convex lens and a concave lens, and is composed of four lenses as a whole.

  Table 1 shows values corresponding to the conditional expressions of this example. In this embodiment, the expressions (1) to (5) are satisfied, and a wide angle and a high magnification are achieved with a shooting angle of view (field angle) of 78.6 ° at a wide angle end and a zoom ratio of 4.74. ing. In addition, a zoom lens that achieves both high optical performance, in which various aberrations are satisfactorily corrected throughout the entire zoom range, and a reduction in size and weight is achieved. Furthermore, a zoom lens that secures a sufficiently long back focus has been achieved.

  FIG. 17 is a lens cross-sectional view of a zoom lens that is Embodiment 9 (Numerical Embodiment 9) of the present invention when focused at infinity at the wide-angle end. 17A shows a longitudinal aberration diagram of Numerical Example 9, FIG. 17B shows a focal length of 70 mm in Numerical Example 9, and FIG. 17C shows a longitudinal aberration diagram at the telephoto end of Numerical Example 9. FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 17, the first lens unit U1 having a positive refractive power for focusing is provided in order from the object side to the image side. Further, when zooming from the wide-angle end to the telephoto end, it has a second lens unit U2 having a negative refractive power for zooming that moves toward the image side, and a third lens unit U3 that has a positive refractive power that moves toward the object side ing. In addition, a fourth lens unit U4 having a positive refractive power that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit U2 and the third lens unit U3 and corrects image plane fluctuations caused by zooming. Have. Further, the zoom lens has a fifth lens unit U5 that has an image forming action that does not move for zooming. In this embodiment, the rear group corresponds to the fifth lens group U5.

  In this embodiment, the second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zooming system. SP is an aperture stop, which is disposed between the second lens unit U2 and the third lens unit U3. The aperture stop can maintain a predetermined F number by changing the aperture diameter according to zooming. Further, the aperture stop does not move in the optical axis direction during zooming.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the fifteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The lens unit U12 includes a thirteenth lens unit U13 having a positive refractive power. The thirteenth lens unit U13 may move in conjunction with the twelfth lens unit U12 during focusing. The second lens group U2 corresponds to the 16th to 22nd surfaces, the third lens group U3 corresponds to the 24th to 25th surfaces, and the fourth lens group U4 corresponds to the 26th to 30th surfaces. Yes. The fifth lens unit U5 corresponds to the 31st surface to the 36th surface. The first lens unit U1 includes a convex lens and a concave lens, and is composed of eight lenses as a whole. The second lens group U2 includes a convex lens and a concave lens as a whole, and includes four lenses. The third lens group U3 includes one convex lens. The fourth lens group U4 includes a convex lens and a concave lens as a whole. It is made up. The fifth lens unit U5 includes a convex lens and a concave lens, and is composed of four lenses as a whole.

  Table 1 shows values corresponding to the conditional expressions of this example. The present embodiment satisfies the expressions (1) to (5), and achieves both a shooting angle of view (view angle) of 70.5 ° at the wide angle end, a zoom ratio of 10, a wide angle, and a high magnification. . In addition, a zoom lens that achieves both high optical performance, in which various aberrations are satisfactorily corrected throughout the entire zoom range, and a reduction in size and weight is achieved. Furthermore, a zoom lens that secures a sufficiently long back focus has been achieved.

  FIG. 19 is a lens cross-sectional view of the zoom lens that is Embodiment 10 (Numerical Embodiment 10) of the present invention when focused at infinity at the wide-angle end. 19A shows a longitudinal aberration diagram at the wide-angle end of Numerical Example 10, FIG. 19B shows a focal length of 55 mm of Numerical Example 10, and FIG. 19C shows a longitudinal aberration diagram at the telephoto end of Numerical Example 10. FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 19, the first lens unit U1 having a positive refractive power for focusing is provided in order from the object side to the image side. Further, when zooming from the wide-angle end to the telephoto end, it has a second lens unit U2 having a negative refractive power for zooming that moves toward the image side, and a third lens unit U3 that has a positive refractive power that moves toward the object side ing. In addition, a fourth lens unit U4 having a positive refractive power that moves non-linearly on the optical axis in conjunction with the movement of the second lens unit U2 and the third lens unit U3 and corrects image plane fluctuations caused by zooming. Have. Further, the zoom lens has a fifth lens unit U5 that has an image forming action that does not move for zooming. In this embodiment, the rear group corresponds to the fifth lens group U5.

  In this embodiment, the second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zooming system. SP is an aperture stop, which is disposed between the second lens unit U2 and the third lens unit U3. The aperture stop can maintain a predetermined F number by changing the aperture diameter according to zooming. Further, the aperture stop does not move in the optical axis direction during zooming.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the fifteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The lens unit U12 includes a thirteenth lens unit U13 having a positive refractive power. The thirteenth lens unit U13 may move in conjunction with the twelfth lens unit U12 during focusing. The second lens group U2 corresponds to the 16th to 22nd surfaces, the third lens group U3 corresponds to the 24th to 25th surfaces, and the fourth lens group U4 corresponds to the 26th to 30th surfaces. Yes. The fifth lens unit U5 corresponds to the 31st surface to the 35th surface. The first lens unit U1 includes a convex lens and a concave lens, and is composed of eight lenses as a whole. The second lens group U2 includes a convex lens and a concave lens as a whole, and includes four lenses. The third lens group U3 includes one convex lens. The fourth lens group U4 includes a convex lens and a concave lens as a whole. It is made up. The fifth lens unit U5 includes a convex lens and a concave lens, and is composed of three lenses as a whole.

  Table 1 shows values corresponding to the conditional expressions of this example. In this embodiment, the expressions (1) to (5) are satisfied, and a shooting angle of view (view angle) at the wide-angle end of 65.9 °, a zoom ratio of 5, a wide angle, and high magnification are achieved. . In addition, a zoom lens that achieves both high optical performance, in which various aberrations are satisfactorily corrected throughout the entire zoom range, and a reduction in size and weight is achieved. Furthermore, a zoom lens that secures a sufficiently long back focus has been achieved.

  FIG. 21 is a lens cross-sectional view of the zoom lens according to Example 11 (Numerical Example 11) of the present invention when focused at infinity at the wide angle end. 21A shows a longitudinal aberration diagram at the wide-angle end in Numerical Example 11, FIG. 21B shows a focal length of 45 mm in Numerical Example 11, and FIG. 21C shows a longitudinal aberration diagram at the telephoto end in Numerical Example 11. FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 21, the first lens unit U1 having positive refractive power for focusing is provided in order from the object side to the image side. Further, during zooming from the wide-angle end to the telephoto end, a second lens unit U2 having a negative refractive power that moves toward the image side, a third lens unit U3 having a positive refractive power that moves toward the object side, an object side Positive fourth lens unit U4. Further, the lens moves in a non-linear manner on the optical axis in conjunction with the movement of the second lens unit U2, the third lens unit U3, and the fourth lens unit U4, and has a negative refractive power that corrects image plane fluctuations associated with zooming. The fifth lens unit U5 is included. Further, the zoom lens has a sixth lens unit U6 that has an image forming action that does not move for zooming. In this embodiment, the rear group corresponds to the fifth lens group U5 and the sixth lens group U6.

  In this embodiment, the second lens unit U2, the third lens unit U3, the fourth lens unit U4, and the fifth lens unit U5 constitute a zooming system. SP is an aperture stop, which is disposed between the second lens unit U2 and the third lens unit U3. The aperture stop can maintain a predetermined F number by changing the aperture diameter according to zooming. The aperture stop moves in the optical axis direction during zooming.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the sixteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The lens unit U12 includes a thirteenth lens unit U13 having a positive refractive power. The thirteenth lens unit U13 may move in conjunction with the twelfth lens unit U12 during focusing. The second lens group U2 corresponds to the 17th to 23rd surfaces, the third lens group U3 corresponds to the 25th to 27th surfaces, and the fourth lens group U4 corresponds to the 28th to 30th surfaces. . The fifth lens unit U5 corresponds to the 31st to 33rd surfaces, and the sixth lens unit U6 corresponds to the 34th to 41st surfaces. The first lens unit U1 includes a convex lens and a concave lens, and is composed of nine lenses as a whole. The second lens group U2 includes a convex lens and a concave lens as a whole and includes four lenses. The third lens group U3 includes a convex lens and a concave lens as a whole and includes two lenses. The fourth lens group U4 includes a convex lens and a concave lens as a whole. It consists of two lenses. The fifth lens group U5 includes two lenses as a whole including a convex lens and a concave lens, and the sixth lens group U6 includes five lenses as a whole including a convex lens and a concave lens.

  Table 1 shows values corresponding to the conditional expressions of this example. In this embodiment, the expressions (1) to (5) are satisfied, and a wide angle and high magnification are achieved with a shooting angle of view (view angle) of 75.4 ° at a wide angle end and a zoom ratio of 3.04. ing. In addition, a zoom lens that achieves both high optical performance, in which various aberrations are satisfactorily corrected throughout the entire zoom range, and a reduction in size and weight is achieved. Furthermore, a zoom lens that secures a sufficiently long back focus has been achieved.

  FIG. 23 is a lens cross-sectional view of the zoom lens that is Embodiment 12 (Numerical Embodiment 12) of the present invention when focused at infinity at the wide-angle end. In FIG. 23, (a) is a wide angle end of Numerical Example 12, (b) is a focal length of 40 mm of Numerical Example 12, and (c) is a longitudinal aberration diagram of the telephoto end of Numerical Example 12. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 23, a first lens unit U1 having a positive refractive power for focusing is provided in order from the object side to the image side. Further, during zooming from the wide-angle end to the telephoto end, a 21st lens unit U21 having a negative refractive power that moves toward the image side and a 22nd lens unit that has a negative refractive power that moves toward the image side U22. The 21st lens unit U21 and the 22nd lens unit U22 move along different paths during zooming. Further, a fourth lens unit U4 having a positive refractive power that moves non-linearly on the optical axis in conjunction with the movement of the twenty-first lens unit U21 and the twenty-second lens unit U22 and corrects image plane fluctuations caused by zooming. Have. Furthermore, it has the 3rd lens group U3 and the 5th lens group U5 which do not move for zooming. In this embodiment, the second lens group corresponds to the 21st lens group U21 and the 22nd lens group U22, and the rear group corresponds to the fifth lens group U5.

  In this embodiment, the twenty-first lens unit U21, the twenty-second lens unit U22, and the fourth lens unit U4 constitute a zooming system. SP is an aperture stop, which is disposed between the second lens unit U2 and the third lens unit U3. The aperture stop can maintain a predetermined F number by changing the aperture diameter according to zooming. Further, the aperture stop does not move in the optical axis direction during zooming.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the fifteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The lens unit U12 includes a thirteenth lens unit U13 having a positive refractive power. The thirteenth lens unit U13 may move in conjunction with the twelfth lens unit U12 during focusing. The twenty-first lens group U21 is from the 16th surface to the twentieth surface, the twenty-second lens group U22 is from the twenty-first surface to the twenty-second surface, the third lens group U3 is from the twenty-fourth surface to the twenty-seventh surface, and the fourth lens group. U4 corresponds to the 28th to 33rd surfaces. The fifth lens unit U5 corresponds to the 34th to 41st surfaces. The first lens unit U1 includes a convex lens and a concave lens, and is composed of eight lenses as a whole. The twenty-first lens unit U21 includes three lenses including a convex lens and a concave lens as a whole, the twenty-second lens group U22 is one concave lens, the third lens group U3 is two convex lenses, and the fourth lens group U4 is a convex lens. It consists of three lenses as a whole, including a concave lens. The fifth lens unit U5 includes a convex lens and a concave lens, and is composed of five lenses as a whole.

  Table 1 shows values corresponding to the conditional expressions of this example. This embodiment satisfies the expressions (1), (2), and (5), and has a shooting angle of view (angle of view) of 78.6 ° at the wide angle end, a zoom ratio of 4.74, and a wide angle and high magnification. Achieving balance. In addition, a zoom lens that achieves both high optical performance, in which various aberrations are satisfactorily corrected throughout the entire zoom range, and a reduction in size and weight is achieved. Furthermore, a zoom lens that secures a sufficiently long back focus has been achieved.

As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

<Numerical Example 1>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 104.521 2.70 1.77250 49.6 53.31
2 30.315 14.58 43.72
3 -63.571 1.98 1.77250 49.6 42.74
4 199.025 3.89 42.69
5 74.494 3.29 1.89286 20.4 43.62
6 115.023 2.02 43.19
7 116.955 7.83 1.62041 60.3 43.08
8 -78.664 0.20 42.58
9 81.511 1.89 1.85478 24.8 39.04
10 36.329 6.64 1.49700 81.5 38.45
11 331.011 3.24 38.72
12 115.367 4.63 1.59522 67.7 40.06
13 -164.145 0.18 40.15
14 63.769 4.60 1.76385 48.5 39.86
15 875.792 (variable) 39.35
16 * 184.662 1.26 1.88300 40.8 23.79
17 25.638 3.57 22.18
18 -158.203 1.08 1.59522 67.7 22.31
19 28.243 3.98 1.85478 24.8 23.01
20 -926.470 3.00 23.05
21 -40.093 1.08 1.76385 48.5 23.07
22 -458.726 (variable) 23.78
23 (Aperture) ∞ (Variable) 24.60
24 37.250 4.66 1.59522 67.7 26.43
25 * 133.331 (variable) 26.35
26 118.893 5.48 1.49700 81.5 26.64
27 -53.600 0.18 26.72
28 40.924 1.49 2.00100 29.1 25.84
29 26.603 4.13 1.49700 81.5 24.75
30 116.236 (variable) 24.57
31 40.142 2.87 1.95906 17.5 24.71
32 95.191 1.49 2.00069 25.5 24.22
33 33.561 4.20 23.40
34 -770.312 3.44 1.48749 70.2 23.72
35 -41.561 0.18 23.92
36 395.833 6.22 1.49700 81.5 23.67
37 -24.801 1.68 1.95375 32.3 23.36
38 -124.306 45.29 24.06
Image plane ∞

Aspheric data 1st surface
K = 6.63182e + 000 A 4 = 8.41422e-008 A 6 = 4.05320e-011 A 8 = -6.76543e-013

16th page
K = 0.00000e + 000 A 4 = 2.77839e-007 A 6 = -1.12528e-009 A 8 = -1.24698e-012

25th page
K = 0.00000e + 000 A 4 = 6.24439e-006 A 6 = 6.92935e-010 A 8 = 1.01985e-012

Various data Zoom ratio 4.74
Wide angle Medium Telephoto focal length 19.00 40.00 90.00
F number 4.00 4.00 4.00
Half angle of view 39.30 21.24 9.80
Image height 15.55 15.55 15.55
Total lens length 219.66 219.66 219.66
BF 45.29 45.29 45.29

d15 0.96 20.17 29.68
d22 30.43 11.22 1.70
d23 9.15 11.65 1.71
d25 24.43 12.71 2.02
d30 1.76 10.97 31.60

Entrance pupil position 33.55 46.26 53.53
Exit pupil position -84.66 -66.56 -49.28
Front principal point position 49.77 71.96 57.88
Rear principal point position 26.29 5.29 -44.71

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 45.00 57.67 43.04 30.69
2 16 -22.80 13.97 3.67 -6.16
3 23 ∞ 0.00 0.00 -0.00
4 24 85.00 4.66 -1.11 -3.98
5 26 65.00 11.28 0.78 -6.41
6 31 -502.40 20.08 43.82 27.17

<Numerical Example 2>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 113.703 2.35 1.77250 49.6 67.99
2 22.597 16.64 44.28
3 73.335 1.90 1.58313 59.4 42.54
4 * 20.187 9.03 35.99
5 195.447 1.90 1.69680 55.5 35.65
6 36.621 4.90 34.16
7 52.226 1.90 1.59522 67.7 36.86
8 30.482 9.20 1.67270 32.1 37.64
9 -193.358 1.19 37.76
10 82.793 5.21 1.62041 60.3 37.69
11 -168.583 3.69 37.31
12 466.888 1.50 1.85478 24.8 34.98
13 26.287 7.31 1.49700 81.5 33.03
14 489.422 0.20 33.09
15 51.952 7.52 1.76385 48.5 33.30
16 -52.718 (variable) 32.77
17 18789.032 1.00 1.88300 40.8 18.53
18 19.460 2.95 16.68
19 -86.466 1.00 1.77250 49.6 16.42
20 80.818 1.00 16.19
21 40.320 1.00 1.49700 81.5 16.08
22 31.256 2.29 1.85478 24.8 16.39
23 -4187.237 (variable) 16.55
24 (Aperture) ∞ (Variable) 17.03
25 63.477 2.42 1.69680 55.5 17.52
26 317.373 (variable) 17.58
27 26.860 1.15 1.95375 32.3 17.79
28 17.290 0.18 17.23
29 17.166 5.97 1.48749 70.2 17.37
30 -63.521 (variable) 17.24
31 -51.444 1.15 1.88300 40.8 15.57
32 32.658 3.40 1.84666 23.8 16.39
33 -54.456 11.52 16.91
34 40.309 4.42 1.48749 70.2 21.04
35 -45.849 0.20 21.08
36 -110.756 1.30 1.95375 32.3 20.89
37 18.035 5.95 1.49700 81.5 20.84
38 -209.702 7.42 21.95
39 98.419 10.44 1.49700 81.5 27.80
40 -19.310 2.00 2.00100 29.1 28.79
41 * -26.367 39.94 31.15
Image plane ∞

Aspheric data 1st surface
K = -1.92284e + 000 A 4 = 7.15243e-006 A 6 = -3.60896e-009 A 8 = 1.30630e-012

4th page
K = -8.97019e-001 A 4 = 9.29083e-006 A 6 = 1.50655e-008 A 8 = -7.25000e-011

41st page
K = 2.73821e-001 A 4 = 9.23770e-007 A 6 = -1.89961e-009 A 8 = 4.87802e-014

Various data Zoom ratio 2.50
Wide angle Medium Telephoto focal length 10.00 16.00 25.00
F number 4.00 4.00 4.00
Half angle of view 57.26 44.19 31.88
Image height 15.55 15.55 15.55
Total lens length 221.23 221.23 221.23
BF 39.94 39.94 39.94

d16 0.90 17.67 23.26
d23 24.23 7.46 1.87
d24 0.99 9.70 1.36
d26 11.70 3.04 0.88
d30 2.27 2.23 12.73

Entrance pupil position 22.42 24.57 25.31
Exit pupil position -365.80 -412.19 -261.70
Front principal point position 32.17 40.00 48.24
Rear principal point position 29.94 23.94 14.94

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 22.35 74.42 36.29 51.30
2 17 -27.26 9.24 -1.08 -8.52
3 24 ∞ 0.00 0.00 -0.00
4 25 112.94 2.42 -0.35 -1.77
5 27 60.11 7.30 1.60 -3.32
6 31 93.44 47.81 48.37 20.31

<Numerical Example 3>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 77.840 2.35 1.77250 49.6 60.22
2 24.816 11.76 44.75
3 68.579 1.90 1.69680 55.5 43.52
4 30.958 7.80 38.99
5 1803.976 1.90 1.69680 55.5 38.58
6 43.664 4.77 37.11
7 47.797 5.20 1.85478 24.8 38.20
8 325.867 1.97 37.71
9 276.681 4.00 1.58913 61.1 36.86
10 -123.267 7.08 36.37
11 110.227 1.50 1.85478 24.8 32.15
12 28.053 7.76 1.49700 81.5 30.36
13 -257.186 0.20 29.89
14 60.724 6.97 1.72916 54.7 30.94
15 -59.258 (variable) 30.92
16 -123.189 1.00 1.88300 40.8 20.97
17 28.673 4.19 20.50
18 -48.415 1.00 1.49700 81.5 21.01
19 32.176 4.49 1.85478 24.8 22.90
20 339.179 (variable) 23.39
21 (Aperture) ∞ (Variable) 24.67
22 35.068 3.74 1.58313 59.4 26.37
23 * 172.032 1.50 26.27
24 116.367 2.25 1.58913 61.1 26.41
25 7449.101 (variable) 26.37
26 51.680 1.15 2.00 100 29.1 26.27
27 31.102 5.84 1.48749 70.2 25.64
28 -58.849 (variable) 25.52
29 97.635 2.74 1.95906 17.5 21.44
30 -82.427 1.15 2.00100 29.1 21.40
31 35.942 2.00 21.33
32 13153.664 1.00 1.77250 49.6 21.58
33 116.568 4.97 22.11
34 38.361 8.38 1.49700 81.5 28.06
35 -34.627 0.20 28.64
36 62.989 9.07 1.49700 81.5 28.05
37 -24.213 1.30 1.95375 32.3 27.29
38 -124.215 39.97 28.00
Image plane ∞

Aspheric data 1st surface
K = 2.66965e + 000 A 4 = 2.25957e-006 A 6 = -7.54880e-010 A 8 = 3.36155e-013

23rd page
K = 0.00000e + 000 A 4 = 7.47569e-006 A 6 = 2.44200e-009 A 8 = -5.21954e-012

Various data Zoom ratio 2.50
Wide angle Medium telephoto focal length 14.00 21.00 35.00
F number 2.80 2.80 2.80
Half angle of view 48.00 36.52 23.95
Image height 15.55 15.55 15.55
Total lens length 204.69 204.69 204.69
BF 39.97 39.97 39.97

d15 0.97 11.47 21.81
d20 24.08 13.57 3.23
d21 4.31 4.14 1.46
d25 12.52 5.89 0.87
d28 1.73 8.53 16.23

Entrance pupil position 26.93 29.64 32.53
Exit pupil position -96.56 -84.83 -76.75
Front principal point position 39.49 47.11 57.03
Rear principal point position 25.97 18.97 4.97

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 30.99 65.14 41.12 41.62
2 16 -25.00 10.68 0.59 -7.16
3 21 ∞ 0.00 0.00 -0.00
4 22 55.15 7.49 0.62 -4.70
5 26 89.96 6.99 2.53 -2.06
6 29 220.45 30.81 38.71 22.82

<Numerical Example 4>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 128.935 2.35 1.77250 49.6 69.29
2 29.953 14.53 51.92
3 183.038 1.90 1.69680 55.5 50.90
4 48.635 6.77 47.36
5 260.459 1.90 1.69680 55.5 47.01
6 81.421 2.13 46.18
7 53.022 3.96 1.89286 20.4 46.49
8 110.841 3.62 46.07
9 2448.062 4.71 1.60311 60.6 45.55
10 -95.719 10.03 45.06
11 99.367 1.50 1.85478 24.8 38.58
12 34.978 7.15 1.49700 81.5 36.72
13 -390.242 0.20 37.14
14 68.479 6.36 1.72916 54.7 38.40
15 -87.355 (variable) 38.34
16 -134.469 1.00 1.83481 42.7 24.19
17 28.990 3.96 21.82
18 -48.897 1.00 1.43875 94.9 21.49
19 28.571 2.75 1.85478 24.8 22.59
20 90.487 (variable) 22.69
21 (Aperture) ∞ (Variable) 23.17
22 37.945 3.07 1.58313 59.4 24.29
23 * 190.397 (variable) 24.28
24 37.781 1.15 2.00100 29.1 24.66
25 23.600 0.20 23.98
26 23.209 6.34 1.48749 70.2 24.22
27 -51.727 (variable) 24.21
28 -149.150 1.15 1.95375 32.3 18.95
29 31.213 2.14 1.95906 17.5 19.39
30 82.670 (variable) 19.56
31 353.127 4.78 1.49700 81.5 28.76
32 -39.407 0.20 29.30
33 107.693 4.74 1.48749 70.2 29.68
34 -95.608 0.20 29.61
35 -191.193 5.90 1.49700 81.5 29.46
36 -30.640 1.30 2.00100 29.1 29.24
37 -75.765 (variable) 29.99
Image plane ∞

Aspheric data 1st surface
K = -1.48632e-001 A 4 = 1.72630e-006 A 6 = -3.98149e-010 A 8 = 1.25577e-013

23rd page
K = 0.00000e + 000 A 4 = 5.70093e-006 A 6 = -1.44525e-009 A 8 = 1.28614e-011

Various data Zoom ratio 5.00
Wide angle Medium Telephoto focal length 14.00 30.00 70.00
F number 4.00 4.00 4.00
Half angle of view 48.00 27.39 12.52
Image height 15.55 15.55 15.55
Total lens length 238.99 238.99 238.99
BF 50.05 53.44 65.56

d15 0.83 21.04 39.72
d20 40.66 20.45 1.77
d21 0.81 0.81 0.81
d23 16.89 4.57 2.56
d27 5.42 17.75 19.76
d30 17.32 13.93 1.81
d37 50.05 53.44 65.56

Entrance pupil position 31.11 38.88 47.72
Exit pupil position -229.85 -126.84 -55.63
Front principal point position 44.41 63.89 77.28
Rear principal point position 36.05 23.43 -4.44

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 42.91 67.13 48.37 47.06
2 16 -25.14 8.71 1.07 -5.44
3 21 ∞ 0.00 0.00 -0.00
4 22 80.34 3.07 -0.48 -2.40
5 24 68.75 7.69 2.74 -2.43
6 28 -55.68 3.29 1.08 -0.58
7 31 55.64 17.12 2.58 -8.76

<Numerical example 5>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 83.563 2.35 1.77250 49.6 58.17
2 27.337 15.18 45.54
3 -166.877 1.90 1.69680 55.5 44.09
4 47.709 11.56 40.93
5 63.875 3.20 1.85478 24.8 41.74
6 108.599 2.02 41.41
7 122.048 5.76 1.61800 63.3 41.35
8 -106.548 4.20 41.05
9 64.857 1.50 1.85478 24.8 36.51
10 31.697 6.49 1.49700 81.5 34.35
11 488.411 4.23 34.12
12 73.885 5.63 1.69680 55.5 35.30
13 -97.027 (variable) 35.13
14 -88.399 1.00 1.83481 42.7 25.05
15 38.508 2.14 24.68
16 160.000 1.00 1.58913 61.1 24.93
17 66.741 2.69 25.27
18 -70.936 1.00 1.43875 94.9 25.47
19 44.719 3.49 1.85478 24.8 27.69
20 -6529.328 (variable) 27.98
21 (Aperture) ∞ (Variable) 29.01
22 42.299 1.00 1.61772 49.8 30.79
23 31.250 4.58 1.58313 59.4 30.67
24 * 2488.685 (variable) 30.65
25 58.833 1.15 2.00069 25.5 30.97
26 36.251 6.86 1.48749 70.2 30.35
27 -58.470 (variable) 30.30
28 167.178 3.88 1.95906 17.5 30.40
29 -55.345 1.15 2.00100 29.1 30.32
30 52.359 6.14 29.96
31 93.689 3.35 1.48749 70.2 32.66
32 -310.364 0.20 32.97
33 55.351 6.59 1.59522 67.7 33.81
34 -62.113 0.20 33.68
35 95.516 6.40 1.49700 81.5 31.75
36 -37.533 1.30 2.00069 25.5 30.98
37 180.913 39.88 30.56
Image plane ∞

Aspheric data 1st surface
K = 6.26870e-001 A 4 = 1.92464e-006 A 6 = 8.68699e-010 A 8 = -1.95854e-012 A10 = 2.74368e-015 A12 = -1.63707e-018 A14 = 2.27287e-022 A16 = 1.50949 e-025

24th page
K = -6.55067e + 004 A 4 = 4.53129e-006 A 6 = -2.92829e-010 A 8 = 5.25270e-013

Various data Zoom ratio 2.81
Wide angle Medium telephoto focal length 16.00 25.00 45.00
F number 2.80 2.80 2.80
Half angle of view 44.18 31.88 19.06
Image height 15.55 15.55 15.55
Total lens length 220.09 220.09 220.09
BF 39.88 39.88 39.88

d13 1.18 14.87 22.84
d20 24.09 10.40 2.43
d21 16.51 15.02 1.34
d24 18.79 13.74 9.17
d27 1.49 8.04 26.29

Entrance pupil position 30.08 34.17 36.50
Exit pupil position -154.22 -119.61 -76.76
Front principal point position 44.76 55.25 64.14
Rear principal point position 23.88 14.88 -5.12

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 41.06 64.02 46.35 44.00
2 14 -30.52 11.32 0.10 -8.61
3 21 ∞ 0.00 0.00 -0.00
4 22 75.00 5.58 -0.11 -3.61
5 25 90.00 8.01 3.19 -2.10
6 28 425.51 29.22 6.22 -12.41

<Numerical Example 6>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 134.239 3.20 1.77250 49.6 80.53
2 41.501 23.47 64.82
3 -83.617 2.70 1.77250 49.6 63.76
4 595.315 4.92 63.99
5 124.540 4.85 1.89286 20.4 65.04
6 542.396 2.01 64.75
7 891.609 7.62 1.59522 67.7 64.34
8 -103.942 7.03 63.97
9 1089.788 2.10 1.85478 24.8 57.74
10 66.895 9.54 1.49700 81.5 58.62
11 -378.166 0.20 59.25
12 210.995 4.45 1.49700 81.5 61.08
13 -629.084 0.20 61.42
14 145.928 9.06 1.59522 67.7 62.72
15 -119.124 0.20 62.74
16 66.144 4.45 1.76385 48.5 59.20
17 123.151 (variable) 58.61
18 * 214.375 1.40 1.88300 40.8 32.43
19 32.320 5.32 30.47
20 -136.253 1.20 1.59522 67.7 30.55
21 34.069 5.54 1.85478 24.8 31.48
22 -397.458 3.46 31.46
23 -49.569 1.20 1.76385 48.5 31.34
24 281.941 (variable) 32.32
25 (Aperture) ∞ (Variable) 32.99
26 51.039 3.92 1.59522 67.7 36.51
27 * 139.136 (variable) 36.50
28 108.640 5.45 1.49700 81.5 41.11
29 -136.833 0.20 41.18
30 79.210 1.66 2.00 100 29.1 40.75
31 46.824 8.11 1.49700 81.5 39.68
32 -99.285 (variable) 39.49
33 60.126 5.87 1.95906 17.5 34.25
34 -166.195 1.66 2.00069 25.5 33.36
35 33.049 2.95 31.18
36 33.456 7.69 1.48749 70.2 32.49
37 -77.237 0.20 32.29
38 92.545 7.28 1.49700 81.5 31.04
39 -36.721 1.87 1.95375 32.3 30.01
40 189.601 39.99 29.68
Image plane ∞

Aspheric data 1st surface
K = 3.48651e + 000 A 4 = 1.59139e-007 A 6 = 1.90332e-011 A 8 = -4.47085e-014

18th page
K = 0.00000e + 000 A 4 = 3.24271e-007 A 6 = -2.92296e-011 A 8 = -8.99730e-013

27th page
K = 0.00000e + 000 A 4 = 3.14085e-006 A 6 = 1.30590e-010 A 8 = -2.00080e-013

Various data Zoom ratio 7.06
Wide angle Medium telephoto focal length 17.00 50.00 120.00
F number 2.80 2.80 3.60
Half angle of view 42.45 17.27 7.38
Image height 15.55 15.55 15.55
Total lens length 300.05 300.05 300.05
BF 39.99 39.99 39.99

d17 1.17 31.16 41.24
d24 41.84 11.85 1.77
d25 13.02 13.42 1.89
d27 40.21 22.33 4.82
d32 12.85 30.34 59.38

Entrance pupil position 46.69 68.71 78.09
Exit pupil position -186.88 -96.87 -64.64
Front principal point position 62.42 100.45 60.47
Rear principal point position 22.99 -10.01 -80.01

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 53.03 85.98 58.93 39.17
2 18 -25.25 18.12 5.44 -7.10
3 25 ∞ 0.00 0.00 -0.00
4 26 132.74 3.92 -1.40 -3.82
5 28 67.92 15.41 4.20 -6.13
6 33 -324.09 27.52 54.51 31.46

<Numerical Example 7>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 95.906 2.70 1.77250 49.6 52.12
2 30.349 14.15 42.97
3 -62.227 1.98 1.79952 42.2 41.78
4 180.947 0.28 41.52
5 69.713 2.97 1.89286 20.4 41.79
6 93.661 2.00 41.31
7 95.036 7.06 1.59522 67.7 41.23
8 -76.951 0.15 40.85
9 66.914 1.89 1.85478 24.8 37.79
10 37.821 3.46 1.49700 81.5 35.73
11 60.427 3.68 35.04
12 76.256 5.37 1.59522 67.7 36.89
13 -129.240 0.18 37.14
14 52.144 4.40 1.76385 48.5 37.37
15 254.740 (variable) 36.89
16 * -412.116 1.26 1.88300 40.8 23.86
17 30.078 3.71 22.51
18 -83.197 1.08 1.59522 67.7 22.77
19 38.774 3.97 1.85478 24.8 23.98
20 -149.522 2.27 24.26
21 -60.042 1.08 1.76385 48.5 24.54
22 1372.603 (variable) 25.23
23 (Aperture) ∞ (Variable) 26.93
24 * 62.152 3.26 1.51633 64.1 28.54
25 389.353 1.00 28.94
26 286.095 2.58 1.48749 70.2 29.32
27 -500.000 (variable) 29.71
28 146.025 4.10 1.49700 81.5 30.49
29 -89.281 0.18 30.69
30 46.352 1.49 2.00100 29.1 31.43
31 33.165 0.50 30.74
32 33.206 6.00 1.49700 81.5 31.05
33 -204.969 (variable) 31.01
34 40.973 3.90 1.95906 17.5 30.42
35 368.689 1.49 2.00069 25.5 29.86
36 27.667 (variable) 27.72
37 28.197 6.18 1.48749 70.2 28.66
38 -155.495 0.18 28.32
39 46.760 5.09 1.49700 81.5 27.16
40 -78.080 1.68 1.95375 32.3 26.23
41 27.832 1.91 24.69
42 41.980 3.47 1.48749 70.2 25.11
43 336.276 39.97 25.24
Image plane ∞

Aspheric data 1st surface
K = 5.79245e + 000 A 4 = 8.63641e-008 A 6 = 2.25702e-010 A 8 = -8.35034e-013

16th page
K = 0.00000e + 000 A 4 = 1.72589e-006 A 6 = -3.68621e-009 A 8 = 3.39175e-012

24th page
K = 0.00000e + 000 A 4 = -4.00518e-006 A 6 = 3.28035e-009 A 8 = -2.56707e-012

Various data Zoom ratio 4.74
Wide angle Medium Telephoto focal length 19.00 40.00 90.00
F number 4.00 4.00 4.00
Half angle of view 39.30 21.24 9.80
Image height 15.55 15.55 15.55
Total lens length 230.00 230.00 230.00
BF 39.97 39.97 39.97

d15 1.43 21.22 32.97
d22 34.78 14.99 3.24
d23 1.51 1.51 1.51
d27 40.65 26.00 1.99
d33 1.73 15.81 38.13
d36 3.29 3.86 5.54

Entrance pupil position 33.31 46.57 55.74
Exit pupil position -103.58 -63.48 -47.07
Front principal point position 49.80 71.11 52.67
Rear principal point position 20.97 -0.03 -50.03

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 58.01 50.26 44.81 33.40
2 16 -23.88 13.37 2.43 -7.06
3 23 ∞ 0.00 0.00 -0.00
4 24 103.76 6.84 0.76 -4.15
5 28 56.28 12.27 2.84 -5.43
6 34 -96.83 5.39 9.60 6.26
7 37 170.80 18.51 -28.67 -36.09

<Numerical Example 8>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 99.898 2.70 1.77250 49.6 53.20
2 29.917 14.55 43.56
3 -65.290 1.98 1.79952 42.2 42.52
4 135.585 0.28 42.38
5 65.783 4.00 1.89286 20.4 42.87
6 94.748 2.02 42.29
7 97.634 8.36 1.58913 61.1 42.31
8 -70.877 0.18 41.85
9 66.062 1.89 1.85478 24.8 38.69
10 35.191 4.40 1.49700 81.5 36.83
11 72.331 3.34 36.43
12 78.941 5.19 1.59522 67.7 38.20
13 -150.082 0.18 38.40
14 53.548 4.56 1.76385 48.5 38.62
15 679.842 (variable) 38.25
16 * 841.829 1.26 1.88300 40.8 24.42
17 26.179 3.85 22.37
18 -96.185 1.08 1.59522 67.7 22.59
19 30.046 4.24 1.85478 24.8 23.79
20 -269.880 2.68 23.96
21 -48.855 1.08 1.76385 48.5 24.15
22 1984.051 (variable) 24.93
23 44.357 3.27 1.59522 67.7 27.02
24 * 151.463 (variable) 27.17
25 (Aperture) ∞ (Variable) 28.37
26 74.652 4.81 1.49700 81.5 29.11
27 -76.289 0.18 29.24
28 44.024 1.49 2.00100 29.1 28.86
29 28.957 5.87 1.49700 81.5 27.84
30 -160.652 (variable) 27.56
31 42.316 2.41 1.95906 17.5 22.77
32 104.687 1.49 2.00069 25.5 22.37
33 31.942 18.36 21.59
34 71.905 5.58 1.49700 81.5 24.37
35 -29.860 1.68 2.00100 29.1 24.35
36 -89.165 39.95 25.08
Image plane ∞

Aspheric data 1st surface
K = 5.68145e + 000 A 4 = 2.72649e-007 A 6 = 1.02630e-010 A 8 = -6.89945e-013

16th page
K = 0.00000e + 000 A 4 = 1.18094e-006 A 6 = -2.36052e-009 A 8 = 1.32385e-015

24th page
K = 0.00000e + 000 A 4 = 5.98096e-006 A 6 = -9.26771e-010 A 8 = -5.22395e-014

Various data Zoom ratio 4.74
Wide angle Medium Telephoto focal length 19.00 40.00 90.00
F number 4.00 4.00 4.00
Half angle of view 39.30 21.24 9.80
Image height 15.55 15.55 15.55
Total lens length 220.03 220.03 220.03
BF 39.95 39.95 39.95

d15 1.04 19.68 29.57
d22 29.48 14.58 1.75
d24 5.53 1.79 4.73
d25 29.07 19.76 0.97
d30 1.98 11.30 30.09

Entrance pupil position 33.20 47.10 57.66
Exit pupil position -86.90 -66.42 -54.93
Front principal point position 49.36 72.06 62.30
Rear principal point 20.95 -0.05 -50.05

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 48.50 53.64 42.62 30.34
2 16 -21.50 14.19 3.11 -6.82
3 23 103.83 3.27 -0.84 -2.86
4 25 ∞ 0.00 0.00 -0.00
5 26 46.70 12.35 2.40 -5.76
6 31 -183.82 29.53 8.09 -17.14

<Numerical Example 9>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 199.573 3.20 1.77250 49.6 64.23
2 47.727 21.73 55.55
3 -101.417 2.70 1.77250 49.6 50.12
4 218.492 0.23 49.61
5 104.813 5.00 1.80809 22.8 49.70
6 -530.991 2.00 49.43
7 1790.657 4.94 1.59522 67.7 48.29
8 -103.572 7.26 48.17
9 416.430 2.10 1.85478 24.8 43.86
10 55.581 7.07 1.49700 81.5 42.35
11 -257.500 0.15 42.08
12 104.270 4.90 1.49700 81.5 42.20
13 -225.293 0.15 42.28
14 75.320 4.77 1.72916 54.7 42.19
15 -459.857 (variable) 41.86
16 * -1679.002 1.40 1.88300 40.8 26.37
17 29.493 3.95 23.60
18 -549.195 1.20 1.59522 67.7 22.81
19 28.249 4.29 1.85478 24.8 21.64
20 -332.249 2.92 21.64
21 -39.677 1.20 1.76385 48.5 21.53
22 393.426 (variable) 22.12
23 (Aperture) ∞ (Variable) 25.52
24 47.914 3.28 1.59522 67.7 33.37
25 * 106.481 (variable) 33.31
26 124.675 5.43 1.49700 81.5 36.01
27 -83.443 0.20 36.11
28 115.151 1.66 2.00069 25.5 35.57
29 59.046 5.71 1.49700 81.5 34.90
30 -102.432 (variable) 34.74
31 76.292 3.70 1.95906 17.5 27.67
32 -65.732 1.66 2.00069 25.5 27.42
33 36.085 4.57 26.10
34 35.994 8.27 1.43875 94.9 27.63
35 -26.859 1.87 1.88300 40.8 27.55
36 -64.356 45.27 28.53
Image plane ∞

Aspheric data 16th surface
K = -5.41916e + 002 A 4 = 2.05800e-006 A 6 = -8.75128e-010 A 8 = -1.60841e-012

25th page
K = 0.00000e + 000 A 4 = 3.50176e-006 A 6 = 1.15409e-010 A 8 = -2.29043e-013

Various data Zoom ratio 10.00
Wide angle Medium Tele focal length 22.00 70.02 220.00
F number 4.00 4.00 8.00
Half angle of view 35.25 12.52 4.04
Image height 15.55 15.55 15.55
Total lens length 290.22 290.22 290.22
BF 45.27 45.27 45.27

d15 0.80 28.69 40.38
d22 41.22 13.33 1.64
d23 23.40 20.73 1.11
d25 30.20 15.02 1.54
d30 31.83 49.69 82.78

Entrance pupil position 45.70 76.30 95.14
Exit pupil position -177.84 -109.14 -79.30
Front principal point position 65.53 114.57 -73.42
Rear principal point position 23.27 -24.75 -174.73

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 54.00 66.20 50.99 25.96
2 16 -22.42 14.95 4.08 -6.17
3 23 ∞ 0.00 0.00 -0.00
4 24 142.85 3.28 -1.65 -3.66
5 26 68.27 13.00 3.82 -4.80
6 31 -200.58 20.07 1.09 -13.30

<Numerical Example 10>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 144.538 2.85 1.77250 49.6 51.01
2 37.247 11.10 44.20
3 -102.691 2.38 1.77250 49.6 43.50
4 194.836 5.10 43.16
5 82.821 4.23 1.85478 24.8 43.64
6 652.055 1.19 43.28
7 144.761 5.33 1.59522 67.7 42.46
8 -126.425 7.08 41.80
9 144.229 1.90 1.85478 24.8 35.67
10 42.161 5.32 1.49700 81.5 33.82
11 188.338 0.47 33.23
12 92.559 4.67 1.59522 67.7 32.96
13 -111.501 0.19 32.40
14 47.013 4.25 1.58913 61.1 31.86
15 307.335 (variable) 31.22
16 * -60798.810 1.33 1.88300 40.8 21.51
17 25.245 2.71 19.27
18 207.761 1.14 1.53775 74.7 18.68
19 24.750 3.04 1.85478 24.8 18.96
20 133.621 4.28 18.87
21 -33.039 1.14 1.53775 74.7 18.89
22 159.777 (variable) 19.48
23 (Aperture) ∞ (Variable) 20.07
24 47.858 3.05 1.58313 59.4 21.11
25 * 1474.678 (variable) 21.26
26 46.226 3.69 1.49700 81.5 21.87
27 -156.528 0.19 22.07
28 69.175 1.57 1.88300 40.8 22.19
29 26.432 4.74 1.49700 81.5 21.85
30 -94.711 (variable) 22.02
31 44.613 1.57 1.48749 70.2 22.33
32 26.917 10.18 21.95
33 140.562 4.92 1.43875 94.9 23.77
34 -30.637 1.78 1.88300 40.8 23.97
35 -57.531 49.51 24.75
Image plane ∞

Aspheric data 16th surface
K = -3.51290e + 008 A 4 = 2.19875e-006 A 6 = -1.30354e-009 A 8 = -4.81192e-012

25th page
K = 0.00000e + 000 A 4 = 4.55231e-006 A 6 = 1.08190e-010 A 8 = -8.44991e-013

Various data Zoom ratio 5.00
Wide angle Medium Telephoto focal length 24.00 55.00 120.00
F number 5.60 5.60 5.60
Half angle of view 32.94 15.79 7.38
Image height 15.55 15.55 15.55
Total lens length 220.04 220.04 220.04
BF 49.51 49.51 49.51

d15 1.40 18.41 24.99
d22 25.37 8.36 1.78
d23 11.03 10.77 1.42
d25 22.81 12.68 0.50
d30 8.52 18.91 40.45

Entrance pupil position 39.05 55.48 62.79
Exit pupil position -123.27 -88.95 -66.57
Front principal point position 59.72 88.64 58.73
Rear principal point position 25.51 -5.49 -70.49

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 46.00 56.05 41.14 19.75
2 16 -20.00 13.64 3.98 -5.79
3 23 ∞ 0.00 0.00 -0.00
4 24 84.42 3.05 -0.06 -1.98
5 26 58.32 10.20 1.52 -5.26
6 31 -394.26 18.46 -18.11 -35.67

<Numerical Example 11>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 78.796 2.35 1.77250 49.6 61.22
2 30.245 19.27 49.77
3 -66.908 1.90 1.72916 54.7 48.91
4 127.672 1.80 49.29
5 78.337 5.48 1.84666 23.8 50.65
6 1181.435 1.19 50.46
7 870.713 6.87 1.59522 67.7 50.22
8 -71.173 8.04 49.95
9 -72.063 5.10 1.48749 70.2 42.81
10 -37.378 1.50 1.85478 24.8 42.35
11 -49.740 0.20 42.62
12 87.378 1.50 1.85478 24.8 37.70
13 40.514 6.38 1.49700 81.5 37.18
14 1833.504 0.20 37.35
15 63.701 5.57 1.76385 48.5 37.77
16 -294.752 (variable) 37.37
17 246.226 1.00 1.59522 67.7 26.86
18 46.163 3.69 24.85
19 -79.103 1.00 1.49700 81.5 24.67
20 27.826 4.20 1.85478 24.8 24.64
21 185.220 1.19 24.30
22 -101.517 1.00 1.88300 40.8 24.28
23 53.663 (variable) 24.23
24 (Aperture) ∞ (Variable) 24.83
25 41.591 1.00 1.85478 24.8 26.67
26 31.100 4.26 1.59282 68.6 26.47
27 * 353.621 (variable) 26.52
28 46.718 1.15 1.85478 24.8 27.85
29 35.817 5.97 1.48749 70.2 27.82
30 -64.682 (variable) 28.14
31 37.254 3.28 1.95906 17.5 28.62
32 141.175 1.15 2.00069 25.5 28.20
33 26.308 (variable) 26.73
34 34.396 5.26 1.48749 70.2 28.93
35 -261.226 0.20 28.93
36 45.385 1.00 1.90366 31.3 28.75
37 24.440 4.75 1.49700 81.5 27.73
38 49.020 6.22 27.54
39 -26.774 4.23 1.49700 81.5 27.61
40 -21.898 1.00 1.69680 55.5 28.91
41 -28.921 47.77 30.28
Image plane ∞

Aspheric data 1st surface
K = -1.92711e + 000 A 4 = 1.29364e-006 A 6 = 2.52635e-011 A 8 = -3.53242e-014 A10 = 4.47343e-016 A12 = -5.62580e-019 A14 = 2.49738e-022 A16 = -3.18391e-026

27th page
K = 0.00000e + 000 A 4 = 3.93101e-006 A 6 = 1.31088e-009 A 8 = 3.86330e-013

Various data Zoom ratio 3.04
Wide angle Medium Tele focal length 28.00 45.00 85.00
F number 4.00 4.00 4.00
Half angle of view 37.69 25.67 14.28
Image height 21.63 21.63 21.63
Total lens length 230.06 230.06 230.06
BF 47.77 47.77 47.77

d16 0.99 15.35 25.71
d23 28.12 16.56 2.91
d24 5.00 5.48 2.46
d27 22.57 12.46 0.83
d30 1.75 6.03 16.38
d33 4.96 7.52 15.11

Entrance pupil position 39.61 47.81 51.06
Exit pupil position -79.06 -65.49 -65.22
Front principal point position 61.43 74.93 72.12
Rear principal point position 19.77 2.77 -37.23

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 50.35 67.34 50.39 35.70
2 17 -28.30 12.08 6.38 -2.12
3 24 ∞ 0.00 0.00 -0.00
4 25 94.19 5.26 -0.95 -4.12
5 28 65.01 7.12 1.87 -2.87
6 31 -102.06 4.43 8.71 5.97
7 34 125.27 22.67 -4.70 -22.45

<Numerical Example 12>
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 90.018 2.43 1.77250 49.6 50.18
2 29.155 14.22 41.53
3 -54.305 1.78 1.79952 42.2 40.38
4 122.610 0.14 40.48
5 70.338 2.99 1.89286 20.4 40.93
6 118.582 1.59 40.70
7 104.039 7.42 1.59522 67.7 40.81
8 -66.784 0.17 40.55
9 67.246 1.70 1.85478 24.8 37.19
10 36.249 4.20 1.49700 81.5 35.68
11 70.880 3.18 36.03
12 88.009 5.60 1.59522 67.7 37.72
13 -104.103 0.16 38.04
14 52.994 4.79 1.76385 48.5 38.39
15 608.171 (variable) 37.94
16 * 508.798 1.13 1.88300 40.8 23.98
17 26.562 4.25 22.39
18 -61.676 0.97 1.59522 67.7 22.61
19 38.656 3.62 1.85478 24.8 23.90
20 -290.093 (variable) 24.17
21 -44.416 0.97 1.59522 67.7 24.78
22 -225.471 (variable) 25.68
23 (Aperture) ∞ (Variable) 26.78
24 * 82.314 3.30 1.51633 64.1 28.06
25 -376.727 0.90 28.55
26 257.485 2.59 1.48749 70.2 29.09
27 -450.000 (variable) 29.45
28 98.474 4.44 1.49700 81.5 30.30
29 -93.631 0.16 30.70
30 52.574 1.34 2.00100 29.1 31.21
31 35.362 0.45 30.61
32 34.832 5.71 1.49700 81.5 30.92
33 -359.393 (variable) 30.89
34 172.943 1.34 2.00100 29.1 30.68
35 38.007 3.15 1.95906 17.5 30.21
36 82.821 14.20 30.06
37 -240.951 4.03 1.58913 61.1 31.82
38 -46.688 0.16 32.06
39 57.168 7.52 1.49700 81.5 30.96
40 -35.265 1.52 2.00100 29.1 30.32
41 -6190.993 49.53 30.37
Image plane ∞

Aspheric data 1st surface
K = 5.13319e + 000 A 4 = 1.30284e-007 A 6 = 6.56299e-011 A 8 = -1.04805e-012

16th page
K = 0.00000e + 000 A 4 = 1.42898e-006 A 6 = -4.50847e-009 A 8 = 3.50934e-012

24th page
K = 0.00000e + 000 A 4 = -3.52306e-006 A 6 = 3.74831e-009 A 8 = -2.64711e-012

Various data Zoom ratio 4.74
Wide angle Medium Telephoto focal length 19.00 40.00 90.00
F number 4.00 4.00 4.00
Half angle of view 39.30 21.25 9.80
Image height 15.55 15.55 15.55
Total lens length 240.58 240.58 240.58
BF 49.53 49.53 49.53

d15 1.09 20.04 30.31
d20 10.25 2.90 3.79
d22 24.37 12.77 1.62
d23 1.23 1.23 1.23
d27 39.96 27.32 1.98
d33 2.00 14.63 39.97

Entrance pupil position 32.12 44.43 52.82
Exit pupil position -265.20 -132.66 -83.51
Front principal point position 49.98 75.64 81.94
Rear principal point position 30.53 9.55 -40.47

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 50.50 50.39 42.19 31.15
2 16 -32.24 9.97 0.22 -7.31
3 21 -92.79 0.97 -0.15 -0.76
4 23 ∞ 0.00 0.00 -0.00
5 24 94.70 6.80 1.33 -3.52
6 28 59.84 12.10 2.40 -5.73
7 34 -1860.86 31.92 -41.59 -66.77

U1 1st lens group U2 2nd lens group U3 3rd lens group U4 4th lens group U5 5th lens group (rear group)
SP Aperture stop

Claims (9)

In order from the object side to the image side, a first lens group having a positive refractive power, a second lens group, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and at least one lens group. A zoom lens having a rear group including
The second lens group includes one or more sub-lens groups and has a negative refractive power as a whole;
The first lens group does not move for zooming, the second lens group moves during zooming, and at least the fourth lens group among the third lens group, the fourth lens group, and the rear group Move during zooming,
A diaphragm between the second lens group and the third lens group or between the third lens group and the fourth lens group;
The lateral magnifications of the second lens group at the wide-angle end and the telephoto end when the light beam enters from infinity are β2w and β2t, respectively, and the focal lengths at the wide-angle end and the telephoto end of the zoom lens are fw and ft, respectively. When the focal length of the lens group is f1, and the focal length at the wide angle end of the second lens group is f2,
0.50 <(ft × β2w ² ) / (fw × β2t ² ) <1.40
-2.45 <f1 / f2 <−0.50
A zoom lens characterized by satisfying   The zoom lens according to claim 1, wherein the stop does not move in the optical axis direction for zooming. When the third lens group and the fourth lens group move during zooming, and the focal lengths of the third lens group and the fourth lens group are f3 and f4,
0.40 <f3 / f4 <2.50
The zoom lens according to claim 1, wherein: When the distance between the third lens group and the fourth lens group at the wide-angle end and the telephoto end is L34w and L34t,
0.01 <L34t / L34w <0.60
The zoom lens according to claim 3, wherein:   The zoom lens according to claim 1, wherein the rear group does not move for zooming. The first lens group includes, in order from the object side to the image side, an eleventh lens group having a negative refractive power that does not move for focusing, a twelfth lens group having a positive refractive power that moves during focusing, and a positive refractive power. When the focal length of the eleventh lens group and the twelfth lens group is f11,
−1.5 <f11 / f1 <−0.4
The zoom lens according to claim 1, wherein:   The zoom lens according to claim 1, wherein the rear group includes three or more lenses.   The zoom lens according to claim 1, wherein the second lens group includes two sub lens groups that move along different paths during zooming.   An image pickup apparatus comprising: the zoom lens according to claim 1; and a solid-state image pickup device that receives an image formed by the zoom lens.

Images