JP6175903B2 - Imaging lens, imaging device, and portable terminal - Google Patents

Description

  The present invention relates to an imaging lens, an imaging device, and a portable terminal including the imaging lens using a solid-state imaging device such as a CCD image sensor or a CMOS image sensor.

  In recent years, with the widespread use of mobile terminals equipped with imaging devices using solid-state imaging devices such as CCD image sensors and CMOS image sensors, imaging with a high pixel count so that higher quality images can be obtained A device equipped with an imaging device using an element has been supplied to the market. Conventional general imaging devices having a high number of pixels have been accompanied by an increase in size, but in recent years, the miniaturization of pixels has progressed and the imaging devices have become smaller. An imaging lens used for such a miniaturized imaging device is required to have a high resolving power, but the resolving power is limited by the F number, and a bright lens with a small F number can obtain a high resolving power. As described above, sufficient performance cannot be obtained with an F-number of about F2.8. Accordingly, there has been a demand for a bright imaging lens having a size of F2.4 or less, which is suitable for an imaging device with high pixels, miniaturization, and miniaturization. As an imaging lens for such an application, a six-lens imaging lens has been proposed that can have a larger aperture ratio and higher performance than a four- or five-lens configuration.

  As a six-lens imaging lens, a first lens having a positive refractive power, a second lens having a negative refractive power, an aperture stop, a third lens having a positive refractive power, and a negative refractive power in order from the object side. An imaging lens including a fourth lens having a fifth lens having a positive refractive power and a sixth lens having a negative refractive power is disclosed in Patent Document 1, for example.

JP 2012-155223 A US Patent Publication No. 2012/0188654

  However, the imaging lens described in Patent Document 1 has an aperture stop disposed behind the second lens, and in order to ensure good telecentric characteristics, the entire length of the imaging lens must be increased and the size of the imaging lens can be reduced. Not suitable for.

  Further, in a configuration similar to that of Patent Document 1, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, and positive refraction in order from the object side. For example, Patent Document 2 discloses an imaging lens including a fourth lens having power, a fifth lens having positive refractive power, and a sixth lens having negative refractive power.

  However, it cannot be said that the imaging lens described in Patent Document 2 is sufficiently small because of insufficient aberration correction. Further, it is a dark imaging lens with an F number of F2.8, and it has not been able to cope with the recent increase in pixels and performance.

  The present invention has been made in view of such problems, and has a six-image structure having a brightness of F2.4 or less, in which various aberrations are well corrected while being smaller than the conventional type. An object is to provide a lens, an imaging device using the lens, and a portable terminal.

Here, although it is a scale of a small imaging lens, the present invention aims at miniaturization at a level satisfying the following expression. By satisfying this range, the entire imaging apparatus can be reduced in size and weight.
L / 2Y <0.90 (13)
However,
L: Distance on the optical axis from the lens surface closest to the object side to the image-side focal point of the entire imaging lens system 2Y: diagonal length of the imaging surface of the solid-state imaging device (diagonal length of the rectangular effective pixel region of the solid-state imaging device)

Here, the image-side focal point refers to an image point when parallel light rays parallel to the optical axis are incident on the imaging lens. When a parallel plate such as an optical low-pass filter, an infrared cut filter, or a seal glass of a solid-state image sensor package is disposed between the image-side surface of the imaging lens and the image-side focal position, the imaging lens is parallel. The flat plate portion is calculated as the above L value after the air conversion distance. More preferably, the range of the following formula is good.
L / 2Y <0.80 (13) '

The imaging lens according to claim 1 is an imaging lens for forming a subject image on a photoelectric conversion unit of a solid-state imaging device,
From the object side,
A first lens having a positive refractive power and having a convex surface facing the object side in the vicinity of the optical axis and both surfaces being aspherical;
A second lens having negative refractive power and having a concave surface facing the image side in the vicinity of the optical axis
A third lens having a positive refractive power ;
A fourth lens having negative refractive power ;
A fifth lens having a positive refractive power ;
A sixth lens having negative refractive power and having a concave surface facing the image side in the vicinity of the optical axis,
An aperture stop is disposed on the object side of the first lens or between the first lens and the second lens;
The image side surface of the sixth lens is aspheric, and has an extreme value at a position other than the intersection with the optical axis,
The following conditional expression is satisfied.
0.66 ≦ DEV2S1 / EDiaS1 ≦ 0.97 (1)
0.48 <DEV1S2 / EDiaS2 <0.97 (2)
0.60 <f1 × tan ω / Y <0.95 (3)
−0.60 <f6 × tan ω / Y ≦ −0.43 (4)
However,
DEV2S1: Distance (mm) from the optical axis at the position where the value of the second derivative of the first lens object side surface sag amount becomes the maximum value within the effective diameter.
EdiaS1: Effective radius (mm) of the side surface of the first lens object
DEV1S2: Distance (mm) from the optical axis at the position where the value of the first derivative of the first lens image side surface sag amount is the maximum value within the effective diameter.
EdiaS2: Effective radius (mm) of the side surface of the first lens
f1: Focal length (mm) of the first lens
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens
f6: Focal length (mm) of the sixth lens

  The basic configuration of the present invention for obtaining a compact imaging lens with good aberration correction is, in order from the object side, having a positive refractive power, with the convex surface facing the object side near the optical axis, and both surfaces are aspherical The first lens having a negative refractive power and having a concave surface facing the image side in the vicinity of the optical axis, the third lens, the fourth lens, and the fifth lens, having a negative refractive power and in the vicinity of the optical axis And a sixth lens having a concave surface facing the image side. This lens configuration of a so-called telephoto type in which a positive lens group including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens and a negative sixth lens are arranged in this order from the object side. This is an advantageous configuration for reducing the overall length of the imaging lens.

  In addition, by using two or more negative lenses in the six-lens configuration, it is possible to easily correct the Petzval sum by increasing the surface having a diverging action, and to secure an excellent imaging performance up to the periphery of the screen. Can be obtained. Furthermore, by making the object side surface of the first lens convex, the combined principal point position of the entire imaging lens system can be moved closer to the object side, which is advantageous in reducing the overall length of the imaging lens.

  Further, by making the image side surface of the sixth lens disposed closest to the image side an aspherical surface, various aberrations at the peripheral portion of the screen can be corrected satisfactorily. Furthermore, the aspherical shape having an extreme value at a position other than the intersection with the optical axis makes it easy to ensure the telecentric characteristics of the image-side light beam.

  Here, the “extreme value” is a point on the aspheric surface where the tangent plane of the aspheric vertex is a plane perpendicular to the optical axis in the curve of the lens cross-sectional shape within the effective radius.

  Further, by arranging the aperture stop on the object side or the image side of the first lens, it is possible to achieve both reduction in the overall length of the imaging lens and good telecentric characteristics.

  Conditional expressions (1) and (2) define the peripheral shape of the first lens and are conditional expressions for appropriately controlling the spherical aberration shape of the imaging lens.

  Referring to FIG. 1, in an optical system having a short imaging lens total length, a spherical aberration is shaped so as to tilt in the minus direction, and the curvature of field is also shaped so as to fall in the minus direction accordingly. In general, so-called underbalance is used to correct the surface curvature well. However, in a bright optical system with a small F-number, the entrance pupil diameter tends to increase in order to capture more subject light. Therefore, in order to underbalance, the spherical surface at the periphery of the entrance pupil that is further away from the optical axis. There is a possibility that the aberration will fall to the negative side too much and the image surface property will be deteriorated.

  Therefore, by setting the peripheral shape of the first lens closest to the aperture stop, which has a large influence on spherical aberration, within the range of conditional expressions (1) and (2), an optical system with a small F-number and a bright optical system can be used. It becomes possible to appropriately control the spherical aberration shape. Here, the “maximum value of the first derivative of the sag amount” means the maximum value of the inclination of the lens cross-sectional shape curve within the effective radius, and the “maximum value of the second derivative of the sag amount” It means the maximum value of change in slope. That is, the shape of the peripheral portion on the object side surface of the first lens is closer to the concave shape than the optical axis side, and the shape of the peripheral portion on the image side surface is closer to the convex shape than the optical axis side. Therefore, by setting the conditional expressions (1) and (2) within a predetermined range, the position of the peripheral portion where the shape of the first lens approaches the meniscus shape with the convex surface facing the image side is specified, and the spherical aberration at the peripheral portion of the entrance pupil Can be made to go from the minus side to the plus side. Specifically, since the values of the conditional expressions (1) and (2) exceed the lower limit, the underbalance can be appropriately set, so that the field curvature of the peripheral light beam can be corrected well. On the other hand, when the values of conditional expressions (1) and (2) are below the upper limit, it is possible to suppress the spherical aberration of the entrance pupil peripheral portion from falling too much in the negative direction.

  Furthermore, by satisfying conditional expressions (3) and (4), it is possible to achieve both shortening of the entire length of the imaging lens and correction of aberration. Specifically, when the value of conditional expression (3) is less than the upper limit, the refractive power of the first lens can be appropriately maintained, and the composite principal point of the first lens to the fifth lens is further moved to the object side. It can arrange | position and can shorten the imaging lens full length. On the other hand, when the value of conditional expression (3) exceeds the lower limit, the refractive power of the first lens does not become unnecessarily large, and high-order spherical aberration and coma generated in the first lens are suppressed to a small level. Can do.

  Furthermore, when the value of conditional expression (4) exceeds the lower limit, the negative refractive power of the sixth lens can be maintained moderately, it is easy to secure the back focus, and axial chromatic aberration is corrected well. be able to. On the other hand, when the value of conditional expression (4) is below the upper limit, the negative refractive power of the sixth lens does not become too strong, and the entire length of the imaging lens can be shortened.

Further, conditional expressions (1) to (4) are more preferably in the range of the following expressions.
0.67 <DEV2S1 / EDiaS1 <0.92 (1) '
0.48 <DEV1S2 / EDiaS2 <0.82 (2) '
0.74 <f1 × tan ω / Y <0.94 (3) ′
−0.58 <f6 × tan ω / Y <−0.43 (4) ′

The imaging lens described in claim 2 is characterized in that, in the invention described in claim 1, the following conditional expression is satisfied.
-1.9 <f2 × tan ω / Y <−1.0 (5)
However,
f2: Focal length (mm) of the second lens
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens

Conditional expression (5) is a conditional expression for appropriately setting the focal length of the second lens. When the value of conditional expression (5) is less than the upper limit, the negative refractive power of the second lens does not become excessively strong, and the coma and distortion at the peripheral portion can be reduced. On the other hand, when the value of conditional expression (5) exceeds the lower limit, the negative refracting power of the second lens can be appropriately maintained, which is effective in reducing Petzval sum and correcting field curvature. More preferably, the range of the following formula is good.
−1.75 <f2 × tan ω / Y <−1.28 (5) ′

The imaging lens described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the following conditional expression is satisfied.
1.5 <f3 × tan ω / Y <7.5 (6)
However,
f3: Focal length (mm) of the third lens
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens

Conditional expression (6) is a conditional expression for appropriately setting the focal length of the third lens. When the value of conditional expression (6) is below the upper limit, the refractive power of the third lens can be maintained moderately, and the so-called triplet effect in which the first lens to the third lens are arranged in order of positive and negative. Therefore, curvature of field and astigmatism can be corrected satisfactorily. On the other hand, when the value of conditional expression (6) exceeds the lower limit, the refractive power of the third lens does not become too strong, and the entire length of the imaging lens can be shortened. More preferably, the range of the following formula is good.
1.7 <f3 × tan ω / Y <7.0 (6) ′

The imaging lens of Claim 4 satisfies the following conditional expressions in the invention of any one of Claims 1-3.
0.38 <r1 × tan ω / Y <0.55 (7)
However,
r1: curvature radius (mm) of the side surface of the first lens object
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens

Conditional expression (7) is a conditional expression for appropriately setting the radius of curvature of the side surface of the first lens object to appropriately shorten the entire imaging lens and correct aberrations. When the value of conditional expression (7) is lower than the upper limit, the refractive power of the first lens object side surface can be appropriately maintained, and the composite principal point of the first lens and the second lens is arranged closer to the object side. The overall length of the imaging lens can be shortened. On the other hand, when the value of conditional expression (7) exceeds the lower limit, the refractive power on the side surface of the first lens object does not increase more than necessary, and high-order spherical aberration and coma aberration generated in the first lens are reduced. Can be suppressed. More preferably, the range of the following formula is good.
0.38 <r1 × tan ω / Y <0.50 (7) ′

The imaging lens of Claim 5 satisfies the following conditional expressions in the invention in any one of Claims 1-4, It is characterized by the above-mentioned.
0.6 <r4 × tan ω / Y <1.8 (8)
However,
r4: radius of curvature of the side surface of the second lens image (mm)
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens

Conditional expression (8) is a condition for appropriately setting the radius of curvature of the second lens image side surface. By making the image side surface of the second lens a strong divergence surface that satisfies the conditional expression (8), the axial chromatic aberration generated in the first lens having a positive refractive power is favorably corrected by the second lens. be able to. Specifically, when the value of the upper limit formula (8) exceeds the lower limit, the radius of curvature does not become too small and the workability is not impaired. On the other hand, when the value of the upper limit formula (8) is less than the upper limit, the chromatic aberration can be corrected well while keeping the Petzval sum small. More preferably, the range of the following formula is good.
0.65 <r4 × tan ω / Y <0.98 (8) ′

The imaging lens of Claim 6 satisfies the following conditional expressions in the invention in any one of Claims 1-5, It is characterized by the above-mentioned.
0.02 <THIL2 × tan ω / Y <0.07 (9)
However,
THIL2: thickness on the optical axis of the second lens (mm)
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens

Conditional expression (9) is a conditional expression for appropriately setting the thickness of the second lens on the optical axis. When the value of conditional expression (9) exceeds the lower limit, the thickness of the second lens does not become too thin, and the moldability is not impaired. On the other hand, when the value of conditional expression (9) is less than the upper limit, the thickness of the second lens does not become too thick, and it is easy to secure the lens interval before and after L2, and as a result, the overall length of the imaging lens can be shortened. it can. More preferably, the range of the following formula is good.
0.028 <THIL2 × tan ω / Y <0.041 (9) ′

The imaging lens of Claim 7 satisfies the following conditional expressions in the invention in any one of Claims 1-6, It is characterized by the above-mentioned.
0.055 <THIL6 × tan ω / Y <0.145 (10)
However,
THIL6: thickness of the sixth lens on the optical axis (mm)
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens

Conditional expression (10) is a conditional expression for appropriately setting the thickness of the sixth lens on the optical axis. When the value of conditional expression (10) exceeds the lower limit, the thickness of the sixth lens does not become too thin, and the moldability is not impaired. On the other hand, when the value of conditional expression (10) is less than the upper limit, the thickness of the sixth lens does not become too thick, and it becomes easy to ensure the back focus. More preferably, the range of the following formula is good.
0.055 <THIL6 × tan ω / Y <0.095 (10) ′

An imaging lens according to an eighth aspect of the invention according to any one of the first to seventh aspects satisfies the following conditional expression.
10 <| ν3-ν4 | <55 (11)
However,
ν3: Abbe number of the third lens ν4: Abbe number of the fourth lens

Conditional expression (11) is a conditional expression for satisfactorily correcting chromatic aberration of the entire imaging lens system. By exceeding the lower limit of the conditional expression (11), chromatic aberrations such as longitudinal chromatic aberration and lateral chromatic aberration can be corrected in a well-balanced manner. On the other hand, it can comprise with the easily available glass material by being less than an upper limit. More preferably, the range of the following formula is good.
20 <| ν3-ν4 | <45 (11) ′

An imaging lens according to a ninth aspect is characterized in that, in the invention according to any one of the first to eighth aspects, the following conditional expression is satisfied.
20 <ν1-ν2 <55 (12)
However,
ν1: Abbe number of the first lens ν2: Abbe number of the second lens

Conditional expression (12) is a conditional expression for satisfactorily correcting chromatic aberration of the entire imaging lens system. When the value of conditional expression (12) exceeds the lower limit, chromatic aberrations such as axial chromatic aberration and lateral chromatic aberration can be corrected in a well-balanced manner. On the other hand, when the value of conditional expression (12) is less than the upper limit, it can be made of an easily available glass material. More preferably, the range of the following formula is good.
20 <ν1-ν2 <45 (12) ′

  An imaging lens according to a tenth aspect is the invention according to any one of the first to ninth aspects, wherein the object side surface of the sixth lens has an aspherical shape, and an extreme value is provided at a position other than the intersection with the optical axis. It is characterized by having.

  By making the object side surface of the sixth lens an aspheric shape and having an extreme value at a position other than the intersection with the optical axis, the distortion at the periphery of the screen can be corrected better, and the telecentric characteristics can be further improved. Will be able to.

It should be noted that even when a lens having substantially no power in the paraxial region is provided in the configuration of claim 1, it is within the scope of the present invention. By providing such a lens, it is possible to further improve the image plane property of the peripheral area of the pupil or to provide the function of an IR cut filter.

An imaging device according to an eleventh aspect includes the imaging lens according to any one of the first to tenth aspects. .

A portable terminal according to a twelfth aspect includes the imaging device according to the eleventh aspect.

  According to the present invention, a six-lens imaging lens having a brightness of F2.4 or less, in which various aberrations are favorably corrected while being smaller than the conventional type, an imaging device using the same, and a portable terminal are provided. Can be provided.

It is a perspective view of the imaging unit 50 concerning this Embodiment. 3 is a diagram schematically showing a cross section along the optical axis of an imaging optical system of the imaging unit 50. FIG. It is the front view (a) of the smart phone as a portable terminal to which an imaging unit is applied, and the back view (b) of the smart phone to which the imaging unit is applied. It is a control block diagram of the smart phone of FIG. 3 is a cross-sectional view in the optical axis direction of the imaging lens of Example 1. FIG. FIG. 4 is an aberration diagram of Example 1 (spherical aberration (a), astigmatism (b), distortion (c)). FIG. 6 is a cross-sectional view in the optical axis direction of the imaging lens of Example 2. FIG. 6 is an aberration diagram of Example 2 (spherical aberration (a), astigmatism (b), distortion (c)). 6 is a cross-sectional view in the optical axis direction of the imaging lens of Embodiment 3. FIG. FIG. 6 is an aberration diagram of Example 3 (spherical aberration (a), astigmatism (b), distortion (c)). 6 is a cross-sectional view in the optical axis direction of an imaging lens of Example 4. FIG. FIG. 6 is an aberration diagram of Example 4 (spherical aberration (a), astigmatism (b), distortion (c)). 6 is a cross-sectional view in the optical axis direction of the imaging lens of Example 5. FIG. FIG. 6 is an aberration diagram of Example 5 (spherical aberration (a), astigmatism (b), distortion (c)). 7 is a cross-sectional view in the optical axis direction of an imaging lens of Example 6. FIG. FIG. 10 is an aberration diagram of Example 6 (spherical aberration (a), astigmatism (b), distortion (c)). 10 is a cross-sectional view in the optical axis direction of an imaging lens of Example 7. FIG. FIG. 10 is an aberration diagram of Example 7 (spherical aberration (a), astigmatism (b), distortion (c)). FIG. 10 is a cross-sectional view in the optical axis direction of the imaging lens of Example 8. FIG. 10 is an aberration diagram of Example 8 (spherical aberration (a), astigmatism (b), distortion (c)). 10 is a cross-sectional view in the optical axis direction of an imaging lens of Example 9. FIG. FIG. 10 is an aberration diagram of Example 9 (spherical aberration (a), astigmatism (b), distortion (c)). FIG. 12 is a cross-sectional view in the optical axis direction of the imaging lens of Example 10. FIG. 10 is an aberration diagram of Example 10 (spherical aberration (a), astigmatism (b), distortion (c)).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an imaging unit (imaging device) 50 according to the present embodiment, and FIG. 2 is a diagram schematically showing a cross section along the optical axis of the imaging lens of the imaging unit 50.

  As shown in FIGS. 1 and 2, the imaging unit 50 includes a CMOS type imaging device 51 as a solid-state imaging device having a photoelectric conversion unit 51 a and an imaging lens 10 that causes the photoelectric conversion unit 51 a of the imaging device 51 to image a subject image. And a lens barrel 53 that holds the imaging lens 10, a parallel plate-like optical filter 54 disposed between the imaging lens 10 and the imaging element 51, an actuator 55 that drives the imaging lens 10, and the imaging element 51. And the base member 57 that holds the imaging lens 10 and the actuator 55.

  As shown in FIG. 2, the imaging element 51 has a photoelectric conversion part 51 a as a light receiving part in which pixels (photoelectric conversion elements) are two-dimensionally arranged at the center of the plane on the light receiving side. A signal processing circuit (not shown) is formed around the periphery. Such a signal processing circuit includes a drive circuit unit that sequentially drives each pixel to obtain a signal charge, an A / D conversion unit that converts each signal charge into a digital signal, and a signal that forms an image signal output using the digital signal. It consists of a processing unit and the like. In addition, a large number of pads (not shown) are arranged in the vicinity of the outer edge of the plane on the light receiving side of the image sensor 51, and are connected to the substrate 52 via wires 51b. The image sensor 51 converts the signal charge from the photoelectric conversion unit 51a into an image signal such as a digital YUV signal and outputs the image signal to a predetermined circuit on the substrate 52 through the wire 51b. Here, Y is a luminance signal, U (= R−Y) is a color difference signal between red and the luminance signal, and V (= BY) is a color difference signal between blue and the luminance signal. Note that the image sensor is not limited to the above CMOS image sensor, and other devices such as a CCD may be used.

  The pedestal member 57 integrally formed of resin has a generally rectangular parallelepiped housing shape, and includes four side wall portions 57a provided so as to surround the image sensor 51 and an upper wall portion 57b intersecting with the upper end thereof. Have. A rectangular opening 57c is formed at the center of the upper wall portion 57b, and the optical filter 54 is attached to the upper wall portion 57b so as to cover the opening 57c. The substrate 52 supports the imaging element 51 and the pedestal member 57 on its upper surface.

  The actuator 55 includes a cylindrical carrier 55a screwed into the lens barrel 53, a coil 55b attached to the carrier 55a and extending in the optical axis direction, a magnet 55c arranged to oppose the coil 55b, and a magnet 55c. It consists of a supported housing-like yoke 55d. The coil 55b is connected to an external circuit via a wiring (not shown). The lower end of the yoke 55d is bonded onto the upper wall portion 57b of the base member 57. The carrier 55a is urged toward the image sensor 51 by an elastic member (not shown).

  A flange portion 53 a provided with a small opening (here, an aperture stop) S is formed on the object side of the lens barrel 53. The aperture stop may be provided between the first lens L1 and the second lens L2. Here, in addition to the aperture stop, a light-shielding stop SH for ghost cut due to off-axis rays and multiple reflection between lenses is disposed between the lenses. Although the light-shielding diaphragm is disposed between the lenses, the light-shielding ratio can be increased as the light-shielding diaphragm is disposed on the object side or between the plurality of lenses.

The imaging lens 10 disposed in the lens barrel 53 has, in order from the object side, a first lens L1 having a positive refractive power, a convex surface facing the object side in the vicinity of the optical axis, and both surfaces being aspherical, negative Second lens L2, third lens L3, fourth lens L4, and fifth lens L5 having a refractive power and having a concave surface facing the image side in the vicinity of the optical axis, and having a negative refractive power on the image side in the vicinity of the optical axis The sixth lens L6 has a concave surface, and the aperture stop S is disposed on the object side or the image side of the first lens L1. The image side surface of the sixth lens L6 has an aspherical shape, and is an intersection with the optical axis. It has extreme values at other positions and satisfies the following conditional expression.
0.66 ≦ DEV2S1 / EDiaS1 ≦ 0.97 (1)
0.48 <DEV1S2 / EDiaS2 <0.97 (2)
0.60 <f1 × tan ω / Y <0.95 (3)
−0.60 <f6 × tan ω / Y ≦ −0.43 (4)
However,
DEV2S1: Distance (mm) from the optical axis at the position where the value of the second derivative of the first lens object side surface sag amount becomes the maximum value within the effective diameter
EDiaS1: Effective radius DEV1S2 of the object side surface of the first lens L1: Distance from the optical axis at the position where the value of the first derivative of the sag amount on the first lens image side surface is the maximum within the effective diameter (mm)
EdiaS2: Effective radius f1 of the first lens L1 image side surface f1: Focal length ω of the first lens L1: Maximum angle of view (°) of the imaging lens
Y: Maximum image height of the imaging lens (mm)
f6: focal length of the sixth lens L6

  Spacers SP are disposed between the flanges of the respective lenses and between the sixth lens L6 and the IR cut filter F, so that the distance between the optical axes is properly maintained.

  The operation of the imaging unit 50 described above will be described. FIG. 3 is a diagram illustrating a state in which the imaging unit 50 is mounted on the smartphone 100 as a mobile terminal. FIG. 4 is a control block diagram of the smartphone 100.

  In the imaging unit 50, for example, the object-side end surface of the housing 53 is provided on the back surface of the smartphone 100 (see FIG. 3B), and is disposed at a position corresponding to the back side of the touch panel 70.

  The imaging unit 50 is connected to the control unit 101 of the smartphone 100 and outputs an image signal such as a luminance signal or a color difference signal to the control unit 101 side.

  On the other hand, as shown in FIG. 4, the smartphone 100 performs overall control of each unit, and also inputs a control unit (CPU) 101 that executes a program corresponding to each process, and inputs a number and the like with a key. Unit 60, a liquid crystal display unit 70 for displaying captured images in addition to predetermined data, a wireless communication unit 80 for realizing various information communication with an external server, a system program for mobile phone 100, Obtained by a storage unit (ROM) 91 storing various processing programs and necessary data such as a terminal ID, and various processing programs and data executed by the control unit 101, or processing data, or the imaging unit 50 And a temporary storage unit (RAM) 92 that is used as a work area for temporarily storing imaging data and the like.

  The smartphone 100 operates by operating the input key unit 60, and touches an icon 71 or the like displayed on the touch panel (display unit) 70, whereby the imaging unit 50 can be operated to perform imaging. At this time, by driving the actuator 55, the lens barrel 53 can be moved together with the imaging lens 10 in the optical axis direction to perform focusing. The image signal input from the imaging unit 50 is subjected to image processing to be described later in the control unit 101, stored in the storage unit 92 or displayed on the touch panel 70 by the control system of the smartphone 100, and wirelessly It is transmitted to the outside as video information via the communication unit 80.

[Example]
Examples of the imaging lens of the present invention will be shown below. Symbols used in each example are as follows.
f: Focal length of the entire imaging lens fB: Back focus F: F number 2Y: Diagonal length of imaging surface of solid-state imaging device
ENTP: Entrance pupil position (distance from first surface to entrance pupil position)
EXTP: Exit pupil position (distance from imaging surface to exit pupil position)
H1: Front principal point position (distance from the first surface to the front principal point position)
H2: Rear principal point position (distance from the final surface to the rear principal point position)
R: radius of curvature D: axial distance Nd: refractive index of lens material with respect to d-line νd: Abbe number of lens material with respect to d-line

  In each embodiment, the surface described with “*” after each surface number is a surface having an aspheric shape, and the shape of the aspheric surface has the vertex of the surface as the origin and the X axis in the optical axis direction. (The image side is plus), and the height in the direction perpendicular to the optical axis is h, and is expressed by the following “Expression 1”.

ただし、
Ａｉ：ｉ次の非球面係数
Ｒ ：曲率半径
Ｋ ：円錐定数

However,
Ai: i-order aspheric coefficient R: radius of curvature K: conic constant

  Regarding the meaning of the paraxial radius of curvature described in the claims and the examples, in the actual lens measurement scene, in the vicinity of the center of the lens (specifically, the central region within 10% of the lens outer diameter) ) Can be regarded as the paraxial curvature radius when fitting the shape measurement value in the least square method. For example, when a secondary aspherical coefficient is used, a radius of curvature that takes into account the secondary aspherical coefficient in the reference curvature radius of the aspherical definition formula can be regarded as the paraxial curvature radius. (For example, refer to P41-42 of “Lens Design Method” written by Yoshiya Matsui (Kyoritsu Publishing Co., Ltd.) as a reference)

Example 1
Table 1 shows lens data of Example 1. In the following (including the lens data in the table), a power of 10 (for example, 2.5 × 10 ⁻⁰² ) is expressed using E (for example, 2.5E-02).

[Table 1]
Example 1

f = 3.68mm fB = 0.3mm F = 1.86 2Y = 6.142mm
ENTP = 0mm EXTP = -2.26mm H1 = -1.62mm H2 = -3.38mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.329 0.99
2 * 1.574 0.547 1.54470 56.2 1.05
3 * 22.259 0.084 1.05
4 * 9.865 0.150 1.63470 23.9 1.04
5 * 2.638 0.402 0.99
6 * 8.320 0.429 1.54470 56.2 1.04
7 * 115.518 0.212 1.16
8 * 58.683 0.261 1.63470 23.9 1.19
9 * 9.787 0.268 1.37
10 * -62.209 0.734 1.54470 56.2 1.45
11 * -1.091 0.376 1.70
12 * -3.646 0.234 1.54470 56.2 2.37
13 * 1.273 0.493 2.59
14 ∞ 0.110 1.51630 64.1 2.87
15 ∞ 2.90

Aspheric coefficient

2nd side 8th side
K = 0.10282E + 00 K = 0.00000E + 00
A4 = 0.50077E-02 A4 = -0.14308E + 00
A6 = -0.16639E-04 A6 = -0.24846E-01
A8 = -0.75861E-02 A8 = -0.53479E-02
A10 = 0.14284E-01 A10 = 0.48472E-02
A12 = 0.80568E-02 A12 = -0.72624E-03
A14 = -0.17859E-01 A14 = 0.00000E + 00

3rd side 9th side
K = 0.78869E + 02 K = -0.80000E + 02
A3 = 0.00000E + 00 A3 = 0.16404E-01
A4 = 0.10225E-01 A4 = -0.15977E + 00
A5 = 0.00000E + 00 A5 = 0.18467E-01
A6 = 0.14362E-01 A6 = 0.35902E-02
A8 = 0.12681E-01 A8 = -0.70663E-02
A10 = -0.28880E-01 A10 = 0.29704E-02
A12 = -0.23698E-01 A12 = -0.29238E-02
A14 = 0.16254E-01 A14 = 0.25366E-02

4th page 10th page
K = -0.80000E + 02 K = 0.80000E + 02
A3 = 0.00000E + 00 A3 = -0.51645E-01
A4 = -0.30197E-01 A4 = 0.53889E-01
A5 = 0.00000E + 00 A5 = -0.11885E + 00
A6 = 0.12161E + 00 A6 = 0.92526E-02
A8 = -0.51946E-01 A8 = 0.29919E-01
A10 = -0.50088E-01 A10 = -0.13066E-01
A12 = 0.55608E-02 A12 = -0.58796E-02
A14 = 0.27505E-01 A14 = 0.34011E-02

5th surface 11th surface
K = -0.16938E + 02 K = -0.63594E + 01
A3 = 0.00000E + 00 A3 = -0.11351E + 00
A4 = 0.69576E-01 A4 = -0.32515E-01
A5 = 0.00000E + 00 A5 = 0.18679E-01
A6 = 0.52759E-01 A6 = 0.18346E-01
A8 = -0.53316E-02 A8 = -0.99971E-02
A10 = -0.13632E-01 A10 = 0.19888E-02
A12 = -0.22016E-01 A12 = 0.10348E-02
A14 = 0.53342E-01 A14 = -0.32439E-03

6th page 12th page
K = 0.56320E + 02 K = -0.19161E + 01
A3 = -0.15394E-01 A3 = -0.85741E-01
A4 = -0.25711E-01 A4 = 0.69095E-02
A5 = -0.79268E-01 A5 = 0.76892E-02
A6 = 0.14590E-01 A6 = 0.61694E-02
A8 = 0.25814E-02 A8 = -0.19138E-03
A10 = -0.14865E-01 A10 = -0.11753E-03
A12 = -0.64426E-02 A12 = 0.59722E-05
A14 = -0.19014E-02 A14 = 0.38901E-06

7th 13th
K = 0.00000E + 00 K = -0.87609E + 01
A3 = 0.00000E + 00 A3 = -0.93249E-01
A4 = -0.70691E-01 A4 = 0.24764E-01
A5 = 0.00000E + 00 A5 = -0.39222E-04
A6 = -0.50026E-01 A6 = -0.13579E-02
A8 = -0.23068E-02 A8 = -0.27480E-03
A10 = 0.13138E-01 A10 = 0.71990E-04
A12 = -0.15968E-01 A12 = -0.75005E-05
A14 = 0.00000E + 00 A14 = 0.55560E-06

Single lens data

Lens Start surface Focal length (mm)
1 2 3.080
2 4 -5.718
3 6 16.437
4 8 -18.546
5 10 2.030
6 12 -1.703

  5 is a cross-sectional view of the imaging lens of Example 1. FIG. In the drawing, an imaging lens is a first lens L1 having a positive refractive power, a convex surface facing the object side in the vicinity of the optical axis, and both surfaces being aspherical in order from the object side. A second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 having a concave surface facing the image side near the axis, and a sixth lens having a negative refractive power and facing the image side near the optical axis Lens L6. The aperture stop S is disposed on the object side of the first lens L1, the image side surface of the sixth lens L6 is aspheric, and has an extreme value at a position other than the intersection with the optical axis. I indicates an imaging surface. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 6 is an aberration diagram of Example 1 (spherical aberration (a), astigmatism (b), distortion (c)). Here, in the spherical aberration diagram, the solid line represents the spherical aberration amount and the coma aberration amount with respect to the d line, and the dotted line represents the spherical aberration amount and the coma aberration amount, respectively. ,the same). The spherical aberration curve shown in FIG. 6A is bent in the direction from the minus side toward the plus side in the vicinity of the entrance pupil.

(Example 2)
Table 2 shows lens data of the imaging lens of Example 2.

[Table 2]
Example 2

f = 3.68mm fB = 0.34mm F = 1.86 2Y = 6.142mm
ENTP = 0mm EXTP = -2.1mm H1 = -1.87mm H2 = -3.34mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.361 0.99
2 * 1.519 0.570 1.54470 56.2 1.05
3 * 41.936 0.084 1.04
4 * 16.668 0.120 1.63470 23.9 1.02
5 * 2.684 0.443 0.96
6 * 9.011 0.326 1.54470 56.2 1.03
7 * 281.394 0.348 1.13
8 * 17.305 0.150 1.63470 23.9 1.24
9 * 7.857 0.251 1.35
10 * 198.227 0.521 1.54470 56.2 1.45
11 * -1.228 0.418 1.67
12 * -3.065 0.207 1.54470 56.2 2.26
13 * 1.480 0.452 2.49
14 ∞ 0.110 1.51630 64.1 2.87
15 ∞ 2.90

Aspheric coefficient

2nd side 8th side
K = 0.13458E + 00 K = 0.00000E + 00
A4 = 0.62910E-02 A4 = -0.14675E + 00
A6 = -0.17459E-02 A6 = -0.72681E-03
A8 = -0.73483E-02 A8 = -0.88520E-02
A10 = 0.16343E-01 A10 = 0.36010E-02
A12 = 0.10087E-01 A12 = -0.93350E-03
A14 = -0.17610E-01 A14 = 0.00000E + 00

3rd side 9th side
K = -0.70223E + 02 K = -0.79935E + 02
A3 = 0.00000E + 00 A3 = 0.18477E-01
A4 = 0.16111E-01 A4 = -0.18425E + 00
A5 = 0.00000E + 00 A5 = 0.11167E-01
A6 = 0.70309E-02 A6 = 0.82203E-02
A8 = 0.22634E-01 A8 = -0.47147E-02
A10 = -0.25815E-01 A10 = 0.18972E-02
A12 = -0.27058E-01 A12 = -0.33738E-02
A14 = 0.16068E-01 A14 = 0.29802E-02

4th page 10th page
K = 0.79230E + 02 K = -0.65134E + 02
A3 = 0.00000E + 00 A3 = -0.14360E-01
A4 = -0.28581E-01 A4 = 0.30009E-01
A5 = 0.00000E + 00 A5 = -0.13197E + 00
A6 = 0.12542E + 00 A6 = 0.11825E-01
A8 = -0.59868E-01 A8 = 0.32590E-01
A10 = -0.50284E-01 A10 = -0.11994E-01
A12 = 0.45973E-02 A12 = -0.57726E-02
A14 = 0.27386E-01 A14 = 0.29475E-02

5th surface 11th surface
K = -0.16979E + 02 K = -0.96496E + 01
A3 = 0.00000E + 00 A3 = -0.13250E + 00
A4 = 0.85069E-01 A4 = -0.17727E-01
A5 = 0.00000E + 00 A5 = 0.29100E-01
A6 = 0.72788E-01 A6 = 0.16100E-01
A8 = -0.99495E-02 A8 = -0.12032E-01
A10 = -0.24829E-01 A10 = 0.22035E-02
A12 = -0.26857E-01 A12 = 0.10920E-02
A14 = 0.76389E-01 A14 = -0.34305E-03

6th page 12th page
K = 0.70628E + 02 K = -0.44951E + 01
A3 = -0.17391E-01 A3 = -0.10136E + 00
A4 = -0.33610E-01 A4 = 0.97213E-02
A5 = -0.10890E + 00 A5 = 0.85886E-02
A6 = 0.79275E-02 A6 = 0.61274E-02
A8 = 0.36782E-01 A8 = -0.27440E-03
A10 = -0.25640E-01 A10 = -0.13121E-03
A12 = -0.44346E-01 A12 = 0.64386E-05
A14 = 0.20860E-01 A14 = 0.67637E-06

7th 13th
K = 0.00000E + 00 K = -0.12503E + 02
A3 = 0.00000E + 00 A3 = -0.83766E-01
A4 = -0.73593E-01 A4 = 0.18678E-01
A5 = 0.00000E + 00 A5 = -0.64612E-03
A6 = -0.64082E-01 A6 = -0.12122E-02
A8 = 0.60494E-02 A8 = -0.35321E-03
A10 = 0.19396E-01 A10 = 0.47555E-04
A12 = -0.24120E-01 A12 = -0.94312E-05
A14 = 0.00000E + 00 A14 = 0.13698E-05

Single lens data

Lens Start surface Focal length (mm)
1 2 2.879
2 4 -5.058
3 6 17.083
4 8 -22.816
5 10 2.243
6 12 -1.804

  FIG. 7 is a sectional view of the lens of Example 2. In the drawing, an imaging lens is a first lens L1 having a positive refractive power, a convex surface facing the object side in the vicinity of the optical axis, and both surfaces being aspherical in order from the object side. A second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 having a concave surface facing the image side near the axis, and a sixth lens having a negative refractive power and facing the image side near the optical axis Lens L6. The aperture stop S is disposed on the object side of the first lens L1, the image side surface of the sixth lens L6 is aspheric, and has an extreme value at a position other than the intersection with the optical axis. I indicates an imaging surface. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 8 is an aberration diagram of Example 2 (spherical aberration (a), astigmatism (b), distortion (c)). The spherical aberration curve shown in FIG. 8A is bent in the direction from the minus side to the plus side in the vicinity of the entrance pupil.

(Example 3)
Table 3 shows lens data of the imaging lens of Example 3.

[Table 3]
Example 3

f = 3.68mm fB = 0.32mm F = 1.86 2Y = 6.142mm
ENTP = 0.47mm EXTP = -2.08mm H1 = -1.49mm H2 = -3.36mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 ∞ 0.000 1.40
2 ∞ 0.000 1.40
3 * 1.546 0.619 1.54470 56.2 1.08
4 (Aperture) 38.590 0.084 0.93
5 * 60.690 0.120 1.63470 23.9 0.94
6 * 3.238 0.376 0.92
7 * 7.964 0.321 1.54470 56.2 0.99
8 * 39.726 0.245 1.09
9 * 14.013 0.274 1.63470 23.9 1.16
10 * 7.304 0.338 1.36
11 * -398.762 0.583 1.54470 56.2 1.49
12 * -1.093 0.336 1.68
13 * -3.532 0.210 1.54470 56.2 2.34
14 * 1.205 0.485 2.52
15 ∞ 0.110 1.51630 64.1 2.87
16 ∞ 2.91

Aspheric coefficient

3rd side 9th side
K = 0.18852E-01 K = 0.00000E + 00
A4 = 0.22326E-02 A4 = -0.16552E + 00
A6 = 0.16783E-02 A6 = 0.31360E-01
A8 = -0.19781E-01 A8 = -0.19473E-01
A10 = 0.58555E-02 A10 = -0.93824E-02
A12 = 0.11470E-01 A12 = -0.27285E-02
A14 = -0.18146E-01 A14 = 0.00000E + 00

4th page 10th page
K = 0.29186E + 01 K = -0.80000E + 02
A3 = 0.00000E + 00 A3 = 0.11477E-01
A4 = -0.73300E-02 A4 = -0.17490E + 00
A5 = 0.00000E + 00 A5 = 0.30811E-01
A6 = -0.90843E-02 A6 = 0.13361E-01
A8 = 0.17414E-01 A8 = -0.91540E-02
A10 = -0.15740E-01 A10 = 0.23339E-03
A12 = -0.18982E-01 A12 = -0.34299E-02
A14 = 0.10682E-01 A14 = 0.29946E-02

5th surface 11th surface
K = 0.79417E + 02 K = -0.80000E + 02
A3 = 0.00000E + 00 A3 = -0.12984E-01
A4 = -0.24623E-01 A4 = 0.33037E-01
A5 = 0.00000E + 00 A5 = -0.12790E + 00
A6 = 0.12497E + 00 A6 = 0.11674E-01
A8 = -0.51005E-01 A8 = 0.28497E-01
A10 = -0.13812E-01 A10 = -0.12669E-01
A12 = 0.10801E-01 A12 = -0.53121E-02
A14 = 0.14382E-01 A14 = 0.30616E-02

6th page 12th page
K = -0.18959E + 02 K = -0.77695E + 01
A3 = 0.00000E + 00 A3 = -0.98404E-01
A4 = 0.67447E-01 A4 = -0.32476E-01
A5 = 0.00000E + 00 A5 = 0.28251E-01
A6 = 0.69216E-01 A6 = 0.11082E-01
A8 = 0.22643E-01 A8 = -0.13169E-01
A10 = -0.13124E-01 A10 = 0.22979E-02
A12 = -0.50987E-01 A12 = 0.12251E-02
A14 = 0.78786E-01 A14 = -0.33539E-03

7th 13th
K = 0.60180E + 02 K = -0.20965E + 01
A3 = -0.12750E-01 A3 = -0.93907E-01
A4 = -0.21695E-01 A4 = 0.76395E-02
A5 = -0.12511E + 00 A5 = 0.82751E-02
A6 = 0.81387E-02 A6 = 0.63567E-02
A8 = 0.39715E-01 A8 = -0.18912E-03
A10 = -0.34249E-01 A10 = -0.11858E-03
A12 = -0.51048E-01 A12 = 0.66095E-05
A14 = 0.14490E-01 A14 = 0.32040E-06

8th 14th
K = 0.00000E + 00 K = -0.99912E + 01
A3 = 0.00000E + 00 A3 = -0.96174E-01
A4 = -0.71720E-01 A4 = 0.28918E-01
A5 = 0.00000E + 00 A5 = -0.11561E-02
A6 = -0.55914E-01 A6 = -0.21909E-02
A8 = -0.52700E-02 A8 = -0.32720E-03
A10 = 0.14505E-01 A10 = 0.68600E-04
A12 = -0.29739E-01 A12 = -0.70993E-05
A14 = 0.00000E + 00 A14 = 0.10156E-05

Single lens data

Lens Start surface Focal length (mm)
1 3 2.940
2 5 -5.393
3 7 18.223
4 9 -24.422
5 11 2.012
6 13 -1.624

  FIG. 9 is a sectional view of the lens of Example 3. In the drawing, an imaging lens is a first lens L1 having a positive refractive power, a convex surface facing the object side in the vicinity of the optical axis, and both surfaces being aspherical in order from the object side. A second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 having a concave surface facing the image side near the axis, and a sixth lens having a negative refractive power and facing the image side near the optical axis Lens L6. An aperture stop S is disposed on the image side of the first lens L1 (between the lenses L1 and L2), the image side surface of the sixth lens L6 is aspherical, and has an extreme value at a position other than the intersection with the optical axis. . I indicates an imaging surface. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 10 is an aberration diagram of Example 3 (spherical aberration (a), astigmatism (b), distortion (c)). The spherical aberration curve shown in FIG. 10A is bent in the direction from the minus side to the plus side in the vicinity of the entrance pupil.

Example 4
Table 4 shows lens data of the imaging lens of Example 4.

[Table 4]
Example 4

f = 3.68mm fB = 0.32mm F = 1.86 2Y = 6.142mm
ENTP = 0mm EXTP = -2.17mm H1 = -1.75mm H2 = -3.36mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.345 0.99
2 * 1.551 0.557 1.54470 56.2 1.06
3 * 26.414 0.084 1.05
4 * 16.422 0.120 1.63470 23.9 1.04
5 * 2.781 0.427 0.98
6 * 8.924 0.433 1.54470 56.2 1.04
7 * -47.686 0.316 1.17
8 * 21.451 0.164 1.63470 23.9 1.25
9 * 7.474 0.248 1.37
10 * 203.540 0.605 1.54470 56.2 1.47
11 * -1.160 0.396 1.68
12 * -3.397 0.213 1.54470 56.2 2.34
13 * 1.338 0.477 2.55
14 ∞ 0.110 1.51630 64.1 2.87
15 ∞ 2.90

Aspheric coefficient

2nd side 8th side
K = 0.13733E + 00 K = 0.00000E + 00
A4 = 0.61388E-02 A4 = -0.15180E + 00
A6 = -0.67735E-03 A6 = -0.84027E-02
A8 = -0.78506E-02 A8 = -0.84774E-02
A10 = 0.15379E-01 A10 = 0.38115E-02
A12 = 0.93740E-02 A12 = 0.73116E-03
A14 = -0.17917E-01 A14 = 0.00000E + 00

3rd side 9th side
K = 0.31538E + 02 K = -0.79980E + 02
A3 = 0.00000E + 00 A3 = 0.17293E-01
A4 = 0.14588E-01 A4 = -0.17965E + 00
A5 = 0.00000E + 00 A5 = 0.11478E-01
A6 = 0.87405E-02 A6 = 0.58607E-02
A8 = 0.19631E-01 A8 = -0.45592E-02
A10 = -0.29532E-01 A10 = 0.28297E-02
A12 = -0.23970E-01 A12 = -0.31881E-02
A14 = 0.16068E-01 A14 = 0.25841E-02

4th page 10th page
K = 0.67245E + 02 K = -0.80000E + 02
A3 = 0.00000E + 00 A3 = -0.24411E-01
A4 = -0.31072E-01 A4 = 0.30927E-01
A5 = 0.00000E + 00 A5 = -0.13250E + 00
A6 = 0.12501E + 00 A6 = 0.15136E-01
A8 = -0.55849E-01 A8 = 0.32453E-01
A10 = -0.49096E-01 A10 = -0.12261E-01
A12 = 0.52772E-02 A12 = -0.57953E-02
A14 = 0.27386E-01 A14 = 0.30428E-02

5th surface 11th surface
K = -0.17965E + 02 K = -0.80983E + 01
A3 = 0.00000E + 00 A3 = -0.12790E + 00
A4 = 0.75665E-01 A4 = -0.23244E-01
A5 = 0.00000E + 00 A5 = 0.22729E-01
A6 = 0.64030E-01 A6 = 0.15416E-01
A8 = -0.48273E-02 A8 = -0.10671E-01
A10 = -0.19757E-01 A10 = 0.23028E-02
A12 = -0.24612E-01 A12 = 0.10996E-02
A14 = 0.63554E-01 A14 = -0.35605E-03

6th page 12th page
K = 0.67713E + 02 K = -0.32380E + 01
A3 = -0.20267E-01 A3 = -0.98964E-01
A4 = -0.17598E-01 A4 = 0.94302E-02
A5 = -0.10062E + 00 A5 = 0.87681E-02
A6 = 0.37135E-02 A6 = 0.63041E-02
A8 = 0.26210E-01 A8 = -0.22987E-03
A10 = -0.17855E-01 A10 = -0.12474E-03
A12 = -0.29299E-01 A12 = 0.65452E-05
A14 = 0.84087E-02 A14 = 0.43353E-06

7th 13th
K = 0.00000E + 00 K = -0.10460E + 02
A3 = 0.00000E + 00 A3 = -0.84233E-01
A4 = -0.62531E-01 A4 = 0.19913E-01
A5 = 0.00000E + 00 A5 = -0.53237E-03
A6 = -0.58541E-01 A6 = -0.93664E-03
A8 = 0.11324E-02 A8 = -0.26170E-03
A10 = 0.18236E-01 A10 = 0.64668E-04
A12 = -0.17904E-01 A12 = -0.95128E-05
A14 = 0.00000E + 00 A14 = 0.96407E-06

Single lens data

Lens Start surface Focal length (mm)
1 2 3.001
2 4 -5.293
3 6 13.838
4 8 -18.157
5 10 2.120
6 12 -1.734

  FIG. 11 is a sectional view of the lens of Example 4. In the drawing, an imaging lens is a first lens L1 having a positive refractive power, a convex surface facing the object side in the vicinity of the optical axis, and both surfaces being aspherical in order from the object side. A second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 having a concave surface facing the image side near the axis, and a sixth lens having a negative refractive power and facing the image side near the optical axis Lens L6. The aperture stop S is disposed on the object side of the first lens L1, the image side surface of the sixth lens L6 is aspheric, and has an extreme value at a position other than the intersection with the optical axis. I indicates an imaging surface. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 12 is an aberration diagram of Example 4 (spherical aberration (a), astigmatism (b), distortion (c)). The spherical aberration curve shown in FIG. 12A is bent in the direction from the minus side to the plus side in the vicinity of the entrance pupil.

(Example 5)
Table 5 shows lens data of the imaging lens of Example 5.

[Table 5]
Example 5

f = 3.47mm fB = 0.28mm F = 1.86 2Y = 6.142mm
ENTP = 0mm EXTP = -2.16mm H1 = -1.46mm H2 = -3.19mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.313 0.93
2 * 1.501 0.521 1.54470 56.2 0.99
3 * 36.341 0.091 0.99
4 * 20.846 0.120 1.63470 23.9 0.98
5 * 2.735 0.388 0.94
6 * 9.199 0.379 1.54470 56.2 1.00
7 * -25.757 0.364 1.11
8 * 9.235 0.150 1.63470 23.9 1.22
9 * 6.434 0.321 1.31
10 * -98.133 0.470 1.54470 56.2 1.38
11 * -1.099 0.304 1.63
12 * -4.552 0.208 1.54470 56.2 2.10
13 * 1.143 0.493 2.41
14 ∞ 0.110 1.51630 64.1 2.85
15 ∞ 2.88

Aspheric coefficient

2nd side 8th side
K = 0.95425E-01 K = 0.00000E + 00
A4 = 0.70806E-02 A4 = -0.14859E + 00
A6 = 0.10473E-02 A6 = -0.22959E-03
A8 = -0.39781E-02 A8 = -0.52870E-02
A10 = 0.13342E-01 A10 = 0.19865E-02
A12 = 0.86437E-02 A12 = -0.82996E-03
A14 = -0.17917E-01 A14 = 0.00000E + 00

3rd side 9th side
K = 0.74472E + 02 K = -0.80000E + 02
A3 = 0.00000E + 00 A3 = 0.25924E-01
A4 = 0.17969E-01 A4 = -0.18559E + 00
A5 = 0.00000E + 00 A5 = 0.12763E-01
A6 = -0.27497E-02 A6 = 0.51073E-02
A8 = 0.29712E-01 A8 = -0.52611E-02
A10 = -0.23273E-01 A10 = 0.35008E-02
A12 = -0.32870E-01 A12 = -0.26348E-02
A14 = 0.16068E-01 A14 = 0.27702E-02

4th page 10th page
K = -0.60153E + 02 K = -0.80000E + 02
A3 = 0.00000E + 00 A3 = -0.33695E-01
A4 = -0.35699E-01 A4 = 0.42713E-01
A5 = 0.00000E + 00 A5 = -0.14388E + 00
A6 = 0.14004E + 00 A6 = 0.65995E-02
A8 = -0.65472E-01 A8 = 0.31666E-01
A10 = -0.53805E-01 A10 = -0.12191E-01
A12 = 0.85176E-02 A12 = -0.58282E-02
A14 = 0.27386E-01 A14 = 0.30420E-02

5th surface 11th surface
K = -0.17945E + 02 K = -0.82819E + 01
A3 = 0.00000E + 00 A3 = -0.10949E + 00
A4 = 0.78322E-01 A4 = -0.23177E-01
A5 = 0.00000E + 00 A5 = 0.25660E-01
A6 = 0.74463E-01 A6 = 0.16367E-01
A8 = 0.77343E-02 A8 = -0.10712E-01
A10 = -0.30846E-01 A10 = 0.23074E-02
A12 = -0.29489E-01 A12 = 0.10687E-02
A14 = 0.78131E-01 A14 = -0.38017E-03

6th page 12th page
K = 0.76070E + 02 K = -0.25127E + 01
A3 = -0.20838E-01 A3 = -0.11439E + 00
A4 = -0.19970E-01 A4 = 0.11123E-01
A5 = -0.10715E + 00 A5 = 0.90393E-02
A6 = 0.77937E-02 A6 = 0.63048E-02
A8 = 0.35143E-01 A8 = -0.26292E-03
A10 = -0.27560E-01 A10 = -0.13415E-03
A12 = -0.43418E-01 A12 = 0.50838E-05
A14 = 0.22228E-01 A14 = 0.40729E-06

7th 13th
K = 0.00000E + 00 K = -0.87654E + 01
A3 = 0.00000E + 00 A3 = -0.88181E-01
A4 = -0.67685E-01 A4 = 0.89207E-02
A5 = 0.00000E + 00 A5 = 0.63151E-02
A6 = -0.57852E-01 A6 = -0.36751E-02
A8 = 0.93175E-03 A8 = -0.73234E-04
A10 = 0.17587E-01 A10 = 0.49685E-04
A12 = -0.23033E-01 A12 = -0.12207E-04
A14 = 0.00000E + 00 A14 = 0.88568E-06

Single lens data

Lens Start surface Focal length (mm)
1 2 2.860
2 4 -4.972
3 6 12.492
4 8 -34.135
5 10 2.037
6 12 -1.656

  FIG. 13 is a sectional view of the lens of Example 5. In the drawing, an imaging lens is a first lens L1 having a positive refractive power, a convex surface facing the object side in the vicinity of the optical axis, and both surfaces being aspherical in order from the object side. A second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 having a concave surface facing the image side near the axis, and a sixth lens having a negative refractive power and facing the image side near the optical axis Lens L6. The aperture stop S is disposed on the object side of the first lens L1, the image side surface of the sixth lens L6 is aspheric, and has an extreme value at a position other than the intersection with the optical axis. I indicates an imaging surface. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 14 is an aberration diagram of Example 5 (spherical aberration (a), astigmatism (b), distortion (c)). The spherical aberration curve shown in FIG. 14A is bent in the direction from the minus side to the plus side in the vicinity of the entrance pupil.

(Example 6)
Table 6 shows lens data of the imaging lens of Example 6.

[Table 6]
Example 6

f = 3.45mm fB = 0.27mm F = 1.86 2Y = 6.142mm
ENTP = 0mm EXTP = -2.15mm H1 = -1.45mm H2 = -3.17mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.311 0.93
2 * 1.493 0.517 1.54470 56.2 0.99
3 * 34.150 0.090 0.98
4 * 20.228 0.120 1.63470 23.9 0.97
5 * 2.716 0.385 0.93
6 * 9.156 0.376 1.54470 56.2 0.99
7 * -25.371 0.367 1.11
8 * 8.605 0.150 1.63470 23.9 1.22
9 * 6.319 0.329 1.31
10 * -120.861 0.463 1.54470 56.2 1.38
11 * -1.094 0.293 1.64
12 * -4.786 0.208 1.54470 56.2 2.10
13 * 1.114 0.496 2.41
14 ∞ 0.110 1.51630 64.1 2.86
15 ∞ 2.90

Aspheric coefficient


2nd side 8th side
K = 0.97990E-01 K = 0.00000E + 00
A4 = 0.69458E-02 A4 = -0.14880E + 00
A6 = 0.13766E-02 A6 = -0.50318E-03
A8 = -0.34488E-02 A8 = -0.52164E-02
A10 = 0.13637E-01 A10 = 0.17903E-02
A12 = 0.78760E-02 A12 = -0.11172E-02
A14 = -0.17917E-01 A14 = 0.00000E + 00

3rd side 9th side
K = 0.46262E + 02 K = -0.80000E + 02
A3 = 0.00000E + 00 A3 = 0.26523E-01
A4 = 0.18373E-01 A4 = -0.18651E + 00
A5 = 0.00000E + 00 A5 = 0.13029E-01
A6 = -0.29656E-02 A6 = 0.51455E-02
A8 = 0.29839E-01 A8 = -0.54047E-02
A10 = -0.23936E-01 A10 = 0.34941E-02
A12 = -0.32443E-01 A12 = -0.25695E-02
A14 = 0.16068E-01 A14 = 0.28387E-02

4th page 10th page
K = -0.73084E + 02 K = -0.80000E + 02
A3 = 0.00000E + 00 A3 = -0.38131E-01
A4 = -0.35990E-01 A4 = 0.45430E-01
A5 = 0.00000E + 00 A5 = -0.14441E + 00
A6 = 0.14005E + 00 A6 = 0.54393E-02
A8 = -0.65174E-01 A8 = 0.31548E-01
A10 = -0.52780E-01 A10 = -0.12043E-01
A12 = 0.80866E-02 A12 = -0.57432E-02
A14 = 0.27386E-01 A14 = 0.30521E-02

5th surface 11th surface
K = -0.17931E + 02 K = -0.82022E + 01
A3 = 0.00000E + 00 A3 = -0.10541E + 00
A4 = 0.78862E-01 A4 = -0.23899E-01
A5 = 0.00000E + 00 A5 = 0.25874E-01
A6 = 0.75843E-01 A6 = 0.16266E-01
A8 = 0.93697E-02 A8 = -0.10680E-01
A10 = -0.29904E-01 A10 = 0.22645E-02
A12 = -0.29121E-01 A12 = 0.10673E-02
A14 = 0.79720E-01 A14 = -0.37441E-03

6th page 12th page
K = 0.77227E + 02 K = -0.27220E + 01
A3 = -0.20814E-01 A3 = -0.11954E + 00
A4 = -0.20634E-01 A4 = 0.11518E-01
A5 = -0.10772E + 00 A5 = 0.92409E-02
A6 = 0.81305E-02 A6 = 0.63952E-02
A8 = 0.35253E-01 A8 = -0.25230E-03
A10 = -0.28552E-01 A10 = -0.13368E-03
A12 = -0.44540E-01 A12 = 0.48361E-05
A14 = 0.23259E-01 A14 = 0.29805E-06

7th 13th
K = 0.00000E + 00 K = -0.86948E + 01
A3 = 0.00000E + 00 A3 = -0.86540E-01
A4 = -0.68513E-01 A4 = 0.61201E-02
A5 = 0.00000E + 00 A5 = 0.69585E-02
A6 = -0.58250E-01 A6 = -0.35572E-02
A8 = 0.73724E-03 A8 = -0.76633E-04
A10 = 0.17559E-01 A10 = 0.48484E-04
A12 = -0.23734E-01 A12 = -0.12550E-04
A14 = 0.00000E + 00 A14 = 0.86667E-06

Single lens data

Lens Start surface Focal length (mm)
1 2 2.851
2 4 -4.957
3 6 12.399
4 8 -38.458
5 10 2.024
6 12 -1.638

  FIG. 15 is a sectional view of the lens of Example 6. In the drawing, an imaging lens is a first lens L1 having a positive refractive power, a convex surface facing the object side in the vicinity of the optical axis, and both surfaces being aspherical in order from the object side. A second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 having a concave surface facing the image side near the axis, and a sixth lens having a negative refractive power and facing the image side near the optical axis Lens L6. The aperture stop S is disposed on the object side of the first lens L1, the image side surface of the sixth lens L6 is aspheric, and has an extreme value at a position other than the intersection with the optical axis. I indicates an imaging surface. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 16 is an aberration diagram of Example 6 (spherical aberration (a), astigmatism (b), distortion (c)). The spherical aberration curve shown in FIG. 16A is bent in the direction from the minus side to the plus side in the vicinity of the entrance pupil.

(Example 7)
Table 7 shows lens data of the imaging lens of Example 7.

[Table 7]
Example 7

f = 3.47mm fB = 0.29mm F = 1.86 2Y = 6.142mm
ENTP = 0mm EXTP = -2.15mm H1 = -1.46mm H2 = -3.18mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.306 0.93
2 * 1.522 0.517 1.54470 56.2 1.00
3 * 21.243 0.090 1.00
4 * 11.286 0.120 1.63470 23.9 0.99
5 * 2.628 0.407 0.95
6 * 9.185 0.387 1.54470 56.2 1.02
7 * -149.997 0.315 1.14
8 * 15.787 0.142 1.63470 23.9 1.23
9 * 5.336 0.207 1.35
10 * 8.259 0.547 1.54470 56.2 1.46
11 * -1.406 0.494 1.66
12 * -3.050 0.205 1.54470 56.2 2.25
13 * 1.796 0.430 2.49
14 ∞ 0.110 1.51630 64.1 2.86
15 ∞ 2.90

Aspheric coefficient

2nd side 8th side
K = 0.14286E + 00 K = 0.00000E + 00
A4 = 0.64703E-02 A4 = -0.14198E + 00
A6 = -0.31132E-02 A6 = -0.44181E-03
A8 = -0.36242E-02 A8 = -0.10058E-01
A10 = 0.17444E-01 A10 = 0.25865E-02
A12 = 0.88412E-02 A12 = -0.13561E-02
A14 = -0.22560E-01 A14 = 0.00000E + 00

3rd side 9th side
K = 0.77997E + 02 K = -0.79331E + 02
A3 = 0.00000E + 00 A3 = 0.26569E-01
A4 = 0.17928E-01 A4 = -0.18587E + 00
A5 = 0.00000E + 00 A5 = 0.12085E-01
A6 = -0.39110E-02 A6 = 0.93590E-02
A8 = 0.24746E-01 A8 = -0.43152E-02
A10 = -0.23231E-01 A10 = 0.19059E-02
A12 = -0.27480E-01 A12 = -0.34880E-02
A14 = 0.91364E-02 A14 = 0.28555E-02

4th page 10th page
K = 0.56093E + 02 K = 0.18459E + 02
A3 = 0.00000E + 00 A3 = -0.51780E-01
A4 = -0.30996E-01 A4 = 0.35135E-01
A5 = 0.00000E + 00 A5 = -0.13208E + 00
A6 = 0.12609E + 00 A6 = 0.11649E-01
A8 = -0.69374E-01 A8 = 0.33024E-01
A10 = -0.55545E-01 A10 = -0.11816E-01
A12 = 0.58855E-02 A12 = -0.57577E-02
A14 = 0.31866E-01 A14 = 0.29070E-02

5th surface 11th surface
K = -0.14031E + 02 K = -0.11086E + 02
A3 = 0.00000E + 00 A3 = -0.13783E + 00
A4 = 0.83135E-01 A4 = -0.19567E-01
A5 = 0.00000E + 00 A5 = 0.29843E-01
A6 = 0.72842E-01 A6 = 0.16783E-01
A8 = -0.58752E-02 A8 = -0.11906E-01
A10 = -0.26885E-01 A10 = 0.22006E-02
A12 = -0.33395E-01 A12 = 0.10753E-02
A14 = 0.79587E-01 A14 = -0.35625E-03

6th page 12th page
K = 0.75950E + 02 K = -0.41636E + 01
A3 = -0.18572E-01 A3 = -0.10260E + 00
A4 = -0.21489E-01 A4 = 0.95403E-02
A5 = -0.10657E + 00 A5 = 0.85644E-02
A6 = 0.50893E-02 A6 = 0.61349E-02
A8 = 0.37428E-01 A8 = -0.26832E-03
A10 = -0.18955E-01 A10 = -0.12959E-03
A12 = -0.41460E-01 A12 = 0.66800E-05
A14 = 0.17560E-01 A14 = 0.64380E-06

7th 13th
K = 0.00000E + 00 K = -0.11508E + 02
A3 = 0.00000E + 00 A3 = -0.83789E-01
A4 = -0.59041E-01 A4 = 0.18461E-01
A5 = 0.00000E + 00 A5 = -0.65289E-03
A6 = -0.69263E-01 A6 = -0.12049E-02
A8 = 0.40880E-02 A8 = -0.35094E-03
A10 = 0.20695E-01 A10 = 0.47951E-04
A12 = -0.22196E-01 A12 = -0.93767E-05
A14 = 0.00000E + 00 A14 = 0.13762E-05

Single lens data

Lens Start surface Focal length (mm)
1 2 2.982
2 4 -5.427
3 6 15.903
4 8 -12.766
5 10 2.250
6 12 -2.045

  FIG. 17 is a sectional view of the lens of Example 7. In the drawing, an imaging lens is a first lens L1 having a positive refractive power, a convex surface facing the object side in the vicinity of the optical axis, and both surfaces being aspherical in order from the object side. A second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 having a concave surface facing the image side near the axis, and a sixth lens having a negative refractive power and facing the image side near the optical axis Lens L6. The aperture stop S is disposed on the object side of the first lens L1, the image side surface of the sixth lens L6 is aspheric, and has an extreme value at a position other than the intersection with the optical axis. I indicates an imaging surface. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 18 is an aberration diagram of Example 7 (spherical aberration (a), astigmatism (b), distortion (c)). The spherical aberration curve shown in FIG. 18A is bent in the direction from the minus side to the plus side in the vicinity of the entrance pupil.

(Example 8)
Table 8 shows lens data of the imaging lens of Example 8.

[Table 8]
Example 8

f = 3.47mm fB = 0.29mm F = 1.86 2Y = 6.142mm
ENTP = 0mm EXTP = -2.15mm H1 = -1.46mm H2 = -3.18mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.306 0.93
2 * 1.522 0.517 1.54470 56.2 1.00
3 * 21.230 0.090 1.00
4 * 11.282 0.120 1.63470 23.9 0.99
5 * 2.628 0.407 0.95
6 * 9.184 0.387 1.54470 56.2 1.02
7 * -149.803 0.315 1.14
8 * 15.792 0.142 1.63470 23.9 1.23
9 * 5.336 0.207 1.35
10 * 8.259 0.547 1.54470 56.2 1.46
11 * -1.405 0.494 1.65
12 * -3.050 0.205 1.54470 56.2 2.24
13 * 1.796 0.430 2.48
14 ∞ 0.110 1.51630 64.1 2.86
15 ∞ 2.90

Aspheric coefficient

2nd side 8th side
K = 0.14286E + 00 K = 0.00000E + 00
A4 = 0.64685E-02 A4 = -0.14197E + 00
A6 = -0.31130E-02 A6 = -0.44007E-03
A8 = -0.36237E-02 A8 = -0.10057E-01
A10 = 0.17445E-01 A10 = 0.25871E-02
A12 = 0.88417E-02 A12 = -0.13557E-02
A14 = -0.22560E-01 A14 = 0.00000E + 00

3rd side 9th side
K = 0.77826E + 02 K = -0.79333E + 02
A3 = 0.00000E + 00 A3 = 0.26567E-01
A4 = 0.17925E-01 A4 = -0.18588E + 00
A5 = 0.00000E + 00 A5 = 0.12084E-01
A6 = -0.39135E-02 A6 = 0.93587E-02
A8 = 0.24744E-01 A8 = -0.43153E-02
A10 = -0.23232E-01 A10 = 0.19058E-02
A12 = -0.27481E-01 A12 = -0.34880E-02
A14 = 0.91360E-02 A14 = 0.28555E-02

4th page 10th page
K = 0.56108E + 02 K = 0.18459E + 02
A3 = 0.00000E + 00 A3 = -0.51779E-01
A4 = -0.30992E-01 A4 = 0.35134E-01
A5 = 0.00000E + 00 A5 = -0.13208E + 00
A6 = 0.12609E + 00 A6 = 0.11649E-01
A8 = -0.69373E-01 A8 = 0.33024E-01
A10 = -0.55544E-01 A10 = -0.11816E-01
A12 = 0.58858E-02 A12 = -0.57577E-02
A14 = 0.31866E-01 A14 = 0.29070E-02

5th surface 11th surface
K = -0.14026E + 02 K = -0.11084E + 02
A3 = 0.00000E + 00 A3 = -0.13784E + 00
A4 = 0.83127E-01 A4 = -0.19569E-01
A5 = 0.00000E + 00 A5 = 0.29842E-01
A6 = 0.72834E-01 A6 = 0.16782E-01
A8 = -0.58790E-02 A8 = -0.11906E-01
A10 = -0.26887E-01 A10 = 0.22006E-02
A12 = -0.33396E-01 A12 = 0.10753E-02
A14 = 0.79587E-01 A14 = -0.35625E-03

6th page 12th page
K = 0.75953E + 02 K = -0.41638E + 01
A3 = -0.18567E-01 A3 = -0.10260E + 00
A4 = -0.21489E-01 A4 = 0.95406E-02
A5 = -0.10657E + 00 A5 = 0.85645E-02
A6 = 0.50853E-02 A6 = 0.61350E-02
A8 = 0.37424E-01 A8 = -0.26831E-03
A10 = -0.18955E-01 A10 = -0.12959E-03
A12 = -0.41456E-01 A12 = 0.66803E-05
A14 = 0.17568E-01 A14 = 0.64384E-06

7th 13th
K = 0.00000E + 00 K = -0.11511E + 02
A3 = 0.00000E + 00 A3 = -0.83790E-01
A4 = -0.59044E-01 A4 = 0.18461E-01
A5 = 0.00000E + 00 A5 = -0.65300E-03
A6 = -0.69264E-01 A6 = -0.12049E-02
A8 = 0.40873E-02 A8 = -0.35094E-03
A10 = 0.20695E-01 A10 = 0.47950E-04
A12 = -0.22194E-01 A12 = -0.93769E-05
A14 = 0.00000E + 00 A14 = 0.13762E-05

Single lens data

Lens Start surface Focal length (mm)
1 2 2.983
2 4 -5.428
3 6 15.901
4 8 -12.765
5 10 2.250
6 12 -2.045

  FIG. 19 is a sectional view of the lens of Example 8. In the drawing, an imaging lens is a first lens L1 having a positive refractive power, a convex surface facing the object side in the vicinity of the optical axis, and both surfaces being aspherical in order from the object side. A second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 having a concave surface facing the image side near the axis, and a sixth lens having a negative refractive power and facing the image side near the optical axis Lens L6. The aperture stop S is disposed on the object side of the first lens L1, the image side surface of the sixth lens L6 is aspheric, and has an extreme value at a position other than the intersection with the optical axis. I indicates an imaging surface. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 20 is an aberration diagram of Example 8 (spherical aberration (a), astigmatism (b), distortion (c)). The spherical aberration curve shown in FIG. 20A is bent in the direction from the minus side to the plus side in the vicinity of the entrance pupil.

Example 9
Table 9 shows lens data of the imaging lens of Example 9.

[Table 9]
Example 9

f = 3.48mm fB = 0.31mm F = 1.86 2Y = 6.142mm
ENTP = 0mm EXTP = -2.15mm H1 = -1.46mm H2 = -3.17mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.316 0.93
2 * 1.517 0.512 1.54470 56.2 1.00
3 * 17.413 0.086 0.99
4 * 11.465 0.120 1.63470 23.9 0.98
5 * 2.697 0.403 0.95
6 * 9.075 0.371 1.54470 56.2 1.02
7 * -91.487 0.322 1.13
8 * 19.647 0.150 1.63470 23.9 1.22
9 * 5.908 0.216 1.35
10 * 9.512 0.545 1.54470 56.2 1.46
11 * -1.340 0.456 1.66
12 * -3.104 0.209 1.54470 56.2 2.26
13 * 1.670 0.450 2.50
14 ∞ 0.110 1.51630 64.1 2.87
15 ∞ 2.90

Aspheric coefficient

2nd side 8th side
K = 0.14536E + 00 K = 0.00000E + 00
A4 = 0.66939E-02 A4 = -0.14374E + 00
A6 = -0.63672E-03 A6 = -0.14520E-02
A8 = -0.50542E-02 A8 = -0.10414E-01
A10 = 0.15850E-01 A10 = 0.25054E-02
A12 = 0.87889E-02 A12 = -0.14428E-02
A14 = -0.19679E-01 A14 = 0.00000E + 00

3rd side 9th side
K = 0.38699E + 02 K = -0.80000E + 02
A3 = 0.00000E + 00 A3 = 0.23524E-01
A4 = 0.16198E-01 A4 = -0.18514E + 00
A5 = 0.00000E + 00 A5 = 0.11615E-01
A6 = -0.18974E-03 A6 = 0.89849E-02
A8 = 0.23327E-01 A8 = -0.42709E-02
A10 = -0.23095E-01 A10 = 0.20359E-02
A12 = -0.28262E-01 A12 = -0.33742E-02
A14 = 0.11295E-01 A14 = 0.29387E-02

4th page 10th page
K = 0.63918E + 02 K = 0.16720E + 02
A3 = 0.00000E + 00 A3 = -0.38780E-01
A4 = -0.29112E-01 A4 = 0.31241E-01
A5 = 0.00000E + 00 A5 = -0.13191E + 00
A6 = 0.12439E + 00 A6 = 0.12043E-01
A8 = -0.65624E-01 A8 = 0.32966E-01
A10 = -0.54965E-01 A10 = -0.11867E-01
A12 = 0.47399E-02 A12 = -0.57532E-02
A14 = 0.29779E-01 A14 = 0.29312E-02

5th surface 11th surface
K = -0.14554E + 02 K = -0.10478E + 02
A3 = 0.00000E + 00 A3 = -0.13530E + 00
A4 = 0.84650E-01 A4 = -0.18470E-01
A5 = 0.00000E + 00 A5 = 0.29559E-01
A6 = 0.73784E-01 A6 = 0.16461E-01
A8 = -0.56923E-02 A8 = -0.11991E-01
A10 = -0.23613E-01 A10 = 0.21847E-02
A12 = -0.29866E-01 A12 = 0.10743E-02
A14 = 0.74674E-01 A14 = -0.35420E-03

6th page 12th page
K = 0.74415E + 02 K = -0.42628E + 01
A3 = -0.16178E-01 A3 = -0.10206E + 00
A4 = -0.26099E-01 A4 = 0.96090E-02
A5 = -0.10600E + 00 A5 = 0.85789E-02
A6 = 0.80690E-02 A6 = 0.61361E-02
A8 = 0.36793E-01 A8 = -0.26957E-03
A10 = -0.24615E-01 A10 = -0.12999E-03
A12 = -0.43775E-01 A12 = 0.66178E-05
A14 = 0.23351E-01 A14 = 0.65757E-06

7th 13th
K = 0.00000E + 00 K = -0.11394E + 02
A3 = 0.00000E + 00 A3 = -0.82809E-01
A4 = -0.64218E-01 A4 = 0.18770E-01
A5 = 0.00000E + 00 A5 = -0.63303E-03
A6 = -0.67752E-01 A6 = -0.12127E-02
A8 = 0.34047E-02 A8 = -0.35292E-03
A10 = 0.19102E-01 A10 = 0.47720E-04
A12 = -0.23399E-01 A12 = -0.94028E-05
A14 = 0.00000E + 00 A14 = 0.13725E-05

Single lens data

Lens Start surface Focal length (mm)
1 2 3.016
2 4 -5.586
3 6 15.177
4 8 -13.369
5 10 2.195
6 12 -1.963

  FIG. 21 is a sectional view of the lens of Example 9. In the drawing, an imaging lens is a first lens L1 having a positive refractive power, a convex surface facing the object side in the vicinity of the optical axis, and both surfaces being aspherical in order from the object side. A second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 having a concave surface facing the image side near the axis, and a sixth lens having a negative refractive power and facing the image side near the optical axis Lens L6. The aperture stop S is disposed on the object side of the first lens L1, the image side surface of the sixth lens L6 is aspheric, and has an extreme value at a position other than the intersection with the optical axis. I indicates an imaging surface. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 22 is an aberration diagram of Example 9 (spherical aberration (a), astigmatism (b), distortion (c)). The spherical aberration curve shown in FIG. 22A is bent in the direction from the minus side to the plus side in the vicinity of the entrance pupil.

(Example 10)
Table 10 shows lens data of the imaging lens of Example 10.

[Table 10]
Example 10

f = 3.33mm fB = 0.19mm F = 1.86 2Y = 6.142mm
ENTP = 0mm EXTP = -2.3mm H1 = -1.13mm H2 = -3.14mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.242 0.90
2 * 1.644 0.462 1.54000 45.1 0.98
3 * -116.879 0.084 0.99
4 * -858.208 0.120 1.63470 23.9 0.98
5 * 3.182 0.340 0.97
6 * 9.399 0.452 1.54000 45.0 1.05
7 * -4.992 0.251 1.12
8 * -7.224 0.274 1.63470 23.9 1.16
9 * 7.369 0.171 1.39
10 * 30.898 1.031 1.54000 45.0 1.46
11 * -1.176 0.474 1.67
12 * 28.764 0.300 1.56640 34.8 2.07
13 * 1.064 0.402 2.73
14 ∞ 0.110 1.51630 64.1 2.92
15 ∞ 2.96

Aspheric coefficient

2nd side 8th side
K = 0.15407E + 00 K = 0.00000E + 00
A4 = 0.23097E-02 A4 = -0.15996E + 00
A6 = 0.15816E-01 A6 = -0.25274E-01
A8 = -0.31469E-02 A8 = -0.13882E-01
A10 = 0.42548E-02 A10 = 0.55079E-02
A12 = -0.27530E-02 A12 = 0.68234E-02
A14 = -0.88857E-02 A14 = 0.00000E + 00

3rd side 9th side
K = -0.80000E + 02 K = -0.51081E + 02
A3 = 0.00000E + 00 A3 = 0.18015E-01
A4 = 0.14731E-01 A4 = -0.16850E + 00
A5 = 0.00000E + 00 A5 = 0.20624E-01
A6 = 0.19139E-01 A6 = 0.13804E-01
A8 = 0.33629E-01 A8 = -0.25115E-02
A10 = -0.85079E-01 A10 = 0.20491E-02
A12 = -0.25298E-01 A12 = -0.32087E-02
A14 = 0.41704E-01 A14 = 0.19158E-02

4th page 10th page
K = 0.80000E + 02 K = -0.79994E + 02
A3 = 0.00000E + 00 A3 = -0.36859E-01
A4 = -0.19534E-01 A4 = 0.42130E-01
A5 = 0.00000E + 00 A5 = -0.12039E + 00
A6 = 0.11330E + 00 A6 = 0.15172E-01
A8 = -0.84611E-01 A8 = 0.30456E-01
A10 = -0.63903E-01 A10 = -0.93945E-02
A12 = 0.28660E-01 A12 = -0.46416E-02
A14 = 0.34209E-01 A14 = 0.22343E-02

5th surface 11th surface
K = -0.23169E + 02 K = -0.62059E + 01
A3 = 0.00000E + 00 A3 = -0.12109E + 00
A4 = 0.78664E-01 A4 = -0.36990E-01
A5 = 0.00000E + 00 A5 = 0.19293E-01
A6 = 0.25701E-01 A6 = 0.13946E-01
A8 = -0.14041E-01 A8 = -0.10374E-01
A10 = -0.58359E-03 A10 = 0.17189E-02
A12 = -0.26518E-02 A12 = 0.91181E-03
A14 = 0.29962E-01 A14 = -0.24272E-03

6th page 12th page
K = 0.72828E + 02 K = -0.52031E + 02
A3 = -0.10654E-01 A3 = -0.17704E + 00
A4 = 0.44872E-02 A4 = 0.30546E-02
A5 = -0.77381E-01 A5 = 0.83878E-02
A6 = 0.95256E-02 A6 = 0.67674E-02
A8 = 0.16013E-01 A8 = -0.17671E-03
A10 = -0.17804E-01 A10 = -0.14681E-03
A12 = -0.21501E-01 A12 = -0.21636E-05
A14 = 0.10857E-01 A14 = 0.26424E-05

7th 13th
K = 0.00000E + 00 K = -0.57457E + 01
A3 = 0.00000E + 00 A3 = -0.81481E-01
A4 = -0.41586E-01 A4 = 0.17132E-01
A5 = 0.00000E + 00 A5 = 0.11302E-02
A6 = -0.62547E-01 A6 = 0.26515E-03
A8 = -0.73870E-04 A8 = -0.50226E-03
A10 = 0.15832E-01 A10 = 0.72053E-04
A12 = -0.18035E-01 A12 = -0.58229E-05
A14 = 0.00000E + 00 A14 = 0.24528E-06

Single lens data

Lens Start surface Focal length (mm)
1 2 3.005
2 4 -4.995
3 6 6.105
4 8 -5.706
5 10 2.122
6 12 -1.959

  FIG. 23 is a sectional view of the lens of Example 10. In the drawing, an imaging lens is a first lens L1 having a positive refractive power, a convex surface facing the object side in the vicinity of the optical axis, and both surfaces being aspherical in order from the object side. A second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 having a concave surface facing the image side near the axis, and a sixth lens having a negative refractive power and facing the image side near the optical axis Lens L6. The aperture stop S is disposed on the object side of the first lens L1, the image side surface of the sixth lens L6 is aspheric, and has an extreme value at a position other than the intersection with the optical axis. I indicates an imaging surface. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 24 is an aberration diagram of Example 10 (spherical aberration (a), astigmatism (b), distortion (c)). The spherical aberration curve shown in FIG. 24A is bent in the direction from the minus side toward the plus side in the vicinity of the entrance pupil.

  Table 11 shows values of the respective examples corresponding to the respective conditional expressions.

  Table 12 shows combinations of lens materials suitable for the present invention. However, it is not limited to this.

  In recent years, as a method for mounting image pickup devices at low cost and in large quantities, a reflow process (heating process) is performed on a substrate on which solder is previously potted while an IC chip and other electronic components and optical elements are placed on the substrate. A technique has been proposed in which an electronic component and an optical element are simultaneously mounted on a substrate by melting the substrate.

  In order to perform mounting using such a reflow process, it is necessary to heat the optical element to about 200 to 260 degrees together with the electronic components. However, in such a high temperature, a lens using a thermoplastic resin is thermally deformed. However, there is a problem that the optical performance deteriorates due to discoloration. As one of the methods for solving such a problem, a technology has been proposed that uses a glass mold lens having excellent heat resistance and achieves both miniaturization and optical performance in a high temperature environment. Since the cost is higher than the lens used, there is a problem that it is difficult to meet the demand for cost reduction of the imaging device.

  Therefore, by using an energy curable resin as the material of the imaging lens, since the optical performance degradation when exposed to high temperatures is small compared to a lens using a thermoplastic resin such as polycarbonate or polyolefin, It is effective for the reflow process, is easier to manufacture than a glass mold lens, is inexpensive, and can achieve both low cost and mass productivity of an imaging apparatus incorporating an imaging lens. The energy curable resin refers to both a thermosetting resin and an ultraviolet curable resin.

  The imaging lens of the present invention may be formed using the above-described energy curable resin.

  In the present embodiment, the chief ray incident angle of the light beam incident on the imaging surface of the solid-state imaging device is not necessarily designed to be sufficiently small at the periphery of the imaging surface. However, recent techniques have made it possible to reduce shading by reviewing the arrangement of the color filters of the solid-state imaging device and the on-chip microlens array. Specifically, if the pitch of the arrangement of the color filters and the on-chip microlens array is set slightly smaller than the pixel pitch of the image pickup surface of the image pickup device, the color filter or Since the on-chip microlens array is shifted to the optical axis side of the imaging lens, the obliquely incident light beam can be efficiently guided to the light receiving portion of each pixel. Thereby, the shading which generate | occur | produces with a solid-state image sensor can be restrained small. The present embodiment is a design example aiming at further miniaturization with respect to the portion where the requirement is relaxed.

  According to the present invention, an imaging lens suitable for a small portable terminal can be provided.

10 imaging lens 50 imaging unit 51 imaging element 51a photoelectric conversion unit 52 substrate 53 barrel 53a flange unit 54 optical filter 55 actuator 55a carrier 55b coil 55c magnet 55d yoke 56 circuit board 57 seat member 57a side wall 57b upper wall 57c opening 60 Input unit 70 Touch panel 80 Wireless communication unit 91 Storage unit 92 Temporary storage unit 100 Smartphone 101 Control unit I Imaging surface F IR cut filters L1 to L6 Lens S Aperture stop

Claims (12)

An imaging lens for forming a subject image on a photoelectric conversion unit of a solid-state imaging device,
From the object side,
A first lens having a positive refractive power and having a convex surface facing the object side in the vicinity of the optical axis and both surfaces being aspherical;
A second lens having negative refractive power and having a concave surface facing the image side in the vicinity of the optical axis;
A third lens having a positive refractive power ;
A fourth lens having negative refractive power ;
A fifth lens having a positive refractive power ;
A sixth lens having negative refractive power and having a concave surface facing the image side in the vicinity of the optical axis,
An aperture stop is disposed on the object side of the first lens or between the first lens and the second lens;
The image side surface of the sixth lens is aspheric, and has an extreme value at a position other than the intersection with the optical axis,
An imaging lens satisfying the following conditional expression:
0.66 ≦ DEV2S1 / EDiaS1 ≦ 0.97 (1)
0.48 <DEV1S2 / EDiaS2 <0.97 (2)
0.60 <f1 × tan ω / Y <0.95 (3)
−0.60 <f6 × tan ω / Y ≦ −0.43 (4)
However,
DEV2S1: Distance (mm) from the optical axis at the position where the value of the second derivative of the first lens object side surface sag amount becomes the maximum value within the effective diameter.
EdiaS1: Effective radius (mm) of the side surface of the first lens object
DEV1S2: Distance (mm) from the optical axis at the position where the value of the first derivative of the first lens image side surface sag amount is the maximum value within the effective diameter.
EdiaS2: Effective radius (mm) of the side surface of the first lens image
f1: Focal length (mm) of the first lens
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens
f6: Focal length (mm) of the sixth lens The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
-1.9 <f2 × tan ω / Y <−1.0 (5)
However,
f2: Focal length (mm) of the second lens
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
1.5 <f3 × tan ω / Y <7.5 (6)
However,
f3: Focal length (mm) of the third lens
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
0.38 <r1 × tan ω / Y <0.55 (7)
However,
r1: curvature radius (mm) of the side surface of the first lens object
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
0.6 <r4 × tan ω / Y <1.8 (8)
However,
r4: radius of curvature of the side surface of the second lens image (mm)
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
0.02 <THIL2 × tan ω / Y <0.07 (9)
However,
THIL2: thickness on the optical axis of the second lens (mm)
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
0.055 <THIL6 × tan ω / Y <0.145 (10)
However,
THIL6: thickness of the sixth lens on the optical axis (mm)
ω: Maximum angle of view of the imaging lens (°)
Y: Maximum image height (mm) of the imaging lens The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
10 <| ν3-ν4 | <55 (11)
However,
ν3: Abbe number of the third lens ν4: Abbe number of the fourth lens The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
20 <ν1-ν2 <55 (12)
However,
ν1: Abbe number of the first lens ν2: Abbe number of the second lens   10. The imaging lens according to claim 1, wherein an object side surface of the sixth lens has an aspheric shape and has an extreme value at a position other than an intersection with the optical axis. Imaging apparatus characterized by having an imaging lens according to item 1 to claim 1-10. A portable terminal comprising the imaging device according to claim 11 .

Images