JP6300183B2 - 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, an imaging lens that is brighter than F2.4, which is suitable for an imaging device with high pixel size, miniaturization, and miniaturization has been demanded. 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 the above problems, and has a six-image structure having a brightness of F2.4 or higher, 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 a parallel light beam parallel to the optical axis is 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) '

An imaging lens according to the present invention is an imaging lens for forming a subject image on a photoelectric conversion unit of a solid-state imaging device,
A first lens having a brightness of F2.4 or more, having a positive refractive power in order from the object side, a convex surface facing the object side in the vicinity of the optical axis, and a curvature that is stronger on the object side than on the image side A second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens, a fifth lens, and a sixth lens having a negative refractive power and having a concave surface facing the image side in the vicinity of the optical axis Consists of
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 aperture stop is disposed closer to the object side than the side surface of the second lens image;
The following conditional expression is satisfied.
40.0 <ν3 <65.0 (1)
0.073 <d8 / f <0.15 (2)
2.00 <f3 / f <5.50 (5) ′
0.45 <r4 / f <0.85 (7) ′
However,
ν3: Abbe number of the third lens d8: Air interval on the optical axis of the fourth lens and the fifth lens (mm)
f: Focal length (mm) of the entire imaging lens system
f3: Focal length (mm) of the third lens
r4: radius of curvature (mm) of the side surface of the second lens image

  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 in the vicinity of the optical axis, and the object side rather than the image side surface. The first lens having a stronger curvature on the side surface, the second lens having a negative refractive power, the third lens having a positive refractive power, the fourth lens, the fifth lens, and the vicinity of the optical axis having a negative refractive power 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, the object side surface of the first lens is convex, and the object side surface has a stronger curvature than the image side surface, so that the combined principal point position of the entire imaging lens system can be moved closer to the object side. This is advantageous for reducing the overall length of the lens.

  In addition, by using a so-called triplet type in which the third lens is a positive lens and the first lens to the third lens are arranged in order of positive and negative, it is possible to satisfactorily correct spherical aberration and curvature of field. it can.

  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 closer to the object side than the side surface of the second lens image, it is possible to achieve both reduction in the overall length of the imaging lens and good telecentric characteristics. Furthermore, by setting the F-number of the imaging lens to a brightness of F2.4 or higher (F value is small), an imaging lens that can cope with recent high performance can be obtained.

Conditional expression (1) defines the Abbe number of the material of the third lens and is a conditional expression for correcting the chromatic aberration of the entire imaging lens in a well-balanced manner. By configuring the third lens with a material in the range of conditional expression (1), it is possible to correct axial chromatic aberration and lateral chromatic aberration with a good balance. More preferably, the range of the following formula is good.
45.0 <ν3 <60.0 (1) ′

Conditional expression (2) is a conditional expression for appropriately setting the air space on the optical axis of the fourth lens and the fifth lens. When the value of the conditional expression (2) exceeds the lower limit, the fourth lens and the fifth lens are not brought too close to each other, and the fourth lens and the fifth lens having a large aspheric amount in the peripheral portion are close to each other. It is possible to reduce performance deterioration when eccentricity occurs. On the other hand, since the value of conditional expression (2) is less than the upper limit, the third lens and the fourth lens can be appropriately separated, and thus the light flux of each image height passing through the fourth lens is individually corrected for aberration. You can make it easier. In particular, in a lens system having a brightness of F2.4 or higher, it is difficult to ensure the peripheral performance, so it is important to individually correct the aberration of each luminous flux at each image height. More preferably, the range of the following formula is good.
0.05 <d8 / f <0.13 (2) ′

  An imaging apparatus according to the present invention includes the imaging lens.

  The portable terminal by this invention has the said imaging device, It is characterized by the above-mentioned.

  According to the present invention, there are provided a six-lens imaging lens having a brightness of F2.4 or more, in which various aberrations are favorably corrected while being smaller than the conventional type, and an imaging device and a portable terminal using the imaging lens. 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), and meridional coma aberration (d)). 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), and meridional coma aberration (d)). 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), and meridional coma aberration (d)). 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), and meridional coma aberration (d)). 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), and meridional coma aberration (d)). 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), and meridional coma aberration diagram (d)).

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the imaging unit 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 it to a predetermined circuit on the substrate 52 via a wire (not shown). 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 imaging lens 10 disposed in the lens barrel 53 has, in order from the object side, a positive refractive power, a convex surface facing the object side in the vicinity of the optical axis, and a curvature (small curvature) that is stronger on the object side than on the image side. A first lens L1 having a radius), a second lens L2 having a negative refractive power, a third lens L3 having a positive refractive power, a fourth lens L4, a fifth lens L5, and an optical axis having a negative refractive power. The sixth lens L6 has a concave surface facing the image side in the vicinity. For the first lenses L1 to L5, the flanges are directly butted to adjust the distance in the optical axis direction, and light-shielding stops SH1 to SH4 are provided inside the butted flanges. The fifth lens L5 and the sixth lens L6 adjust the distance in the optical axis direction by interposing a light-shielding stop SH5 between the flanges.

The image side surface of the second lens L2 has a shape that monotonously falls toward the image side as the distance from the optical axis increases. The third lens L3 has a shape that falls to the object side at the periphery. The image side surface of the sixth lens L6 has an aspheric shape, and has an extreme value P (only one side is shown) at a position other than the intersection with the optical axis. The aperture stop S is disposed on the object side of the image side surface of the second lens L2, and is provided on the object side of the first lens L1 here. The imaging lens 10 satisfies the following conditional expression.
40.0 <ν3 <65.0 (1)
0.05 <d8 / f <0.15 (2)
However,
ν3: Abbe number of the third lens L3 d8: Air interval on the optical axis of the fourth lens L4 and the fifth lens L5 (mm)
f: Focal length (mm) of the entire imaging lens 10 system

  The operation of the imaging unit 50 described above will be described. FIGS. 3A and 3B are diagrams illustrating a state in which the imaging unit 50 is mounted on a 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 lens barrel 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 unit 60 and can touch the icon 71 and the like displayed on the touch panel (display unit) 70 to operate the imaging unit 50 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 by 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 further, a wireless communication unit It is transmitted to the outside as video information via 80.

[Example]

Examples of the imaging lens of the present invention will be shown below. Symbols used in each example are as follows. The unit of length is mm.
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 final surface to rear principal point position)
R: radius of curvature D: axial distance Nd: refractive index νd of lens material with respect to d-line: Abbe number of lens material

  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 height in the direction perpendicular to the optical axis is h, and is expressed by the following “Equation 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 = 0.38mm F = 2.08 2Y = 5.842mm
ENTP = 0mm EXTP = -2.06mm H1 = -1.87mm H2 = -3.3mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.24 0.88
2 * 1.483 0.47 1.54470 56.2 0.91
3 * 171.642 0.09 0.91
4 * 35.177 0.15 1.63470 23.9 0.91
5 * 2.761 0.39 0.89
6 * 11.100 0.39 1.54470 56.2 0.97
7 * -14.430 0.13 1.09
8 * -5.348 0.20 1.63470 23.9 1.12
9 * -11.205 0.40 1.24
10 * -22.120 0.54 1.54470 56.2 1.44
11 * -1.201 0.42 1.71
12 * -2.732 0.31 1.54470 56.2 2.36
13 * 1.511 0.40 2.56
14 ∞ 0.11 1.51630 64.1 3.00
15 ∞ 3.00

Aspheric coefficient

2nd side 8th side
K = 0.11064E + 00 K = 0.0
A4 = 0.77619E-02 A4 = -0.83830E-01
A6 = -0.14994E-02 A6 = -0.72201E-02
A8 = -0.14046E-02 A8 = -0.12901E-02
A10 = 0.18350E-01 A10 = -0.69251E-02
A12 = 0.49521E-02 A12 = 0.52899E-02
A14 = -0.29657E-01

3rd side 9th side
K = -0.80000E + 02 K = 0.33633E + 02
A4 = 0.22449E-01 A3 = 0.12200E-01
A6 = 0.10582E-01 A4 = -0.12793E + 00
A8 = 0.17426E-01 A5 = 0.28268E-01
A10 = -0.33613E-01 A6 = -0.64956E-02
A12 = -0.33805E-01 A8 = -0.76012E-02
A14 = 0.18767E-01 A10 = 0.10413E-01
A12 = -0.15621E-02
A14 = 0.34072E-02

4th page 10th page
K = -0.80000E + 02 K = -0.75104E + 02
A4 = -0.16460E-01 A3 = -0.81216E-01
A6 = 0.13414E + 00 A4 = 0.15296E + 00
A8 = -0.70650E-01 A5 = -0.14967E + 00
A10 = -0.51751E-01 A6 = -0.85533E-02
A12 = 0.18357E-01 A8 = 0.37480E-01
A14 = 0.30319E-01 A10 = -0.14685E-01
A12 = -0.76921E-02
A14 = 0.40260E-02

5th surface 11th surface
K = -0.11872E + 02 K = -0.55040E + 01
A3 = -0.25270E-01 A3 = -0.72660E-01
A4 = 0.99110E-01 A4 = -0.22212E-01
A5 = -0.10822E-01 A5 = 0.23796E-01
A6 = 0.54576E-01 A6 = 0.22744E-01
A8 = 0.20300E-01 A8 = -0.14054E-01
A10 = -0.20055E-02 A10 = 0.15688E-02
A12 = -0.29972E-01 A12 = 0.13325E-02
A14 = 0.77829E-01 A14 = -0.37055E-03

6th page 12th page
K = 0.74735E + 02 K = -0.28647E + 01
A3 = 0.96936E-02 A3 = -0.84014E-01
A4 = -0.79431E-01 A4 = 0.58462E-02
A5 = -0.88704E-01 A5 = 0.81861E-02
A6 = 0.34259E-01 A6 = 0.72514E-02
A8 = 0.11055E-04 A8 = -0.26347E-03
A10 = -0.39325E-01 A10 = -0.16534E-03
A12 = -0.21838E-03 A12 = 0.50431E-05
A14 = 0.20072E-01 A14 = 0.12351E-05

7th 13th
K = 0.0 K = -0.98202E + 01
A4 = -0.43177E-01 A3 = -0.96722E-01
A6 = -0.70355E-01 A4 = 0.14664E-01
A8 = -0.12578E-01 A5 = 0.56974E-02
A10 = 0.22162E-01 A6 = -0.81339E-03
A12 = -0.25624E-01 A8 = -0.99909E-03
A10 = 0.74992E-04
A12 = 0.98469E-06
A14 = 0.40160E-06

Single lens data

Lens Start surface Focal length (mm)
1 2 2.743
2 4 -4.728
3 6 11.580
4 8 -16.335
5 10 2.310
6 12 -1.741

  5 is a sectional view of the lens of Example 1. FIG. In the figure, a first lens L1 having a positive refractive power and a convex surface facing the object side in the vicinity of the optical axis and having a curvature that is stronger on the object side surface than on the image side surface, a second lens L2 having a negative refractive power, A third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a positive refractive power, and having a negative refractive power and a concave surface facing the image side in the vicinity of the optical axis The sixth lens L6. The F number is 2.08. The aperture stop S is disposed closer to the object side than the effective diameter of the object side surface of the first lens L1. 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 aberration (c), and meridional coma aberration diagram (d)). Here, in the spherical aberration diagram and the meridional coma 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, respectively. In the astigmatism diagram, the solid line S represents the sagittal surface and the dotted line M. Represents a meridional plane (hereinafter the same).

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

[Table 2]
Example 2

f = 3.68mm fB = 0.22mm F = 2.06 2Y = 5.842mm
ENTP = 0mm EXTP = -2.29mm H1 = -1.7mm H2 = -3.45mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.25 0.89
2 * 1.502 0.50 1.54470 56.2 0.92
3 * -109.088 0.08 0.92
4 * 19.666 0.15 1.63470 23.9 0.91
5 * 2.544 0.43 0.90
6 * 26.009 0.38 1.54470 56.2 0.99
7 * -6.913 0.10 1.10
8 * -3.318 0.20 1.63470 23.9 1.14
9 * -4.723 0.42 1.24
10 * -13.234 0.58 1.54470 56.2 1.44
11 * -1.109 0.35 1.70
12 * -3.182 0.31 1.54470 56.2 2.38
13 * 1.286 0.60 2.58
14 ∞ 0.11 1.51630 64.1 3.00
15 ∞ 3.00

Aspheric coefficient

2nd side 8th side
K = 0.12069E + 00 K = 0.0
A4 = 0.62128E-02 A4 = -0.41360E-01
A6 = 0.27993E-02 A6 = -0.14427E-02
A8 = -0.13978E-04 A8 = -0.48378E-02
A10 = 0.15304E-01 A10 = -0.46095E-02
A12 = 0.81189E-02 A12 = 0.54066E-02
A14 = -0.24586E-01

3rd side 9th side
K = 0.78940E + 02 K = -0.86499E + 01
A4 = 0.24770E-01 A3 = 0.12179E-01
A6 = 0.21902E-01 A4 = -0.10842E + 00
A8 = 0.87637E-02 A5 = 0.27021E-01
A10 = -0.45072E-01 A6 = -0.85621E-02
A12 = -0.32233E-01 A8 = -0.71771E-02
A14 = 0.23275E-01 A10 = 0.11311E-01
A12 = -0.14557E-02
A14 = 0.27447E-02

4th page 10th page
K = -0.61452E + 01 K = 0.79990E + 02
A4 = -0.21904E-01 A3 = -0.71966E-01
A6 = 0.12725E + 00 A4 = 0.14033E + 00
A8 = -0.76644E-01 A5 = -0.16729E + 00
A10 = -0.69816E-01 A6 = -0.31809E-02
A12 = 0.38044E-02 A8 = 0.46165E-01
A14 = 0.43961E-01 A10 = -0.16904E-01
A12 = -0.86245E-02
A14 = 0.47722E-02

5th surface 11th surface
K = -0.11453E + 02 K = -0.53254E + 01
A3 = -0.24116E-01 A3 = -0.59461E-01
A4 = 0.10536E + 00 A4 = -0.37309E-01
A5 = -0.22029E-02 A5 = 0.15122E-01
A6 = 0.40139E-01 A6 = 0.20470E-01
A8 = -0.53939E-02 A8 = -0.12854E-01
A10 = -0.11449E-02 A10 = 0.23633E-02
A12 = -0.18688E-01 A12 = 0.14302E-02
A14 = 0.67803E-01 A14 = -0.45843E-03

6th page 12th page
K = 0.42598E + 02 K = -0.34183E + 01
A3 = 0.18653E-01 A3 = -0.78483E-01
A4 = -0.10541E + 00 A4 = 0.41369E-02
A5 = -0.52108E-01 A5 = 0.71609E-02
A6 = 0.45716E-01 A6 = 0.68382E-02
A8 = -0.31439E-01 A8 = -0.20906E-03
A10 = -0.35417E-01 A10 = -0.14898E-03
A12 = 0.21941E-01 A12 = 0.60853E-05
A14 = 0.68957E-02 A14 = 0.85025E-06

7th 13th
K = 0.0 K = -0.91159E + 01
A4 = -0.47259E-01 A3 = -0.82494E-01
A6 = -0.49230E-01 A4 = 0.99966E-02
A8 = -0.10531E-01 A5 = 0.41382E-02
A10 = 0.63567E-02 A6 = -0.27724E-03
A12 = -0.17266E-01 A8 = -0.84719E-03
A10 = 0.76953E-04
A12 = -0.53432E-06
A14 = 0.34889E-06

Single lens data

Lens Start surface Focal length (mm)
1 2 2.725
2 4 -4.619
3 6 10.067
4 8 -18.588
5 10 2.185
6 12 -1.641

  FIG. 7 is a sectional view of the lens of Example 2. In the figure, a first lens L1 having a positive refractive power and a convex surface facing the object side in the vicinity of the optical axis and having a curvature that is stronger on the object side surface than on the image side surface, a second lens L2 having a negative refractive power, A third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a positive refractive power, and having a negative refractive power and a concave surface facing the image side in the vicinity of the optical axis The sixth lens L6. The F number is 2.06. The aperture stop S is disposed closer to the object side than the effective diameter of the object side surface of the first lens L1. 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), and meridional coma aberration (d)).

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

[Table 3]
Example 3

f = 3.68mm fB = 0.42mm F = 1.84 2Y = 5.842mm
ENTP = 0mm EXTP = -2.18mm H1 = -1.51mm H2 = -3.26mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.29 1.00
2 * 1.599 0.58 1.54890 50.3 1.00
3 * 123.386 0.08 0.94
4 * 20.225 0.15 1.67750 20.1 0.90
5 * 2.930 0.48 0.82
6 * 8.071 0.34 1.54470 56.2 0.76
7 * 46.334 0.11 0.72
8 * 14.675 0.20 1.63470 23.9 0.70
9 * 7.088 0.39 0.68
10 * -22.390 0.68 1.54470 56.2 0.58
11 * -1.038 0.33 0.48
12 * -4.171 0.33 1.51530 56.6 0.24
13 * 1.107 0.40 0.13
14 ∞ 0.11 1.51630 64.1 0.07
15 ∞ 0.10

Aspheric coefficient

2nd side 8th side
K = 0.90136E-01 K = 0.0
A4 = 0.62088E-02 A4 = -0.12171E + 00
A6 = -0.31031E-03 A6 = -0.18544E-01
A8 = -0.91505E-02 A8 = -0.21266E-02
A10 = 0.16634E-01 A10 = -0.51285E-02
A12 = 0.87033E-02 A12 = 0.64902E-02
A14 = -0.21104E-01

3rd side 9th side
K = -0.17429E + 02 K = -0.23270E + 02
A4 = 0.10420E-01 A3 = 0.93551E-02
A6 = 0.16472E-01 A4 = -0.14221E + 00
A8 = 0.99197E-02 A5 = 0.20010E-01
A10 = -0.35411E-01 A6 = -0.11598E-01
A12 = -0.28804E-01 A8 = -0.11738E-01
A14 = 0.24644E-01 A10 = 0.70468E-02
A12 = -0.32261E-02
A14 = 0.31645E-02

4th page 10th page
K = -0.79883E + 02 K = 0.80000E + 02
A4 = -0.37041E-01 A3 = -0.74349E-01
A6 = 0.12556E + 00 A4 = 0.15344E + 00
A8 = -0.66051E-01 A5 = -0.14053E + 00
A10 = -0.47567E-01 A6 = -0.10310E-01
A12 = 0.15305E-01 A8 = 0.36495E-01
A14 = 0.28341E-01 A10 = -0.12425E-01
A12 = -0.70941E-02
A14 = 0.32450E-02

5th surface 11th surface
K = -0.15300E + 02 K = -0.55642E + 01
A3 = -0.18666E-01 A3 = -0.10000E + 00
A4 = 0.83056E-01 A4 = -0.33235E-01
A5 = -0.28818E-01 A5 = 0.21592E-01
A6 = 0.54738E-01 A6 = 0.24639E-01
A8 = 0.15866E-01 A8 = -0.13269E-01
A10 = -0.19605E-01 A10 = 0.14174E-02
A12 = -0.45484E-01 A12 = 0.12894E-02
A14 = 0.74296E-01 A14 = -0.32676E-03

6th page 12th page
K = 0.51365E + 02 K = -0.77089E + 00
A3 = -0.59682E-02 A3 = -0.10220E + 00
A4 = -0.25343E-01 A4 = 0.31977E-02
A5 = -0.94375E-01 A5 = 0.85425E-02
A6 = 0.11983E-01 A6 = 0.77410E-02
A8 = 0.45669E-02 A8 = -0.14940E-03
A10 = -0.31903E-01 A10 = -0.15309E-03
A12 = -0.57207E-02 A12 = 0.53890E-05
A14 = 0.42809E-02 A14 = 0.73836E-06

7th 13th
K = 0.0 K = -0.76119E + 01
A4 = -0.15724E-01 A3 = -0.97006E-01
A6 = -0.67167E-01 A4 = 0.17677E-01
A8 = -0.15241E-01 A5 = 0.59811E-02
A10 = 0.25420E-01 A6 = -0.11827E-02
A12 = -0.18803E-01 A8 = -0.97905E-03
A10 = 0.89522E-04
A12 = 0.16991E-05
A14 = -0.49666E-07

Single lens data

Lens Start surface Focal length (mm)
1 2 2.946
2 4 -5.075
3 6 17.886
4 8 -21.825
5 10 1.976
6 12 -1.663

  FIG. 9 is a sectional view of the lens of Example 3. In the figure, a first lens L1 having a positive refractive power and a convex surface facing the object side in the vicinity of the optical axis and having a curvature that is stronger on the object side surface than on the image side surface, a second lens L2 having a negative refractive power, A third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a positive refractive power, and having a negative refractive power and a concave surface facing the image side in the vicinity of the optical axis The sixth lens L6. The F number is 1.84. The aperture stop S is disposed closer to the object side than the effective diameter of the object side surface of the first lens L1. 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), and meridional coma aberration (d)).

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

[Table 4]
Example 4

f = 3.68mm fB = 0.3mm F = 1.86 2Y = 5.842mm
ENTP = 0mm EXTP = -2.26mm H1 = -1.62mm H2 = -3.38mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.33 0.99
2 * 1.574 0.55 1.54470 56.2 1.05
3 * 22.259 0.08 1.05
4 * 9.865 0.15 1.63470 23.9 1.04
5 * 2.638 0.40 0.99
6 * 8.320 0.43 1.54470 56.2 1.04
7 * 115.518 0.21 1.16
8 * 58.683 0.26 1.63470 23.9 1.19
9 * 9.787 0.27 1.37
10 * -62.209 0.73 1.54470 56.2 1.45
11 * -1.091 0.38 1.70
12 * -3.646 0.23 1.54470 56.2 2.36
13 * 1.273 0.49 2.59
14 ∞ 0.11 1.51630 64.1 2.87
15 ∞ 2.90

Aspheric coefficient

2nd side 8th side
K = 0.10282E + 00 K = 0.0
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

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

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

5th surface 11th surface
K = -0.16938E + 02 K = -0.63594E + 01
A4 = 0.69576E-01 A3 = -0.11351E + 00
A6 = 0.52759E-01 A4 = -0.32515E-01
A8 = -0.53316E-02 A5 = 0.18679E-01
A10 = -0.13632E-01 A6 = 0.18346E-01
A12 = -0.22016E-01 A8 = -0.99971E-02
A14 = 0.53342E-01 A10 = 0.19888E-02
A12 = 0.10348E-02
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 = 0.0 K = -0.87609E + 01
A4 = -0.70691E-01 A3 = -0.93249E-01
A6 = -0.50026E-01 A4 = 0.24764E-01
A8 = -0.23068E-02 A5 = -0.39222E-04
A10 = 0.13138E-01 A6 = -0.13579E-02
A12 = -0.15968E-01 A8 = -0.27480E-03
A10 = 0.71990E-04
A12 = -0.75005E-05
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

  FIG. 11 is a sectional view of the lens of Example 4. In the figure, a first lens L1 having a positive refractive power and a convex surface facing the object side in the vicinity of the optical axis and having a curvature that is stronger on the object side surface than on the image side surface, a second lens L2 having a negative refractive power, A third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a positive refractive power, and having a negative refractive power and a concave surface facing the image side in the vicinity of the optical axis The sixth lens L6. The F number is 1.86. The aperture stop S is disposed closer to the object side than the effective diameter of the object side surface of the first lens L1. 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), and meridional coma aberration (d)).

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

[Table 5]
Example 5

f = 3.56mm fB = 0.16mm F = 1.65 2Y = 5.842mm
ENTP = 0mm EXTP = -2.36mm H1 = -1.49mm H2 = -3.41mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.32 1.08
2 * 1.703 0.55 1.54470 56.2 1.08
3 * -229.504 0.05 1.02
4 * 4.175 0.15 1.63470 23.9 1.03
5 * 1.789 0.47 1.02
6 * 25.184 0.50 1.77250 49.5 1.09
7 * -9.595 0.23 1.23
8 * 6.387 0.20 1.63470 23.9 1.25
9 * 3.675 0.42 1.39
10 * -101.489 0.44 1.77250 49.5 1.56
11 * -2.236 0.66 1.74
12 * -3.067 0.31 1.54470 56.2 2.28
13 * 2.608 0.40 2.51
14 ∞ 0.11 1.51630 64.1 3.00
15 ∞ 3.00

Aspheric coefficient

2nd side 8th side
K = 0.15991E + 00 K = -0.50593E + 02
A4 = 0.55423E-02 A3 = -0.94510E-01
A6 = -0.44549E-03 A4 = -0.18138E + 00
A8 = -0.84127E-05 A5 = 0.13267E-01
A10 = 0.73967E-03 A6 = 0.84246E-02
A12 = 0.17638E-02 A8 = -0.48239E-02
A14 = -0.73550E-03 A10 = -0.61201E-03
A12 = 0.54320E-02

3rd side 9th side
K = -0.80000E + 02 K = -0.80000E + 02
A4 = 0.40098E-01 A3 = -0.18600E-01
A6 = -0.16496E-01 A4 = -0.14612E + 00
A8 = 0.77773E-02 A5 = -0.13597E-02
A10 = 0.25629E-02 A6 = 0.86655E-02
A12 = -0.75795E-03 A8 = 0.65943E-02
A14 = -0.19036E-02 A10 = -0.98825E-03
A12 = -0.14005E-02
A14 = 0.15273E-02

4th page 10th page
K = -0.80000E + 02 K = -0.80000E + 02
A4 = -0.17633E-01 A3 = -0.52035E-01
A6 = 0.42447E-01 A4 = 0.56611E-01
A8 = -0.85652E-02 A5 = -0.46635E-01
A10 = 0.25604E-03 A6 = -0.14548E-02
A12 = 0.25906E-02 A8 = -0.32705E-04
A14 = -0.42292E-02 A10 = -0.81689E-03
A12 = -0.56922E-04
A14 = -0.81130E-04

5th surface 11th surface
K = -0.68329E + 01 K = -0.94646E + 01
A3 = -0.39263E-01 A3 = -0.52721E-01
A4 = 0.54266E-01 A4 = -0.18143E-01
A5 = -0.23027E-01 A5 = 0.90387E-02
A6 = 0.47011E-01 A6 = 0.38540E-02
A8 = 0.22065E-01 A8 = -0.24205E-03
A10 = -0.14406E-01 A10 = -0.34012E-03
A12 = 0.32416E-03 A12 = -0.69904E-04
A14 = 0.77267E-02 A14 = 0.18100E-04

6th page 12th page
K = 0.59835E + 02 K = -0.16325E + 01
A3 = -0.15608E-01 A3 = -0.17429E + 00
A4 = 0.15523E-01 A4 = 0.27513E-01
A5 = -0.78098E-01 A5 = 0.15941E-01
A6 = 0.87948E-02 A6 = 0.61049E-02
A8 = 0.16705E-01 A8 = -0.24183E-03
A10 = -0.93955E-02 A10 = -0.12498E-03
A12 = -0.99252E-02 A12 = -0.11756E-04
A14 = 0.56624E-02 A14 = 0.27433E-05

7th 13th
K = 0.51010E + 02 K = -0.44413E + 02
A3 = -0.19386E-01 A3 = -0.60792E-01
A4 = -0.44788E-01 A4 = -0.72772E-02
A5 = 0.11236E-01 A5 = 0.54928E-02
A6 = -0.34916E-01 A6 = 0.73145E-05
A8 = -0.44265E-02 A8 = -0.21514E-03
A10 = 0.12574E-01 A10 = -0.31667E-04
A12 = -0.68618E-02 A12 = -0.21883E-05
A14 = 0.12846E-05

Single lens data

Lens Start surface Focal length (mm)
1 2 3.107
2 4 -5.054
3 6 9.051
4 8 -14.037
5 10 2.955
6 12 -2.539

  FIG. 13 is a sectional view of the lens of Example 5. In the figure, a first lens L1 having a positive refractive power and a convex surface facing the object side in the vicinity of the optical axis and having a curvature that is stronger on the object side surface than on the image side surface, a second lens L2 having a negative refractive power, A third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a positive refractive power, and having a negative refractive power and a concave surface facing the image side in the vicinity of the optical axis The sixth lens L6. The F number is 1.65. The aperture stop S is disposed closer to the object side than the effective diameter of the object side surface of the first lens L1. 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), and meridional coma aberration (d)).

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

[Table 6]
Example 6

f = 3.35mm fB = 0.15mm F = 1.65 2Y = 5.842mm
ENTP = 0mm EXTP = -2.15mm H1 = -1.5mm H2 = -3.19mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.29 1.01
2 * 1.564 0.54 1.54470 56.2 1.02
3 * 614.792 0.07 0.96
4 * 14.534 0.15 1.63470 23.9 0.97
5 * 2.684 0.40 0.96
6 * 9.735 0.41 1.54470 56.2 1.04
7 * -1760.042 0.22 1.14
8 * 108.143 0.20 1.63470 23.9 1.15
9 * 4.956 0.18 1.32
10 * 3.614 0.55 1.54470 56.2 1.55
11 * -1.541 0.55 1.74
12 * -1.475 0.32 1.54470 56.2 2.28
13 * 4.313 0.40 2.50
14 ∞ 0.11 1.51630 64.1 3.00
15 ∞ 3.00

Aspheric coefficient

2nd side 8th side
K = 0.72556E-01 K = 0.0
A4 = 0.20791E-02 A4 = -0.15333E + 00
A6 = 0.14812E-02 A6 = -0.36951E-01
A8 = -0.58685E-02 A8 = -0.10701E-02
A10 = 0.75920E-02 A10 = -0.10418E-01
A12 = 0.43861E-02 A12 = -0.24241E-02
A14 = -0.69080E-02

3rd side 9th side
K = 0.80000E + 02 K = -0.80000E + 02
A4 = 0.24666E-01 A3 = -0.12490E-01
A6 = -0.10702E-02 A4 = -0.15608E + 00
A8 = 0.10499E-01 A5 = -0.87260E-03
A10 = -0.81495E-02 A6 = -0.15361E-01
A12 = -0.74559E-02 A8 = -0.59767E-02
A14 = 0.67307E-03 A10 = 0.49169E-02
A12 = 0.12483E-02
A14 = 0.22352E-02

4th page 10th page
K = 0.70686E + 02 K = -0.26021E + 01
A4 = -0.12214E-01 A3 = -0.10207E + 00
A6 = 0.76860E-01 A4 = 0.76215E-01
A8 = -0.36811E-01 A5 = -0.10697E + 00
A10 = -0.12594E-01 A6 = -0.29348E-02
A12 = 0.12139E-01 A8 = 0.13840E-01
A14 = -0.65375E-02 A10 = -0.35227E-02
A12 = -0.12829E-02
A14 = 0.75823E-03

5th surface 11th surface
K = -0.76731E + 01 K = -0.27950E + 01
A3 = -0.21213E-01 A3 = 0.17218E-02
A4 = 0.75427E-01 A4 = -0.23019E-01
A5 = -0.44615E-03 A5 = 0.69989E-02
A6 = 0.25218E-01 A6 = 0.75162E-02
A8 = 0.14536E-01 A8 = -0.37553E-02
A10 = 0.10164E-01 A10 = 0.96280E-03
A12 = -0.13167E-01 A12 = 0.35804E-03
A14 = 0.14364E-01 A14 = -0.15223E-03

6th page 12th page
K = 0.74589E + 02 K = -0.15267E + 01
A3 = -0.11933E-01 A3 = -0.66238E-01
A4 = -0.19120E-01 A4 = 0.25139E-01
A5 = -0.95967E-01 A5 = 0.11447E-01
A6 = 0.26231E-02 A6 = 0.46424E-02
A8 = 0.29553E-01 A8 = -0.42441E-03
A10 = -0.17823E-01 A10 = -0.13279E-03
A12 = -0.21758E-01 A12 = -0.38106E-05
A14 = 0.17542E-01 A14 = 0.23595E-05

7th 13th
K = 0.0 K = -0.80000E + 02
A4 = -0.47416E-01 A3 = -0.50311E-01
A6 = -0.86362E-01 A4 = 0.10229E-01
A8 = -0.29910E-02 A5 = 0.24123E-02
A10 = 0.26459E-01 A6 = -0.19398E-02
A12 = -0.26301E-01 A8 = -0.58071E-03
A10 = 0.36271E-04
A12 = 0.31198E-05
A14 = 0.41258E-06

Single lens data

Lens Start surface Focal length (mm)
1 2 2.877
2 4 -5.213
3 6 17.776
4 8 -8.189
5 10 2.061
6 12 -1.979

  FIG. 15 is a sectional view of the lens of Example 6. In the figure, a first lens L1 having a positive refractive power and a convex surface facing the object side in the vicinity of the optical axis and having a curvature that is stronger on the object side surface than on the image side surface, a second lens L2 having a negative refractive power, A third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a positive refractive power, and having a negative refractive power and a concave surface facing the image side in the vicinity of the optical axis The sixth lens L6. The F number is 1.65. The aperture stop S is disposed closer to the object side than the effective diameter of the object side surface of the first lens L1. 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), and meridional coma aberration (d)).

  Table 7 shows values of the respective examples corresponding to the respective conditional expressions.

  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.

  Hereinafter, preferable embodiments will be described together.

In the imaging lens, it is preferable that the following conditional expression is satisfied.
1.00 <f1234 / f <2.00 (3)
However,
f1234: Composite focal length from the first lens to the fourth lens (mm)
f: Focal length (mm) of the entire imaging lens system

Conditional expression (3) is a conditional expression for appropriately setting the combined focal length from the first lens to the fourth lens. If the value of the conditional expression (3) exceeds the lower limit, the combined focal length of the fourth lens from the first lens does not become too short, and the first lens whose power tends to increase among the first lens to the fourth lens. And various aberrations occurring in the second lens can be suppressed. On the other hand, when the value of conditional expression (3) is below the upper limit, the combined power from the first lens to the fourth lens can be maintained moderately, and the overall length of the imaging lens can be shortened. More preferably, the range of the following formula is good.
1.20 <f1234 / f <1.90 (3) ′

Moreover, it is preferable that the following conditional expressions are satisfied.
−1.70 <f2 / f <−1.00 (4)
However,
f2: Focal length (mm) of the second lens
f: Focal length (mm) of the entire imaging lens system

Conditional expression (4) is a conditional expression for appropriately setting the focal length of the second lens. When the value of the upper limit expression (4) is less than the upper limit, the negative refractive power of the second lens does not become unnecessarily strong, and the coma and distortion at the peripheral portion can be reduced. On the other hand, when the value of the upper limit expression (4) exceeds the lower limit, the negative refractive power of the second lens can be maintained appropriately, which is effective in reducing Petzval sum and correcting field curvature. More preferably, the range of the following formula is good.
−1.60 <f2 / f <−1.20 (4) ′

Moreover, it is preferable that the following conditional expressions are satisfied.
1.50 <f3 / f <6.00 (5)
However,
f3: Focal length (mm) of the third lens
f: Focal length (mm) of the entire imaging lens system

Conditional expression (5) is a conditional expression for appropriately setting the focal length of the third lens. When the value of conditional expression (5) 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 (5) 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.
2.00 <f3 / f <5.50 (5) ′

Moreover, it is preferable that the following conditional expressions are satisfied.
0.30 <r1 / f <0.60 (6)
However,
r1: radius of curvature of the side surface of the first lens object (mm)
f: Focal length (mm) of the entire imaging lens system

Conditional expression (6) is a conditional expression for appropriately setting the curvature radius of the side surface of the first lens object to appropriately shorten the imaging lens and to correct the aberration. When the value of conditional expression (6) is below the upper limit, the refractive power of the side surface of the first lens object 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 (6) 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.
0.35 <r1 / f <0.50 (6) ′

Moreover, it is preferable that the following conditional expressions are satisfied.
0.40 <r4 / f <0.90 (7)
However,
r4: radius of curvature of side surface of second lens image (mm)
f: Focal length (mm) of the entire imaging lens system

Conditional expression (7) is a condition for appropriately setting the curvature radius 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 (7), the axial chromatic aberration generated by the first lens having positive refractive power is corrected well by the second lens. be able to. Further, when the value of conditional expression (7) 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 conditional expression (7) is below the upper limit, chromatic aberration can be corrected well while keeping the Petzval sum small. More preferably, the range of the following formula is good.
0.45 <r4 / f <0.85 (7) ′

Moreover, it is preferable that the following conditional expressions are satisfied.
0.02 <THIL2 / f <0.20 (8)
However,
THIL2: thickness on the optical axis of the second lens (mm)
f: Focal length (mm) of the entire imaging lens system

Conditional expression (8) is a conditional expression for appropriately setting the thickness of the second lens on the optical axis. When the value of conditional expression (8) 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, if the value of conditional expression (8) is less than the upper limit, the thickness of the second lens does not become too thick, and it becomes 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.
0.03 <THIL2 / f ≦ 0.15 (8) ′

Moreover, it is preferable that the following conditional expressions are satisfied.
0.10 <THIL6 / f <0.30 (9)
However,
THIL6: thickness of the sixth lens on the optical axis (mm)
f: Focal length (mm) of the entire imaging lens system

Conditional expression (9) is a conditional expression for appropriately setting the thickness of the sixth lens on the optical axis. When the value of conditional expression (9) 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 (9) 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.
0.15 <THIL6 / f <0.25 (9) '

Moreover, it is preferable that the following conditional expressions are satisfied.
2.0 <HENL6 <5.0 (10)
However,
HENL6: Deviation ratio of the sixth lens

Conditional expression (10) is a conditional expression for appropriately setting the deviation ratio of the sixth lens. The thickness deviation ratio here means a value obtained by dividing the lens thickness seen in the direction parallel to the optical axis at the periphery of the sixth lens by the center thickness on the optical axis. When the value of conditional expression (10) is below the upper limit, the uneven thickness ratio does not become excessively large, and the moldability can be prevented from being impaired. This is because in a lens that tends to have a large thickness ratio such as the sixth lens, when the thickness ratio increases, defects such as welds are likely to occur. On the other hand, when the value of conditional expression (10) exceeds the lower limit, the thickness ratio can be appropriately set, the aberration correction in the vicinity can be made good, and good telecentric characteristics can be secured. Become. More preferably, the range of the following formula is good.
3.0 <HENL6 <4.5 (10) '

The fourth lens preferably has negative refractive power and satisfies the following conditional expression.
20 <ν3-ν4 <70 (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. When the value of conditional expression (11) exceeds the lower limit, chromatic aberrations such as axial chromatic aberration and lateral chromatic aberration can be corrected with good balance. On the other hand, when the value of conditional expression (11) is below the upper limit, it can be made of an easily obtainable glass material. More preferably, the range of the following formula is good.
25 <ν3-ν4 <65 (11) ′

Moreover, it is preferable that the following conditional expressions are satisfied.
20 <ν1-ν2 <70 (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.
25 <ν1-ν2 <65 (12) ′

  Moreover, it is preferable that the object side surface of the sixth lens has an aspherical shape and has an extreme value at a position other than the intersection with the optical axis. 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.

  In addition, it is preferable that the image side surface of the second lens is monotonously inclined toward the image side as the distance from the optical axis increases. When a lens having a relatively large refractive power such as the second lens has a shape having an extreme value at a position other than the intersection with the optical axis, the performance deterioration when the second lens is decentered due to a manufacturing error. Tend to grow. Therefore, by making the image side surface of the second lens tilt monotonously toward the image side as it moves away from the optical axis, it is possible to suppress performance deterioration when a manufacturing error occurs. Note that “monotonously falls” means that the curved surface has no extreme value.

  In addition, it is preferable that the third lens has a shape that falls toward the object side at the peripheral portion. By forming the third lens in a shape that tilts toward the object side at the periphery, the shape of the periphery of the third lens can be made close to the concentric shape with respect to the aperture stop, and the axis generated by the third lens Various external aberrations can be suppressed.

  Moreover, you may have a lens which does not have refractive power substantially. That is, even when a dummy lens having substantially no power is added to the configuration of the imaging lens of the present invention, it is within the scope of the present invention.

  The present invention is not limited to the embodiments and examples described in the specification, and other embodiments, examples, and modifications are included in the embodiments and examples described in the present specification. It will be apparent to those skilled in the art from the technical idea.

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

DESCRIPTION OF SYMBOLS 10 Imaging lens 50 Imaging unit 51 Imaging element 51a Photoelectric conversion part 52 Board | substrate 53 Lens barrel 53a Flange part 54 Optical filter 55 Actuator 55a Carrier 55b Coil 55c Magnet 55d Yoke 56 Circuit board 57 Base member 57a Side wall part 57b Upper wall part 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 Parallel flat plates L1 to L6 Lens S Aperture stop

Claims (15)

An imaging lens for forming a subject image on a photoelectric conversion unit of a solid-state imaging device,
A first lens having a brightness of F2.4 or more, having a positive refractive power in order from the object side, a convex surface facing the object side in the vicinity of the optical axis, and a curvature that is stronger on the object side than on the image side A second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens, a fifth lens, and a sixth lens having a negative refractive power and having a concave surface facing the image side in the vicinity of the optical axis Consists of
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 aperture stop is disposed closer to the object side than the side surface of the second lens image;
An imaging lens satisfying the following conditional expression:
40.0 <ν3 <65.0 (1)
0.073 <d8 / f <0.15 (2)
2.00 <f3 / f <5.50 (5) ′
0.45 <r4 / f <0.85 (7) ′
However,
ν3: Abbe number of the third lens d8: Air interval on the optical axis of the fourth lens and the fifth lens (mm)
f: Focal length (mm) of the entire imaging lens system
f3: Focal length (mm) of the third lens
r4: radius of curvature of side surface of second lens image (mm) The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
1.00 <f1234 / f <2.00 (3)
However,
f1234: Composite focal length from the first lens to the fourth lens (mm)
f: Focal length (mm) of the entire imaging lens system The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
−1.70 <f2 / f <−1.00 (4)
However,
f2: Focal length (mm) of the second lens
f: Focal length (mm) of the entire imaging lens system The imaging lens according to any one of claims 1 to 3, characterized by satisfying the following conditional expression.
0.30 <r1 / f <0.60 (6)
However,
r1: radius of curvature of the side surface of the first lens object (mm)
f: Focal length (mm) of the entire imaging lens system The imaging lens according to any one of claims 1 to 4, characterized by satisfying the following conditional expression.
0.02 <THIL2 / f <0.20 (8)
However,
THIL2: thickness on the optical axis of the second lens (mm)
f: Focal length (mm) of the entire imaging lens system The imaging lens according to any one of claims 1 to 5, characterized by satisfying the following conditional expression.
0.10 <THIL6 / f <0.30 (9)
However,
THIL6: thickness of the sixth lens on the optical axis (mm)
f: Focal length (mm) of the entire imaging lens system The imaging lens according to any one of claims 1 to 6, characterized by satisfying the following conditional expression.
2.0 <HENL6 <5.0 (10)
However,
HENL6: Deviation ratio of the sixth lens The fourth lens has a negative refractive power, the imaging lens according to any one of claims 1 to 7, characterized by satisfying the following conditional expression.
20 <ν3-ν4 <70 (11)
However,
ν3: Abbe number of the third lens ν4: Abbe number of the fourth lens The imaging lens according to any one of claims 1 to 8 , wherein the following conditional expression is satisfied.
20 <ν1-ν2 <70 (12)
However,
ν1: Abbe number of the first lens ν2: Abbe number of the second lens The object side surface of the sixth lens is aspherical, imaging lens according to any one of claims 1 to 9, characterized in that it has an extreme value at a position other than the intersection with the optical axis. The image side surface of the second lens The imaging lens according to any one of claims 1 to 10, characterized in that has a shape monotonically fall to the image side farther from the optical axis. The imaging lens according to any one of claims 1 to 11 , wherein the third lens is shaped to fall toward the object side at a peripheral portion. The imaging lens according to any one of claims 1 to 12, characterized in that it has a substantially lens having no refractive power. Imaging apparatus characterized by having an imaging lens according to item 1 to claim 1-13. A portable terminal comprising the imaging device according to claim 14 .

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