JP2015225102A - Image capturing lens, image capturing device, and portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image capturing lens which has a reduced height and a small F-number and offers good imaging performance by effectively suppressing ghost and flare, and to provide an image capturing device and portable terminal having the same.SOLUTION: An image capturing lens comprises five or more lenses including a first lens L1 having positive refractive power and a second lens L2 having negative refractive power in order from the object side, and at least one of an image-side surface of the first lens L1 and an object-side and image side surfaces of the second lens L2 has a light-shielding film SM formed on an area outside an effective diameter thereof. Entry of unwanted light from an aperture end face section of the image capturing lens can thus be avoided without having to provide a shielding member somewhere close to the object side.

Description

  The present invention relates to a small imaging lens for forming a subject image detected by a solid-state imaging device, an imaging apparatus including the imaging lens, and a portable terminal.

  In recent years, along with the improvement in performance and size of solid-state imaging devices such as CCD (Charge Coupled Device) type image sensors or CMOS (Complementary Metal Oxide Semiconductor) type image sensors, mobile phones equipped with imaging devices and Portable information terminals are widespread. In addition, there is an increasing demand for further reduction in height and performance of imaging lenses mounted on these imaging apparatuses.

  Here, in order to improve the imaging performance of the imaging lens in response to a demand for higher performance, it is common to increase the number of lenses. However, when an imaging lens is formed using a plurality of lenses, light incident on each lens is internally reflected in the lens and becomes unnecessary light (unnecessary light) that does not contribute to image formation. May cause ghosts and flares. As a technique for suppressing such unnecessary light and cutting ghosts and flares, for example, as shown in Patent Documents 1 and 2, an annular light shielding plate is arranged outside the effective area of each lens, When assembling each lens, a light-shielding plate is interposed between the lenses.

JP 2010-32902 A JP 2011-242504 A

  By the way, since the increase in the number of lenses is contrary to the reduction in height, the lens interval is cut off to eliminate this, and the thickness of the light shielding member such as a diaphragm tends to be thinned. There is a thickness, and an annular surface (inner peripheral surface) having a small thickness is always present in the opening of the light shielding member. The annular surface is difficult to be subjected to surface treatment, and burrs and the like tend to remain in press working. Therefore, when light enters the annular surface, it becomes a secondary light source, and unnecessary light may be generated to cause ghost and flare. In particular, when the photographing lens is reduced in height, the distance between the annular surface and the imaging surface is shortened, so that the reflected light from the annular surface is likely to enter the imaging surface, and the tendency for the above-described ghost and flare to occur is significant. In addition, there is a demand for an increase in the diameter of the lens in relation to higher performance. However, if the F-number of the photographing lens is reduced accordingly, the effective diameter of the lens increases, and accordingly, the diameter of the annular surface of the light shielding member also increases. Since it becomes large, the risk of increasing the above-mentioned ghost and flare increases.

  The present invention has been made in view of such problems, and achieves good imaging performance by effectively suppressing ghosts and flares while having a low profile and a small F number. An object of the present invention is to obtain a photographing lens, an imaging device including the photographing lens, and a portable terminal.

The imaging lens according to claim 1,
An imaging lens for forming a subject image on a photoelectric conversion unit of a solid-state imaging device,
It is composed of five or more lenses arranged in order from the object side, including a first lens having a positive refractive power and a second lens having a negative refractive power,
A light shielding film is formed outside the effective diameter of at least one of the image side surface of the first lens, the object side surface and the image side surface of the second lens;
The following conditional expression is satisfied.
0.01 <D12 / Y <0.028 (1)
However,
D12: Distance on the optical axis between the first lens and the second lens Y: half of the 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)

  According to the present invention, a photographic lens with good imaging performance can be realized by using five or more lenses. Further, in order from the object side, the first lens having a positive refractive power and the second lens having a negative refractive power can be used to move the principal point to the object side, resulting in a low-profile photographing lens. be able to.

  Conditional expression (1) defines a condition for obtaining good imaging performance even when the photographing lens is low in profile and the F-number is reduced. More specifically, when the value of conditional expression (1) exceeds the lower limit, the first lens and the second lens can be configured not to interfere with each other. On the other hand, when the value of conditional expression (1) is less than the upper limit, a low-profile photographing lens can be realized, and a light beam bent in the optical axis direction by a first lens having a positive refractive power can be converted into a negative refractive power. Can be made incident on the second lens so that the height of the light beam does not become too low. Therefore, even if the F-number is made small, an optical system in which spherical aberration is corrected well can be obtained.

  Furthermore, if a light-shielding film is formed outside the effective diameter of at least one of the image side surface of the first lens, the object side surface and the image side surface of the second lens, ghosts and flares can be effectively suppressed. Since it is not necessary to provide a light shielding member at a position close to the object side in the back imaging lens, it is possible to avoid a problem that unnecessary light is generated from the opening end surface portion. As described above, it is possible to configure an imaging lens with good imaging performance that hardly generates unnecessary light even if it has a small F number.

The imaging lens described in claim 2 is characterized in that, in the invention described in claim 1, the following conditional expression is satisfied.
1.1 <f / f1 <1.4 (2)
However,
f1: Focal length of the first lens f: Focal length of the entire imaging lens system

  Conditional expression (2) defines a condition for realizing a photographing lens having a low profile and good imaging performance. More specifically, when the value of the conditional expression (2) exceeds the lower limit, the positive refractive power of the first lens becomes strong, and together with the second lens having negative refractive power arranged on the image side, Since a telephoto type with a relatively short overall length will be constructed, it is possible to achieve a construction in which the aberration generated in the first lens is suppressed as much as possible while maintaining a suitable telephoto property, and thus a low profile and good results. An imaging lens with image performance can be obtained. On the other hand, when the value of conditional expression (2) is less than the upper limit, the first lens can be configured not to have an excessively large refractive power, and even when the F-number is decreased, the occurrence of spherical aberration is suppressed. An imaging lens with good imaging performance can be obtained.

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.
−0.6> (r1 + r2) / (r1−r2)> − 1 (3)
However,
r1: radius of curvature of the side surface of the first lens object r2: radius of curvature of the side surface of the first lens image

  Conditional expression (3) defines a so-called shaping factor value in order to obtain conditions for preventing performance deterioration due to the occurrence of spherical aberration while reducing the F number with a low profile. More specifically, by setting the object-side radius of curvature r1 and the image-side radius of curvature r2 of the first lens to a range that satisfies the range of the conditional expression (3), the F number can be reduced with a low profile. An imaging lens having good imaging performance with reduced spherical aberration can be configured.

The imaging lens of Claim 4 satisfies the following conditional expressions in the invention of any one of Claims 1-3.
1.4 <Fno <2.2 (4)
However,
r1: radius of curvature of the side surface of the first lens object f: focal length of the entire imaging lens system

  Conditional expression (4) defines a preferred F-number region that is most effective in the present invention. More specifically, when the value of the conditional expression (4) exceeds the lower limit, it is possible to realize a photographing lens that is particularly corrected for coma. On the other hand, when the value of conditional expression (4) is less than the upper limit, it is possible to realize a photographic lens with high optical performance and a small F number.

  An imaging apparatus according to a fifth aspect includes the imaging lens according to any one of the first to fourth aspects and a solid-state imaging element.

  A portable terminal according to a sixth aspect includes the imaging device according to the fifth aspect.

  According to the present invention, a photographic lens that achieves good imaging performance by effectively cutting ghosts and flares while having a low F number and a small F number, and an imaging apparatus including the same A portable terminal can be obtained.

It is a perspective view of the imaging device 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 apparatus 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 device 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 ((a) spherical aberration, (b) astigmatism, (c) distortion). 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 ((a) spherical aberration, (b) astigmatism, (c) distortion). 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 ((a) spherical aberration, (b) astigmatism, (c) distortion).

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

  As shown in FIGS. 1 and 2, the imaging device 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 capture a subject image. A substrate 52 that holds the image sensor 51 and transmits / receives an electric signal thereof, and a housing 53 as a lens barrel that has an opening for light incidence from the object side and is made of a light shielding member. It is integrally formed.

  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. A 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 (not shown). 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 CMOS image sensor described above, and other devices such as a CCD may be used.

  The substrate 52 supports the image sensor 51 and the housing 53 on the upper surface thereof. Although not shown, the substrate 52 has a large number of signal transmission pads, and is connected to the image sensor 51 via wiring (not shown).

  In FIG. 2, a substrate 52 is connected to an external circuit (for example, a control circuit included in a host device on which the imaging device is mounted), and receives a voltage or a clock signal for driving the imaging device 51 from the external circuit. In addition, the digital YUV signal can be output to an external circuit.

  In FIG. 2, the housing 53 is fixedly disposed on the surface of the substrate 52 on which the image sensor 51 is provided so as to cover the image sensor 51. That is, the housing 53 is widely opened so that one end portion on the image sensor 51 side surrounds the image sensor 51, and an object side wall 53 a having a small opening is formed on the other end portion. One end portion on the element 51 side is fixed in contact.

  The imaging lens 10 disposed in the housing 53 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in order from the object side. In the present embodiment, the effective diameter outside the image side surface of the first lens L1, the effective outside diameter of the image side surface and the object side surface of the second lens L2, the outside effective diameter of the image side surface and the object side surface of the third lens L3, A light shielding film SM such as black ink is formed outside the effective diameter of the image side surface and the object side surface of the lens L4 and outside the effective diameter of the image side surface and the object side surface of the fifth lens L5. The light shielding film SM may be provided only outside the effective diameter of the image side surface of the first lens L1, and outside the effective diameter of the image side surface and the object side surface of the second lens L2, and other light shielding members may be provided.

  Spacers SP are arranged between the flange portions of the lenses L1 to L5, and respectively define the distance between the axes. Spacers SP are also arranged between the flange portion of the fifth lens L5 and the IR cut filter F and between the IR cut filter F and the substrate 52, respectively. In addition, the structure which a flange part contact | abuts instead of arrange | positioning a spacer between flange parts may be sufficient.

  The operation of the imaging device 50 described above will be described. FIG. 3 is a diagram illustrating a state in which the imaging device 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 device 50, for example, the object-side end surface of the housing 53 is provided on the back surface (see FIG. 3B) of the smartphone 100 and is disposed at a position corresponding to the back side of the touch panel 70.

  The imaging device 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 device 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 can touch the icon 71 displayed on the touch panel (display unit) 70 to operate the imaging device 50 to perform imaging. The image signal input from the imaging device 50 is subjected to image processing to be described later in the control unit 101, stored in the storage unit 91 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 system F: F number 2Y: Diagonal length of the imaging surface of the solid-state imaging device R: Radius of curvature D: Axial distance Nd: Refractive index with respect to d-line of lens material νd: With respect to d-line of lens material Abbe number

  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

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). Moreover, the value regarding the length is mm unless otherwise indicated.

[Table 1]
Example 1

f = 3.62mm fB = 0.28mm F = 1.84 2Y = 5.84mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * 1.690 0.670 1.54470 56.2 0.99
2 * (Aperture) -17.129 0.050 0.92
3 * 7.652 0.170 1.63470 23.9 0.90
4 * 2.146 0.423 0.93
5 * 9.575 0.535 1.54470 56.2 1.11
6 * ∞ 0.460 1.24
7 * 17.437 0.745 1.54470 56.2 1.41
8 * -1.380 0.300 1.70
9 * -4.526 0.342 1.54470 56.2 2.25
10 * 1.244 0.450 2.51
11 ∞ 0.110 1.51630 64.1 3.30
12 ∞ 3.30

Aspheric coefficient

1st side 6th side
K = -0.16099E + 01 K = 0.00000E + 00
A4 = 0.42509E-01 A4 = -0.94188E-01
A6 = -0.24907E-01 A6 = 0.52351E-03
A8 = 0.96714E-01 A8 = -0.32026E-01
A10 = -0.20014E + 00 A10 = 0.65498E-01
A12 = 0.18931E + 00 A12 = -0.60565E-01
A14 = -0.76314E-01 A14 = 0.22566E-01

2nd surface 7th surface
K = -0.50000E + 02 K = 0.50000E + 02
A4 = -0.80097E-01 A3 = -0.42649E-01
A6 = 0.34510E + 00 A4 = 0.48067E-01
A8 = -0.59251E + 00 A5 = -0.10040E + 00
A10 = 0.43589E + 00 A6 = 0.14611E-01
A12 = -0.13901E + 00 A8 = 0.10093E-01
A10 = -0.10196E-01
A12 = 0.10353E-02

3rd surface 8th surface
K = 0.38417E + 02 K = -0.76240E + 01
A4 = -0.25522E + 00 A3 = -0.11300E + 00
A6 = 0.79024E + 00 A4 = 0.10455E-01
A8 = -0.12284E + 01 A5 = 0.32856E-02
A10 = 0.94293E + 00 A6 = 0.30690E-02
A12 = -0.30120E + 00 A8 = 0.37157E-03
A10 = -0.20447E-02
A12 = 0.12798E-02
A14 = -0.22925E-03

4th side 9th side
K = -0.14022E + 02 K = 0.79050E + 00
A4 = -0.19126E-01 A3 = -0.24413E + 00
A6 = 0.34238E + 00 A4 = 0.46216E-01
A8 = -0.52334E + 00 A5 = 0.35437E-01
A10 = 0.44676E + 00 A6 = 0.29272E-02
A12 = -0.15009E + 00 A8 = -0.13992E-02
A10 = -0.10781E-03
A12 = 0.75523E-05
A14 = 1.83536E-06

5th surface 10th surface
K = 0.21484E + 02 K = -0.85142E + 01
A4 = -0.87540E-01 A3 = -0.15196E + 00
A6 = -0.97850E-01 A4 = 0.74618E-01
A8 = 0.36161E + 00 A5 = -0.15556E-01
A10 = -0.57724E + 00 A6 = 0.28003E-03
A12 = 0.44668E + 00 A8 = -0.30821E-03
A14 = -0.12141E + 00 A10 = -0.44514E-05
A12 = 0.34227E-05
A14 = 0.17208E-06

Single lens data

Lens Start surface Focal length (mm)
1 1 2.860
2 3 -4.755
3 5 17.578
4 7 2.380
5 9 -1.755

  FIG. 5 is a cross-sectional view of the imaging lens of the first embodiment relating to five balls. In the figure, L1 is a first lens having a positive refractive power, L2 is a second lens having a negative refractive power, L3 is a third lens, L4 is a fourth lens, L5 is a fifth lens, and I is an imaging surface. Show. 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. In Example 1, the light shielding film SM is formed outside the effective diameter on the image side surface of the first lens L1, and this also serves as an aperture stop. Note that the light shielding film SM may be formed outside the effective diameter of other surfaces.

  FIG. 6 is an aberration diagram of Example 1 ((a) spherical aberration, (b) astigmatism, (c) distortion). Here, in the spherical aberration diagram, the dotted line represents the amount of spherical aberration with respect to the g line, and the solid line represents the amount of spherical aberration with respect to the d line. In the astigmatism diagram, the solid line S represents the sagittal plane, and the dotted line M represents the meridional plane (the same applies hereinafter).

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

[Table 2]
Example 2

f = 4.44mm fB = 0.16mm F = 1.65 2Y = 7.13mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 (Aperture) ∞ -0.510 1.35
2 * 1.985 0.698 1.54470 56.2 1.35
3 * -28.306 0.066 1.30
4 * 5.535 0.170 1.63470 23.9 1.29
5 * 2.179 0.591 1.25
6 * 12.123 0.485 1.54470 56.2 1.34
7 * 59.674 0.353 1.45
8 * 3.545 0.250 1.63470 23.9 1.50
9 * 3.189 0.420 1.71
10 * 4.584 0.511 1.54470 56.2 2.04
11 * -4.271 0.785 2.33
12 * -2.734 0.301 1.54470 56.2 2.91
13 * 3.221 0.400 3.06
14 ∞ 0.110 1.51630 64.1 3.80
15 ∞ 0.140 3.80

Aspheric coefficient

2nd side 8th side
K = 0.46695E-01 K = -0.18113E + 02
A4 = 0.12422E-02 A3 = -0.43511E-01
A6 = 0.11930E-02 A4 = -0.83238E-01
A8 = -0.12018E-02 A5 = 0.27975E-01
A10 = 0.26112E-03 A6 = 0.61222E-02
A12 = 0.15251E-03 A8 = -0.74125E-02
A14 = -0.24298E-04 A10 = -0.15754E-02
A12 = -0.30853E-03

3rd side 9th side
K = 0.79642E + 02 K = -0.19818E + 02
A4 = 0.30231E-01 A3 = -0.35095E-01
A6 = -0.11095E-01 A4 = -0.85873E-01
A8 = 0.25488E-02 A5 = 0.17000E-01
A10 = 0.39247E-04 A6 = 0.69687E-02
A12 = 0.12816E-03 A8 = -0.17639E-03
A14 = -0.87590E-04 A10 = -0.16414E-02
A12 = -0.58437E-03
A14 = 0.34133E-03

4th page 10th page
K = -0.80000E + 02 K = -0.53282E + 02
A4 = -0.93774E-02 A3 = -0.79511E-02
A6 = 0.23810E-01 A4 = 0.34286E-01
A8 = -0.90361E-02 A5 = -0.30286E-01
A10 = 0.39037E-03 A6 = -0.14277E-01
A12 = 0.13688E-02 A8 = 0.55789E-02
A14 = -0.49469E-03 A10 = -0.10757E-02
A12 = -0.35738E-04
A14 = 0.30390E-04

5th surface 11th surface
K = -0.11597E + 02 K = 0.22110E + 01
A3 = -0.56129E-02 A3 = -0.18319E-01
A4 = 0.53502E-01 A4 = 0.50525E-01
A5 = -0.21581E-01 A5 = -0.18844E-01
A6 = 0.13387E-01 A6 = -0.54627E-02
A8 = 0.51476E-02 A8 = -0.50653E-04
A10 = -0.17849E-03 A10 = 0.27587E-03
A12 = -0.12450E-02 A12 = 0.48707E-04
A14 = 0.90913E-03 A14 = -0.10212E-04

6th page 12th page
K = 0.15750E + 02 K = -0.34852E + 01
A3 = -0.28358E-01 A3 = -0.15768E + 00
A4 = 0.28055E-01 A4 = 0.19739E-01
A5 = -0.48514E-01 A5 = 0.12310E-01
A6 = 0.15722E-02 A6 = 0.34547E-02
A8 = 0.82537E-02 A8 = -0.28030E-03
A10 = -0.11432E-02 A10 = -0.56024E-04
A12 = -0.33624E-02 A12 = 0.40916E-05
A14 = 0.12936E-02 A14 = 0.11161E-07

7th 13th
K = -0.80000E + 02 K = -0.80000E + 02
A3 = -0.19689E-01 A3 = -0.61547E-01
A4 = -0.46325E-01 A4 = 0.51438E-02
A5 = 0.26192E-01 A5 = 0.21366E-02
A6 = -0.13062E-01 A6 = 0.37555E-03
A8 = -0.12384E-01 A8 = -0.11651E-03
A10 = 0.63474E-02 A10 = -0.11217E-04
A12 = -0.17594E-02 A12 = -0.15337E-05
A14 = 0.00000E + 00 A14 = 0.27034E-06

Single lens data

Lens Start surface Focal length (mm)
1 2 3.418
2 4 -5.721
3 6 27.713
4 8 -68.197
5 10 4.126
6 12 -2.656

  FIG. 7 is a cross-sectional view of the image pickup lens of Example 2 according to six balls. In the figure, L1 is a first lens having a positive refractive power, L2 is a second lens having a negative refractive power, L3 is a third lens, L4 is a fourth lens, L5 is a fifth lens, and L6 is a sixth lens. , S represents an aperture stop, and I represents 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. In Example 2, the light shielding film SM is formed outside the effective diameter of the object side surface of the second lens L2. Note that the light shielding film SM may be formed outside the effective diameter of other surfaces.

  FIG. 8 is an aberration diagram of Example 2 ((a) spherical aberration, (b) astigmatism, (c) distortion).

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

[Table 3]
Example 3

f = 4.58mm fB = 0.50mm F = 1.43 2Y = 7.13mm

Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * 2.313 0.868 1.54470 56.2 1.63
2 * -12.457 0.067 1.55
3 * 2.580 0.184 1.63470 23.9 1.40
4 * (Aperture) 1.427 0.751 1.25
5 * 26.864 0.364 1.54470 56.2 1.38
6 * 8.071 0.117 1.52
7 * 2.893 0.399 1.54470 56.0 1.73
8 * 5.297 0.229 1.83
9 * 10.394 0.204 1.63470 23.9 1.99
10 * 6.266 0.318 2.07
11 * 9.890 0.725 1.54470 56.2 2.31
12 * -1.519 0.416 2.46
13 * -36.524 0.250 1.54470 56.2 3.03
14 * 1.363 0.500 3.23
15 ∞ 0.110 1.51630 64.1 3.66
16 ∞ 3.66

Aspheric coefficient

1st side 8th side
K = -0.78337E + 00 K = 0.49516E + 01
A4 = 0.10998E-01 A3 = -0.48630E-01
A6 = 0.19935E-02 A4 = -0.30422E-01
A8 = -0.14476E-02 A5 = 0.21664E-01
A10 = 0.14749E-02 A6 = -0.48162E-01
A12 = -0.52582E-03 A8 = 0.14394E-01
A14 = 0.78514E-04 A10 = -0.21473E-02
A12 = 0.15433E-03

2nd side 9th side
K = -0.80000E + 02 K = 0.19384E + 02
A4 = 0.54387E-01 A3 = -0.34426E-01
A6 = -0.44045E-01 A4 = -0.18491E + 00
A8 = 0.29272E-01 A5 = 0.16448E + 00
A10 = -0.13246E-01 A6 = -0.99215E-01
A12 = 0.34036E-02 A8 = 0.25258E-01
A14 = -0.36430E-03 A10 = -0.32168E-02
A12 = 0.10308E-03

3rd surface 10th surface
K = -0.23424E + 02 K = -0.79582E + 01
A4 = 0.10166E-01 A3 = -0.23532E-01
A6 = -0.14596E-01 A4 = -0.14625E + 00
A8 = 0.13597E-01 A5 = 0.72069E-01
A10 = -0.83321E-02 A6 = -0.17988E-01
A12 = 0.25503E-02 A8 = 0.15502E-02
A14 = -0.26968E-03 A10 = 0.10814E-02
A12 = -0.24776E-03
A14 = 0.11398E-04

4th side 11th side
K = -0.64921E + 01 K = -0.81499E + 01
A3 = 0.89946E-02 A3 = -0.46126E-02
A4 = 0.84109E-02 A4 = 0.74692E-02
A5 = 0.96314E-02 A5 = -0.54544E-01
A6 = 0.17804E-01 A6 = 0.43213E-01
A8 = -0.32888E-01 A8 = -0.11945E-01
A10 = 0.28671E-01 A10 = 0.24908E-02
A12 = -0.12852E-01 A12 = -0.30035E-03
A14 = 0.24952E-02 A14 = 0.16797E-04

5th surface 12th surface
K = -0.80000E + 02 K = -0.88275E + 01
A3 = -0.64562E-02 A3 = -0.60231E-01
A4 = 0.88079E-02 A4 = -0.34674E-01
A5 = -0.89401E-01 A5 = 0.45711E-01
A6 = 0.84792E-01 A6 = -0.25881E-02
A8 = -0.51032E-01 A8 = -0.44273E-02
A10 = 0.22436E-01 A10 = 0.10881E-02
A12 = -0.57837E-02 A12 = -0.12577E-03
A14 = 0.15816E-04 A14 = 0.58623E-05

6th 13th
K = 0.57353E + 01 K = -0.79994E + 02
A3 = -0.29335E-01 A3 = -0.81773E-01
A4 = -0.94702E-01 A4 = -0.50454E-01
A5 = 0.19638E-02 A5 = 0.17788E-01
A6 = 0.22892E-01 A6 = 0.83819E-02
A8 = -0.10919E-01 A8 = -0.73839E-03
A10 = 0.96943E-03 A10 = -0.57709E-04
A12 = 0.70527E-03 A12 = 0.95122E-05
A14 = -0.32699E-03 A14 = -0.33298E-06

7th 14th
K = 0.44923E + 00 K = -0.77301E + 01
A3 = -0.50475E-01 A3 = -0.51413E-02
A4 = -0.83920E-01 A4 = -0.82827E-01
A5 = 0.37601E-02 A5 = 0.50438E-01
A6 = -0.47136E-02 A6 = -0.10817E-01
A8 = 0.11743E-02 A8 = 0.33488E-03
A10 = 0.12272E-02 A10 = -0.38934E-04
A12 = 0.14471E-03 A12 = 0.29516E-05
A14 = -0.11564E-03 A14 = -0.57045E-07

Single lens data

Lens Start surface Focal length (mm)
1 1 3.642
2 3 -5.310
3 5 -21.238
4 7 11.008
5 9 -25.101
6 11 2.462
7 13 -2.396

  FIG. 9 is a cross-sectional view of the image pickup lens of Example 3 according to seven balls. In the figure, L1 is a first lens having a positive refractive power, L2 is a second lens having a negative refractive power, L3 is a third lens, L4 is a fourth lens, L5 is a fifth lens, and L6 is a sixth lens. , L7 denotes a seventh lens, and I denotes 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. In Example 3, the light shielding film SM is formed outside the effective diameter of the image side surface of the second lens L2, and this also serves as an aperture stop. Note that the light shielding film SM may be formed outside the effective diameter of other surfaces.

  FIG. 10 is an aberration diagram of Example 3 ((a) spherical aberration, (b) astigmatism, (c) distortion).

  Table 4 shows values of the respective examples corresponding to the respective conditional expressions.

DESCRIPTION OF SYMBOLS 10 Image pick-up lens 50 Image pick-up device 51 Image pick-up element 51a Photoelectric conversion part 52 Substrate 53 Lens barrel 60 Input part 70 Touch panel 80 Wireless communication part 91 Memory | storage part 92 Temporary memory | storage part 100 Smartphone 101 Control part L1-L7 Lens SM Light shielding film

Claims (6)

An imaging lens for forming a subject image on a photoelectric conversion unit of a solid-state imaging device,
It is composed of five or more lenses arranged in order from the object side, including a first lens having a positive refractive power and a second lens having a negative refractive power,
A light shielding film is formed outside the effective diameter of at least one of the image side surface of the first lens, the object side surface and the image side surface of the second lens;
An imaging lens satisfying the following conditional expression:
0.01 <D12 / Y <0.028 (1)
However,
D12: Distance on the optical axis between the first lens and the second lens Y: half of the 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) The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
1.1 <f / f1 <1.4 (2)
However,
f1: Focal length of the first lens f: Focal length of the entire imaging lens system The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
−0.6> (r1 + r2) / (r1−r2)> − 1 (3)
However,
r1: radius of curvature of the side surface of the first lens object r2: radius of curvature of the side surface of the first lens image The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
1.4 <Fno <2.2 (4)
However,
r1: radius of curvature of the first lens object side surface f: focal length of the entire imaging lens   An imaging apparatus comprising the imaging lens according to claim 1 and a solid-state imaging device.   A portable terminal comprising the imaging device according to claim 5.

Images