JPWO2013145989A1 - Imaging lens, imaging device, and portable terminal - Google Patents

Abstract

A wide-angle, bright lens with an angle of view of 65? Or more and an F number of 3 or less, and a three-lens imaging lens with various aberrations corrected while having lower error sensitivity and better moldability than the conventional type, and its use An imaging apparatus and a portable terminal are provided. The imaging lens includes a first lens, an aperture stop, a second lens, and a third lens in order from the object side. The first lens is a positive lens having a convex object side surface, and the second lens is a positive meniscus having a concave object surface. The third lens is a negative lens whose image side surface is concave near the optical axis, has an inflection point within the effective diameter, and is a convex aspheric surface around the lens, and satisfies the following conditional expression: To do. −5.0 <r3 / f <−0.4 (1) 0.0 <f1 / f2 <5.0 (2) where r3: radius of curvature of the side surface of the second lens object ( mm) f: focal length of the entire system (mm) f1: focal length of the first lens (mm) f2: focal length of the second lens (mm)

Description

  The present invention relates to an imaging lens suitable for an imaging device using a solid-state imaging device such as a CCD (Charge Coupled Device) type image sensor or a CMOS (Complementary Metal Oxide Semiconductor) type image sensor, an imaging device using the imaging lens, and a portable terminal. It is about.

  In recent years, with the improvement in performance and miniaturization of imaging devices using solid-state imaging devices such as CCD (Charge Coupled Device) type image sensors or CMOS (Complementary Metal Oxide Semiconductor) type image sensors, Portable information terminals are becoming popular. In addition, there is an increasing demand for further downsizing and higher performance of imaging lenses mounted on these imaging apparatuses. Recently, there are many cases where such a portable terminal is equipped with a high-pixel, high-performance main camera and a low-pixel, small-sized sub camera.

  As an imaging lens for main camera applications, an imaging lens having a configuration of three to five lenses has been proposed because high performance is required. On the other hand, as a sub-camera, the number of pixels of the VGA class has been common so far, and the image pickup lens having one or two lenses has been mainly used. As the number of sub-cameras increases to 2M class, the required performance of imaging devices is also increasing. For this reason, an imaging lens having a three-lens configuration that can achieve higher performance than one or two-lens configurations has been proposed. However, since the number of elements in the three-lens configuration is larger than that in the two-lens configuration, the performance deterioration due to the accumulation of the respective manufacturing errors is significant. difficult. For this reason, the optical design of the three-lens imaging lens requires a low error sensitivity and an excellent design from the viewpoint of productivity. Here, as imaging lenses having a three-lens configuration, imaging lenses having a positive / negative configuration as in Patent Documents 1 and 2 are known.

JP 2004-326097 A JP 2007-322561 A

  However, in the imaging lens described in Patent Document 1, since the curvature of the object side surface of the second lens is too strong, large one-sided blur occurs when the optical surface is decentered from the optical axis. Therefore, it is necessary to manage the eccentricity generated between the optical axes of the first lens and the second lens with high accuracy, and there is a concern about productivity. Similarly, in the imaging lens described in Patent Document 2, since the curvature of the object side surface of the second lens is too strong, the axial coma generated when the optical surface is decentered from the optical axis is large, which increases productivity. There are concerns. Furthermore, with the techniques disclosed in both Patent Document 1 and Patent Document 2, when an imaging lens having a maximum image height of 2 mm or less is used, there is a concern that the lens thickness becomes too thin and lens molding becomes difficult.

  The present invention has been made in view of such problems, and in a wide-angle and bright lens having an angle of view of 65 ° or more and an F number of 3 or less, the error sensitivity is lower than the conventional type and the moldability is good. An object of the present invention is to provide a three-lens imaging lens in which various aberrations are corrected, an imaging device using the imaging 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.
TTL / 2Y <1.10 (14)

Here, the image-side focus 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.
TTL / 2Y <1.00 (14) '

The imaging lens according to claim 1, wherein the angle of view of the maximum image height is 65 ° or more and the F number is 3.0 or less.
It consists of the first lens, aperture stop, second lens, and third lens in order from the object side.
The first lens is a positive lens having a convex object side surface,
The second lens is a positive meniscus lens having a concave object surface,
The third lens is a negative lens whose image side surface is a concave surface near the optical axis, has an inflection point within the effective diameter, and is an aspheric surface that is a convex surface around the lens,
An imaging lens satisfying the following conditional expression:
−5.0 <r3 / f <−0.4 (1)
0.0 <f1 / f2 <5.0 (2)
However,
r3: radius of curvature (mm) of the side surface of the second lens object
f: Focal length of the entire system (mm)
f1: Focal length (mm) of the first lens
f2: Focal length (mm) of the second lens

  By placing a positive lens (a lens with positive power) facing the object side as the first lens on the most object side, the principal point can be moved closer to the object side, reducing the total lens length. I can do it. In addition, since the aperture stop is disposed between the first lens and the second lens, the first lens and the second lens can have a configuration close to symmetry with the aperture stop interposed therebetween. This is advantageous for aberration correction.

  In addition, by arranging a meniscus lens having a concave surface facing the object side as the second lens, it is possible to reduce a light incident angle on the object side surface and the image side surface of the second lens, thereby suppressing the occurrence of aberrations. it can. Furthermore, by making the second lens a positive lens, it is possible to share the positive power that tends to be biased to the first lens when the total length is shortened with the second lens, and to improve aberration correction even when the angle is widened. I can do it.

  Further, by arranging a negative lens (lens having negative power) having a concave surface near the optical axis on the image side as the third lens, it is possible to secure a certain degree of back focus, and at the same time have an inflection point and a peripheral portion. By making the convex aspherical surface, the telecentric characteristics of the peripheral rays can be improved.

  An image pickup lens having a wide angle of 65 ° or more and a brightness of F3 or less and a small optical total length is a three-lens lens with an aperture stop between the first lens and the second lens. If it is going to be achieved by the configuration, a stronger positive power is required on the object side, and the optical surface of each lens needs to have a larger radius of curvature from the viewpoint of reducing error sensitivity. Accordingly, when the first lens and the second lens are regarded as one lens group, the group needs to have a strong positive power, and the positive power is the above-mentioned in terms of aberration correction and error sensitivity reduction. It is desirable to share the first lens and the second lens. Conditional expression (2) is a conditional expression of the power ratio between the first lens and the second lens. When the power of the first lens is so strong that the value of conditional expression (2) is lower than the lower limit, There is a concern that the decentering error sensitivity of one lens becomes very high, and the productivity deteriorates. Further, when the power of the second lens is so strong that the value of the conditional expression (2) exceeds the upper limit, the decentration error sensitivity of the second lens is also increased, and the productivity may be deteriorated. There is. Therefore, by satisfying conditional expression (2), it is possible to improve the performance as a wide-angle and bright lens while suppressing the eccentric error sensitivity of the first lens and the second lens.

  Conditional expression (1) is a conditional expression that regulates the ratio of the curvature radius of the object side surface of the second lens to the focal length of the entire system, and the curvature radius decreases as the value of conditional expression (1) falls below the lower limit. In the case of a small lens, particularly in a bright lens of F3 or less, the height of the light beam is higher than that of a dark lens, and the light beam is incident on the periphery of the lens having a larger angle of the lens surface. If the radius of curvature is so large that the value of conditional expression (1) exceeds the upper limit, the incident angle of the light ray on the surface becomes large, and it becomes difficult to suppress the occurrence of aberrations such as coma. Therefore, by satisfying conditional expression (1), it is possible to obtain a lens with good aberration correction while reducing decentration error sensitivity.

The imaging lens described in claim 2 is characterized in that, in the invention described in claim 1, the following conditional expression is satisfied.
-1.0 <(r5 + r6) / (r5-r6) <2.5 (3)
However,
r5: radius of curvature (mm) of the side surface of the third lens object
r6: radius of curvature (mm) of the side surface of the third lens image

  Conditional expression (3) is a conditional expression that defines the shape of the third lens. When the value of conditional expression (3) exceeds the lower limit, the lens can be moved toward the object side with respect to the principal point position of the third lens, which is a negative lens, so that it is easy to ensure the back focus. Further, when the value of conditional expression (3) is below the upper limit, the third lens does not have a strong meniscus shape with the convex surface facing the object side, so that the back focus becomes too long and the total optical length is prevented from increasing. be able to.

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.
0.9 <f1 / f <1.2 (4)

  Conditional expression (4) is a conditional expression that defines the ratio of the power of the first lens to the power of the entire system. When the value of conditional expression (4) exceeds the lower limit, it is possible to prevent the occurrence of higher-order aberrations and the increase in decentering error sensitivity due to the power of the first lens being too strong. Also, if the value of conditional expression (4) is less than the upper limit, the positive power of the first lens close to the object side becomes stronger, and the principal point position of the entire system is closer to the object side, so that the total optical length can be shortened. become.

The imaging lens of Claim 4 satisfies the following conditional expressions in the invention of any one of Claims 1-3.
0.7 <Ds / Y <1.2 (5)
However,
Ds: Distance from the aperture stop to the image plane (mm)
Y: Maximum image height (mm)

  Conditional expression (5) is a conditional expression that defines the ratio of the distance from the aperture stop to the image plane and the maximum image height. When the value of conditional expression (5) exceeds the lower limit, the aperture stop is moved away from the image plane with respect to the maximum image height, and the exit pupil position is moved toward the object side, so that telecentricity can be improved. In addition, when the value of conditional expression (5) is less than the upper limit, it is possible to prevent the aperture stop from being too far from the image plane and to prevent the total optical length from increasing.

The imaging lens of Claim 5 satisfies the following conditional expressions in the invention in any one of Claims 1-4, It is characterized by the above-mentioned.
0.15 <d1 / TTL <0.3 (6)
However,
d1: Core thickness of the first lens (mm)
TTL: Total length of the imaging lens (the flat plate is converted to air) (mm)

Conditional expression (6) is a conditional expression that defines the ratio between the total optical length and the axial thickness of the first lens.
When the value of conditional expression (6) exceeds the lower limit, the thickness of the first lens can be sufficiently secured, which is advantageous for moldability. Moreover, when the value of conditional expression (6) is less than the upper limit, it is possible to prevent the first lens from becoming too thick and shortening the optical total length.

The imaging lens of Claim 6 satisfies the following conditional expressions in the invention in any one of Claims 1-5, It is characterized by the above-mentioned.
−2.0 <(r1 + r2) / (r1−r2) <− 0.6 (7)
However,
r1: curvature radius (mm) of the side surface of the first lens object
r2: radius of curvature (mm) of the side surface of the first lens image

  Conditional expression (7) is a conditional expression that defines the shape of the first lens. When the value of conditional expression (7) exceeds the lower limit, it is possible to suppress the occurrence of coma and the like due to the curvature radii of the object side surface and the image side surface of the first lens becoming too small. Moreover, since the principal point position of the first lens is closer to the object side when the value of conditional expression (7) is less than the upper limit, the optical total length can be shortened.

The imaging lens of Claim 7 satisfies the following conditional expressions in the invention in any one of Claims 1-6, It is characterized by the above-mentioned.
−2.0 <r3 / f <−0.4 (8)

  Conditional expression (8) is a more desirable range of the ratio of the object-side radius of curvature of the second lens to the focal length of the entire system. By satisfying this conditional expression, the balance between decentration error sensitivity and aberration correction is improved. can do.

An imaging lens according to an eighth aspect of the invention according to any one of the first to seventh aspects satisfies the following conditional expression.
0.7 <f1 / f2 <2.3 (9)

  Conditional expression (9) is a more desirable range of the focal length ratio of the first lens and the second lens. By satisfying this conditional expression, the power ratio of the first lens and the second lens becomes more appropriate, and the The core error sensitivity can be reduced.

An imaging lens according to a ninth aspect is characterized in that, in the invention according to any one of the first to eighth aspects, the following conditional expression is satisfied.
0.1 <(r5 + r6) / (r5-r6) <2.0 (10)

  Conditional expression (10) is a more desirable range of the third lens shape. By satisfying this conditional expression, the total optical length can be reduced while maintaining the back focus more appropriately.

The imaging lens of Claim 10 satisfies the following conditional expressions in the invention in any one of Claims 1-9.
45 <v3 <70 (11)
v3: Abbe number of the third lens

  Conditional expression (11) is a conditional expression that defines the Abbe number of the third lens. When the value of conditional expression (11) exceeds the lower limit, the occurrence of lateral chromatic aberration due to the third lens peripheral portion can be suppressed. Moreover, it becomes advantageous for correction | amendment of a longitudinal chromatic aberration because the value of conditional expression (11) is less than an upper limit.

The imaging lens of Claim 11 satisfies the following conditional expressions in the invention of any one of Claims 1-10.
TTL / f <1.5 (12)

  Conditional expression (12) is a conditional expression that defines the ratio of the total optical length to the focal length. By satisfying this conditional expression, an imaging lens having a good balance between the angle of view and the total optical length and a small total optical length can be obtained.

An imaging lens according to a twelfth aspect of the invention according to any one of the first to eleventh aspects satisfies the following conditional expression.
D / TTL> 1.5 (13)
However,
D: Entrance pupil diameter (mm)

  Conditional expression (13) is a conditional expression that defines the ratio of the entrance pupil diameter to the total optical length. When the value of conditional expression (13) exceeds the lower limit, an appropriate amount of light can be secured, and the total length can be shortened while maintaining a clear image with little noise. On the other hand, when the value of conditional expression (13) is less than the upper limit, it is not necessary to make the entrance pupil diameter too large and various aberrations can be corrected easily.

  An imaging lens according to a thirteenth aspect is characterized in that, in the invention according to any one of the first to twelfth aspects, the lens has substantially no power. That is, even when a dummy lens having substantially no power is added to the configuration of claim 1, it is within the scope of application of the present invention.

  The imaging device of Claim 14 is provided with the imaging lens in any one of Claims 1-13.

  According to a fifteenth aspect of the present invention, there is provided a mobile terminal including the imaging device according to the fourteenth aspect.

  According to the present invention, in a wide-angle and bright lens having an angle of view of 65 ° or more and an F-number of 3 or less, an image with a three-lens structure in which various aberrations are corrected while error sensitivity is lower than a conventional type and moldability is good A lens, an imaging device using the lens, and a portable terminal can be provided.

It is a perspective view of imaging device LU concerning this embodiment. It is sectional drawing which cut | disconnected the structure of FIG. 1 by the arrow II-II line | wire, and looked at the arrow direction. 1 is a diagram showing a mobile phone T. FIG. 1 is a cross-sectional view of an imaging lens according to Example 1. FIG. FIG. 6 is an aberration diagram of spherical aberration (a), astigmatism (b), distortion (c), and meridional coma (d) of the imaging lens according to Example 1; 6 is a cross-sectional view of an imaging lens according to Example 2. FIG. FIG. 6 is an aberration diagram of spherical aberration (a), astigmatism (b), distortion (c), and meridional coma (d) of the imaging lens according to Example 2; 6 is a cross-sectional view of an imaging lens according to Example 3. FIG. FIG. 6 is an aberration diagram of spherical aberration (a), astigmatism (b), distortion (c), and meridional coma (d) of the imaging lens according to Example 3; 6 is a cross-sectional view of an imaging lens according to Example 4. FIG. FIG. 10 is an aberration diagram of spherical aberration (a), astigmatism (b), distortion (c), and meridional coma (d) of the imaging lens according to Example 4; 6 is a cross-sectional view of an imaging lens according to Example 5. FIG. FIG. 10 is an aberration diagram of spherical aberration (a), astigmatism (b), distortion (c), and meridional coma (d) of the imaging lens according to Example 5; 6 is a cross-sectional view of an imaging lens according to Example 6. FIG. FIG. 10 is an aberration diagram of spherical aberration (a), astigmatism (b), distortion (c), and meridional coma (d) of the imaging lens according to Example 6; 10 is a cross-sectional view of an imaging lens according to Example 7. FIG. FIG. 10 is an aberration diagram of spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d) of the imaging lens according to Example 7; 10 is a cross-sectional view of an imaging lens according to Example 8. FIG. FIG. 10 is an aberration diagram of spherical aberration (a), astigmatism (b), distortion (c), and meridional coma (d) of the imaging lens according to Example 8; 10 is a cross-sectional view of an imaging lens according to Example 9. FIG. FIG. 10 is an aberration diagram of spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d) of the imaging lens according to Example 9;

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an imaging apparatus LU according to the present embodiment, and FIG. 2 is a cross-sectional view of the configuration of FIG. 1 taken along line II-II and viewed in the direction of the arrow. As shown in FIG. 2, the imaging device LU is a CMOS type image sensor IM as a solid-state imaging device having a photoelectric conversion unit IMa, and imaging that causes the photoelectric conversion unit (light receiving surface) IMa of the image sensor IM to capture a subject image. A lens LN and an external connection terminal (electrode) (not shown) for transmitting and receiving the electrical signal are provided, and these are integrally formed.

  The imaging lens LN having an angle of view of the maximum image height of 65 ° or more and an F number of 3.0 or less, in order from the object side (upward in FIG. 2), first lens L1, aperture stop S, second lens L2, The first lens L1 is a positive lens having a convex object side surface, the second lens L2 is a positive meniscus lens having a concave object surface, and the third lens L3 has an image side surface near the optical axis. It is a negative lens that is concave and has an inflection point within the effective diameter and is an aspherical surface that is convex around the lens. The lens may be made of glass or plastic.

A spacer SP1 is disposed between the first lens L1 and the second lens L2, a spacer SP2 is disposed between the second lens L2 and the third lens L3, and the third lens L3, the IR cut filter F, A spacer SP3 is disposed between the two. The lenses L1 to L3 may be in contact with each other at the flange portions. The imaging lens LN satisfies the following expression.
−5.0 <r3 / f <−0.4 (1)
0.0 <f1 / f2 <5.0 (2)
However,
r3: second lens L2 radius of curvature of object side surface (mm)
f: Focal length of the entire system (mm)
f1: Focal length (mm) of the first lens L1
f2: Focal length (mm) of the second lens L2

  The imaging lens LN is fixed to the inner periphery of the housing BX. The lower end of the housing BX is in contact with the substrate ST that holds the image sensor IM.

  The image sensor IM has a photoelectric conversion unit IMa as a light receiving unit in which pixels (photoelectric conversion elements) are two-dimensionally arranged at the center of the plane on the light receiving side, and a signal processing circuit (not shown). It is connected to the. 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 near the outer edge of the light receiving side plane of the image sensor IM, and are connected to the image sensor IM via wires (not shown). The image sensor IM converts a signal charge from the photoelectric conversion unit IMa into an image signal such as a digital YUV signal and outputs the image signal to a predetermined circuit 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 solid-state imaging device is not limited to the CMOS image sensor, and other devices such as a CCD may be used.

  The image sensor IM is connected to an external circuit (for example, a control circuit included in a host device of a portable terminal mounted with an imaging device) via an external connection terminal, and a voltage or a clock for driving the image sensor IM from the external circuit. It is possible to receive a signal and to output a digital YUV signal to an external circuit.

  Next, a mobile phone as an example of a mobile terminal equipped with an imaging device will be described with reference to the external view of FIG. 3A is a view of the folded mobile phone opened from the inside and FIG. 3B is a view of the folded mobile phone opened from the outside.

  In FIG. 3, in the mobile phone T, an upper housing 71 as a case having display screens D <b> 1 and D <b> 2 and a lower housing 72 having operation buttons B are connected via a hinge 73. In the present embodiment, the main imaging device MC for photographing a landscape or the like is provided on the surface side of the upper housing 71, and the imaging device LU including the above-described wide-angle imaging lens LN is the upper housing 71. And provided on the display screen D1.

  As shown in FIG. 3A, the imaging lens LN can capture an image of the upper body of the user who holds the mobile phone T with his / her hand, with the imaging device LU facing the imaging device LU. By transmitting the image signal to the mobile phone of the other party that is communicating and displaying the image of this user, a so-called videophone can be realized by making a normal call. The mobile phone T is not limited to a folding type.

(Example)
Next, examples suitable for the above-described embodiment will be described. However, the present invention is not limited to the following examples. The meaning of each code | symbol in an Example is as follows (a unit of length is mm other than a wavelength).
FL: Focal length of the entire imaging lens system (mm)
BF: Back focus (mm) (however, distance to paraxial image plane including cover glass)
Fno: F number w: Half angle of view (°)
Ymax: half length (mm) of the diagonal length of the imaging surface of the solid-state imaging device
TL: Distance (mm) 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 (however, “image-side focal point” means that parallel rays parallel to the optical axis are incident on the imaging lens. This is the image point when
r: radius of curvature of refractive surface (mm)
d: Distance between shaft upper surfaces (mm)
nd: Refractive index of lens material at d-line at room temperature vd: Abbe number of lens material STO: Aperture stop

  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”.

However,
Ai: i-th order aspherical coefficient R: radius of curvature K: conic constant.

In the following (including the lens data in the table), a power of 10 (for example, 2.5 × 10 ⁻⁰² ) is represented using E or e (for example, 2.5e−002). The surface number of the lens data was given in order with the object side of the first lens as one surface. In addition, the unit of the numerical value showing the length as described in an Example shall be mm.

  Incidentally, 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). The approximate radius of curvature when the measured shape of the shape is fitted by the method of least squares can be regarded as the paraxial radius of curvature. 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 a paraxial curvature radius. (For example, see references 41 to 42 of Yoshiya Matsui's “Lens Design Method” (Kyoritsu Publishing Co., Ltd.) for reference)

Example 1
Table 1 shows lens data in Example 1. 4 is a sectional view of the lens of Example 1. FIG. The imaging lens according to the first exemplary embodiment includes, in order from the object side, a first lens L1, an aperture stop S, a second lens L2, and a third lens L3. The first lens L1 is a positive lens having a convex object side surface. The second lens L2 is a positive meniscus lens having a concave object surface, and the third lens L3 is an aspheric surface whose image side surface is concave near the optical axis, has an inflection point within the effective diameter, and is convex around the lens. It is a negative lens. CG is a parallel plate assuming a cover glass or an IR cut filter, and IM is an imaging surface of the solid-state imaging device.

[table 1]
[Example 1]

Reference Wave Length = 587.56 nm
unit: mm

Surface number rd nd vd eff.diameter
OBJ INFINITY 350.0000
1 * 1.0093 0.5970 1.58313 59.45 1.145
2 * -20.0000 0.0040 0.653
STO INFINITY 0.2370 0.603
4 * -0.8784 0.5110 1.58313 59.45 0.745
5 * -0.5667 0.0200 1.154
6 * -11.5146 0.4670 1.58313 59.45 1.438
7 * 1.0398 0.2000 1.976
8 INFINITY 0.1750 1.52550 54.49 2.320
IMG INFINITY 0.3186

Aspheric coefficient
1: K = -5.82823e-001, A4 = -1.44729e-002, A6 = 2.00267e-001, A8 = -3.32259e + 000, A10 = 9.67450e + 000, A12 = -1.62611e + 001
2: K = -5.00000e + 001, A4 = -6.11206e-001, A6 = 1.04561e + 000, A8 = -1.99733e + 001, A10 = 1.15283e + 002, A12 = -2.53793e + 002
4: K = -1.68073e + 000, A3 = -2.43603e-001, A4 = 2.23065e + 000, A5 = -1.48786e + 001, A6 = 5.30436e + 000, A7 = 0.00000e + 000, A8 = 3.24127 e + 002, A9 = 0.00000e + 000, A10 = -3.36409e + 003, A11 = 0.00000e + 000, A12 = 1.75099e + 004, A13 = 0.00000e + 000, A14 = -3.64514e + 004
5: K = -3.32755e + 000, A3 = 2.86194e-001, A4 = -5.05356e + 000, A5 = 6.14011e + 000, A6 = 3.30102e + 000, A7 = 0.00000e + 000, A8 = -1.12011 e + 001, A9 = 0.00000e + 000, A10 = -1.16984e + 000, A11 = 0.00000e + 000, A12 = 1.52798e + 002, A13 = 0.00000e + 000, A14 = -2.73122e + 002
6: K = 4.44836e + 001, A3 = 3.72034e-001, A4 = -5.49083e + 000, A5 = 7.71369e + 000, A6 = 1.16549e + 000, A7 = 0.00000e + 000, A8 = -9.45267e + 000, A9 = 0.00000e + 000, A10 = 8.58151e + 000, A11 = 0.00000e + 000, A12 = -3.13681e + 000, A13 = 0.00000e + 000, A14 = 1.43510e-001
7: K = -4.02482e-001, A3 = 4.50567e-001, A4 = -4.40852e + 000, A5 = 6.83922e + 000, A6 = -4.20748e + 000, A7 = 0.00000e + 000, A8 = 3.34901 e-001, A9 = 0.00000e + 000, A10 = 9.87298e-001, A11 = 0.00000e + 000, A12 = -9.55421e-001, A13 = 0.00000e + 000, A14 = 2.87654e-001

FL 1.810
Fno 2.42
w 70.85 °
Ymax 1.295
BF 0.627
TL 2.463

Elem Surfs Focal Length Diameter
1 1- 2 1.6651 1.145
2 4- 5 1.7077 1.154
3 6-7 -1.6134 1.976

  FIG. 5 is an aberration diagram of Example 1 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma (d)). Here, in the spherical aberration diagram and the meridional coma aberration diagram, the solid line represents the spherical aberration amount with respect to the d line and the dotted line, respectively, and in the astigmatism diagram, the solid line represents the sagittal surface and the dotted line represents the meridional surface ( same as below).

(Example 2)
Table 2 shows lens data in Example 2. 6 is a sectional view of the lens of Example 2. FIG. The imaging lens of Example 2 includes, in order from the object side, a first lens L1, an aperture stop S, a second lens L2, and a third lens L3. The first lens L1 is a positive lens having a convex object side surface. The second lens L2 is a positive meniscus lens having a concave object surface, and the third lens L3 is an aspheric surface whose image side surface is concave near the optical axis, has an inflection point within the effective diameter, and is convex around the lens. It is a negative lens. CG is a parallel plate assuming a cover glass or an IR cut filter, and IM is an imaging surface of the solid-state imaging device.

[Table 2]
[Example 2]

Reference Wave Length = 587.56 nm
unit: mm

Surface number rd nd vd eff.diameter
OBJ INFINITY 350.0000
1 * 1.0985 0.6980 1.58313 59.45 1.227
2 * -1e + 003 0.0170 0.590
STO INFINITY 0.2440 0.522
4 * -1.1544 0.5840 1.58313 59.45 0.744
5 * -0.6000 0.0910 1.199
6 * -8.1659 0.4500 1.58313 59.45 1.495
7 * 0.8781 0.2000 2.069
8 INFINITY 0.2100 1.52550 54.49 2.400
IMG INFINITY 0.2227

Aspheric coefficient
1: K = -1.06930e + 000, A3 = 0.00000e + 000, A4 = 4.18030e-002, A5 = 0.00000e + 000, A6 = 3.23990e-001, A7 = 0.00000e + 000, A8 = -2.45580e + 000, A9 = 0.00000e + 000, A10 = 6.03320e + 000, A12 = -6.75840e + 000
2: K = 3.00000e + 001, A3 = 0.00000e + 000, A4 = -5.35580e-001, A5 = 0.00000e + 000, A6 = 3.83290e + 000, A7 = 0.00000e + 000, A8 = -3.05320e + 001, A9 = 0.00000e + 000, A10 = 6.01560e + 001, A12 = -2.30730e + 002
4: K = -1.25250e + 001, A3 = -2.26050e-002, A4 = -1.59240e + 000, A5 = -2.60220e + 000, A6 = 5.52880e + 000, A7 = 0.00000e + 000, A8 = 1.20530e + 001, A9 = 0.00000e + 000, A10 = -1.81540e + 002, A11 = 0.00000e + 000, A12 = 4.07010e + 002, A13 = 0.00000e + 000, A14 = 2.84260e + 003
5: K = -6.54530e-001, A3 = 4.20450e-001, A4 = -3.55610e + 000, A5 = 7.49390e + 000, A6 = -4.10650e + 000, A7 = 0.00000e + 000, A8 =- 1.08340e + 001, A9 = 0.00000e + 000, A10 = 4.30770e + 001, A11 = 0.00000e + 000, A12 = -2.55210e + 001, A13 = 0.00000e + 000, A14 = -2.18560e + 001
6: K = -3.67010e + 000, A3 = 9.48110e-002, A4 = -3.54110e + 000, A5 = 4.15590e + 000, A6 = 9.59320e-001, A7 = 0.00000e + 000, A8 = -3.13200 e + 000, A9 = 0.00000e + 000, A10 = 2.47510e + 000, A11 = 0.00000e + 000, A12 = -2.32220e + 000, A13 = 0.00000e + 000, A14 = 1.23010e + 000
7: K = -5.20260e-001, A3 = -1.01150e-001, A4 = -2.47930e + 000, A5 = 3.61860e + 000, A6 = -1.84470e + 000, A7 = 0.00000e + 000, A8 = -2.18470e-001, A9 = 0.00000e + 000, A10 = 4.65450e-001, A11 = 0.00000e + 000, A12 = -1.94400e-001, A13 = 0.00000e + 000, A14 = 1.34670e-002

FL 1.892
Fno 2.80
w 69.05 °
Ymax 1.295
BF 0.550
TL 2.634

Elem Surfs Focal Length Diameter
1 1- 2 1.8822 1.227
2 4- 5 1.5436 1.199
3 6-7 -1.3352 2.069

  FIG. 7 is an aberration diagram of Example 2 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma (d)).

(Example 3)
Table 3 shows lens data in Example 3. FIG. 8 is a sectional view of the lens of Example 3. The imaging lens of Example 3 includes, in order from the object side, a first lens L1, an aperture stop S, a second lens L2, and a third lens L3. The first lens L1 is a positive lens having a convex object side surface. The second lens L2 is a positive meniscus lens having a concave object surface, and the third lens L3 is an aspheric surface whose image side surface is concave near the optical axis, has an inflection point within the effective diameter, and is convex around the lens. It is a negative lens. CG is a parallel plate assuming a cover glass or an IR cut filter, and IM is an imaging surface of the solid-state imaging device.

[Table 3]
[Example 3]

Reference Wave Length = 587.56 nm
unit: mm

Surface number rd nd vd eff.diameter
OBJ INFINITY 350.0000
1 * 0.7288 0.3106 1.54470 56.09 0.812
2 * 6.6420 0.0275 0.578
STO INFINITY 0.2228 0.487
4 * -0.5810 0.3071 1.54470 56.09 0.608
5 * -0.3170 0.0215 0.834
6 * 13.0982 0.2309 1.54470 56.09 1.100
7 * 0.5185 0.2025 1.380
8 INFINITY 0.2100 1.52310 54.49 1.680
IMG INFINITY 0.3064

Aspheric coefficient
1: K = -6.17489e-001, A3 = 0.00000e + 000, A4 = -5.77962e-002, A5 = 0.00000e + 000, A6 = 8.12359e-001, A7 = 0.00000e + 000, A8 = -3.27881 e + 001, A9 = 0.00000e + 000, A10 = 1.79113e + 002, A12 = -5.76174e + 002
2: K = 2.48970e + 000, A3 = 0.00000e + 000, A4 = -1.35183e + 000, A5 = 0.00000e + 000, A6 = 2.38687e + 001, A7 = 0.00000e + 000, A8 = -6.39337e + 002, A9 = 0.00000e + 000, A10 = 6.85188e + 003, A12 = -2.74431e + 004
4: K = -1.28548e + 001, A3 = -4.21232e-001, A4 = -6.46691e + 000, A5 = 3.35091e + 000, A6 = -4.06024e-001, A7 = 0.00000e + 000, A8 = 3.69681e + 002, A9 = 0.00000e + 000, A10 = -5.86088e + 003, A11 = 0.00000e + 000, A12 = 3.35323e + 004, A13 = 0.00000e + 000, A14 = 1.84507e + 004
5: K = -1.54745e + 000, A3 = 1.02137e + 000, A4 = -4.19467e + 000, A5 = 3.90191e + 000, A6 = -1.49072e + 000, A7 = 0.00000e + 000, A8 =- 2.71405e + 001, A9 = 0.00000e + 000, A10 = 3.15198e + 002, A11 = 0.00000e + 000, A12 = 6.14455e + 002, A13 = 0.00000e + 000, A14 = -2.26195e + 003
6: K = 1.99179e + 001, A3 = 5.62236e-001, A4 = -5.25251e + 000, A5 = 7.95696e + 000, A6 = -2.56313e-001, A7 = 0.00000e + 000, A8 = -1.22486 e + 001, A9 = 0.00000e + 000, A10 = 2.04422e + 001, A11 = 0.00000e + 000, A12 = -1.67662e + 001, A13 = 0.00000e + 000, A14 = 8.78548e + 000
7: K = -1.07787e + 000, A3 = -5.86961e-001, A4 = -6.90530e + 000, A5 = 1.78845e + 001, A6 = -1.58721e + 001, A7 = 0.00000e + 000, A8 = 4.07817e + 000, A9 = 0.00000e + 000, A10 = 4.74275e + 000, A11 = 0.00000e + 000, A12 = -8.44236e + 000, A13 = 0.00000e + 000, A14 = 3.86176e + 000

FL 1.361
Fno 2.40
w 70.74 °
Ymax 0.991
BF 0.641
TL 1.762

Elem Surfs Focal Length Diameter
1 1- 2 1.4755 0.831
2 4- 5 0.9083 0.856
3 6-7 -0.9977 1.534

  FIG. 9 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 in Example 4. FIG. 10 is a sectional view of the lens of Example 4. The imaging lens of Example 4 includes, in order from the object side, a first lens L1, an aperture stop S, a second lens L2, and a third lens L3. The first lens L1 is a positive lens having a convex object side surface. The second lens L2 is a positive meniscus lens having a concave object surface, and the third lens L3 is an aspheric surface whose image side surface is concave near the optical axis, has an inflection point within the effective diameter, and is convex around the lens. It is a negative lens. CG is a parallel plate assuming a cover glass or an IR cut filter, and IM is an imaging surface of the solid-state imaging device.

[Table 4]
[Example 4]

Reference Wave Length = 587.56 nm
unit: mm

Surface number rd nd vd eff.diameter
OBJ INFINITY 350.0000
1 * 0.7347 0.3064 1.54470 56.09 0.805
2 * 7.2122 0.0270 0.577
STO INFINITY 0.2423 0.490
4 * -0.5683 0.3031 1.54470 56.09 0.619
5 * -0.3145 0.0200 0.842
6 * 15.4076 0.2326 1.54470 56.09 1.120
7 * 0.5274 0.2070 1.390
8 INFINITY 0.2100 1.52310 54.49 1.710
IMG INFINITY 0.2957

Aspheric coefficient
1: K = -6.48596e-001, A3 = 0.00000e + 000, A4 = -6.70484e-002, A5 = 0.00000e + 000, A6 = 6.91345e-001, A7 = 0.00000e + 000, A8 = -3.28755 e + 001, A9 = 0.00000e + 000, A10 = 1.79314e + 002, A12 = -5.87418e + 002
2: K = -4.48170e + 001, A3 = 0.00000e + 000, A4 = -1.35668e + 000, A5 = 0.00000e + 000, A6 = 2.39714e + 001, A7 = 0.00000e + 000, A8 = -6.37816 e + 002, A9 = 0.00000e + 000, A10 = 6.84782e + 003, A12 = -2.77262e + 004
4: K = -1.23566e + 001, A3 = -4.63019e-001, A4 = -6.54866e + 000, A5 = 3.22694e + 000, A6 = -5.13701e-001, A7 = 0.00000e + 000, A8 = 3.71082e + 002, A9 = 0.00000e + 000, A10 = -5.99233e + 003, A11 = 0.00000e + 000, A12 = 3.29123e + 004, A13 = 0.00000e + 000, A14 = 2.34825e + 004
5: K = -1.51528e + 000, A3 = 1.03010e + 000, A4 = -4.25213e + 000, A5 = 3.79135e + 000, A6 = -1.68235e + 000, A7 = 0.00000e + 000, A8 =- 2.81556e + 001, A9 = 0.00000e + 000, A10 = 3.13827e + 002, A11 = 0.00000e + 000, A12 = 6.21489e + 002, A13 = 0.00000e + 000, A14 = -2.26185e + 003
6: K = -1.74664e + 000, A3 = 5.42485e-001, A4 = -5.25311e + 000, A5 = 7.96085e + 000, A6 = -2.47613e-001, A7 = 0.00000e + 000, A8 =- 1.22122e + 001, A9 = 0.00000e + 000, A10 = 2.04587e + 001, A11 = 0.00000e + 000, A12 = -1.68599e + 001, A13 = 0.00000e + 000, A14 = 8.83749e + 000
7: K = -1.09045e + 000, A3 = -5.96305e-001, A4 = -6.91120e + 000, A5 = 1.78923e + 001, A6 = -1.58751e + 001, A7 = 0.00000e + 000, A8 = 4.02198e + 000, A9 = 0.00000e + 000, A10 = 4.67516e + 000, A11 = 0.00000e + 000, A12 = -8.40741e + 000, A13 = 0.00000e + 000, A14 = 4.12776e + 000

FL 1.364
Fno 2.40
w 70.80 °
Ymax 0.991
BF 0.635
TL 1.766

Elem Surfs Focal Length Diameter
1 1- 2 1.4771 0.805
2 4- 5 0.9095 0.839
3 6- 7 -1.0081 1.383

  FIG. 11 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 in Example 5. 12 is a sectional view of the lens of Example 5. FIG. The imaging lens of Example 5 includes, in order from the object side, a first lens L1, an aperture stop S, a second lens L2, and a third lens L3. The first lens L1 is a positive lens having a convex object side surface. The second lens L2 is a positive meniscus lens having a concave object surface, and the third lens L3 is an aspheric surface whose image side surface is concave near the optical axis, has an inflection point within the effective diameter, and is convex around the lens. It is a negative lens. CG is a parallel plate assuming a cover glass or an IR cut filter, and IM is an imaging surface of the solid-state imaging device.

[Table 5]
[Example 5]

Reference Wave Length = 587.56 nm
unit: mm

Surface number rd nd vd eff.diameter
OBJ INFINITY 350.0000
1 * 0.7571 0.3980 1.54470 56.09 1.032
2 * 2.0960 0.0611 0.688
STO INFINITY 0.2630 0.582
4 * -0.9594 0.5409 1.54470 56.09 0.765
5 * -0.3998 0.0200 1.182
6 * 12.8895 0.2763 1.54470 56.09 1.557
7 * 0.5429 0.2000 1.897
8 INFINITY 0.2100 1.52310 54.49 2.156
IMG INFINITY 0.3881

Aspheric coefficient
1: K = -2.12223e-001, A3 = 0.00000e + 000, A4 = 9.44218e-002, A5 = 0.00000e + 000, A6 = 8.73824e-001, A7 = 0.00000e + 000, A8 = -5.89894e + 000, A9 = 0.00000e + 000, A10 = 2.87946e + 001, A12 = -4.35614e + 001
2: K = 4.74203e + 000, A3 = 0.00000e + 000, A4 = -3.48170e-001, A5 = 0.00000e + 000, A6 = 9.74272e + 000, A7 = 0.00000e + 000, A8 = -1.25263e + 002, A9 = 0.00000e + 000, A10 = 7.72957e + 002, A12 = -1.93360e + 003
4: K = -2.47267e + 001, A3 = -2.09631e-001, A4 = -2.91299e + 000, A5 = 1.60631e + 000, A6 = -3.92374e + 000, A7 = 0.00000e + 000, A8 = 7.03881e + 001, A9 = 0.00000e + 000, A10 = -7.45996e + 002, A11 = 0.00000e + 000, A12 = 2.90749e + 003, A13 = 0.00000e + 000, A14 = -4.18084e + 003
5: K = -1.47985e + 000, A3 = 7.35473e-001, A4 = -2.17357e + 000, A5 = 1.60764e + 000, A6 = 1.46526e-002, A7 = 0.00000e + 000, A8 = -7.41180 e + 000, A9 = 0.00000e + 000, A10 = 1.99449e + 001, A11 = 0.00000e + 000, A12 = -6.20567e + 000, A13 = 0.00000e + 000, A14 = 1.13730e + 001
6: K = -2.89526e + 001, A3 = 2.23174e-001, A4 = -2.76256e + 000, A5 = 3.36174e + 000, A6 = 8.78567e-002, A7 = 0.00000e + 000, A8 = -2.42147 e + 000, A9 = 0.00000e + 000, A10 = 2.61648e + 000, A11 = 0.00000e + 000, A12 = -1.99703e + 000, A13 = 0.00000e + 000, A14 = 7.70916e-001
7: K = -9.34713e-001, A3 = -6.61931e-001, A4 = -3.52027e + 000, A5 = 7.49593e + 000, A6 = -5.30455e + 000, A7 = 0.00000e + 000, A8 = 8.33485e-001, A9 = 0.00000e + 000, A10 = 6.73974e-001, A11 = 0.00000e + 000, A12 = -7.08918e-001, A13 = 0.00000e + 000, A14 = 2.00545e-001

FL 1.739
Fno 2.40
w 70.00 °
Ymax 1.238
BF 0.719
TL 2.278

Elem Surfs Focal Length Diameter
1 1- 2 1.9695 1.056
2 4- 5 0.9385 1.233
3 6-7 -1.0489 2.125

  FIG. 13 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 in Example 6. FIG. 14 is a sectional view of the lens of Example 6. The imaging lens of Example 6 includes, in order from the object side, a first lens L1, an aperture stop S, a second lens L2, and a third lens L3. The first lens L1 is a positive lens having a convex object side surface. The second lens L2 is a positive meniscus lens having a concave object surface, and the third lens L3 is an aspheric surface whose image side surface is concave near the optical axis, has an inflection point within the effective diameter, and is convex around the lens. It is a negative lens. CG is a parallel plate assuming a cover glass or an IR cut filter, and IM is an imaging surface of the solid-state imaging device.

[Table 6]
[Example 6]

Reference Wave Length = 587.56 nm
unit: mm

Surface number rd nd vd eff.diameter
OBJ INFINITY 350.0000
1 * 0.8169 0.3908 1.54470 56.09 1.053
2 * 2.3298 0.0646 0.700
STO INFINITY 0.3609 0.598
4 * -3.8305 0.6636 1.54470 56.09 0.962
5 * -0.4250 0.0200 1.344
6 * -5.8080 0.2500 1.54470 56.09 1.521
7 * 0.4375 0.2000 2.061
8 INFINITY 0.2100 1.52310 54.49 2.230
IMG INFINITY 0.1962

Aspheric coefficient
1: K = -1.52969e-001, A3 = 0.00000e + 000, A4 = 1.43038e-001, A5 = 0.00000e + 000, A6 = -8.48792e-001, A7 = 0.00000e + 000, A8 = 1.05741e + 001, A9 = 0.00000e + 000, A10 = -3.99881e + 001, A12 = 7.07314e + 001
2: K = 2.95142e + 001, A3 = 0.00000e + 000, A4 = -2.47685e-001, A5 = 0.00000e + 000, A6 = 6.98135e + 000, A7 = 0.00000e + 000, A8 = -1.18474e + 002, A9 = 0.00000e + 000, A10 = 8.97606e + 002, A12 = -2.69198e + 003
4: K = -5.00000e + 001, A3 = -2.29364e-001, A4 = 1.02674e + 000, A5 = -1.57055e + 000, A6 = -1.69722e + 001, A7 = 0.00000e + 000, A8 = 1.79103e + 002, A9 = 0.00000e + 000, A10 = -1.02883e + 003, A11 = 0.00000e + 000, A12 = 3.02000e + 003, A13 = 0.00000e + 000, A14 = -3.52347e + 003
5: K = -2.49539e + 000, A3 = 2.77022e-001, A4 = -2.23833e + 000, A5 = 1.81634e + 000, A6 = 9.89095e-001, A7 = 0.00000e + 000, A8 = -6.35618 e + 000, A9 = 0.00000e + 000, A10 = 1.50234e + 001, A11 = 0.00000e + 000, A12 = -1.32646e + 001, A13 = 0.00000e + 000, A14 = 7.54699e + 000
6: K = 4.11416e + 001, A3 = -2.66457e-001, A4 = -3.11989e + 000, A5 = 3.52584e + 000, A6 = 9.14555e-001, A7 = 0.00000e + 000, A8 = -1.03863 e + 000, A9 = 0.00000e + 000, A10 = 1.65374e + 000, A11 = 0.00000e + 000, A12 = -6.17614e + 000, A13 = 0.00000e + 000, A14 = 4.71489e + 000
7: K = -9.26775e-001, A3 = -1.14558e + 000, A4 = -3.35954e + 000, A5 = 7.68450e + 000, A6 = -5.35169e + 000, A7 = 0.00000e + 000, A8 = 6.43931e-001, A9 = 0.00000e + 000, A10 = 6.86433e-001, A11 = 0.00000e + 000, A12 = -5.54066e-001, A13 = 0.00000e + 000, A14 = 1.11887e-001

FL 1.750
Fno 2.40
w 69.86 °
Ymax 1.234
BF 0.528
TL 2.278

Elem Surfs Focal Length Diameter
1 1- 2 2.1166 1.053
2 4- 5 0.8213 1.344
3 6-7 -0.7365 2.061

  FIG. 15 is an aberration diagram of Example 6 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d)).

(Example 7)
Table 7 shows lens data in Example 7. FIG. 16 is a sectional view of the lens of Example 7. The imaging lens according to the seventh exemplary embodiment includes, in order from the object side, a first lens L1, an aperture stop S, a second lens L2, and a third lens L3. The first lens L1 is a positive lens having a convex object side surface. The second lens L2 is a positive meniscus lens having a concave object surface, and the third lens L3 is an aspheric surface whose image side surface is concave near the optical axis, has an inflection point within the effective diameter, and is convex around the lens. It is a negative lens. CG is a parallel plate assuming a cover glass or an IR cut filter, and IM is an imaging surface of the solid-state imaging device.

[Table 7]
[Example 7]

Reference Wave Length = 587.56 nm
unit: mm

Surface number rd nd vd eff.diameter
OBJ INFINITY 350.0000
1 * 0.8511 0.4013 1.54470 56.09 1.062
2 * 1.8506 0.0695 0.653
STO INFINITY 0.2888 0.541
4 * -2.9620 0.6475 1.54470 56.09 0.944
5 * -0.3405 0.0407 1.283
6 * -2.5368 0.2500 1.54470 56.09 1.582
7 * 0.4276 0.2000 2.033
8 INFINITY 0.2100 1.52310 54.49 2.164
IMG INFINITY 0.2480

Aspheric coefficient
1: K = -1.03776e-002, A3 = 0.00000e + 000, A4 = 1.87104e-001, A5 = 0.00000e + 000, A6 = -8.66986e-001, A7 = 0.00000e + 000, A8 = 1.17674e + 001, A9 = 0.00000e + 000, A10 = -4.34734e + 001, A12 = 8.25561e + 001
2: K = 1.50371e + 001, A3 = 0.00000e + 000, A4 = 7.66907e-002, A5 = 0.00000e + 000, A6 = 5.85416e + 000, A7 = 0.00000e + 000, A8 = -1.07585e + 002, A9 = 0.00000e + 000, A10 = 1.15749e + 003, A12 = -4.43924e + 003
4: K = 1.80188e + 001, A3 = -5.49035e-002, A4 = 3.24135e-001, A5 = 9.04907e-002, A6 = -1.76211e + 001, A7 = 0.00000e + 000, A8 = 1.74496e + 002, A9 = 0.00000e + 000, A10 = -1.01278e + 003, A11 = 0.00000e + 000, A12 = 3.15869e + 003, A13 = 0.00000e + 000, A14 = -3.77798e + 003
5: K = -1.71328e + 000, A3 = 1.27737e + 000, A4 = -3.36740e + 000, A5 = 1.12523e + 000, A6 = 1.65838e + 000, A7 = 0.00000e + 000, A8 = -5.27829 e + 000, A9 = 0.00000e + 000, A10 = 1.06616e + 001, A11 = 0.00000e + 000, A12 = -2.02010e + 001, A13 = 0.00000e + 000, A14 = 4.13132e + 001
6: K = 5.80943e + 000, A3 = 6.95597e-001, A4 = -3.52999e + 000, A5 = 2.90357e + 000, A6 = 6.12133e-001, A7 = 0.00000e + 000, A8 = -6.46441e -001, A9 = 0.00000e + 000, A10 = 2.52287e + 000, A11 = 0.00000e + 000, A12 = -5.53078e + 000, A13 = 0.00000e + 000, A14 = 3.11594e + 000
7: K = -9.66263e-001, A3 = -1.04302e + 000, A4 = -3.55231e + 000, A5 = 7.94015e + 000, A6 = -5.40543e + 000, A7 = 0.00000e + 000, A8 = 5.55505e-001, A9 = 0.00000e + 000, A10 = 7.41856e-001, A11 = 0.00000e + 000, A12 = -5.02395e-001, A13 = 0.00000e + 000, A14 = 8.29632e-002

FL 1.594
Fno 2.40
w 75.79 °
Ymax 1.234
BF 0.580
TL 2.278

Elem Surfs Focal Length Diameter
1 1- 2 2.5341 1.062
2 4- 5 0.6497 1.283
3 6- 7 -0.6523 2.033

  FIG. 17 is an aberration diagram of Example 7 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d)).

(Example 8)
Table 8 shows lens data in Example 8. FIG. 18 is a sectional view of the lens of Example 8. The imaging lens according to the eighth exemplary embodiment includes, in order from the object side, a first lens L1, an aperture stop S, a second lens L2, and a third lens L3. The first lens L1 is a positive lens having a convex object side surface. The second lens L2 is a positive meniscus lens having a concave object surface, and the third lens L3 is an aspheric surface whose image side surface is concave near the optical axis, has an inflection point within the effective diameter, and is convex around the lens. It is a negative lens. CG is a parallel plate assuming a cover glass or an IR cut filter, and IM is an imaging surface of the solid-state imaging device.

[Table 8]
[Example 8]

Reference Wave Length = 587.56 nm
unit: mm

Surface number rd nd vd eff.diameter
OBJ INFINITY 350.0000
1 * 0.7225 0.4326 1.54470 56.09 1.057
2 * 1.9854 0.0617 0.678
STO INFINITY 0.2504 0.566
4 * -0.9275 0.4278 1.54470 56.09 0.737
5 * -0.3231 0.0727 1.054
6 * -0.5307 0.3462 1.54470 56.09 1.374
7 * 3.0070 0.2052 1.834
8 INFINITY 0.2100 1.52310 54.49 2.144
IMG INFINITY 0.2834

Aspheric coefficient
1: K = -1.97626e-001, A3 = 0.00000e + 000, A4 = 8.88625e-002, A5 = 0.00000e + 000, A6 = 3.98172e-001, A7 = 0.00000e + 000, A8 = -8.83580e -001, A9 = 0.00000e + 000, A10 = 6.69554e + 000, A12 = -7.55857e + 000
2: K = 1.40660e + 000, A3 = 0.00000e + 000, A4 = -2.61728e-002, A5 = 0.00000e + 000, A6 = 2.85174e + 000, A7 = 0.00000e + 000, A8 = -4.06029e + 001, A9 = 0.00000e + 000, A10 = 2.93508e + 002, A12 = -8.99515e + 002
4: K = -3.32176e + 000, A3 = 1.87422e-001, A4 = -3.29029e + 000, A5 = 1.72062e + 000, A6 = -1.17147e + 001, A7 = 0.00000e + 000, A8 = 3.99078 e + 001, A9 = 0.00000e + 000, A10 = 5.16280e + 002, A11 = 0.00000e + 000, A12 = -6.78861e + 003, A13 = 0.00000e + 000, A14 = 2.16943e + 004
5: K = -1.21280e + 000, A3 = 1.08241e + 000, A4 = -2.50701e + 000, A5 = 1.79875e + 000, A6 = -1.29413e + 000, A7 = 0.00000e + 000, A8 =- 1.03574e + 001, A9 = 0.00000e + 000, A10 = 4.48482e + 001, A11 = 0.00000e + 000, A12 = 5.20148e + 001, A13 = 0.00000e + 000, A14 = -8.24828e + 001
6: K = -6.14011e-001, A3 = 1.16793e + 000, A4 = -2.07640e + 000, A5 = 3.48692e + 000, A6 = -1.45751e-001, A7 = 0.00000e + 000, A8 =- 2.52902e + 000, A9 = 0.00000e + 000, A10 = 2.92016e + 000, A11 = 0.00000e + 000, A12 = -7.44067e + 000, A13 = 0.00000e + 000, A14 = 9.24233e + 000
7: K = -5.00000e + 001, A3 = 4.43475e-001, A4 = -3.82731e + 000, A5 = 7.32317e + 000, A6 = -5.36081e + 000, A7 = 0.00000e + 000, A8 = 8.62393 e-001, A9 = 0.00000e + 000, A10 = 7.57066e-001, A11 = 0.00000e + 000, A12 = -6.23728e-001, A13 = 0.00000e + 000, A14 = -6.39495e-003

FL 1.746
Fno 2.40
w 69.84 °
Ymax 1.234
BF 0.619
TL 2.211

Elem Surfs Focal Length Diameter
1 1- 2 1.8606 1.057
2 4- 5 0.7286 1.054
3 6- 7 -0.8006 1.834

  FIG. 19 is an aberration diagram of Example 8 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d)).

Example 9
Table 9 shows lens data in Example 9. FIG. 20 is a sectional view of the lens of Example 9. The imaging lens according to the ninth exemplary embodiment includes, in order from the object side, a first lens L1, an aperture stop S, a second lens L2, and a third lens L3. The first lens L1 is a positive lens having a convex object side surface. The second lens L2 is a positive meniscus lens having a concave object surface, and the third lens L3 is an aspheric surface whose image side surface is concave near the optical axis, has an inflection point within the effective diameter, and is convex around the lens. It is a negative lens. CG is a parallel plate assuming a cover glass or an IR cut filter, and IM is an imaging surface of the solid-state imaging device.

[Table 9]
[Example 9]

Reference Wave Length = 587.56 nm
unit: mm

Surface number rd nd vd eff.diameter
OBJ INFINITY 350.0000
1 * 0.9046 0.3573 1.54470 56.09 1.054
2 * 3.9258 0.0717 0.763
STO INFINITY 0.3796 0.609
4 * -0.9067 0.4742 1.54470 56.09 0.880
5 * -0.4678 0.0201 1.225
6 * 1.0938 0.2500 1.54470 56.09 1.685
7 * 0.4309 0.2048 1.993
8 INFINITY 0.2100 1.52310 54.49 2.083
IMG INFINITY 0.3890

Aspheric coefficient
1: K = -4.65610e-001, A3 = 0.00000e + 000, A4 = 1.49423e-002, A5 = 0.00000e + 000, A6 = 5.72446e-001, A7 = 0.00000e + 000, A8 = -2.65903e + 000, A9 = 0.00000e + 000, A10 = 6.35086e + 000, A12 = -5.09613e + 000
2: K = 1.20013e + 001, A3 = 0.00000e + 000, A4 = -1.64630e-001, A5 = 0.00000e + 000, A6 = 3.29193e + 000, A7 = 0.00000e + 000, A8 = -4.34633e + 001, A9 = 0.00000e + 000, A10 = 2.58730e + 002, A12 = -5.58065e + 002
4: K = -2.54499e + 001, A3 = -9.31413e-002, A4 = -2.98041e + 000, A5 = 1.70580e + 000, A6 = -2.19356e + 000, A7 = 0.00000e + 000, A8 = 8.71661e + 001, A9 = 0.00000e + 000, A10 = -8.21247e + 002, A11 = 0.00000e + 000, A12 = 3.34236e + 003, A13 = 0.00000e + 000, A14 = -4.93676e + 003
5: K = -1.48536e + 000, A3 = 5.88871e-001, A4 = -2.14116e + 000, A5 = 1.70438e + 000, A6 = 2.08768e-001, A7 = 0.00000e + 000, A8 = -6.98350 e + 000, A9 = 0.00000e + 000, A10 = 2.12481e + 001, A11 = 0.00000e + 000, A12 = -1.78307e + 000, A13 = 0.00000e + 000, A14 = -1.57841e + 001
6: K = -9.20236e + 000, A3 = 1.29053e-001, A4 = -2.77143e + 000, A5 = 3.34916e + 000, A6 = 7.65998e-002, A7 = 0.00000e + 000, A8 = -2.42220 e + 000, A9 = 0.00000e + 000, A10 = 2.60599e + 000, A11 = 0.00000e + 000, A12 = -1.92579e + 000, A13 = 0.00000e + 000, A14 = 6.75292e-001
7: K = -9.51954e-001, A3 = -8.31912e-001, A4 = -3.56816e + 000, A5 = 7.54042e + 000, A6 = -5.27186e + 000, A7 = 0.00000e + 000, A8 = 8.06649e-001, A9 = 0.00000e + 000, A10 = 6.63896e-001, A11 = 0.00000e + 000, A12 = -6.75316e-001, A13 = 0.00000e + 000, A14 = 1.72049e-001

FL 1.725
Fno 2.40
w 70.00 °
Ymax 1.234
BF 0.725
TL 2.278

Elem Surfs Focal Length Diameter
1 1- 2 2.0714 1.054
2 4- 5 1.2848 1.225
3 6-7 -1.5054 1.993

  FIG. 21 is an aberration diagram of Example 9 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d)).

  Table 10 summarizes the values of the examples corresponding to the respective conditional expressions.

  In addition, the present invention is not limited to the embodiments and examples described in the specification, and includes other examples and modifications, and includes the embodiments, examples, and techniques described in the present specification. It will be apparent to those skilled in the art from the idea. For example, even when a dummy lens having substantially no power is further provided, it is within the scope of the present invention.

B Operation buttons D1 and D2 Display screen L1 First lens L2 Second lens L3 Third lens LN Imaging lens LU Imaging device Ape Aperture stop IM Image sensor IMa Photoelectric conversion unit T Mobile phone

The imaging lens according to claim 1, wherein the angle of view of the maximum image height is 65 ° or more and the F number is 3.0 or less.
It consists of the first lens, aperture stop, second lens, and third lens in order from the object side.
The first lens is a positive lens having a convex object side surface,
The second lens is a positive meniscus lens having a concave object surface,
The third lens is a negative lens whose image side surface is a concave surface near the optical axis, has an inflection point within the effective diameter, and is an aspheric surface that is a convex surface around the lens,
The following conditional expression is satisfied .
−5.0 <r3 / f <−0.4 (1)
0.0 <f1 / f2 <5.0 (2)
0.7 <Ds / Y <1.2 (5)
However,
r3: radius of curvature (mm) of the side surface of the second lens object
f: Focal length of the entire system (mm)
f1: Focal length (mm) of the first lens
f2: Focal length (mm) of the second lens
Ds: Distance from the aperture stop to the image plane (mm)
Y: Maximum image height (mm)

Conditional expression (1) is a conditional expression that regulates the ratio of the curvature radius of the object side surface of the second lens to the focal length of the entire system, and the curvature radius decreases as the value of conditional expression (1) falls below the lower limit. In the case of a small lens, particularly in a bright lens of F3 or less, the height of the light beam is higher than that of a dark lens, and the light beam is incident on the periphery of the lens having a larger angle of the lens surface. If the radius of curvature is so large that the value of conditional expression (1) exceeds the upper limit, the incident angle of the light ray on the surface becomes large, and it becomes difficult to suppress the occurrence of aberrations such as coma. Therefore, by satisfying conditional expression (1), it is possible to obtain a lens with good aberration correction while reducing decentration error sensitivity.
Conditional expression (5) is a conditional expression that defines the ratio of the distance from the aperture stop to the image plane and the maximum image height. When the value of conditional expression (5) exceeds the lower limit, the aperture stop is moved away from the image plane with respect to the maximum image height, and the exit pupil position is moved toward the object side, so that telecentricity can be improved. In addition, when the value of conditional expression (5) is less than the upper limit, it is possible to prevent the aperture stop from being too far from the image plane and to prevent the total optical length from increasing.

The imaging lens of Claim 4 satisfies the following conditional expressions in the invention of any one of Claims 1-3 .
0.15 <d1 / TTL <0.3 (6)
However,
d1: Core thickness of the first lens (mm)
TTL: Total length of the imaging lens (the flat plate is converted to air) (mm)

The imaging lens of Claim 5 satisfies the following conditional expressions in the invention in any one of Claims 1-4 .
−2.0 <(r1 + r2) / (r1−r2) <− 0.6 (7)
However,
r1: curvature radius (mm) of the side surface of the first lens object
r2: radius of curvature (mm) of the side surface of the first lens image

An imaging lens according to a sixth aspect of the invention is characterized in that, in the invention according to any one of the first to fifth aspects, the following conditional expression is satisfied.
−2.0 <r3 / f <−0.4 (8)

The imaging lens according to a seventh aspect is characterized in that, in the invention according to any one of the first to sixth aspects, the following conditional expression is satisfied.
0.7 <f1 / f2 <2.3 (9)

An imaging lens according to an eighth aspect is characterized in that, in the invention according to any one of the first to seventh aspects, the following conditional expression is satisfied.
0.1 <(r5 + r6) / (r5-r6) <2.0 (10)

An imaging lens according to a ninth aspect is characterized in that, in the invention according to any one of the first to eighth aspects, the following conditional expression is satisfied.
45 <v3 <70 (11)
v3: Abbe number of the third lens

The imaging lens according to claim 10 is the invention according to any one of claims 1 to 9, characterized by satisfying the following conditional expression.
TTL / f <1.5 (12)

An imaging lens according to an eleventh aspect is characterized in that, in the invention according to any one of the first to tenth aspects, the following conditional expression is satisfied.
D / TTL> 1.5 (13)
However,
D: Entrance pupil diameter (mm)

An imaging lens according to a twelfth aspect is characterized in that, in the invention according to any one of the first to eleventh aspects, the lens has substantially no power. That is, even when a dummy lens having substantially no power is added to the configuration of claim 1, it is within the scope of application of the present invention.

The imaging apparatus according to claim 13, characterized in that it comprises an imaging lens according to any one of claims 1 to 12.

A portable terminal according to a fourteenth aspect includes the imaging device according to the thirteenth aspect.

Claims (15)

In an imaging lens with a maximum image height of 65 ° or more and an F-number of 3.0 or less,
It consists of the first lens, aperture stop, second lens, and third lens in order from the object side.
The first lens is a positive lens having a convex object side surface,
The second lens is a positive meniscus lens having a concave object surface,
The third lens is a negative lens whose image side surface is a concave surface near the optical axis, has an inflection point within the effective diameter, and is an aspheric surface that is a convex surface around the lens,
An imaging lens satisfying the following conditional expression:
−5.0 <r3 / f <−0.4 (1)
0.0 <f1 / f2 <5.0 (2)
However,
r3: radius of curvature (mm) of the side surface of the second lens object
f: Focal length of the entire system (mm)
f1: Focal length (mm) of the first lens
f2: Focal length (mm) of the second lens The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
-1.0 <(r5 + r6) / (r5-r6) <2.5 (3)
However,
r5: radius of curvature (mm) of the side surface of the third lens object
r6: radius of curvature (mm) of the side surface of the third lens image The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
0.9 <f1 / f <1.2 (4) The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
0.7 <Ds / Y <1.2 (5)
However,
Ds: Distance from the aperture stop to the image plane (mm)
Y: Maximum image height (mm) The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
0.15 <d1 / TTL <0.3 (6)
However,
d1: Core thickness of the first lens (mm)
TTL: Total length of the imaging lens (the flat plate is converted to air) (mm) The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
−2.0 <(r1 + r2) / (r1−r2) <− 0.6 (7)
However,
r1: curvature radius (mm) of the side surface of the first lens object
r2: radius of curvature (mm) of the side surface of the first lens image The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
−2.0 <r3 / f <−0.4 (8) The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
0.7 <f1 / f2 <2.3 (9) The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
0.1 <(r5 + r6) / (r5-r6) <2.0 (10) The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
45 <v3 <70 (11)
v3: Abbe number of the third lens The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
TTL / f <1.5 (12) The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
D / TTL> 1.5 (13)
However,
D: Entrance pupil diameter (mm)   The imaging lens according to claim 1, comprising a lens that has substantially no power.   An imaging apparatus comprising the imaging lens according to claim 1.   A portable terminal comprising the imaging device according to claim 13.