WO2019044934A1 - Single-focus imaging optical system, lens unit, and imaging device - Google Patents

Abstract

Provided is a single-focus imaging optical system that is small-sized and has high optical performance despite having a wide angle of view. A single-focus imaging optical system 10 essentially comprises, in order from an object side, a first lens L1 having a negative refractive power, a biconcave second lens L2, a biconvex third lens L3, a diaphragm ST, a fourth lens L4 having a positive refractive power, a negative fifth lens L5 in which the object-side surface thereof is convex in the paraxial region, and a sixth lens L6 having a positive refractive power.

Description

Single focus imaging optical system, lens unit, and imaging apparatus

The present invention relates to a wide-angle single-focus imaging optical system, a lens unit, and an imaging apparatus, and more particularly to a single-focus imaging optical system having an angle of view of 180 ° or more.

In recent years, in the on-vehicle imaging optical system, it is required to have a small size and high resolution with an angle of view of 180 ° or more. As an imaging optical system of this type, in a six-lens configuration in which a negative lens, a negative lens, a positive lens, a positive lens, a negative lens, and a positive lens are arranged in order from the object side. One having a concave surface is known (see, for example, Patent Document 1).

However, in the imaging optical system of Patent Document 1, a wide angle of view can be secured, but the total optical length is long, the sagittal field curvature is large, the peripheral light amount ratio is low, etc. It could not be said that the above requirements were sufficiently met.

JP, 2013-73141, A

The present invention has been made in view of the above background art, and an object of the present invention is to provide a single-focus imaging optical system having a small size and high optical performance while having a wide angle of view.

Another object of the present invention is to provide a lens unit and an imaging apparatus provided with the single focus imaging optical system.

In order to achieve at least one of the above objects, the single-focus imaging optical system reflecting one aspect of the present invention includes, in order from the object side, a first lens having negative refractive power, and a first lens having a biconcave shape. 2 lens, a biconvex third lens, an aperture stop, a fourth lens having a positive refractive power, a negative fifth lens having a convex object side surface in the near-axis region, and a positive refractive power It substantially consists of the sixth lens.

In order to realize at least one of the above objects, a lens unit reflecting one aspect of the present invention includes the above-described single focus imaging optical system and a lens barrel that holds the single focus imaging optical system.

In order to realize at least one of the above objects, an imaging apparatus reflecting one aspect of the present invention includes the above-described single focus imaging optical system, and an imaging element for detecting an image obtained from the single focus imaging optical system. Equipped with

It is a figure explaining an imaging device provided with the single focus imaging optical system which is one embodiment of the present invention. FIG. 2A is a cross-sectional view of the single-focus imaging optical system of Example 1. FIGS. 2B and 2C are longitudinal aberration diagrams of Example 1. FIG. FIG. 3A is a cross-sectional view of the single focus imaging optical system of Example 2, and FIGS. 3B and 3C are longitudinal aberration diagrams of Example 2. FIG. FIG. 4A is a cross-sectional view of the single focus imaging optical system of Example 3, and FIGS. 4B and 4C are longitudinal aberration diagrams of Example 3. FIG. FIG. 5A is a cross-sectional view of the single focus imaging optical system of Example 4, and FIGS. 5B and 5C are longitudinal aberration diagrams of Example 4. FIG. 6A is a cross-sectional view of the single-focus imaging optical system of Example 5, and FIGS. 6B and 6C are longitudinal aberration diagrams of Example 5. FIG. 7A is a cross-sectional view of the single-focus imaging optical system of Example 6, and FIGS. 7B and 7C are longitudinal aberration diagrams of Example 6. FIG. 8A is a cross-sectional view of the single focus imaging optical system of Example 7, and FIGS. 8B and 8C are longitudinal aberration diagrams of Example 7. FIG. 9A is a cross-sectional view of the single focus imaging optical system of Example 8, and FIGS. 9B and 9C are longitudinal aberration diagrams of Example 8. FIG. 10A is a cross-sectional view of the single-focus imaging optical system of Example 9, and FIGS. 10B and 10C are longitudinal aberration diagrams of Example 9. FIG.

FIG. 1 is a view showing an imaging device 100 according to an embodiment of the present invention. The imaging device 100 includes a camera module 30 for forming an image signal, and a processing unit 60 that causes the camera module 30 to operate to exhibit a function as the imaging device 100.

The camera module 30 includes a lens unit 40 having a single focus imaging optical system 10 therein, and a sensor unit 50 for converting an object image formed by the single focus imaging optical system 10 into an image signal. The camera module 30 incorporates the single focus imaging optical system 10 described in detail below, and a wide angle of view can be secured, and the imaging device 100 having a small size and high optical performance can be provided.

The lens unit 40 includes a single focus imaging optical system 10 which is a wide-angle optical system, and a lens barrel 41 to which the single focus imaging optical system 10 is assembled.

The single-focus imaging optical system 10 includes first to sixth lenses L1 to L6, which will be described in detail later, and the first to third lenses L1 to L3 forming the front group on the object side with the diaphragm ST interposed therebetween. And the fourth to sixth lenses L4 to L6 constituting the rear group on the image side.

The lens barrel 41 is formed of metal, resin, a mixture of resin and glass fiber, or the like, and the single focus imaging optical system 10 is housed and held inside. When the lens barrel 41 is formed of a mixture of metal and resin with glass fiber, the lens barrel 41 is less likely to expand than the resin, and the single focus imaging optical system 10 can be stably fixed. The lens barrel 41 has an opening OP1 through which a ray bundle from the object side is made incident.

The first to sixth lenses L1 to L6 constituting the single-focus imaging optical system 10 are held directly or indirectly on the inner surface side of the lens barrel 41 at their flange portions or outer peripheral portions, and in the optical axis AX direction And the position perpendicular to the optical axis AX.

The sensor unit 50 includes a solid-state imaging device 51 that photoelectrically converts an object image formed by the single-focus imaging optical system 10, a substrate 52 supporting the solid-state imaging device 51 from behind and provided with wiring, peripheral circuits, and the like. And a sensor holder 53 for holding the solid-state imaging device 51 via the substrate 52. The solid-state imaging device 51 is, for example, a CMOS type image sensor. The substrate 52 includes wires for operating the solid-state imaging device 51, peripheral circuits, and the like. The sensor holder 53 is formed of a resin or other material, and supports the parallel flat plate F so as to face the solid-state image sensor 51 as well as positioning the solid-state image sensor 51 with respect to the optical axis AX. The lens barrel 41 of the lens unit 40 is fixed in a state of being positioned so as to be fitted to the sensor holder 53.

The solid-state imaging device (imaging device) 51 includes a photoelectric conversion unit 51a having an imaging surface I, and a signal processing circuit (not shown) is formed around the photoelectric conversion unit 51a. The solid-state imaging device 51 is not limited to the above-described CMOS-type image sensor, and may be one to which a CCD or the like is applied.

The parallel flat plate F disposed between the single focus imaging optical system 10 and the solid state imaging device 51 is an optical low pass filter, a seal glass of the solid state imaging device, an IR cut filter, a wavelength selection filter, or the like.

The processing unit 60 includes a drive unit 61, an input unit 62, a storage unit 63, a display unit 64, and a control unit 68. The drive unit 61 operates the solid-state imaging device 51 by receiving supply of a digital control signal or the like from the control unit 68. The drive unit 61 receives YUV and other digital pixel signals as image data from the solid-state imaging device 51 and transfers the digital pixel signals to the control unit 68. The input unit 62 is a unit for receiving a user's operation or a command from an external device, and the storage unit 63 is a unit for storing information necessary for the operation of the imaging device 100, image data acquired by the camera module 30, etc. The display unit 64 is a portion that displays information to be presented to the user, a photographed image, and the like. The control unit 68 integrally controls the operations of the drive unit 61, the input unit 62, the storage unit 63, and the like, and can perform various image processing on image data obtained by the camera module 30, for example. Such image data can be output to an external circuit.

The details of the single-focus imaging optical system 10 according to the embodiment will be described below with reference to FIG. The single-focus imaging optical system 10 illustrated in FIG. 1 has the same configuration as the single-focus imaging optical system 10A of Example 1 described later.

The illustrated single-focus imaging optical system 10 is a wide-angle lens for forming an object image on the imaging surface I of the solid-state imaging device 51, and is a first lens L1 having negative refractive power in order from the object side. A concave second lens L2, a biconvex third lens L3, an aperture stop ST, a fourth lens L4 having a positive refractive power, a negative fifth lens L5 having a convex object side surface in the near-axis region, and a positive lens And a sixth lens L6 having a refractive power of Here, the first lens L1 is a spherical type lens formed of glass and composed of a spherical surface, and the fourth lens L4 is an aspheric type lens formed of glass and composed of an aspheric surface. . The second, third, fifth and sixth lenses L2, L3, L5 and L6 are respectively made of plastic and have at least one aspheric shape.

The single-focus imaging optical system 10 is a wide-angle lens having an angle of view of 180 ° or more, and can be reduced in the diameter of the front lens by adopting a retrofocus type preceded by a negative lens. A back focus sufficient to install sealing glass or the like of the imaging element 51 can be secured. In addition, by making the negative lens into a two-lens configuration of the first and second lenses L1 and L2, it is possible to divide negative power and to improve the performance and reduce the error sensitivity more than when one negative lens is provided. . Also, by making the third lens L3 biconvex shape, a sufficient positive power is secured, and in the lens group before the stop ST, the aberration generated in the negative lens of the first lens L1 and the second lens L2 is cancelled. Good optical performance can be secured. Further, by arranging the fourth lens L4, the fifth lens L5, and the sixth lens L6 to be a positive / negative positive power arrangement, so-called triplets can be obtained, and aberration correction in the lens group behind the aperture stop ST becomes good. Furthermore, if the object side surface S51 of the fifth lens L5 is a convex surface in the paraxial region, the principal point interval between the fourth lens L4 and the fifth lens L5 increases, and the fourth and fifth lenses L4 and L5 have the same power. However, since the combined power of the fourth lens L4 and the fifth lens L5 can be made stronger than when the principal point interval is narrow, aberration and error sensitivity generated in each of the fourth and fifth lenses L4 and L5 are suppressed. Thus, the single-focus imaging optical system 10 can be miniaturized. The fourth and fifth lenses L4 and L5, the fifth and sixth lenses L5 and L6, and the like may be cemented to each other in order to suppress chromatic aberration, spherical aberration, and error sensitivity.

The single-focus imaging optical system 10 satisfies the following conditional expression (1).
0.1 <(d34 / f) / (tan (w / 2)) <0.8 (1)
Here, the value d34 is the distance between the third lens L3 and the fourth lens L4, the value f is the focal length of the entire system, and the value w is the maximum half angle of view.

When the value (d34 / f) / (tan (w / 2)) of the conditional expression (1) exceeds the lower limit, the distance between the third lens L3 and the fourth lens L4 does not become too narrow and interference is prevented. And the error sensitivity of both lenses can be suppressed. On the other hand, when the value (d34 / f) / (tan (w / 2)) of the above conditional expression falls below the upper limit, the enlargement of the optical system can be prevented.

The single-focus imaging optical system 10 satisfies the following conditional expression (2).
-3 ≦ f2 / f ≦ -1 (2)
Here, the value f2 is the focal length of the second lens L2.

By setting the value f2 / f of the conditional expression (2) below the upper limit, the refractive power of the second lens L2 does not become too strong, and the performance variation due to the astigmatism and the manufacturing error generated here can be suppressed. it can. On the other hand, by setting the value f2 / f of the conditional expression (2) to the lower limit or more, the refractive power of the second lens L2 does not become too weak, and the optical system can be kept compact.

The single focus imaging optical system 10 satisfies the following conditional expression (3).
3 ≦ f3 / f ≦ 6 (3)
Here, the value f3 is the focal length of the third lens L3.

By setting the value f3 / f of the conditional expression (3) to the lower limit or more, the refractive power of the third lens L3 does not become too strong, and the performance variation due to the spherical aberration and coma aberration generated here and the manufacturing error is suppressed. be able to. On the other hand, by setting the value f3 / f of the conditional expression (3) below the upper limit, the refractive power of the third lens L3 does not become too weak, and the optical system can be kept compact.

The single focus imaging optical system 10 satisfies the following conditional expression (4).
-3 ≦ f5 / f ≦ -1 (4)
Here, the value f5 is the focal length of the fifth lens.

By making the value f5 / f of the conditional expression (4) not more than the upper limit, the refractive power of the fifth lens L5 does not become too strong, and suppressing the performance variation due to the astigmatism and the manufacturing error generated here. it can. On the other hand, by setting the value f5 / f of the conditional expression (4) to the lower limit or more, the refractive power of the fifth lens L5 does not become too weak, and the optical system can be kept compact.

The single focus imaging optical system 10 satisfies the following conditional expression (5).
2 ≦ f1 / f2 ≦ 5.5 (5)

By setting the value f1 / f2 of the conditional expression (5) above the lower limit, the refractive power of the first lens L1 does not become too strong relative to the second lens L2, and the burden on the first lens L1 can be relatively reduced. Astigmatism and error sensitivity generated in the first lens L1 can be suppressed. On the other hand, by setting the value f1 / f2 of the conditional expression (5) below the upper limit, the refractive power of the second lens L2 does not become too strong relative to the first lens L1, and the load on the second lens L2 is relatively reduced. As a result, it is possible to suppress astigmatism and error sensitivity generated in the second lens L2.

The single focus imaging optical system 10 satisfies the following conditional expression (6).
−8 ≦ f1 / f ≦ −5 (6)

By making the value f1 / f of the conditional expression (6) not more than the upper limit, the refractive power of the first lens L1 does not become too strong, and the performance variation due to the astigmatism and the manufacturing error generated here can be suppressed. it can. On the other hand, by setting the value f1 / f of the conditional expression (6) to the lower limit or more, the refractive power of the first lens L1 does not become too weak and the diameter of the front lens does not become too large. can do.

The single focus imaging optical system 10 satisfies the following conditional expression (7).
1.5 ≦ f4 / f ≦ 3 (7)
Here, the value f4 is the focal length of the fourth lens L4.

By setting the value f4 / f of the conditional expression (7) to the lower limit or more, the refractive power of the fourth lens L4 does not become too strong, and the performance variation due to the spherical aberration and coma aberration generated here and the manufacturing error is suppressed. be able to. On the other hand, by setting the value f4 / f of the conditional expression (7) below the upper limit, the refractive power of the fourth lens L4 does not become too weak, and the optical system can be kept compact.

The single-focus imaging optical system 10 satisfies the following conditional expression (8).
−0.4 ≦ f × Σ (1 / fplk) ≦ −0.2 (8)
Here, the value fplk is the focal length of the k-th plastic lens from the object side.

As described above, by using the second lens L2, the third lens L3, the fifth lens L5, and the sixth lens L6 as the plastic lenses, one set of plastic lenses of positive and negative power is disposed before and after the stop. It is possible to suppress the focus movement and the aberration fluctuation at the time of temperature change. Here, the second lens L2 is k = 1, the third lens L3 is k = 2, the fifth lens L5 is k = 3, and the sixth lens L6 is k = 4. Further, by setting the value f × Σ (1 / fplk) of the conditional expression (8) to the lower limit or more, the sum of the focal lengths of the plastic lens does not become too large to the negative value side. The distance from the lens to the focal point does not become too short when changing, and the distance from the lens to the focal point does not become too long when the temperature changes to the low temperature side. On the other hand, by setting the value f × Σ (1 / fplk) in the conditional expression (8) to the upper limit or less, the sum of the focal lengths of the plastic lenses does not become too small to the negative value side. The distance from the lens to the focal point does not become too long when changed, and the distance from the lens to the focal point does not become too short when the temperature changes to the low temperature side. In addition, plasticizing the lenses L2, L3, L5, and L6 reduces the weight of the optical system, and adds an aspheric surface by injection molding or the like to increase the shape freedom more than at a spherical surface, and correct aberrations well. Can be

The single focus imaging optical system 10 satisfies the following conditional expression (9).
L L 4 65 65 (9)
Here, the value LL4 is the Abbe number of the fourth lens L4.

By satisfying the conditional expression (9), it is possible to suppress the chromatic aberration generated by the fourth lens L4 to a small value. Note that for the value LL4,
L L 4 70 70
If you make it effective,
L L 4 75 75
The effect will be further enhanced if you

The single focus imaging optical system 10 satisfies the following conditional expression (10).
1.8 ≦ nL1 (10)
Here, the value nL1 is the refractive index of the first lens L1.

By satisfying the conditional expression (10), the radius of curvature can be relaxed even if the first lens L1 has the same power, and astigmatism and the like generated on this surface can be reduced. Further, even if the power of the first lens L1 is increased to reduce the diameter of the front lens, aberrations are relatively unlikely to occur, and both downsizing and high performance of the optical system can be achieved.

The single-focus imaging optical system 10 may further include another optical element (for example, a lens, a filter member, and the like) that does not substantially have a refractive power.

The single focus imaging optical system 10 of the present embodiment is premised to be used for a fixed focus camera module 30 or an imaging apparatus 100 having no focus function. That is, the lens barrel 41 is not provided with the movable mechanism of the lens.

The parallel flat plate F is not essential. For example, it is desirable that the filter for wavelength selection not have a separately disposed structure but its function be imparted to the lens. For example, in the case of an infrared cut filter, infrared cut coating may be performed on the surface of one or more lenses.

As applications of the single focus imaging optical system 10 or the imaging apparatus 100, security cameras such as surveillance cameras, door phone cameras, authentication cameras or lenses for marketing cameras, lenses for in-vehicle cameras mounted on automobiles or other moving objects, medical Examples include endoscopes, healthcare measurements, industrial endoscopes and other medical or industrial optical lenses. Of course, the single-focus imaging optical system 10 or the imaging apparatus 100 may be applied to applications other than these where wide angle is required.

〔Example〕
Hereinafter, examples of the single-focus imaging optical system according to the present invention will be described. The symbols used in each example are as follows. In addition, the unit of the thing regarding length is mm when not shown in particular, and the unit of an angle is degree (degree).
Fno: F-number w: Maximum half angle of view R: Curvature radius d: Axial surface distance nd: Refractive index dd for d-line of lens material: Abbe number ymax of lens material: Maximum image height TL: Optical total length BF: From final surface Distance to back focus

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 denoted by h in the following "Equation 1".

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

Example 1
The entire specifications of the single-focus imaging optical system of Example 1 are shown in Table 1 below.
[Table 1]
f (mm) 1.28
Fno 2.0
w (°) 110.0
ymax (mm) 2.64
TL (mm) 17.28
BF (mm) 2.41

The data of the lens surface of the single focus imaging optical system of Example 1 is shown in Table 2 below. In the following Table 1 and the like, the surface number is represented by “Surf. N”, the aperture stop is represented by “ST”, and infinity is represented by “INF”. “Image” represents the imaging plane I of the imaging device (or the imaging plane of the single focus imaging optical system).
[Table 2]
Surf.N R (mm) d (mm) nd d d
1 14.4.948 1.95 1.80422 46.5
2 4.478 2.84
3 * -15.768 0.80 1.54537 56.1
4 * 1.522 1.86
5 * 3.579 2.70 1.63414 23.8
6 * -91.690 0.10
7 (ST) INF 0.19
8 * 3.991 1.56 1.49707 81.5
9 * -1.771 0.10
10 * 83.435 0.50 1.63414 23.8
11 * 1.661 0.21
12 * 4.703 1.83 1.54537 56.1
13 *-2.402 1.75
14 INF 0.70 1.51680 64.2
15 INF 0.19
image INF

The aspherical coefficients of the lens surface of the single focus imaging optical system of Example 1 are shown in Table 3 below. In the following it (including lens data in Tables), and represents an exponent of 10 (for example, 2.5 × ^{10 -02)} with E (e.g. 2.5E-02).
[Table 3]
Third side
K = 8.177, A3 = 2.9122 E-03, A4 = 6.8859 E-03, A5 = 1.2882 E-04,
A6 = -1.4675E-03, A7 = 5.4797E-06, A8 = 3.7579E-04, A10 = -1.1690E-04,
A12 = 2.5813E-05, A14 = -3.5407E-06, A16 = 2.8986E-07, A18 = -1.3003E-08,
A20 = 2.4619 E-10
Fourth side
K = -0.618, A3 = -1.8403E-02, A4 = 2.7319E-02, A5 = -1.7877E-02,
A6 = 6.8163 E-02, A7 = 1.4196 E-03, A8 =-1.4395 E-01, A10 = 1.7561 E-01,
A12 = -1.2736E-01, A14 = 5.6561E-02, A16 = -1.5128E-02, A18 = 2.2408E-03,
A20 = -1.4118E-04
Fifth side
K = -1.339, A3 = 5.058E-03, A4 = -8.3782E-03, A5 = 7.4303E-03,
A6 = 5.0572E-03, A7 = -4.3043E-03, A8 = -6.8005E-04, A10 = 1.1515E-03,
A12 = -2.6825E-04, A14 = 2.4781E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
20 = 0.0000 E + 00
Sixth face
K = 50.000, A3 = 1.1601 E-02, A4 = -4.2851 E-02, A5 = 3.9594 E-02,
A6 = 9.3009 E-03, A7 = -3.0137 E-02, A8 = 1.5370 E-02, A10 = 4.0880 E-03,
A12 = -3.7404 E-03, A14 = 1.9481 E-03, A16 = 0.0000 E + 00, A18 = 0.0000 E + 00,
A20 = 0.0000E + 00
Eighth side
K = 1.566, A3 = 0.0000E + 00, A4 = -2.5562E-02, A5 = 0.0000E + 00,
A6 = 5.1635E-03, A7 = 0.0000E + 00, A8 = 1.8542E-03, A10 = 6.4855E-04,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
9th surface
K = -1.279, A3 = 0.0000E + 00, A4 = -3.5301E-02, A5 = 0.0000E + 00,
A6 = 4.7025E-02, A7 = 0.0000E + 00, A8 = −2.9033E-02, A10 = 7.2750E-03,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Face 10
K = -50.000, A3 = 8.2491E-03, A4 = -1.7870E-01, A5 = -3.1470E-02,
A6 = 1.4931 E-01, A7 = 4.5245 E-03, A8 =-7.4142 E-02, A10 = 2.1139 E-02,
A12 = -2.4474E-03, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
11th
K = -5.043, A3 = 5.7907 E-03, A4 =-3.5754 E-02, A5 =-7.1703 E-03,
A6 = 2.3103E-02, A7 = 9.6540E-04, A8 = -5.9669E-03, A10 = 1.3702E-04,
A12 = 2.4155E-04, A14 = -3.7281E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
12th
K = 2.031, A3 = -1.4788E-03, A4 = 2.6926E-02, A5 = 8.8579E-04,
A6 = -2.7672E-02, A7 = -1.7193E-04, A8 = 1.2452 E-02, A10 = -3.0937E-03,
A12 = 4.0798E-04, A14 = -2.1747E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
13th surface
K = -1.597, A3 = 1. 2010 E-02, A4 =-1.8975 E-02, A5 = 3.3317 E-03,
A6 = 1.8603 E-03, A7 = -7.8071 E-04, A8 = 1.4932 E-03, A10 =-8.8219 E-04,
A12 = 2.4340E-04, A14 = -2.1285E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00

FIG. 2A is a cross-sectional view of the single-focus imaging optical system 10A of Example 1 and the like. Specifically, the single-focus imaging optical system 10A includes, in order from the object side, the negative first lens L1, the negative second lens L2, the positive third lens L3, the stop (or aperture stop) ST, and the positive third It consists essentially of a four lens L4, a negative fifth lens L5, and a positive sixth lens L6. Here, the first and fourth lenses L1 and L4 are made of glass, and the second, third, fifth and sixth lenses L2, L3, L5 and L6 are made of plastic. Between the sixth lens L6 and the solid-state imaging device 51, a parallel plate (filter) F of an appropriate thickness is disposed. The parallel flat plate (filter) F is a parallel flat plate on which an optical low pass filter, an IR cut filter, a seal glass of the solid-state imaging device 51, and the like are assumed. Reference symbol I indicates an imaging surface which is a projection surface of the solid-state imaging device 51. In addition, about the code | symbol F and I, it is the same also in the subsequent Example.

FIGS. 2B and 2C show longitudinal aberration diagrams (spherical aberration and astigmatism) of the single-focus imaging optical system 10A of Example 1. FIG. In the above spherical aberration diagram, "F2.0" represents an F value. In the above astigmatism diagrams, a solid line represents a sagittal image plane, and a dotted line represents a meridional image plane.

In the single-focus imaging optical system 10A of Example 1, the amount of focus movement (normal temperature) of the plastic lens (specifically, the second, third, fifth, and sixth lenses L2, L3, L5, L6) due to temperature change The movement amount when changing from (25 ° C.) to 105 ° C. is −0.012 mm.

(Example 2)
Table 4 below shows the overall specifications of the single-focus imaging optical system of Example 2.
[Table 4]
f (mm) 1.29
Fno 2.0
w (°) 110.0
ymax (mm) 2.63
TL (mm) 17.08
BF (mm) 2.41

The data of the lens surface of the single focus imaging optical system of Example 2 is shown in Table 5 below.
[Table 5]
Surf.N R (mm) d (mm) nd d d
1 13.676 1.52 1.80422 46.5
2 4.215 3.15
3 * -14.962 0.72 1.54537 56.1
4 * 1.562 1.52
5 * 4.199 1.83 1.63414 23.8
6 * -14.009 1.07
7 (ST) INF 0.31
8 * 3.425 1.49 1.49707 81.5
9 * -2.071 0.10
10 * 14.034 0.50 1.63414 23.8
11 * 1.532 0.22
12 * 4.648 1.99 1.54537 56.1
13 * -2.386 1.80
14 INF 0.70 1.51680 64.2
15 INF 0.16
image INF

The aspheric coefficients of the lens surface of the single focus imaging optical system of Example 2 are shown in Table 6 below.
[Table 6]
Third side
K = 7.566, A3 = 2.4059E-03, A4 = 6.7886E-03, A5 = 1.5876E-04,
A6 = -1.4531 E-03, A7 = 1.0861 E-05, A8 = 3.7756 E-04, A10 = -1.1694 E-04,
A12 = 2.5800E-05, A14 = -3.5419E-06, A16 = 2.8990E-07, A18 = -1.3000E-08,
A20 = 2.4614 E-10
Fourth side
K = −0.636, A3 = −1.7963E-02, A4 = 2.6297E-02, A5 = −2.2119E-02,
A6 = 6.7525E-02, A7 = 2.3796E-03, A8 = -1.4308E-01, A10 = 1.7545E-01,
A12 = -1.2752E-01, A14 = 5.6559E-02, A16 = -1.5110E-02, A18 = 2.2467E-03,
A20 = -1.4344E-04
Fifth side
K = -6.071, A3 = 1.1727E-02, A4 = -1.7362E-02, A5 = 8.1756E-03,
A6 = 6.3251E-03, A7 = -5.2786E-03, A8 = -1.8255E-03, A10 = 1.291E-03,
A12 = -7.9217E-05, A14 = -1.6051E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Sixth face
K = 50.000, A3 = 1.4495E-02, A4 = -3.7973E-02, A5 = 2.0198E-02,
A6 = 6.2818 E-03, A7 =-2.4038 E-02, A8 = 1.6241 E-02, A10 =-3.5043 E-03,
A12 = 7.4491E-04, A14 = -7.9312E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Eighth side
K = 2.735, A3 = 0.0000E + 00, A4 = -1.6443E-02, A5 = 0.0000E + 00,
A6 = -3.5398E-03, A7 = 0.0000E + 00, A8 = 1.982E-04, A10 = -5.3842E-05,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
9th surface
K = -2.435, A3 = 0.0000E + 00, A4 = -2.7758E-02, A5 = 0.0000E + 00,
A6 = 4.2115E-02, A7 = 0.0000E + 00, A8 = -2.6062E-02, A10 = 5.9446E-03,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Face 10
K = 46.757, A3 = 3.2300E-03, A4 = -1.7990E-01, A5 = -2.7138E-02,
A6 = 1.4965 E-01, A7 = 3.2825 E-03, A8 = -7.5182 E-02, A10 = 2.1153 E-02,
A12 = -2.2887E-03, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
11th
K = −5.011, A3 = 5.2164 E-03, A4 = −3.5735 E-02, A5 = −6.988 E-03,
A6 = 2.3178 E-02, A7 = 9.2811 E-04, A8 = -6.0244 E-03, A10 = 1.3699 E-04,
A12 = 2.5233E-04, A14 = -3.8502E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
12th
K = 2.133, A3 = -1.7423E-03, A4 = 2.6953E-02, A5 = 1.0065E-03,
A6 = -2.7602E-02, A7 = -1.4967E-04, A8 = 1.2445E-02, A10 = -3.1059E-03,
A12 = 4.0522E-04, A14-2.1178E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
13th surface
K = -1.436, A3 = 1.6256E-02, A4 = -1.9462E-02, A5 = 3.3046E-03,
A6 = 1.8950 E-03, A7 = -7.8831 E-04, A8 = 1.4717 E-03, A10 = -8.9090 E-04,
A12 = 2.4211E-04, A14 = -2.1108E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00

FIG. 3A is a cross-sectional view of the single-focus imaging optical system 10B and the like of the second embodiment. Specifically, the single-focus imaging optical system 10B includes, in order from the object side, a negative first lens L1, a negative second lens L2, a positive third lens L3, a stop (or an aperture stop) ST, and a positive third It consists essentially of a four lens L4, a negative fifth lens L5, and a positive sixth lens L6. Here, the first and fourth lenses L1 and L4 are made of glass, and the second, third, fifth and sixth lenses L2, L3, L5 and L6 are made of plastic. Between the sixth lens L6 and the solid-state imaging device 51, a parallel flat plate F of an appropriate thickness is disposed.

FIGS. 3B and 3C show longitudinal aberration diagrams (spherical aberration and astigmatism) of the single-focus imaging optical system 10B of Example 2. FIG.

In the single-focus imaging optical system 10B of Example 2, the amount of focus movement (normal temperature) of the plastic lens (specifically, the second, third, fifth, and sixth lenses L2, L3, L5, L6) due to temperature change The movement amount when changing from (25 ° C.) to 105 ° C. is −0.012 mm.

(Example 3)
Table 7 below shows the overall specifications of the single-focus imaging optical system of Example 3.
[Table 7]
f (mm) 1.29
Fno 2.0
w (°) 110.0
ymax (mm) 2.64
TL (mm) 16.86
BF (mm) 2.30

Data of the lens surface of the single focus imaging optical system of Example 3 is shown in Table 8 below.
[Table 8]
Surf.N R (mm) d (mm) nd d d
1 14.663 1.89 1.80422 46.5
2 4.505 2.87
3 * -14.840 0.72 1.54537 56.1
4 * 1.486 1.43
5 * 3.585 2.70 1.63414 23.8
6 * -18.621 0.32
7 (ST) INF 0.19
8 * 4.679 1.54 1.49707 81.5
9 *-1.915 0.10
10 * 64.813 0.50 1.63414 23.8
11 * 1.658 0.20
12 * 4.717 1.86 1.54537 56.1
13 *-2.290 1.66
14 INF 0.70 1.51680 64.2
15 INF 0.18
image INF

The aspheric coefficients of the lens surface of the single-focus imaging optical system of Example 3 are shown in Table 9 below.
[Table 9]
Third side
K = 7.594, A3 = 2. 1971 E-03, A4 = 6.8202 E-03, A5 = 1.5609 E-04,
A6 = -1.4519E-03, A7 = 1.1047E-05, A8 = 3.7732E-04, A10 =-1.1694E-04,
A12 = 2.5796E-05, A14 = -3.5415E-06, A16 = 2.8988E-07, A18 = -1.2996E-08,
A20 = 2.4596 E-10
Fourth side
K = -0.633, A3 = -1.6093E-02, A4 = 2.5740E-02, A5 = -2.1820E-02,
A6 = 6.7827 E-02, A7 = 2.3139 E-03, A8 =-1.4322 E-01, A10 = 1.7541 E-01,
A12 = -1.2750E-01, A14 = 5.6569E-02, A16 = -1.5110E-02, A18 = 2.2451E-03,
A20 = -1.4329E-04
Fifth side
K = -3.180, A3 = 9.8086E-03, A4 = -1.3714E-02, A5 = 9.1916E-03,
A6 = 5.9973E-03, A7 = -5.1223E-03, A8 = -1.5073E-03, A10 = 1.1719E-03,
A12 = -1.2353E-04, A14 = -9.5201E-06, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Sixth face
K = 50.000, A3 = 1.2089E-02, A4 = -4.5584E-02, A5 = 2.8040E-02,
A6 = 7.3616E-03, A7 = -2.6162E-02, A8 = 1.5622E-02, A10 = -3.3147E-03,
A12 = 1.7671E-03, A14 = -5.5140E-04, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Eighth side
K = -0.869, A3 = 0.0000E + 00, A4 = -2.4364E-02, A5 = 0.0000E + 00,
A6 = 1.1239 E-03, A7 = 0.0000 E + 00, A8 = -5.2247 E-03, A10 = 1.8589 E-03,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
9th surface
K = -1.459, A3 = 0.0000 E + 00, A4 =-3.9516 E-02, A5 = 0.0000 E + 00,
A6 = 4.1884 E-02, A7 = 0.0000 E + 00, A8 = -2.6548 E-02, A10 = 5.8226 E-03,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Face 10
K = 50.000, A3 = 4.5611 E-03, A4 = -1.8509 E-01, A5 =-2.8912 E-02,
A6 = 1.4998E-01, A7 = 3.8652E-03, A8 = -7.4621E-02, A10 = 2.1403E-02,
A12 = -2.3352 E-03, A14 = 0.0000 E + 00, A16 = 0.0000 E + 00, A18 = 0.0000 E + 00,
A20 = 0.0000E + 00
11th
K = -5.031, A3 = 2.0367E-03, A4 = -3.6268E-02, A5 = -7.1188E-03,
A6 = 2.3226E-02, A7 = 1.0057E-03, A8 = -5.9646E-03, A10 = 1.4466E-04,
A12 = 2.4795E-04, A14 = -3.9311E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
12th
K = 2.124, A3 = -2.6877 E-03, A4 = 2.6488 E-02, A5 = 9.5379 E-04,
A6 = -2.7549E-02, A7 = -9.8604E-05, A8 = 1.2480E-02, A10 = -3.0961E-03,
A12 = 4.0643E-04, A14 = -2.1539E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
13th surface
K = -1.458, A3 = 1.2938E-02, A4 = -1.9467E-02, A5 = 3. 2776E-03,
A6 = 1.9054E-03, A7 = -7.5042E-04, A8 = 1.5131E-03, A10 = -8.7550E-04,
A12 = 2.4485E-04, A14 = -2.1154E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00

FIG. 4A is a cross-sectional view of the single-focus imaging optical system 10C of Example 3 and the like. Specifically, the single-focus imaging optical system 10C includes, in order from the object side, a negative first lens L1, a negative second lens L2, a positive third lens L3, a stop (or an aperture stop) ST, and a positive third It consists essentially of a four lens L4, a negative fifth lens L5, and a positive sixth lens L6. Here, the first and fourth lenses L1 and L4 are made of glass, and the second, third, fifth and sixth lenses L2, L3, L5 and L6 are made of plastic. Between the sixth lens L6 and the solid-state imaging device 51, a parallel flat plate F of an appropriate thickness is disposed.

FIGS. 4B and 4C show longitudinal aberration diagrams (spherical aberration and astigmatism) of the single-focus imaging optical system 10C of Example 3. FIG.

In the single-focus imaging optical system 10C of Example 3, the amount of focus movement (normal temperature) due to the temperature change of the plastic lenses (specifically, the second, third, fifth, and sixth lenses L2, L3, L5, L6) The movement amount when changing from (25 ° C.) to 105 ° C. is −0.012 mm.

(Example 4)
The entire specifications of the single-focus imaging optical system of Example 4 are shown in Table 10 below.
[Table 10]
f (mm) 1.29
Fno 2.0
w (°) 110.0
ymax (mm) 2.64
TL (mm) 16.83
BF (mm) 2.26

The data of the lens surface of the single focus imaging optical system of Example 4 is shown in Table 11 below.
[Table 11]
Surf.N R (mm) d (mm) nd d d
1 14.657 1.89 1.80422 46.5
2 4.507 2.87
3 * -14.852 0.72 1.54537 56.1
4 * 1.486 1.43
5 * 3.553 2.69 1.63414 23.8
6 * -19.085 0.31
7 (ST) INF 0.19
8 * 4.755 1.56 1.49707 81.5
9 * -2.075 0.10
10 * 74.903 0.50 1.63414 23.8
11 * 1.660 0.20
12 * 4.719 1.85 1.54537 56.1
13 *-2.276 1.63
14 INF 0.70 1.51680 64.2
15 INF 0.16
image INF

The aspheric coefficients of the lens surface of the single focus imaging optical system of Example 4 are shown in Table 12 below.
[Table 12]
Third side
K = 7.569, A3 = 2.2076 E-03, A4 = 6.8225 E-03, A5 = 1.5660 E-04,
A6 = -1.4518E-03, A7 = 1.1071E-05, A8 = 3.732 E-04, A10 = -1.1694 E-04,
A12 = 2.5796E-05, A14 = -3.5415E-06, A16 = 2.8988E-07, A18 = -1.2996E-08,
A20 = 2.4597 E-10
Fourth side
K = -0.632, A3 = -1.5977E-02, A4 = 2.5841E-02, A5 = -2.1768E-02,
A6 = 6.7851 E-02, A7 = 2.3251 E-03, A8 =-1.4322 E-01, A10 = 1.7541 E-01,
A12 = -1.2750E-01, A14 = 5.6569E-02, A16 = -1.5110E-02, A18 = 2.2451E-03,
A20 = -1.4330E-04
Fifth side
K = -3.192, A3 = 9.7628E-03, A4 = -1.3750E-02, A5 = 9.1553E-03,
A6 = 5.9684E-03, A7 = -5.1419E-03, A8 = -1.5193E-03, A10 = 1.1679E-03,
A12 = -1.2491E-04, A14 = -1.0061E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Sixth face
K = 50.000, A3 = 1.2670E-02, A4 = -4.6119E-02, A5 = 2.7324E-02,
A6 = 6.8200E-03, A7 = -2.6430E-02, A8 = 1.5607E-02, A10 = -3.0660E-03,
A12 = 1.9365E-03, A14 = -6.5841E-04, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Eighth side
K = −0.324, A3 = 0.0000E + 00, A4 = −2.3699E-02, A5 = 0.0000E + 00,
A6 = 1.8906E-03, A7 = 0.0000E + 00, A8 = -4.9243E-03, A10 = 1.6463E-03,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
9th surface
K = -1.487, A3 = 0.0000E + 00, A4 = -3.9228E-02, A5 = 0.0000E + 00,
A6 = 4.1926E-02, A7 = 0.0000E + 00, A8 = -2.6513E-02, A10 = 5.8457E-03,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Face 10
K = -0.272, A3 = 3.5746E-03, A4 = -1.8542E-01, A5 =-2.9014E-02,
A6 = 1.4994E-01, A7 = 3.8404E-03, A8 = -7.4640E-02, A10 = 2.1391 E-02,
A12 = -2.3400E-03, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
11th
K = -4.999, A3 = 2.1857 E-03, A4 = -3.6230 E-02, A5 =-7.1083 E-03,
A6 = 2.3230 E-02, A7 = 1.0081 E-03, A8 = -5.9632 E-03, A10 = 1.4502 E-04,
A12 = 2.4795E-04, A14 = -3.9367E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
12th
K = 2.124, A3 = -2.7572 E-03, A4 = 2.6476 E-02, A5 = 9.5377 E-04,
A6 = -2.7547 E-02, A7 = -9.7711 E-05, A8 = 1.2480 E-02, A10 = -3.0960 E-03,
A12 = 4.0649E-04, A14 = -2.1514E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
13th surface
K = -1.470, A3 = 1.3169E-02, A4 = -1.9395E-02, A5 = 3.3022E-03,
A6 = 1.9137E-03, A7 = -7.4771E-04, A8 = 1.5139E-03, A10 = -8.7547E-04,
A12 = 2.4483 E-04, A14 = -2.1162 E-05, A16 = 0.0000 E + 00, A18 = 0.0000 E + 00,
A20 = 0.0000E + 00

FIG. 5A is a cross-sectional view of the single focus imaging optical system 10D and the like of the fourth embodiment. Specifically, the single-focus imaging optical system 10D includes, in order from the object side, a negative first lens L1, a negative second lens L2, a positive third lens L3, a stop (or an aperture stop) ST, and a positive third It consists essentially of a four lens L4, a negative fifth lens L5, and a positive sixth lens L6. Here, the first and fourth lenses L1 and L4 are made of glass, and the second, third, fifth and sixth lenses L2, L3, L5 and L6 are made of plastic. Between the sixth lens L6 and the solid-state imaging device 51, a parallel flat plate F of an appropriate thickness is disposed.

5B and 5C show longitudinal aberration diagrams (spherical aberration and astigmatism) of the single-focus imaging optical system 10D of Example 4. FIG.

In the single-focus imaging optical system 10D of the fourth embodiment, the amount of focus movement (normal temperature) of the plastic lens (specifically, the second, third, fifth, and sixth lenses L2, L3, L5, L6) due to temperature change The movement amount when changing from (25 ° C.) to 105 ° C. is −0.012 mm.

(Example 5)
The entire specifications of the single-focus imaging optical system of Example 5 are shown in Table 13 below.
[Table 13]
f (mm) 1.36
Fno 2.0
w (°) 110.0
ymax (mm) 2.64
TL (mm) 19.93
BF (mm) 2.59

Data of the lens surface of the single focus imaging optical system of Example 5 are shown in Table 14 below.
[Table 14]
Surf.N R (mm) d (mm) nd d d
1 13.641 1.27 2.00100 29.1
2 4.441 3.23
3 * -12.988 1.08 1.54438 55.9
4 * 1.795 1.36
5 * 3.018 4.70 1.63469 23.9
6 *-14.499 0.17
7 (ST) INF 0.33
8 * 33.773 1.60 1.49710 81.6
9 * -1.826 0.20
10 * 17.013 0.59 1.63469 23.9
11 * 1.718 0.22
12 * 4.624 2.34 1.54438 55.9
13 *-2.431 2.01
14 INF 0.70 1.51680 64.2
15 INF 0.12
image INF

The aspheric coefficients of the lens surface of the single focus imaging optical system of Example 5 are shown in Table 15 below.
[Table 15]
Third side
K = 9.411, A3 = 0.0000E + 00, A4 = -2.0521E-02, A5 = 0.0000E + 00,
A6 = 1.2479E-02, A7 = 0.0000E + 00, A8 = -3.7741E-03, A10 = 7.2014E-04,
A12 = -9.0731E-05, A14 = 7.5339E-06, A16 = -3.9609E-07, A18 = 1.1935E-08,
A20 = -1.5674E-10
Fourth side
K = -1.485, A3 = 0.0000E + 00, A4 = -2.2031E-02, A5 = 0.0000E + 00,
A6 = 1.9503 E-02, A7 = 0.0000 E + 00, A8 = 8.3480 E-04, A10 =-4.9068 E-03,
A12 = 2.4011E-03, A14 = -6.1203E-04, A16 = 9.0950E-05, A18 = -7.4581E-06,
A20 = 2.6142 E-07
Fifth side
K = -1.450, A3 = 0.0000E + 00, A4 = -1.0160E-03, A5 = 0.0000E + 00,
A6 = 4.0835E-03, A7 = 0.0000E + 00, A8 = -1.2125E-03, A10 = 2.0421E-04,
A12 = -1.6490E-05, A14 = 5.0560E-07, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Sixth face
K = −1.9.954, A3 = 0.0000E + 00, A4 = 1.7114E-02, A5 = 0.0000E + 00,
A6 = -6.2859E-03, A7 = 0.0000E + 00, A8 = 1.6752E-02, A10 = -1.3667E-02,
A12 = 5.8355E-03, A14 = -5.4258E-04, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Eighth side
K = 35.954, A3 = 0.0000E + 00, A4 = 8.4661E-04, A5 = 0.0000E + 00,
A6 = -3.2797E-03, A7 = 0.0000E + 00, A8 = 4.6050E-03, A10 = -6.5564E-04,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
9th surface
K = -0.485, A3 = 0.0000E + 00, A4 = -1.3434E-02, A5 = 0.0000E + 00,
A6 = 3.4984E-02, A7 = 0.0000E + 00, A8 = -1.6539E-02, A10 = 2.9138E-03,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Face 10
K = -1.579, A3 = 0.0000E + 00, A4 = -1.3202E-01, A5 = 0.0000E + 00,
A6 = 8.098 E-02, A7 = 0.0000 E + 00, A8 = -2.8289 E-02, A10 = 4.2125 E-03,
A12 = -1.6899E-04, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
11th
K = -3.272, A3 = 0.0000E + 00, A4 = -4.2411E-02, A5 = 0.0000E + 00,
A6 = 1.7833E-02, A7 = 0.0000E + 00, A8 = -2.5238E-03, A10 = -6.2600E-04,
A12 = 2.2990 E-04, A14 =-2. 1021 E-05, A16 = 0.0000 E + 00, A18 = 0.0000 E + 00,
A20 = 0.0000E + 00
12th
K = 1.767, A3 = 0.0000E + 00, A4 = 3.2863E-02, A5 = 0.0000E + 00,
A6 = -3.2693E-02, A7 = 0.0000E + 00, A8 = 1.4089E-02, A10 = -3.3373E-03,
A12 = 4.2143E-04, A14 = -2.2204E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
13th surface
K = -7.853, 0A3 = .0000E + 00, A4 = -5.0370E-02, A5 = 0.0000E + 00,
A6 = 1.9921 E-02, A7 = 0.0000 E + 00, A8 =-6.0639 E-03, A10 = 1.2533 E-03,
A12 = -1.6018E-04, A14 = 1.1544E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00

FIG. 6A is a cross-sectional view of the single-focus imaging optical system 10E and the like of the fifth embodiment. Specifically, the single-focus imaging optical system 10E includes, in order from the object side, a negative first lens L1, a negative second lens L2, a positive third lens L3, a stop (or an aperture stop) ST, and a positive third It consists essentially of a four lens L4, a negative fifth lens L5, and a positive sixth lens L6. Here, the first and fourth lenses L1 and L4 are made of glass, and the second, third, fifth and sixth lenses L2, L3, L5 and L6 are made of plastic. Between the sixth lens L6 and the solid-state imaging device 51, a parallel flat plate F of an appropriate thickness is disposed.

6B and 6C show longitudinal aberration diagrams (spherical aberration and astigmatism) of the single-focus imaging optical system 10E of Example 5. FIG.

In the single-focus imaging optical system 10E of Example 5, the amount of focus movement (normal temperature) of the plastic lens (specifically, the second, third, fifth, and sixth lenses L2, L3, L5, L6) due to temperature change The movement amount when changing from (25 ° C.) to 105 ° C. is 0.009 mm.

(Example 6)
The entire specifications of the single-focus imaging optical system of Example 6 are shown in Table 16 below.
[Table 16]
f (mm) 1.27
Fno 2.0
w (°) 110.0
ymax (mm) 2.64
TL (mm) 16.00
BF (mm) 2.07

The data of the lens surface of the single focus imaging optical system of Example 6 is shown in Table 17 below.
[Table 17]
Surf.N R (mm) d (mm) nd d d
1 14.150 1.40 1.80422 46.5
2 4.102 2.65
3 * -13.284 0.82 1.54537 56.1
4 * 1.482 1.28
5 * 3.410 2.70 1.63414 23.8
6 * -11.084 0.29
7 (ST) INF 0.25
8 * 4.230 1.53 1.49707 81.5
9 *-1.750 0.10
10 * 11.666 0.53 1.63414 23.8
11 * 1.445 0.22
12 * 4.636 1.92 1.54537 56.1
13 *-2.257 1.43
14 INF 0.70 1.51680 64.2
15 INF 0.18
image INF

The aspheric coefficients of the lens surface of the single focus imaging optical system of Example 6 are shown in Table 18 below.
[Table 18]
Third side
K = 6. 579, A3 = 6.4975E-04, A4 = 6.7423 E-03, A5 = 2.2214 E-04,
A6 = -1.4220E-03, A7 = 1.9470E-05, A8 = 3.7876E-04, A10 = -1.1713E-04,
A12 = 2.5771E-05, A14 = -3.5424E-06, A16 = 2.9004E-07, A18 = -1.2980E-08,
A20 = 2.4437E-10
Fourth side
K = -0.670, A3 = -1.5731E-02, A4 = 1.9560E-02, A5 = -2.0805E-02,
A6 = 6.9759 E-02, A7 = 3. 1993 E-03, A8 = -1.4333 E-01, A10 = 1.7498 E-01,
A12 = -1.2757E-01, A14 = 5.6619E-02, A16 = -1.5082E-02, A18 = 2.2492E-03,
A20 = -1.4727E-04
Fifth side
K = -6.494, A3 = 1.6669E-02, A4 = -1.2493E-02, A5 = 1.528E-02,
A6 = 7.5195E-03, A7 = -6.1190E-03, A8 = -2.7179E-03, A10 = 1.2896E-03,
A12 = 1.6865 E-04, A14 = -8.2402 E-05, A16 = 0.0000 E + 00, A18 = 0.0000 E + 00,
A20 = 0.0000E + 00
Sixth face
K = 50.000, A3 = 1.0915E-02, A4 = -3.5326E-02, A5 = 3.2086E-02,
A6 = 9.0935 E-03, A7 = -3.0279 E-02, A8 = 1.0125 E-02, A10 = 7.9541 E-03,
A12 = -4.9947E-03, A14 = 9.3447E-04, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Eighth side
K = 2.858, A3 = 0.0000E + 00, A4 = -1.6199E-02, A5 = 0.0000E + 00,
A6 = -6.5537E-03, A7 = 0.0000E + 00, A8 = 2.8076E-03, A10 = -6.5350E-04,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
9th surface
K = -2.419, A3 = 0.0000 E + 00, A4 =-3.5022 E-02, A5 = 0.0000 E + 00,
A6 = 3.9984E-02, A7 = 0.0000E + 00, A8 = -2.4908E-02, A10 = 5.6758E-03,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Face 10
K = 45.051, A3 = -6.6149 E-03, A4 = -1.8398 E-01, A5 =-2.6159 E-02,
A6 = 1.5133E-01, A7 = 4.4296E-03, A8 = -7.4396E-02, A10 = 2.1255E-02,
A12 = -2.5019E-03, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
11th
K = -5.266, A3 = 1. 1979 E-03, A4 = -3.6641 E-02, A5 = -6.7638 E-03,
A6 = 2.3594 E-02, A7 = 1.2222 E-03, A8 = -5.8581 E-03, A10 = 1.421 E-04,
A12 = 2.5236E-04, A14 = -4.4786E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
12th
K = 2.195, A3 = -3.7655E-03, A4 = 2.6364E-02, A5 = 1.0950E-03,
A6 = -2.7424E-02, A7 = -3.7578E-05, A8 = 1.2497E-02, A10 = -3.1019E-03,
A12 = 4.0391E-04, A14 = -2.1616E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
13th surface
K = -1.594, A3 = 1.8128E-02, A4 = -1.8119E-02, A5 = 3.9880E-03,
A6 = 2.913 E-03, A7 = -6.9970 E-04, A8 = 1.4922 E-03, A10 = -8.9053 E-04,
A12 = 2.4217E-04, A14 = -2.1167E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00

FIG. 7A is a cross-sectional view of the single-focus imaging optical system 10F and the like of the sixth embodiment. Specifically, the single-focus imaging optical system 10F includes, in order from the object side, a negative first lens L1, a negative second lens L2, a positive third lens L3, a stop (or an aperture stop) ST, and a positive third It consists essentially of a four lens L4, a negative fifth lens L5, and a positive sixth lens L6. Here, the first and fourth lenses L1 and L4 are made of glass, and the second, third, fifth and sixth lenses L2, L3, L5 and L6 are made of plastic. Between the sixth lens L6 and the solid-state imaging device 51, a parallel flat plate F of an appropriate thickness is disposed.

FIGS. 7B and 7C show longitudinal aberration diagrams (spherical aberration and astigmatism) of the single-focus imaging optical system 10F of Example 6. FIG.

In the single-focus imaging optical system 10F of Example 6, the amount of focus movement (normal temperature) of the plastic lenses (specifically, the second, third, fifth, and sixth lenses L2, L3, L5, L6) due to temperature change The movement amount when changing from (25 ° C.) to 105 ° C. is −0.009 mm.

(Example 7)
Table 19 below shows the overall specifications of the single-focus imaging optical system of Example 7.
[Table 19]
f (mm) 1.07
Fno 2.0
w (°) 110.0
ymax (mm) 2.64
TL (mm) 16.13
BF (mm) 2.06

The data of the lens surface of the single focus imaging optical system of Example 7 are shown in Table 20 below.
[Table 20]
Surf.N R (mm) d (mm) nd d d
1 14.125 1.42 1.80422 46.5
2 4.144 2.69
3 *-13.595 1.01 1.54537 56.1
4 * 1.640 1.31
5 * 4.216 2.70 1.63414 23.8
6 *-27.384 0.16
7 (ST) INF 0.19
8 * 4.608 1.61 1.49707 81.5
9 *-1.583 0.10
10 * 11.574 0.51 1.63414 23.8
11 * 1.456 0.22
12 * 4.561 1.92 1.54537 56.1
13 * -1.771 1.45
14 INF 0.70 1.51680 64.2
15 INF 0.15
image INF

The data of the lens surface of the single focus imaging optical system of Example 7 are shown in Table 21 below.
[Table 21]
Third side
K = 7.158, A3 = 7.3834E-04, A4 = 6.7154E-03, A5 = 2.0025E-04,
A6 = -1.4309E-03, A7 = 1.6688E-05, A8 = 3.7828E-04, A10 = -1.1705E-04,
A12 = 2.5776E-05, A14 = -3.5417E-06, A16 = 2.9006E-07, A18 = -1.2982E-08,
A20 = 2.4376 E-10
Fourth side
K = -0.689, A3 = -2.4056E-02, A4 = 1.7165E-02, A5 = -2.1175E-02,
A6 = 6.9920E-02, A7 = 3.4129E-03, A8 = -1.4319E-01, A10 = 1.7501E-01,
A12 = -1.2757E-01, A14 = 5.6617E-02, A16 = -1.5083E-02, A18 = 2.2492E-03,
A20 = -1.4706E-04
Fifth side
K = -7.053, A3 = 1.6840E-02, A4 = -1.2165E-02, A5 = 1.3055E-02,
A6 = 8.1724E-03, A7 = -5.5198E-03, A8 =-2.2639E-03, A10 = 1.4295E-03,
A12 = 1.7306E-04, A14 = -1.0871E-04, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Sixth face
K = 50.000, A3 = 1.5247E-02, A4 = -2.9329E-02, A5 = 3.8947E-02,
A6 = 1.4564E-02, A7 = -2.5513E-02, A8 = 2.8903E-03, A10 = 6.4435E-03,
A12 = 6.7087E-03, A14 = -1.3860E-02, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Eighth side
K = 6.087, A3 = 0.0000E + 00, A4 = -1.5232E-02, A5 = 0.0000E + 00,
A6 = -9.0436E-03, A7 = 0.0000E + 00, A8 = 9.5526E-03, A10 = -2.4041E-03,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
9th surface
K = -1.982, A3 = 0.0000E + 00, A4 = -3.9632E-02, A5 = 0.0000E + 00,
A6 = 3.2304 E-02, A7 = 0.0000 E + 00, A8 =-2.4628 E-02, A10 = 6.7747 E-03,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Face 10
K = 49.657, A3 = -8.2791E-03, A4 = -1.8283E-01, A5 = -2.5925E-02,
A6 = 1.5079E-01, A7 = 5.0445E-03, A8 = -7.4581E-02, A10 = 2.0868E-02,
A12 = -2.3734E-03, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
11th
K = -5.465, A3 = 3.3463 E-03, A4 = -3.5408 E-02, A5 = -6.0857 E-03,
A6 = 2.3687E-02, A7 = 1.0441E-03, A8 = -5.9928E-03, A10 = 1.6147E-04,
A12 = 2.6892E-04, A14 = -4.3189E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
12th
K = 2.539, A3 = -1.9652E-03, A4 = 2.7659E-02, A5 = 1.4953E-03,
A6 = -2.7396E-02, A7 = -3.1694E-04, A8 = 1.2428E-02, A10 = -3.1115E-03,
A12 = 4.0456E-04, A14 = -2.0988E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
13th surface
K = -1.702, A3 = 2.4906E-02, A4 = -1.7199E-02, A5 = 4.5703E-03,
A6 = 2.5241 E-03, A7 = -5.3121 E-04, A8 = 1.5726 E-03, A10 =-8.7 597 E-04,
A12 = 2.4187E-04, A14 = -2.3913E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00

FIG. 8A is a cross-sectional view of a single focus imaging optical system 10G and the like according to a seventh example. Specifically, the single-focus imaging optical system 10G includes, in order from the object side, a negative first lens L1, a negative second lens L2, a positive third lens L3, a stop (or an aperture stop) ST, and a positive third It consists essentially of a four lens L4, a negative fifth lens L5, and a positive sixth lens L6. Here, the first and fourth lenses L1 and L4 are made of glass, and the second, third, fifth and sixth lenses L2, L3, L5 and L6 are made of plastic. Between the sixth lens L6 and the solid-state imaging device 51, a parallel flat plate F of an appropriate thickness is disposed.

8B and 8C show longitudinal aberration diagrams (spherical aberration and astigmatism) of the single-focus imaging optical system 10G of Example 7. FIG.

In the single-focus imaging optical system 10G of Example 7, the amount of focus movement (normal temperature) of the plastic lenses (specifically, the second, third, fifth, and sixth lenses L2, L3, L5, L6) due to the temperature change The movement amount when changing from (25 ° C.) to 105 ° C. is −0.009 mm.

(Example 8)
Table 22 below shows the overall specifications of the single-focus imaging optical system of Example 8.
[Table 22]
f (mm) 1.24
Fno 2.0
w (°) 110.0
ymax (mm) 2.65
TL (mm) 16.56
BF (mm) 2.13

Data of the lens surface of the single focus imaging optical system of Example 8 are shown in Table 23 below.
[Table 23]
Surf.N R (mm) d (mm) nd d d
1 13.418 1.32 1.80422 46.5
2 4.702 3.19
3 * -12.487 0.72 1.54537 56.1
4 * 1.162 1.32
5 * 2.749 2.70 1.63414 23.8
6 * -100.000 0.17
7 (ST) INF 0.19
8 * 3.798 1.65 1.49707 81.5
9 *-1.816 0.10
10 * 20.577 0.50 1.63414 23.8
11 * 1.784 0.19
12 * 4.634 2.15 1.54537 56.1
13 *-2.444 1.44
14 INF 0.70 1.51680 64.2
15 INF 0.23
image INF

The data of the lens surface of the single focus imaging optical system of Example 8 are shown in Table 24 below.
[Table 24]
Third side
K = 7.017, A3 = 5.7919 E-04, A4 = 6.7082 E-03, A5 = 2. 1047 E-04,
A6 = -1.4269E-03, A7 = 1.7778E-05, A8 = 3.7834E-04, A10 = -1.1698E-04,
A12 = 2.5788E-05, A14 = -3.5416E-06, A16 = 2.8993E-07, A18 = -1.3000E-08,
A20 = 2.4611 E-10
Fourth side
K = -0.713, A3 = -3.5889E-02, A4 = 1.4728 E-02, A5 = -2.3360E-02,
A6 = 6.8572E-02, A7 = 2.6735E-03, A8 = -1.4350E-01, A10 = 1.7502E-01,
A12 = -1.2755E-01, A14 = 5.6620E-02, A16 = -1.5084E-02, A18 = 2.2485E-03,
A20 = -1.4695E-04
Fifth side
K = -3.774, A3 = 1.0295E-02, A4 = -9.7277E-03, A5 = 1.3521E-02,
A6 = 7.2958 E-03, A7 = -6.0377 E-03, A8 =-2.4540 E-03, A10 = 1.3919 E-03,
A12 = 1.3304E-04, A14 = -7.5736E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Sixth face
K = 50.000, A3 = 1.1510E-02, A4 = -3.4966E-02, A5 = 3.6406E-02,
A6 = 1.3446E-02, A7 = -2.9067E-02, A8 = 6.3956E-03, A10 = 3.6388E-03,
A12 = 8.2252E-03, A14 = -5.5157E-03, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Eighth side
K = 3.959, A3 = 0.0000E + 00, A4 = -1.4884E-02, A5 = 0.0000E + 00,
A6 = 1.8110E-03, A7 = 0.0000E + 00, A8 = 2.3045E-03, A10 = -1.1241E-03,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
9th surface
K = −1.398, A3 = 0.0000E + 00, A4 = −4.2153E-02, A5 = 0.0000E + 00,
A6 = 4.4877E-02, A7 = 0.0000E + 00, A8 = -2.5818E-02, A10 = 6.2878E-03,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Face 10
K = 7.820, A3 = 1.2785 E-02, A4 =-1.8787 E-01, A5 =-3.2084 E-02,
A6 = 1.4737 E-01, A7 = 1.9645 E-03, A8 = -7.5871 E-02, A10 = 2.1014 E-02,
A12 = -2.0402E-03, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
11th
K = -4.916, A3 = 8.4659E-05, A4 = -3.6431 E-02, A5 = -7.2906E-03,
A6 = 2.3027E-02, A7 = 9.0030E-04, A8 = -5.9835E-03, A10 = 1.4559E-04,
A12 = 2.4641E-04, A14 = -3.8138E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
12th
K = 2.018, A3 = -2.3330 E-03, A4 = 2.6362 E-02, A5 = 9.9768 E-04,
A6 = -2.7589E-02, A7 = -1.7034E-04, A8 = 1.2436E-02, A10 = -3.0927E-03,
A12 = 4.1095E-04, A14 = -2.2867E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
13th surface
K = -1.594, A3 = 1.2997E-02, A4 = -1.8900E-02, A5 = 3.1613E-03,
A6 = 1.7400E-03, A7 = -8.7963E-04, A8 = 1.4297E-03, A10 = -8.9773E-04,
A12 = 2.4196E-04, A14 = -2.0355E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00

FIG. 9A is a cross-sectional view of a single focus imaging optical system 10H and the like according to an eighth embodiment. Specifically, the single-focus imaging optical system 10H includes, in order from the object side, a negative first lens L1, a negative second lens L2, a positive third lens L3, a stop (or an aperture stop) ST, and a positive third It consists essentially of a four lens L4, a negative fifth lens L5, and a positive sixth lens L6. Here, the first and fourth lenses L1 and L4 are made of glass, and the second, third, fifth and sixth lenses L2, L3, L5 and L6 are made of plastic. Between the sixth lens L6 and the solid-state imaging device 51, a parallel flat plate F of an appropriate thickness is disposed.

9B and 9C show longitudinal aberration diagrams (spherical aberration and astigmatism) of the single-focus imaging optical system 10H of Example 8. FIG.

In the single-focus imaging optical system 10H of Example 8, the amount of focus movement (normal temperature) of the plastic lenses (specifically, the second, third, fifth, and sixth lenses L2, L3, L5, L6) due to the temperature change The movement amount when changing from (25 ° C.) to 105 ° C. is −0.010 mm.

(Example 9)
Table 25 below shows the overall specifications of the single-focus imaging optical system of Example 9.
[Table 25]
f (mm) 1.33
Fno 2.0
w (°) 110.0
ymax (mm) 2.65
TL (mm) 15.98
BF (mm) 2.16

Data of the lens surface of the single focus imaging optical system of Example 9 are shown in Table 26 below.
[Table 26]
Surf.N R (mm) d (mm) nd d d
1 14.041 1.40 1.80422 46.5
2 4.133 2.68
3 * -13.451 0.72 1.54537 56.1
4 * 1.563 1.36
5 * 3.498 2.70 1.63414 23.8
6 * -9.793 0.24
7 (ST) INF 0.19
8 * 4.602 1.51 1.49707 81.5
9 * -1.611 0.10
10 * 18.420 0.50 1.63414 23.8
11 * 1.358 0.23
12 * 4.622 1.94 1.54537 56.1
13 *-2.200 1.49
14 INF 0.70 1.51680 64.2
15 INF 0.21
image INF

Data of the lens surface of the single focus imaging optical system of Example 9 is shown in Table 27 below.
[Table 27]
Third side
K = 6.221, A3 = 7.3013E-04, A4 = 6.7925 E-03, A5 = 2.3405 E-04,
A6 = -1.4211E-03, A7 = 1.9111E-05, A8 = 3.7838E-04, A10 = -1.1718E-04,
A12 = 2.5769E-05, A14 = -3.5421E-06, A16 = 2.9008E-07, A18 = -1.2979E-08,
A20 = 2.4388 E-10
Fourth side
K = -0.658, A3 = -5.2209E-03, A4 = 2.0854E-02, A5 = -2.0642E-02,
A6 = 6.9791 E-02, A7 = 3.1455 E-03, A8 = -1.4333 E-01, A10 = 1.7499 E-01,
A12 = -1.2758 E-01, A14 = 5.6613 E-02, A16 = -1.5085 E-02, A18 = 2.2487 E-03,
A20 = -1.4685E-04
Fifth side
K = -5.620, A3 = 1.5442 E-02, A4 = -1.2406 E-02, A5 = 1.1971 E-02,
A6 = 7.0014E-03, A7 = -6.3827E-03, A8 = -2.7543E-03, A10 = 1.3501E-03,
A12 = 1.7973E-04, A14 = -9.3478E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Sixth face
K = 50.000, A3 = 1.0652E-02, A4 = -3.4728E-02, A5 = 3.2590E-02,
A6 = 9.5929E-03, A7 = -2.9992E-02, A8 = 1.0113E-02, A10 = 7.6351E-03,
A12 = -4.7981 E-03, A14 = 1.2353 E-03, A16 = 0.0000 E + 00, A18 = 0.0000 E + 00,
A20 = 0.0000E + 00
Eighth side
K = 3.488, A3 = 0.0000E + 00, A4 = -1.5265E-02, A5 = 0.0000E + 00,
A6 = -4.9879E-03, A7 = 0.0000E + 00, A8 = 1.5319E-03, A10 = -5.6578E-04,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
9th surface
K = -2.914, A3 = 0.0000E + 00, A4 = -3.3676E-02, A5 = 0.0000E + 00,
A6 = 3.7133E-02, A7 = 0.0000E + 00, A8 = -2.5632E-02, A10 = 6.2236E-03,
A12 = 0.0000E + 00, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
Face 10
K = 19.602, A3 = -5.9653 E-03, A4 = -1.8697 E-01, A5 = -2.6983 E-02,
A6 = 1.5132E-01, A7 = 4.5507E-03, A8 = -7.4239E-02, A10 = 2.1448E-02,
A12 = -2.4078E-03, A14 = 0.0000E + 00, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
11th
K = -5.322, A3 = -2.0360E-04, A4 = -3.7114E-02, A5 = -6.9115E-03,
A6 = 2.3592 E-02, A7 = 1.2559 E-03, A8 = -5.8416 E-03, A10 = 1.6498 E-04,
A12 = 2.4463 E-04, A14 = -4.1757 E-05, A16 = 0.0000 E + 00, A18 = 0.0000 E + 00,
A20 = 0.0000E + 00
12th
K = 2.101, A3 = -4.1546E-03, A4 = 2.690E-02, A5 = 1.0482E-03,
A6 = -2.7428E-02, A7 = -4.9701E-05, A8 = 1.2484E-02, A10 = -3.1061E-03,
A12 = 4.0373E-04, A14 = -2.1326E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00
13th surface
K = -1.415, A3 = 1.2862 E-02, A4 = -1.9037 E-02, A5 = 3.7960 E-03,
A6 = 2.1670E-03, A7 = -6.8386E-04, A8 = 1.5108E-03, A10 = -8.8421E-04,
A12 = 2.4270E-04, A14 = -2.1598E-05, A16 = 0.0000E + 00, A18 = 0.0000E + 00,
A20 = 0.0000E + 00

FIG. 10A is a cross-sectional view of a single focus imaging optical system 10I and the like according to a ninth example. Specifically, the single-focus imaging optical system 10I includes, in order from the object side, a negative first lens L1, a negative second lens L2, a positive third lens L3, a stop (or an aperture stop) ST, and a positive third It consists essentially of a four lens L4, a negative fifth lens L5, and a positive sixth lens L6. Here, the first and fourth lenses L1 and L4 are made of glass, and the second, third, fifth and sixth lenses L2, L3, L5 and L6 are made of plastic. Between the sixth lens L6 and the solid-state imaging device 51, a parallel flat plate F of an appropriate thickness is disposed.

10B and 10C show longitudinal aberration diagrams (spherical aberration and astigmatism) of the single-focus imaging optical system 10I of Example 9. FIG.

In the single-focus imaging optical system 10I of Example 9, the amount of focus movement (normal temperature due to temperature change of the plastic lenses (specifically, the second, third, fifth, and sixth lenses L2, L3, L5, L6) The movement amount when changing from (25 ° C.) to 105 ° C. is −0.012 mm.

Table 28 below summarizes the values of Examples 1 to 9 corresponding to the conditional expressions (1) to (10) for reference.
[Table 28]

The single-focus imaging optical system according to the embodiment has been described above, but the single-focus imaging optical system according to the present invention is not limited to the above-described one. For example, in the above embodiment, a lens or the like having substantially no refractive power can be added between the first to sixth lenses L1 to L6, or the image side or the object side thereof.

Further, in the above embodiment, with regard to the parallel flat plate F, when imaging with visible light or near-infrared light in applications such as a car-mounted camera or a surveillance camera, the filter that is a parallel flat plate is divided into two It is also possible to take a configuration such as giving the role of

Claims (14)

1. From the object side,
   A first lens having negative refractive power;
   A biconcave second lens,
   A biconvex third lens,
   With the aperture,
   A fourth lens having a positive refractive power,
   A negative fifth lens having a convex object side surface in a paraxial region,
   A sixth lens having positive refractive power;
   A single focus imaging optical system consisting essentially of:
2. The single focus imaging optical system according to claim 1, which satisfies the following conditional expression.
   0.1 <(d34 / f) / (tan (w / 2)) <0.8 (1)
   d34: distance f between the third lens and the fourth lens f: focal length of the whole system w: maximum half angle of view
3. The single focus imaging optical system according to any one of claims 1 and 2, which satisfies the following conditional expression.
   -3 ≦ f2 / f ≦ -1 (2)
   f2: focal length of the second lens f: focal length of the whole system
4. The single focus imaging optical system according to any one of claims 1 to 3, which satisfies the following conditional expression.
   3 ≦ f3 / f ≦ 6 (3)
   f3: focal length of the third lens f: focal length of the whole system
5. The single focus imaging optical system according to any one of claims 1 to 4, which satisfies the following conditional expression.
   -3 ≦ f5 / f ≦ -1 (4)
   f5: focal length of the fifth lens f: focal length of the whole system
6. The single focus imaging optical system according to any one of claims 1 to 5, which satisfies the following conditional expression.
   2 ≦ f1 / f2 ≦ 5.5 (5)
   f1: focal length of the first lens f2: focal length of the second lens
7. The single focus imaging optical system according to any one of claims 1 to 6, which satisfies the following conditional expression.
   −8 ≦ f1 / f ≦ −5 (6)
   f1: focal length of the first lens f: focal length of the whole system
8. The single focus imaging optical system according to any one of claims 1 to 7, which satisfies the following conditional expression.
   1.5 ≦ f4 / f ≦ 3 (7)
   f4: focal length of the fourth lens f: focal length of the whole system
9. The single focus imaging optical system according to any one of claims 1 to 8, wherein the second, third, fifth and sixth lenses are made of plastic and satisfy the following conditional expression.
   −0.4 ≦ f × Σ (1 / fplk) ≦ −0.2 (8)
   fplk: focal length f of the k-th plastic lens from the object side f: focal length of the entire system
10. The single focus imaging optical system according to any one of claims 1 to 9, which satisfies the following conditional expression.
    L L 4 65 65 (9)
    L L4: Abbe number of the fourth lens
11. The single focus imaging optical system according to any one of claims 1 to 10, which satisfies the following conditional expression.
    1.8 ≦ nL1 (10)
    nL1: refractive index of the first lens
12. A single focus imaging optical system according to any one of claims 1 to 11,
    A lens barrel that holds the single focus imaging optical system;
    A lens unit provided with
13. A single focus imaging optical system according to any one of claims 1 to 11,
    An imaging device for detecting an image obtained from the single focus imaging optical system;
    An imaging device comprising:
14. The imaging device according to claim 13, comprising a lens barrel that holds the single focus imaging optical system.

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