CN103777315A

CN103777315A - Miniaturized wide angle imaging lens

Info

Publication number: CN103777315A
Application number: CN201310572001.9A
Authority: CN
Inventors: 黄林; 戴付建
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2013-11-15
Filing date: 2013-11-15
Publication date: 2014-05-07
Anticipated expiration: 2033-11-15
Also published as: CN103777315B

Abstract

The invention provides a miniaturized wide angle imaging lens. The miniaturized wide angle imaging lens comprises successively a first lens, a second lens and a third lens from an object side to an image side, wherein the first lens is a lens with negative focal power; the second lens is a crescent-shaped lens which has negative focal power and has an object side provided with a convex surface; the first lens is a lens with positive focal power; and the imaging lens satisfies the following condition: -2.6<f12/f13<-1.6, wherein f12 is a combination focal length of the first lens and the second lens, and f13 is the focal length of the third lens. According to the invention, three pieces of plastic aspheric lenses are employed, through different focal power distribution, the disadvantages in the prior art are overcome, and a new solution scheme is provided for conventional specification requirements and performance requirements.

Description

Miniature wide-angle imaging lens

Technical field

The present invention relates to a kind of imaging optical system being formed by three groups of lens, especially relate to a kind of miniature wide-angle imaging lens that can be applicable near infrared imaging.

Background technology

In recent years, along with the development of the chip technology such as CCD or CMOS, the Pixel Dimensions of chip was more and more less, drove pick-up lens gradually toward miniaturization, lightweight and the development of high pixel field.And, in pursuing the high picture element of miniaturization, also further require to provide the performance such as wide-angle and large aperture.For above-mentioned requirements, the patent No. is " US7751128 ", within open day, is the patent of invention of " 2010.07.06 ", proposed a kind of wide-angle camera of 3 chip architectures.Three groups of lens in this camera lens from the object side to the image side successively by thering is negative dioptric first lens, the 3rd lens that have the second lens of positive diopter and have a positive diopter form.Although this system has been taken into account the characteristic of wide-angle, limit to some extent for the pursuit of miniaturization, and its wide-angleization is also insufficient.And this system has been used glass as the material of first lens, improve the manufacturing cost of camera lens, the space being therefore improved.

In addition, along with the range of application of pick-up lens is more and more extensive, particularly in industries such as mobile phone camera, on-vehicle lens, safe imaging monitoring and electronic entertainment, use the demand of the phtographic lens of infrared ray wave band also to improve, the lens that conventional being only designed for receives visible ray cannot satisfy the demands thereupon.Thus, the present invention proposes a kind of wide-angle imaging lens with larger field angle, can effectively shorten the total length of system, reduces the susceptibility of system, to obtain good image quality, can be applicable to infrared optical system field simultaneously.

Summary of the invention

The invention provides a kind of miniature wide-angle imaging lens, solved there is high pixel, image quality is good but shortcoming that camera lens is not portable, applicable to portable type electronic product, its technical scheme is as described below:

A kind of miniature wide-angle imaging lens, comprises first lens, the second lens, the 3rd lens, the eyeglass that described first lens is negative power successively from object space to image space; The second lens are the falcate eyeglass that the object side of positive light coke is convex surface; The eyeglass that the 3rd lens are positive light coke; Described camera lens meets

-2.6<f12/f3<-1.6

Wherein, f12 is the combined focal length of first lens and the second lens; F3 is the focal length of the 3rd lens.

Further, described camera lens meets

0.75<Y’/(f*TTL)<5.0

Wherein, Y ' is the maximum image height on imaging surface; F is the focal length of whole lens combination; TTL is the overall length of lens.

Wherein, to have a face at least be aspheric surface to this lens system.

Further, between the second lens and the 3rd lens, be provided with diaphragm.

The present invention has adopted 3 plastic aspherical element eyeglasses, distributes by different focal powers, has overcome the defect of prior art, and current specification requirement and performance requirement have been proposed to a kind of new solution.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of miniature wide-angle imaging lens embodiment 1 provided by the invention;

Fig. 2 is chromaticity difference diagram (mm) on the axle of embodiment 1;

Fig. 3 is the astigmatism figure (mm) of embodiment 1;

Fig. 4 is the distortion figure (%) of embodiment 1;

Fig. 5 is that (μ m) for the ratio chromatism, figure of embodiment 1;

Fig. 6 is the schematic diagram of miniature wide-angle imaging lens embodiment 2 provided by the invention;

Fig. 7 is chromaticity difference diagram (mm) on the axle of embodiment 2;

Fig. 8 is the astigmatism figure (mm) of embodiment 2;

Fig. 9 is the distortion figure (%) of embodiment 2;

Figure 10 is that (μ m) for the ratio chromatism, figure of embodiment 2;

Figure 11 is the schematic diagram of miniature wide-angle imaging lens embodiment 3 provided by the invention;

Figure 12 is chromaticity difference diagram (mm) on the axle of embodiment 3;

Figure 13 is the astigmatism figure (mm) of embodiment 3;

Figure 14 is the distortion figure (%) of embodiment 3;

Figure 15 is that (μ m) for the ratio chromatism, figure of embodiment 3.

Embodiment

In embodiment 1, as Fig. 1 the present invention is made up of three groups of lens, comprise successively first lens E1, the second lens E2, diaphragm, the 3rd lens E3, color filter E4, optical glass, the eyeglass that described first lens E1 is negative power from object space to image space; The falcate eyeglass that the object side that the second lens E2 is positive light coke is convex surface; The eyeglass that the 3rd lens E3 is positive light coke; It is aspheric surface that this system has a face at least; From the object side to the image side, described first lens E1 two sides is S1, S2, and the second lens E2 two sides is S3, S4, and diaphragm face is S5, and the 3rd lens E3 two sides is S6, S7, and color filter E4 two sides is S8, S9, and the face of optical lens is S10.

The parameter of camera lens meets:

TTL=7.004；f1=-1.798；f2=10.810；f3=1.585；f=0.781；

f12/f3=-1.686；

Y’/(f*TTL)=0.877；

Systematic parameter: 1/4 " sensor devices f-number 2.0

Table 1

Surface type	Radius-of-curvature	Thickness	Material	Effective diameter	Circular cone coefficient
						Sphere	Infinite	Infinite	?	?	?
Aspheric surface	9.7060	0.5921	1.535/55.78	8.7371	3.0890
						Aspheric surface	0.8459	1.9918	?	3.8110	-1.1382
Aspheric surface	3.5491	0.5163	1.535/55.78	2.5620	-119.2531
						Aspheric surface	8.9237	0.1854	?	1.5392	-80.6538
Sphere	Infinite	0.1794	?	0.8748	?
						Aspheric surface	5.0750	1.3925	1.535/55.78	2.6017	-155.9082
Aspheric surface	-0.9061	0.1000	?	3.0083	-1.0020
						Sphere	Infinite	0.7000	1.517/64.17	3.7065	?
Sphere	Infinite	1.3469	?	4.0309	?
						Sphere	Infinite	?	?	5.0072	?

Following table is aspheric surface high-order term coefficient A4, A6, A8, A10, A12, A14, the A16 of non-spherical lens:

Table 2

A4

A6

A8

A10

A12

A14

A16

2.5562E-04

1.7819E-05

-7.0637E-08

-1.5991E-08

2.2154E-10

-9.2277E-12

2.0617E-12

-2.9628E-03

1.3353E-03

1.4503E-04

2.4303E-05

8.8328E-06

6.6284E-07

-7.6055E-07

-1.6192E-02

2.3634E-02

5.0702E-03

-2.3389E-03

-2.6233E-03

4.6618E-04

2.1308E-04

-5.2842E-03

2.9720E-01

-9.7431E-02

-1.1110E-01

-2.2248E-01

2.4343E-01

1.1038E-01

6.7334E-02

-2.1195E-02

-2.4822E-03

4.2523E-03

6.5941E-04

1.6267E-05

-6.1539E-04

2.2635E-02

1.6945E-02

3.0618E-03

2.4526E-03

8.0688E-04

7.0922E-05

-4.1344E-04

In embodiment bis-, as shown in Figure 6, described camera lens comprises first lens E1, the second lens E2, diaphragm, the 3rd lens E3, color filter E4, optical glass, the eyeglass that described first lens E1 is negative power successively from object space to image space; The falcate eyeglass that the object side that the second lens E2 is positive light coke is convex surface; The eyeglass that the 3rd lens E3 is positive light coke; It is aspheric surface that this system has a face at least; From the object side to the image side, described first lens E1 two sides is S1, S2, and the second lens E2 two sides is S3, S4, and diaphragm face is S5, and the 3rd lens E3 two sides is S6, S7, and color filter E4 two sides is S8, S9, and the face of optical lens is S10, and the parameter of camera lens is as follows:

TTL=2.50；f1=-0.714；f2=1.333；f3=0.771；f=0.676；

f12/f3=-2.438；

Y’/(f*TTL)=1.449；

Systematic parameter: 1/7 " sensor devices f-number 2.1

Table 3

Surface type	Radius-of-curvature	Thickness	Material	Effective diameter	Circular cone coefficient
						Sphere	Infinite	400.0000	?	2489.7543	?
Aspheric surface	6.5900	0.2000	1.535/55.78	2.0368	21.2093
						Aspheric surface	0.3526	0.1555	?	1.3271	-1.5943
Aspheric surface	0.6074	0.2850	1.535/55.78	1.2308	-8.6981
						Aspheric surface	3.7318	0.0664	?	0.6960	-117.0495
Sphere	Infinite	0.0896	?	0.4210	?
						Aspheric surface	7.3061	0.5780	1.535/55.78	1.0272	5.4632
Aspheric surface	-0.4191	0.0500	?	1.2148	-2.3577
						Sphere	Infinite	0.3000	1.517/64.17	1.6229	?
Sphere	Infinite	0.7758	?	1.8197	?
						Sphere	Infinite	?	?	2.5973	?

Table 4

A4

A6

A8

A10

A12

A14

A16

1.3898E-01

-5.2540E-02

1.8941E-02

-6.2563E-03

-1.0621E-02

-1.4494E-02

3.7631E-05

-4.9411E-01

-8.3334E-01

-8.7508E-01

2.8374E-01

3.9272E+00

7.0896E+00

-1.1196E+01

-9.2959E-01

1.9889E+00

3.5533E+00

3.3022E+00

-1.6052E+01

-3.4971E+01

2.2227E+01

7.0054E-01

4.7909E-01

1.6849E+02

-1.0475E+03

1.4855E+03

1.4069E+05

-8.8941E+05

2.6288E-01

1.8347E+00

-1.0646E+01

2.7701E+01

7.3977E+01

-5.9215E+02

9.3361E+02

-2.2051E+00

4.3358E+00

2.2159E-01

1.9109E+00

2.4826E+01

2.9384E+01

-1.9285E+02

In embodiment tri-, as described in Figure 11, described camera lens comprises first lens E1, the second lens E2, diaphragm, the 3rd lens E3, color filter E4, optical glass, the eyeglass that described first lens E1 is negative power successively from object space to image space; The falcate eyeglass that the object side that the second lens E2 is positive light coke is convex surface; The eyeglass that the 3rd lens E3 is positive light coke; It is aspheric surface that this system has a face at least; From the object side to the image side, described first lens E1 two sides is S1, S2, and the second lens E2 two sides is S3, S4, and diaphragm face is S5, and the 3rd lens E3 two sides is S6, S7, and color filter E4 two sides is S8, S9, and the face of optical lens is S10, and the parameter of described camera lens is as follows:

TTL=4.856；f1=-1.225；f2=2.585；f3=1.340；f=1.026；

f12/f3=-2.181；

Y’/(f*TTL)=0.964；

Systematic parameter: 1/4 " sensor devices f-number 2.1

Table 5

Surface type	Radius-of-curvature	Thickness	Material	Effective diameter	Circular cone coefficient
						Sphere	Infinite	Infinite	?	?	?
Aspheric surface	12.4627	0.2990	1.535/55.78	3.8755	7.7823
						Aspheric surface	0.6092	0.3839	?	2.6545	-1.6766
Aspheric surface	1.1605	0.6772	1.535/55.78	2.3407	-7.3876
						Aspheric surface	6.2151	0.0916	?	1.1415	40.5849
Sphere	Infinite	0.1460	?	0.7011	0.0000
						Aspheric surface	6.9177	1.2974	1.535/55.78	1.9828	18.9419
Aspheric surface	-0.7362	0.1000	?	2.3899	-2.4814
						Sphere	Infinite	0.7000	1.517/64.17	3.1734	?
Sphere	Infinite	1.1609	?	3.6336	?
						Sphere	Infinite	?	?	4.7829	?

Table 6

A4

A6

A8

A10

A12

A14

A16

1.8578E-02

-2.9866E-03

3.3076E-04

-9.6673E-06

-1.0207E-05

-3.6869E-06

2.6047E-07

-7.8851E-02

-3.5388E-02

-9.6417E-03

2.0662E-03

4.7566E-03

2.5677E-03

-1.5920E-03

-1.4032E-01

7.2103E-02

2.8731E-02

7.4159E-03

-2.2693E-02

-9.0772E-03

8.7628E-03

1.1012E-01

2.1934E-02

2.2467E+00

-4.0683E+00

1.6803E+00

4.6350E+01

-8.5345E+01

5.0587E-02

1.0486E-01

-2.0006E-01

1.1619E-01

1.1198E-01

-1.8380E-01

6.4093E-02

-3.4661E-01

1.9850E-01

2.9547E-03

7.4212E-03

2.8082E-02

9.6809E-03

-1.8505E-02

Fig. 2, Fig. 3, Fig. 4 and Fig. 5 are chromaticity difference diagram on the axle of embodiment 1, astigmatism figure, distortion figure and ratio chromatism, figure, Fig. 7, Fig. 8, Fig. 9 and Figure 10 are chromaticity difference diagram on the axle of embodiment 2, astigmatism figure, distortion figure and ratio chromatism, figure, Figure 12, Figure 13, Figure 14 and Figure 15 are chromaticity difference diagram on the axle of embodiment 3, astigmatism figure, distortion figure and ratio chromatism, figure, by chromaticity difference diagram, astigmatism figure, distortion figure and ratio chromatism, figure on the axle of each embodiment, can find out that the present invention has good optical property.

Although described principle of the present invention and embodiment for miniature wide-angle imaging lens above; but under above-mentioned instruction of the present invention; those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment, and these improvement or distortion all drop in protection scope of the present invention.It will be understood by those skilled in the art that specific descriptions are above in order to explain object of the present invention, and not for limiting the present invention, protection scope of the present invention is limited by claim and equivalent thereof.

Claims

1. a miniature wide-angle imaging lens, is characterized in that: comprise successively first lens, the second lens, the 3rd lens, the eyeglass that described first lens is negative power from object space to image space; The second lens are the falcate eyeglass that the object side of positive light coke is convex surface; The eyeglass that the 3rd lens are positive light coke; Described camera lens meets

-2.6<f12/f3<-1.6

2. miniature wide-angle imaging lens according to claim 1, is characterized in that: described camera lens meets

0.75<Y’/(f*TTL)<5.0

3. miniature wide-angle imaging lens according to claim 1, is characterized in that: it is aspheric surface that this lens system has a face at least.

4. miniature wide-angle imaging lens according to claim 1, is characterized in that: between the second lens and the 3rd lens, be provided with diaphragm.