CN204731476U

CN204731476U - Camera

Info

Publication number: CN204731476U
Application number: CN201520276491.2U
Authority: CN
Inventors: 张慧燕; 张岩峰; 尧群富; 覃道发
Original assignee: 深圳市霸王贝思特光学有限公司
Current assignee: Zhejiang Nalan Optical Technology Co Ltd
Priority date: 2015-04-30
Filing date: 2015-04-30
Publication date: 2015-10-28
Anticipated expiration: 2025-04-30

Abstract

The utility model relates to a kind of camera, comprises being arranged in order by thing side to image side: the first lens, and it is positive lens, have low-refraction; Second lens, it is negative lens, has high index of refraction; 3rd lens, it is positive lens, has low-refraction; 4th lens, it is negative lens, has low-refraction; The diaphragm of described camera is before described first lens.Compared with prior art, four lens type structures that the utility model adopts " Negative-Positive-Negative-negative ", and these four camera lenses adopt the combination of refractive indices of " low-Gao-low-low ", under the condition meeting extremely short optics overall length, effectively reduce all kinds of aberration, especially extraordinary rectification has been carried out to transverse direction and longitudianal aberration.

Description

Camera

Technical field

The utility model relates to a kind of camera.

Background technology

Along with developing rapidly of smart mobile phone is universal, the research and development of camera and design develop rapidly thereupon, especially at nearly 2 years, along with the appearance of high-end intelligent machine, have become camera quality the important indicator that is based oneself upon market.Traditional high-resolution camera (more than eight mega pixels) is generally made up of 5 lens, minority adopts 4 lens compositions, for realizing Large visual angle and short TTL, meet the requirement of the little F number of customer requirement simultaneously, reduce the spherical aberration of camera lens, coma, astigmatism, the curvature of field, distortion and aberration extremely important.

Based on the manufacturing tolerance of prior art, especially eccentric between lens and lens, and lens cause not eccentric and PV to change in an assembling process with lens barrel fitness thus the resolving power caused declines, distorting becomes the problem such as greatly, is the problem that camera manufacturing industry is difficult to capture always.

Present packaging technology depends on black thing and lens barrel to locate the bias between eyeglass, the above camera of five mega pixels, especially eight mega pixels or 1,003 mega pixel cameras generally can only be optimized within tolerance to 3um from design the bias of eyeglass, and the manufacturing tolerance of lens barrel is the highest can only ensure 5um within, ensure that 3um can not realize volume production steady in a long-term once in a while, very large negative effect is produced to the shipment of camera.

The camera lens of traditional design, for identical image planes size, TTL and optics overall length are general longer, generally like this can obtain more level and smooth light, contribute to improving tolerance.But modern cell phones is ultrathin more and more, must shorten TTL, this is a main bugbear of current camera design and production.

Utility model content

Technical problem to be solved in the utility model is, provides a kind of camera, has low aberration.The utility model is achieved in that

A kind of camera, comprises and being arranged in order by thing side to image side:

First lens, it is positive lens, has low-refraction;

Second lens, it is negative lens, has high index of refraction;

3rd lens, it is positive lens, has low-refraction;

4th lens, it is negative lens, has low-refraction;

The diaphragm of described camera is before described first lens.

Further, the thing side of described first lens has convex surface, and image side has convex surface; The thing side of described second lens has concave surface, and image side has concave surface; The thing side of described 3rd lens has concave surface, and image side has convex surface; The paraxial place, image side of described 4th lens is concave surface, and axle is outward convex surface, and paraxial place, thing side is convex surface, and axle is outward concave surface; Described 3rd lens are moon bending lens.

Further, described first lens are sized non-spherical resin lens to the 4th lens.

Further, described camera is 5,000,000 or eight mega pixels, and F/ST≤2.2; Wherein, F is the focal length of this camera, and ST is the Entry pupil diameters of this camera.

Further, if F1, F2, F3, F4 are respectively the focal length of the first lens, the second lens, the 3rd lens, the 4th lens, F is the focal length of camera, V1, V2, V3, V4 are respectively the Abbe number of the first lens, the second lens, the 3rd lens, the 4th lens, then (F1*V1+F2*V2)/F<4; (F3*V3+F4*V4)/F<2.

Further, on the maximum effective diameter edge thickness TE of described 4th lens and axle, center thickness TC meets following condition:

0.6<TC/TE<1.0；

Wherein, TE is maximum effective diameter edge thickness; TC is center thickness on axle.

Further, described first lens meet following condition to the distance of camera image planes and camera image planes height:

TTL/D≤0.8；

Wherein, TTL is the distances of the first lens to image planes;

D is camera image planes height.

Further, F1/F3<1.2; F2/F4<3;

Further, F1/F<1.

Compared with prior art, four lens type structures that the utility model adopts " Negative-Positive-Negative-negative ", and these four camera lenses adopt the combination of refractive indices of " low-Gao-low-low ", effectively reduce all kinds of aberration, have good imaging effect.

Accompanying drawing explanation

Fig. 1: the utility model camera composition structural representation;

Fig. 2: conventional lenses imaging optical path schematic diagram;

Fig. 3: the utility model camera imaging light path schematic diagram;

Fig. 4: conventional lenses axle outer visual field point range figure;

Fig. 5: the Ray Fan of the utility model camera respectively in 0,0.2,0.4,0.6,0.8,1.0 visual fields schemes;

Fig. 6: the utility model camera is respectively at the point range figure of 0,0.2,0.4,0.6,0.8,1.0 visual fields;

Fig. 7: the utility model camera curvature of field test pattern;

Fig. 8: the utility model camera distortion test pattern;

Fig. 9: the utility model camera lateral chromatic aberration test pattern;

Figure 10: the utility model camera longitudianal aberration test pattern.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.

As shown in Figure 1, the utility model camera comprises the first lens 1, second lens 2, the 3rd lens 3 and the 4th lens 4 that are arranged in order by thing side to image side.Wherein, the first lens 1 are positive lens, have low-refraction; Second lens 2 are negative lens, have high index of refraction; 3rd lens 3 are positive lens, have low-refraction; 4th lens 4 are negative lens, have low-refraction.Generally speaking, refractive index is called high index of refraction more than 1.59,1.55 hereinafter referred to as low-refraction.By this quadruple lenses structure of " Negative-Positive-Negative-negative " and the combination of refractive indices of " low-Gao-low-low ", can effectively reduce transverse direction and longitudianal aberration.Fig. 9 and Figure 10 is respectively the utility model camera lateral chromatic aberration and longitudianal aberration test pattern, as can be seen from the figure, lateral chromatic aberration controls within 2um by the utility model camera, is controlled by longitudianal aberration, within 0.05mm, to inhibit chromatic aberation well.

First lens 1 adopt thing side to have convex surface, and image side has the positive lens of convex surface; Second lens 2 adopt thing side to have concave surface, and image side has the negative lens of concave surface; 3rd lens 3 adopt thing side to have concave surface, and image side has the positive lens of convex surface; 4th lens 4 adopt paraxial place, image side to be concave surface, and axle is outward convex surface, and paraxial place, thing side is convex surface, and axle is outward the negative lens of concave surface.Meanwhile, the image side of the 4th lens 4 can adopt cucurbit face structure as shown in Figure 1, namely middle part thin top and bottom thick.First lens 1 all adopt sized non-spherical resin lens to the 4th lens 4.Non-spherical lens has better face type degree of freedom, can maintain good lens error correction effect, to obtain required optical property.Non-spherical lens can bring outstanding acutance and the resolution of Geng Gao, simultaneously more frivolous than spherical lens, makes the miniaturization of camera become possibility.

This camera is 5,000,000 or eight mega pixels, and F/ST≤2.2; Wherein, F is the focal length of this camera, and ST is the Entry pupil diameters of this camera.If F1, F2, F3, F4 are respectively the focal length of the first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, F is the focal length of camera, V1, V2, V3, V4 are respectively the Abbe number of the first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, then (F1*V1+F2*V2)/F<4; (F3*V3+F4*V4)/F<2, meanwhile, on the maximum effective diameter edge thickness TE of the 4th lens 4 of this camera and axle, center thickness TC meets following condition:

0.6<TC/TE<1.0；

Fig. 2 and Fig. 3 is respectively conventional lenses and the utility model camera imaging light path schematic diagram, and can find out, the utility model camera comparatively conventional lenses can more accurately focus on.

In eccentric correction, the utility model camera adopts the first lens 1 and the second lens 2 composite design, and the multiplet of the 3rd lens 3 and the 4th lens 4 composite design is optimized.The eccentric allowance of first lens 1 of camera is 2um, and the eccentric allowance of the second lens 2 is 3.5um, and the eccentric allowance of the 3rd lens 3 is 4um, and the eccentric allowance of the 4th lens 4 is 6um.The entirety bias that the first lens 1 and the second lens 2 need be made to combine during eccentric correction is the entirety bias that the zero, three lens 3 and the 4th lens 4 combine is zero.The utility model pays the utmost attention to the tolerance sensitivities of first eyeglass.When group enters lens barrel successively for the first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, by manufacturing tolerances, the lens barrel bias of the second lens 2, the 3rd lens 3, the 4th lens 4 increases successively, the eccentricity of glasses lens of such first lens 1 will be minimum, eccentricity pressure during Tolerance Optimization is concentrated on the first lens 1, thus reduce the eccentric tolerance of other eyeglasses, especially reduce the eccentric tolerance of the 4th lens 4, thus reduce the curvature of field and the distortion of camera.

When using Zemax software to design, specifically by using the operands such as FCGT, FCGS rationally to increase the weight of weight, make the curvature of field, distortion tends to be reasonable.Fig. 7 and Fig. 8 is respectively the utility model camera curvature of field and distortion test pattern, can make aberration control within 2%, the curvature of field controlled within 0.05mm by the optimization of said method.

The utility model, also by being optimized the Ray-Fan figure of camera, forces the Ray Fan of balance camera to scheme by DXDX, DYDY operand.Figure 5 shows that the Ray Fan of camera respectively in 0,0.2,0.4,0.6,0.8,1.0 visual fields schemes, Figure 6 shows that camera respectively at the point range figure of 0,0.2,0.4,0.6,0.8,1.0 visual fields.Scheme to force the camera after optimizing to obtain good imaging characteristic by Ray Fan.Figure 4 shows that conventional lenses axle outer visual field point range figure, can find out that defining comet formation in the outer visual field of axle trails.

If TTL is the distance of the first lens 1 to image planes 5, D is camera image planes 5 height, then in the utility model camera, and TTL/D≤0.8, F1/F3<1.2, F2/F4<3, F1/F<1.Also make F1>F3 by design, camera can be made to have with great visual angle, keep short TTL simultaneously.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.

Claims

1. a camera, is characterized in that, comprises being arranged in order by thing side to image side:

First lens, it is positive lens, has low-refraction;

Second lens, it is negative lens, has high index of refraction;

3rd lens, it is positive lens, has low-refraction;

4th lens, it is negative lens, has low-refraction;

The diaphragm of described camera is before described first lens.

2. camera as claimed in claim 1, it is characterized in that, the thing side of described first lens has convex surface, and image side has convex surface; The thing side of described second lens has concave surface, and image side has concave surface; The thing side of described 3rd lens has concave surface, and image side has convex surface; The paraxial place, image side of described 4th lens is concave surface, and axle is outward convex surface, and paraxial place, thing side is convex surface, and axle is outward concave surface; Described 3rd lens are moon bending lens.

3. camera as claimed in claim 1, it is characterized in that, described first lens are sized non-spherical resin lens to the 4th lens.

4. camera as claimed in claim 1, is characterized in that, described camera is 5,000,000 or eight mega pixels, and F/ST≤2.2; Wherein, F is the focal length of this camera, and ST is the Entry pupil diameters of this camera.

5. camera as claimed in claim 1, it is characterized in that, if F1, F2, F3, F4 are respectively the focal length of the first lens, the second lens, the 3rd lens, the 4th lens, F is the focal length of camera, V1, V2, V3, V4 are respectively the Abbe number of the first lens, the second lens, the 3rd lens, the 4th lens, then (F1*V1+F2*V2)/F<4; (F3*V3+F4*V4)/F<2.

6. camera as claimed in claim 1, is characterized in that, on the maximum effective diameter edge thickness TE of described 4th lens and axle, center thickness TC meets following condition:

0.6<TC/TE<1.0；

7. camera as claimed in claim 3, is characterized in that, described first lens meet following condition to the distance of camera image planes and camera image planes height:

TTL/D≤0.8；

Wherein, TTL is the distances of the first lens to image planes;

D is camera image planes height.

8. camera as claimed in claim 5, is characterized in that, F1/F3<1.2; F2/F4<3;

9. camera as claimed in claim 5, is characterized in that, F1/F<1.