CN201226046Y - Miniature high-pixel camera lens - Google Patents

Abstract

The utility model relates to a miniature high-pixel camera lens, including a lens barrel and a support, an aperture is provided at the front end of the lens barrel, a light-collecting port is provided at one end of the lens barrel near the aperture, and a first lens, a second lens, a third lens and a fourth lens are sequentially installed in the cavity of the lens barrel from the light-collecting port to the other end of the lens barrel, characterized in that the surface of the first lens is a biconvex plastic aspheric surface, the second lens and the third lens are both plastic aspheric mirrors with a meniscus cross section, and the fourth lens is a plastic aspheric mirror with a hyperbolic cross section. The utility model is mainly used in high-pixel mobile phones, and has the advantages of small size, simple structure, convenient installation and high imaging quality.

Description

A kind of miniature high-pixel camera camera lens

[technical field]

The utility model relates to a kind of miniature high-pixel camera camera lens.

[background technology]

In recent years, the handset demand amount of carrying camera is increasing, pixel request is also more and more higher simultaneously, and this class camera system is extensive use of CCD (charged coupled device) or CMOS solid imaging devices such as (complementary metal oxide semiconductor).The deisgn approach of mobile phone is in lightening now, and the space that then gives this class camera system installation is just littler, thereby requires camera system miniaturization and lightness; And the consumer is also more and more higher to the image quality requirement of mobile phone camera, the camera cell phone of main flow is mainly 1,300,000 pixels and 2,000,000 pixels on the market now, the photo of being taken is no matter from the sharpness of integral body, or the homogeneity aspect of illumination, the effect of taking far away from digital camera, can only be provided on the mobile phone and appreciate, can not reach the level of printing exquisite photo.TTL as high pixel mirror is first (optics length overall) is long, is difficult to satisfy the demand for development of frivolous mobile phone.Work out the problem that the smaller again camera of a kind of good imaging quality, volume is demanded urgently making great efforts for relevant dealer thus, the utility model is under a kind of like this background and research and develop.

[utility model content]

The utility model has overcome the deficiency of above-mentioned technology, and a kind of simple in structure, easy for installation, miniature high-pixel camera camera lens that image quality is high is provided.

For achieving the above object, the utility model has adopted following technical proposal:

A kind of miniature high-pixel camera camera lens, include lens barrel and bearing, be provided with diaphragm foremost at lens barrel, lean on an end of diaphragm to be provided with daylight opening at lens barrel, in the cavity of lens barrel, from described daylight opening toward the lens barrel other end, first lens, second lens, the 3rd lens and the 4th lens are installed successively, the surface that it is characterized in that described first lens is a biconvex plastic cement aspheric surface, second lens, the 3rd lens are the plastic cement aspheric mirror that the cross section is curved month type, and the 4th lens are the plastic cement aspheric mirror that the cross section is hyperbola.

A kind of miniature high-pixel camera camera lens from the above mentioned is characterized in that being provided with the light-shielding sheet that can eliminate veiling glare between second lens and the 3rd lens between described first lens and second lens.

A kind of miniature high-pixel camera camera lens from the above mentioned is characterized in that being provided with the delustring spacer ring that can effectively stop invalid parasitic light between described the 3rd lens and the 4th lens.

A kind of miniature high-pixel camera camera lens from the above mentioned is characterized in that being provided with optical filter on described the 4th lens outside, described bearing.

A kind of miniature high-pixel camera camera lens from the above mentioned is characterized in that the aspherical shape of described second lens, the 3rd lens and the 4th lens satisfies following equation: Z=cy ²/ { 1+ √ [1-(1+k) c ²y ²]+α ₁y ²+ α ₂y ⁴+ α ₃y ⁶+ α ₄y ⁸+ α ₅y ¹⁰+ α ₆y ¹²+ α ₇y ¹⁴+ α ₈y ¹⁶, in formula, parameter c is the pairing curvature of radius, and y is a radial coordinate, and k is the circular cone whose conic coefficient, α ₁To α ₈Represent the pairing coefficient of each radial coordinate respectively.

A kind of miniature high-pixel camera camera lens from the above mentioned is characterized in that being made by light-shielding sheet at described diaphragm.

The beneficial effects of the utility model are: the utility model compared with prior art has following advantage: 1. miniature high-pixel camera head of the present utility model can reach 5,000,000 pixels, and existing micro pick-up lens is generally 1,300,000,2,000,000 pixels; 2. the utility model imaging is clear, the sharpness height, and color is good, can print exquisite photograph; 3. the existing general center of camera lens illumination height, periphery is low, and the utility model illuminance of image plane is even, the relative exposure height; 4. the utility model can adopt 3,000,000 or 5,000,000 CMOS sensor; 5. the utility model volume is little, is fit to the lightening requirement of mobile phone.

[description of drawings]

Be described in further detail below in conjunction with accompanying drawing and embodiment of the present utility model:

Fig. 1 is a schematic perspective view of the present utility model;

Fig. 2 is the utility model diagrammatic cross-section.

[embodiment]

As shown in Figure 1 and Figure 2, a kind of miniature high-pixel camera camera lens includes lens barrel 1 and bearing 2, lens barrel 1 be provided with diaphragm 4 foremost, diaphragm 4 is made by light-shielding sheet; Lean on an end of diaphragm 4 to be provided with daylight opening 101 at lens barrel 1, in the cavity of lens barrel 1, from daylight opening 101 toward lens barrel 1 other end, first lens 3, second lens 5, the 3rd lens 7 and the 4th lens 9 are installed successively, the surface of first lens 3 is a biconvex plastic cement aspheric surface, second lens 5, the 3rd lens 7 are the plastic cement aspheric mirror that the cross section is curved month type, and the 4th lens 9 are the plastic cement aspheric mirror of hyperbola for the cross section.Between first lens 3 and second lens 5, be provided with the light-shielding sheet 11 that can eliminate veiling glare between second lens 5 and the 3rd lens 7, between the 3rd lens 7 and the 4th lens 9, be provided with the delustring spacer ring 6 that can effectively stop invalid parasitic light; On described the 4th lens 9 outsides, described bearing 2, be provided with optical filter 10.

The aspherical shape of second lens 5, the 3rd lens 7 and the 4th lens 9 satisfies following equation: Z=cy ²/ { 1+ √ [1-(1+k) c ²y ²]+α ₁y ²+ α ₂y ⁴+ α ₃y ⁶+ α ₄y ⁸+ α ₅y ¹⁰+ α ₆y ¹²+ α ₇y ¹⁴+ α ₈y ¹⁶, in formula, parameter c is the pairing curvature of radius, and y is a radial coordinate, and k is the circular cone whose conic coefficient, α ₁To α ₈Represent the pairing coefficient of each radial coordinate respectively.

Mobile lens good imaging quality ring, one very The key factor be the off-centre of plastic lens, existing aspherical lens processing off-centre generally is controlled at 0.003mm, the utility model is considered existing aspheric surface processing technology, aspheric surface face type has been done special control, the utility model first lens 3, second lens 5, the 3rd lens 7 and the 4th lens 9 all use plastic aspherical element, three aspheric surface face type designs are milder, eccentric allowance reaches 0.005mm～0.007mm, image quality changes very little, greatly reduce aspheric surface moulding difficulty, improved lens erection yields and production efficiency, saved cost greatly.

Mobile lens good imaging quality ring, another key factor is the airspace control between eyeglass, the utility model is controlled airspace between eyeglass by light-shielding sheet and delustring spacer ring, the tolerance of consideration portion product can influence separates picture, the utility model has been done special processing in design, the eyeglass interbody spacer reduces separating the picture influence, has reduced the difficulty of processing of portion's product.

Change for reducing the refraction angle of light between each lens, be controlled to image distortion, need to reduce distance between first lens 3 and second lens 5 on the structure; The distance that the 3rd lens 7 and the 4th lens 9 are good for widens, and makes light excessively mild, the eccentric influence that brings between attenuating face; For improving the curvature of field, the 3rd lens 7 two sides all are designed to the hyperbolic curve aspheric surface; Diaphragm uses light-shielding sheet, and the more effective veiling glare that blocks makes image planes cleaner, and is more clear.

Be provided with optical filter 10 on the bearing 2 in the 4th lens 9 outsides, optical filter 10 belows are exactly the CMOS sensitive chip, and light enters from optical filter 10, and optical filter 10 also has the certain protection effect to chip simultaneously, simultaneously ruddiness are ended, and keep the good reductibility of color.

The aspherical shape of second lens, 5, the three lens, 7, the four lens 9 satisfies following equation: Z=cy ²/ { 1+ √ [1-(1+k) c ²y ²]+α ₁y ²+ α ₂y ⁴+ α ₃y ⁶+ α ₄y ⁸+ α ₅y ¹⁰+ α ₆y ¹²+ α ₇y ¹⁴+ α ₈y ¹⁶, in formula, parameter c is the pairing curvature of radius, and y is radial coordinate (its unit is identical with length of lens unit), and k is the circular cone whose conic coefficient.When k-factor face deltoid less than-1 time is a hyperbolic curve, equaling at-1 o'clock is para-curve, between-1 being oval between 0 the time, equals at 0 o'clock for circular, be oblateness greater than 0 o'clock.α 1 to α 8 represents the pairing coefficient of each radial coordinate respectively, can accurately set the geomery of lens front and back both-sided aspherical by above parameter.

The utility model first lens 3 have the positive refraction effect, second lens 4 have the negative refraction effect, the 3rd lens 5 have the positive refraction effect, the 4th lens 6 have the negative refraction effect, in addition owing to second lens 4, the 3rd lens 5, the 4th lens 6 have the negative refraction effect, thereby make optical system picture side main face forward shift, make the contraction in length of optical system.

Claims (6)

1. A miniature high-pixel camera lens, comprising a lens barrel (1) and a seat (2), the front end of the lens barrel (1) is provided with a diaphragm (4), and the lens barrel (1) is close to the diaphragm. One end of (4) is provided with light through hole (101), in the cavity of lens barrel (1), from described light through hole (101) toward lens barrel (1) other end, first lens ( 3), the second lens (5), the third lens (7) and the fourth lens (9), are characterized in that the surface of the first lens (3) is a biconvex plastic aspheric surface, and the second lens (5) ), the third lens (7) is a plastic aspheric mirror with a meniscus cross section, and the fourth lens (9) is a plastic aspheric mirror with a hyperbolic cross section. 2. A miniature high-pixel camera lens according to claim 1, characterized in that between the first lens (3) and the second lens (5), the second lens (5) and the third lens (7) is provided with the shading paper (11) that can eliminate stray light between. 3. A miniature high-pixel camera lens according to claim 1, characterized in that an extinction barrier capable of effectively blocking invalid stray light is provided between the third lens (7) and the fourth lens (9). Circle (6). 4. A miniature high-resolution camera lens according to claim 1, characterized in that an optical filter (10) is provided on the outside of the fourth lens (9) and on the seat (2). 5. A miniature high-resolution imaging lens according to any one of claims 1 to 3, characterized in that the non- The spherical shape satisfies the following equation: Z=cy ² /(1+√[1-(1+k)c ² y ² ]}+α ₁ y ² +α ₂ y ⁴ +α ₃ y ⁶⁺ α ₄ y ⁸ + α ₅ y ¹⁰ + α ₆ y ¹² + α ₇ y ¹⁴ + α ₈ y ¹⁶ , in the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, k is the conic conic coefficient, α ₁ to α _{and 8} respectively represent the coefficients corresponding to each radial coordinate. 6. A miniature high-resolution camera lens according to claim 1, characterized in that the aperture (4) is made of light-shielding paper (11).

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