CN104166221B - Optical lens assembly - Google Patents

Abstract

The invention relates to an optical lens assembly. The optical lens assembly comprises a first lens, a second lens, a third lens, an optical filter and a diaphragm which are sequentially arranged from the object side to the imaging side. The diaphragm is arranged on one side of the face sequence of the first lens, the specific value of the center thickness of the first lens and the center thickness of the third lens is P3TC/P1TC=1 to 2, and the specific value of the curvature radius of the first face sequence and the curvature radius of the second face sequence of the first lens is R2/R1=-1 to -5 or -3 to -5. The specific value of the center thickness of the second lens and the thickness of air gaps between the first lens and the second lens is P2TC/P1-P2AC=1 to 2, and the specific value of the effective focal length of the second lens and the effective focal length of the first lens is f2/f1=1 to 2.5. By means of the optical lens assembly, an aperture of an upper lens of a shell is contracted, the module size of a mobile phone lens is reduced, and cost is reduced; various aberration such as field curvature, astigmatism and chromatic difference of magnification can be corrected, and good imaging effect is achieved.

Description

A kind of optical lens assembly

Technical field

The present invention relates to optical lens for cell phone technical field, more particularly to a kind of optical lens assembly.

Background technology

Adopting 4P structure the mobile lens of existing 1/55M more, relatively costly.And using there is pixel list the 5M product of 3P more Unit is big, and modular volume is big, and aperture is little, poor with the CRA matching of chip, and imaging effect is poor, the problems such as high cost.

Content of the invention

For solving the above problems, the present invention provides a kind of optical lens assembly, and its structure adopts diaphragm preposition, and each lens are bent Rate radius and THICKNESS CONTROL, in certain scope, are allowed to form special shape, arrange in pairs or groups each other, reduce launch point Distance, effectively reduces camera lens perforate on shell, that is, reduce camera lens front glass area, not only reduce cost, add handss The aesthetic feeling of machine, and the imaging effect of 1/55M can be reached.

The technical solution adopted in the present invention is：A kind of optical lens assembly, arranges to one-tenth image side successively including from object side First lens of row, the second lens, the 3rd lens and optical filter, also include diaphragm, it is saturating that described diaphragm is arranged at described first The face sequence side of mirror, the center thickness P1TC of described first lens with the center thickness P3TC ratio of the 3rd lens is：P3TC/ P1TC=1～2, face sequence one radius of curvature R 1 of the first lens and radius of curvature R 2 ratio of face sequence two are R2/R1=-1～-5 Or -3～-5；Air gap thickness P1- between the center thickness P2TC of described second lens and the first lens to the second lens P2AC, ratio is P2TC/P1-P2AC=1～2, effective focal length f2 of described second lens and effective focal length f1 of the first lens, Its ratio f2/f1=1～2.5；Described first lens (1), the second lens, the aspherical formula of the 3rd lens are：

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+{\mathrm{\α}}_1{r}^2+{\mathrm{\α}}_2{r}^4+{\mathrm{\α}}_3{r}^6+{\mathrm{\α}}_4{r}^8+{\mathrm{\α}}_5{r}^{10}+{\mathrm{\α}}_6{r}^{12}+{\mathrm{\α}}_7{r}^{14}+{\mathrm{\α}}_8{r}^{16},$

Wherein, z represents the z coordinate value of lens surface each point, and r represents the Y-axis coordinate figure of each point on lens surface, and c is lens measure The inverse of the radius of curvature R in face, k is circular cone coefficient, α₁、α₂、α₃、α₄、α₅、α₆、α₇、α₈For asphericity coefficients.

Preferably, described first lens material is APEL or ZEONEX.

Preferably, described second lens material is EP5000.

Preferably, described 3rd lens material is APEL or ZEONEX.

Being improved to further to technique scheme, described small size high definition mobile lens, also include protective glass Piece, it is located at the one-tenth image side of described optical filter.

Preferably, described first lens, the second lens, each surface parameter of the 3rd lens are：

Above R value unit is mm.

Preferably, described first lens, the second lens, each surface parameter of the 3rd lens are：

Above R value unit is mm.

Described optical lens assembly, beneficial effect compared to existing technology is：

The present invention is the 5M mobile lens of 3P, market mainstream chip of arranging in pairs or groups, diaphragm is preposition, each lens radius of curvature and thickness Degree controls in certain proportion, arranges in pairs or groups each other, forms more special shape, thus reduce launch point away from From effectively reducing the camera lens perforate on shell, that is, reduce camera lens front glass area, reduce cost；3 glass lens Six faces are aspheric surface, and collocation can effectively correct all kinds of aberration such as the curvature of field, astigmatism, ratio chromatism, together, can reach simultaneously The photo-quality imaging effect of 1/55M.

Also adopt 2.2 large apertures simultaneously, camera lens thang-kng amount can be increased, improve imaging image quality, mate with mainstream chip CRA Good.

Brief description

Fig. 1 is the structural representation of the embodiment of the present invention 1 optical lens assembly；

Fig. 2 is the MTF curve of the embodiment of the present invention 1 optical lens assembly；

Fig. 3 is the curvature of field of the embodiment of the present invention 1 optical lens assembly, distortion curve；

The disc of confusion schematic diagram of Fig. 4 embodiment of the present invention 1 optical lens assembly；

The relative illumination curve of Fig. 5 embodiment of the present invention 1 optical lens assembly；

The CRA curve of Fig. 6 embodiment of the present invention 1 optical lens assembly；

The ratio chromatism, curve of Fig. 7 embodiment of the present invention 1 optical lens assembly；

Fig. 8 is the structural representation of the embodiment of the present invention 2 optical lens assembly；

Fig. 9 is the MTF curve of the embodiment of the present invention 2 optical lens assembly；

Figure 10 is the curvature of field of the embodiment of the present invention 2 optical lens assembly, distortion curve；

The disc of confusion schematic diagram of Figure 11 embodiment of the present invention 2 optical lens assembly；

The relative illumination curve of Figure 12 embodiment of the present invention 2 optical lens assembly；

The CRA curve of Figure 13 embodiment of the present invention 2 optical lens assembly；

The ratio chromatism, curve of Figure 14 embodiment of the present invention 2 optical lens assembly.

Specific embodiment

Below in conjunction with accompanying drawing, the present invention is further illustrated.

Embodiment 1：

With reference to Fig. 1, optical lens assembly of the present invention, is a kind of aspheric mobile lens, it is included from object Side is arranged to the first lens 1, the second lens 2, the 3rd lens 3, optical filter 4 and the diaphragm 5 becoming image side to be arranged in order, diaphragm 5 In face sequence 1 side of the first lens 1, thus showing as the preposition mode of diaphragm.The center thickness P1TC of the first lens 1 and The center thickness P3TC of three lens 3, both ratios are P3TC/P1TC=1～2, the radius of curvature of the face sequence 1 of the first lens 1 R1 is R2/R1=-1～-5 with the ratio of the radius of curvature R 2 of face sequence 2 12.The center thickness P2TC of the second lens 2 is saturating with first Air gap thickness P1-P2AC between mirror the 1 to the second lens 2, ratio is P2TC/P1-P2AC=1～2.Second lens 2 Effective focal length f2 and effective focal length f1 of the first lens 1, its ratio f2/f1=1～2.5.

The material of the first lens 1 and the 3rd lens is ZEONEX, and the material of the second lens is EP5000.

Wherein, the first lens 1, the second lens 2, the aspherical formula of the 3rd lens 3 are：

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+{\mathrm{\α}}_1{r}^2+{\mathrm{\α}}_2{r}^4+{\mathrm{\α}}_3{r}^6+{\mathrm{\α}}_4{r}^8+{\mathrm{\α}}_5{r}^{10}+{\mathrm{\α}}_6{r}^{12}+{\mathrm{\α}}_7{r}^{14}+{\mathrm{\α}}_8{r}^{16},$

Wherein, z represents the z coordinate value of lens surface each point, and r represents the Y-axis coordinate figure of each point on lens surface, and c is lens measure The inverse of the radius of curvature R in face, k is circular cone coefficient, α₁、α₂、α₃、α₄、α₅、α₆、α₇、α₈For asphericity coefficients.

Concrete data such as table one, can specifically arrange lens group according to this data:

The each lens data table of table one mobile phone lens assembly

This lens assembly adopts diaphragm preposition, the design of large aperture FNO.2.2 it is ensured that systematic eccentricity tilt sensitive degree same Shi Tigao image quality, reaches the high definition image quality of 1,/55,000,000 pixels.

With reference to Fig. 2～7, be can be seen that using three aspheric surface plastic lens by each curve of this camera lens, can effectively reduce Produce all kinds of aberrations such as the curvature of field, astigmatism, ratio chromatism, obtain good imaging effect, simultaneously using resins for universal use material on the market Replace glass, forming technique is stable and technical maturity, the product yield solving the processing difficulties of glass lens and leading to low and Relatively costly problem.

In first lens 1, R2 value is set to negative tortuosity ratio so that mtf value at 223lp/mm for the central vision is more than 55% and the outer visual field of most axle is more than 40% in the mtf value of 223lp/mm, greatly improve the imaging performance of 3P lens structure, Reach the imaging effect of 4P lens structure.

R2/R1=-1～-2 in the middle of eyeglass one are so that the side thickness rate of eyeglass one is less than 2 it is ensured that eyeglass cast gate meets real doing Demand, and effective shortening launch point distance, effectively reduce camera lens perforate on shell, that is, reduce camera lens front glass area, no Reduced by only cost, and the aesthetic feeling of mobile phone can be increased.

Thickness setting aspect, P3TC/P1TC=1～2, P2TC/P1P2AC=1～2, the molding of eyeglass is not only effectively ensured The stability of technique and camera lens, desensitising, and make the chief ray incidence angles (CRA) of camera lens equal energy in each visual field The preferably default CRA of coupling image sensor (CMOS chip)；

Camera lens is from the disperse spot size of central vision to 0.8 visual field all in 1/5 inch gage image sensor (COMS core Piece) single pixel granular size twice numerical range within, the chief ray incidence angles (CRA) of camera lens meet image sensor (CMOS chip) requirement to light receiver performance range, is allowed to there is imaging sharpness height, color clearly, color reducibility is good The features such as.

Embodiment 2：

With reference to Fig. 8, optical lens assembly of the present invention, is a kind of aspheric mobile lens, it is included from object Side is to the first lens 1, the second lens 2, the 3rd lens 3, optical filter 4, diaphragm 5 and the protective glass piece becoming image side to be arranged in order 6.Diaphragm 5 is arranged at face sequence 1 side of the first lens 1, thus showing as the preposition mode of diaphragm.The center of the first lens 1 is thick The degree P1TC and center thickness P3TC of the 3rd lens 3, both ratios are P3TC/P1TC=1～2, the face sequence 1 of the first lens 1 Radius of curvature R 1 be R2/R1=-3～-5 with the ratio of the radius of curvature R 2 of face sequence 2 12.The center thickness of the second lens 2 Air gap thickness P1-P2AC between P2TC and first lens the 1 to the second lens 2, ratio is P2TC/P1-P2AC=1～2. Effective focal length f2 of the second lens 2 and effective focal length f1 of the first lens 1, its ratio f2/f1=1～2.5.

The material of the first lens 1 and the 3rd lens is APEL, and the material of the second lens is EP5000.

Wherein, the first lens 1, the second lens 2, the aspherical formula of the 3rd lens 3 are：

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+{\mathrm{\α}}_1{r}^2+{\mathrm{\α}}_2{r}^4+{\mathrm{\α}}_3{r}^6+{\mathrm{\α}}_4{r}^8+{\mathrm{\α}}_5{r}^{10}+{\mathrm{\α}}_6{r}^{12}+{\mathrm{\α}}_7{r}^{14}+{\mathrm{\α}}_8{r}^{16},$

Wherein, z represents the z coordinate value of lens surface each point, and r represents the Y-axis coordinate figure of each point on lens surface, and c is lens measure The inverse of the radius of curvature R in face, k is circular cone coefficient, α₁、α₂、α₃、α₄、α₅、α₆、α₇、α₈For asphericity coefficients.

Concrete data such as table two, can specifically arrange lens group according to this data:

The each lens data table of table two mobile phone lens assembly

This mobile lens assembly adopts diaphragm preposition, and the design of large aperture FNO.2.2 is it is ensured that systematic eccentricity tilt sensitive degree While improve image quality, reach the high definition image quality of 1,/55,000,000 pixels；

With reference to Fig. 9～14, be can be seen that using three aspheric surface plastic lens by each curve of this camera lens, can effectively subtract All kinds of aberration such as the little curvature of field, astigmatism, ratio chromatism, obtains good imaging effect, simultaneously using resins for universal use material on the market Replace glass, forming technique is stable and technical maturity, the product yield solving the processing difficulties of glass lens and leading to low and Relatively costly problem.

In first lens 1, R2 value is set to negative tortuosity ratio so that mtf value at 223lp/mm for the central vision is more than 55% and the outer visual field of most axle is more than 40% in the mtf value of 223lp/mm, greatly improve the imaging performance of 3P lens structure, Reach the imaging effect of 4P lens structure；

In first lens 1, R2/R1=-4～-5 are it is ensured that the side thickness rate of eyeglass one is less than 2 it is ensured that eyeglass cast gate meets in fact Do demand；Thickness setting aspect, P3TC/P1TC=1～2, P2TC/P1P2AC=1～2, the molding of eyeglass is not only effectively ensured The stability of technique and camera lens, desensitising, and make the chief ray incidence angles (CRA) of camera lens equal energy in each visual field The preferably default CRA of coupling image sensor (CMOS chip)；

Camera lens is from the disperse spot size of central vision to 0.8 visual field all in 1/5 inch gage image sensor (COMS core Piece) single pixel granular size twice numerical range within, the chief ray incidence angles (CRA) of camera lens meet image sensor (CMOS chip) requirement to light receiver performance range, is allowed to there is imaging sharpness height, color clearly, color reducibility is good The features such as.

Embodiment described above only have expressed the several embodiments of the present invention, and its description is more concrete and detailed, but simultaneously Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for those of ordinary skill in the art For, without departing from the inventive concept of the premise, some deformation can also be made and improve, these broadly fall into the guarantor of the present invention Shield scope.Therefore, the protection domain of patent of the present invention should be defined by claims.

Claims (3)

1. a kind of optical lens assembly, including from object side to the first lens (1) becoming image side to be arranged in order, the second lens (2), the 3rd lens (3) and optical filter (4), also include diaphragm (5) it is characterised in that：Described diaphragm (5) It is arranged at face sequence one (11) side of described first lens (1), the center thickness P3TC of described 3rd lens (3) and The center thickness P1TC ratio of one lens (1) is：P3TC/P1TC=1～2, the face sequence of the first lens (1) Two (12) radius of curvature R 2 with face sequence one (11) radius of curvature R 1 ratio is：R2/R1=- 1～-5 or - 3～-5；The center thickness P2TC of described second lens (2) and the first lens (1) are between the second lens (2) Air gap thickness P1-P2AC, ratio is P2TC/P1-P2AC=1～2, the having of described second lens (2) Effect focal length f2 and effective focal length f1 of the first lens (1), its ratio f2/f1=1～2.5；Described first is saturating Mirror (1), the second lens (2), the aspherical formula of the 3rd lens (3) are：

,

Wherein, z represents the z coordinate figure of lens surface each point, and r represents the Y axial coordinate value of each point on lens surface, C is the inverse of the radius of curvature R of lens surface, and k is circular cone coefficient, α₁、 α₂、 α₃、 α₄、 α₅、 α₆、 α₇、 α₈For asphericity coefficients；

Described first lens (1), the second lens (2), each surface parameter of the 3rd lens (3) are：

Above R value unit is mm；

Described first lens (1) material is APEL or ZEONEX；

Described second lens (2) material is EP5000.

2. the optical lens assembly according to claim 1 it is characterised in that：Described 3rd lens (3) material For APEL or ZEONEX.

3. the optical lens assembly according to claim 1 it is characterised in that：Also include protective glass piece (6), It is located at the one-tenth image side of described optical filter (4).