CN104166221A - 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, particularly relate to a kind of optical lens assembly.

Background technology

The mobile lens of existing 1/55M adopts 4P structure more, and cost is higher.And adopt the 5M product of 3P to exist pixel cell large more, and modular volume is large, and aperture is little, poor with the CRA matching of chip, and imaging effect is poor, high in cost of production problem.

Summary of the invention

For addressing the above problem, the invention provides a kind of optical lens assembly, its structure adopts diaphragm preposition, and each lens radius of curvature and THICKNESS CONTROL are in certain scope, make it to form special shape, arrange in pairs or groups each other, reduced the distance of launching site, effectively dwindled camera lens perforate on shell, reduced camera lens front glass area, not only reduce cost, increased the aesthetic feeling of mobile phone, and can reach the imaging effect of 1/55M.

The technical solution adopted in the present invention is: a kind of optical lens assembly, comprise the first lens, the second lens, the 3rd lens and the optical filter that from object side, to imaging side, are arranged in order, also comprise diaphragm, described diaphragm is arranged at face order one side of described first lens, the center thickness P3TC ratio of the center thickness P1TC of described first lens and the 3rd lens is: P3TC/P1TC=1～2, and face order one radius of curvature R 1 of first lens is R2/R1=-1～-5 or-3～-5 with radius of curvature R 2 ratios of face order two; The center thickness P2TC of described the second lens and first lens are to the clearance thickness P1-P2AC between the second lens, ratio is P2TC/P1-P2AC=1～2, the effective focal length f2 of described the second lens and the effective focal length f1 of first lens, its ratio f2/f1=1～2.5; The aspheric surface formula of described first lens (1), the second lens, the 3rd lens is: $z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+{\mathrm{\α}}_1{r}^2+{\mathrm{\α}}_2{r}^4+{\mathrm{\α}}_3{r}^6+{\mathrm{\α}}_4{r}^8+{\mathrm{\α}}_5{r}^{10}+{\mathrm{\α}}_6{r}^{12}+{\mathrm{\α}}_7{r}^{14}+{\mathrm{\α}}_8{r}^{16},$ Wherein, z represents the z coordinate figure of lens surface each point, and r represents the Y-axis coordinate figure of each point on lens surface, the inverse of the radius of curvature R that c is lens surface, and k is circular cone coefficient, α ₁, α ₂, α ₃, α ₄, α ₅, α ₆, α ₇, α ₈for asphericity coefficient.

Preferably, described first lens material is APEL or ZEONEX.

Preferably, described the second lens material is EP5000.

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

To being further improved to of technique scheme, described small size high definition mobile lens, also comprises cover glass sheet, and it is located at the imaging side of described optical filter.

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

Above R value unit is mm.

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

Above R value unit is mm.

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

The present invention is the 5M mobile lens of 3P, collocation market mainstream chip, diaphragm is preposition, each lens radius of curvature and THICKNESS CONTROL are in certain proportional range, and collocation, forms comparatively special shape each other, thereby reduced the distance of launching site, effectively dwindle the camera lens perforate on shell, reduced camera lens front glass area, reduced cost; Six faces of 3 glass lens are aspheric surface, and collocation can effectively be proofreaied and correct all kinds of aberrations such as the curvature of field, astigmatism, ratio chromatism, together, can reach the photo-quality imaging effect of 1/55M simultaneously.

Also adopt 2.2 large apertures simultaneously, can increase the logical light quantity of camera lens, improve imaging image quality, CRA matches with mainstream chip.

Accompanying drawing explanation

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, the distortion curve of the embodiment of the present invention 1 optical lens assembly;

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

The relative exposure 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 assemblies;

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

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

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

The relative exposure curve of Figure 12 embodiment of the present invention 2 optical lens assemblies;

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

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

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, it is a kind of aspheric mobile lens, it comprises first lens 1, the second lens 2, the 3rd lens 3, optical filter 4 and the diaphragm 5 being arranged in order from object side to imaging side, diaphragm 5 is arranged at face order one 11 sides of first lens 1, thereby shows as the preposition mode of diaphragm.The center thickness P3TC of the center thickness P1TC of first lens 1 and the 3rd lens 3, both ratios are P3TC/P1TC=1～2, the radius of curvature R 1 of the face order 1 of first lens 1 is R2/R1=-1～-5 with the ratio of the radius of curvature R 2 of face order 2 12.Clearance thickness P1-P2AC between the center thickness P2TC of the second lens 2 and first lens 1 to second lens 2, ratio is P2TC/P1-P2AC=1～2.The effective focal length f1 of the effective focal length f2 of the second lens 2 and first lens 1, its ratio f2/f1=1～2.5.

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

Wherein, the aspheric surface formula of first lens 1, the second lens 2, the 3rd lens 3 is: $z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+{\mathrm{\α}}_1{r}^2+{\mathrm{\α}}_2{r}^4+{\mathrm{\α}}_3{r}^6+{\mathrm{\α}}_4{r}^8+{\mathrm{\α}}_5{r}^{10}+{\mathrm{\α}}_6{r}^{12}+{\mathrm{\α}}_7{r}^{14}+{\mathrm{\α}}_8{r}^{16},$ Wherein, z represents the z coordinate figure of lens surface each point, and r represents the Y-axis coordinate figure of each point on lens surface, the inverse of the radius of curvature R that c is lens surface, and k is circular cone coefficient, α ₁, α ₂, α ₃, α ₄, α ₅, α ₆, α ₇, α ₈for asphericity coefficient.

Concrete data, as table one, can specifically arrange lens combination according to these data:

Each lens data table of table one mobile phone lens assembly

This lens assembly adopts diaphragm preposition, and the design of large aperture FNO.2.2 improves image quality when guaranteeing systematic eccentricity tilt sensitive degree, reaches the high definition image quality of 1,/55,000,000 pixels.

With reference to Fig. 2～7, each curve by this camera lens can be found out, adopt three aspheric surface plastic lens, can effectively reduce all kinds of aberrations such as producing the curvature of field, astigmatism, ratio chromatism,, obtain good imaging effect, use on the market resins for universal use material to replace glass, the stable and technical maturity of forming technique, has solved the processing difficulties of glass mirror and the product yield that causes is low and the higher problem of cost simultaneously.

In first lens 1, R2 value is set to negative tortuosity ratio, make visual field, center the mtf value at 223lp/mm place be greater than 55% and most axle outside visual field at the mtf value of 223lp/mm, be greater than 40%, 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, make the limit thickness rate of eyeglass one be less than 2, guarantee that eyeglass cast gate meets the real demand of doing, and effectively shorten launching site distance, effectively dwindled camera lens perforate on shell, reduced camera lens front glass area, not only reduce cost, and can increase the aesthetic feeling of mobile phone.

Thickness arranges aspect, P3TC/P1TC=1～2, P2TC/P1P2AC=1～2, not only effectively guarantee the moulding process of eyeglass and the stability of camera lens, desensitising, and make the chief ray incident angle (CRA) of camera lens in each visual field, all can mate better the default CRA of image sensor (CMOS chip);

The disc of confusion size of camera lens from visual field, center to 0.8 visual field is all within the twice numerical range of the single pixel grain size of 1/5 inch of specification image sensor (COMS chip), the chief ray incident angle (CRA) of camera lens meets the requirement of image sensor (CMOS chip) to light receptivity scope, make it to have the features such as imaging sharpness is high, color is clearly demarcated, and color reducibility is good.

Embodiment 2:

With reference to Fig. 8, optical lens assembly of the present invention, is a kind of aspheric mobile lens, and it comprises first lens 1, the second lens 2, the 3rd lens 3, optical filter 4, diaphragm 5 and the cover glass sheet 6 being arranged in order from object side to imaging side.Diaphragm 5 is arranged at face order one 11 sides of first lens 1, thereby shows as the preposition mode of diaphragm.The center thickness P3TC of the center thickness P1TC of first lens 1 and the 3rd lens 3, both ratios are P3TC/P1TC=1～2, the radius of curvature R 1 of the face order 1 of first lens 1 is R2/R1=-3～-5 with the ratio of the radius of curvature R 2 of face order 2 12.Clearance thickness P1-P2AC between the center thickness P2TC of the second lens 2 and first lens 1 to second lens 2, ratio is P2TC/P1-P2AC=1～2.The effective focal length f1 of the effective focal length f2 of the second lens 2 and first lens 1, its ratio f2/f1=1～2.5.

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

Wherein, the aspheric surface formula of first lens 1, the second lens 2, the 3rd lens 3 is: $z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+{\mathrm{\α}}_1{r}^2+{\mathrm{\α}}_2{r}^4+{\mathrm{\α}}_3{r}^6+{\mathrm{\α}}_4{r}^8+{\mathrm{\α}}_5{r}^{10}+{\mathrm{\α}}_6{r}^{12}+{\mathrm{\α}}_7{r}^{14}+{\mathrm{\α}}_8{r}^{16},$ Wherein, z represents the z coordinate figure of lens surface each point, and r represents the Y-axis coordinate figure of each point on lens surface, the inverse of the radius of curvature R that c is lens surface, and k is circular cone coefficient, α ₁, α ₂, α ₃, α ₄, α ₅, α ₆, α ₇, α ₈for asphericity coefficient.

Concrete data, as table two, can specifically arrange lens combination according to these data:

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 improves image quality when guaranteeing systematic eccentricity tilt sensitive degree, reaches the high definition image quality of 1,/55,000,000 pixels;

With reference to Fig. 9～14, each curve by this camera lens can be found out, adopt three aspheric surface plastic lens, can effectively reduce all kinds of aberrations such as the curvature of field, astigmatism, ratio chromatism,, obtain good imaging effect, use on the market resins for universal use material to replace glass, the stable and technical maturity of forming technique, has solved the processing difficulties of glass mirror and the product yield that causes is low and the higher problem of cost simultaneously.

In first lens 1, R2 value is set to negative tortuosity ratio, make visual field, center the mtf value at 223lp/mm place be greater than 55% and most axle outside visual field at the mtf value of 223lp/mm, be greater than 40%, 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, guarantee that the limit thickness rate of eyeglass one is less than 2, guarantee that eyeglass cast gate meets the real demand of doing; Thickness arranges aspect, P3TC/P1TC=1～2, P2TC/P1P2AC=1～2, not only effectively guarantee the moulding process of eyeglass and the stability of camera lens, desensitising, and make the chief ray incident angle (CRA) of camera lens in each visual field, all can mate better the default CRA of image sensor (CMOS chip);

The disc of confusion size of camera lens from visual field, center to 0.8 visual field is all within the twice numerical range of the single pixel grain size of 1/5 inch of specification image sensor (COMS chip), the chief ray incident angle (CRA) of camera lens meets the requirement of image sensor (CMOS chip) to light receptivity scope, make it to have the features such as imaging sharpness is high, color is clearly demarcated, and color reducibility is good.

The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (7)

1. an optical lens assembly, comprise the first lens (1) being arranged in order to imaging side from object side, the second lens (2), the 3rd lens (3) and optical filter (4), also comprise diaphragm (5), it is characterized in that: described diaphragm (5) is arranged at face order one (11) side of described first lens (1), the center thickness P3TC ratio of the center thickness P1TC of described first lens (1) and the 3rd lens (3) is: P3TC/P1TC=1～2, face order one (11) radius of curvature R 1 of first lens (1) with radius of curvature R 2 ratios of face order two (12) is: R2/R1=-1～-5 or-3～-5, the center thickness P2TC of described the second lens (2) and first lens (1) are to the clearance thickness P1-P2AC between the second lens (2), ratio is P2TC/P1-P2AC=1～2, the effective focal length f1 of the effective focal length f2 of described the second lens (2) and first lens (1), its ratio f2/f1=1～2.5, the aspheric surface formula of described first lens (1), the second lens (2), the 3rd lens (3) is: $z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+{\mathrm{\α}}_1{r}^2+{\mathrm{\α}}_2{r}^4+{\mathrm{\α}}_3{r}^6+{\mathrm{\α}}_4{r}^8+{\mathrm{\α}}_5{r}^{10}+{\mathrm{\α}}_6{r}^{12}+{\mathrm{\α}}_7{r}^{14}+{\mathrm{\α}}_8{r}^{16},$ Wherein, z represents the z coordinate figure of lens surface each point, and r represents the Y-axis coordinate figure of each point on lens surface, the inverse of the radius of curvature R that c is lens surface, and k is circular cone coefficient, α ₁, α ₂, α ₃, α ₄, α ₅, α ₆, α ₇, α ₈for asphericity coefficient.

2. optical lens assembly according to claim 1, is characterized in that: described first lens (1) material is APEL or ZEONEX.

3. optical lens assembly according to claim 1, is characterized in that: described the second lens (2) material is EP5000.

4. optical lens assembly according to claim 1, is characterized in that: described the 3rd lens (3) material is APEL or ZEONEX.

5. optical lens assembly according to claim 1, is characterized in that: also comprise cover glass sheet (6), it is located at the imaging side of described optical filter (4).

6. optical lens assembly according to claim 1, is characterized in that: each surface parameter of described first lens (1), the second lens (2), the 3rd lens (3) is:

Above R value unit is mm.

7. optical lens assembly according to claim 1, is characterized in that: each surface parameter of described first lens (1), the second lens (2), the 3rd lens (3) is:

Above R value unit is mm.