CN101782677B - Four-piece imaging lens system - Google Patents
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- CN101782677B CN101782677B CN 200910003358 CN200910003358A CN101782677B CN 101782677 B CN101782677 B CN 101782677B CN 200910003358 CN200910003358 CN 200910003358 CN 200910003358 A CN200910003358 A CN 200910003358A CN 101782677 B CN101782677 B CN 101782677B
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Abstract
The invention discloses a four-piece imaging lens system, which from an object side to an image side sequentially comprises: a first lens with a positive refracting power, a second lens with a negative refracting power, a third lens with a negative refracting power and a fourth lens with a negative refracting power, wherein the front surface of the third lens is a convex surface and the rear surface of the third lens is a concave surface; and the fourth lens has aspheric surfaces. In the four-piece imaging lens system, only four lenses have refracting power, so the structure and arrangement mode of the lenses can effectively reduce the volume of the lens system, reduce the sensitivity of the optical system and acquire high resolution power as the same time.
Description
Technical field
The present invention relates to a kind of imaging lens group, particularly relate to a kind of miniaturization four-piece imaging lens system that is applied to camera cell phone.
Background technology
Recent years, along with the rise of mobile phone camera, the demand of miniaturization phtographic lens day by day improves; And the photosensory assembly of general phtographic lens is nothing more than being photosensitive coupling component (Charge Coupled Device; CCD) or complementary matal-oxide semiconductor (Complementary Metal-Oxide Semiconductor, CMOS) two kinds, and because the manufacture of semiconductor development of technology; Make the picture element area of photosensory assembly dwindle; The miniaturization phtographic lens is the development toward high picture element field gradually, therefore, and to the also increase day by day of requirement of image quality.
Common mobile lens adopts the three-chip type lens combination more, and lens combination is born second lens of refracting power and the 3rd lens of the positive refracting power of a tool from thing side to first lens, the tool that as side are the positive refracting power of a tool in regular turn, like USP 7,145, shown in 736.
When the picture element area of photosensory assembly dwindles gradually, system improves the requirement of image quality, and common three-chip type lens combination can't satisfy more the phtographic lens module of high-order and use.
USP 7,365, and 920 have disclosed a kind of four-piece type lens combination; But wherein first lens and second lens become Doublet with mutual bonding of two sheet glass spherical mirrors; In order to color difference eliminating, but the method has its shortcoming, one of which; Too much glass spherical mirror configuration makes degree of freedom in system not enough, causes the optics total length of system to be difficult for shortening; Its two, the processing procedure that glass mirror binds is difficult for, and causes the difficulty in the manufacturing.
Summary of the invention
Technical matters to be solved by this invention provides a kind of four-piece imaging lens system, with the image quality of lifting optical system, and effectively shortens the lens combination volume.
For solving the problems of the technologies described above, four-piece imaging lens system of the present invention is the imaging lens group that is made up of four lens, is extremely comprised in regular turn as side by the thing side: first lens of the positive refracting power of a tool; Second lens of the negative refracting power of one tool; The 3rd lens of the negative refracting power of one tool, its front surface is a convex surface, the surface, back is a concave surface; The 4th lens of the negative refracting power of one tool, it is provided with aspheric surface; In the four-piece imaging lens system, the lens of tool refracting power are merely four; Through by above-mentioned eyeglass configuration mode, the effectively image quality of elevator system.
In the four-piece imaging lens system of the present invention; The refracting power of system is mainly provided by first lens of the positive refracting power of tool; The function of second lens of the negative refracting power of tool is mainly the correction aberration; And the 3rd lens and the 4th lensing such as revisal lens, its function is balance and each item aberration that update the system produced; In addition, the 3rd lens and the 4th lens are the negative refracting power of tool all, makes the principal point of system away from imaging surface, can effectively shorten the optics total length of four-piece imaging lens system.
By first lens powerful positive refracting power is provided, and aperture is placed the object side near four-piece imaging lens system, can effectively shorten the optics total length of four-piece imaging lens system; In addition; Above-mentioned configuration can make the outgoing pupil (Exit Pupil) of four-piece imaging lens system away from imaging surface, and therefore, light will be incident on the mode near vertical incidence on the photosensory assembly; This is the heart far away (Telecentric) characteristic of imaging side; Heart characteristic far away is very important for the photoperceptivity of solid-state electronic photosensory assembly at present, and with making the sensitization susceptibility of sense electronics optical assembly improve, the minimizing system produces the possibility at dark angle; In addition, the 3rd lens and the 4th lens are provided with the point of inflexion, and the light of more effectively suppressing from the axle visual field is incident on the angle on the photosensory assembly.
In addition, in wide-angle optics, need do correction to distorting (Distortion) and multiplying power look receipts poor (Chromatic Aberration of Magnification) especially, its method is for to place system light flexion equilibrium of forces place with aperture; The present invention then focuses on the characteristic of the heart far away if aperture is placed before first lens, and the optics total length of four-piece imaging lens system can be shorter; If aperture is placed between first lens and second lens, then focus on the characteristic of Wide-angle; Simultaneously, so configuration of aperture position can effectively reduce the susceptibility of system.
Along with the trend of lens of photographic mobile phone miniaturization, and system need contain visual angle widely, makes the focal length of optical system become very short; In this case, it is very little that the radius-of-curvature of eyeglass and lens dimension all become, and will be difficult to produce above-mentioned eyeglass with the traditional glass abrasive method; Therefore; On eyeglass, adopt plastic material,, can use eyeglass than less cost production high precision through making eyeglass by the mode of ejection formation; And being provided with aspheric surface in minute surface, aspheric surface can be made into the shape beyond the sphere easily, obtains more control variable, in order to subduing aberration, and then the number of reduction eyeglass use, can effectively shorten the optics total length of four-piece imaging lens system thus.
In the four-piece imaging lens system of the present invention, the focal length of whole four-piece imaging lens system is f, and the focal length of the 3rd lens is f3, and its relation is:
|f/f3|＜0.5；
When f/f3 satisfies the note relation that goes up; The 3rd lensing is as the revisal lens; Its function is balance and each item aberration that update the system produced, will help revising the astigmatism (Astigmatism) of four-piece imaging lens system and distorts, and improves the resolving power of four-piece imaging lens system; Further, note concerns then comparatively desirable to make f/f3 satisfy down:
|f/f3|＜0.2。
In the four-piece imaging lens system of the present invention, the abbe number of first lens (Abbe Number) is V1, and the abbe number of second lens is V2, and its relation is:
25.2＜V1-V2＜35.0；
When V1 and the satisfied note relation that goes up of V2, can effectively revise the aberration (ChromaticAberration) of four-piece imaging lens system, improve the image quality of four-piece imaging lens system; Further, note concerns then comparatively desirable to make V1 and V2 satisfy down:
30.6＜V1-V2＜34.0；
V2＜25.0。
In the four-piece imaging lens system of the present invention, the focal length of whole four-piece imaging lens system is f, and the mirror spacing between second lens and the 3rd lens is T23, and its relation is:
(T23/f)*100＞3.5；
Go up the note relation when T23/f satisfies, will help revising the higher order aberratons of four-piece imaging lens system.
In the four-piece imaging lens system of the present invention, be provided with the point of inflexion, then the effective aberration of modified off-axis visual field in the second lens front surface.
In the four-piece imaging lens system of the present invention, the front surface radius-of-curvature of second lens is R3, and the back surface curvature radius of second lens is R4, and its relation is:
R3/R4＞3.0；
Go up limit value under the note relation when R3/R4 is lower than, the aberration that four-piece imaging lens system produces will be difficult to revise.
In the four-piece imaging lens system of the present invention, the mirror spacing of first lens and second lens is T12, and the focal length of whole four-piece imaging lens system is f, and it concerns as follows:
0.6＜(T12/f)*100＜5.0；
When T12/f satisfies the ability that the note relation can effectively promote imaging lens group correction higher order aberratons that goes up.
In the four-piece imaging lens system of the present invention, first index of refraction in lens is N1, and its relation is:
1.50＜N1＜1.58；
When N1 satisfy to go up the note relation, its refractive index is comparatively good between the coupling of the optical plastic material of this scope and four-piece imaging lens system.
In the four-piece imaging lens system of the present invention, the front surface radius-of-curvature of the 3rd lens is R5, and the back surface curvature radius of the 3rd lens is R6, and the front surface radius-of-curvature of the 4th lens is R7, and the back surface curvature radius of the 4th lens is R8, and its relation is:
1.1＜R5/R6＜1.3；
1.1＜R7/R8＜1.3；
Go up the note relation and can make the 3rd lens and the 4th lensing such as revisal lens when R5/R6 and R7/R8 satisfy, help the higher order aberratons of update the system, the lifting image quality.
In the four-piece imaging lens system of the present invention, the object of this four-piece imaging lens system images on the sense electronics optical assembly, and the optics total length of four-piece imaging lens system is TTL, and the imaging of four-piece imaging lens system highly is ImgH, and its relation is:
TTL/ImgH＜1.95。
When satisfying, TTL/ImgH goes up the characteristic that the note relation can be kept the four-piece imaging lens system miniaturization.
In sum, owing to adopt said lens structure, arrangement mode and eyeglass configuration, the present invention can effectively dwindle mirror group volume, reduce the susceptibility of optical system, more can obtain higher resolving power simultaneously.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Figure 1A is the optical system synoptic diagram of the embodiment of the invention 1;
Figure 1B is the aberration curve figure of the embodiment of the invention 1;
Fig. 2 A is the optical system synoptic diagram of the embodiment of the invention 2;
Fig. 2 B is the aberration curve figure of the embodiment of the invention 2;
Fig. 3 A is the optical system synoptic diagram of the embodiment of the invention 3;
Fig. 3 B is the aberration curve figure of the embodiment of the invention 3;
Fig. 4 A is the optical system synoptic diagram of the embodiment of the invention 4;
Fig. 4 B is the aberration curve figure of the embodiment of the invention 4.
Wherein, in the above Reference numeral, first lens 10, front surface 11, surface, back 12, the second lens 20; Front surface 21, surface, back 22, the three lens 30, front surface 31, surface, back 32, the four lens 40; Front surface 41, surface, back 42, aperture 50, infrared ray filtering optical filter 60, imaging surface 70.
In addition, among the present invention, the focal distance f of whole four-piece imaging lens system; Focal distance f 3, the first lens of the 3rd lens and the mirror spacing T12 between second lens, the mirror spacing T23 between second lens and the 3rd lens; First index of refraction in lens N1, the first lens abbe number V1, the second lens abbe number V2; The front surface radius of curvature R 5 of back surface curvature radius R 4, the three lens of front surface radius of curvature R 3, the second lens of second lens; The back surface curvature radius R 8 of front surface radius of curvature R 7, the four lens of back surface curvature radius R 6, the four lens of the 3rd lens; The optics total length TTL of four-piece imaging lens system, the imaging height ImgH of four-piece imaging lens system.
Embodiment
Embodiment 1
Embodiment 1 consults Figure 1A, and the aberration curve of embodiment 1 is consulted Figure 1B, and the four-piece imaging lens system in the present embodiment is extremely comprised as side by the thing side in regular turn:
The 3rd lens 30 of the negative refracting power of one tool; Its material is plastics, and the front surface 31 of the 3rd lens 30 is a convex surface, and surface, back 32 is a concave surface; The front surface 31 of the 3rd lens 30 all is provided with aspheric surface with surface, back 32 in addition, and the front surface 31 of the 3rd lens 30 all is provided with the point of inflexion with surface, back 32;
The 4th lens 40 of the negative refracting power of one tool; Its material is plastics, and the front surface 41 of the 4th lens 40 is a convex surface, and surface, back 42 is a concave surface; The front surface 41 of the 4th lens 40 all is provided with aspheric surface with surface, back 42 in addition, and the front surface 41 of the 4th lens 40 all is provided with the point of inflexion with surface, back 42;
One aperture 50 places before first lens 10;
One infrared ray filtering optical filter (IR Filter) 60 places after the 4th lens 40, and it does not influence the focal length of system;
One imaging surface 70 places after the infrared ray filtering optical filter 60.
The equation of above-mentioned aspheric curve is represented as follows:
Wherein:
X: be the point of Y apart from optical axis on the aspheric surface, itself and the relative height that is tangential on the tangent plane on summit on the aspheric surface optical axis;
Y: the point on the aspheric curve is apart from the distance of optical axis;
K: conical surface coefficient;
Ai: i rank asphericity coefficient.
Among the embodiment 1, the focal length of whole four-piece imaging lens system is f, and the focal length of the 3rd lens is f3, and its relation is: f=3.67mm;
|f/f3|＝0.05。
Among the embodiment 1, the focal length of whole four-piece imaging lens system is f, and the mirror spacing between first lens and second lens is T12, and the mirror spacing between second lens and the 3rd lens is T23, and its relation is:
(T12/f)*100＝2.0；
(T23/f)*100＝18.6。
Among the embodiment 1, first index of refraction in lens N1=1.544.
Among the embodiment 1, the first lens abbe number (Abbe Number) is V1, and the second lens abbe number is V2, and its relation is:
V2＝23.4；
V1-V2＝32.5。
Among the embodiment 1; The front surface radius-of-curvature of second lens is R3, and the back surface curvature radius of second lens is R4, and the front surface radius-of-curvature of the 3rd lens is R5; The back surface curvature radius of the 3rd lens is R6; The front surface radius-of-curvature of the 4th lens is R7, and the back surface curvature radius of the 4th lens is R8, and its relation is:
R3/R4＝14.52；
R5/R6＝1.16；
R7/R8＝1.22。
Among the embodiment 1, this four-piece imaging lens system object images on the sense electronics optical assembly, and the optics total length of four-piece imaging lens system is TTL, and the imaging of four-piece imaging lens system highly is ImgH, and its relation is: TTL/ImgH=1.76.
The detailed structured data of embodiment 1 is as shown in the table 1, and its aspherical surface data is as shown in the table 2, and wherein, the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as the half the of maximum visual angle.
Structured data among table 1 embodiment 1
Aspherical surface data among table 2 embodiment 1
Embodiment 2
Embodiment 2 consults Fig. 2 A, and the aberration curve of embodiment 2 is consulted Fig. 2 B, and the four-piece imaging lens system in the present embodiment is extremely comprised as side by the thing side in regular turn:
The 3rd lens 30 of the negative refracting power of one tool; Its material is plastics, and the front surface 31 of the 3rd lens 30 is a convex surface, and surface, back 32 is a concave surface; The front surface 31 of the 3rd lens 30 all is provided with aspheric surface with surface, back 32 in addition, and the front surface 31 of the 3rd lens 30 all is provided with the point of inflexion with surface, back 32;
The 4th lens 40 of the negative refracting power of one tool; Its material is plastics, and the front surface 41 of the 4th lens 40 is a convex surface, and surface, back 42 is a concave surface; The front surface 41 of the 4th lens 40 all is provided with aspheric surface with surface, back 42 in addition, and the front surface 41 of the 4th lens 40 all is provided with the point of inflexion with surface, back 42;
One aperture 50 places before first lens 10;
One infrared ray filtering optical filter (IR Filter) 60 places after the 4th lens 40, and it does not influence the focal length of system;
One imaging surface 70 places after the infrared ray filtering optical filter 60.
The equational expression of the aspheric curve of embodiment 2 is as the pattern of embodiment 1.
Among the embodiment 2, the focal length of whole four-piece imaging lens system is f, and the focal length of the 3rd lens is f3, and its relation is: f=3.36mm;
|f/f3|＝0.10。
Among the embodiment 2, the focal length of whole four-piece imaging lens system is f, and the mirror spacing between first lens and second lens is T12, and the mirror spacing between second lens and the 3rd lens is T23, and its relation is:
(T12/f)*100＝8.5；
(T23/f)*100＝13.2。
Among the embodiment 2, first index of refraction in lens N1=1.544.
Among the embodiment 2, the first lens abbe number (Abbe Number) is V1, and the second lens abbe number is V2, and its relation is:
V2＝23.4；
V1-V2＝32.5。
Among the embodiment 2; The front surface radius-of-curvature of second lens is R3, and the back surface curvature radius of second lens is R4, and the front surface radius-of-curvature of the 3rd lens is R5; The back surface curvature radius of the 3rd lens is R6; The front surface radius-of-curvature of the 4th lens is R7, and the back surface curvature radius of the 4th lens is R8, and its relation is:
R3/R4＝0.50；
R5/R6＝1.24；
R7/R8＝1.21。
Among the embodiment 2, this four-piece imaging lens system object images on the sense electronics optical assembly, and the optics total length of four-piece imaging lens system is TTL, and the imaging of four-piece imaging lens system highly is ImgH, and its relation is: TTL/ImgH=1.66.
Among the embodiment 2, detailed structured data is as shown in the table 3, and its aspherical surface data is as shown in the table 4, and wherein, the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as the half the of maximum visual angle.
Structured data among table 3 embodiment 2
Aspherical surface data among table 4 embodiment 2
Embodiment 3
Embodiment 3 sees also Fig. 3 A, and the aberration curve of embodiment 3 is consulted Fig. 3 B, and the four-piece imaging lens system in the present embodiment is extremely comprised as side by the thing side in regular turn:
The 3rd lens 30 of the negative refracting power of one tool; Its material is plastics, and the front surface 31 of the 3rd lens 30 is a convex surface, and surface, back 32 is a concave surface; The front surface 31 of the 3rd lens 30 all is provided with aspheric surface with surface, back 32 in addition, and the front surface 31 of the 3rd lens 30 all is provided with the point of inflexion with surface, back 32;
The 4th lens 40 of the negative refracting power of one tool; Its material is plastics, and the front surface 41 of the 4th lens 40 is a convex surface, and surface, back 42 is a concave surface; The front surface 41 of the 4th lens 40 all is provided with aspheric surface with surface, back 42 in addition, and the front surface 41 of the 4th lens 40 all is provided with the point of inflexion with surface, back 42;
One aperture 50 places between first lens 10 and second lens 20;
One infrared ray filtering optical filter (IR Filter) 60 places after the 4th lens 40, and it does not influence the focal length of system;
One imaging surface 70 places after the infrared ray filtering optical filter 60.
The equational expression of the aspheric curve of embodiment 3 is as the pattern of embodiment 1.
Among the embodiment 3, the focal length of whole four-piece imaging lens system is f, and the focal length of the 3rd lens is f3, and its relation is: f=3.34mm;
|f/f3|＝0.05。
Among the embodiment 3, the focal length of whole four-piece imaging lens system is f, and the mirror spacing between first lens and second lens is T12, and the mirror spacing between second lens and the 3rd lens is T23, and its relation is:
(T12/f)*100＝11.1；
(T23/f)*100＝14.9。
Among the embodiment 3, first index of refraction in lens N1=1.544.
Among the embodiment 3, the first lens abbe number (Abbe Number) is V1, and the second lens abbe number is V2, and its relation is:
V2＝30.2；
V1-V2＝25.7。
Among the embodiment 3; The front surface radius-of-curvature of second lens is R3, and the back surface curvature radius of second lens is R4, and the front surface radius-of-curvature of the 3rd lens is R5; The back surface curvature radius of the 3rd lens is R6; The front surface radius-of-curvature of the 4th lens is R7, and the back surface curvature radius of the 4th lens is R8, and its relation is:
R3/R4＝0.65；
R5/R6＝1.13；
R7/R8＝1.18。
Among the embodiment 3, this four-piece imaging lens system object images on the sense electronics optical assembly, and the optics total length of four-piece imaging lens system is TTL, and the imaging of four-piece imaging lens system highly is ImgH, and its relation is: TTL/ImgH=1.63.
Detailed structured data among the embodiment 3 is as shown in the table 5, and its aspherical surface data is as shown in the table 6, and wherein, the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as the half the of maximum visual angle.
Structured data among table 5 embodiment 3
Aspherical surface data among table 6 embodiment 3
Embodiment 4
Embodiment 4 consults Fig. 4 A, and the aberration curve of embodiment 4 is consulted Fig. 4 B, and the four-piece imaging lens system in the present embodiment is extremely comprised as side by the thing side in regular turn:
The 3rd lens 30 of the negative refracting power of one tool; Its material is plastics, and the front surface 31 of the 3rd lens 30 is a convex surface, and surface, back 32 is a concave surface; The front surface 31 of the 3rd lens 30 all is provided with aspheric surface with surface, back 32 in addition, and the front surface 31 of the 3rd lens 30 all is provided with the point of inflexion with surface, back 32;
The 4th lens 40 of the negative refracting power of one tool; Its material is plastics, and the front surface 41 of the 4th lens 40 is a convex surface, and surface, back 42 is a concave surface; The front surface 41 of the 4th lens 40 all is provided with aspheric surface with surface, back 42 in addition, and the front surface 41 of the 4th lens 40 all is provided with the point of inflexion with surface, back 42;
One aperture 50 places between first lens 10 and second lens 20;
One infrared ray filtering optical filter (IR Filter) 60 places after the 4th lens 40, and it does not influence the focal length of system;
One imaging surface 70 places after the infrared ray filtering optical filter 60.
The equational expression of the aspheric curve of embodiment 4 is as the pattern of embodiment 1.
Among the embodiment 4, the focal length of whole four-piece imaging lens system is f, and the focal length of the 3rd lens is f3, and its relation is: f=3.75mm;
|f/f3|＝0.10。
Among the embodiment 4, the focal length of whole four-piece imaging lens system is f, and the mirror spacing between first lens and second lens is T12, and the mirror spacing between second lens and the 3rd lens is T23, and its relation is:
(T12/f)*100＝1.3；
(T23/f)*100＝17.8。
Among the embodiment 4, first index of refraction in lens N1=1.544.
Among the embodiment 4, the first lens abbe number (Abbe Number) is V1, and the second lens abbe number is V2, and its relation is:
V2＝23.4；
V1-V2＝32.5。
Among the embodiment 4; The front surface radius-of-curvature of second lens is R3, and the back surface curvature radius of second lens is R4, and the front surface radius-of-curvature of the 3rd lens is R5; The back surface curvature radius of the 3rd lens is R6; The front surface radius-of-curvature of the 4th lens is R7, and the back surface curvature radius of the 4th lens is R8, and its relation is:
R3/R4＝17.87；
R5/R6＝1.22；
R7/R8＝1.23。
Among the embodiment 4, this four-piece imaging lens system object images on the sense electronics optical assembly, and the optics total length of four-piece imaging lens system is TTL, and the imaging of four-piece imaging lens system highly is ImgH, and its relation is: TTL/ImgH=1.75.
Detailed structured data among the embodiment 4 is as shown in the table 7, and its aspherical surface data is as shown in the table 8, and wherein, the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as the half the of maximum visual angle.
Structured data among table 7 embodiment 4
Aspherical surface data among table 8 embodiment 4
In four-piece imaging lens system of the present invention, the material of lens can be glass or plastics, if the material of lens is a glass, then can increase the degree of freedom of system's refracting power configuration, if the lens material is plastics, then can effectively reduce production costs.
In addition; Table 1 to table 8 is depicted as the different numerical value change tables of four-piece imaging lens system embodiment; The all true gained of testing of the numerical value change of each embodiment of the present invention; Even use different numerical value, the product of same structure must belong to protection category of the present invention, and table 9 is the numerical data of the corresponding correlate equation of the present invention of each embodiment.
The numerical data of the corresponding correlate equation of the present invention of each embodiment of table 9
In sum, four-piece imaging lens system of the present invention, mirror group volume can be effectively dwindled in scioptics structure, arrangement mode and eyeglass configuration, more can obtain higher resolving power simultaneously.
What need explanation is in the four-piece type imaging lens set of the present invention, if lens surface is a convex surface, to represent that then this lens surface is a convex surface in dipped beam axle place; If lens surface is a concave surface, represent that then this lens surface is a concave surface in dipped beam axle place.
Claims (21)
1. miniaturization four-piece imaging lens system that is applied to camera cell phone is characterized in that: by the thing side to comprising in regular turn as side:
First lens of the positive refracting power of one tool, the first lens front surface is all aspheric surface with the surface, back;
Second lens of the negative refracting power of one tool, the second lens front surface is all aspheric surface with the surface, back;
The 3rd lens of the negative refracting power of one tool, its front surface is a convex surface, surface, back be a concave surface, the 3rd lens front surface with after the surface be all aspheric surface, and front surface and after the surface all be provided with the point of inflexion; And
The 4th lens of the negative refracting power of one tool, its front surface is a convex surface, surface, back be a concave surface, the 4th lens front surface with after the surface be all aspheric surface, and front surface and after the surface all be provided with the point of inflexion; In the four-piece imaging lens system, the lens of tool refracting power are merely four;
Said four-piece imaging lens system object images on the sense electronics optical assembly, and the optics total length of four-piece imaging lens system is TTL, and the imaging of four-piece imaging lens system highly is ImgH, and its relation is: TTL/ImgH＜1.95.
2. be applied to the miniaturization four-piece imaging lens system of camera cell phone according to claim 1, it is characterized in that: the said first lens front surface is a convex surface, and the 3rd lens and the 4th lens are all plastic material.
3. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 2, it is characterized in that: the said second lens front surface is that the surface is concave surface behind the convex surface.
4. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 3, it is characterized in that: said first lens are plastic material, and second lens are plastic material; Four-piece imaging lens system is provided with an aperture in addition, and this aperture places before second lens.
5. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 4, it is characterized in that: the said second lens front surface is provided with the point of inflexion.
6. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 3, it is characterized in that: the focal length of said four-piece imaging lens system is f, and the focal length of the 3rd lens is f3, and its relation is: | f/f3|＜0.5.
7. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 6, it is characterized in that: the focal length of said four-piece imaging lens system is f, and the focal length of the 3rd lens is f3, and its relation is: | f/f3|＜0.2.
8. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 4, it is characterized in that: the said first lens abbe number is V1, and the second lens abbe number is V2, and its relation is: 25.2＜V1-V2＜35.0.
9. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 8, it is characterized in that: the said first lens abbe number is V1, and the second lens abbe number is V2, and its relation is:
30.6＜V1-V2＜34.0；
V2＜25.0。
10. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 3, it is characterized in that: the focal length of said four-piece imaging lens system is f, and the mirror spacing between second lens and the 3rd lens is T23, and its relation is:
(T23/f)*100＞3.5。
11. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 3, it is characterized in that: the front surface radius-of-curvature of said second lens is R3, the back surface curvature radius of second lens is R4, and its relation is: R3/R4＞3.0.
12. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 3, it is characterized in that: the focal length of said four-piece imaging lens system is f, the mirror spacing between first lens and second lens is T12, and its relation is:
0.6＜(T12/f)*100＜5.0。
13. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 4, it is characterized in that: said first index of refraction in lens is N1, and its relation is: 1.50＜N1＜1.58.
14. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 4; It is characterized in that: the front surface radius-of-curvature of said the 3rd lens is R5; The back surface curvature radius of the 3rd lens is R6; The front surface radius-of-curvature of the 4th lens is R7, and the back surface curvature radius of the 4th lens is R8, and its relation is:
1.1＜R5/R6＜1.3；
1.1＜R7/R8＜1.3。
15. a miniaturization four-piece imaging lens system that is applied to camera cell phone is characterized in that: extremely comprise in regular turn as side by the thing side:
First lens of the positive refracting power of one tool, the first lens front surface is a convex surface, the first lens front surface is all aspheric surface with the surface, back;
Second lens of the negative refracting power of one tool, the second lens front surface is a concave surface, and the surface, back is a convex surface, and the second lens front surface is all aspheric surface with the surface, back, and front surface is provided with the point of inflexion;
The 3rd lens of the negative refracting power of one tool, the 3rd lens front surface is a convex surface, surface, back be a concave surface, the 3rd lens are plastic material, the 3rd lens front surface with after the surface be all aspheric surface, and front surface and after the surface all be provided with the point of inflexion; And
The 4th lens of the negative refracting power of one tool, the 4th lens front surface is a convex surface, surface, back be a concave surface, the 4th lens are plastic material, the 4th lens front surface with after the surface be all aspheric surface, and front surface and after the surface all be provided with the point of inflexion; In the four-piece imaging lens system, the lens of tool refracting power are merely four;
Said four-piece imaging lens system object images on the sense electronics optical assembly, and the optics total length of four-piece imaging lens system is TTL, and the imaging of four-piece imaging lens system highly is ImgH, and its relation is: TTL/ImgH＜1.95.
16. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 15, it is characterized in that: said first lens are plastic material, second lens are plastic material.
17. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 15, it is characterized in that: the focal length of said four-piece imaging lens system is f, the focal length of the 3rd lens is f3, and its relation is: | f/f3|＜0.2.
18. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 15, it is characterized in that: the focal length of said four-piece imaging lens system is f, the mirror spacing between second lens and the 3rd lens is T23, and its relation is:
(T23/f) * 100＞3.5; Mirror spacing between first lens and second lens is T12, and its relation is: (T12/f) * 100＞0.6.
19. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 16, it is characterized in that: the said first lens abbe number is V1, and the second lens abbe number is V2, and its relation is:
25.2＜V1-V2＜35.0；
V2＜25.0。
20. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 16; It is characterized in that: the front surface radius-of-curvature of said the 3rd lens is R5; The back surface curvature radius of the 3rd lens is R6; The front surface radius-of-curvature of the 4th lens is R7, and the back surface curvature radius of the 4th lens is R8, and its relation is:
1.1＜R5/R6＜1.3；
1.1＜R7/R8＜1.3。
21. like the said miniaturization four-piece imaging lens system that is applied to camera cell phone of claim 15, it is characterized in that: said four-piece imaging lens system is provided with an aperture in addition, this aperture places before these second lens.
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| CN102466864B (en) * | 2010-11-15 | 2014-03-26 | 大立光电股份有限公司 | Optical photographic system |
| TWI431355B (en) * | 2011-05-16 | 2014-03-21 | Largan Precision Co Ltd | Optical image lens assembly |
| CN106154515B (en) * | 2016-03-18 | 2019-02-01 | 玉晶光电(厦门)有限公司 | Optical mirror slip group |
| CN106154493B (en) * | 2016-03-18 | 2019-03-22 | 玉晶光电(厦门)有限公司 | Optical mirror slip group |
| CN112882211B (en) * | 2021-01-18 | 2021-12-07 | 广东烨嘉光电科技股份有限公司 | Large-aperture four-piece optical lens |
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