CN201562070U - Lens group - Google Patents
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- CN201562070U CN201562070U CN200920273311XU CN200920273311U CN201562070U CN 201562070 U CN201562070 U CN 201562070U CN 200920273311X U CN200920273311X U CN 200920273311XU CN 200920273311 U CN200920273311 U CN 200920273311U CN 201562070 U CN201562070 U CN 201562070U
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Abstract
A lens group disposed between an object side and an imaging surface comprises a first lens, a second lens, a third lens and a fourth lens, wherein the curvature radius of the first lens is R1 and R2, the curvature radius of the second lens is R3 and R4, the curvature radius of the third lens is R5 and R6, and the curvature radius of the fourth lens is R7 and R8. The curvature radiuses respectively meet a relation including 2.5<R1/R2<17.8, -3.11<R3/R4<-0.26, -1.72<R5/R6<-0.95 and -1.36<R7/R8<-1.14, and simultaneously relations of a distance between the first lens and the imaging surface and all air clearances D2, D4, D6 and D8 between the first lens and the imaging surface meet a relation including 1.3< (D2+D4+D6+D8)/D<1.5. By the aids of structure arrangement, disposition relation between the object side and the imaging surface, curvature radius and arrangement distance of each lens, the lens group leads rays coming from the object side to greatly decrease deformation degree of image edges formed on the imaging surface after corrected and adjusted via each lens.
Description
Technical field
The utility model relates to a kind of lens combination, particularly a kind of lens combination that is applied to phtographic lens.
Background technology
Recently along with the fast development of electronics technology, various electronic products with camera function are widely used in the daily life.For example digital camera (digital camera), computer cameras, network camera, mobile phone, personal digital assistant (personal digital assistant, PDA), vehicle monitoring system (as bicycle recording apparatus (tachograph) or reverse image system) and supervisory system etc. at home.And, in response to user's demand in the use, have in the electronic product of camera function at these, all possess the camera function that wide-angle or super wide-angle are arranged usually.
As being example with the present supervisory system that generally is installed on the automobile, general supervisory system includes a camera lens, an image sensor, a micro computer processing unit and a screen.Its principle is to receive the extraneous light that comes from object side by camera lens, and light is passed to image one-tenth survey device (imaging side) generation image.Then, with the image that produced via the micro computer processing unit processes after, be shown on the screen again.Wherein,, therefore generally can adopt wide-angle lens, can have wide-angle or super wide-angle monitoring capacity, and reduce the quantity that is provided with of camera lens greater than 130 degree to guarantee supervisory system for the monitoring range that makes supervisory system have wide-angle.
Yet the composition material of set lens is generally glass in this wide-angle lens at present.And forming on the structure, be arranged with the 6th lens of the 3rd lens, the 4th lens and the 5th lens and the double concave type of first lens of falcate and second lens, biconvex from object side to imaging side in regular turn.Wherein, the 6th lens are to be glued on the 5th lens, and each lens is all spherical mirror.This wide-angle lens is the light that receives wide-angle by first lens, to reach the purpose of wide-angleization.And when light penetration to the five lens, utilize the 6th lens to be glued at the 5th lens distortion is reduced, but its distortion distribution trend still is little near the place, lens center, big near the rims of the lens place.Afterwards, after will coming from the light focusing of the 5th lens and reduce aberration via the 6th lens again, image in image sensor.
Though above-mentioned wide-angle lens has the image capture ability of wide-angleization, but in practical application, the resolving power that the image energy that presents in order to make on the screen has the wide-angle function simultaneously and is enough to identification, it must increase the resolving power of overall image via the processing of the 5th lens by the degree of distortion of sacrificing image edge.Therefore, cause image to be subjected to distortion effects easily and produce the problem of serious distortion distortion (for example making image), and then the edge images that wide-angle lens is captured is lost recognizable effect towards both sides stretcher strain.
The utility model content
In view of above problem, the utility model provides a kind of lens combination, so as to improving existing wide-angle lens institute picked image marginal existence excessive distortion is arranged, and causes overall image to be enough to the problem of the image of identification because of torsional deformation can't provide the user.
To achieve these goals, the utility model discloses a kind of lens combination, be arranged at an object side and an imaging surface between, it is characterized in that this lens combination is included from this imaging surface by this object side in regular turn along an optical axis:
One first lens have one first minute surface and one second minute surface, and this first minute surface has a positive curvature radius R 1, and this second minute surface has a positive curvature radius R 2, and satisfies following relationship formula: 2.5＜R1/R2＜17.8;
One second lens have one the 3rd minute surface and one the 4th minute surface, and the 3rd minute surface has a negative curvature radius R 3, the four minute surfaces and has a positive curvature radius R 4, and satisfies following relationship formula :-3.11＜R3/R4＜-0.26;
One the 3rd lens have one the 5th minute surface and one the 6th minute surface, and the 5th minute surface has a positive curvature radius R 5, the six minute surfaces and has a negative curvature radius R 6, and satisfies following relationship formula :-1.72＜R5/R6＜-0.95; And
One the 4th lens have one the 7th minute surface and one the 8th minute surface, and the 7th minute surface has a positive curvature radius R 7, the eight minute surfaces and has a negative curvature radius R 8, and satisfies following relationship formula :-1.36＜R7/R8＜-1.14;
Wherein, on this optical axis, this first minute surface to this imaging surface has a thickness D, this first minute surface to this second minute surface has a thickness D1, this second minute surface to the 3rd minute surface has a thickness D2, the 3rd minute surface to the 4th minute surface has a thickness D3, the 4th minute surface to the 5th minute surface has a thickness D4, the 5th minute surface to the 6th minute surface has a thickness D5, the 6th minute surface to the 7th minute surface has a thickness D6, the 7th minute surface to the 8th minute surface has a thickness D7 and the 8th minute surface to this imaging surface has a thickness D8, this thickness D is the summation of this thickness D1 to this thickness D8, and satisfies following relationship formula: 1.3＜(D2+D4+D6+D8)/D＜1.5.
Above-mentioned lens combination, it is characterized in that, this positive curvature radius R 1 and this positive curvature radius R 2 satisfy following relationship formula: 17＜R1/R2＜17.8, this negative curvature radius R 3 and this positive curvature radius R 4 satisfy following relationship formula :-3.1＜R3/R4＜-2.9, and this positive curvature radius R 5 and this negative curvature radius R 6 satisfy following relationship formula :-0.98＜R5/R6＜-0.95 and this positive curvature radius R 7 and this negative curvature radius R 8 and satisfy following relationship formula :-1.15＜R7/R8＜-1.14.
Above-mentioned lens combination is characterized in that, this thickness D, this thickness D2, this thickness D4, this thickness D6 and this thickness D8 satisfy following relationship formula: 1.4＜(D2+D4+D6+D8)/D＜1.5.
Above-mentioned lens combination, it is characterized in that, this thickness D1 and this thickness D2 satisfy following relationship formula: 0.22＜D1/D2＜0.23, this thickness D3 and this thickness D4 satisfy following relationship formula: 0.3＜D3/D4＜0.33, and this thickness D5 and this thickness D6 satisfy following relationship formula: 0.9＜D5/D6＜1.0 and this thickness D7 and this thickness D8 and satisfy following relationship formula: 0.41＜D7/D8＜0.43.
Above-mentioned lens combination is characterized in that, these first lens, these second lens, the 3rd lens and the 4th lens are aspheric mirror.
Above-mentioned lens combination is characterized in that, these first lens are glass material spare, and these second lens, the 3rd lens and the 4th lens are plastic material spare.
Above-mentioned lens combination, it is characterized in that, also comprise one the 5th lens between these first lens and this second lens, the 5th lens have one the 9th minute surface and 1 the tenth minute surface, the 9th minute surface has a positive curvature radius R 9, the tenth minute surface has a positive curvature radius R 10, and satisfies following relationship formula: 2.2＜R9/R10＜2.3.
Above-mentioned lens combination, it is characterized in that, this positive curvature radius R 1 and this positive curvature radius R 2 satisfy following relationship formula: 2.55＜R1/R2＜2.6, this negative curvature radius R 3 and this positive curvature radius R 4 satisfy following relationship formula :-0.265＜R3/R4＜-0.26, and this positive curvature radius R 5 and this negative curvature radius R 6 satisfy following relationship formula :-1.72＜R5/R6＜-1.7 and this positive curvature radius R 7 and this negative curvature radius R 8 and satisfy following relationship formula :-1.36＜R7/R8＜-1.3.
Above-mentioned lens combination, it is characterized in that, on this optical axis, this second minute surface to the 9th minute surface has a thickness D9, the 9th minute surface to the tenth minute surface has a thickness D10 and the tenth minute surface to the 3rd minute surface has a thickness D11, and this thickness D, this thickness D9, this thickness D11, this thickness D4, this thickness D6 and this thickness D8 satisfy following relational expression: 1.5＜(D9+D11+D4+D6+D8)/D＜1.55.
Above-mentioned lens combination, it is characterized in that, this thickness D1 and this thickness D9 satisfy following relationship formula: 0.7＜D1/D9＜0.8, this thickness D10 and this thickness D11 satisfy following relationship formula: 0.35＜D10/D11＜0.4, this thickness D3 and this thickness D4 satisfy following relationship formula: 2＜D3/D4＜3, and this thickness D5 and this thickness D6 satisfy following relationship formula: 1.6＜D5/D6＜1.7 and this thickness D7 and this thickness D8 and satisfy following relationship formula: 0.21＜D7/D8＜0.23.
Above-mentioned lens combination is characterized in that, these first lens are spherical mirror, and the 5th lens, these second lens, the 3rd lens and the 4th lens are aspheric mirror.
Above-mentioned lens combination is characterized in that, these first lens are glass material spare, and these second lens, the 3rd lens, the 4th lens and the 5th lens are plastic material spare.
Effect of the present utility model is, the disclosed lens combination of the utility model, by each lens in object side and the configuration relation between the imaging surface, and cooperate the structure setting of each lens, and radius-of-curvature that each minute surface had and each other spread length, make lens combination receive the light of wide-angle and to have the function of wide-angleization by first lens.And, after making the light that comes from object side be subjected to the correction of each lens and adjusting, can significantly be reduced to the distortion degree of formed image edge on the forming face by the reciprocation between each lens, increase the resolving power and the discrimination power of overall image effectively.
Below in conjunction with the drawings and specific embodiments the utility model is described in detail, but not as to qualification of the present utility model.
Description of drawings
Fig. 1 is the combination synoptic diagram of first embodiment of the present utility model;
Fig. 2 is the light path synoptic diagram of first embodiment of the present utility model;
Fig. 3 is the image distortion synoptic diagram of first embodiment of the present utility model;
Fig. 4 is the combination synoptic diagram of second embodiment of the present utility model;
Fig. 5 is the light path synoptic diagram of second embodiment of the present utility model; And
Fig. 6 is the image distortion synoptic diagram of second embodiment of the present utility model.
Wherein, Reference numeral
The thickness of D1 first minute surface to the second minute surface
The thickness of D2 second minute surface to the three minute surfaces
The thickness of D3 the 3rd minute surface to the four minute surfaces
The thickness of D4 the 4th minute surface to the five minute surfaces
The thickness of D5 the 5th minute surface to the six minute surfaces
The thickness of D6 the 6th minute surface to the seven minute surfaces
The thickness of D7 the 7th minute surface to the eight minute surfaces
D8 the 8th minute surface is to the thickness of imaging surface
The thickness of D9 second minute surface to the nine minute surfaces
The thickness of D10 the 9th minute surface to the ten minute surfaces
The thickness of D11 the tenth minute surface to the three minute surfaces
D first minute surface is to the thickness of imaging surface
The E1 image edge
The E2 image edge
L1 first lens
L2 second lens
L3 the 3rd lens
L4 the 4th lens
L5 the 5th lens
The P imaging surface
S1 first minute surface
S2 second minute surface
S3 the 3rd minute surface
S4 the 4th minute surface
S5 the 5th minute surface
S6 the 6th minute surface
S7 the 7th minute surface
S8 the 8th minute surface
S9 the 9th minute surface
S10 the tenth minute surface
The Z optical axis
Embodiment
Below in conjunction with accompanying drawing structural principle of the present utility model and principle of work are done concrete description:
See also Fig. 1, the disclosed lens combination of first embodiment of the present utility model is to be applied in the phtographic lens (not shown), and is disposed between the imaging surface P of an object side and an imaging side.Lens combination is included to imaging surface P by object side in regular turn along optical axis Z: one first lens L1, one second lens L2, one the 3rd lens L3 and one the 4th lens L4.
The first lens L1 is the meniscus shaped lens (meniscus) of an aspheric surface (aspherical surface).The first lens L1 has one first minute surface S1 and one second minute surface S2.The first minute surface S1 has a positive curvature radius R 1, the second minute surface and has another positive curvature radius R 2, and satisfies following relationship formula: 2.5＜R1/R2＜17.8.And on same optical axis Z, first minute surface S1 to the second minute surface S2 has a thickness D1, and the first minute surface S1 has a thickness D (not shown) to imaging surface P.
The second lens L2 is aspheric double concave lens (biconcave).The second lens L2 has one the 3rd minute surface S3 and one the 4th minute surface S4.The 3rd minute surface S3 has a negative curvature radius R 3, the four minute surfaces and has a positive curvature radius R 4, and satisfies following relationship formula :-3.11＜R3/R4＜-0.26.Simultaneously, on optical axis Z, the second minute surface S2 to the, the three minute surface S3 of the first lens L1 have a thickness D2, and the 3rd minute surface S3 to the four minute surface S4 have a thickness D3.
The 3rd lens L3 is aspheric lenticular lens (biconvex).The 3rd lens L3 has one the 5th minute surface S5 and one the 6th minute surface S6.The 5th minute surface S5 has a positive curvature radius R 5, the six minute surface S6 and has a negative curvature radius R 6, and satisfies following relationship formula :-1.72＜R5/R6＜-0.95.And on optical axis Z, the 4th minute surface S4 to the five minute surface S5 of the second lens L2 have a thickness D4, and the 5th minute surface S5 to the six minute surface S6 have a thickness D5.
The 4th lens L4 is another aspheric lenticular lens.The 4th lens L4 has one the 7th minute surface S7 and one the 8th minute surface S8.The 7th minute surface S7 has a positive curvature radius R 7, the eight minute surface S8 and has a negative curvature radius R 8, and satisfies following relationship formula :-1.36＜R7/R8＜-1.14.And on optical axis Z, the 6th minute surface S6 to the seven minute surface S7 of the 3rd lens L3 have a thickness D6, the 7th minute surface S7 to the eight minute surface S8 and have a thickness D7 and the 8th minute surface S8 and have a thickness D8 to imaging surface P.
Wherein, thickness D1, thickness D3, thickness D5 and thickness D7 are respectively the thickness of the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4, thickness D2, thickness D4, thickness D6 are the clearance between lens and the lens, and thickness D8 then is the clearance between the 4th lens L4 and the imaging surface P.
Therefore, on optical axis, the thickness D that the first minute surface S1 is had to imaging surface P is equal to the summation of thickness D1 to thickness D8, and satisfies following relationship formula: 1.3＜(D2+D4+D6+D8)/D＜1.5.
In addition, the composition material of the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 can be glass or plastics.In present embodiment, formed by glass material with the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 by the plastic material composition as illustrating, but not as limit.
And, the aspherical shape of the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4, can represent by following equation I:
Wherein, Z is the z axial translation (with respect to the summit of lens surface) at height and position x place, x is the vertical height (as eyeglass height) of arbitrfary point to the optical axis on the minute surface, k is circular cone coefficient (conic constant), r is the radius-of-curvature of lens, and A, B, C, D, E, F are respectively the asphericity coefficient (aspherical coefficient) of second order, quadravalence, six rank, eight rank, ten rank and ten second orders.
In the present embodiment, the concrete numerical value of following now tabulation one and table two illustrates as present embodiment, but not as limit.
As shown in Table 1, for lens combination by object side between the imaging surface, the radius-of-curvature of the arrangement position of first lens (L1), second lens (L2), the 3rd lens (L3) and the 4th lens (L4), the first minute surface S1 to the, eight minute surface S8 (clearance (thickness D2, D4 and D6) between thickness (being thickness D1, D3, D5 and the D7 of each lens), lens and the lens between R1～R8), each minute surface and the clearance (thickness D8) between the 4th lens and the imaging surface.Wherein, the dimensional units of radius-of-curvature and thickness is a millimeter (mm).
Table one
Therefore, in lens combination, the positive curvature radius R 1 of the first minute surface S1 and the positive curvature radius R 2 of second minute surface satisfy following relationship formula: 17＜R1/R2＜17.8; The negative curvature radius R 3 of the 3rd minute surface and the positive curvature radius R 4 of the 4th minute surface satisfy following relationship formula :-3.1＜R3/R4＜-2.9; The positive curvature radius R 5 of the 5th minute surface and the negative curvature radius R 6 of the 6th minute surface satisfy following relationship formula :-0.98＜R5/R6＜-0.95; And the negative curvature radius R 8 of the positive curvature radius R 7 of the 7th minute surface and the 8th minute surface satisfies following relationship formula :-1.15＜R7/R8＜-1.14.
Simultaneously, thickness D1 and thickness D2 satisfy following relationship formula: 0.22＜D1/D2＜0.23; Thickness D3 and thickness D4 satisfy following relationship formula: 0.3＜D3/D4＜0.33; Thickness D5 and thickness D6 satisfy following relationship formula: 0.9＜D5/D6＜1.0; And thickness D7 and thickness D8 satisfy following relationship formula: 0.41＜D7/D8＜0.43.And thickness D, thickness D2, thickness D4, thickness D6 and thickness D8 satisfy following relationship formula: 1.4＜(D2+D4+D6+D8)/D＜1.5.
As shown in Table 2, be the asphericity coefficient of each stratum of the first minute surface S1 to the, eight minute surface S8 among the equation I.Wherein, the circular cone coefficient of equation I is zero (K=0).
Table two
Please consult Fig. 1 and Fig. 2 simultaneously, the lens combination of forming based on the concrete data of above-mentioned table one and table two, when extraneous light when object side enters the first lens L1, because the first lens L1 is a meniscus shaped lens, and be accompanied by the configuration relation of the radius-of-curvature of the first minute surface S1 and the second minute surface S2, light that can incident angle is big receives to the first lens L1 from the first minute surface S1, and is converted to the less light of angle and reaches the effect of wide-angleization.Afterwards, the light penetration second minute surface S2 that angle is less, and be subjected to the adjustment of the second minute surface S2 to the light course, make the past off-centring of course near the light of the second minute surface S2 center, and the course of the light that is positioned at the second minute surface S2 outer rim is offset outward, and light is passed to the second lens L2.
The second lens L2 is double concave lens, when the 3rd minute surface S3 of the light penetration second lens L2 that comes from the first lens L1 and the 4th minute surface S4, can be subjected to the adjustment of the 3rd minute surface S3 and the 4th minute surface S4, and the course that makes light further near the center position of the second lens L2 toward off-centring; And be offset outward near the outer rim place of the second lens L2.Afterwards, be passed to the 3rd lens L3 again.
When light when the second lens L2 transmits and penetrate the 3rd lenticular lens L3, with light focusing and after reducing aberration, again light is passed to the 4th lens L4 via the 5th minute surface S5 and the 6th minute surface S6.Because the 4th lens L4 is similarly lenticular lens, therefore can via the 7th minute surface S7 and the 8th minute surface S8 once more focused ray and reduce aberration after, make the light transmission and image in imaging surface P.At this moment, the image that is presented on imaging surface P is the wide-angle image of wide-angle.And, please cooperate Fig. 3, the distortion that is produced in image edge E1, E2 can effectively obtain to releive, and meaning promptly reduces the degreeof tortuosity at image edge place, to reduce the degree of deformation of overall image.
Therefore, the disclosed lens combination of present embodiment, by the configuration relation of the first lens L1 to the, four lens L4 between object side and imaging surface P, and cooperate the structure setting of the radius-of-curvature of the first minute surface S1 to the, eight minute surface S8, the wide-angle function that lens combination is had to receive high angle scattered light, and make the light that comes from object side after correction and adjustment via lens combination, can reduce the deformation extent of the distortion degree and the image integral body of the image edge that forms in imaging surface P significantly, and then improve the discrimination power of image.
As shown in Figure 4, be the combination synoptic diagram of second embodiment of the present utility model.The disclosed lens combination of second embodiment of the present utility model is to be disposed between the imaging surface P of an object side and an imaging side.Lens combination is included to imaging surface P by object side in regular turn along optical axis Z: one first lens L1, one the 5th lens L5, one second lens L2, one the 3rd lens L3 and one the 4th lens L4.
The first lens L1 is the meniscus shaped lens of a sphere.The first lens L1 has one first minute surface S1 and one second minute surface S2.The first minute surface S1 has a positive curvature radius R 1, the second minute surface and has another positive curvature radius R 2, and satisfies following relationship formula: 2.55＜R1/R2＜2.6.And on optical axis Z, first minute surface S1 to the second minute surface S2 has a thickness D1, and the first minute surface S1 has a thickness D (not shown) to imaging surface P.
The 5th lens L5 is an aspheric meniscus shaped lens.The 5th lens L5 has one the 9th minute surface S9 and 1 the tenth minute surface S10.The 9th minute surface has a positive curvature radius R 9, the ten minute surface S10 and has another positive curvature radius R 10, and satisfies following relationship formula: 2.2＜R9/R10＜2.3.And on optical axis Z, the second minute surface S2 to the, the nine minute surface S9 of the first lens L1 have a thickness D9, and the 9th minute surface S9 to the ten minute surface S10 have a thickness D10.
The second lens L2 is aspheric double concave lens.The second lens L2 has one the 3rd minute surface S3 and one the 4th minute surface S4.The 3rd minute surface S3 has a negative curvature radius R 3, the four minute surfaces and has a positive curvature radius R 4, and satisfies following relationship formula :-0.265＜R3/R4＜-0.26.Simultaneously, on optical axis Z, the tenth minute surface S10 to the three minute surface S3 of the 5th lens L5 have a thickness D11, and the 3rd minute surface S3 to the four minute surface S4 have a thickness D3.In addition, the second minute surface S2 to the, the three minute surface S3 of the first lens L1 have a thickness D2 (not shown), and thickness D2 is equal to the sum total of thickness D9, thickness D10 and thickness D11.
The 3rd lens L3 is aspheric lenticular lens (biconvex).The 3rd lens L3 has one the 5th minute surface S5 and one the 6th minute surface S6.The 5th minute surface S5 has a positive curvature radius R 5, the six minute surface S6 and has a negative curvature radius R 6, and satisfies following relationship formula :-1.72＜R5/R6＜-1.7.And on optical axis Z, the 4th minute surface S4 to the five minute surface S5 of the second lens L2 have a thickness D4, and the 5th minute surface S5 to the six minute surface S6 have a thickness D5.
The 4th lens L4 is another aspheric lenticular lens.The 4th lens L4 has one the 7th minute surface S7 and one the 8th minute surface S8.The 7th minute surface S7 has a positive curvature radius R 7, the eight minute surface S8 and has a negative curvature radius R 8, and satisfies following relationship formula :-1.36＜R7/R8＜-1.3.And on optical axis Z, the 6th minute surface S6 to the seven minute surface S7 of the 3rd lens L3 have a thickness D6, the 7th minute surface S7 to the eight minute surface S8 and have a thickness D7 and the 8th minute surface S8 and have a thickness D8 to imaging surface P.
Wherein, thickness D1, thickness D10, thickness D3, thickness D5 and thickness D7 are respectively the thickness of the first lens L1, the 5th lens L5, the second lens L2, the 3rd lens L3 and the 4th lens L4, thickness D9, thickness D11, thickness D4, thickness D6 are the clearance between lens and the lens, and thickness D8 then is the clearance between the 4th lens L4 and the imaging surface P.
Therefore, on optical axis, the thickness D that the first minute surface S1 is had to imaging surface P is equal to the summation of thickness D1 to thickness D11, and satisfies following relationship formula: 1.5＜(D9+D11+D4+D6+D8)/D＜1.55; Or satisfy following relationship formula: 1.3＜(D9+D10+D11+D4+D6+D8)/D＜1.4.Simultaneously, thickness D1 and thickness D9 satisfy following relationship formula: 0.7＜D1/D9＜0.8, thickness D10 and thickness D11 satisfy following relationship formula: 0.35＜D10/D11＜0.4, thickness D3 and thickness D4 satisfy following relationship formula: 2＜D3/D4＜3, and thickness D5 and thickness D6 satisfy following relationship formula: 1.6＜D5/D6＜1.7 and thickness D7 and thickness D8 and satisfy following relationship formula: 0.21＜D7/D8＜0.23.
In addition, the composition material of the first lens L1, the second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 can be glass or plastics.In present embodiment, formed by glass material with the first lens L1, the second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 by the plastic material composition as illustrating, but not as limit.
And the aspherical shape of the first lens L1, the second lens L2, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 also can be represented by the equation I of the first above-mentioned embodiment.Wherein, first lens (L1), the 5th lens (L5), second lens (L2), the 3rd lens (L3) and the arrangement position of the 4th lens (L4) between lens combination and imaging surface P, the radius-of-curvature of the first minute surface S1 to the, ten minute surface S10 (R1～R10), the thickness of each minute surface (thickness D1, D10, D3, D5 and D7), clearance between lens and the lens (thickness D9, D11, D4 and D6), the asphericity coefficient of each stratum of clearance between the 4th lens L4 and the imaging surface P (thickness D8) and the first minute surface S1 to the, ten minute surface S10 etc., the concrete numerical value of following now tabulation three and table four illustrates as present embodiment, but not as limit.
Table three
Table four
Please consult Fig. 4 and Fig. 5 simultaneously, based on above-mentioned structure, when extraneous light when object side enters the first lens L1 of lens combination, configuration relation by the radius-of-curvature of the first minute surface S1 and the second minute surface S2, light that can incident angle is big receives to the first lens L1 from the first minute surface S1, and be converted to the less light of angle, and have the effect of wide-angleization.Afterwards, the light penetration second minute surface S2 of this process angular setting, and be passed to the 5th lens L5.
Because the 5th lens L5 also is a meniscus shaped lens, can will receive in the 5th lens L5 by the still big light of angle behind the first lens L1 by the 9th minute surface S9, and be converted to the less light of angle, and then be passed to the second lens L2 via the tenth minute surface S10.When light penetration the tenth minute surface S10, the course of light can be subjected to the adjustment of the tenth minute surface S10, make the past off-centring of course, and the course of the light that is positioned at the tenth minute surface S10 outer rim is offset outward near the light of the tenth minute surface S10 center.
When light is passed to the second lens L2, the course that makes light via the 3rd minute surface S3 and the 4th minute surface S4 further near the center position of the second lens L2 toward off-centring; And after the outer rim place near the second lens L2 is offset outward, be passed to the 3rd lens L3 again.Afterwards, the light that comes from the second lens L2 is to penetrate the 3rd lens L3 and the 4th lens L4 in regular turn.In this process, light is subjected to the focussing force of the 5th minute surface S5, the 6th minute surface S6, the 7th minute surface S7 and the 8th minute surface S8 in regular turn and reduces aberration.At last, light penetration the 8th minute surface S8 also is passed to imaging surface P, with the wide-angle image that forms a wide-angle on imaging surface P.And, therefore can effectively reduce distortion (distortion) degree (as shown in Figure 6) of image edge E1, E2, and improve the discrimination power of image because light has been subjected to the adjustment of each lens.
The disclosed lens combination of the utility model by each lens in object side and the configuration relation between the imaging surface, and cooperates the radius-of-curvature that minute surface had and the thickness of each lens, the wide-angle function that lens combination is had can receive high angle scattered light.And, make the light that comes from object side via after the correction of lens combination and adjusting by the reciprocation of each lens, and significantly reduce the distortion degree at the image edge place after being shaped, keeping the resolving power of overall image, and improve the discrimination power of image.
Certainly; the utility model also can have other various embodiments; under the situation that does not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the utility model.
Claims (12)
1. a lens combination is arranged between an object side and the imaging surface, it is characterized in that this lens combination is included from this imaging surface by this object side in regular turn along an optical axis:
One first lens have one first minute surface and one second minute surface, and this first minute surface has a positive curvature radius R 1, and this second minute surface has a positive curvature radius R 2, and satisfies following relationship formula: 2.5＜R1/R2＜17.8;
One second lens have one the 3rd minute surface and one the 4th minute surface, and the 3rd minute surface has a negative curvature radius R 3, the four minute surfaces and has a positive curvature radius R 4, and satisfies following relationship formula :-3.11＜R3/R4＜-0.26;
One the 3rd lens have one the 5th minute surface and one the 6th minute surface, and the 5th minute surface has a positive curvature radius R 5, the six minute surfaces and has a negative curvature radius R 6, and satisfies following relationship formula :-1.72＜R5/R6＜-0.95; And
One the 4th lens have one the 7th minute surface and one the 8th minute surface, and the 7th minute surface has a positive curvature radius R 7, the eight minute surfaces and has a negative curvature radius R 8, and satisfies following relationship formula :-1.36＜R7/R8＜-1.14;
Wherein, on this optical axis, this first minute surface to this imaging surface has a thickness D, this first minute surface to this second minute surface has a thickness D1, this second minute surface to the 3rd minute surface has a thickness D2, the 3rd minute surface to the 4th minute surface has a thickness D3, the 4th minute surface to the 5th minute surface has a thickness D4, the 5th minute surface to the 6th minute surface has a thickness D5, the 6th minute surface to the 7th minute surface has a thickness D6, the 7th minute surface to the 8th minute surface has a thickness D7 and the 8th minute surface to this imaging surface has a thickness D8, this thickness D is the summation of this thickness D1 to this thickness D8, and satisfies following relationship formula: 1.3＜(D2+D4+D6+D8)/D＜1.5.
2. lens combination according to claim 1, it is characterized in that, this positive curvature radius R 1 and this positive curvature radius R 2 satisfy following relationship formula: 17＜R1/R2＜17.8, this negative curvature radius R 3 and this positive curvature radius R 4 satisfy following relationship formula :-3.1＜R3/R4＜-2.9, and this positive curvature radius R 5 and this negative curvature radius R 6 satisfy following relationship formula :-0.98＜R5/R6＜-0.95 and this positive curvature radius R 7 and this negative curvature radius R 8 and satisfy following relationship formula :-1.15＜R7/R8＜-1.14.
3. lens combination according to claim 2 is characterized in that, this thickness D, this thickness D2, this thickness D4, this thickness D6 and this thickness D8 satisfy following relationship formula: 1.4＜(D2+D4+D6+D8)/D＜1.5.
4. lens combination according to claim 2, it is characterized in that, this thickness D1 and this thickness D2 satisfy following relationship formula: 0.22＜D1/D2＜0.23, this thickness D3 and this thickness D4 satisfy following relationship formula: 0.3＜D3/D4＜0.33, and this thickness D5 and this thickness D6 satisfy following relationship formula: 0.9＜D5/D6＜1.0 and this thickness D7 and this thickness D8 and satisfy following relationship formula: 0.41＜D7/D8＜0.43.
5. lens combination according to claim 2 is characterized in that, these first lens, these second lens, the 3rd lens and the 4th lens are aspheric mirror.
6. lens combination according to claim 5 is characterized in that, these first lens are glass material spare, and these second lens, the 3rd lens and the 4th lens are plastic material spare.
7. lens combination according to claim 1, it is characterized in that, also comprise one the 5th lens between these first lens and this second lens, the 5th lens have one the 9th minute surface and 1 the tenth minute surface, the 9th minute surface has a positive curvature radius R 9, the tenth minute surface has a positive curvature radius R 10, and satisfies following relationship formula: 2.2＜R9/R10＜2.3.
8. lens combination according to claim 7, it is characterized in that, this positive curvature radius R 1 and this positive curvature radius R 2 satisfy following relationship formula: 2.55＜R1/R2＜2.6, this negative curvature radius R 3 and this positive curvature radius R 4 satisfy following relationship formula :-0.265＜R3/R4＜-0.26, and this positive curvature radius R 5 and this negative curvature radius R 6 satisfy following relationship formula :-1.72＜R5/R6＜-1.7 and this positive curvature radius R 7 and this negative curvature radius R 8 and satisfy following relationship formula :-1.36＜R7/R8＜-1.3.
9. lens combination according to claim 7, it is characterized in that, on this optical axis, this second minute surface to the 9th minute surface has a thickness D9, the 9th minute surface to the tenth minute surface has a thickness D10 and the tenth minute surface to the 3rd minute surface has a thickness D11, and this thickness D, this thickness D9, this thickness D11, this thickness D4, this thickness D6 and this thickness D8 satisfy following relational expression: 1.5＜(D9+D11+D4+D6+D8)/D＜1.55.
10. lens combination according to claim 9, it is characterized in that, this thickness D1 and this thickness D9 satisfy following relationship formula: 0.7＜D1/D9＜0.8, this thickness D10 and this thickness D11 satisfy following relationship formula: 0.35＜D10/D11＜0.4, this thickness D3 and this thickness D4 satisfy following relationship formula: 2＜D3/D4＜3, and this thickness D5 and this thickness D6 satisfy following relationship formula: 1.6＜D5/D6＜1.7 and this thickness D7 and this thickness D8 and satisfy following relationship formula: 0.21＜D7/D8＜0.23.
11. lens combination according to claim 7 is characterized in that, these first lens are spherical mirror, and the 5th lens, these second lens, the 3rd lens and the 4th lens are aspheric mirror.
12. lens combination according to claim 11 is characterized in that, these first lens are glass material spare, and these second lens, the 3rd lens, the 4th lens and the 5th lens are plastic material spare.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920273311XU CN201562070U (en) | 2009-11-25 | 2009-11-25 | Lens group |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920273311XU CN201562070U (en) | 2009-11-25 | 2009-11-25 | Lens group |
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| CN201562070U true CN201562070U (en) | 2010-08-25 |
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| CN200920273311XU Expired - Lifetime CN201562070U (en) | 2009-11-25 | 2009-11-25 | Lens group |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102566009A (en) * | 2010-12-09 | 2012-07-11 | 大立光电股份有限公司 | Wide-angle optical lens assembly |
| CN104459837A (en) * | 2014-11-18 | 2015-03-25 | 南京联河讯光电科技有限责任公司 | Second lens for minitype combined optical system |
| WO2022016456A1 (en) * | 2020-07-23 | 2022-01-27 | 欧菲光集团股份有限公司 | Optical system, image capturing module, and electronic device |
-
2009
- 2009-11-25 CN CN200920273311XU patent/CN201562070U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102566009A (en) * | 2010-12-09 | 2012-07-11 | 大立光电股份有限公司 | Wide-angle optical lens assembly |
| CN102566009B (en) * | 2010-12-09 | 2014-03-12 | 大立光电股份有限公司 | Wide-angle optical lens assembly |
| CN104459837A (en) * | 2014-11-18 | 2015-03-25 | 南京联河讯光电科技有限责任公司 | Second lens for minitype combined optical system |
| WO2022016456A1 (en) * | 2020-07-23 | 2022-01-27 | 欧菲光集团股份有限公司 | Optical system, image capturing module, and electronic device |
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