CN105487202B - The four-piece type optical shooting lens and its imaging method for the angle of visual field of being grown up with short mirror - Google Patents
The four-piece type optical shooting lens and its imaging method for the angle of visual field of being grown up with short mirror Download PDFInfo
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- CN105487202B CN105487202B CN201511027803.7A CN201511027803A CN105487202B CN 105487202 B CN105487202 B CN 105487202B CN 201511027803 A CN201511027803 A CN 201511027803A CN 105487202 B CN105487202 B CN 105487202B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
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Abstract
Grown up the four-piece type optical shooting lens of the angle of visual field with short mirror the present invention relates to a kind of, including sequentially arranged from the object side to image side along camera lens optical axis aperture diaphragm, the first lens L1 with positive diopter, there is the second lens L2 for bearing diopter, the 3rd lens L3 with positive diopter, with the 4th lens L4, optical filter and the image acquisition element for bearing diopter；The invention further relates to it is a kind of with short mirror grow up the angle of visual field four-piece type optical shooting lens imaging method.The present invention can effectively shorten camera lens overall length, reduce system sensitivity, and can obtain good image quality；In addition, each simple easy to manufacture of lens face type, tolerance is more loose, substantially reduces production cost.
Description
Technical field
Grown up the four-piece type optical shooting lens and its imaging method of the angle of visual field with short mirror the present invention relates to a kind of.
Background technology
With the development of science and technology optical shooting lens are sent out towards directions such as short and small, high-resolution, the big angle of visual field and low costs
Exhibition, in terms of electronic product, such as：Optical shooting lens are all in occupation of half river in digital camera, mobile phone, personal digital assistance
Mountain.
Applied to the sampling image lens of small-sized electronic product, have at present after three lens types, four lens types and five lens types with
On different designs.At present, the sampling image lens of three lens types are eliminated substantially, the sampling image lens of five lens types and the above from into
As for quality perspective, more lens type optical image-fetching lens relatively have excellent in lens error correction, optical transfer function MTF performances
Gesture, it can be used in the electronic product of high pixel request, but camera lens overall length is oversize, this is unfavorable for using on ultra thin handset.
At difference between the structure design of the optical shooting lens of existing four-piece type or technical characteristic, then be decided by it is following it is various because
The change or combination of element, convex/recessed direction such as corresponding matching between four lens is different, to reach light incidence and outgoing
Angle adjustment；Or four related datas between lens, such as the spacing TC between focal length EFL, each optical surfacei, each optical surface curvature Ri
Deng to meet different conditions respectively.
In practical, have shorter mirror is long, lens error correction is good, high pixel, low cost to be designed as user urgent
Demand.
The content of the invention
In view of the deficiencies in the prior art, the technical problems to be solved by the invention are to provide a kind of reasonable in design, real
Grown up the four-piece type optical shooting lens and its imaging method of the angle of visual field with the short mirror that has of, low cost.
In order to solve the above-mentioned technical problem, the technical scheme is that：Four of a kind of angle of visual field of being grown up with short mirror
Formula optical shooting lens, including sequentially arrange from the object side to image side along camera lens optical axis aperture diaphragm, there is positive diopter
First lens L1, the second lens L2 with negative diopter, the 3rd lens L3 with positive diopter, with bearing the of diopter
Four lens L4, optical filter and image acquisition element.
Preferably, the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 are aspherical
Mirror, wherein the thing side of the first lens L1 is convex surface, the image side surface of the first lens L1 is concave surface, second lens
L2 thing side is concave surface, the image side surface of the second lens L2 is convex surface, and curved at the second lens L2 image side surface large aperture
To image side surface, the thing side of the 3rd lens L3 is concave surface, the image side surface of the 3rd lens L3 is convex surface, and the described 4th is saturating
Mirror L4 thing side and image side surface are in W fonts.
Preferably, on camera lens optical axis imaging surface of the thing side of the first lens L1 to image acquisition element distance
TTL, the first lens L1 and the second lens L2 center air are at intervals of ACT1, the second lens L2 and the 3rd lens L3
Center air at intervals of ACT2, the 3rd lens L3 and the 4th lens L4 center air at intervals of ACT3, it is the described 3rd saturating
Mirror L3 center thickness GCT3, the 3rd lens L3 edge thickness G ET3, the 4th lens L4 image side surface to image adopt
Integrate some distance with the imaging surface of image acquisition element of the imaging surface of element recently as BFL and overall optical image acquiring lens
The focal length EFL of group meets following relation：＜ (the ACT of 0.19 ＜ BFL/TTL ＜, 0.23,1.2 ＜ TTL/EFL ＜ 1.5,0.181+ACT2
+ACT3The ＜ GCT of)/EFL ＜ 0.45,0.443/GET3＜ 0.74.
Preferably, the focal length f of the first lens L11, the 3rd lens L3 focal length f3And overall optical image-taking
The focal length EFL of microscope group meets following relation：1.0 ＜ EFL/f1The ＜ EFL/f of ＜ 1.14,0.263＜ 0.47.
Preferably, the radius of curvature R 3 of the thing side of the second lens L2, the second lens L2 image side surface song
Rate radius R4 meets following relation：0.4 ＜ R3/R4 ＜ 1.1.
Preferably, the chief ray incidence angles CRA of described image acquisition elements, the effective pixel region of described image acquisition elements
The cornerwise half y in domain, the half w of overall angle of visual field and the first lens L1 thing side are to image acquisition element
The distance TTL of imaging surface meets following relation：The ＜ w/CRA ＜ 1.4 of 1.5 ＜ TTL/y ＜ 1.6,1.2.
Preferably, the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 are satisfied by with ShiShimonoseki
System：Z is aspherical rise in formula, and c is aspherical
Curvature, K is quadratic surface circular cone coefficient, and r is aspherical radial coordinate, A4、A6、A8... be respectively aspherical four, six,
Eight ... wait rank asphericity coefficient.
Preferably, the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 are less than by refractive index
1.65 plastic cement material is made, and the optical filter is made up of Schott-BK7 materials.
It is a kind of with short mirror grow up the angle of visual field four-piece type optical shooting lens imaging method, including any of the above-described kind have
There is short mirror to grow up the four-piece type optical shooting lens of the angle of visual field, comprise the steps of：
(1) light beam enters the first lens L1 by the aperture diaphragm, wherein the axle glazing by the first lens L1
Beam has the trend of convergence, and the light of big visual field has the bigger angle of emergence；
(2) second lens L2 of the light beam Jing Guo the high index of refraction, wherein central light beam further converge, and described second is saturating
Contrary flexure at mirror L2 image side surface heavy caliber causes the light of outermost visual field to gather, and can effectively control the spherical aberration and more of outermost visual field
Speckle；
(3) after the 3rd lens L3 of the light beam by the regular low refraction, each visual-field beam is uniformly distributed, laser beam smoothing
Transition, light beam can preferably correcting chromatic aberrations after the second lens L2, the 3rd lens L3；
(4) light beam converges to image acquisition element, the thing side of the 4th lens L4 after the 4th lens L4
It is in W fonts with image side surface, not only ensures chief ray incidence angles of each visual field on the imaging surface of image acquisition element as far as possible
It is small, and be effectively improved place and distortion aberration.
Compared with prior art, the invention has the advantages that：
(1) present invention is reasonable in design, can effectively correct aberration, increase the back focal length of camera lens, reduce the quick of system
Sensitivity so that camera lens is compacter so as to shorten overall length, and then lifts the application of the present invention；
(2) the first lens L1 of the invention, the 3rd lens L3, the 4th lens L4 are advantageous to subtract using same plastic material
Few material, reduces cost, and can reach bigger image height well；
(3) being configured with for lens spacing of the present invention is beneficial to assembling, and it is electric to be adapted to miniaturization further to shorten camera lens overall length
Sub-device；
(4) each simple easy to manufacture of lens face type of the present invention, tolerance is more loose, substantially reduces production cost.
The present invention will be further described in detail with reference to the accompanying drawings and detailed description.
Brief description of the drawings
Fig. 1 is the optical structure chart of the embodiment of the present invention one.
Fig. 2 is the longitudinal spherical aberration figure of the embodiment of the present invention one.
Fig. 3 is the curvature of field figure of the embodiment of the present invention one.
Fig. 4 is the distortion figure of the embodiment of the present invention one.
Fig. 5 is the optical structure chart of the embodiment of the present invention two.
Fig. 6 is the longitudinal spherical aberration figure of the embodiment of the present invention two.
Fig. 7 is the curvature of field figure of the embodiment of the present invention two.
Fig. 8 is the distortion figure of the embodiment of the present invention two.
Fig. 9 is the optical structure chart of the embodiment of the present invention three.
Figure 10 is the longitudinal spherical aberration figure of the embodiment of the present invention three.
Figure 11 is the curvature of field figure of the embodiment of the present invention three.
Figure 12 is the distortion figure of the embodiment of the present invention three.
Figure 13 is the optical structure chart of the embodiment of the present invention four.
Figure 14 is the longitudinal spherical aberration figure of the embodiment of the present invention four.
Figure 15 is the curvature of field figure of the embodiment of the present invention four.
Figure 16 is the distortion figure of the embodiment of the present invention four.
Figure 17 is the optical structure chart of the embodiment of the present invention five.
Figure 18 is the longitudinal spherical aberration figure of the embodiment of the present invention five.
Figure 19 is the curvature of field figure of the embodiment of the present invention five.
Figure 20 is the distortion figure of the embodiment of the present invention five.
In figure：The 3rd lens L3 of lens L2, L3- of the first lens of L1- L1, L2- second, L4- the 4th lens L4,5- aperture lights
Door screen, 6- optical filters, 7- image acquisition elements.
Embodiment
For features described above of the invention and advantage can be become apparent, special embodiment below, and coordinate accompanying drawing, make detailed
Carefully it is described as follows.
It is a kind of to be grown up the four-piece type optical shooting lens of the angle of visual field with short mirror as shown in Fig. 1~20, including along camera lens
The aperture diaphragm 5 that optical axis is sequentially arranged from the object side to image side, the first lens L1 with positive diopter, the with negative diopter
Two lens L2, the 3rd lens L3 with positive diopter, the 4th lens L4, optical filter 6 and image with negative diopter are adopted
Collect element 7；The aperture diaphragm 5 is that to belong to a kind of aperture preposition, can be realized when mechanism designs with picture frame；The optical filtering
Piece 6 can be made of BK7 or K9 glass, and its surface, which should be coated with, can allow the film layer of infrared cut of light；Described image acquisition elements 7 are wrapped
Containing CCD (charge coupled device) or CMOS (CMOS complementary metal-oxide-semiconductor), picture signal can be changed into electronic signal
Output；Being collocated with of the first lens L1 and this positive and negative diopters of the second lens L2 is beneficial to more preferable correcting chromatic aberration.
In embodiments of the present invention, the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 are equal
For non-spherical lens, wherein the thing side of the first lens L1 is convex surface, the image side surface of the first lens L1 is concave surface, institute
The thing side for stating the second lens L2 is concave surface, the image side surface of the second lens L2 is convex surface, and the second lens L2 image side surface
Bending towards image side surface at large aperture, the thing side of the 3rd lens L3 is concave surface, the image side surface of the 3rd lens L3 is convex surface,
The thing side of the 4th lens L4 and image side surface are in W fonts.
In embodiments of the present invention, on camera lens optical axis the first lens L1 thing side to image acquisition element 7 into
The distance TTL of image planes, the first lens L1 and the second lens L2 center air are at intervals of ACT1, the second lens L2 with
3rd lens L3 center air is at intervals of ACT2, the 3rd lens L3 and the 4th lens L4 center air at intervals of ACT3、
The center thickness GCT of the 3rd lens L33, the 3rd lens L3 edge thickness G ET3, the 4th lens L4 image side
Face to image acquisition element 7 imaging surface it is nearest a little and the distance of the imaging surface of image acquisition element 7 is BFL and whole
The focal length EFL of bulk optics capture microscope group meets following relation：The ＜ TTL/EFL ＜ 1.5 of 0.19 ＜ BFL/TTL ＜ 0.23,1.2,
0.18 ＜ (ACT1+ACT2+ACT3The ＜ GCT of)/EFL ＜ 0.45,0.443/GET3＜ 0.74.
In embodiments of the present invention, the focal length f of the first lens L11, the 3rd lens L3 focal length f3It is and whole
The focal length EFL of bulk optics capture microscope group meets following relation：1.0 ＜ EFL/f1The ＜ EFL/f of ＜ 1.14,0.263＜ 0.47.
In embodiments of the present invention, the radius of curvature R 3 of the thing side of the second lens L2, the second lens L2
The radius of curvature R 4 of image side surface meets following relation：0.4 ＜ R3/R4 ＜ 1.1.
In embodiments of the present invention, the chief ray incidence angles CRA of described image acquisition elements 7, described image acquisition elements 7
The cornerwise half y of effective pixel area, overall angle of visual field half w and the first lens L1 thing side to scheme
As the distance TTL of the imaging surface of acquisition elements 7 meets following relation：1.5 the ＜ w/CRA ＜ 1.4 of ＜ TTL/y ＜ 1.6,1.2.
In embodiments of the present invention, the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 are full
It is enough lower relation：Z is aspherical rise in formula, c
For aspherical curvature, K is quadratic surface circular cone coefficient, and r is aspherical radial coordinate, A4、A6、A8... it is aspherical respectively
Four, six, eight ... wait rank asphericity coefficient.
In embodiments of the present invention, the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 by
Plastic cement material of the refractive index less than 1.65 is made, and the optical filter 6 is made up of Schott-BK7 materials.
In embodiments of the present invention, it is a kind of with short mirror grow up the angle of visual field four-piece type optical shooting lens imaging side
Method, including any of the above-described kind there is short mirror to grow up the four-piece type optical shooting lens of the angle of visual field, comprise the steps of：
(1) light beam enters the first lens L1 by the aperture diaphragm 5, and the aperture diaphragm 5 is also the sampling image lens
Entrance pupil, the position of the aperture diaphragm 5 be convex surface against the first lens L1, the first lens L1 thing side, ensure to have compared with
The big angle of visual field, the image side surface of the first lens L1 is also convex surface, light beam on axle is had the trend of convergence,
The light of big visual field can be made have the bigger angle of emergence, and then ensure there is big image height；
(2) second lens L2 of the light beam Jing Guo the high index of refraction, wherein central light beam further converge, and described second is saturating
Contrary flexure at mirror L2 image side surface heavy caliber causes the light of outermost visual field to gather, and can effectively control the spherical aberration and more of outermost visual field
Speckle；
(3) after the 3rd lens L3 of the light beam by the regular low refraction, each visual-field beam is uniformly distributed, laser beam smoothing
Transition, the second lens L2, the 3rd lens L3 collocation can preferably correcting chromatic aberrations；
(4) light beam converges to image acquisition element 7, the thing side of the 4th lens L4 after the 4th lens L4
It is in W fonts with image side surface, not only ensures chief ray incidence angles of each visual field on the imaging surface of image acquisition element 7 as far as possible
It is small, and be effectively improved place and distortion aberration.
Show in the embodiment of the present invention one, in following table one and numbered by the optical surface of thing side to image side sequentially respectively
(Surface Number), the radius of curvature R i (units in the last optical surface of optical axis：mm)(The Radius of
Curvature R), the distance between each face d on optical axisi(unit：Mm) (The on-axis Surface Spacing), respectively
Refractive index (the Nd of lensi), Abbe number (Abbe ' s Number) Vd of each lensi。
Table one
In the embodiment of the present invention one, in Table 1, optical surface has dividing for aspherics face, R11, R12 for mark * person
The first lens L1 thing side and image side surface is not represented；R21, R22 represent the second lens L2 thing side and image side surface respectively；
R31, R32 represent the 3rd lens L3 thing side and image side surface respectively；R41, R42 represent respectively the 4th lens L4 thing side and
Image side surface, Fno are the focal distance ratio of optical lens, and EFL is the effective focal length of orientation camera lens, and 2w is the visual field of optical orientation camera lens
Angle；Following table two shows aspherical each term coefficient of each optical surface：
Table two
| K | A4 | A6 | A8 | A10 | A12 | A14 | A16 | |
| *R11 | 2.084E+00 | -9.799E-02 | -7.519E-01 | 3.822E+00 | -1.440E+01 | 1.946E+01 | 3.687E+00 | -2.586E+01 |
| *R12 | -1.507E+01 | -3.250E-01 | -8.317E-02 | -2.379E-01 | -2.140E+00 | 1.102E+01 | -1.837E+01 | 9.804E+00 |
| *R21 | -9.005E+00 | -9.588E-01 | 5.048E-01 | 7.224E-01 | 4.789E+00 | -1.123E+01 | 6.081E+00 | 4.198E-01 |
| *R22 | -1.694E+01 | 1.509E-01 | -1.496E+00 | 1.642E+00 | 5.548E+00 | -1.435E+01 | 1.313E+01 | -4.512E+00 |
| *R31 | -1.698E+01 | 9.131E-01 | -2.970E+00 | 3.875E+00 | 1.284E-01 | -6.414E+00 | 7.070E+00 | -2.536E+00 |
| *R32 | -9.227E-01 | 1.169E-01 | 1.228E-01 | -2.642E-01 | 1.526E-01 | 4.185E-02 | -3.579E-02 | -4.152E-03 |
| *R41 | -2.343E+00 | -4.366E-01 | 2.821E-01 | -9.734E-02 | 9.436E-03 | 7.029E-03 | -2.264E-03 | 1.019E-04 |
| *R42 | -8.281E-01 | -6.378E-01 | 5.101E-01 | -3.486E-01 | 1.630E-01 | -4.874E-02 | 8.213E-03 | -5.916E-04 |
In the embodiment of the present invention one, the first lens L1 is by refractive index Nd1For 1.54, Abbe number Vd1For 55.9 modeling
Glue material is made；The second lens L2 is by refractive index Nd2For 1.64, Abbe number Vd2It is made up of 22.4 plastic material；It is described
3rd lens L3 is by refractive index Nd3For 1.54, Abbe number Vd3It is made up of 55.9 plastic material；The 4th lens L4 is by reflecting
Nd4For 1.54, Abbe number Vd4It is made up of 55.9 plastic material；Optical filter 66 is made using BK7-SCHOTT glass materials.
In the embodiment of the present invention one, optical shooting lens effective focal length is 2.595, back focal length 0.794, and first is saturating
Mirror L1, the 3rd lens L3, the 4th lens L4 advantageously reduce material using same plastic material, reduce cost, and can be very well
Reach bigger image height, camera lens overall length is 3.605, that is, is met：＜ (the ACT of 0.19 ＜ BFL/TTL ＜ 0.23,0.181+ACT2+
ACT3The ＜ TTL/y ＜ 1.6 of)/EFL ＜ 0.45,1.5.
In the embodiment of the present invention one, above-mentioned material can prove that the optical shooting lens of the present invention can effectively correct picture
Difference so that camera lens is compacter so as to shorten overall length, and then lifts the application of the present invention.
Show in the embodiment of the present invention two, in following table three and numbered by the optical surface of thing side to image side sequentially respectively
(Surface Number), the radius of curvature R i (units in the last optical surface of optical axis：mm)(The Radius of
Curvature R), the distance between each face d on optical axisi(unit：Mm) (The on-axis Surface Spacing), respectively
Refractive index (the Nd of lensi), Abbe number (Abbe ' s Number) Vd of each lensi。
Table three
In the embodiment of the present invention two, in table three, optical surface (surface) have mark * person for aspherics face,
R11, R12 represent the first lens L1 thing side and image side surface respectively；R21, R22 represent respectively the second lens L2 thing side and
Image side surface；R31, R32 represent the 3rd lens L3 thing side and image side surface respectively；R41, R42 represent the 4th lens L4's respectively
Thing side and image side surface, Fno are the focal distance ratio of optical lens, and EFL is the effective focal length of orientation camera lens, and 2w is optical orientation camera lens
The angle of visual field；Following table two shows aspherical each term coefficient of each optical surface：
Table four
| K | A4 | A6 | A8 | A10 | A12 | A14 | A16 | |
| *R11 | 2.089E+00 | -1.010E-01 | -7.332E-01 | 3.882E+00 | -1.440E+01 | 1.901E+01 | 2.759E+00 | -2.273E+01 |
| *R12 | -1.502E+01 | -3.140E-01 | -1.115E-01 | -3.029E-01 | -2.098E+00 | 1.143E+01 | -1.798E+01 | 8.154E+00 |
| *R21 | -7.351E+00 | -9.581E-01 | 5.290E-01 | 7.292E-01 | 4.756E+00 | -1.131E+01 | 6.069E+00 | 4.462E-01 |
| *R22 | -1.557E+01 | 1.588E-01 | -1.502E+00 | 1.633E+00 | 5.541E+00 | -1.435E+01 | 1.312E+01 | -4.505E+00 |
| *R31 | -1.004E+01 | 9.117E-01 | -2.972E+00 | 3.862E+00 | 1.242E-01 | -6.415E+00 | 7.074E+00 | -2.550E+00 |
| *R32 | -8.644E-01 | 1.158E-01 | 1.126E-01 | -2.706E-01 | 1.508E-01 | 4.220E-02 | -3.551E-02 | -4.267E-03 |
| *R41 | -1.654E+00 | -4.442E-01 | 2.764E-01 | -9.884E-02 | 9.152E-03 | 7.063E-03 | -2.202E-03 | 1.417E-04 |
| *R42 | -8.429E-01 | -6.490E-01 | 5.125E-01 | -3.494E-01 | 1.629E-01 | -4.871E-02 | 8.222E-03 | -5.902E-04 |
In the embodiment of the present invention two, the first lens L1 is by refractive index Nd1For 1.54, Abbe number Vd1For 55.9 modeling
Glue material is made；The second lens L2 is by refractive index Nd2For 1.64, Abbe number Vd2It is made up of 22.4 plastic material；It is described
3rd lens L3 is by refractive index Nd3For 1.54, Abbe number Vd3It is made up of 55.9 plastic material；The 4th lens L4 is by reflecting
Nd4For 1.54, Abbe number Vd4It is made up of 55.9 plastic material；The optical filter 66 is made up of BK7-SCHOTT glass materials.
In the embodiment of the present invention two, optical shooting lens effective focal length is 2.595, back focal length 0.863；Thing side
R41 is have point of inflexion aspherical, and the first lens L1, the 3rd lens L3, the 4th lens L4 use same plastic cement material
Material advantageously reduces material, reduces cost, and can reach bigger image height well, and camera lens overall length is 3.654, that is, is met：
＜ (the ACT of 0.19 ＜ BFL/TTL ＜ 0.23,0.181+ACT2+ACT3The ＜ EFL/f of)/EFL ＜ 0.45,1.01The ＜ of ＜ 1.14,0.4
The ＜ w/CRA ＜ 1.4 of R3/R4 ＜ 1.1,1.2.
In the embodiment of the present invention two, above-mentioned material can prove that the optical shooting lens of the present invention can effectively correct picture
Difference, increase the back focal length of camera lens, reduce the susceptibility of system, and then lift the application of the present invention.
Show in the embodiment of the present invention three, in following table five and numbered by the optical surface of thing side to image side sequentially respectively
(Surface Number), the radius of curvature R i (units in the last optical surface of optical axis：mm)(The Radius of
Curvature R), the distance between each face d on optical axisi(unit：Mm) (The on-axis Surface Spacing), respectively
Refractive index (the Nd of lensi), Abbe number (Abbe ' s Number) Vd of each lensi。
Table five
In the embodiment of the present invention three, in table five, optical surface (Surface) have mark * person for aspherics face,
R11, R12 represent the first lens L1 thing side and image side surface respectively；R21, R22 represent respectively the second lens L2 thing side and
Image side surface；R31, R32 represent the 3rd lens L3 thing side and image side surface respectively；R41, R42 represent the 4th lens L4's respectively
Thing side and image side surface, Fno are the focal distance ratio of optical lens, and EFL is the effective focal length of orientation camera lens, and 2w is optical orientation camera lens
The angle of visual field；Following table six shows aspherical each term coefficient of each optical surface：
Table six
| K | A4 | A6 | A8 | A10 | A12 | A14 | A16 | |
| *R11 | 2.127E+00 | -9.598E-02 | -7.557E-01 | 3.838E+00 | -1.437E+01 | 1.931E+01 | 3.197E+00 | -2.431E+01 |
| *R12 | -1.501E+01 | -3.072E-01 | -9.915E-02 | -2.831E-01 | -2.162E+00 | 1.117E+01 | -1.823E+01 | 9.496E+00 |
| *R21 | -7.590E+00 | -9.455E-01 | 5.191E-01 | 6.709E-01 | 4.719E+00 | -1.119E+01 | 6.340E+00 | 2.219E-01 |
| *R22 | -1.514E+01 | 1.568E-01 | -1.501E+00 | 1.640E+00 | 5.547E+00 | -1.435E+01 | 1.312E+01 | -4.507E+00 |
| *R31 | -1.098E+01 | 9.340E-01 | -2.962E+00 | 3.863E+00 | 1.272E-01 | -6.410E+00 | 7.076E+00 | -2.555E+00 |
| *R32 | -1.005E+00 | 1.259E-01 | 1.155E-01 | -2.693E-01 | 1.516E-01 | 4.264E-02 | -3.566E-02 | -5.131E-03 |
| *R41 | -1.581E+00 | -4.404E-01 | 2.779E-01 | -9.860E-02 | 9.074E-03 | 7.016E-03 | -2.211E-03 | 1.409E-04 |
| *R42 | -8.381E-01 | -6.456E-01 | 5.129E-01 | -3.496E-01 | 1.629E-01 | -4.870E-02 | 8.219E-03 | -5.927E-04 |
In the embodiment of the present invention three, the first lens L1 is by refractive index Nd1For 1.54, Abbe number Vd1For 55.9 modeling
Glue material is made；The second lens L2 is by refractive index Nd2For 1.64, Abbe number Vd2It is made up of 22.4 plastic material；It is described
3rd lens L3 is by refractive index Nd3For 1.54, Abbe number Vd3It is made up of 55.9 plastic material；The 4th lens L4 is by reflecting
Nd4For 1.54, Abbe number Vd4It is made up of 55.9 plastic material；The optical filter 66 is made up of BK7-SCHOTT glass materials.
In the embodiment of the present invention three, the effective focal lengths of optical shooting lens is 2.619, back focal length 0.812；Thing side
R41 is have point of inflexion aspherical, and the first lens L1, the 3rd lens L3, the 4th lens L4 use same plastic cement material
Material advantageously reduces material, reduces cost, and can reach bigger image height well, and camera lens overall length is 3.638, that is, is met：
The ＜ EFL/f of 0.19 ＜ BFL/TTL ＜, 0.23,1.2 ＜ TTL/EFL ＜, 1.5,1.5 ＜ TTL/y ＜ 1.6,1.01The ＜ of ＜ 1.14,0.4
The ＜ EFL/f of R3/R4 ＜ 1.1,0.263The ＜ GCT of ＜ 0.47,0.443/GET3＜ 0.74.
In the embodiment of the present invention three, above-mentioned material can prove that the optical shooting lens of the present invention can effectively correct picture
Difference, being configured with beneficial to assembling for this lens spacing, further shortens camera lens overall length to be adapted to miniaturized electronic device.
Show in the embodiment of the present invention four, in following table seven and numbered by the optical surface of thing side to image side sequentially respectively
(Surface Number), the radius of curvature R i (units in the last optical surface of optical axis：mm)(The Radius of
Curvature R), the distance between each face d on optical axisi(unit：Mm) (The on-axis Surface Spacing), respectively
Refractive index (the Nd of lensi), Abbe number (Abbe ' s Number) Vd of each lensi。
Table seven
In the embodiment of the present invention four, in table seven, optical surface (surface) have mark * person for aspherics face,
R11, R12 represent the first lens L1 thing side and image side surface respectively；R21, R22 represent respectively the second lens L2 thing side and
Image side surface；R31, R32 represent the 3rd lens L3 thing side and image side surface respectively；R41, R42 represent the 4th lens L4's respectively
Thing side and image side surface, Fno are the focal distance ratio of optical lens, and EFL is the effective focal length of orientation camera lens, and 2w is optical orientation camera lens
The angle of visual field；In the embodiment of the present invention four, following table eight shows aspherical each term coefficient of each optical surface：
Table eight
In the embodiment of the present invention four, the first lens L1 is by refractive index Nd1For 1.54, Abbe number Vd1For 55.9 modeling
Glue material is made；All second lens L2 are by refractive index Nd2For 1.64, Abbe number Vd2It is made up of 22.4 plastic material；It is described
3rd lens L3 is by refractive index Nd3For 1.54, Abbe number Vd3It is made up of 55.9 plastic material；The 4th lens L4 is by reflecting
Nd4For 1.54, Abbe number Vd4It is made up of 55.9 plastic material；The optical filter 66 uses BK7-SCHOTT glass material systems
Into.
In the embodiment of the present invention four, optical shooting lens effective focal length is 2.651, back focal length 0.707；Thing side
R41 is have point of inflexion aspherical, and the first lens L1, the 3rd lens L3, the 4th lens L4 use same plastic cement material
Material advantageously reduces material, reduces cost, and can reach bigger image height well, and camera lens overall length is 3.658, that is, is met：
＜ (the ACT of 0.19 ＜ BFL/TTL ＜, 0.23,1.2 ＜ TTL/EFL ＜ 1.5,0.181+ACT2+ACT3The ＜ of)/EFL ＜ 0.45,1.0
EFL/f1The ＜ EFL/f of 1.14,0.4 ＜ R3/R4 ＜ of ＜ 1.1,0.263The ＜ GCT of ＜ 0.47,0.443/GET3＜ 0.74.
In the embodiment of the present invention four, the above-mentioned optical shooting lens that can prove the present invention can effectively correct aberration,
So that camera lens has shorter overall length and bigger image height, and then lift the application of the present invention.
Show in the embodiment of the present invention five, in following table nine and numbered by the optical surface of thing side to image side sequentially respectively
(SurfaceNumber), in the radius of curvature R i (units of the last optical surface of optical axis：mm)(The Radius of Curvature
R), the distance between each face d on optical axisi(unit：Mm) (The on-axis Surface Spacing), the refraction of each lens
Rate (Ndi), Abbe number (Abbe ' s Number) Vd of each lensi。
Table nine
In the embodiment of the present invention five, in table nine, optical surface (Surface) have mark * person for aspherics face,
R11, R12 represent the first lens L1 thing side and image side surface respectively；R21, R22 represent respectively the second lens L2 thing side and
Image side surface；R31, R32 represent the 3rd lens L3 thing side and image side surface respectively；R41, R42 represent the 4th lens L4's respectively
Thing side and image side surface, Fno are the focal distance ratio of optical lens, and EFL is the effective focal length of orientation camera lens, and 2w is optical orientation camera lens
The angle of visual field；Following table two shows aspherical each term coefficient of each optical surface；Following table ten shows each optical surface
Aspherical each term coefficient：
Table ten
| K | A4 | A6 | A8 | A10 | A12 | A14 | A16 | |
| *R11 | 2.345E+00 | -1.182E-01 | -7.712E-01 | 3.326E+00 | -1.256E+01 | 2.037E+01 | -1.694E+01 | 3.488E+00 |
| *R12 | -3.020E+00 | -2.992E-01 | -3.272E-01 | 4.842E-01 | -3.007E+00 | 8.502E+00 | -9.520E+00 | 2.363E+00 |
| *R21 | -9.702E+00 | -7.187E-01 | 2.992E-01 | 5.621E-01 | 4.542E+00 | -1.169E+01 | 1.131E+01 | -4.818E+00 |
| *R22 | -1.708E+00 | 2.690E-01 | -1.457E+00 | 1.597E+00 | 5.427E+00 | -1.436E+01 | 1.340E+01 | -4.773E+00 |
| *R31 | 1.812E+00 | 9.791E-01 | -2.958E+00 | 3.716E+00 | 2.835E-01 | -6.258E+00 | 7.006E+00 | -2.636E+00 |
| *R32 | 4.098E-01 | -2.639E-02 | 1.944E-01 | -2.539E-01 | 1.354E-01 | 5.308E-02 | -6.814E-03 | -1.802E-02 |
| *R41 | -2.450E+00 | -5.032E-01 | 3.201E-01 | -9.826E-02 | 5.730E-03 | 6.487E-03 | -1.597E-03 | 5.492E-06 |
| *R42 | -8.760E-01 | -7.415E-01 | 5.973E-01 | -3.890E-01 | 1.703E-01 | -4.737E-02 | 7.437E-03 | -5.001E-04 |
In the embodiment of the present invention five, the first lens L1 is by refractive index Nd1For 1.54, Abbe number Vd1For 55.9 modeling
Glue material is made；The second lens L2 is by refractive index Nd2For 1.64, Abbe number Vd2It is made up of 22.4 plastic material；It is described
3rd lens L3 is by refractive index Nd3For 1.54, Abbe number Vd3It is made up of 55.9 plastic material；The 4th lens L4 is by reflecting
Nd4For 1.54, Abbe number Vd4It is made up of 55.9 plastic material；The optical filter 66 uses BK7-SCHOTT glass material systems
Into.
In the embodiment of the present invention five, optical shooting lens effective focal length is 2.505, back focal length 0.710；Thing side
R41 is have point of inflexion aspherical, and the first lens L1, the 3rd lens L3, the 4th lens L4 use same plastic cement material
Material advantageously reduces material, reduces cost, and can reach bigger image height well, and camera lens overall length is 3.610, that is, is met：
＜ (the ACT of 0.19 ＜ BFL/TTL ＜, 0.23,1.2 ＜ TTL/EFL ＜ 1.5,0.181+ACT2+ACT3The ＜ of)/EFL ＜ 0.45,1.5
The ＜ EFL/f of TTL/y ＜ 1.6,1.01The ＜ EFL/f of 1.14,0.4 ＜ R3/R4 ＜ of ＜ 1.1,0.263The ＜ GCT of ＜ 0.47,0.443/
GET3The ＜ w/CRA ＜ 1.4 of ＜ 0.74,1.2.
In the embodiment of the present invention five, above-mentioned material can prove that the optical shooting lens of the present invention can effectively correct picture
Difference so that camera lens has shorter overall length and bigger image height, and then lifts the application of the present invention.
In spherical aberration curve map shown in Fig. 2,6,10,14,18, ordinate is longitudinal spherical aberration
(Longitudinal Spherical Aber), abscissa is focal length, and unit is millimeter.It can be seen that in different focal lengths
Under skew, the change situation of its spherical aberration.
Shown in Fig. 3,7,11,15,19 is abscissa table in the curvature of field (Astigmatic Field Curves) curve map
Show focal length, unit millimeter；Ordinate represents image height (Image) (including tangential and radial direction), as can be seen from the figure for difference
Focus offset under, with caused by the different image heights of optical axis the curvature of field change situation.
Shown in Fig. 4,8,12,16,20 is in image deformation (Distortion) curve map, and abscissa represents twisting coefficient
Percentage；Ordinate represents that as can be seen from the figure in different image heights, it is turned round with the different image heights (Image HT) of optical axis
The change situation of curvature.
The present invention is not limited to above-mentioned preferred forms, and anyone can show that other are each under the enlightenment of the present invention
The four-piece type optical shooting lens and its imaging method of the angle of visual field of being grown up with short mirror of kind form.It is all according to the present patent application patent
The equivalent changes and modifications that scope is done, it should all belong to the covering scope of the present invention.
Claims (7)
- A kind of 1. four-piece type optical shooting lens for the angle of visual field of being grown up with short mirror, it is characterised in that：Including along camera lens optical axis It is the aperture diaphragm sequentially arranged from the object side to image side, the first lens L1 with positive diopter, second with negative diopter saturating Mirror L2, the 3rd lens L3 with positive diopter, the 4th lens L4 with negative diopter, optical filter and IMAQ member Part, the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 are non-spherical lens, wherein described First lens L1 thing side is convex surface, the image side surface of the first lens L1 is concave surface, the thing side of the second lens L2 Image side surface for concave surface, the second lens L2 is convex surface, and bends towards image side surface at the second lens L2 image side surface large aperture, institute The thing side for stating the 3rd lens L3 is concave surface, the image side surface of the 3rd lens L3 is convex surface, the thing side of the 4th lens L4 Face and image side surface are in W fonts, on camera lens optical axis the thing side of the first lens L1 to image acquisition element imaging surface Distance TTL, the first lens L1 and the second lens L2 center air are at intervals of ACT1, the second lens L2 and the 3rd it is saturating Mirror L3 center air is at intervals of ACT2, the 3rd lens L3 and the 4th lens L4 center air at intervals of ACT3, described Three lens L3 center thickness GCT3, the 3rd lens L3 edge thickness G ET3, the 4th lens L4 image side surface to scheming As the imaging surface of acquisition elements it is nearest a little and the distance of the imaging surface of image acquisition element is that BFL and overall optics take As the focal length EFL of microscope group meets following relation：＜ (the ACT of 0.19 ＜ BFL/TTL ＜, 0.23,1.2 ＜ TTL/EFL ＜ 1.5,0.181 +ACT2+ACT3The ＜ GCT of)/EFL ＜ 0.45,0.443/GET3＜ 0.74.
- 2. the four-piece type optical shooting lens of the angle of visual field according to claim 1 of being grown up with short mirror, it is characterised in that：Institute State the first lens L1 focal length f1, the 3rd lens L3 focal length f3And the focal length EFL of overall optical image-taking microscope group meets Following relation：1.0 ＜ EFL/f1The ＜ EFL/f of ＜ 1.14,0.263＜ 0.47.
- 3. the four-piece type optical shooting lens of the angle of visual field according to claim 1 of being grown up with short mirror, it is characterised in that：Institute State the radius of curvature R 3 of the second lens L2 thing side, the radius of curvature R 4 of image side surface of the second lens L2 meets with ShiShimonoseki System：0.4 ＜ R3/R4 ＜ 1.1.
- 4. the four-piece type optical shooting lens of the angle of visual field according to claim 1 of being grown up with short mirror, it is characterised in that：Institute State the chief ray incidence angles CRA of image acquisition element, the cornerwise half y of the effective pixel area of described image acquisition elements, The distance TTL of imaging surface of the half w of overall angle of visual field and the first lens L1 the thing side to image acquisition element expires It is enough lower relation：The ＜ w/CRA ＜ 1.4 of 1.5 ＜ TTL/y ＜ 1.6,1.2.
- 5. the four-piece type optical shooting lens of the angle of visual field according to claim 1 of being grown up with short mirror, it is characterised in that：Institute State the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 and be satisfied by following relation：Z is aspherical rise in formula, and c is aspherical song Rate, K are quadratic surface circular cone coefficient, and r is aspherical radial coordinate, A4、A6、A8... be respectively aspherical four, six, Eight ... wait rank asphericity coefficient.
- 6. the four-piece type optical shooting lens of the angle of visual field according to claim 1 of being grown up with short mirror, it is characterised in that：Institute State the plastic cement material system that the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 are less than 1.65 by refractive index Into the optical filter is made up of Schott-BK7 materials.
- 7. it is a kind of with short mirror grow up the angle of visual field four-piece type optical shooting lens imaging method, including such as claim 1~6 The four-piece type optical shooting lens of the angle of visual field of being grown up with short mirror described in any one, it is characterised in that comprise the steps of：(1) light beam enters the first lens L1 by the aperture diaphragm, wherein having by light beam on the axle of the first lens L1 The trend of convergence, the light of big visual field have the bigger angle of emergence；(2) second lens L2 of the light beam Jing Guo the high index of refraction, wherein central light beam further converge, the second lens L2 Image side surface heavy caliber at contrary flexure the light of outermost visual field is gathered, can effectively control spherical aberration and the disperse of outermost visual field Spot；(3) after the 3rd lens L3 of the light beam by the regular low refraction, each visual-field beam is uniformly distributed, laser beam smoothing mistake Cross, light beam can preferably correcting chromatic aberration after the second lens L2, the 3rd lens L3；(4) light beam converges to image acquisition element after the 4th lens L4, and the 4th lens L4 not only ensures respectively to regard Chief ray incidence angles of the field on the imaging surface of image acquisition element are small as far as possible, and are effectively improved place and distortion aberration.
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| CN201903685U (en) * | 2010-11-19 | 2011-07-20 | 大立光电股份有限公司 | Optical lens group for image capture |
| CN202929277U (en) * | 2012-11-20 | 2013-05-08 | 浙江舜宇光学有限公司 | Miniature camera lens |
| CN203385928U (en) * | 2013-07-09 | 2014-01-08 | 先进光电科技股份有限公司 | Thin four-piece imaging lens group |
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