CN100589007C - Wide-angle lens - Google Patents
Wide-angle lens Download PDFInfo
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- CN100589007C CN100589007C CN200710085652A CN200710085652A CN100589007C CN 100589007 C CN100589007 C CN 100589007C CN 200710085652 A CN200710085652 A CN 200710085652A CN 200710085652 A CN200710085652 A CN 200710085652A CN 100589007 C CN100589007 C CN 100589007C
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- lens
- wide
- spherical
- spherical lens
- angle
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- 239000006185 dispersion Substances 0.000 claims description 6
- 230000005499 meniscus Effects 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000003384 imaging method Methods 0.000 description 9
- 230000004075 alteration Effects 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 7
- 239000011521 glass Substances 0.000 description 6
- 201000009310 astigmatism Diseases 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 239000006059 cover glass Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The invention relates to a wide angle lens, which comprises a first lens group and a second lens group arranged in sequence from an object side to an image side. The first lens group comprises a firstspherical lens, a second spherical lens and a third spherical lens arranged in sequence from the object side to the image side. The second lens group comprises a fourth spherical lens and a fifth spherical lens arranged in sequence from the object side to the image side. The refractions from the first spherical lens to the fifth spherical lens are negative, negative, positive, positive and positive in sequence. The wide angle lens meets the following two conditions: 1 < D/F G1 is less than 3 and D/F G2 is more than 4 and is less than 6, wherein, D is the distance from the surface of the fistspherical lens facing the object side to the image side; F G1is the effective focal length of the first lens group, and F G2 is the effective focal length of the second lens group. The wide angle lens has an advantage that, as the five lenses adopted by the wide angle lens are all spherical lenses, cost can be reduced.
Description
Technical field
The present invention relates to a kind of camera lens, and particularly relate to a kind of wide-angle lens (wide anglelens).
Background technology
Along with modern video signal development of technology, digital camera (digital video camera, DVC) and digital camera (digital camera DC) waits device for image to be used at large, and is widely used in each field.One of core parts in these device for image (image apparatus) are camera lens, its in order to image definition image in screen or charge coupled cell (Charge Coupled Device, CCD) on, and when device for image is applied in some specific area, its can adopt wide-angle lens with increase field angle (field of view, FOV).For instance, automobile-used reversing video camera just needs to adopt wide-angle lens.
Generally speaking, the visual angle of automobile-used wide-angle lens is more than 90 degree.And adopt the image that wide-angle lens captured to have serious TV distortion (TV distortion) usually on screen, and its numerical value is far away from usually 10%.Therefore, how to design the wide-angle lens that serious TV distortion extensively and not can be caused in the visual angle, become important problem.In known technology, can adopt non-spherical lens (aspheric lens) to reduce the TV distortion.
Referring to Fig. 1, U.S. patent of invention No.6,353,509 wide-angle lens that disclosed 100 comprise from a thing side (object side) to picture side (image side) three lens combination (lens group) 110,120 and 130 of arranging in regular turn, and that its diopter (refractive power) is respectively is negative, positive, just.Lens combination 110 is made up of a slice lens 112, and lens combination 120 is made up of a slice lens 122, and lens combination 130 is made up of 132,134,136,138 on lens.Wherein, lens 138 are non-spherical lens.Yet the production cost of non-spherical lens is higher, and the cost of the wide-angle lens 100 of feasible employing non-spherical lens is too high.
Summary of the invention
The purpose of this invention is to provide a kind of wide-angle lens, it has that cost is low, volume is little concurrently and advantage such as optical quality is good.
Other purpose of the present invention and advantage can be further understood from the disclosed technical characterictic of the present invention.
For reaching one of above-mentioned or partly or all purposes or other purpose, the present invention proposes a kind of wide-angle lens, comprises one first lens combination and one second lens combination of arranging in regular turn as side from a thing side to.First lens combination is by being formed from thing side to one first spherical lens (spherical lens), one second spherical lens and one the 3rd spherical lens arranged in regular turn as side.Second lens combination is by being formed from thing side to one the 4th spherical lens and one the 5th spherical lens arranged in regular turn as side.The diopter of first spherical lens to the, five spherical lenses is in regular turn for negative, negative, positive, just, just.This wide-angle lens satisfies following two conditions: (1) 1＜D/F
G1＜3; (2) 4＜D/F
G2＜6.Wherein, D is the surperficial distance to the picture side towards the thing side of first spherical lens; F
G1Be first lens combination effective focal length (effective focal length, EFL); And F
G2It is the effective focal length of second lens combination.
Based on above-mentioned, wide-angle lens of the present invention must not adopt the higher non-spherical lens of cost, so cost is lower, than the tool price competitiveness.In addition, wide-angle lens of the present invention adopt diopter in regular turn for negative, negative, positive, just, five positive spherical lenses lower aberration (aberration) and TV distortion, owing to number of lenses is less, so have the advantage of small size.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and in conjunction with the accompanying drawings, carry out following detailed description.
Description of drawings
Fig. 1 is the structural representation of known a kind of wide-angle lens;
Fig. 2 is the structural representation of the wide-angle lens of one embodiment of the invention;
Fig. 3 is the synoptic diagram that the TV of the wide-angle lens imaging of Fig. 2 distorts;
Fig. 4 is the image optics emulated data figure of the wide-angle lens of Fig. 2.
[main element symbol description]
10: photo-sensitive cell
100,200: wide-angle lens
110,120,130: lens combination
112,122,132,134,136,138: lens
210: the first lens combination
212: the first spherical lenses
214: the second spherical lenses
216: the three spherical lenses
220: the second lens combination
222: the four spherical lenses
224: the five spherical lenses
230: aperture diaphragm
240: the infrared light barrier flaps
250: glass cover
300: the image of rectangle object
S1～S12: surface
Embodiment
The explanation of following each embodiment is with reference to the accompanying drawings, can be in order to the specific embodiment of implementing in order to illustration the present invention.The direction term that the present invention mentioned, for example " on ", D score, " preceding ", " back ", " left side ", " right side " etc., only be direction with reference to the accompanying drawings.Therefore, the direction term of use is to be used for explanation, but not is used for limiting the present invention.
Fig. 2 is the structural representation of the wide-angle lens of one embodiment of the invention.With reference to Fig. 2, the wide-angle lens 200 of present embodiment is suitable for and will be positioned at Scenery Imaging to the picture side of a thing side, wherein as the configurable for example charge coupled cell of side (charge coupled device, CCD), CMOS (Complementary Metal-OxideSemiconductor, CMOS) or the photo-sensitive cell (light sensing device) 10 of egative film etc., with the image of acquisition imaging to the picture side.
Wide-angle lens 200 comprises from the thing side to one first lens combination 210 and one second lens combination 220 of arranging in regular turn as side.First lens combination 210 is by being formed from thing side to one first spherical lens 212, one second spherical lens 214 and one the 3rd spherical lens 216 arranged in regular turn as side.Second lens combination 220 is by being formed from thing side to one the 4th spherical lens 222 and one the 5th spherical lens 224 arranged in regular turn as side.The diopter of first spherical lens, 212 to the 5th spherical lenses 224 is in regular turn for negative, negative, positive, just, just.This wide-angle lens 200 satisfies following two conditions: (1) 1＜D/F
G1＜3; (2) 4＜D/F
G2＜6.Wherein, D be first spherical lens 212 towards the surperficial S1 of thing side distance to the picture side; F
G1It is the effective focal length of first lens combination 210; And F
G2It is the effective focal length of second lens combination 220.
Hold above-mentionedly, the lens that the wide-angle lens 200 of present embodiment is adopted are all spherical lens.Owing to must not adopt expensive non-spherical lens, so the cost of the wide-angle lens 200 of present embodiment is lower and than the tool price competitiveness.In addition, because the number of lenses of wide-angle lens 200 only is five, so overall volume can be less, to meet the trend of miniaturization of electronic products.Moreover the design that the diopter of first spherical lens, 212 to the 3rd spherical lenses 216 is respectively negative, negative, positive can effectively reduce the degree of aberration and TV distortion, to promote the optical characteristics of wide-angle lens 200.
In order to make wide-angle lens 200 have better optical characteristics, its parameters can be designed to meet following all or part of condition.These conditions are:
(1)1＜F
L3/F
0＜4；
(2)-8＜F
L1/F
0＜-6；
(3)3＜F
G1/F
0＜5；
(4)4＜F
G2/F
0＜6；
(5)N
d1＞1.7；
(6)V
d2＞45；
(7)N
d3＞1.7；
(8)V
d3＜35；
(9)N
d4＞1.7。
Wherein, F
0Effective focal length for wide-angle lens 200; F
L3It is the effective focal length of the 3rd spherical lens 216; F
L1It is the effective focal length of first spherical lens 212; N
D1It is the refractive index of first spherical lens 212; V
D2It is the dispersion values of second spherical lens 214; N
D3It is the refractive index of the 3rd spherical lens 216; V
D3It is the dispersion values of the 3rd spherical lens 216; And N
D4It is the refractive index of the 4th spherical lens 222.
In order to make wide-angle lens 200 have better optical characteristics, the material of first spherical lens, 212 to the 5th spherical lenses 224 can be glass.In addition, wide-angle lens 200 can further comprise an aperture diaphragm 230, an infrared light barrier flaps (IR-cut filter) 240 or one glass cover (cover glass) 250.Wherein, aperture diaphragm 230 is disposed at (for example: between surperficial S6 and the surperficial S8) between the 3rd spherical lens 216 and the 4th spherical lens 222, the 3rd spherical lens 216 near on the surperficial S6 that look like sides or on the 4th spherical lens 222 close surperficial S8 of thing side, with the control incident light quantity, and this embodiment is disposed at aperture diaphragm 230 between the 3rd spherical lens 216 and the 4th spherical lens 222; And infrared light barrier flaps 240 and glass cover 250 are disposed between the 5th spherical lens 224 and the picture side in regular turn, and wherein glass cover 250 is in order to the photo-sensitive cell 10 of protection as side.
In the present embodiment, first spherical lens 212 and second spherical lens 214 can be the meniscus of convex surface towards the thing side, the 3rd spherical lens 216 and the 5th spherical lens 224 can be all biconvex lens, and the 4th spherical lens 222 can be the concave-convex lens of convex surface towards the picture side.
Following content will be enumerated the preferred parameter value in the wide-angle lens 200, yet, hereinafter cited data information is not in order to limit the present invention, any those skilled in the art is after reference the present invention, when doing suitable change, precisely because must belong in the category of the present invention to its parameter or setting.
Table one
In Table 1, radius-of-curvature (mm) refers to the radius-of-curvature that each is surperficial, and spacing (mm) is meant the distance between two adjacent surfaces.For instance, the spacing of surperficial S1, promptly surperficial S1 is to the distance between surperficial S2, and the pairing thickness of each lens, refractive index and dispersion values please refer to each spacing in the same column, refractive index and dispersion values value corresponding in the remarks column.S1, S2 are two surfaces of first lens 212 on the surface.S3, S4 are two surfaces of second lens 214 on the surface.S5, S6 are two surfaces of the 3rd lens 216 on the surface.Surface S7 is the surface of aperture diaphragm 230.S8, S9 are two surfaces of the 4th lens 222 on the surface.S10, S11 are two surfaces of the 5th lens 224 on the surface.Surface S12 is an active surface of photo-sensitive cell.Relevant for each surperficial radius-of-curvature, spacing or the like parameter value,, no longer repeat at this with reference to table one.
Table two
| Effective focal length (EFL) (mm) | 1.63 |
| Field angle (FOV) (deg.) | 133 |
| F numerical value (f-number) | 2.8 |
In table two, list some important parameter values of wide-angle lens 200 respectively, comprise effective focal length, field angle, f numerical value (f-number).Field angle that it should be noted that the wide-angle lens 200 of present embodiment can be up to 133 degree.
Fig. 3 is the synoptic diagram that the TV of the wide-angle lens imaging of Fig. 2 distorts.With reference to Fig. 3, after wide-angle lens 200 imagings, the absolute value of the TV of the image 300 on screen distortion, promptly | Δ h/H| only is about 9.7%, wherein Δ h is that actual Y direction center imaging mid-height deducts the poor of Y direction edge imaging mid-height, and H is the value of Y direction center imaging overall height.Surpass 10% compared to the TV distortion of the wide-angle lens imaging of known technology is far away, the wide-angle lens 200 of present embodiment can effectively reduce the TV distortion.
Fig. 4 is the image optics emulated data figure of the wide-angle lens of Fig. 2.In Fig. 4, be the figure of longitudinal spherical aberration (Longitudinal Spherical Aberration), the astigmatism curvature of field (Astigmatism Field Curves) and distortion (Distortion) in regular turn from the right side by a left side.Because all in the scope of standard, therefore wide-angle lens 200 of the present invention has the good optical quality to the figure of longitudinal spherical aberration, the astigmatism curvature of field and the distortion of wide-angle lens 200 of the present invention.
In sum, the lens that wide-angle lens of the present invention adopted are all spherical lens, owing to must not adopt expensive non-spherical lens, so cost is lower and than the tool price competitiveness.In addition, because the number of lenses of wide-angle lens only is five, so overall volume can be less, to meet the trend of miniaturization of electronic products.In addition, the diopter of first spherical lens to the, three spherical lenses is respectively the degree of negative, negative, positive volume design can effectively minimizing aberration and TV distortion, to promote the optical characteristics of wide-angle lens of the present invention.In addition, the material of first spherical lens to the, five spherical lenses can be glass, so that wide-angle lens of the present invention has better optical characteristics.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when doing a little change and modification; therefore protection scope of the present invention is when looking being as the criterion that accompanying Claim defines, and arbitrary embodiment of the present invention in addition or claim must not realize the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary part and title only are with helping the usefulness that patent document is searched, and are not to be used for limiting interest field of the present invention.
Claims (12)
1, a kind of wide-angle lens comprises:
One first lens combination, it is made up of one first spherical lens of arranging in regular turn as side from a thing side to, one second spherical lens and one the 3rd spherical lens, and this first spherical lens to the diopter of the 3rd spherical lens in regular turn for negative, negative, positive; And
One second lens combination, it is between this first lens combination and this are as side, and be made up of this thing side to this one the 4th spherical lens and one the 5th spherical lens of arranging in regular turn as side certainly, and the diopter of the 4th spherical lens and the 5th spherical lens is in regular turn for just, just
1＜D/F wherein
G1＜3, and 4＜D/F
G2＜6, D be this first spherical lens towards a surface of this thing side to this distance, F as side
G1Be the effective focal length of this first lens combination, F
G2Effective focal length for this second lens combination.
2, wide-angle lens as claimed in claim 1, wherein the effective focal length of this wide-angle lens is F
0, and the effective focal length of the 3rd spherical lens is F
L3, and 1＜F
L3/ F
0＜4.
3, wide-angle lens as claimed in claim 1, wherein the effective focal length of this wide-angle lens is F
0, and the effective focal length of this first spherical lens is F
L1, and-8＜F
L1/ F
0＜-6.
4, wide-angle lens as claimed in claim 1, wherein the effective focal length of this wide-angle lens is F
0, and 3＜F
G1/ F
0＜5.
5, wide-angle lens as claimed in claim 1, wherein the effective focal length of this wide-angle lens is F
0, and 4＜F
G2/ F
0＜6.
6, wide-angle lens as claimed in claim 1, wherein the refractive index of this first spherical lens is greater than 1.7.
7, wide-angle lens as claimed in claim 1, wherein the dispersion values of this second spherical lens is greater than 45.
8, wide-angle lens as claimed in claim 1, wherein the refractive index of the 3rd spherical lens is greater than 1.7.
9, wide-angle lens as claimed in claim 1, wherein the dispersion values of the 3rd spherical lens is less than 35.
10, wide-angle lens as claimed in claim 1, wherein the refractive index of the 4th spherical lens is greater than 1.7.
11, wide-angle lens as claimed in claim 1, also comprise an aperture diaphragm, be disposed between the 3rd spherical lens and the 4th spherical lens, the 3rd spherical lens is gone up near this surface as side or the 4th spherical lens near on the surface of this thing side.
12, wide-angle lens as claimed in claim 1, wherein this first spherical lens and this second spherical lens are all the meniscus of convex surface towards this thing side, the 3rd spherical lens and the 5th spherical lens are all biconvex lens, and the 4th spherical lens is that convex surface is towards this concave-convex lens as side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710085652A CN100589007C (en) | 2007-03-06 | 2007-03-06 | Wide-angle lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710085652A CN100589007C (en) | 2007-03-06 | 2007-03-06 | Wide-angle lens |
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| Publication Number | Publication Date |
|---|---|
| CN101261354A CN101261354A (en) | 2008-09-10 |
| CN100589007C true CN100589007C (en) | 2010-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710085652A Active CN100589007C (en) | 2007-03-06 | 2007-03-06 | Wide-angle lens |
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| CN (1) | CN100589007C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053342B (en) * | 2009-10-29 | 2013-05-29 | 比亚迪股份有限公司 | Ultra-wide-angle lens |
| CN102455486B (en) * | 2010-10-20 | 2014-04-30 | 鸿富锦精密工业（深圳）有限公司 | Ultra wide-angle lens |
| CN103558677B (en) * | 2013-11-11 | 2015-11-18 | 舜宇光学(中山)有限公司 | A kind of without thermalization monitoring camera |
| JP5905634B1 (en) * | 2015-10-29 | 2016-04-20 | エーエーシーアコースティックテクノロジーズ（シンセン）カンパニーリミテッドＡＡＣ Ａｃｏｕｓｔｉｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ（Ｓｈｅｎｚｈｅｎ）Ｃｏ．，Ｌｔｄ | Imaging lens |
| EP3611547B1 (en) * | 2017-04-14 | 2022-12-28 | Panasonic Intellectual Property Management Co., Ltd. | Single-focal lens system, imaging device having single-focal lens system, and moving body having imaging device |
| CN111601100B (en) * | 2020-03-27 | 2022-07-29 | 惠州市德赛西威汽车电子股份有限公司 | TV distortion calculation method |
| CN113376800B (en) * | 2021-06-04 | 2022-09-23 | 江西凤凰光学科技有限公司 | Wide-working-distance large-aperture wide-angle TOF lens |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4907866A (en) * | 1985-04-05 | 1990-03-13 | Canon Kabushiki Kaisha | Objective of variable focal length |
-
2007
- 2007-03-06 CN CN200710085652A patent/CN100589007C/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4907866A (en) * | 1985-04-05 | 1990-03-13 | Canon Kabushiki Kaisha | Objective of variable focal length |
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| CN101261354A (en) | 2008-09-10 |
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