CN107942481A - 265 ° of ultra-wide angle fish eye lenses - Google Patents

265 ° of ultra-wide angle fish eye lenses Download PDF

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Publication number
CN107942481A
CN107942481A CN201711193908.9A CN201711193908A CN107942481A CN 107942481 A CN107942481 A CN 107942481A CN 201711193908 A CN201711193908 A CN 201711193908A CN 107942481 A CN107942481 A CN 107942481A
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CN
China
Prior art keywords
lens
ultra
plane
wide angle
abbe
Prior art date
Application number
CN201711193908.9A
Other languages
Chinese (zh)
Inventor
曹玉坚
李沙
江威
况强华
安峰博
裴锐锐
曾春燕
Original Assignee
中山依瓦塔光学有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 中山依瓦塔光学有限公司 filed Critical 中山依瓦塔光学有限公司
Priority to CN201711193908.9A priority Critical patent/CN107942481A/en
Publication of CN107942481A publication Critical patent/CN107942481A/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/06Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

Abstract

This application involves camera lens, more particularly to 265 ° of ultra-wide angle fish eye lenses.It includes lens barrel, and be equipped with the lens barrel includes successively along optical axis from object plane to image planes:First lens, second lens, 3rd lens, 4th lens, 5th lens, 6th lens, 7th lens, 8th lens, 9th lens, tenth lens, 11st lens, in the lens barrel ccd sensor chip is additionally provided with rear side of the 11st lens, optical filter and the protective glass eyeglass between the optical filter and the ccd sensor are additionally provided between 11st lens and the ccd sensor chip, so that the field angle of camera lens reaches 265 ° of ultra-wide angle scope, but F Theta distortion can but be less than 11%, the picture edge deformation amount so taken is relatively small, correct aberration well, and there is good image quality, the effect of ten million pixel can be reached, improve image quality.

Description

265 ° of ultra-wide angle fish eye lenses

【Technical field】

This application involves camera lens, more particularly to 265 ° of ultra-wide angle fish eye lenses.

【Background technology】

With the development of optical lens and chip technology, conventional wide-angle lens is due to the limit of its field range observed System, cannot meet the application of some occasions, such as security protection, monitoring lamp field, conventional camera lens is due to its angle of view Limitation, just have monitoring dead angle, and the requirement of super large range of observation can be satisfied in fish eye lens, can solve the problems, such as this. As fish eye lens of the general field angle more than 140 °, is 265 ° of ultra-wide angle fish eye lenses more than 180 °, at present on the market most 265 ° of big ultra-wide angle fish eye lenses can reach 220 ° or 230 °.

【The content of the invention】

To provide a kind of fish eye lens with bigger visual field, this application provides 265 ° of ultra-wide angle that field angle is 265 ° Fish eye lens.

The application is achieved through the following technical solutions:

265 ° of ultra-wide angle fish eye lenses, it includes lens barrel, is equipped with the lens barrel and is wrapped successively from object plane to image planes along optical axis Include:First lens, the second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens, the 8th lens, Nine lens, the tenth lens, the 11st lens, the lens barrel is interior to be additionally provided with ccd sensor core on rear side of the 11st lens Piece, be additionally provided between the 11st lens and the ccd sensor chip optical filter and positioned at the optical filter with it is described Protective glass eyeglass between ccd sensor;

The first lens object plane side is convex surface, and image planes side is convex surface;

The second lens object plane side is convex surface, and image planes side is convex surface;

The 3rd lens object plane side is convex surface, and image planes side is convex surface;

The 4th lens object plane side is concave surface, and image planes side is convex surface;

The 5th lens object plane side is concave surface, and image planes side is convex surface;

The 6th lens object plane side is convex surface, and image planes side is concave surface;

The 7th lens object plane side is convex surface, and image planes side is concave surface;

The 8th lens object plane side is concave surface, and image planes side is concave surface;

The 9th lens object plane side is concave surface, and image planes side is convex surface;

The tenth lens object plane side is convex surface, and image planes side is concave surface;

The 11st lens object plane side is convex surface, and image planes side is plane.

265 ° of ultra-wide angle fish eye lenses as described above, also meet following condition:

(1)1.80<Nd1<1.95;30<Vd1<50;

(2)1.50<Nd2<1.95;20<Vd2<35;

(3)1.55<Nd3<1.65;25<Vd3<40;

(4)1.60<Nd4<1.75;45<Vd4<60;

(5)1.50<Nd5<1.65;50<Vd5<70;

(6)1.85<Nd6<1.95;50<Vd6<70;

(7)1.45<Nd7<1.65;50<Vd7<70;

(8)1.80<Nd8<1.92;20<Vd8<35;

(9)1.80<Nd9<1.95;20<Vd9<35;

(10)1.67<Nd10<1.90;40<Vd10<60;

(11)1.60<Nd11<1.75;40<Vd11<60.

Wherein, Nd1 is the refractive index of the first lens, and Vd1 is the abbe number of the first lens;Nd2 is the folding of the second lens Rate is penetrated, Vd2 is the abbe number of the second lens;Nd3 is the refractive index of the 3rd lens, and Vd3 is the abbe number of the 3rd lens; Nd4 is the refractive index of the 4th lens, and Vd4 is the abbe number of the 4th lens;Nd5 is the refractive index of the 5th lens, and Vd5 is the 5th The abbe number of lens;Nd6 is the refractive index of the 6th lens, and Vd6 is the abbe number of the 6th lens;Nd7 is the 7th lens Refractive index, Vd7 are the abbe number of the 7th lens;Nd8 is the refractive index of the 8th lens, and Vd8 is the abbe number of the 8th lens; Nd9 is the refractive index of the 9th lens, and Vd9 is the abbe number of the 9th lens;Nd10 is the refractive index of the tenth lens, Vd10 the The abbe number of ten lens;Nd11 is the refractive index of the 11st lens, and Vd11 is the abbe number of the 11st lens.

265 ° of ultra-wide angle fish eye lenses as described above, first power of lens be it is negative, its focal length f1 for- 20mm。

265 ° of ultra-wide angle fish eye lenses as described above, second power of lens be it is negative, its focal length f2 for- 11mm。

265 ° of ultra-wide angle fish eye lenses as described above, the 3rd power of lens is just, its focal length f3 is 36mm.

265 ° of ultra-wide angle fish eye lenses as described above, the 4th power of lens be it is negative, its focal length f4 for- 3.8mm。

265 ° of ultra-wide angle fish eye lenses as described above, the 5th power of lens be it is negative, its focal length f5 for- 7.2mm。

265 ° of ultra-wide angle fish eye lenses as described above, the 6th power of lens is just, its focal length f6 is 5.2mm。

265 ° of ultra-wide angle fish eye lenses as described above, the 7th power of lens is just, its focal length f7 is 3.1mm。

265 ° of ultra-wide angle fish eye lenses as described above, the 8th power of lens be it is negative, its focal length f8 for- 12mm。

Compared with prior art, the application has the following advantages:

1st, it is rational by the way that the first lens to the 11st lens are carried out this application provides 265 ° of ultra-wide angle fish eye lenses Collocation, the characteristics of using each eyeglass self structure so that the field angle of camera lens reaches 265 ° of ultra-wide angle scope, but F- Theta distortion can but be less than 11%, and the picture edge deformation amount so taken is relatively small, and picture is closer to reality.Well Aberration is corrected, and has good image quality, the effect of ten million pixel can be reached, improve image quality.

【Brief description of the drawings】

In order to illustrate more clearly of the technical solution in the embodiment of the present application, make required in being described below to embodiment Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present application, for For those of ordinary skill in the art, without creative efforts, other can also be obtained according to these attached drawings Attached drawing.

Fig. 1 is 265 ° of fish-eye structure diagrams of ultra-wide angle of the application;

Fig. 2 is 265 ° of fish-eye imaging schematic diagrams of ultra-wide angle of the application;

Fig. 3 is the partial enlarged view of Fig. 2;

Fig. 4 is the fish-eye MTF transfer curves figure of 265 ° of ultra-wide angle of the application;

Fig. 5 is the fish-eye color difference control figure of 265 ° of ultra-wide angle of the application;

Fig. 6 is the fish-eye spot diameter figure of 265 ° of ultra-wide angle of the application.

【Embodiment】

In order to which the technical problem, technical solution and the beneficial effect that are solved the application are more clearly understood, below in conjunction with Accompanying drawings and embodiments, are further elaborated the application.It should be appreciated that specific embodiment described herein is only used To explain the application, it is not used to limit the application.

The application is achieved through the following technical solutions:

As shown in Figures 1 to 6,265 ° of ultra-wide angle fish eye lenses, it includes lens barrel, it is characterised in that is set in the lens barrel Have along optical axis includes successively from object plane to image planes:First lens 1, the second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5th, the 6th lens 6, the 7th lens 7, the 8th lens 8, the 9th lens 9, the tenth lens 10, the 11st lens 11, in the lens barrel Ccd sensor chip, the 11st lens 11 and the ccd sensor core are additionally provided with positioned at the rear side of the 11st lens 11 Optical filter 13 and the protective glass eyeglass 14 between the optical filter 13 and the ccd sensor are additionally provided between piece; First lens, the 1 object plane side is convex surface, and image planes side is convex surface;Second lens, the 2 object plane side is convex surface, and image planes side is convex Face;3rd lens, the 3 object plane side is convex surface, and image planes side is convex surface;4th lens, the 4 object plane side is concave surface, and image planes side is Convex surface;5th lens, the 5 object plane side is concave surface, and image planes side is convex surface;6th lens, the 6 object plane side is convex surface, image planes side For concave surface;7th lens, the 7 object plane side is convex surface, and image planes side is concave surface;8th lens, the 8 object plane side is concave surface, image planes Side is concave surface;9th lens, the 9 object plane side is concave surface, and image planes side is convex surface;Tenth lens, the 10 object plane side is convex surface, as Surface side is concave surface;11st lens, the 11 object plane side is convex surface, and image planes side is plane.By by the first lens 1 to the 11st Lens 11 are reasonably arranged in pairs or groups, the characteristics of using each eyeglass self structure so that the field angle of camera lens reaches 265 ° super Wide angular range, but F-Theta distortion can but be less than 11%, the picture edge deformation amount so taken is relatively small, and picture is more Closing to reality.Aberration is corrected well, and has good image quality, the effect of ten million pixel can be reached, improved Image quality.

Further, 265 ° of ultra-wide angle fish eye lenses also meet following condition:(1)1.80<Nd1<1.95;30< Vd1<50;(2)1.50<Nd2<1.95;20<Vd2<35;(3)1.55<Nd3<1.65;25<Vd3<40;(4)1.60<Nd4< 1.75;45<Vd4<60;(5)1.50<Nd5<1.65;50<Vd5<70;(6)1.85<Nd6<1.95;50<Vd6<70;(7)1.45< Nd7<1.65;50<Vd7<70;(8)1.80<Nd8<1.92;20<Vd8<35;(9)1.80<Nd9<1.95;20<Vd9<35;(10) 1.67<Nd10<1.90;40<Vd10<60;(11)1.60<Nd11<1.75;40<Vd11<60.

Wherein, Nd1 is the refractive index of the first lens 1, and Vd1 is the abbe number of the first lens 1;Nd2 is the second lens 2 Refractive index, Vd2 are the abbe number of the second lens 2;Nd3 is the refractive index of the 3rd lens 3, and Vd3 is the dispersion system of the 3rd lens 3 Number;Nd4 is the refractive index of the 4th lens 4, and Vd4 is the abbe number of the 4th lens 4;Nd5 be the 5th lens 5 refractive index, Vd5 For the abbe number of the 5th lens 5;Nd6 is the refractive index of the 6th lens 6, and Vd6 is the abbe number of the 6th lens 6;Nd7 is The refractive index of seven lens 7, Vd7 are the abbe number of the 7th lens 7;Nd8 is the refractive index of the 8th lens 8, and Vd8 is the 8th lens 8 abbe number;Nd9 is the refractive index of the 9th lens 9, and Vd9 is the abbe number of the 9th lens 9;Nd10 is the tenth lens 10 Refractive index, Vd10 be the tenth lens 10 abbe number;Nd11 is the refractive index of the 11st lens 11, and Vd11 is saturating for the 11st The abbe number of mirror 11.The eyeglass abbe number of different refraction materials is also different, and refractive index is higher, and abbe number is lower, profit With the difference of each eyeglass attribute carry out it is reasonably combined after, the dispersion range after light to image planes is smaller so that fish-eye Imaging becomes apparent from, quality higher.

Further, 1 focal power of the first lens is negative, its focal length -21mm<f1<- 18mm, its preferred focal length f1 For -20mm.The refractive index Nd1 preferably 1.90 of first lens 1, abbe number Vd1 preferably 40, be conducive to make optical system or Camera lens forms sharp image.

Yet further, 2 focal power of the second lens is negative, its focal length -12mm<f2<- 10mm, its preferred focal length f1 For -11mm.The refractive index Nd2 preferably 1.90 of second lens 2, abbe number Vd2 preferably 23, be conducive to make optical system or Camera lens forms sharp image.

Also further, 3 focal power of the 3rd lens is just its focal length 35mm<f3<40mm, its preferred focal length f3 are 36mm.The refractive index Nd3 preferably 1.60 of 3rd lens 3, abbe number Vd3 preferably 30, is conducive to make optical system or mirror Capitiform is into sharp image.

Specifically, 4 focal power of the 4th lens is negative its focal length -5mm<f4<- 3mm, its preferred focal length f4 for- 3.8mm.The refractive index Nd4 preferably 1.70 of 4th lens 4, abbe number Vd4 preferably 50, is conducive to make optical system or mirror Capitiform is into sharp image.

More specifically, 5 focal power of the 5th lens is negative, its focal length -8mm<f5<- 5mm, its preferred focal length f5 for- 7.2mm.The refractive index Nd5 preferably 1.60 of 5th lens 5, abbe number Vd4 preferably 65, is conducive to make optical system or mirror Capitiform is into sharp image.

Again specifically, 6 focal power of the 6th lens is just its focal length 25mm<f6<33mm, its preferred focal length f6 are 30mm.The refractive index Nd6 preferably 1.88 of 6th lens 6, abbe number Vd6 preferably 30, is conducive to make optical system or mirror Capitiform is into sharp image.

Wherein, the 5th lens 5 and the 6th lens 6 are compound lens, its focal length f56 is 9mm.Be conducive to make optical system or Camera lens forms sharp image.

Further, 7 focal power of the 7th lens is just its focal length 2mm<f7<4mm, its preferred focal length f7 are 3.1mm.The refractive index Nd7 preferably 1.53 of 7th lens 7, abbe number Vd7 preferably 63, is conducive to make optical system or mirror Capitiform is into sharp image.

Further, 8 focal power of the 8th lens is negative its focal length -15mm<f8<- 10mm, its preferred focal length f8 For -12mm.The refractive index Nd8 preferably 1.83 of 8th lens 8, abbe number Vd8 preferably 30, be conducive to make optical system or Camera lens forms sharp image.

Wherein, the 7th lens and the 8th lens 8 are compound lens, its focal length f78 is 8mm.Be conducive to make optical system or Camera lens forms sharp image.

Specifically, 9 focal power of the 9th lens is negative its focal length -5mm<f9<- 2mm, its preferred focal length f9 is -3mm. The refractive index Nd9 preferably 1.90 of 9th lens 9, abbe number Vd9 preferably 23, is conducive to form optical system or camera lens Sharp image.

Again specifically, 10 focal power of the tenth lens is just its focal length 6mm<f10<8mm, its preferred focal length f10 are 6.5mm.The refractive index Nd10 preferably 1.78 of tenth lens 10, abbe number Vd10 preferably 55, is conducive to make optical system Or camera lens forms sharp image.

Again specifically, 11 focal power of the 11st lens is just its focal length 6mm<f11<9mm, its preferred focal length f11 are 7.6mm.The refractive index Nd11 preferably 1.63 of 9th lens 9, abbe number Vd11 preferably 51, be conducive to make optical system or Camera lens forms sharp image.

Specifically, optical filter 13 and protective glass 14 are additionally provided with after the 11st lens 11, are conducive to make optical system System or camera lens form sharp image.

Further, in the present embodiment, every basic parameter of this optical lens is as shown in the table:

In upper table, along optical axis 12 from object plane to image planes, S1, S2 correspond to two surfaces of the first lens 1;S3, S4 are corresponded to For two surfaces of the second lens 2;S5, S6 correspond to two surfaces of the 3rd lens 3;S7, S8 correspond to the two of the 4th lens 4 A surface;S9, S10 correspond to two surfaces of the 5th lens 5;STO is diaphragm position;It is saturating that S11, S12 correspond to the 6th Two surfaces of mirror 6;S13, S14 correspond to two surfaces of the 7th lens 7;S15, S16 correspond to two tables of the 8th lens 8 Face;S17, S18 correspond to two surfaces of the 9th lens 9;S19, S20 correspond to two surfaces of the tenth lens 10;S21、S22 Correspond to two surfaces of the 11st lens 11.

As can be seen that this optical system has good optical property from Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, light passes through After the convergence of this optical system, the areas imaging very little on the CCD of image planes, each wave band is converged on single pixel point finally In face and dull thread converges to rest of pixels point.

This application provides 265 ° of ultra-wide angle fish eye lenses, by the way that 1 to the 11st lens 11 of the first lens are carried out rationally Collocation, the characteristics of using each eyeglass self structure so that the field angle of camera lens reaches 265 ° of ultra-wide angle scope, and focal length is small In 1mm, with small target surface chip, but F-Theta distortion can but be less than 11%, and the picture edge deformation amount so taken is opposite Smaller, picture is closer to reality.Aberration is corrected well, and has good image quality, ten million pixel can be reached Effect, improves image quality.The application, which also can be applicable on panorama moving camera, can shoot excess of export clearly picture and super Big visual range, improves the experience sense of user.

It is to combine one or more embodiments that particular content provides as described above, does not assert the specific reality of the application Apply and be confined to these explanations.It is all approximate with the present processes, structure etc., identical, or under the application concept thereof Make some technologies to deduce, or replace the protection domain that should be all considered as the application.

Claims (10)

1.265 ° of ultra-wide angle fish eye lenses, it includes lens barrel, it is characterised in that in the lens barrel along optical axis from object plane to image planes according to It is secondary including:First lens (1), the second lens (2), the 3rd lens (3), the 4th lens (4), the 5th lens (5), the 6th lens (6), the 7th lens (7), the 8th lens (8), the 9th lens (9), the tenth lens (10), the 11st lens (11), the lens barrel Interior that ccd sensor chip is additionally provided with rear side of the 11st lens (11), the 11st lens (11) pass with the CCD Optical filter (13) and the protection glass between the optical filter (13) and the ccd sensor are additionally provided between sensor chip Glass eyeglass (14);
First lens (1) the object plane side is convex surface, and image planes side is convex surface;
Second lens (2) the object plane side is convex surface, and image planes side is convex surface;
3rd lens (3) the object plane side is convex surface, and image planes side is convex surface;
4th lens (4) the object plane side is concave surface, and image planes side is convex surface;
5th lens (5) the object plane side is concave surface, and image planes side is convex surface;
6th lens (6) the object plane side is convex surface, and image planes side is concave surface;
7th lens (7) the object plane side is convex surface, and image planes side is concave surface;
8th lens (8) the object plane side is concave surface, and image planes side is concave surface;
9th lens (9) the object plane side is concave surface, and image planes side is convex surface;
Tenth lens (10) the object plane side is convex surface, and image planes side is concave surface;
11st lens (11) the object plane side is convex surface, and image planes side is plane.
2. 265 ° of ultra-wide angle fish eye lenses according to claim 1, it is characterised in that also meet following condition:
(1)1.80<Nd1<1.95;30<Vd1<50;
(2)1.50<Nd2<1.95;20<Vd2<35;
(3)1.55<Nd3<1.65;25<Vd3<40;
(4)1.60<Nd4<1.75;45<Vd4<60;
(5)1.50<Nd5<1.65;50<Vd5<70;
(6)1.85<Nd6<1.95;50<Vd6<70;
(7)1.45<Nd7<1.65;50<Vd7<70;
(8)1.80<Nd8<1.92;20<Vd8<35;
(9)1.80<Nd9<1.95;20<Vd9<35;
(10)1.67<Nd10<1.90;40<Vd10<60;
(11)1.60<Nd11<1.75;40<Vd11<60.
Wherein, Nd1 is the refractive index of the first lens (1), and Vd1 is the abbe number of the first lens (1) (2);Nd2 is the second lens (2) refractive index, Vd2 are the abbe number of the second lens (2);Nd3 is the refractive index of the 3rd lens (3), and Vd3 is the 3rd lens (3) abbe number;Nd4 is the refractive index of the 4th lens (4), and Vd4 is the abbe number of the 4th lens (4);Nd5 is saturating for the 5th The refractive index of mirror (5), Vd5 are the abbe number of the 5th lens (5);Nd6 is the refractive index of the 6th lens (6), and Vd6 is saturating for the 6th The abbe number of mirror (6);Nd7 is the refractive index of the 7th lens (7), and Vd7 is the abbe number of the 7th lens (7);Nd8 is the 8th The refractive index of lens (8), Vd8 are the abbe number of the 8th lens (8);Nd9 is the refractive index of the 9th lens (9), and Vd9 is the 9th The abbe number of lens (9);Nd10 is the refractive index of the tenth lens (10), and Vd10 is the abbe number of the tenth lens (10); Nd11 is the refractive index of the 11st lens (11), and Vd11 is the abbe number of the 11st lens (11).
3. 265 ° of ultra-wide angle fish eye lenses according to claim 1 or 2, it is characterised in that the light of first lens (1) Focal power is negative, its focal length f1 is -20mm.
4. 265 ° of ultra-wide angle fish eye lenses according to claim 1 or 2, it is characterised in that the light of second lens (2) Focal power is negative, its focal length f2 is -11mm.
5. 265 ° of ultra-wide angle fish eye lenses according to claim 1 or 2, it is characterised in that the light of the 3rd lens (3) Focal power is just, its focal length f3 is 36mm.
6. 265 ° of ultra-wide angle fish eye lenses according to claim 1 or 2, it is characterised in that the light of the 4th lens (4) Focal power is negative, its focal length f4 is -3.8mm.
7. 265 ° of ultra-wide angle fish eye lenses according to claim 1 or 2, it is characterised in that the light of the 5th lens (5) Focal power is negative, its focal length f5 is -7.2mm.
8. 265 ° of ultra-wide angle fish eye lenses according to claim 1 or 2, it is characterised in that the light of the 6th lens (6) Focal power is just, its focal length f6 is 5.2mm.
9. 265 ° of ultra-wide angle fish eye lenses according to claim 1 or 2, it is characterised in that the light of the 7th lens (7) Focal power is just, its focal length f7 is 3.1mm.
10. 265 ° of ultra-wide angle fish eye lenses according to claim 1 or 2, it is characterised in that the 8th lens (8) Focal power is negative, its focal length f8 is -12mm.
CN201711193908.9A 2017-11-24 2017-11-24 265 ° of ultra-wide angle fish eye lenses CN107942481A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2507368A1 (en) * 1974-02-28 1975-09-04 Asahi Optical Co Ltd WIDE ANGLE LENS
US4061421A (en) * 1975-06-30 1977-12-06 Olympus Optical Co., Ltd. Retrofocus type lens system having ultra-wide angle of view
US4740063A (en) * 1983-09-14 1988-04-26 Asahi Kogaku Kogyo Kabushiki Kaisha Telephoto zoom lens system
CN101876744A (en) * 2009-04-29 2010-11-03 鸿富锦精密工业(深圳)有限公司 Projection lens
CN105445910A (en) * 2015-09-17 2016-03-30 上海大学 Super-large-field-of-view fish-eye lens having aspheric-structure-based lens
CN107076971A (en) * 2014-10-02 2017-08-18 松下知识产权经营株式会社 Zoom-lens system, camera device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2507368A1 (en) * 1974-02-28 1975-09-04 Asahi Optical Co Ltd WIDE ANGLE LENS
US4061421A (en) * 1975-06-30 1977-12-06 Olympus Optical Co., Ltd. Retrofocus type lens system having ultra-wide angle of view
US4740063A (en) * 1983-09-14 1988-04-26 Asahi Kogaku Kogyo Kabushiki Kaisha Telephoto zoom lens system
CN101876744A (en) * 2009-04-29 2010-11-03 鸿富锦精密工业(深圳)有限公司 Projection lens
CN107076971A (en) * 2014-10-02 2017-08-18 松下知识产权经营株式会社 Zoom-lens system, camera device
CN105445910A (en) * 2015-09-17 2016-03-30 上海大学 Super-large-field-of-view fish-eye lens having aspheric-structure-based lens

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