CN105044886B - Wide-angle camera - Google Patents
Wide-angle camera Download PDFInfo
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- CN105044886B CN105044886B CN201510587416.2A CN201510587416A CN105044886B CN 105044886 B CN105044886 B CN 105044886B CN 201510587416 A CN201510587416 A CN 201510587416A CN 105044886 B CN105044886 B CN 105044886B
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- 239000000463 material Substances 0.000 claims description 25
- 238000003384 imaging method Methods 0.000 claims description 16
- 239000005308 flint glass Substances 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 7
- 229910052746 lanthanum Inorganic materials 0.000 claims description 4
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 abstract description 5
- 230000003287 optical effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005355 lead glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The invention discloses a kind of wide-angle camera, including the first lens, the second lens, aperture diaphragm, the 3rd lens and the 4th lens, wherein, the thing side surface of the first lens is concave surface, and image side surface is concave surface, and with negative focal power；The thing side surface of the second lens is convex surface, and image side surface is concave surface, and with positive focal power；The thing side surface of the 3rd lens and image side surface are convex surface, and with positive focal power, the thing side surface of the 4th lens is concave surface, and image side surface is convex surface, and with negative focal power；Aperture diaphragm is located between the second lens and the 3rd lens.The wide-angle camera ensure that has excellent image quality in the case of big visual angle, and the picture rich in detail of full interface 1080P more than 2 mega pixels can be provided for camera systems such as IPCamaera.
Description
Technical Field
The invention relates to a network monitoring camera lens, in particular to a wide-angle camera lens.
Background
Lenses of digital image products (such as video cameras, digital cameras, etc.) can be classified into three types, namely, standard lenses, short-focus (wide-angle) lenses and long-focus (telephoto) lenses according to the focal length or the field of view. The wide-angle lens is a short-focal-length lens, and the longer the focal length is, the smaller the visual angle is and the smaller the shooting range is; the shorter the focal length is, the larger the angle of view is, and the larger the shooting range is. The wide-angle lens can enlarge the shooting visual field and shoot a panoramic or large-scene picture in a limited distance range. For example, the wide-angle lens is adopted in the video camera to enable all the clients performing network video to be captured in the network video, so that network video communication users can achieve a real communication effect.
The existing wide-angle lens generates a plurality of aberrations, which cause image blurring and defocusing. To overcome the above aberrations, lens designers must use many lenses in the lens to compensate. Generally, the lens is too long or too short, which makes the design difficult and requires high process requirements during manufacturing, resulting in high cost of the lens while improving the imaging quality.
Disclosure of Invention
The invention aims to provide a wide-angle pick-up lens.
According to an aspect of the present invention, there is provided a wide-angle imaging lens including a first lens, a second lens, an aperture stop, a third lens, and a fourth lens arranged in this order from an object side to an image side, wherein,
the object side surface of the first lens is a concave surface, the image side surface of the first lens is a concave surface, and the first lens has negative focal power;
the object side surface of the second lens is a convex surface, the image side surface of the second lens is a concave surface, and the second lens has positive focal power;
the object side surface and the image side surface of the third lens are convex and have positive focal power,
the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a convex surface, and the fourth lens has negative focal power;
the aperture stop is located between the second lens and the third lens.
By adopting the wide-angle camera lens adopting the technical scheme, excellent imaging quality is ensured under the condition of a large visual angle. The wide-angle camera lens can provide a clear image with a 1080P full interface of more than 2 million pixels for camera systems such as IPCamera and the like.
In some embodiments, the third lens and the fourth lens form a cemented optic.
In some embodiments, the focal length f34 of the cemented lens satisfies: 4.32mm < f34<7.33 mm.
In some embodiments, the following conditional formula is satisfied:
(1)-0.95<f/f1<-0.68；
(2)0.3<f/f2<0.5；
(3)0.5<f/f34<0.8；
wherein,
f is the focal length of the whole system; f1 is the focal length of the first lens; f2 is the focal length of the second lens; f34 is the combined focal length of the third and fourth lenses.
Reasonable focal power distribution ensures that the ultra-wide angle lens has simple structure and easy processing, thereby reducing the cost.
In some embodiments, the first lens, the second lens, the third lens and the fourth lens are all made of glass materials. The materials of the lens are processing raw materials commonly used in the optical lens industry, so that the wide-angle camera lens is lower in cost.
In some embodiments, the third lens is made of heavy lanthanum flint glass material; the fourth lens is made of a heavy flint glass material.
In some embodiments, the refractive index Nd2 of the material and the abbe constant Vd2 of the material of the second lens satisfy the following conditions: nd2 is more than 1.85; vd2 < 42.
In some embodiments, the refractive index Nd4 of the material and the abbe constant Vd4 of the material of the fourth lens satisfy the following conditions: nd4 is more than 1.90; vd 4< 22.
Drawings
Fig. 1 is a schematic structural diagram of a wide-angle imaging lens according to an embodiment of the present invention.
Fig. 2 is an optical system diagram of the wide-angle imaging lens shown in fig. 1.
Fig. 3 is a graph showing curvature of field and distortion of the wide-angle imaging lens shown in fig. 1.
Fig. 4 is a graph of a transfer function of the wide-angle imaging lens shown in fig. 1.
Fig. 5 is a diagram showing relative illuminance of the wide-angle imaging lens shown in fig. 1.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Fig. 1 to 5 schematically show a wide-angle imaging lens according to an embodiment of the present invention, which has a lens focal length F of 3.80mm, F/NO of 2.50, and 2 ω of 130. As shown in the figure, the device comprises a first lens 1, a second lens 2, an aperture stop 5, a third lens 3, a fourth lens 4 and a protective lens 6 which are arranged in sequence from the object side to the image side. .
The object-side surface 11 and the image-side surface 12 of the first lens element 1 are concave and have negative refractive power.
The second lens element 2 has a convex object-side surface 21 and a concave image-side surface 22, and has positive optical power.
The object-side surface 31 and the image-side surface 32 of the third lens 3 are both convex and have positive optical power.
The fourth lens element 4 has a concave object-side surface 41 and a convex image-side surface 42, and has negative refractive power.
The aperture stop 5 is located between the second lens 2 and the third lens 3, and is close to the object-side surface 31 of the third lens 3.
The third lens 3 and the fourth lens 4 constitute a cemented lens.
The first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 are all made of glass materials. Wherein, the third lens 3 is made of heavy lanthanum flint glass material. The fourth lens 4 is made of a heavy flint glass material. The first lens 1 and the second lens 2 can be made of heavy lanthanum flint glass material or heavy flint glass material, and can also be made of glass materials such as lead glass, neodymium glass, titanium glass, niobium glass and the like.
The wide-angle camera lens meets the following conditional expression:
(1)-0.95<f/f1<-0.68；(2)0.3<f/f2<0.5；(3)0.5<f/f34<0.8；
wherein f is the focal length of the whole system; f1 is the focal length of the first lens; f2 is the focal length of the second lens; f34 is the combined focal length of the third and fourth lenses.
The detailed parameters of the wide-angle camera lens are as follows:
in the present embodiment, the focal length f34 of the cemented lens is 6.53mm
In other embodiments, the focal length f34 of the cemented lens may also be 4.32mm, 5.37, or 7.33 mm.
In other embodiments, the refractive index Nd2 of the material of the second lens 2 may be 1.91 or 2.33, and the abbe constant Vd2 of the material may be 40 or 38. The refractive index Nd4 of the material of the fourth lens 4 may be 1.93, 2.13 or 2.37, and the abbe constant Vd4 of the material may be 21, 19 or 13.
By adopting the wide-angle camera lens adopting the technical scheme, excellent imaging quality is ensured under the condition of a large visual angle. The wide-angle camera lens can provide a clear image with a 1080P full interface of more than 2 million pixels for camera systems such as IPCamera and the like.
The foregoing are only some embodiments of the invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (7)
1. The wide-angle camera lens is characterized by comprising a first lens, a second lens, an aperture diaphragm, a third lens and a fourth lens which are arranged in sequence from an object side to an image side, wherein,
the object side surface of the first lens is a concave surface, the image side surface of the first lens is a concave surface, and the first lens has negative focal power;
the object side surface of the second lens is a convex surface, the image side surface of the second lens is a concave surface, and the second lens has positive focal power;
the object side surface and the image side surface of the third lens are convex surfaces and have positive focal power,
the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a convex surface, and the fourth lens has negative focal power;
the aperture diaphragm is positioned between the second lens and the third lens;
the lens meets the following conditional expression:
(1)-0.95<f/f1<-0.68；
(2)0.3<f/f2<0.5；
(3)0.5<f/f34<0.8；
wherein f is the focal length of the whole system; f1 is the focal length of the first lens; f2 is the focal length of the second lens; f34 is the combined focal length of the third and fourth lenses.
2. The wide-angle imaging lens according to claim 1, wherein the third lens and the fourth lens constitute a cemented lens.
3. The wide-angle imaging lens according to claim 2, wherein a focal length f34 of the cemented lens satisfies: 4.32mm < f34<7.33 mm.
4. The wide-angle imaging lens according to claim 1, wherein the first lens, the second lens, the third lens, and the fourth lens are each made of a glass material.
5. The wide-angle imaging lens according to claim 4,
the third lens is made of heavy lanthanum flint glass material;
the fourth lens is made of a heavy flint glass material.
6. The wide-angle imaging lens according to claim 1, 2, 3, 4, or 5, wherein a material refractive index Nd2 and a material abbe constant Vd2 of the second lens satisfy the following conditions: nd2 was 1.88, 1.91 or 2.33, Vd2 was 41, 40 or 38.
7. The wide-angle imaging lens according to claim 1, 2, 3, 4, or 5, wherein a material refractive index Nd4 and a material abbe constant Vd4 of the fourth lens satisfy the following conditions: nd4 is 1.92, 1.93, 2.13 or 2.37 and Vd4 is 21, 19 or 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510587416.2A CN105044886B (en) | 2015-09-15 | 2015-09-15 | Wide-angle camera |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510587416.2A CN105044886B (en) | 2015-09-15 | 2015-09-15 | Wide-angle camera |
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| CN105044886A CN105044886A (en) | 2015-11-11 |
| CN105044886B true CN105044886B (en) | 2017-07-07 |
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| CN201510587416.2A Active CN105044886B (en) | 2015-09-15 | 2015-09-15 | Wide-angle camera |
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| TWI688786B (en) | 2019-03-26 | 2020-03-21 | 大立光電股份有限公司 | Optical imaging system, image capturing unit and electronic device |
| CN113759509B (en) * | 2021-09-14 | 2022-09-30 | 浙江舜宇光学有限公司 | Optical imaging lens |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204925497U (en) * | 2015-09-15 | 2015-12-30 | 中山市弘景光电科技有限公司 | Imagery orthostigmat |
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| JP3438552B2 (en) * | 1997-11-10 | 2003-08-18 | ミノルタ株式会社 | Zoom lens device |
| TWI416196B (en) * | 2011-04-15 | 2013-11-21 | Largan Precision Co Ltd | Optical lens assembly for image taking |
| JP5806737B2 (en) * | 2011-07-29 | 2015-11-10 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
| CN103814323B (en) * | 2011-07-29 | 2016-03-30 | 富士胶片株式会社 | Imaging lens and imaging device |
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| CN204925497U (en) * | 2015-09-15 | 2015-12-30 | 中山市弘景光电科技有限公司 | Imagery orthostigmat |
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Address after: 528400 Zhongshan Province, the Torch Development Zone, Guangdong venture Road, No. twentieth, building fifth, floor 18 Applicant after: Guangdong Hongjing Optoelectronics Technology Co., Ltd. Address before: 528400 Zhongshan Province, the Torch Development Zone, Guangdong venture Road, No. twentieth, building fifth, floor 18 Applicant before: ZHONGSHAN HONGJING OPTICAL TECHNOLOGY Co.,Ltd. |
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