CN108761735B - Super-large aperture wide-angle lens - Google Patents
Super-large aperture wide-angle lens Download PDFInfo
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- CN108761735B CN108761735B CN201810771472.5A CN201810771472A CN108761735B CN 108761735 B CN108761735 B CN 108761735B CN 201810771472 A CN201810771472 A CN 201810771472A CN 108761735 B CN108761735 B CN 108761735B
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- lens
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- 238000003384 imaging method Methods 0.000 claims abstract description 16
- 239000011521 glass Substances 0.000 claims abstract description 3
- 230000001681 protective effect Effects 0.000 claims abstract description 3
- 230000004075 alteration Effects 0.000 claims description 21
- 206010010071 Coma Diseases 0.000 claims description 5
- 201000009310 astigmatism Diseases 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 abstract description 24
- 230000003044 adaptive effect Effects 0.000 abstract 1
- 239000003086 colorant Substances 0.000 description 6
- 239000006059 cover glass Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
An oversized-aperture wide-angle lens, comprising, in order from an object side to an image side: a front lens group with negative focal power, a diaphragm, a rear lens group with positive focal power, a protective glass and an imaging surface; the front lens group comprises: at least three lenses having negative optical power and one lens having positive optical power; the rear lens group comprises: at least two lenses having positive optical power, at least one of which is a cemented lens. The invention provides an imaging lens with aperture smaller than 1.2, adaptive 1/1.8 target surface, infrared confocal and use environment temperature range of-40-80 ℃, which has smaller volume and weight in the same type of lens.
Description
Technical Field
The invention relates to a technology in the field of optical devices, in particular to a wide-angle lens with aperture less than 1.2.
Background
With the development of the imaging lens industry, the imaging quality requirement of the lens in an extremely low-light environment is higher and higher definition is required, and the image is required to be bright. The shot picture of the lens used in the prior art in an extremely dark environment is dark, the noise is large, the identification degree is low, and the market requirement cannot be met; in order to meet the requirements of clear imaging in extremely dark environments, the lens is required to have a large aperture and high pixels, so that the lens size and the lens caliber are increased, and the lens volume and the cost are increased.
Disclosure of Invention
The invention provides an ultra-large aperture wide-angle lens which aims at the defects in the prior art and has the characteristics of miniaturization, large target surface, high image quality, no heating and infrared confocal.
The invention is realized by the following technical scheme:
the invention comprises the following steps from an object side to an image side: the lens comprises a front lens group with negative focal power, a diaphragm, a rear lens group with positive focal power, protective glass and an imaging surface.
The front lens group comprises: at least three lenses having negative optical power and one lens having positive optical power.
The rear lens group comprises: at least two lenses having positive optical power, at least one of which is a cemented lens.
The refractive indexes of the first lens to the third lens with negative focal power are (1.8,1.9), (1.7, 1.8) and (1.6,1.7), the ratio of the focal length of the three lenses to the focal length of the whole lens is (-4.7, -5.8), (-3.1, -4.3) and (-4,5.2), and the volume and chromatic aberration can be reduced while ensuring a large visual angle.
The ratio of the focal length of the fourth lens to the integral focal length of the lens is (3.3,4.6), and the ratio of the focal length of the first lens after the diaphragm to the integral focal length of the lens is (4.8,6.8) so as to correct spherical aberration and coma under a large angle of view.
The ratio of the focal length of the front lens group to the overall focal length of the lens is (-2.3, -4.3); the ratio of the focal length of the rear lens group to the overall focal length of the lens is 1.5,3.3, so that a large angle of view is ensured.
The ratio of the focal length of the last lens of the lens to the integral focal length of the lens is 3.2,5.2, so as to correct the field curvature astigmatism of each field of view.
The ratio of the overall length of the lens to the effective focal length of the lens is (10,12.5) to limit the overall length of the lens.
The ratio of the image plane height of the lens to the effective focal length of the lens is (2.1,3) to limit the angular range of the lens.
Technical effects
Compared with the prior art, the invention provides the imaging lens with the aperture less than 1.2, the adaptation of 1/1.8 target surface, infrared confocal and the use environment temperature range of-40-80 ℃, which has smaller volume and weight in the same type of lens.
Drawings
FIG. 1 is a semi-sectional view of example 1;
FIG. 2 is an aberration diagram of example 1;
FIG. 3 is a graph of color difference of light ray in example 1;
FIG. 4 is a semi-sectional view of example 2;
FIG. 5 is an aberration diagram of example 2;
FIG. 6 is a graph of color difference of light ray in example 2;
FIG. 7 is a semi-sectional view of example 3;
FIG. 8 is an aberration diagram of example 3;
FIG. 9 is a graph showing the color difference of light in example 3;
in the figure: the image forming apparatus includes a front lens group G1, a diaphragm STP, a rear lens group G2, a cover glass CG, an image plane IMG, first to eighth lenses L1 to L8, a first front lens L61, a first rear lens L62, a second front lens L51, a second rear lens L52, a third front lens L63, a third rear lens L64, a fourth front lens L71, and a fourth rear lens L72.
Detailed Description
As shown in fig. 1, the present embodiment includes, in order from the object side to the image side: a front lens group G1 with negative focal power, a diaphragm STP, a rear lens group G2 with positive focal power, a cover glass CG and an imaging plane IMG.
The front lens group G1 sequentially includes: the first to third lenses L1 to L3 having negative optical power and the fourth lens L4 having positive optical power.
The rear lens group G2 sequentially comprises: a fifth lens L5 having positive optical power, a sixth lens L6 having positive optical power, and a seventh lens L7 having positive optical power.
The sixth lens L6 is a cemented lens, and includes: a first front lens L61 having negative power and a first rear lens L62 having positive power.
Table 1 lens structure parameters of the present embodiment
The ratio of the overall length of the lens to the effective focal length of the lens in this embodiment is 11.3; the ratio of the image plane height of the lens to the effective focal length of the lens is 2.65.
Wherein the second surface of the first front lens L61 of the sixth lens L6 is the first surface of the first rear lens L62.
As shown in fig. 2, the axial chromatic aberration, curvature of field and distortion of the embodiment are shown in the figure, and the axial chromatic aberration of the three colors red, green and blue of the embodiment is well corrected, so that clear imaging can be realized; the axial chromatic aberration of infrared light is well corrected, and infrared confocal is realized; the field curvature curve shows that the T line and the S line are well converged, the field curvature and the astigmatism are excellent, and the requirement of uniform imaging of the whole picture is ensured; the distortion curve shows that the lens achieves no distortion.
As shown in fig. 3, a light color difference chart is shown, and according to the chart, the embodiment well corrects the chromatic aberration of magnification and coma aberration of red, green and blue colors, so as to meet the requirement of high pixels.
Example 2
As shown in fig. 4, in the present embodiment, compared with embodiment 1, the rear lens group G2 includes, in order: a fifth lens L5 having positive optical power and a sixth lens L6 having positive optical power.
The fifth lens L5 is a cemented lens, and includes: a second front lens L51 having negative optical power and a second rear lens L52 having positive optical power.
The sixth lens L6 is a cemented lens, and includes: a third front lens L63 having positive optical power and a third rear lens L64 having negative optical power.
Table 2 lens structure parameters of the present embodiment
The ratio of the overall length of the lens to the effective focal length of the lens in this embodiment is 12.2; the ratio of the image plane height of the lens to the effective focal length of the lens is 2.2.
The second surface of the second front lens L51 of the fifth lens L5 is the first surface of the second rear lens L52, and the second surface of the third front lens L63 of the sixth lens L6 is the first surface of the third rear lens L64.
As shown in fig. 5, the axial chromatic aberration, curvature of field and distortion of the embodiment are shown in the figure, and the axial chromatic aberration of the three colors red, green and blue of the embodiment is well corrected, so that clear imaging can be achieved; the axial chromatic aberration of infrared light is well corrected, and infrared confocal is realized; the field curvature curve shows that the T line and the S line are well converged, the field curvature and the astigmatism are excellent, and the requirement of uniform imaging of the whole picture is ensured; the distortion curve shows that the lens achieves no distortion.
As shown in fig. 6, a light color difference chart is shown, and according to the chart, the embodiment well corrects the chromatic aberration of magnification and coma aberration of red, green and blue colors, so as to meet the requirement of high pixels.
Example 3
As shown in fig. 7, the present embodiment includes, in order from the object side to the image side: a front lens group G1 with negative focal power, a diaphragm STP, a rear lens group G2 with positive focal power, a cover glass CG and an imaging plane IMG.
The front lens group G1 sequentially includes: the first to third lenses L1 to L3 having negative optical power, the fourth lens L4 having positive optical power, and the fifth lens L5 having negative optical power.
The rear lens group G2 sequentially comprises: a sixth lens L6 having positive optical power, a seventh lens L7 having positive optical power, and an eighth lens L8 having positive optical power.
The seventh lens L7 is a cemented lens, and comprises: a fourth front lens L71 having negative power and a fourth rear lens L72 having positive power.
Table 3 lens structure parameters of the present embodiment
The ratio of the overall length of the lens to the effective focal length of the lens in this embodiment is 10.8; the ratio of the image plane height of the lens to the effective focal length of the lens is 2.7.
The second surface of the fourth front lens L71 of the seventh lens L7 is the first surface of the fourth rear lens L72.
As shown in fig. 8, the axial chromatic aberration, curvature of field and distortion of the embodiment are shown in the figure, and the axial chromatic aberration of the three colors red, green and blue of the embodiment is well corrected, so that clear imaging can be achieved; the axial chromatic aberration of infrared light is well corrected, and infrared confocal is realized; the field curvature curve shows that the T line and the S line are well converged, the field curvature and the astigmatism are excellent, and the requirement of uniform imaging of the whole picture is ensured; the distortion curve shows that the lens achieves no distortion.
As shown in fig. 9, a light color difference chart is shown, and according to the chart, the embodiment well corrects the chromatic aberration of magnification and coma aberration of red, green and blue colors, so as to meet the requirement of high pixels.
The foregoing embodiments may be partially modified in numerous ways by those skilled in the art without departing from the principles and spirit of the invention, the scope of which is defined in the claims and not by the foregoing embodiments, and all such implementations are within the scope of the invention.
Claims (5)
1. The ultra-large aperture wide-angle lens is characterized by sequentially comprising a front lens group with negative focal power, a diaphragm, a rear lens group with positive focal power, protective glass and an imaging surface from an object side to an image side; the front lens group consists of at least three lenses with negative focal power and one lens with positive focal power; the rear lens group consists of at least two lenses with positive focal power, wherein at least one lens is a cemented lens;
the front lens group consists of a first lens, a second lens, a third lens and a fourth lens, wherein the first lens, the second lens, the third lens and the fourth lens are provided with negative focal power; or the front lens group consists of a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are respectively provided with negative focal power, the rear lens group consists of a sixth lens, a seventh lens and an eighth lens, the sixth lens, the seventh lens and the eighth lens are respectively provided with positive focal power;
the aperture of the ultra-large aperture wide-angle lens is smaller than 1.2;
the refractive indexes of the first lens to the third lens with negative focal power are respectively [1.7725,1.9 ], [1.7 ], 1.8 ], [ 1.6,1.7 ], and the ratio of the focal length of the first lens to the third lens to the focal length of the whole lens is (-5.8, -4.7), (-4.3, -3.1), (-5.2, -4);
the ratio of the focal length of the front lens group to the overall focal length of the lens is (-4.3, -2.3); the ratio of the focal length of the rear lens group to the focal length of the lens is (1.5,3.3).
2. The ultra-large aperture wide-angle lens of claim 1, wherein the ratio of the focal length of the fourth lens element to the overall focal length of the lens element is (3.3,4.6), and the ratio of the focal length of the first lens element after the diaphragm to the overall focal length of the lens element is (4.8,6.8) to correct spherical aberration and coma under a large angle of view.
3. The ultra-large aperture wide angle lens as recited in claim 1, wherein a ratio of a focal length of a last lens of the lens to an overall focal length of the lens is (3.2,5.2) to correct for astigmatism of field of each field of view.
4. The ultra-large aperture wide angle lens of claim 1, wherein the ratio of the overall length of the lens to the effective focal length of the lens is (10,12.5) to limit the overall length of the lens.
5. The ultra-large aperture wide angle lens of claim 1, wherein the ratio of the image plane height of the lens to the effective focal length of the lens is (2.1,3) to limit the angular range of the lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810771472.5A CN108761735B (en) | 2018-07-13 | 2018-07-13 | Super-large aperture wide-angle lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810771472.5A CN108761735B (en) | 2018-07-13 | 2018-07-13 | Super-large aperture wide-angle lens |
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| Publication Number | Publication Date |
|---|---|
| CN108761735A CN108761735A (en) | 2018-11-06 |
| CN108761735B true CN108761735B (en) | 2024-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810771472.5A Active CN108761735B (en) | 2018-07-13 | 2018-07-13 | Super-large aperture wide-angle lens |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114675405B (en) * | 2022-05-27 | 2022-10-25 | 江西联创电子有限公司 | Optical lens |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0980303A (en) * | 1995-09-19 | 1997-03-28 | Asahi Seimitsu Kk | Super wide-angle lens system |
| JP2004102162A (en) * | 2002-09-12 | 2004-04-02 | Minolta Co Ltd | Superwide-angle lens |
| JP2010008917A (en) * | 2008-06-30 | 2010-01-14 | Fujinon Corp | Variable-power optical system and imaging apparatus |
| CN104330873A (en) * | 2014-11-29 | 2015-02-04 | 福建福光数码科技有限公司 | Day and night high-resolution fish-eye lens |
| CN106226889A (en) * | 2016-08-25 | 2016-12-14 | 厦门爱劳德光电有限公司 | A kind of 12,000,000 pixel fish eye lenses |
| CN206920686U (en) * | 2017-05-27 | 2018-01-23 | 深圳市东正光学技术有限公司 | Panorama fish eye lens |
| CN208689246U (en) * | 2018-07-13 | 2019-04-02 | 嘉兴中润光学科技有限公司 | Super large aperture wide-angle lens |
-
2018
- 2018-07-13 CN CN201810771472.5A patent/CN108761735B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0980303A (en) * | 1995-09-19 | 1997-03-28 | Asahi Seimitsu Kk | Super wide-angle lens system |
| JP2004102162A (en) * | 2002-09-12 | 2004-04-02 | Minolta Co Ltd | Superwide-angle lens |
| JP2010008917A (en) * | 2008-06-30 | 2010-01-14 | Fujinon Corp | Variable-power optical system and imaging apparatus |
| CN104330873A (en) * | 2014-11-29 | 2015-02-04 | 福建福光数码科技有限公司 | Day and night high-resolution fish-eye lens |
| CN106226889A (en) * | 2016-08-25 | 2016-12-14 | 厦门爱劳德光电有限公司 | A kind of 12,000,000 pixel fish eye lenses |
| CN206920686U (en) * | 2017-05-27 | 2018-01-23 | 深圳市东正光学技术有限公司 | Panorama fish eye lens |
| CN208689246U (en) * | 2018-07-13 | 2019-04-02 | 嘉兴中润光学科技有限公司 | Super large aperture wide-angle lens |
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| CN108761735A (en) | 2018-11-06 |
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Address after: 314000 No.188, Taojing Road, Gaozhao street, Xiuzhou District, Jiaxing City, Zhejiang Province Applicant after: Jiaxing Zhongrun Optical Technology Co.,Ltd. Address before: 314000 Room 2F201-6, Building 6, Jiaxing Photovoltaic Science Park, 1288 Kanghe Road, Xiuzhou District, Jiaxing City, Zhejiang Province Applicant before: JIAXING ZHONGRUN OPTICAL SCIENCE AND TECHNOLOGY Co.,Ltd. |
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