CN110376725B - Fisheye lens system - Google Patents
Fisheye lens system Download PDFInfo
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- CN110376725B CN110376725B CN201910677637.7A CN201910677637A CN110376725B CN 110376725 B CN110376725 B CN 110376725B CN 201910677637 A CN201910677637 A CN 201910677637A CN 110376725 B CN110376725 B CN 110376725B
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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
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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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
- G02B13/0055—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
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
Abstract
The invention relates to a fish-eye lens system in the technical field of applied optics, which sequentially comprises a front lens group with negative focal power and a rear lens group with positive focal power from an object space to an image space along the direction of an optical axis; the front lens group sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with positive focal power from an object side to an image side in the direction of an optical axis; the rear lens group sequentially comprises an aperture diaphragm, a seventh lens with positive focal power, an eighth lens with positive focal power, a ninth lens with negative focal power, a tenth lens with positive focal power, an eleventh lens with negative focal power, a twelfth lens with positive focal power and a thirteenth lens with positive focal power from the object side to the image side in the direction of the optical axis. The imaging quality meets the requirements through the mutual balance of the front lens group aberration and the rear lens group aberration.
Description
Technical Field
The invention relates to the field of applied optics, in particular to a fisheye lens system.
Background
Under the condition that the staring visual angle of the optical system is not large, the optical axis is enabled to do two-dimensional rotary scanning according to a certain rule in a certain range through an electromechanical structure and servo control, so that the angular space domain of information perception is increased. This is also the method of engineering to maximize the extended viewing angle.
In order to ensure the real-time performance of information acquisition, the splicing of a plurality of lenses as the field angle is another practical technology for expanding an information perception angular space domain, and is also a commonly used method at present. The technology adopts a staring imaging sensor with large view field and high resolution, an advanced electronic component circuit and a signal processing technology, and has the outstanding advantage that the real-time property of information acquisition is ensured in a view angle coverage airspace.
The rotation/step-and-scan technique requires sufficient time to acquire information, and the main drawback of this technique is the loss of "real-time" nature of information acquisition. The technology is also limited by factors such as the rotational inertia of the system, the frame angle of a rotary scanning mechanism and the like, so that the quick response performance of the technology is reduced, and the technical device cannot cover a full airspace without a blind area and has the defects of information loss and alarm leakage.
The multi-lens splicing technique is only suitable for expanding plane angles, and it is not practical to splice into a solid angle covering the full airspace by using an engineering method. Another disadvantage of this technique is the difficulty in terms of volume, weight, power consumption, etc.
Disclosure of Invention
The invention aims to provide a fisheye lens system, which enables the imaging quality to meet the requirement by a mode of mutual balance of the aberration of a front lens group and the aberration of a rear lens group.
The purpose of the invention is realized as follows: a fisheye lens system comprises a front lens group with negative focal power and a rear lens group with positive focal power in sequence from an object side to an image side along the direction of an optical axis;
the front lens group sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with positive focal power from an object side to an image side in the direction of an optical axis;
the rear lens group sequentially comprises an aperture diaphragm, a seventh lens with positive focal power, an eighth lens with positive focal power, a ninth lens with negative focal power, a tenth lens with positive focal power, an eleventh lens with negative focal power, a twelfth lens with positive focal power and a thirteenth lens with positive focal power from the object side to the image side in the direction of the optical axis.
Further, the third lens and the fourth lens are combined into a double cemented lens by means of cementing.
Further, the eighth lens and the ninth lens are combined into a double cemented lens by means of cementing.
Further, the eleventh lens and the twelfth lens are combined into a double cemented lens by means of cementing.
Furthermore, the field angle of the lens of the system is 180 degrees, the total focal length is 5.9887mm, the F number is 3.2, the total length is 232.408mm, the detectable wavelength range is 486nm-656nm, and the dominant wavelength is 588 nm.
Furthermore, the materials of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens and the thirteenth lens are respectively H-LAF52, H-LAF6LA, H-ZK7, H-ZF3, H-ZF6, H-LAF3B, H-ZK14, H-QK3L, H-ZF6, H-KF6, H-LAFL5, H-QK3L and H-ZF 6.
Further, the refractive index n of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, and thirteenth lenses is 1.7859, 1.7570, 1.6131, 1.7174, 1.7552, 1.7440, 1.6031, 1.4875, 1.7552, 1.5174, 1.7537, 1.4875, and 1.7552, respectively.
Furthermore, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens and the thirteenth lens are all spherical lenses.
The invention has the beneficial effects that:
1) the imaging quality meets the requirement by a mode of mutual balance of the aberration of the front lens group and the aberration of the rear lens group;
2) the fisheye lens system is composed of 13 spherical lenses, and processing is facilitated.
Drawings
FIG. 1 is a schematic view of the lens structure of the present invention.
Fig. 2 is a layout diagram of the optical path of the present invention.
FIG. 3 is a schematic MTF curve of the present invention.
Fig. 4 is a graph of field curvature versus distortion for the present invention.
Fig. 5 is a system dot diagram of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying figures 1-5 and the specific embodiments.
As shown in fig. 1-2, a fisheye lens system includes, in order from an object side to an image side in the direction of an optical axis, a front lens group having negative power and a rear lens group having positive power.
The front lens group includes, in order from the object side to the image side in the direction of the optical axis, a first lens 1 having negative refractive power, a second lens 2 having negative refractive power, a third lens 3 having negative refractive power, a fourth lens 4 having positive refractive power, a fifth lens 5 having positive refractive power, and a sixth lens 6 having positive refractive power.
The rear lens group includes, in order from the object side to the image side in the direction of the optical axis, an aperture stop 14, a seventh lens 7 of positive refractive power, an eighth lens 8 of positive refractive power, a ninth lens 9 of negative refractive power, a tenth lens 10 of positive refractive power, an eleventh lens 11 of negative refractive power, a twelfth lens 12 of positive refractive power, and a thirteenth lens 13 of positive refractive power.
The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens 10, the eleventh lens 11, the twelfth lens 12, and the thirteenth lens 13 are all spherical lenses.
The third lens 3 and the fourth lens 4 are combined into a double cemented lens by means of cementing; the eighth lens 8 and the ninth lens 9 are combined into a double cemented lens by means of cementing; the eleventh lens 11 and the twelfth lens 12 are combined into a double cemented lens by means of cementing.
The field angle of a lens of the system is 180 degrees, the total focal length is 5.9887mm, the F number is 3.2, the total length is 232.408mm, the detectable wavelength range is 486nm-656nm, and the dominant wavelength is 588 nm.
The materials of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens 10, the eleventh lens 11, the twelfth lens 12 and the thirteenth lens 13 are respectively H-LAF52, H-LAF6LA, H-ZK7, H-ZF3, H-ZF6, H-LAF3B, H-ZK14, H-QK3L, H-ZF6, H-KF6, H-LAFL5, H-QK3L and H-ZF 6.
The refractive indices n of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth and thirteenth lenses 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 and 13 are 1.7859, 1.7570, 1.6131, 1.7174, 1.7552, 1.7440, 1.6031, 1.4875, 1.7552, 1.5174, 1.7537, 1.4875 and 1.7552, respectively.
The optical system of the present invention has the structural parameters shown in table 1. And further optimizing and designing the initial structure obtained by the initial calculation through ZEMAX software to finally obtain the fisheye lens system with the field angle of 180 degrees, the image space F number of 3.2 and the visible light range. The system optical path layout diagram of the fisheye lens is shown in fig. 2, the MTF graph is shown in fig. 3, the field curvature and distortion graph is shown in fig. 4, and the imaging point sequence diagram is shown in fig. 5. As can be seen from fig. 3 to 5, the maximum curvature of field of the full-field lens is less than 0.037mm, the MTF index of the fisheye lens system can meet the requirement of general practical imaging, and the MTF value of the full-field lens is not less than 0.65 at a spatial frequency of 50 lp/mm. The lens structure disclosed by the invention can monitor or photograph the whole hemispherical airspace in real time, has particularly good imaging quality, can display clear images on the imaging surface 100, and can completely meet the monitoring or photographing requirements.
TABLE 1
The fisheye lens is designed primarily by a front group, then the total light path of the system is calculated, then a rear group system is designed primarily by the angle of view emitted by the front group and the relationship between the aberration balance of the front group and the aberration balance of the rear group, finally an initial structure is combined, then the initial structure is further optimized and designed by utilizing ZEMAX software, and finally the fisheye lens system with the angle of view of 180 degrees is obtained. The fisheye lens system is composed of 13 spherical lenses, and processing is facilitated. As can be seen from the basic aberration analysis chart, the imaging quality of the fish-eye lens can meet the requirements of general imaging quality.
While the preferred embodiments of the present invention have been described, those skilled in the art will appreciate that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A fisheye lens system comprising, in order from an object side to an image side in the direction of an optical axis, a front lens group having negative power and a rear lens group having positive power, characterized in that:
the front lens group sequentially comprises a first lens (1) with negative focal power, a second lens (2) with negative focal power, a third lens (3) with negative focal power, a fourth lens (4) with positive focal power, a fifth lens (5) with positive focal power and a sixth lens (6) with positive focal power from an object side to an image side in the direction of an optical axis;
the rear lens group sequentially comprises an aperture diaphragm (14), a seventh lens (7) with positive focal power, an eighth lens (8) with positive focal power, a ninth lens (9) with negative focal power, a tenth lens (10) with positive focal power, an eleventh lens (11) with negative focal power, a twelfth lens (12) with positive focal power and a thirteenth lens (13) with positive focal power from the object side to the image side in the direction of an optical axis;
the third lens (3) and the fourth lens (4) are combined into a double cemented lens in a cemented mode;
the eighth lens (8) and the ninth lens (9) are combined into a double cemented lens in a cemented mode;
the eleventh lens (11) and the twelfth lens (12) are combined into a double cemented lens by means of cementing.
2. A fish-eye lens system according to claim 1, wherein: the field angle of a lens of the system is 180 degrees, the total focal length is 5.9887mm, the F number is 3.2, the total length is 232.408mm, the detectable wavelength range is 486nm-656nm, and the dominant wavelength is 588 nm.
3. A fisheye lens system as claimed in claim 2, wherein: the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6), the seventh lens (7), the eighth lens (8), the ninth lens (9), the tenth lens (10), the eleventh lens (11), the twelfth lens (12) and the thirteenth lens (13) are respectively made of H-LAF52, H-LAF6LA, H-ZK7, H-ZF3, H-ZF6, H-LAF3B, H-ZK14, H-QK3L, H-ZF6, H-KF6, H-LAFL5, H-QK3L and H-ZF 6.
4. A fish-eye lens system according to claim 3, wherein: the refractive index n of the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6), the seventh lens (7), the eighth lens (8), the ninth lens (9), the tenth lens (10), the eleventh lens (11), the twelfth lens (12) and the thirteenth lens (13) is 1.7859, 1.7570, 1.6131, 1.7174, 1.7552, 1.7440, 1.6031, 1.4875, 1.7552, 1.5174, 1.7537, 1.4875 and 1.7552 respectively.
5. A fisheye lens system according to any one of claims 1-4 wherein: the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6), the seventh lens (7), the eighth lens (8), the ninth lens (9), the tenth lens (10), the eleventh lens (11), the twelfth lens (12) and the thirteenth lens (13) are all spherical lenses.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910677637.7A CN110376725B (en) | 2019-07-25 | 2019-07-25 | Fisheye lens system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910677637.7A CN110376725B (en) | 2019-07-25 | 2019-07-25 | Fisheye lens system |
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| CN110376725A CN110376725A (en) | 2019-10-25 |
| CN110376725B true CN110376725B (en) | 2021-03-12 |
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| CN112946865B (en) * | 2019-12-11 | 2022-08-23 | 信泰光学(深圳)有限公司 | Wide-angle lens |
| CN112859291B (en) * | 2021-02-01 | 2022-09-27 | 浙江舜宇光学有限公司 | Camera lens |
| CN113835202A (en) * | 2021-07-24 | 2021-12-24 | 上海大学 | Large-view-field hemispherical airspace fisheye lens system |
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| JP2016075741A (en) * | 2014-10-03 | 2016-05-12 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| CN108873258A (en) * | 2018-07-17 | 2018-11-23 | 莆田学院 | A kind of ultra-wide angle, large aperture FISH EYE LENS OPTICS system |
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| JP2007178894A (en) * | 2005-12-28 | 2007-07-12 | Canon Inc | Zoom lens and image projecting device having same |
| JP5006113B2 (en) * | 2007-06-12 | 2012-08-22 | 富士フイルム株式会社 | Wide angle zoom lens for projection and projection display device |
| JP5363084B2 (en) * | 2008-12-01 | 2013-12-11 | 富士フイルム株式会社 | Projection fisheye lens and projection display device using the same |
| TWI403755B (en) * | 2008-12-24 | 2013-08-01 | Young Optics Inc | Fixed-focus lens |
| CN101876744B (en) * | 2009-04-29 | 2011-11-09 | 鸿富锦精密工业（深圳）有限公司 | Projection lens |
| CN103149665A (en) * | 2011-12-07 | 2013-06-12 | 鸿富锦精密工业（深圳）有限公司 | Projection lens |
| CN105319672B (en) * | 2014-05-26 | 2019-07-12 | 奥林巴斯株式会社 | Wide-angle lens and photographic device with the wide-angle lens |
| US9939611B2 (en) * | 2014-12-10 | 2018-04-10 | Young Optics Inc. | Optical lens |
| CN208818915U (en) * | 2018-10-22 | 2019-05-03 | 厦门爱劳德光电有限公司 | A kind of 4K fish eye lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016075741A (en) * | 2014-10-03 | 2016-05-12 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| CN108873258A (en) * | 2018-07-17 | 2018-11-23 | 莆田学院 | A kind of ultra-wide angle, large aperture FISH EYE LENS OPTICS system |
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