CN116582738B - Long-focus large-aperture short-flange video lens with focal length of 85mm - Google Patents
Long-focus large-aperture short-flange video lens with focal length of 85mm Download PDFInfo
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- CN116582738B CN116582738B CN202310854598.XA CN202310854598A CN116582738B CN 116582738 B CN116582738 B CN 116582738B CN 202310854598 A CN202310854598 A CN 202310854598A CN 116582738 B CN116582738 B CN 116582738B
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- 230000003287 optical effect Effects 0.000 claims abstract description 24
- 239000006185 dispersion Substances 0.000 abstract description 7
- 238000004026 adhesive bonding Methods 0.000 description 7
- 230000004075 alteration Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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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
-
- 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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Lenses (AREA)
Abstract
The invention relates to a long-focus large-aperture short-flange video lens with a focal length of 85mm, which comprises a first lens group, an iris diaphragm and a second lens group which are sequentially arranged along the incidence direction of light rays of a light path; the first lens group is an immovable fixed group, has positive focal power and consists of 5 lenses which are sequentially arranged along the incidence direction of light rays of the light path, wherein the first three lenses form a group of three cemented lenses, and the second two lenses form a group of double cemented lenses; the second lens group is a movable focusing group, has positive focal power and is composed of 8 lenses which are sequentially arranged along the incidence direction of light rays of the light path; and the first lens group and the second lens group satisfy 1.7< f1/f2<2.3, and f1 and f2 are focal length values of the first and second lens groups, respectively. The optical system of the lens meets the requirements of large aperture, high resolution, small distortion, low dispersion and near-end shooting in the whole working distance, has small optical total length, and can also meet the requirement of a camera module matched with a shorter flange back focus.
Description
Technical Field
The invention belongs to the technical field of photographic lenses, and particularly relates to a long-focus large-aperture short-flange video lens with a focal length of 85 mm.
Background
With the rapid development of socioeconomic, the demands of people on film and television and self-media are increasing, and the scene demand of video shooting is increasing, so that the index parameter requirements on video shots are continuously improved. Important indexes of the long-focus video lens are large aperture, high resolution, small distortion, low dispersion and near-end shooting.
But the applicant found that: the defects of insufficient resolution, insufficient aperture, insufficient distortion, large dispersion, insufficient near-end shooting and the like of a long Jiao Shipin lens commonly exist in the current market, and the high requirements of the long-focus film shooting market demand are not met, especially a long-focus video lens with a focal length of 85 mm.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a long-focus large-aperture short-flange video lens with a focal length of 85 mm.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a long-focus large-aperture short-flange video lens with a focal length of 85mm, which comprises a first lens group, an iris diaphragm and a second lens group which are sequentially arranged along the incidence direction of light rays of a light path; wherein,,
the first lens group is used as an immovable fixed group, the focal power is positive, the first lens group is composed of 5 lenses which are sequentially arranged along the incidence direction of light rays of an optical path, the first three lenses in the 5 lenses form a group of three-gluing lenses, and the second two lenses form a group of double-gluing lenses;
the second lens group is used as a movable focusing group, the focal power is positive, and the second lens group is composed of 8 lenses which are sequentially arranged along the incidence direction of light rays of the light path;
and the first lens group and the second lens group satisfy the following formula:
1.7<f1/f2<2.3
wherein f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group.
Further, the first six lenses of the 8 lenses of the second lens group respectively form three groups of double-glued lenses.
Further, the refractive index of the first lens group is more than 1.8 and less than 1.9, and the refractive index of the second lens group is more than 1.5 and less than 1.6.
Further, the abbe number of at least three lenses of the first lens group is larger than 20 and smaller than 30, and the abbe number of at least two lenses of the second lens group is larger than 30 and smaller than 40.
Further, the structure of the optical system constituted by the first lens group and the second lens group is specifically as follows:
further, the total length of the optical system constituted by the first lens group and the second lens group is greater than 128 mm and less than 132 mm.
The invention has the beneficial effects that:
1. according to the invention, through adopting the optimized combination of 13 standard spherical lenses, the Jiao Shipin lens with the focal length of 85mm is obtained, and the optical system of the lens meets the requirements of large aperture, high resolution, small distortion, low dispersion and near-end shooting in the whole working distance.
2. The invention optimizes the total optical length by adopting a compact optical structure, so that the total length of an optical system formed by the first lens group G1 and the second lens group G2 is more than 128 mm and less than 132 mm, and the total optical length is reduced; and simultaneously, the camera module matched with the rear focus of the shorter flange can be met.
Drawings
FIG. 1 is a schematic diagram of a long-focus large-aperture short-flange video lens with a focal length of 85 mm;
FIG. 2 is a longitudinal aberration diagram of a long focus large aperture short flange video lens test with a focal length of 85mm according to an embodiment of the present invention;
FIG. 3 is a graph of lateral chromatic aberration for a long-focus large-aperture short-flange video lens test with a focal length of 85mm according to an embodiment of the present invention;
FIG. 4 is a graph of distortion of field curvature for a long focus large aperture short flange video lens test with a focal length of 85mm according to an embodiment of the present invention;
FIG. 5 is a graph of MTF defocus for a long focus large aperture short flange video lens test with a focal length of 85mm according to an embodiment of the present invention;
FIG. 6 is a graph of MTF for a long focus large aperture short flange video lens test with a focal length of 85mm according to an embodiment of the present invention;
FIG. 7 is a graph of relative illuminance for a long focus large aperture short flange video lens test with a focal length of 85mm according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a long-focus large-aperture short-flange video lens with a focal length of 85mm is sequentially provided with a first lens group G1, an iris S and a second lens group G2 along the light incident direction of a light path. Wherein,,
the first lens group G1 is used as an immovable fixed group, the focal power is positive, the first lens group is composed of 5 lenses which are sequentially arranged along the incidence direction of light rays of an optical path, the first three lenses in the 5 lenses form a group of three-gluing lenses, and the second two lenses form a group of double-gluing lenses; specifically, the first lens group G1 is composed of lenses L1 to L5 sequentially arranged along the object side end to the camera connection end, wherein the lenses L1 to L3 form a group of three-cemented lenses, and the lenses L4 and L5 form a group of two-cemented lenses.
The second lens group G2 is used as a movable focusing group, the focal power is positive, the second lens group is composed of 8 lenses which are sequentially arranged along the incidence direction of light rays of an optical path, and the first six lenses in the 8 lenses respectively form three groups of double-glued lenses; specifically, the second lens group G2 is composed of lenses L6 to L13 sequentially arranged along the direction from the object side end to the camera connection end, wherein the lens L6 and the lens L7, the lens L8 and the lens L9, and the lens L10 and the lens L11 respectively form a double cemented lens, and three groups are formed.
And the first lens group and the second lens group satisfy the following formula:
1.7<f1/f2<2.3
wherein f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group. If the focal length values of the first lens group and the second lens group do not meet the formula, the back working distance of the optical system is too long, and the camera module matched with the back focus of the short flange cannot be met.
When the long-focus large-aperture short-flange video lens with the focal length of 85mm works, the first lens group G1 is fixed when an object moves from infinity to a close distance, and the second lens group G2 moves towards the object when the object moves from infinity to the close distance, so that focusing is realized.
According to the invention, through adopting 13G (13 standard spherical lenses) optimization combination, a long Jiao Shipin lens with a focal length of 85mm is obtained, and an optical system of the lens meets the requirements of large aperture, high resolution, small distortion, low dispersion and near-end shooting in the whole working distance, and specifically comprises the following steps: under the condition that the focal length values of the first lens group G1 and the second lens group G2 meet 1.7< f1/f2<2.3, the first lens group G1 adopts a structure of a group of three-gluing lenses and a group of double-gluing lenses, so that the MTF resolution and the mass production assembly fine rate are effectively improved, chromatic aberration is optimized through the combined action of the three groups of double-gluing lenses of the second lens group G2, chromatic dispersion is reduced, and distortion is effectively reduced through the overall symmetrical structure of the front group and the rear group of the lens lenses; therefore, the five groups of cemented lenses can optimize the good chromatic aberration of the lens and reduce the sensitivity of assembly tolerance.
In one possible implementation, the refractive index of the first lens group G1 is greater than 1.8 and less than 1.9, and the refractive index of the second lens group G2 is greater than 1.5 and less than 1.6; as shown in fig. 1, the refractive index of the 2 nd, 3 rd and 5 th lenses (i.e., lens L2, lens L3 and lens L5) of the first lens group G1 is greater than 1.8 and smaller than 1.9, and the refractive index of the 6 th, 7 th, 10 th and 12 th lenses (i.e., lens L6, lens L7, lens L10 and lens L12) of the second lens group G2 is greater than 1.5 and smaller than 1.6, so that a compact short flange optical structure and an imaging aperture with large light flux are realized by the combination of the lenses with different refractive indexes of the first lens group G1 and the second lens group G2.
The abbe number of the first lens group G1 with at least three lenses is more than 20 and less than 30, and the abbe number of the second lens group G2 with at least two lenses is more than 30 and less than 40; as shown in fig. 1, the abbe numbers of the 2 nd, 3 rd and 5 th lenses (i.e., lens L2, lens L3 and lens L5) of the first lens group G1 are larger than 20 and smaller than 30, and the abbe numbers of the 9 th and 11 th lenses (i.e., lens L9 and lens L11) of the second lens group G2 are larger than 30 and smaller than 40. The five lenses can be used for correcting imaging chromatic aberration under the large aperture more effectively, and can be used for further improving high resolution and contrast performance under the large aperture.
In addition, the total length of the optical system of the existing 85mm long-focus video lens in the market is generally more than or equal to 150 mm; as shown in FIG. 1, the first lens group G1, the iris S and the second lens group G2 are adopted, so that the total length of an optical system formed by the first lens group G1 and the second lens group G2 is larger than 128 mm and smaller than 132 mm, the total optical length is reduced, a lens with a more compact optical structure is obtained, the overall size of the lens is smaller, the lens is more portable when being used, and the camera module matched with a shorter flange back focal length can be satisfied, as shown in FIG. 1, the flange back focal length 100 of the camera module is about 30mm, and the flange back focal length of the existing 85mm long focal length video lens in the market is more than Jiao Duowei mm.
The long-focus large-aperture short-flange video lens with the focal length of 85mm is further described below by means of an embodiment.
Examples
The video lens according to the embodiment of the present invention includes the first lens group G1, the iris S, and the second lens group G2 shown in fig. 1, and the structures of the first lens group G1 and the second lens group G2 are as described above and will not be repeated here. The structure of the optical system of the present embodiment, which is composed of the first lens group G1 and the second lens group G2, is specifically shown in table 1 below.
TABLE 1
The overall specifications of the optical system of the embodiment of the present invention composed of the first lens group G1 and the second lens group G2 are shown in table 2 below.
TABLE 2
When an object moves from infinity to a close distance, the present embodiment is fixed by the first lens group G1, and the second lens group G2 moves toward the object direction, so as to achieve focusing, and satisfy the requirements of a large aperture (see fig. 7, which is a graph of the relative illuminance of the video lens of the present embodiment to the light source with a wavelength of 0.546000 μm), high resolution (see fig. 5 and 6), small distortion (see fig. 4, which is a graph of the field curvature distortion of the video lens of the present embodiment to the light source with a wavelength of 0.435 μm at a maximum field of 21.5000 mm), low dispersion (see fig. 2 and 3, in which fig. 2 is a graph of the longitudinal aberration of the video lens of the present embodiment to the light source with a wavelength of 0.435 μm at a pupil radius of 24.2267 mm, and fig. 3 is a graph of the lateral aberration of the video lens of the present embodiment to the light source with a wavelength of 0.546000 μm at a maximum field of 21.5000 mm), and photographing.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (1)
1. The long-focus large-aperture short-flange video lens with the focal length of 85mm is characterized by comprising a first lens group, an iris diaphragm and a second lens group which are sequentially arranged along the incidence direction of light rays of a light path; wherein,,
the first lens group is used as an immovable fixed group, the focal power is positive, the first lens group is composed of 5 lenses which are sequentially arranged along the incidence direction of light rays of an optical path, the first three lenses in the 5 lenses form a group of three cemented lenses, the second two lenses form a group of two cemented lenses, the first lens group at least has refractive indexes of three lenses which are more than 1.8 and less than 1.9, and the first lens group at least has Abbe numbers of three lenses which are more than 20 and less than 30;
the second lens group is used as a movable focusing group, the focal power is positive, the second lens group is composed of 8 lenses which are sequentially arranged along the incidence direction of light rays of an optical path, the first six lenses in the 8 lenses of the second lens group respectively form three groups of double-glued lenses, the refractive index of at least four lenses of the second lens group is larger than 1.5 and smaller than 1.6, and the Abbe number of at least two lenses of the second lens group is larger than 30 and smaller than 40;
and the first lens group and the second lens group satisfy the following formula:
1.7<f1/f2<2.3
wherein f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group;
the total length of the optical system composed of the first lens group and the second lens group is greater than 128 mm and less than 132 mm.
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| CN202310854598.XA CN116582738B (en) | 2023-07-13 | 2023-07-13 | Long-focus large-aperture short-flange video lens with focal length of 85mm |
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| CN118131452B (en) * | 2024-05-10 | 2024-07-16 | 珠海市川富光学技术有限公司 | Middle-focus large-aperture short-flange video lens |
| CN118244464B (en) * | 2024-05-20 | 2024-07-19 | 珠海市川富光学技术有限公司 | Long-focus short-flange video lens |
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| US8000023B2 (en) * | 2009-12-28 | 2011-08-16 | Young Optics Inc. | Zoom lens |
| US9851542B2 (en) * | 2016-04-08 | 2017-12-26 | Young Optics Inc. | Imaging lens |
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|---|---|---|---|---|
| CN201054064Y (en) * | 2007-04-20 | 2008-04-30 | 马力 | Analog DSLR capable of replacing and being compatible with lens |
| CN103969800A (en) * | 2014-03-26 | 2014-08-06 | 中国计量学院 | Long-focus type panoramic annular imaging lens |
| JP2020154286A (en) * | 2019-03-14 | 2020-09-24 | 株式会社リコー | Zoom lens system, interchangeable lens, and image capturing device |
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| CN115032776A (en) * | 2022-06-01 | 2022-09-09 | 广东北创光电科技股份有限公司 | Long-focal-length flange video lens |
| CN116009223A (en) * | 2022-12-29 | 2023-04-25 | 湖南长步道光学科技有限公司 | Large-aperture long-focus lens |
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