CN115032776A - Long-focal-length flange video lens - Google Patents
Long-focal-length flange video lens Download PDFInfo
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- CN115032776A CN115032776A CN202210619441.4A CN202210619441A CN115032776A CN 115032776 A CN115032776 A CN 115032776A CN 202210619441 A CN202210619441 A CN 202210619441A CN 115032776 A CN115032776 A CN 115032776A
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- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 230000004075 alteration Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
- G02B15/1421—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being positive
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- Optics & Photonics (AREA)
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Abstract
The invention discloses a long-focal-length flange video lens which is characterized by comprising a first lens group, an iris diaphragm and a second lens group in sequence along the incident direction of light rays, wherein the first lens group and the second lens group both have positive focal power; the first lens group and the second lens group satisfy the following relationship: 0.45< f2/f1<0.55, f1 represents a focal length value of the first lens group, and f2 represents a focal length value of the second lens group. The large-aperture and high-resolution optical lens can achieve excellent effects of large aperture, high resolution, small distortion, long flange back focus, close-range focusing and chromatic aberration, meets the requirement of matching a camera module with a long flange back focus, and can be widely applied to the optical lens industry.
Description
Technical Field
The invention relates to the field of optical lenses, in particular to a long-focal-length flange video lens.
Background
With the development of society and science and technology, the demand of people for video shooting is increasing day by day, so that higher requirements are put forward for the product quality, the requirements and the like of a video lens, and important indexes of a long-focus video lens are large aperture, high resolution, small distortion and near-end shooting. The defects that the resolution ratio of a long-focus video lens is not high enough, the aperture is not large enough, the distortion is not small enough, near-end shooting cannot be met and the like generally exist in the current market, the high requirement of the market requirement of long-focus video shooting cannot be met, and particularly the long-focus video lens with the focal length of 100mm is adopted.
Disclosure of Invention
The present invention is directed to a telephoto-long-flange video lens, which solves one or more of the problems of the prior art and provides at least one of the advantages of the present invention.
The technical scheme adopted for solving the technical problems is as follows:
the invention provides a long-focal-length flange video lens which is characterized by sequentially comprising a first lens group, an iris diaphragm and a second lens group along a light incidence direction, wherein the first lens group and the second lens group both have positive focal power, the first lens group is a fixed group, and the second lens group is a focusing group capable of moving along an optical axis;
the first lens group and the second lens group satisfy the following relationship:
0.45<f2/f1<0.55；
where f1 represents the focal length value of the first lens group, and f2 represents the focal length value of the second lens group.
As a further improvement of the above technical solution, the first lens group includes five lenses arranged in sequence along the optical axis, and the second lens group includes eight lenses arranged in sequence along the optical axis.
As a further improvement of the above technical solution, at least one lens of the first lens group has a refractive index greater than 1.8 and less than 1.9.
As a further improvement of the above technical solution, the abbe number of at least one lens in the first lens group is greater than 90 and smaller than 100.
As a further improvement of the above technical solution, the first lens group includes at least two cemented lenses.
As a further improvement of the above technical solution, at least one lens of the second lens group has a refractive index greater than 1.4 and less than 1.5.
As a further improvement of the above technical solution, the abbe number of at least three lenses of the second lens group is greater than 20 and smaller than 30.
As a further improvement of the above technical solution, the second lens group includes at least two cemented lenses.
As a further improvement of the technical scheme, the optical total length of the lens is less than 149.7 mm and more than 150.7 mm.
The invention has the beneficial effects that: under the condition that the focal power of the first lens group and the second lens group meets the relation that 0.45< f2/f1<0.55, the camera module can realize large aperture and high resolution, small distortion and long flange back focus, has excellent near focusing and chromatic aberration effects, and meets the requirement of matching the long flange back focus.
Drawings
The invention is further described with reference to the accompanying drawings and examples;
FIG. 1 is a schematic diagram of an optical structure of an embodiment of a long-focal-length flange video lens according to the present invention;
FIG. 2 is a schematic diagram of longitudinal chromatic aberration of an embodiment of a telephoto-long-flange video lens provided by the present invention;
FIG. 3 is a schematic diagram of lateral chromatic aberration of an embodiment of a telephoto-long-flange video lens provided by the present invention;
FIG. 4 is a schematic view of field curvature and distortion of an embodiment of a tele-flange video lens provided in the present invention;
FIG. 5 is a schematic diagram of an MTF defocus curve of an embodiment of a long-focus flange video lens provided in the present invention;
FIG. 6 is a schematic MTF diagram of an embodiment of a long-focus flange video lens according to the present invention;
FIG. 7 is a schematic diagram of light aberration of an embodiment of a telephoto-long-flange video lens according to the present invention.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, preferred embodiments of which are illustrated in the accompanying drawings, wherein the drawings are provided for the purpose of visually supplementing the description in the specification and so forth, and which are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if words such as "a plurality" are described, the meaning is one or more, the meaning of a plurality is two or more, more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1-7, the tele-long-flange video shot of the present invention implements the following embodiments:
as shown in fig. 1, the telephoto-long-flange video lens of the present embodiment includes a first lens group G1, an iris 100, and a second lens group G2, and the first lens group G1, the iris 100, and the second lens group G2 are sequentially arranged in the light incidence direction.
The first lens group G1 is a fixed group, and the focal power is positive, the first lens group G1 includes five lenses, and the six lenses include a first lens body L1, a second lens body L2, a third lens body L3, a fourth lens body L4, and a fifth lens body L5, which are sequentially arranged along the optical axis.
The second lens group G2 is a focusing group, and has positive focal power, the second lens group G2 is movable along the optical axis, and the second lens group G2 includes a sixth lens body L6, a seventh lens body L7, an eighth lens body L8, a ninth lens body L9, a tenth lens body L10, an eleventh lens body L11, a twelfth lens body L12, and a thirteenth lens body L13, which are sequentially arranged along the optical axis.
All lenses of the lens of the embodiment are standard spherical lenses.
The first lens group G1 and the second lens group G2 need to satisfy the following relationship:
0.45<f2/f1<0.55；
f1 represents a focal length value of the first lens group G1, and f2 represents a focal length value of the second lens group G2.
After the definition of the relation 0.45< f2/f1<0.55, if the relation is not satisfied, the rear working distance of the optical system is too short, and the camera module which is matched with the rear focus of the long flange cannot be satisfied.
The definition of the first lens group G1 requires the following:
at least one of the first lens body L1, the second lens body L2, the third lens body L3, the fourth lens body L4 and the fifth lens body L5 has a refractive index of more than 1.8 and less than 1.9.
At least one of the first lens body L1, the second lens body L2, the third lens body L3, the fourth lens body L4 and the fifth lens body L5 has an Abbe number of more than 90 and less than 100.
Also, the first lens group G1 includes at least two cemented lenses, specifically: the first cemented lens is formed by cementing the first lens body L1 and the second lens body L2, and the second cemented lens is formed by cementing the third lens body L3 and the fourth lens body L4, so that the structure is compact, the resolution is improved, and the sensitivity of the tolerance of the assembly process is reduced.
The requirements for the definition of the second lens group G2 are as follows:
at least one of the sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, and thirteenth lens bodies L6, L7, L8, L9, L10, L11, L12, and L13 has a refractive index greater than 1.4 and smaller than 1.5.
At least three of the sixth lens body L6, the seventh lens body L7, the eighth lens body L8, the ninth lens body L9, the tenth lens body L10, the eleventh lens body L11, the twelfth lens body L12 and the thirteenth lens body L13 have abbe numbers greater than 20 and smaller than 30.
Also, the second lens group G2 of the present embodiment includes at least two cemented lenses, specifically: the first cemented lens is formed by cementing the sixth lens body L6 and the seventh lens body L7, and the second cemented lens is formed by cementing the ninth lens body L9 and the tenth lens body L10, so that the structure is compact, the resolution is improved, and the sensitivity of the tolerance of the assembly process is reduced.
Four groups of cemented lenses are arranged in the embodiment, so that chromatic aberration is optimized, and a good chromatic aberration real shooting effect is achieved.
The last lens of the embodiment adopts a meniscus lens, wherein the concave surface faces towards the chip, so that the whole lens is enhanced to greatly assist in external anti-interference contact, and damage to the lens caused by careless touch in the use process is prevented.
In addition, the total length between the front end mirror surface of the first lens body L1 and the rear end mirror surface of the thirteenth lens body L13 of the present embodiment, i.e., the total optical lens length, is less than 145.5 mm and greater than 144.5 mm.
The specific parameters of the tele-length flange video lens in this embodiment are as follows:
where Surf denotes the corresponding surface number in the optical system, Type denotes the Type of the surface, Radius denotes the Radius of curvature, Thickness denotes the Thickness, Index denotes the refractive Index, and ABB denotes the ABB number.
According to fig. 2 to 7, it can be determined that the optical system of the present invention has good aberration correction, and is optimized to satisfy high resolution, small distortion, and a camera module that satisfies matching with a longer flange back focus.
According to the embodiment, the invention realizes the long focal length of 100mm, large aperture, small distortion, high resolution, long flange back focus and good chromatic aberration effect.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (9)
1. A long-focal-length flange video lens is characterized by comprising a first lens group (G1), an iris diaphragm (100) and a second lens group (G2) in sequence along the incident direction of light rays, wherein the first lens group (G1) and the second lens group (G2) both have positive focal power, the first lens group (G1) is a fixed group, and the second lens group (G2) is a focusing group capable of moving along an optical axis;
the first lens group (G1) and the second lens group (G2) satisfy the following relationship:
0.45<f2/f1<0.55；
where f1 represents a focal length value of the first lens group (G1), and f2 represents a focal length value of the second lens group (G2).
2. A tele-long flange video shot as recited in claim 1, wherein:
the first lens group (G1) comprises five lenses which are sequentially arranged along an optical axis, and the second lens group (G2) comprises eight lenses which are sequentially arranged along the optical axis.
3. A tele-long flange video shot as recited in claim 2, wherein:
at least one lens in the first lens group (G1) has a refractive index of more than 1.8 and less than 1.9.
4. A tele-long flange video shot as recited in claim 2, wherein:
the abbe number of at least one lens in the first lens group (G1) is more than 90 and less than 100.
5. A tele-long flange video shot as recited in claim 2, wherein:
the first lens group (G1) includes at least two cemented lenses.
6. A tele-long flange video shot as recited in claim 2, wherein:
the refractive index of at least one lens in the second lens group (G2) is more than 1.4 and less than 1.5.
7. A tele-long flange video shot as recited in claim 2, wherein:
the abbe number of at least three lenses of the second lens group (G2) is more than 20 and less than 30.
8. A tele-long flange video shot as recited in claim 2, wherein:
the second lens group (G2) includes at least two cemented lenses.
9. A tele-long flange video shot as recited in claim 2, wherein:
the total optical length of the lens is less than 149.7 millimeters and more than 150.7 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210619441.4A CN115032776B (en) | 2022-06-01 | 2022-06-01 | Long Jiao Changfa blue video lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210619441.4A CN115032776B (en) | 2022-06-01 | 2022-06-01 | Long Jiao Changfa blue video lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115032776A true CN115032776A (en) | 2022-09-09 |
| CN115032776B CN115032776B (en) | 2024-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210619441.4A Active CN115032776B (en) | 2022-06-01 | 2022-06-01 | Long Jiao Changfa blue video lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116582738A (en) * | 2023-07-13 | 2023-08-11 | 珠海市川富光学技术有限公司 | Long-focus large-aperture short-flange video lens with focal length of 85mm |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000330020A (en) * | 1999-05-20 | 2000-11-30 | Asahi Optical Co Ltd | Endoscope objective variable power optical system |
| JP2008151949A (en) * | 2006-12-15 | 2008-07-03 | Nikon Corp | Wide angle lens, imaging apparatus, and focusing method of the wide angle lens |
| JP2016136211A (en) * | 2015-01-23 | 2016-07-28 | 株式会社ニコン | Optical system, imaging device having the same, and manufacturing method of optical system |
| CN111694135A (en) * | 2020-07-15 | 2020-09-22 | 北创光电科技(邵阳)有限公司 | Big wide angle video camera lens of focus 8mm |
| CN112327469A (en) * | 2020-09-21 | 2021-02-05 | 舜宇光学(中山)有限公司 | Imaging lens |
-
2022
- 2022-06-01 CN CN202210619441.4A patent/CN115032776B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000330020A (en) * | 1999-05-20 | 2000-11-30 | Asahi Optical Co Ltd | Endoscope objective variable power optical system |
| JP2008151949A (en) * | 2006-12-15 | 2008-07-03 | Nikon Corp | Wide angle lens, imaging apparatus, and focusing method of the wide angle lens |
| JP2016136211A (en) * | 2015-01-23 | 2016-07-28 | 株式会社ニコン | Optical system, imaging device having the same, and manufacturing method of optical system |
| CN111694135A (en) * | 2020-07-15 | 2020-09-22 | 北创光电科技(邵阳)有限公司 | Big wide angle video camera lens of focus 8mm |
| CN112327469A (en) * | 2020-09-21 | 2021-02-05 | 舜宇光学(中山)有限公司 | Imaging lens |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116582738A (en) * | 2023-07-13 | 2023-08-11 | 珠海市川富光学技术有限公司 | Long-focus large-aperture short-flange video lens with focal length of 85mm |
| CN116582738B (en) * | 2023-07-13 | 2023-10-27 | 珠海市川富光学技术有限公司 | Long-focus large-aperture short-flange video lens with focal length of 85mm |
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| CN115032776B (en) | 2024-03-12 |
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