CN107272174B - Catadioptric optical lens - Google Patents
Catadioptric optical lens Download PDFInfo
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- CN107272174B CN107272174B CN201710471371.1A CN201710471371A CN107272174B CN 107272174 B CN107272174 B CN 107272174B CN 201710471371 A CN201710471371 A CN 201710471371A CN 107272174 B CN107272174 B CN 107272174B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
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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
- G02B13/04—Reversed telephoto objectives
Abstract
The invention provides a catadioptric optical lens which is smaller in size, lighter in weight and more suitable for a light and small-sized photoelectric system. The refraction and reflection type optical lens comprises an afocal component, a secondary mirror component, a first gluing component, a second gluing component, a main reflecting mirror and a third lens which are sequentially arranged on an optical axis from left to right in space; the afocal assembly is used for compensating spherical aberration, sinusoidal aberration and position chromatic aberration of other lenses in the system; the secondary mirror assembly is integrally positioned at a central through hole reserved by a second lens in the afocal assembly and is used for compensating spherical aberration and sine difference of the main mirror; the first gluing piece and the second gluing piece are integrally used for compensating spherical aberration and sine difference of the main reflecting mirror and the secondary mirror assembly; the third lens is positioned at a central through hole reserved by the main reflector and is arranged close to the right end and used for compensating residual spherical aberration, sinusoidal aberration and position chromatic aberration of the system.
Description
Technical Field
The invention relates to a catadioptric optical lens.
Background
For the requirement of small visual field, large relative aperture and long focal length, a catadioptric structure is generally adopted, and the catadioptric structure is characterized in that the telephoto ratio (the ratio of the mechanical tube length to the focal length) is small, and is usually about 0.5. The advantage of this form of construction is that it is small and lightweight. With the development of the optoelectronic system, the advantage of the lens with the telephoto ratio of 0.5 in terms of volume and weight is not obvious, which affects the application of the lens in the light and small optoelectronic system.
Disclosure of Invention
The purpose of the invention is: on the premise of ensuring the imaging quality, the catadioptric optical lens with the telephoto ratio less than 0.4 is provided, has smaller volume and lighter weight, and is more suitable for light and small-sized photoelectric systems.
In order to achieve the above object, the present invention provides the following solutions:
the refraction and reflection type optical lens is provided with light rays which are incident from left to right and comprises an afocal component, a secondary mirror component, a first cemented part, a second cemented part, a main reflecting mirror and a third lens which are sequentially arranged on an optical axis from left to right in space;
the light propagation path is: the light rays penetrate through the afocal component to the main reflecting mirror, are reflected to the secondary mirror component through the main reflecting mirror, enter the secondary mirror component, approach the optical axis and are reflected again, and then reach the image surface after sequentially penetrating through the first gluing component, the second gluing component and the third lens;
the afocal assembly consists of two lenses which are sequentially arranged, wherein the focal length of the first lens is positive, and the focal length of the second lens is negative, and the afocal assembly is used for compensating the spherical aberration, the sinusoidal aberration and the position chromatic aberration of the rest lenses (namely all lenses except the afocal assembly) in the system;
the secondary mirror assembly is integrally positioned at a central through hole reserved by a second lens in the afocal assembly and is used for compensating spherical aberration and sine difference of the main mirror;
the main reflector is a concave reflector, and the working surface is plated with an outer reflecting film;
the first gluing piece and the second gluing piece are integrally used for compensating spherical aberration and sine difference of the main reflecting mirror and the secondary mirror component; the third lens is positioned at a central through hole reserved by the main reflector and is arranged close to the right end and used for compensating residual spherical aberration, sinusoidal aberration and position chromatic aberration of the system;
the focal length of the catadioptric optical lens is recorded as f, and the focal length of the afocal component is recorded as f A Focal length of the main mirror is f B Focal length of secondary mirror assembly is f C The focal length of the first adhesive member is f D The focal length of the second adhesive member is f E The focal length of the third lens is f F Then, there are: l f A |＞10000；
Based on the above scheme, the invention further optimizes as follows:
the secondary lens assembly is formed by gluing three lenses which are sequentially arranged by photosensitive adhesives, wherein the focal length of the first lens is negative, the focal length of the second lens is positive, the focal length of the third lens is negative, an internal reflection film is plated on the working surface of the first lens exposed in the air, and the direction of working light is reversed from the surface.
The first gluing piece is formed by gluing two lenses which are sequentially arranged by using photosensitive glue, wherein the focal length of the first lens is positive, and the focal length of the second lens is negative; the second adhesive part is formed by bonding two lenses which are sequentially arranged by photosensitive adhesive, wherein the focal length of the first lens is positive, and the focal length of the second lens is negative; the third lens focal length is positive.
Recording three lenses of the secondary lens component as C-1, C-2 and C-3 in sequence, wherein two lenses of the first cemented part D are D-1 and D-2, and two lenses of the second cemented part are E-1 and E-2, and focal lengths of the configured lenses have the following relations respectively:
the operating waveband range of the catadioptric optical lens is required to be 0.4um-1.2um, and then the reflecting waveband range of the outer reflecting film of the main reflecting mirror is 0.4um-1.2um; the reflection wave band range of the internal reflection film of the secondary mirror assembly is 0.4um-1.2um; the non-cemented working surfaces of other lenses are uniformly coated with an antireflection film, and the antireflection wave band ranges from 0.4um to 1.2um.
The working surfaces of all lenses are spherical.
The substrate material used by the main reflecting mirror is colorless optical glass, copper, aluminum or SIC, and the rest lens materials are all colorless optical glass.
The invention has the following beneficial effects:
the interval between the afocal component A and the main reflector B is effectively controlled, and the purpose of reducing the telephoto ratio is achieved; the adhesive element D, the adhesive element E and the lens F effectively compensate residual aberration of the afocal component A, the primary mirror B and the secondary mirror component C, so that the image quality of the catadioptric optical lens meets the use requirement.
Drawings
FIG. 1 is a schematic view of an optical system of the present invention.
FIG. 2 is the MTF graph (MTF @ 145lp/mm) of the optical system of the present invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
As shown in fig. 1, the catadioptric optical lens mainly includes an afocal element a, a secondary mirror element C, a first adhesive element D, a second adhesive element E, a primary mirror B, and a third lens F, which are spatially arranged in sequence from left to right on an optical axis; and the image surface G position is provided with a photosensitive surface of an imaging detector. Wherein:
the reflecting surface of the main reflector B is a concave surface, and has no chromatic aberration, but generates a large amount of spherical aberration and sinusoidal aberration. The function of the system is to reverse the direction of the working light and reduce the telephoto ratio of the system.
The afocal component A consists of colorless optical glass lenses A-1 and A-2, wherein the focal length of the colorless optical glass lens A-1 is positive, and the focal length of the colorless optical glass lens A-2 is negative, and has the function of compensating the spherical aberration, the sinusoidal aberration and the position chromatic aberration of the rest lenses of the system.
The secondary mirror component C consists of colorless optical glass lenses C-1, C-2 and C-3, the focal length of the colorless optical glass lens C-1 is negative, the focal length of the colorless optical glass lens C-2 is positive, and the focal length of the colorless optical glass lens C-3 is negative, wherein the working surface of the colorless optical glass lens C-1 exposed in the air is plated with a reflecting film, and the direction of working light is reversed from the surface. The secondary mirror assembly C itself is achromatic and compensates for spherical and sinusoidal aberrations of the primary mirror B.
The first adhesive piece D consists of colorless optical glass lenses D-1 and D-2, wherein the focal length of the colorless optical glass lens D-1 is positive, and the focal length of the colorless optical glass lens D-2 is negative. The first adhesive piece D itself is achromatic, and is mainly used for compensating the spherical aberration and the sine aberration of the main reflecting mirror B and the secondary mirror assembly C.
The second adhesive member E consists of colorless optical glass lenses E-1 and E-2, wherein the focal length of the colorless optical glass lens E-1 is positive, and the focal length of the colorless optical glass lens E-2 is negative. The second adhesive member E itself is achromatic and mainly compensates for spherical aberration and sinusoidal aberration of the primary mirror B and the secondary mirror assembly C.
The third lens F is an optically colorless glass lens having a positive focal length. The function of the system is to compensate the residual spherical aberration, sinusoidal aberration and position chromatic aberration of the system.
F number range of catadioptric optical lens: 5-10; telephoto ratio range of catadioptric optical lens: 0.15-0.3. if the focal length of the catadioptric optical lens is f, the following steps are performed: l f A |＞10000；
The specific focal lengths of the lenses are respectively related as follows:
optical indices of the examples:
The optical lens parameters of the embodiment are as follows:
from fig. 2, it can be seen that the optical transfer curve of each field of view of the embodiment approaches the theoretical optical transfer function position, and the mtf @145lpmm is close to 0.3, which completely meets the actual use requirement.
Claims (5)
1. The utility model provides a catadioptric optical lens, establishes light and from left to right incides which characterized in that:
the optical lens consists of an afocal component, a secondary mirror component, a first gluing component, a second gluing component, a main reflecting mirror and a third lens which are sequentially arranged on an optical axis from left to right in space;
the light propagation path is: the light rays penetrate through the afocal component to the main reflecting mirror, are reflected to the secondary mirror component through the main reflecting mirror, enter the secondary mirror component, approach the optical axis and are reflected again, and then reach the image surface after sequentially penetrating through the first gluing component, the second gluing component and the third lens;
the afocal component consists of two lenses which are arranged in sequence, wherein the focal length of the first lens is positive, and the focal length of the second lens is negative, and the afocal component is used for compensating spherical aberration, sinusoidal aberration and position chromatic aberration of other lenses in the system;
the secondary mirror assembly is integrally positioned at a central through hole reserved by a second lens in the afocal assembly and is used for compensating spherical aberration and sine difference of the main mirror;
the secondary mirror assembly is formed by gluing three lenses which are sequentially arranged by photosensitive adhesives, wherein the three lenses of the secondary mirror assembly are sequentially C-1, C-2 and C-3, the focal length of the first lens C-1 is negative, the focal length of the second lens C-2 is positive, the focal length of the third lens C-3 is negative, an internal reflection film is plated on the working surface of the first lens C-1 exposed in the air, and the direction of working light is opposite through the surface;
the main reflector is a concave reflector, and the working surface is plated with an outer reflecting film;
the first gluing piece and the second gluing piece are integrally used for compensating spherical aberration and sine difference of the main reflecting mirror and the secondary mirror assembly; the third lens is positioned at a central through hole reserved by the main reflector and is arranged close to the right end and used for compensating residual spherical aberration, sinusoidal aberration and position chromatic aberration of the system;
the first gluing piece is formed by gluing two sequentially arranged lenses by using photosensitive glue, the two lenses of the first gluing piece are sequentially marked as D-1 and D-2, wherein the focal length of the D-1 lens of the first lens is positive, and the focal length of the D-2 lens of the second lens is negative; the second adhesive part is formed by bonding two lenses which are sequentially arranged by photosensitive adhesive, and the two lenses of the second adhesive part are sequentially E-1 and E-2, wherein the focal length of the first lens E-1 is positive, and the focal length of the second lens E-2 is negative; the third lens focal length is positive;
the focal length of the catadioptric optical lens is recorded as f, and the focal length of the afocal component is recorded as f A Focal length of the main mirror is f B Focal length of secondary mirror assembly is f C The focal length of the first adhesive member is f D The focal length of the second adhesive member is f E The focal length of the third lens is f F Then, there are: l f A |>10000；
2. The catadioptric optical lens of claim 1, wherein: the focal lengths of the three lenses C-1, C-2 and C-3 of the secondary mirror assembly, the two lenses D-1 and D-2 of the first adhesive part and the two lenses E-1 and E-2 of the second adhesive part are respectively in the following relationship:
3. the catadioptric optical lens of claim 2, wherein: the operating waveband range of the catadioptric optical lens is required to be 0.4um-1.2um, and then the reflecting waveband range of the outer reflecting film of the main reflecting mirror is 0.4um-1.2um; the reflection waveband range of the internal reflection film of the secondary mirror assembly is 0.4um-1.2um; the non-cemented working surfaces of other lenses are uniformly coated with an antireflection film, and the antireflection wave band ranges from 0.4um to 1.2um.
4. The catadioptric optical lens of claim 1, wherein: the working surfaces of all lenses are spherical.
5. The catadioptric optical lens of claim 1, wherein: the substrate material used by the main reflecting mirror is colorless optical glass, copper, aluminum or SIC, and the rest lens materials are all colorless optical glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710471371.1A CN107272174B (en) | 2017-06-20 | 2017-06-20 | Catadioptric optical lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710471371.1A CN107272174B (en) | 2017-06-20 | 2017-06-20 | Catadioptric optical lens |
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| CN107272174A CN107272174A (en) | 2017-10-20 |
| CN107272174B true CN107272174B (en) | 2023-04-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108333719B (en) * | 2018-03-09 | 2022-12-27 | 中国科学院西安光学精密机械研究所 | Visible 530mm focal length lens |
| CN113325571B (en) * | 2021-05-26 | 2024-01-30 | 长春理工大学 | Compact type target detection optical system with large relative aperture length Jiao Gaoqing |
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| FR2913778B1 (en) * | 2007-03-16 | 2009-05-08 | Thales Sa | AFOCAL CATADIOPTRIC DEVICE WITH REDUCED DIMENSIONS |
| JP2013015712A (en) * | 2011-07-05 | 2013-01-24 | Sony Corp | Catadioptric lens system and imaging apparatus |
| CN104035188A (en) * | 2014-06-10 | 2014-09-10 | 西南技术物理研究所 | Low-cost refracting-reflecting athermalizing medium wave infrared lens |
| CN206833060U (en) * | 2017-06-20 | 2018-01-02 | 西安泰豪红外科技有限公司 | A kind of catadioptric optical camera lens |
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Address after: 710077 8th floor, block a, no.1309, Shanglinyuan 4th Road, high tech Zone, Xi'an City, Shaanxi Province Applicant after: Xi'an zhongkelide Infrared Technology Co.,Ltd. Address before: 710119 201, block a, No.32, development avenue, new industrial park, high tech Zone, Xi'an City, Shaanxi Province Applicant before: XI'AN TELLHOW INFRARED TECHNOLOGY Co.,Ltd. |
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