CN112363305B - Microminiature medium wave infrared continuous zooming optical system - Google Patents
Microminiature medium wave infrared continuous zooming optical system Download PDFInfo
- Publication number
- CN112363305B CN112363305B CN202011321779.9A CN202011321779A CN112363305B CN 112363305 B CN112363305 B CN 112363305B CN 202011321779 A CN202011321779 A CN 202011321779A CN 112363305 B CN112363305 B CN 112363305B
- Authority
- CN
- China
- Prior art keywords
- group
- lens
- zoom
- optical system
- rear group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 66
- 238000003384 imaging method Methods 0.000 claims abstract description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 12
- 239000010703 silicon Substances 0.000 claims description 12
- 229910052732 germanium Inorganic materials 0.000 claims description 6
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 6
- 238000013461 design Methods 0.000 abstract description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001931 thermography Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- 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
- G02B15/144—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 four groups only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/02—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of crystals, e.g. rock-salt, semi-conductors
-
- 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
- G02B15/15—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 compensation by means of only one movement or by means of only linearly related movements, e.g. optical compensation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1814—Diffraction gratings structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Lenses (AREA)
Abstract
The invention discloses a microminiature medium wave infrared continuous zooming optical system, which sequentially comprises a zooming objective lens group and a secondary imaging post-group from an object space to an image space along the optical axis direction; the zoom objective lens group comprises a front fixed group, a zoom group and a compensation group which share the optical axis; the zoom group and the compensation group axially move and zoom along the optical axis direction; the secondary imaging rear group comprises a first rear group lens, a second rear group lens and a third rear group lens which share an optical axis; when the zoom group is farthest from the compensation group, the optical system is in short focus; when the zoom group is nearest to the compensation group, the optical system is in long focus; the light beam from the object passes through the zoom objective lens group and is converged between the compensation group and the first rear group lens; the first, second and third rear group lenses ultimately image the image formed by the zoom objective on the detector target. The invention adopts a linear structure form, effectively reduces the length and width direction dimensions of the lens, and realizes the microminiature design of the lens.
Description
Technical Field
The invention relates to the field of optics, in particular to a microminiature medium wave infrared continuous zooming optical system.
Background
In recent years, infrared thermal imaging technology has been rapidly developed, and has many excellent characteristics, such as high concealment and no interference by enemy electrons, due to the fact that the infrared thermal imaging technology passively receives infrared radiation; the precision is high; the image is easy to observe, and the like, and is widely applied to the fields of military, vehicle-mounted, temperature measurement, electric line inspection, boundary security and the like, and particularly the military field. The infrared optical system is an important component of the thermal infrared imager by collecting the external infrared radiation capability and finally focusing the external infrared radiation capability on the target surface of the detector. Infrared optical systems can be broadly classified into fixed focus, two-stage, multi-stage, continuous zoom, and the like. The continuous zooming optical system can realize large-view-field searching and small-view-field tracking or identifying, can keep the observation target continuously enlarged or reduced in the zooming process, has great advantages in use, and therefore, the continuous zooming optical system has great application prospect in photoelectric observation equipment.
Through collecting and arranging related patents related to design and research of infrared continuous zooming optical systems in recent years, the structural types of the infrared continuous zooming optical systems are mainly divided into a U-shaped folding structure and a linear structure. The U-shaped folding structure deflects the light path 180 degrees by arranging two reflectors in the optical system, and the length direction size can be effectively compressed, but the total length of the optical system is not changed, so that the width direction size of the system is necessarily additionally increased, and the device integration miniaturization design is not facilitated; in addition, in the lens assembly and transfer function test stage, the assembly method of the reflector is complex and complicated, and indexes such as deflection angle, eccentricity, surface type precision and the like of the reflector have great influence on the transfer function test result of the lens. The presently disclosed infrared continuous zooming optical system with a linear structure has the advantages that on one hand, the length dimension of the lens is larger, the telephoto ratio is about 0.5-1, and on the other hand, the number of lenses used by the optical system is larger, and is about 7 and 12, so that the cost and the weight of the infrared lens are increased, the transmittance of the infrared lens is reduced, and the acting distance of the infrared lens is reduced.
Disclosure of Invention
Aiming at the defects of overlarge width size, complicated assembly, adjustment and test of the U-shaped folding structure infrared continuous zooming optical system in the prior art, the invention provides a microminiature medium wave infrared continuous zooming optical system which has the advantages of greatly simplified structure, shortened size, good system image quality and clear imaging.
The technical scheme adopted for solving the technical problems is as follows:
providing a microminiature medium wave infrared continuous zooming optical system, which sequentially comprises a zooming objective lens group and a secondary imaging post-group from an object side to an image side along the optical axis direction;
the zoom objective lens group comprises a front fixed group, a zoom group and a compensation group which share the optical axis; the zoom group and the compensation group axially move and zoom along the optical axis direction;
the secondary imaging rear group comprises a first rear group lens, a second rear group lens and a third rear group lens which share an optical axis;
when the zoom group is farthest from the compensation group, the optical system is in short focus; when the zoom group is nearest to the compensation group, the optical system is in long focus;
the light beam from the object passes through the zoom objective lens group and is converged between the compensation group and the first rear group lens; the first, second and third rear group lenses ultimately image the image formed by the zoom objective on the detector target.
By adopting the technical scheme, the F number of the optical system is 5.5, the wave band is 3.7-4.8 mu m, and the focal length is 14-140 mm.
The technical proposal is that the front fixed group, the variable magnification group, the compensation group, the first rear group lens, the second rear group lens and the third rear group lens are respectively 1 lens.
The technical proposal is that the focal power of the front fixed group, the variable-magnification group and the compensation group is distributed as a positive-negative-positive structure.
The front fixed group, the zoom group and the compensation group are respectively a silicon lens, a germanium lens and a silicon lens.
The technical proposal is connected, the front fixed group and the zoom group are aspheric lenses; the compensation group is an aspheric diffraction surface lens.
According to the technical scheme, the focal power of the first rear group lens, the second rear group lens and the third rear group lens is of a negative-positive structure.
According to the technical scheme, the first rear group lens, the second rear group lens and the third rear group lens are germanium lenses, silicon lenses and silicon lenses respectively.
According to the technical scheme, the first rear group lens and the third rear group lens are aspheric lenses; the second rear group lens is a spherical lens.
The invention has the beneficial effects that: the optical system of the invention adopts a linear structure, thereby effectively reducing the length and the width direction dimension of the lens, greatly simplifying the structure, ensuring the total length of the lens to be only 60.7mm and realizing the microminiature design of the lens. And the optical system adopts the combination movement of the three lenses of the rear group to realize high-low temperature focusing, compared with the conventional optical system, one lens can be reduced, the structure is simplified, and the energy transmittance of the optical system is improved.
Furthermore, the optical system adopts special surface types such as an aspheric surface, a diffraction surface and the like, the lens has good image quality and clear imaging, the number of lenses of the system is reduced, the optical transmittance is improved, and the target detection capability of the lens can be greatly improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic view of the optical path structure of a microminiature medium wave infrared continuous zooming optical system according to an embodiment of the present invention;
FIG. 2 is a schematic view of an optical system with a 14mm short focal length according to an embodiment of the present invention;
FIG. 3 is a schematic view of an optical system of a 140mm focal length according to an embodiment of the present invention;
FIG. 4 is a diagram of an imaging transfer function of a 14mm short focal length end according to an embodiment of the present invention;
FIG. 5 is a diagram of an imaging transfer function of a 140mm tele end according to an embodiment of the present invention;
in fig. 1: a-a zoom objective lens group, B-a post-secondary imaging group; 1-front fixed group, 2-variable power group, 3-compensation group, 4-first back group lens, 5-second back group lens, 6-third back group lens; 7-detector.
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, 2 and 3, the microminiature medium wave infrared continuous zooming optical system of the invention is provided with a zooming objective lens group A and a secondary imaging post group B in sequence from an object side to an image side along the optical axis direction; the zoom objective lens group A comprises a front fixed group 1, a zoom group 2 and a compensation group 3; the post-secondary imaging group includes a first post-group lens 4, a second post-group lens 5, and a third post-group lens 6. The zoom group 2 and the compensation group 3 can axially move along the optical axis direction for realizing zooming. When the variable magnification group 2 is furthest from the compensation group 3, the optical system is at a short focus. When the variable magnification group 2 is closest to the compensation group 3, the optical system is in tele. The rear group is a focusing group and has the functions of focusing in high and low temperature environments and focusing in close range imaging. Light from the object passes through the zoom objective lens group A and is converged between the compensation group 3 and the first rear group lens 4; the first, second and third rear group lenses 4, 5 and 6 finally image the image formed by the zoom objective group a onto the detector target, i.e. the focal plane of the detector 7.
The optical system of the invention has the F-number of 5.5, the wave band of 3.7-4.8 mu m, the focal length of 14-140 mm and the total length of the lens of 60.7mm. The front fixed group 1, the variable power group 2, the compensation group 3, the first rear group lens 4, the second rear group lens 5, and the third rear group lens 6 are each 1 lens, and there are 6 lenses in total. The optical system adopts the combination movement of the three lenses of the rear group to realize high-low temperature focusing, and compared with the conventional optical system, one lens can be reduced, the structure is simplified, and the energy transmittance of the optical system is improved.
The focal power of the front fixed group 1, the variable-magnification group 2 and the compensation group 3 is distributed into a positive-negative-positive structure. The lens materials of the front fixed group 1, the variable magnification group 2 and the compensation group 3 are silicon, germanium and silicon respectively. The front fixed group 1 and the variable magnification group 2 are aspheric lenses; the compensation group 3 is an aspherical diffraction surface lens for correcting aberrations. The optical powers of the first rear group lens 4, the second rear group lens 5, and the third rear group lens 6 are of a negative-positive configuration. The lens materials of the first rear group lens 4, the second rear group lens 5, and the third rear group lens 6 are germanium, silicon, and silicon, respectively. The first rear group lens 4 and the third rear group lens 6 are aspheric lenses, and the second rear group lens 5 is a spherical lens for improving the imaging quality of the system.
The aperture diaphragm of the microminiature medium wave infrared continuous zooming optical system is just positioned at the cold diaphragm of the detector, and can meet the 100% cold diaphragm efficiency, thereby avoiding the external stray light from being irradiated on the target surface of the detector, improving the imaging quality, and the image surface of the optical system is the target surface of the detector.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (6)
1. The microminiature medium wave infrared continuous zooming optical system is characterized by sequentially comprising a zooming objective lens group (A) and a secondary imaging post group (B) from an object side to an image side along the optical axis direction;
the zoom objective lens group (A) comprises a front fixed group (1), a variable magnification group (2) and a compensation group (3) which share the optical axis;
the secondary imaging rear group comprises a first rear group lens (4), a second rear group lens (5) and a third rear group lens (6) which share an optical axis;
the zoom group (2) and the compensation group (3) axially move and zoom along the optical axis direction; when the zoom group (2) is furthest away from the compensation group (3), the optical system is in short focus; when the zoom group (2) is nearest to the compensation group (3), the optical system is in long focus;
the light beam from the object passes through the zoom objective lens group (A) and is converged between the compensation group (3) and the first rear group lens (4); the first rear group lens (4), the second rear group lens (5) and the third rear group lens (6) are used for finally imaging the image formed by the zoom objective lens group (A) on the target surface of the detector;
the F number of the optical system is 5.5, the wave band is 3.7-4.8 mu m, and the focal length is 14-140 mm;
the focal power distribution of the front fixed group (1), the variable-magnification group (2) and the compensation group (3) is of a positive-negative-positive structure; the optical powers of the first rear group lens (4), the second rear group lens (5) and the third rear group lens (6) are negative-positive structures.
2. The miniature medium wave infrared continuous zoom optical system according to claim 1, wherein: the front fixed group (1), the variable magnification group (2), the compensation group (3), the first rear group lens (4), the second rear group lens (5) and the third rear group lens (6) are 1 lens respectively.
3. The miniature medium wave infrared continuous zoom optical system according to claim 1, wherein: the front fixed group (1), the variable magnification group (2) and the compensation group (3) are respectively a silicon lens, a germanium lens and a silicon lens.
4. The miniature medium wave infrared continuous zoom optical system according to claim 1, wherein: the front fixed group (1) and the variable magnification group (2) are aspheric lenses; the compensation group (3) is an aspherical diffraction surface lens.
5. The miniature medium wave infrared continuous zoom optical system according to claim 1, wherein: the first rear group lens (4), the second rear group lens (5) and the third rear group lens (6) are germanium lenses, silicon lenses and silicon lenses respectively.
6. The miniature medium wave infrared continuous zoom optical system according to claim 1, wherein: the first rear group lens (4) and the third rear group lens (6) are aspheric lenses; the second rear group lens (5) is a spherical lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011321779.9A CN112363305B (en) | 2020-11-23 | 2020-11-23 | Microminiature medium wave infrared continuous zooming optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011321779.9A CN112363305B (en) | 2020-11-23 | 2020-11-23 | Microminiature medium wave infrared continuous zooming optical system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112363305A CN112363305A (en) | 2021-02-12 |
| CN112363305B true CN112363305B (en) | 2024-03-15 |
Family
ID=74532985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011321779.9A Active CN112363305B (en) | 2020-11-23 | 2020-11-23 | Microminiature medium wave infrared continuous zooming optical system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112363305B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089514B (en) * | 2021-10-22 | 2024-02-09 | 浙江大立科技股份有限公司 | Refrigeration type medium wave infrared optical system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201352271Y (en) * | 2009-02-20 | 2009-11-25 | 山东神戎电子股份有限公司 | Infrared continuous zoom lens with big zoom ratio for non-refrigerated thermal imaging instrument |
| JP2014081444A (en) * | 2012-10-15 | 2014-05-08 | Nitto Kogaku Kk | Lens system and imaging apparatus |
| CN103823294A (en) * | 2014-02-24 | 2014-05-28 | 湖北久之洋红外系统股份有限公司 | Continuous zooming medium wave infrared optics system with super-long focal length |
| CN103852874A (en) * | 2014-03-14 | 2014-06-11 | 山东神戎电子股份有限公司 | Continuous zooming infrared lens with extra large zoom ratio |
| CN106054364A (en) * | 2016-08-23 | 2016-10-26 | 山东神戎电子股份有限公司 | High-transmittance medium-wave infrared zoom lens |
| CN213690097U (en) * | 2020-11-23 | 2021-07-13 | 湖北久之洋红外系统股份有限公司 | Microminiature medium wave infrared continuous zooming optical system |
-
2020
- 2020-11-23 CN CN202011321779.9A patent/CN112363305B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201352271Y (en) * | 2009-02-20 | 2009-11-25 | 山东神戎电子股份有限公司 | Infrared continuous zoom lens with big zoom ratio for non-refrigerated thermal imaging instrument |
| JP2014081444A (en) * | 2012-10-15 | 2014-05-08 | Nitto Kogaku Kk | Lens system and imaging apparatus |
| CN103823294A (en) * | 2014-02-24 | 2014-05-28 | 湖北久之洋红外系统股份有限公司 | Continuous zooming medium wave infrared optics system with super-long focal length |
| CN103852874A (en) * | 2014-03-14 | 2014-06-11 | 山东神戎电子股份有限公司 | Continuous zooming infrared lens with extra large zoom ratio |
| CN106054364A (en) * | 2016-08-23 | 2016-10-26 | 山东神戎电子股份有限公司 | High-transmittance medium-wave infrared zoom lens |
| CN213690097U (en) * | 2020-11-23 | 2021-07-13 | 湖北久之洋红外系统股份有限公司 | Microminiature medium wave infrared continuous zooming optical system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112363305A (en) | 2021-02-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111367063B (en) | Medium-wave infrared continuous zoom lens and imaging device | |
| CN109541788B (en) | Uncooled continuous zooming optical passive athermalization lens | |
| CN210090810U (en) | Economical medium-wave infrared refrigeration continuous zoom lens | |
| CN112305727A (en) | High-speed switching type dual-waveband dual-view-field optical system based on infrared dual-color detector | |
| CN213690097U (en) | Microminiature medium wave infrared continuous zooming optical system | |
| CN205539681U (en) | Become multiple proportions long wave infrared continuous -zoom lens greatly | |
| CN210090814U (en) | Long-focus medium-wave infrared refrigeration double-view-field lens | |
| CN112363305B (en) | Microminiature medium wave infrared continuous zooming optical system | |
| CN113805325A (en) | Long-focus large-view-field miniaturized active athermal optical system | |
| CN112305732A (en) | Ultra-long focal length high-resolution continuous zooming medium-wave infrared optical system | |
| CN112346228B (en) | Infrared continuous zooming optical system based on composite zooming super-large zoom ratio | |
| CN115032777B (en) | Double-working-band high-magnification wide-temperature continuous zooming optical lens and detector | |
| CN108008529B (en) | Turnover type medium-wave two-gear infrared optical system | |
| CN214252721U (en) | Ultra-long focal length medium wave infrared optical system | |
| CN114460728B (en) | Microminiature medium wave refrigerating infrared continuous zooming optical system | |
| CN112162392B (en) | Short wave infrared two-gear zoom optical lens | |
| CN216133244U (en) | High-zoom-ratio long-wave infrared continuous zoom lens | |
| CN214151216U (en) | Infrared continuous zooming optical system based on combined zooming and ultra-large zoom ratio | |
| CN113433677B (en) | Refrigeration type double-view-field infrared optical system with external entrance pupil | |
| CN112684598B (en) | Uncooled long-wave infrared continuous zooming optical system | |
| CN112612128B (en) | Medium-wave infrared refrigeration continuous zoom lens with large target surface and small F number and optical system | |
| CN211878294U (en) | Simple airborne long-wave double-view-field two-gear zooming infrared optical system | |
| CN111221115B (en) | Large-zoom-ratio short-wave infrared continuous zoom lens | |
| CN114488494A (en) | Refrigeration type medium-wave infrared two-gear zoom optical system | |
| CN111090170A (en) | 5-fold wavelength double-view-field two-gear zooming infrared optical system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |