CN109116530B - Short-wave infrared optical athermalization continuous zoom lens - Google Patents

Short-wave infrared optical athermalization continuous zoom lens Download PDF

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Publication number
CN109116530B
CN109116530B CN201810943194.7A CN201810943194A CN109116530B CN 109116530 B CN109116530 B CN 109116530B CN 201810943194 A CN201810943194 A CN 201810943194A CN 109116530 B CN109116530 B CN 109116530B
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lens
equal
zoom
satisfies
less
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CN109116530A (en
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屈立辉
周宝藏
石姣姣
肖维军
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Fujian Forecam Optics Co Ltd
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Fujian Forecam Optics Co Ltd
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B15/00Optical objectives with means for varying the magnification
    • G02B15/14Optical 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
    • G02B15/16Optical 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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/163Optical 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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
    • G02B15/167Optical 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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
    • G02B15/173Optical 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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+

Abstract

The invention relates to a short-wave infrared optical athermalized continuous zoom lens, wherein an optical system of the lens comprises a front fixed group A with positive focal power, a zoom group B with negative focal power, a compensation group C with positive focal power, a diaphragm D and a rear fixed group E with positive focal power, wherein the front fixed group A comprises a first adhesive group formed by tightly connecting a positive meniscus lens A-1, a negative meniscus lens A-2 and a positive meniscus lens A-3; the zoom group B comprises a second adhesive combination formed by tightly connecting a biconcave lens B-1, a positive meniscus lens B-2 and a biconcave lens B-3; the compensation group C comprises a third adhesive group formed by tightly connecting a biconvex lens C-1, a negative meniscus lens C-2 and a positive meniscus lens C-3; the rear fixed group E comprises a positive meniscus lens E-1, a negative meniscus lens E-2 and a double convex lens E-3. The lens realizes the fastest zooming, so that the lead is small, the optical total length is short, the system size is small, the working temperature range is wide, and frequent repeated focusing is not needed.

Description

Short-wave infrared optical athermalization continuous zoom lens
Technical Field
The invention relates to a short-wave infrared optical athermalized continuous zoom lens.
Background
Compared with visible light, the short-wave infrared has more excellent fog penetration capability, and can greatly improve the visibility in a fire smoke environment; the infrared sensor is sensitive to high-temperature objects, and can determine the ignition point more accurately than long-wave infrared; the short wave infrared is sensitive to moisture and can be used for rainstorm early warning, detection, tornado observation and the like. Under the condition of bad weather and low visibility, the imaging is similar to a visible light image, and has better detail resolution and analysis capability than thermal imaging. The difference between the reflection spectrum of the near-infrared band to green plants and the camouflage paint is very large, and the conventional camouflage has no any significance to a near-infrared imaging system and can be used as a new safety defense means for discovering camouflage. Therefore, the development of the short-wave infrared lens is very necessary. However, the development and application time of the existing short-wave infrared lens is short, the defect of low resolution is generally existed, most of the short-wave infrared lenses can only meet the use requirement of a short-wave infrared detector with the pixel size of 15um, and the short-wave infrared lens is basically a fixed-focus lens and is difficult to meet the requirements of panoramic search and small-area amplification observation at the same time, so that the development of the continuous zooming short-wave infrared lens is very necessary. Meanwhile, in order to enable the lens to adapt to different temperature environments, frequent repeated focusing is not needed, the structure is simplified, and optical passive athermalization is needed to be realized.
Disclosure of Invention
In view of the above, the present invention provides a short-wave infrared optical athermalized zoom lens with compact structure and small volume, and has a wide operating temperature range.
The invention is realized by adopting the following scheme: an optical system of the lens comprises a front fixed group A with positive focal power, a zoom group B with negative focal power, a compensation group C with positive focal power, a diaphragm D and a rear fixed group E with positive focal power which are sequentially arranged along the incident direction of light rays from front to back, wherein the front fixed group A comprises a first adhesive combination of a positive meniscus lens A-1, a negative meniscus lens A-2 and a positive meniscus lens A-3 in tight joint; the zoom group B comprises a second adhesive combination formed by tightly connecting a biconcave lens B-1, a positive meniscus lens B-2 and a biconcave lens B-3; the compensation group C comprises a third adhesive group formed by tightly connecting a biconvex lens C-1, a negative meniscus lens C-2 and a positive meniscus lens C-3; the rear fixed group E comprises a positive meniscus lens E-1, a negative meniscus lens E-2 and a double convex lens E-3.
Further, the air space between the front fixed group A and the variable-power group B is 4.16-22.87 mm, the air space between the variable-power group B and the compensation group C is 2.78-34.16 mm, the air space between the compensation group C and the rear fixed group E is 2.03-32 mm, and the positive meniscus lens A-3 is made of an ultra-low dispersion N-PK52A material.
Further, the air space between the positive meniscus lens a-1 and the first glue group is 0.74mm, the air space between the biconcave lens B-1 and the second glue group is 1.21mm, the air space between the biconvex lens C-1 and the third glue group is 0.1mm, the air space between the positive meniscus lens E-1 and the negative meniscus lens E-2 is 0.66mm, and the air space between the negative meniscus lens E-2 and the biconvex lens E-3 is 14.78 mm.
Further, the radius of curvature R1 of the front mirror surface of the positive meniscus lens a-1 satisfies the relation: r1 is more than or equal to 42.3mm and less than or equal to 44.987mm, and the curvature radius R2 of the rear mirror surface satisfies the relation: r2 is more than or equal to 198mm and less than or equal to 203.471mm, and the thickness is 5.18 mm; the curvature radius R3 of the first combined front mirror surface satisfies the relation: r3 is more than or equal to 113.01mm and less than or equal to 115.214mm, and the curvature radius R4 of the gluing surface satisfies the relation: r4 is more than or equal to 23.8mm and less than or equal to 24.021mm, and the curvature radius R5 of the rear mirror surface satisfies the relation: r5 is more than or equal to 485mm and less than or equal to 512.2mm, the thickness of the negative meniscus lens A-2 is 1.95mm, and the thickness of the positive meniscus lens A-3 is 8.83 mm; the curvature radius R6 of the front mirror surface of the biconcave lens B-1 satisfies the relation: r6 is more than or equal to-79.45 mm and less than or equal to-77.232 mm, the curvature radius R7 of the rear mirror surface satisfies the relation of 69.1mm more than or equal to R7 more than or equal to 70.232mm, and the thickness is 1.1 mm; the curvature radius R8 of the second combined front mirror surface satisfies the relation: -73.213mm or less, R8 mm or less, and-71.25 mm, and the curvature radius R9 of the glued surface satisfies the relation: -16.85mm ≦ R9 ≦ -16.452mm, the radius of curvature of the rear mirror R10 satisfying the relationship: r is more than or equal to 82mm and less than or equal to 84.813mm, the thickness of the positive meniscus lens B-2 is 3.59mm, and the thickness of the double concave lens B-3 is 1.1 mm; the curvature radius R11 of the front mirror surface of the biconvex lens C-1 satisfies the relation: r11 is more than or equal to 47.5mm and less than or equal to 48.312mm, and the curvature radius R12 of the rear mirror surface satisfies the relation: r12 is more than or equal to 135.2mm and less than or equal to 132.2mm, and the thickness is 2.08 mm; the radius of curvature R13 of the third cemented front mirror surface satisfies the relation: r is more than or equal to 52mm and less than or equal to 60.23mm, and the curvature radius R14 of the gluing surface satisfies the relation: r14 is more than or equal to 10.89mm and less than or equal to 11.05mm, and the curvature radius R15 of the rear mirror surface satisfies the relation: r15 is more than or equal to 420mm and less than or equal to 99999999mm, the thickness of the negative meniscus lens C-2 is 0.95mm, and the thickness of the positive meniscus lens C-3 is 3.89 mm; the radius of curvature R16 of the front mirror surface of the positive meniscus lens E-1 satisfies the relation: r16 is more than or equal to 10.5mm and less than or equal to 13.989mm, and the curvature radius R17 of the rear mirror surface satisfies the relation: r17 is more than or equal to 20.45mm and less than or equal to 27.89mm, and the thickness is 1.88 mm; the radius of curvature R18 of the front mirror surface of the negative meniscus lens E-2 satisfies the relationship: r18 is more than or equal to 30.1mm and less than or equal to 36.79mm, and the curvature radius R19 of the rear mirror surface satisfies the relation: r19 is more than or equal to 8.2mm and less than or equal to 9.35mm, and the thickness is 2.66 mm; the curvature radius R20 of the front mirror surface of the biconvex lens E-3 satisfies the relation: RR20 is more than or equal to 27mm and less than or equal to 28.3mm, and the curvature radius R21 of the rear mirror surface satisfies the relation: r20 is more than or equal to 240.1mm and less than or equal to 210.01mm, and the thickness is 2.07 mm.
Furthermore, the mechanical structure of camera lens is including installing the zoom compensation zoom mechanism of zoom group B and compensation group C, zoom compensation zoom mechanism includes the main lens cone, the interior front end of main lens cone is equipped with the zoom subassembly of installing zoom group B, the interior rear end of main lens cone is equipped with the compensation subassembly of installing compensation group C, and the main lens cone front end is equipped with preceding fixed subassembly, and preceding fixed subassembly is equipped with the back fixed subassembly including the preceding group lens cone of installing preceding fixed group A, and the main lens cone rear end is equipped with the back fixed subassembly, and the back fixed subassembly is including the back group lens cone of installing back fixed group D.
Furthermore, the front end of the front group lens barrel is in threaded connection with a pressing ring for pressing the biconvex lens A-1, and an AB space ring is arranged between the biconvex lens A-1 and the first glue combination; the zoom assembly comprises a zoom lens base provided with a zoom group B, the zoom assembly is arranged on a zoom moving base and comprises a compensation lens base provided with a compensation group C, the compensation assembly is arranged on the compensation moving base and is connected with the zoom moving base through threads, the compensation assembly is connected with the compensation moving base through threads, a zoom cam is sleeved in the main lens barrel, and a zoom motor in meshing transmission with the zoom cam through a motor gear is arranged outside the main lens barrel.
Compared with the prior art, the invention has the following beneficial effects: (1) by adopting the positive group compensation structure, the focal power of the front group is smaller, the secondary spectral aberration is reduced, and an ultra-low dispersion material is used, so that the resolution level of a long focal length is greatly improved, and the use requirement of a short-wave infrared camera with the pixel size of 7um can be met; (2) continuous zooming, and simultaneously meeting the requirements of large-area panoramic search and small-area enlarged observation; (3) the optical passive athermalization design is realized, and temperature focusing is not needed under a wide temperature dynamic range, so that the structure is simple, and the product failure rate is reduced.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a general assembly view of the structure of the embodiment of the present invention;
FIG. 3 is a schematic view of a front mounting assembly in accordance with an embodiment of the present invention;
FIG. 4 is an end view of the zoom lens module according to the embodiment of the present invention;
FIG. 5 is a cross-sectional view of a zoom lens module according to an embodiment of the present invention;
FIG. 6 is a schematic view of a rear mounting assembly in an embodiment of the present invention;
FIG. 7 is a graph of the MTF in the tele state of an embodiment of the invention;
FIG. 8 is a graph of MTF at-40 ℃ for the long focus of an embodiment of the invention;
the reference numbers in the figures illustrate:
41-front fixing component; 42-a zoom component; 43-a cam assembly; 44-a compensation component; 45-rear fixed component; 46-a detector assembly;
51-meniscus lens a-1; 52-pressing ring; 53-space ring; 54-a first glue set; 55-front group lens barrel;
61-zoom group B; 62-cam cover plate; 63-a zooming movable seat; 64-a main barrel; 65-a guide bar; 66-a zoom cam; 67-compensation moving seat; 68-Compensation group C; 69-a microswitch rack; 710-a microswitch; 611-variable magnification potentiometer; 612-zoom potentiometer rack; 613-potentiometer gear; 614-a limiting block; 615-zooming motor rack; 616-motor gear; 617-zoom motor; 618-a microswitch; 619-micro switch frame;
71-rear group gasket; 72-rear group lens barrel; 73-rear bearing seat; 74-rear bearing retainer; 75-rear bearing ring; 76-detector adjustment shim; 77-rear group pressing ring; 78-lenticular lens E-3; 79-rolling bearings; 710-rear group space ring; 711-negative meniscus lens E-2; 712-rear group space ring; 713-positive meniscus lens E-1.
Detailed Description
As shown in fig. 1 to 8, an optical system of a short wave infrared optical athermalized continuous zoom lens comprises a front fixed group a with positive focal power, a zoom group B with negative focal power, a compensation group C with positive focal power, a diaphragm D and a rear fixed group E with positive focal power, which are sequentially arranged along the incident direction of light rays from front to rear, wherein the front fixed group a comprises a first adhesive group formed by tightly connecting a positive meniscus lens a-1, a negative meniscus lens a-2 and a positive meniscus lens a-3; the zoom group B comprises a second adhesive combination formed by tightly connecting a biconcave lens B-1, a positive meniscus lens B-2 and a biconcave lens B-3; the compensation group C comprises a third adhesive group formed by tightly connecting a biconvex lens C-1, a negative meniscus lens C-2 and a positive meniscus lens C-3; the rear fixed group E comprises a positive meniscus lens E-1, a negative meniscus lens E-2 and a double convex lens E-3.
In the embodiment, the air space between the front fixed group A and the variable-power group B is 4.16-22.87 mm, the air space between the variable-power group B and the compensation group C is 2.78-34.16 mm, the air space between the compensation group C and the rear fixed group E is 2.03-32 mm, and the positive meniscus lens A-3 is made of an ultra-low dispersion N-PK52A material.
In this embodiment, the air space between the positive meniscus lens a-1 and the first cemented group is 0.74mm, the air space between the biconcave lens B-1 and the second cemented group is 1.21mm, the air space between the biconvex lens C-1 and the third cemented group is 0.1mm, the air space between the positive meniscus lens E-1 and the negative meniscus lens E-2 is 0.66mm, and the air space between the negative meniscus lens E-2 and the biconvex lens E-3 is 14.78 mm.
In this embodiment, the radius of curvature R1 of the front mirror surface of the positive meniscus lens a-1 satisfies the relationship: r1 is more than or equal to 42.3mm and less than or equal to 44.987mm, and the curvature radius R2 of the rear mirror surface satisfies the relation: r2 is more than or equal to 198mm and less than or equal to 203.471mm, the thickness is 5.18mm, and the material is N-LASF 31A; the curvature radius R3 of the first combined front mirror surface satisfies the relation: r3 is more than or equal to 113.01mm and less than or equal to 115.214mm, and the curvature radius R4 of the gluing surface satisfies the relation: r4 is more than or equal to 23.8mm and less than or equal to 24.021mm, and the curvature radius R5 of the rear mirror surface satisfies the relation: r5 is more than or equal to 485mm and less than or equal to 512.2mm, the thickness of the negative meniscus lens A-2 is 1.95mm, the material is LAFN7, the thickness of the positive meniscus lens A-3 is 8.83mm, and the material is N-PK 52A; the curvature radius R6 of the front mirror surface of the biconcave lens B-1 satisfies the relation: r6 is more than or equal to-79.45 mm and less than or equal to-77.232 mm, the curvature radius R7 of the rear mirror surface satisfies the relation of 69.1mm more than or equal to R7 and less than or equal to 70.232mm, the thickness is 1.1mm, and the material is N-LAF 21; the curvature radius R8 of the second combined front mirror surface satisfies the relation: -73.213mm or less, R8 mm or less, and-71.25 mm, and the curvature radius R9 of the glued surface satisfies the relation: -16.85mm ≦ R9 ≦ -16.452mm, the radius of curvature of the rear mirror R10 satisfying the relationship: r is more than or equal to 82mm and less than or equal to 84.813mm, the thickness of the positive meniscus lens B-2 is 3.59mm, the material is H-ZF75A, the thickness of the biconcave lens B-3 is 1.1mm, and the material is N-LASF 31A; the curvature radius R11 of the front mirror surface of the biconvex lens C-1 satisfies the relation: r11 is more than or equal to 47.5mm and less than or equal to 48.312mm, and the curvature radius R12 of the rear mirror surface satisfies the relation: r12 is more than or equal to 135.2mm and less than or equal to 132.2mm, the thickness is 2.08mm, and the material is N-LASF 31A; the radius of curvature R13 of the third cemented front mirror surface satisfies the relation: r is more than or equal to 52mm and less than or equal to 60.23mm, and the curvature radius R14 of the gluing surface satisfies the relation: r14 is more than or equal to 10.89mm and less than or equal to 11.05mm, and the curvature radius R15 of the rear mirror surface satisfies the relation: r15 is more than or equal to 420mm and less than or equal to 99999999mm, the thickness of the negative meniscus lens C-2 is 0.95mm, the material is H-ZF75A, the thickness of the positive meniscus lens C-3 is 3.89mm, and the material is N-LASF 31A; the radius of curvature R16 of the front mirror surface of the positive meniscus lens E-1 satisfies the relation: r16 is more than or equal to 10.5mm and less than or equal to 13.989mm, and the curvature radius R17 of the rear mirror surface satisfies the relation: r17 is more than or equal to 20.45mm and less than or equal to 27.89mm, the thickness is 1.88mm, and the material is N-SF 57; the radius of curvature R18 of the front mirror surface of the negative meniscus lens E-2 satisfies the relationship: r18 is more than or equal to 30.1mm and less than or equal to 36.79mm, and the curvature radius R19 of the rear mirror surface satisfies the relation: r19 is more than or equal to 8.2mm and less than or equal to 9.35mm, the thickness is 2.66mm, and the material is N-LASF 46A; the curvature radius R20 of the front mirror surface of the biconvex lens E-3 satisfies the relation: RR20 is more than or equal to 27mm and less than or equal to 28.3mm, and the curvature radius R21 of the rear mirror surface satisfies the relation: r20-210.01 mm is more than or equal to 240.1mm, the thickness is 2.07mm, the material is H-FK61, and the air space between the biconvex lens E-3 and the imaging target surface is 14.87 +/-0.25 mm.
The optical system formed by the lens group achieves the following optical indexes:
1. the working wave band is as follows: 900 nm-1700 nm;
2. focal length: 28 mm-90.5 mm;
3. the field angle: 7.69-25.69 degrees;
4. relative pore diameter: d/f' is greater than 1/4;
5. optical transfer function: when the spatial frequency of the transfer function is 70p/mm, the central MTF is more than or equal to 0.4 in the long focus and the short focus, the imaging quality is still good in the maximum view field, and the MTF of the edge view field is more than or equal to 0.24, so that the infrared camera can be matched with an 2/3' target surface short wave infrared camera with the pixel size of 7 um.
6. The optical total length is less than 109.5 mm;
7. the zoom whole zoom time is 5S;
8. working temperature: the temperature is between 40 ℃ below zero and 60 ℃, the optical passive athermalization design is realized, and temperature focusing is not needed.
In order to realize system compactness, the total length of an optical system needs to be shortened as much as possible, the radial size needs to be reduced, and the moving range of a variable-magnification group and a compensation group of the system is as small as possible, so that the design of a steepest zooming cam curve is adopted, when the multiplying power m2= -1 of the variable-magnification group, the multiplying power m31= m32= -1 of the compensation group is adopted, the position of the focal point is in smooth transition, the steepest zooming is realized, the lead is small, the total optical length is short, and the system is small in size.
The invention relates to a short-wave infrared optical athermalized continuous zoom lens, which comprises the following components: (1) by adopting the positive compensation structure, the focal power of the front group is smaller, the secondary spectral aberration is reduced, and an ultra-low dispersion material is used, so that the resolution level of a long focal length is greatly improved, and the use requirement of a short wave infrared camera with the pixel size of 7um can be met. (2) Continuous zooming, and simultaneously meeting the requirements of large-area panoramic search and small-area enlarged observation. (3) The optical passive athermalization design is realized, and temperature focusing is not needed under a wide temperature dynamic range, so that the structure is simple, and the product failure rate is reduced.
The lens adopts a positive group compensation four-component structure, when the zoom group moves back and forth, the compensation group moves simultaneously to ensure that an image plane is not changed, and the process realizes the change of the focal length of the lens; by reasonably distributing the focal power of the four components, the lens has a longer focal length under a smaller length size. The front group uses 1 piece of ultra-low dispersion glass, effectively reduces the aberration of the optical lens such as the secondary spectrum, obviously improves the resolution of the lens, and achieves the purpose of being matched with the small-pixel camera.
In this embodiment, the mechanical structure of the lens includes a zoom compensation zoom mechanism having a zoom group B and a compensation group C, the zoom compensation zoom mechanism includes a main lens barrel 64, the inner front end of the main lens barrel is provided with a zoom component 42 having the zoom group B, the inner rear end of the main lens barrel is provided with a compensation component 44 having the compensation group C, the front end of the main lens barrel is provided with a front fixing component 41, the front fixing component includes a front group lens barrel 55 having a front fixing group a, the rear end of the main lens barrel is provided with a rear fixing component 45, and the rear fixing component includes a rear group lens barrel 72 having a rear fixing group D.
In this embodiment, the front end of the front group lens barrel is screwed with a pressing ring 52 for pressing the biconvex lens a-1, and an AB spacer 53 is arranged between the biconvex lens a-1 and the first glue combination; the zooming assembly comprises a zooming lens base provided with a zooming group B, the zooming assembly is arranged on a zooming movable base 63, the compensating assembly comprises a compensating lens base provided with a compensating group C, the compensating assembly is arranged on a compensating movable base 67, the zooming assembly is connected with the zooming movable base 63 through threads, the compensating assembly is connected with the compensating movable base 67 through threads, and the zooming movable base and the compensating movable base are respectively arranged in the main lens barrel 64 through grinding matching with the guide rod 65.
In this embodiment, the main barrel is sleeved with a zoom cam, the zoom cam 66 is sleeved in the main barrel 64 and is installed in the main barrel 64 through a cam cover plate 62, the zoom cam 66 is provided with two zoom curve slots and a compensation curve slot which are uniformly distributed, the main barrel is provided with a guide nail slot, the zoom curve slot is connected with the zoom movable seat through a zoom guide nail and a zoom straight slot, and the compensation curve slot is connected with the compensation movable seat through a compensation guide nail and a compensation straight slot.
In this embodiment, a zoom motor 617 that is geared with a zoom cam through a motor gear is provided outside the main barrel 64, a zoom potentiometer 611 is geared with the zoom cam 66 through a potentiometer gear 613, when the rotor of the zoom motor rotates positively and negatively, the zoom potentiometer and the zoom cam rotate synchronously, the resistance value of the zoom potentiometer changes, and the change value of the zoom potentiometer can be taken out through a suitable sampling circuit and transmitted to the control center, thereby displaying the zoom value.
In this embodiment, the front and rear ends of the lens are respectively provided with a rolling bearing for supporting, the rolling bearing 79 at the rear end is mounted in a rear bearing seat 73, and six threaded connection holes of M3 are drilled on the rear bearing seat.
In this embodiment, the positive meniscus lens E1, the negative meniscus lens E2, and the double convex lens E3 mount the rear fixed group E in the rear group barrel 72 through the rear group pressing ring 77, a first rear group spacer ring 712 is disposed between the positive meniscus lens E1 and the negative meniscus lens E2, a second rear group spacer ring 710 is disposed between the negative meniscus lens E2 and the double convex lens E3, and the rear bearing seat mounts the rear fixed group in the rear bearing seat through the rolling bearing 79.
The above-mentioned preferred embodiments, further illustrating the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned are only preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. The utility model provides a short wave infrared optics does not have thermalization zoom lens which characterized in that: the optical system of the lens comprises a front fixed group A with positive focal power, a zoom group B with negative focal power, a compensation group C with positive focal power, a diaphragm D and a rear fixed group E with positive focal power, which are sequentially arranged along the direction of light incidence from front to back, wherein the front fixed group A comprises a positive meniscus lens A-1, a negative meniscus lens A-2 and a first bonding group of the positive meniscus lens A-3 in tight joint; the zoom group B comprises a second adhesive combination formed by tightly connecting a biconcave lens B-1, a positive meniscus lens B-2 and a biconcave lens B-3; the compensation group C comprises a third adhesive group formed by tightly connecting a biconvex lens C-1, a negative meniscus lens C-2 and a positive meniscus lens C-3; the rear fixed group E comprises a positive meniscus lens E-1, a negative meniscus lens E-2 and a double convex lens E-3; the air space between the positive meniscus lens A-1 and the first glue group is 0.74mm, the air space between the double concave lens B-1 and the second glue group is 1.21mm, the air space between the double convex lens C-1 and the third glue group is 0.1mm, the air space between the positive meniscus lens E-1 and the negative meniscus lens E-2 is 0.66mm, and the air space between the negative meniscus lens E-2 and the double convex lens E-3 is 14.78 mm.
2. The short wave infrared optical athermalized zoom lens of claim 1, wherein: the air space between the front fixed group A and the zooming group B is 4.16-22.87 mm, the air space between the zooming group B and the compensation group C is 2.78-34.16 mm, the air space between the compensation group C and the rear fixed group E is 2.03-32 mm, and the positive meniscus lens A-3 is made of an ultra-low dispersion N-PK52A material.
3. The short wave infrared optical athermalized zoom lens of claim 1, wherein: the curvature radius R1 of the front mirror surface of the positive meniscus lens A-1 satisfies the relation: r1 is more than or equal to 42.3mm and less than or equal to 44.987mm, and the curvature radius R2 of the rear mirror surface satisfies the relation: r2 is more than or equal to 198mm and less than or equal to 203.471mm, and the thickness is 5.18 mm; the curvature radius R3 of the first combined front mirror surface satisfies the relation: r3 is more than or equal to 113.01mm and less than or equal to 115.214mm, and the curvature radius R4 of the gluing surface satisfies the relation: r4 is more than or equal to 23.8mm and less than or equal to 24.021mm, and the curvature radius R5 of the rear mirror surface satisfies the relation: r5 is more than or equal to 485mm and less than or equal to 512.2mm, the thickness of the negative meniscus lens A-2 is 1.95mm, and the thickness of the positive meniscus lens A-3 is 8.83 mm; the curvature radius R6 of the front mirror surface of the biconcave lens B-1 satisfies the relation: r6 is more than or equal to-79.45 mm and less than or equal to-77.232 mm, the curvature radius R7 of the rear mirror surface satisfies the relation of 69.1mm more than or equal to R7 more than or equal to 70.232mm, and the thickness is 1.1 mm; the curvature radius R8 of the second combined front mirror surface satisfies the relation: -73.213mm or less, R8 mm or less, and-71.25 mm, and the curvature radius R9 of the glued surface satisfies the relation: -16.85mm ≦ R9 ≦ -16.452mm, the radius of curvature of the rear mirror R10 satisfying the relationship: r is more than or equal to 82mm and less than or equal to 84.813mm, the thickness of the positive meniscus lens B-2 is 3.59mm, and the thickness of the double concave lens B-3 is 1.1 mm; the curvature radius R11 of the front mirror surface of the biconvex lens C-1 satisfies the relation: r11 is more than or equal to 47.5mm and less than or equal to 48.312mm, and the curvature radius R12 of the rear mirror surface satisfies the relation: r12 is more than or equal to 135.2mm and less than or equal to 132.2mm, and the thickness is 2.08 mm; the radius of curvature R13 of the third cemented front mirror surface satisfies the relation: r is more than or equal to 52mm and less than or equal to 60.23mm, and the curvature radius R14 of the gluing surface satisfies the relation: r14 is more than or equal to 10.89mm and less than or equal to 11.05mm, and the curvature radius R15 of the rear mirror surface satisfies the relation: r15 is more than or equal to 420mm and less than or equal to 99999999mm, the thickness of the negative meniscus lens C-2 is 0.95mm, and the thickness of the positive meniscus lens C-3 is 3.89 mm; the radius of curvature R16 of the front mirror surface of the positive meniscus lens E-1 satisfies the relation: r16 is more than or equal to 10.5mm and less than or equal to 13.989mm, and the curvature radius R17 of the rear mirror surface satisfies the relation: r17 is more than or equal to 20.45mm and less than or equal to 27.89mm, and the thickness is 1.88 mm; the radius of curvature R18 of the front mirror surface of the negative meniscus lens E-2 satisfies the relationship: r18 is more than or equal to 30.1mm and less than or equal to 36.79mm, and the curvature radius R19 of the rear mirror surface satisfies the relation: r19 is more than or equal to 8.2mm and less than or equal to 9.35mm, and the thickness is 2.66 mm; the curvature radius R20 of the front mirror surface of the biconvex lens E-3 satisfies the relation: r20 is more than or equal to 27mm and less than or equal to 28.3mm, and the curvature radius R21 of the rear mirror surface satisfies the relation: r21 is more than or equal to 240.1mm and less than or equal to 210.01mm, and the thickness is 2.07 mm.
4. The short wave infrared optical athermalized zoom lens of claim 1, wherein: the mechanical structure of camera lens is including installing the zoom compensation zoom mechanism of zoom group B and compensation group C, zoom compensation zoom mechanism includes the main lens cone, the interior front end of main lens cone is equipped with the zoom subassembly of installing zoom group B, the interior rear end of main lens cone is equipped with the compensation subassembly of installing compensation group C, and the main lens cone front end is equipped with preceding fixed subassembly, and preceding fixed subassembly is including installing preceding group's lens cone of preceding fixed group A, and the main lens cone rear end is equipped with the back fixed subassembly, and the back fixed subassembly is including installing the back group's lens cone of back fixed group D.
5. The short-wave infrared optical athermalization zoom lens of claim 4, wherein: the front end of the front group lens barrel is in screwed connection with a pressing ring for pressing the biconvex lens A-1, and an AB space ring is arranged between the biconvex lens A-1 and the first glue combination; the zoom assembly comprises a zoom lens base provided with a zoom group B, the zoom assembly is arranged on a zoom moving base and comprises a compensation lens base provided with a compensation group C, the compensation assembly is arranged on the compensation moving base and is connected with the zoom moving base through threads, the compensation assembly is connected with the compensation moving base through threads, a zoom cam is sleeved in the main lens barrel, and a zoom motor in meshing transmission with the zoom cam through a motor gear is arranged outside the main lens barrel.
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