CN112485897A - Refrigeration type medium wave infrared stepping zoom lens - Google Patents
Refrigeration type medium wave infrared stepping zoom lens Download PDFInfo
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- CN112485897A CN112485897A CN202011557173.5A CN202011557173A CN112485897A CN 112485897 A CN112485897 A CN 112485897A CN 202011557173 A CN202011557173 A CN 202011557173A CN 112485897 A CN112485897 A CN 112485897A
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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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—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 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
- G02B15/167—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 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
- G02B15/173—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 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 +-+
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Abstract
The invention relates to a refrigeration type medium wave infrared stepping zoom lens which comprises a zoom objective lens group and a secondary imaging lens group. Wherein the varifocal objective lens group is sequentially provided with a front fixed group, a zoom group and a rear fixed group along an optical axis; the secondary imaging lens group is sequentially provided with a secondary imaging lens 1, a secondary imaging lens 2 and a secondary imaging lens 3 along an optical axis. The zoom objective lens group and the secondary imaging lens group are positioned on the same optical axis, the zoom lens group moves along the optical axis, and the positions of the other lens groups are unchanged; the invention aims at the refrigeration type 650 x 512 infrared focal plane detector to realize two-gear zooming with the focal length of the lens between 50mm and 250mm, and the stroke of the zoom group is short. The lens is made of three common optical infrared materials of monocrystalline silicon, monocrystalline germanium and silicon dioxide, and is convenient to process, small in size, light in weight and easy to carry. Meanwhile, the surface of the lens adopts an aspheric surface design, so that the optical aberration of the system is effectively reduced, and the resolution of the system is greatly improved.
Description
Technical Field
The invention relates to a refrigeration type medium-wave infrared stepping zoom lens.
Background
The infrared thermal imaging system has increasingly wide application range and prominent importance, is widely applied to multiple fields of national defense, public security, industrial detection and the like, and has very important application value in civil and military aspects. The infrared optical system is a core component of the infrared thermal imager, and directly influences the performance of the whole system. The infrared zoom optical system can change the focal length within a certain range so as to obtain different field angles, different target images and different scene ranges. With the great development of infrared optical technology and the continuous expansion of the application range thereof, the demand on the infrared zoom optical system is increasingly enhanced.
At present, in a refrigeration type infrared medium wave zoom lens, the stepping continuous zooming is more, and mainly the zooming is realized by switching lens groups in an optical path or changing the interval of an adjacent group of lenses through relative movement. The former has more lenses and relatively complex structure; the latter has long motion stroke and complex structure. The invention realizes the stepping zoom function by changing the relative position of one lens in the system, and has the characteristics of short stroke, small volume, easy carrying, stable image surface, good imaging quality, compact structure and high reliability, and can meet the requirements of users.
Disclosure of Invention
The invention aims to provide a refrigeration type medium-wave infrared stepping zoom lens which has the characteristics of simplicity in manufacture, small size, convenience in operation and high imaging quality and meets the actual use requirement.
The technical scheme provided by the invention is realized as follows:
a refrigeration type medium wave infrared stepping zoom lens comprises a zoom objective lens group and a secondary imaging lens group; the zoom objective lens group is sequentially provided with a front fixed group, a zoom group and a rear fixed group along an optical axis, and the secondary imaging lens group is sequentially provided with a secondary imaging lens 1, a secondary imaging lens 2 and a secondary imaging lens 3 along the optical axis; the front fixed group, the zoom group, the rear fixed group and the secondary imaging lens group are on the same optical axis, the zoom group can move along the optical axis, and the positions of the other lens groups are unchanged;
the front fixed group, the zoom group and the rear fixed group respectively have positive, negative and positive contributions to the focal power of the system;
the front fixed group (1) lens is a meniscus lens with positive focal power facing an image space, the optical parameters of the meniscus lens have the curvature radius of 54mm on the front surface and 75mm on the rear surface, the center thickness is 7mm, and the front fixed group (1) lens is made of monocrystalline silicon;
the zoom group (2) lens is a negative focal power biconcave lens, the radius of curvature of optical parameters of the zoom group (2) is-115 mm on the front surface and 91mm on the rear surface, the center thickness of the zoom group is 3mm, the zoom group is made of single crystal germanium, achromatism is realized, and field curvature and astigmatism are effectively corrected.
The rear fixing group consists of a positive focal power double convex lens (3) and a positive focal power meniscus lens (4), wherein the positive focal power double convex lens has optical parameters of curvature radius of 36mm at the front surface, 429mm at the rear surface and central thickness of 5mm, is made of monocrystalline silicon, and has optical parameters of curvature radius of 89mm at the front surface, 345mm at the rear surface and central thickness of 3mm, and is made of monocrystalline germanium.
The secondary imaging lens 1 is a negative focal power meniscus lens (5), the optical parameters of the curvature radius are-24 mm on the front surface, -25mm on the rear surface and 2mm in the center thickness, and the material is monocrystalline germanium. The secondary imaging lens 2 is a positive focal power meniscus lens (6), the optical parameters of the curvature radius of the secondary imaging lens are-11 mm on the front surface, -16mm on the rear surface and 1.5mm in the center thickness, and the secondary imaging lens is made of silicon dioxide crystals. The secondary imaging lens 3 is a positive focal power meniscus lens (7), the optical parameters of the curvature radius is 7mm on the front surface, 8mm on the rear surface and 2mm in the center thickness, and the material is monocrystalline germanium.
The front surface of the front fixed group of the meniscus lens (1), the front surface of the rear fixed group of the biconvex lens (3), the front surface of the meniscus lens (5) of the secondary imaging lens and the front surface of the meniscus lens (7) are aspheric surfaces.
The invention has the beneficial effects that: the refrigeration type medium wave infrared zoom lens comprises a zoom objective lens group and a secondary imaging lens group. Wherein the varifocal objective lens group is sequentially provided with a front fixed group, a zoom group and a rear fixed group along an optical axis; the secondary imaging lens group is sequentially provided with a secondary imaging lens 1, a secondary imaging lens 2 and a secondary imaging lens 3 along an optical axis. The zoom objective lens group and the secondary imaging lens group are positioned on the same optical axis, the zoom lens group moves along the optical axis, and the positions of the other lens groups are unchanged; the invention aims at the refrigeration type 650 x 512 infrared focal plane detector to realize two-gear zooming with the focal length of the lens between 50mm and 250mm, and the stroke of the zoom group is short. The lens is made of three common optical infrared materials of monocrystalline silicon, monocrystalline germanium and silicon dioxide, and is convenient to process, small in size, light in weight and easy to carry. Meanwhile, the surface of the lens adopts an aspheric surface design, so that the optical aberration of the system is effectively reduced, and the resolution of the system is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a short-focus state optical path of a refrigerated mid-wave infrared step-zoom lens;
FIG. 2 is a telephoto-state optical path diagram illustration of a chilled-type mid-wave infrared step-zoom lens;
wherein, 1-front fixed group, 2-variable power group, 3, 4-rear fixed group, 5-secondary imaging lens 1, 6-secondary imaging lens 2, 7-secondary imaging lens 3
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
1. referring to fig. 1 and 2, a refrigerating medium-wave infrared stepped zoom lens includes a zoom objective lens group and a secondary imaging lens, which share 7 lenses; the zoom objective lens group is sequentially provided with a front fixed group, a zoom group and a rear fixed lens group along an optical axis. The secondary imaging lens group is sequentially provided with a secondary imaging lens 1, a secondary imaging lens 2 and a secondary imaging lens 3 along an optical axis.
The front fixed group is a first meniscus lens 1 with positive focal power facing an image space, the optical parameters of the front fixed group are 54mm of curvature radius of the front surface and 75mm of curvature radius of the rear surface, the center thickness is 7mm, and the front fixed group is made of monocrystalline silicon materials.
The zoom group is a negative focal power biconcave lens 2, the curvature radius of optical parameters of the zoom group is-115 mm on the front surface and 91mm on the rear surface, the center thickness of the zoom group is 3mm, the zoom group is made of a single-crystal germanium material, achromatism is realized, the control and the correction of field curvature and astigmatism are facilitated, and the focal length of the whole system is changed through the movement of the zoom group.
The rear fixed group consists of a positive focal power biconvex lens 3 and a positive focal power object-oriented second meniscus lens 4, wherein the positive focal power biconvex lens has optical parameters of a curvature radius of 36mm on the front surface, a radius of-429 mm on the rear surface and a central thickness of 5mm, and consists of monocrystalline silicon materials; the radius of curvature of optical parameters of the second meniscus lens with the positive focal power facing the object space is-89 mm on the front surface, 345mm on the rear surface and 3mm in the center thickness, and the second meniscus lens is made of a single crystal germanium material and is used for correcting the field curvature and chromatic aberration of the system.
The secondary imaging front lens is a third meniscus lens 5 with negative focal power facing the object space, has optical parameters of curvature radius of-24 mm on the front surface, -25mm on the rear surface and central thickness of 2mm, and is made of a single crystal germanium material;
the optical parameters of the positive focal power object-oriented fourth meniscus lens 6 in the secondary imaging have the curvature radius of-11 mm on the front surface, 16mm on the rear surface and 1.5mm in the center thickness, and the lens is made of silicon dioxide crystal material;
the secondary imaging rear lens is made of a single-crystal germanium material, wherein the optical parameter curvature radius of the fifth meniscus lens 7 with the positive focal power facing the image space is 7mm on the front surface, 8mm on the rear surface and 2mm in the center thickness;
the front surface of the front fixed group of the meniscus lens (1), the front surface of the rear fixed group of the biconvex lens (3), the front surface of the meniscus lens (5) of the secondary imaging lens and the front surface of the meniscus lens (7) are aspheric surfaces.
Because the zoom objective lens group of the refrigeration type medium-wave infrared zoom lens adopts the design modes of the front fixed group, the zoom group and the rear fixed group, the contribution of each group component to the focal power of the system is positive, negative and positive respectively; the secondary imaging lens group can compress the effective light-passing aperture of the zoom objective lens group, and the distance between the diaphragm and the imaging surface is 20mm, so that the infrared optical system can meet the cold diaphragm efficiency of 100%.
With the improvement of the cold processing capability of the infrared lens, the aberration of the system can be effectively reduced and the imaging resolution of the system can be improved by using the aspheric surface design in the optical system, and meanwhile, the number of lenses of the secondary imaging lens group is reduced, so that the optical transmittance of the infrared system is improved.
In conclusion, the refrigeration type medium wave infrared zoom lens can realize double-gear zooming of 50-250 mm by the design of the curvature radius of each lens surface of the zoom objective lens group and the secondary imaging lens group, the selection of materials and the athermalization design, the working waveband is 3-5 mu m, and the refrigeration type medium wave infrared zoom lens can normally work in most environmental temperature ranges. And overall structure is simple relatively, easily makes, easily assembles, and is small, light in weight, easily carries, effectively reduces the requirement of debug precision, and the formation of image is of high quality, satisfies user's actual demand.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (5)
1. The utility model provides a refrigeration type medium wave infrared stepping zoom lens which characterized in that: the zoom objective lens group is sequentially provided with a front fixing group (1), a zoom group (2) and a rear fixing group along an optical axis, wherein the rear fixing group consists of a positive focal power double-convex lens (3) and a positive focal power meniscus lens (4). The secondary imaging lens group is sequentially provided with a secondary imaging lens 1(5), a secondary imaging lens 2(6) and a secondary imaging lens 3(7) along an optical axis; the front fixed group, the zoom group, the rear fixed group and the secondary imaging lens group are positioned on the same optical axis, the zoom group moves along the optical axis, and the positions of the rest lens groups are unchanged. The front fixed group (1) lens is a meniscus lens with positive focal power facing an image space, the optical parameters of the meniscus lens have the curvature radius of 54mm on the front surface and 75mm on the rear surface, the center thickness is 7mm, and the front fixed group (1) lens is made of monocrystalline silicon; the zoom group (2) lens is a negative focal power biconcave lens, the radius of curvature of optical parameters of the zoom group (2) is-115 mm on the front surface and 91mm on the rear surface, the center thickness of the zoom group is 3mm, the zoom group is made of single crystal germanium, achromatism is realized, and field curvature and astigmatism are effectively corrected. The rear fixing group consists of a positive focal power biconvex lens (3) and a positive focal power meniscus lens (4), wherein the positive focal power biconvex lens has optical parameters of curvature radius of 36mm on the front surface, 429mm on the rear surface and 5mm in central thickness, is made of monocrystalline silicon, has optical parameters of curvature radius of 89mm on the front surface, 345mm on the rear surface and 3mm in central thickness, is made of monocrystalline germanium and is used for correcting the field curvature and chromatic aberration of the system.
2. The refrigerated medium wave infrared stepping zoom lens of claim 1, wherein: the secondary imaging lens 1 is a negative focal power meniscus lens (5), the optical parameters of the curvature radius are-24 mm on the front surface, -25mm on the rear surface and 2mm in the center thickness, and the material is monocrystalline germanium.
3. The refrigerated medium wave infrared stepping zoom lens of claim 1, wherein: the secondary imaging lens 2 is a positive focal power meniscus lens (6), the optical parameters of the curvature radius of the secondary imaging lens are-11 mm on the front surface, -16mm on the rear surface and 1.5mm in the center thickness, and the secondary imaging lens is made of silicon dioxide crystals.
4. The refrigerated medium wave infrared stepping zoom lens of claim 1, wherein: the secondary imaging lens 3 is a positive focal power meniscus lens (7), the optical parameters of the curvature radius is 7mm on the front surface, 8mm on the rear surface and 2mm in the center thickness, and the material is monocrystalline germanium.
5. The refrigerated medium wave infrared stepping zoom lens of claim 1, wherein: the front surface of the front fixed group of the meniscus lens (1), the front surface of the rear fixed group of the biconvex lens (3), the front surface of the meniscus lens (5) of the secondary imaging lens and the front surface of the meniscus lens (7) are aspheric surfaces.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011557173.5A CN112485897A (en) | 2020-12-25 | 2020-12-25 | Refrigeration type medium wave infrared stepping zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011557173.5A CN112485897A (en) | 2020-12-25 | 2020-12-25 | Refrigeration type medium wave infrared stepping zoom lens |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389570A (en) * | 2013-07-23 | 2013-11-13 | 中国科学院长春光学精密机械与物理研究所 | Medium wave infrared continuous zooming optical system with high zoom ratio |
| CN106342261B (en) * | 2010-09-03 | 2014-02-05 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of infrared variable focal length optical system |
| CN104570297A (en) * | 2014-12-30 | 2015-04-29 | 中国科学院西安光学精密机械研究所 | Refrigeration type medium wave infrared stepping zooming tracking lens |
| CN108761748A (en) * | 2018-08-10 | 2018-11-06 | 济南和普威视光电技术有限公司 | A kind of medium wave refrigeration infrared continuous zoom lens |
-
2020
- 2020-12-25 CN CN202011557173.5A patent/CN112485897A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106342261B (en) * | 2010-09-03 | 2014-02-05 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of infrared variable focal length optical system |
| CN103389570A (en) * | 2013-07-23 | 2013-11-13 | 中国科学院长春光学精密机械与物理研究所 | Medium wave infrared continuous zooming optical system with high zoom ratio |
| CN104570297A (en) * | 2014-12-30 | 2015-04-29 | 中国科学院西安光学精密机械研究所 | Refrigeration type medium wave infrared stepping zooming tracking lens |
| CN108761748A (en) * | 2018-08-10 | 2018-11-06 | 济南和普威视光电技术有限公司 | A kind of medium wave refrigeration infrared continuous zoom lens |
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