CN107976791B - Super-large-magnification continuous zooming uncooled infrared lens - Google Patents

Super-large-magnification continuous zooming uncooled infrared lens Download PDF

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Publication number
CN107976791B
CN107976791B CN201711158574.1A CN201711158574A CN107976791B CN 107976791 B CN107976791 B CN 107976791B CN 201711158574 A CN201711158574 A CN 201711158574A CN 107976791 B CN107976791 B CN 107976791B
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lens
zoom
focusing
fixed
optical
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CN107976791A (en
Inventor
李勇
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Hubei Jiuzhiyang Infrared System Co Ltd
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Hubei Jiuzhiyang Infrared System 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
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/16Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B7/00Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B7/00Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/10Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens

Abstract

The invention discloses an ultra-large-magnification continuous zooming uncooled infrared lens, which comprises a continuous zooming optical system and a resistance reducing structure assembly; the continuous zooming optical system comprises a front fixed lens, a zooming lens, two compensating lenses, a rear fixed lens and a focusing lens; the resistance reducing structure component comprises a fixed main lens cone, a zoom lens seat, a compensation lens seat and a focusing lens seat, wherein a zoom cam and a focusing cam are respectively arranged outside the fixed main lens cone and the focusing lens seat, a motor drives the zoom cam to drive the zoom lens and the compensation lens to move through a zoom large gear, and drives the focusing cam to drive the focusing lens to move through a focusing small gear; the invention can reach farther action distance and better image effect; carry out reasonable collocation with multiple infrared optical material, optimal design focusing lens can fully compensate out of focus that ambient temperature changes and lead to, and focusing effect obviously promotes before than optimizing.

Description

Super-large-magnification continuous zooming uncooled infrared lens
Technical Field
The invention belongs to the technical field of infrared lenses, and particularly relates to an ultra-large magnification continuous zooming uncooled infrared lens.
Background
The non-refrigeration infrared product is widely applied at present, and is widely applied to various fields such as monitoring, warning, surveillance, reconnaissance, forest fire prevention and the like due to the all-weather day and night observation capability. Compared with a refrigeration infrared product, the uncooled thermal infrared imager does not need to refrigerate the detector, so that the cost of the device is greatly reduced, the starting time is greatly shortened, the use is convenient, and the application range is wider.
The continuous zooming uncooled infrared lens is an important component of the thermal infrared imager, can clearly image far and near targets, provides the most suitable picture and view field for users, and is increasingly applied to uncooled infrared products.
Although the continuous zooming uncooled infrared lens disclosed in the prior art has the continuous zooming function, the following defects are mostly existed: 1) the zoom magnification is small. In the current domestic infrared industry, uncooled infrared optical products do not have products with zoom magnification reaching 10 times, most of the uncooled infrared optical products are 3 times or 5 times, and the uncooled infrared optical products need to reach 10 times of super-large magnification, and the main difficulties are image quality optimization, cost control and appearance size of an optical system. 2) The optical system has poor image quality. The continuous zooming optical system has high requirements on optical design, lens group processing precision and adjustment precision due to a plurality of moving lens groups, and an ordinary continuous zooming optical lens is limited by infrared materials and design means and is difficult to realize the optimal imaging effect. 3) The stability and reliability of the zoom mechanism are not good. The common continuous zooming infrared lens has large zooming movement mechanism, poor matching precision, large movement resistance and poor stability and reliability of an optical axis in the zooming process.
Disclosure of Invention
Aiming at the defects of the existing continuous zooming uncooled infrared lens, the invention provides the continuous zooming infrared lens with the super-large multiplying power and the special resistance-reducing structure, which can obviously improve the optical performance of the infrared lens and has better adaptability and practicability.
The technical scheme adopted by the invention for solving the technical problems is as follows: an ultra-high-magnification continuous zooming uncooled infrared lens comprises an ultra-high-magnification continuous zooming optical system and a resistance reducing structure assembly; the continuous zooming optical system comprises a front fixed lens, a zooming lens, two compensating lenses, a rear fixed lens and a focusing lens which are arranged in sequence from an object side to an image side along an optical axis; the anti-drag structure assembly comprises a fixed main lens cone arranged on a base, a zoom lens seat and a compensation lens seat which are sequentially arranged in the fixed main lens cone, and a focusing lens seat arranged at the rear part of the fixed main lens cone, wherein a front fixed lens is fixed at the front end of the fixed main lens cone through a lens spacing ring, a lens pressing ring is also arranged outside the lens spacing ring, an O-shaped ring is also arranged between the front fixed lens and the fixed main lens cone, the zoom lens and the compensation lens are respectively arranged on the zoom lens seat and the compensation lens seat, the focusing lens is arranged on the focusing lens seat, and a rear fixed lens is arranged between the fixed main lens cone and the focusing lens seat; a zoom cam and a focusing cam are respectively arranged outside the fixed main lens cone and the focusing lens base, a motor is also arranged on the base, an output shaft of the motor is respectively connected with a zoom gear wheel and a focusing pinion, the motor drives the zoom cam to drive the zoom lens and the compensating lens to move through the zoom gear wheel to finish the zooming of the optical system, and drives the focusing cam to drive the focusing lens to move through the focusing pinion to finish the focusing of the optical system; a wedge-shaped groove is formed in the front end face of the zoom cam, and balls are filled in the wedge-shaped groove; the front fixed lens is a positive diopter convex-concave lens with a convex surface facing to an object space; the zoom lens is a biconcave lens with negative diopter; the two compensating lenses are respectively a positive diopter concave-convex lens with a concave surface facing an object space and a negative diopter concave-convex lens with a convex surface facing an image space; the rear fixed lens is a concave-convex lens with a convex surface facing the image space and with negative diopter; the focusing lens is a positive diopter concave-convex lens with a convex surface facing to the object space.
A push rod sleeve is arranged between the zoom lens seat and the fixed main lens cone, and a push rod is arranged in the push rod sleeve.
A trimming ring is arranged between the rear end face of the zooming cam and the focusing lens seat, and a gasket is arranged between the rear end face of the fixed main lens cone and the focusing lens seat.
The relative aperture of the continuous zooming optical system is 1: 1.2, and the optical focal length is 20-200 mm.
The front fixed lens is made of a single-crystal germanium material, the zoom lens is made of a single-crystal germanium material, the two compensating lenses are made of a single-crystal germanium material and a zinc selenide material respectively, the rear fixed lens is made of a single-crystal germanium material, and the focusing lens is made of a single-crystal germanium material.
The zoom lens is an aspheric lens, the second compensation lens is an aspheric lens, and the focusing lens is an aspheric diffraction surface lens.
The invention has the beneficial effects that: the invention adopts a negative group zooming and positive group compensating multi-aspheric-surface super-large-magnification continuous zooming optical system, and the relative aperture is 1: 1.2, a longer action distance and a better image effect can be achieved; the focusing lens is optimally designed, the rear group of lenses are adopted for focusing compensation, defocusing caused by environmental temperature change can be fully compensated, and the focusing effect is obviously improved compared with that before optimization; the optical machine design adopts an integrated design idea, the optical design adopts a diaphragm aberration optimization design method, the outer diameter and the stroke of the zoom lens group are compressed to the maximum extent, and the structure adopts a double-groove zoom cam and ball resistance reduction design, so that the precision and the reliability of a motion mechanism are ensured; the invention reasonably collocates a plurality of infrared optical materials, fully eliminates the system aberration and obtains excellent imaging quality.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a 200mm telephoto end of an optical system according to the present invention;
FIG. 3 is a 20mm short focal end schematic of the optical system of the present invention;
FIG. 4 is a graph showing the movement curves of the zoom lens set and the compensation lens set of the optical system of the present invention, wherein the series 1 is the movement curve of the zoom lens, and the series 2 is the movement curve of the compensation lens.
The figures are numbered: 1-lens cap, 2-front fixed lens, 3-lens pressing ring, 4-lens spacer ring, 5-O-shaped ring, 6-zoom lens, 7-ball, 8-push rod, 9-push rod sleeve, 10-zoom cam, 11-zoom gearwheel, 12-compensation lens, 13-main lens cone, 14-trimming ring, 15-gasket, 16-rear fixed lens, 17-focusing lens, 18-zoom lens seat, 19-compensation lens seat, 20-focusing lens seat, 21-focusing cam, 22-motor, 23-base and 24-focusing pinion.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a large-magnification continuous zooming uncooled infrared lens, which comprises a large-magnification continuous zooming optical system and a special resistance-reducing structure assembly as shown in figure 1. Relative aperture of the continuous zoom optical system is equal to 1: 1.2, the optical focal length is 20-200mm, namely the optical system is a 10-time continuous zooming system, the focal length of the long focal end is 200mm, the focal length of the short focal end is 20mm, and the optical system can perform high-definition imaging within the focal length range of 20-200 mm. The continuous zooming optical system comprises optical lenses which are arranged along an optical axis from an object side to an image side in sequence, and comprises a front fixed lens 2, a zooming lens 6, two compensating lenses 12, a rear fixed lens 16 and a focusing lens 17; in one embodiment of the present invention, in order to achieve the best imaging quality, a plurality of aspheric lenses, such as the zoom lens 6, the compensation lens 12 and the focusing lens 17, are disposed in the optical system, so that the system aberration in large-power zooming can be eliminated, and the optical length and the lens volume can be reduced.
The drag reduction structure assembly comprises a fixed main lens barrel 13 arranged on a base 23 and used for fixing an optical lens, a zoom lens seat 18 and a compensation lens seat 19 which are sequentially arranged in the fixed main lens barrel 13, and a focusing lens seat 20 arranged behind the fixed main lens barrel 13, wherein a lens cover 1 is also arranged outside the fixed main lens barrel 13, a front fixed lens 2 is fixed at the front end of the fixed main lens barrel 13 through a lens space ring 4, a lens pressing ring 3 is also arranged outside the lens space ring 4, an O-shaped ring 5 is also arranged between the front fixed lens 2 and the fixed main lens barrel 13, the zoom lens 6 and the compensation lens 12 are respectively arranged on the zoom lens seat 18 and the compensation lens seat 19, the focusing lens 17 is arranged on the focusing lens seat 20, a rear fixed lens 16 is arranged between the fixed main lens barrel 13 and the focusing lens seat 20, a zoom cam 10 and a focusing cam 21 are respectively arranged outside the fixed main lens barrel 13 and the focusing lens seat 20, still be provided with motor 22 on the base 23, be connected with on the output shaft of motor 22 and zoom gear wheel 11 and focusing pinion 24 respectively, motor 22 drives the cam 10 that zooms through zooming gear wheel 11 and drives zoom lens 6 and compensation lens 12 motion, accomplish optical system and zoom, drive focusing cam 21 through focusing pinion 24 and drive focusing lens 17 motion, accomplish optical system focusing, wherein zoom cam 10 and focusing cam 21 adopt the double flute cam form, the cam design has two parallel symmetrical curve grooves promptly, promote the group's motion of zooming jointly, can improve the optical axis stability and the reliability of moving block.
Further, a wedge-shaped groove is formed in the front end face of the zoom cam 10, balls 7 are filled in the wedge-shaped groove, the steel column 7 is located between the zoom cam 10 and the fixed main lens barrel 13, and sliding friction of the zoom mechanism can be converted into rolling friction through the balls 7, so that friction resistance of the movement mechanism in zooming movement is reduced.
Further, a push rod sleeve 9 is arranged between the zoom lens base 18 and the fixed main lens barrel 13, a push rod 8 is arranged in the push rod sleeve 9, when the push rod 8 is pushed downwards, the push rod 8 falls into a limiting groove/hole of the zoom lens base 18, and the zoom lens 6 after the zooming of the optical system is completed is locked.
Furthermore, a trimming ring 14 is arranged between the rear end face of the zoom cam 10 and the focusing lens holder 20, the position of the fixed optical lens is found by repeatedly performing manual trial assembly and test on the trimming ring 14, and a gasket 15 is arranged between the rear end face of the fixed main lens barrel 13 and the focusing lens holder 20 for improving the sealing performance of the fixed main lens barrel and the focusing lens holder.
As a preferred embodiment of the present invention, the following table lists specific parameters of the continuous zoom optical system of the present invention.
The radius of curvature in the above table refers to the radius of curvature of each surface, and the pitch refers to the distance between two adjacent surfaces, for example, the pitch of the surface S1, i.e., the distance from the surface S1 to the surface S2. The glass material is used for manufacturing the lens.
The aspherical coefficients of the surface S4, the surface S8, and the surface S11 are listed below.
The displacement of the aspherical surface in the optical axis direction with respect to the surface vertex is defined as follows:
wherein, the meaning of each parameter is as follows:
z-displacement in the direction of the optical axis; h-height of the optical axis; c-lens curvature; k is the coefficient of the quadric surface; A. b, C-aspheric coefficients.
The following table shows the diffraction surface coefficients of surface S11.
Wherein, the meaning of each parameter is as follows:
c1: first order coefficient of diffraction
C2: diffraction second order coefficient.
The invention adopts the super-large multiplying power continuous zooming optical system technology, adopts a negative group zooming and positive group compensating multi-aspheric surface high-image-quality optical system, and has the relative aperture of 1: 1.2, a longer action distance and a better image effect can be achieved; various infrared optical materials are reasonably matched, so that system aberration is fully eliminated, and excellent imaging quality is obtained; the focusing lens is optimally designed, the rear group of lenses are adopted for focusing compensation, defocusing caused by environmental temperature change can be fully compensated, and the focusing effect is obviously improved compared with that before optimization.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims (6)

1. The utility model provides an uncooled infrared camera lens of continuous zooming of super large multiplying power which characterized in that: the device comprises an ultra-high-magnification continuous zooming optical system and a resistance-reducing structure assembly;
the continuous zooming optical system comprises a front fixed lens (2), a zooming lens (6), two compensating lenses (12), a rear fixed lens (16) and a focusing lens (17) which are arranged in sequence from an object side to an image side along an optical axis;
the anti-drag structure component comprises a fixed main lens cone (13) arranged on a base (23), a zoom lens seat (18) and a compensation lens seat (19) which are sequentially arranged in the fixed main lens cone (13), and a focusing lens seat (20) arranged at the rear of the fixed main lens cone (13), the front fixed lens (2) is fixed at the front end of the fixed main lens cone (13) through a lens space ring (4), a lens pressing ring (3) is arranged outside the lens space ring (4), an O-shaped ring (5) is arranged between the front fixed lens (2) and the fixed main lens cone (13), the zoom lens (6) and the compensation lens (12) are respectively arranged on a zoom lens seat (18) and a compensation lens seat (19), the focusing lens (17) is arranged on the focusing lens seat (20), and the rear fixed lens (16) is arranged between the fixed main lens barrel (13) and the focusing lens seat (20);
a zoom cam (10) and a focus cam (21) are respectively arranged outside the fixed main lens barrel (13) and the focus lens base (20), a motor (22) is further arranged on the base (23), an output shaft of the motor (22) is respectively connected with a zoom gear wheel (11) and a focus pinion (24), the motor (22) drives the zoom cam (10) through the zoom gear wheel (11) to drive the zoom lens (6) and the compensation lens (12) to move, so that the zooming of an optical system is completed, and the focus cam (21) is driven through the focus pinion (24) to drive the focus lens (17) to move, so that the focusing of the optical system is completed;
a wedge-shaped groove is formed in the front end face of the zoom cam (10), and a ball (7) is filled in the wedge-shaped groove;
the front fixed lens (2) is a positive diopter convex-concave lens with a convex surface facing to an object space; the zoom lens (6) is a biconcave lens with negative diopter; the two compensating lenses (12) are respectively a positive diopter concave-convex lens with a concave surface facing an object space and a negative diopter concave-convex lens with a convex surface facing an image space; the rear fixed lens (16) is a concave-convex lens with negative diopter and the convex surface faces the image space; the focusing lens (17) is a positive diopter concave-convex lens with a convex surface facing the object space.
2. An ultra-high-magnification continuous-zooming uncooled infrared lens as claimed in claim 1, wherein a push rod sleeve (9) is arranged between the zoom lens base (18) and the fixed main lens barrel (13), and a push rod (8) is arranged in the push rod sleeve (9).
3. An ultra-high magnification continuous zooming uncooled infrared lens as claimed in claim 1, wherein a trimming ring (14) is arranged between the rear end face of the zooming cam (10) and the focusing lens holder (20), and a gasket (15) is arranged between the rear end face of the fixed main barrel (13) and the focusing lens holder (20).
4. The uncooled infrared lens of claim 1, wherein the relative aperture of the zoom optical system is 1: 1.2, and the optical focal length is 20-200 mm.
5. The uncooled infrared lens of continuous zoom with super large magnification according to claim 1, 2, 3 or 4, wherein the front fixed lens (2) is made of a single crystal germanium material, the zoom lens (6) is made of a single crystal germanium material, the two compensating lenses (12) are made of a single crystal germanium material and a zinc selenide material, the rear fixed lens (16) is made of a single crystal germanium material, and the focusing lens (17) is made of a single crystal germanium material.
6. An uncooled infrared lens with continuous zoom of extra large power as claimed in claim 1, 2, 3 or 4, wherein the zoom lens (6) is an aspheric lens, the second of the two compensating lenses (12) is an aspheric lens, and the focusing lens (17) is an aspheric diffractive surface lens.
CN201711158574.1A 2017-11-20 2017-11-20 Super-large-magnification continuous zooming uncooled infrared lens Active CN107976791B (en)

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Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
CN110595623B (en) * 2019-08-12 2020-10-20 湖北久之洋红外系统股份有限公司 Refrigeration type thermal infrared imager
CN111787203B (en) * 2020-07-14 2021-08-06 孝感华中精密仪器有限公司 Camera and video all-in-one machine based on image space scanning
CN112099182A (en) * 2020-09-29 2020-12-18 湖北华中光电科技有限公司 Large-view-field high-zoom-ratio continuous zoom lens based on double-group compensation

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CN106443991A (en) * 2016-12-16 2017-02-22 福建福光天瞳光学有限公司 Long shot type long wave infrared motorized zoom lens and operating method thereof
CN106932891A (en) * 2017-04-19 2017-07-07 福建福光天瞳光学有限公司 25 ~ 75mm long-wave infrared continuous zoom lens and its method of work

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CN100582860C (en) * 2007-02-20 2010-01-20 富士能株式会社 Three-group zoom lens and imaging device
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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
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