CN113805324B - Large-caliber transmission type medium wave refrigeration infrared continuous zooming thermal imager - Google Patents
Large-caliber transmission type medium wave refrigeration infrared continuous zooming thermal imager Download PDFInfo
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- CN113805324B CN113805324B CN202111247528.5A CN202111247528A CN113805324B CN 113805324 B CN113805324 B CN 113805324B CN 202111247528 A CN202111247528 A CN 202111247528A CN 113805324 B CN113805324 B CN 113805324B
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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
- G02B15/15—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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
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Abstract
The invention relates to a large-caliber transmission type medium wave refrigerating infrared continuous zooming thermal imager, which aims to solve the technical problems of larger size of a refraction and reflection type system, large adjustment difficulty, serious energy loss in a central area, small light transmission caliber of a small-caliber transmission type system, low energy detection capability and relatively short acting distance in the conventional continuous zooming infrared thermal imaging system. The thermal imager comprises a driving unit, a shell, a bracket arranged in the shell, a front fixed group fixedly connected to the front end face of the shell, an external interface arranged on the shell, a zoom group, a compensation group, a focusing group, a reflection group, a relay group, a detector protection window H, an optical filter I, a cold stop J and a core group, wherein the zoom group, the compensation group, the focusing group, the reflection group, the relay group, the detector protection window H, the optical filter I, the cold stop J and the core group are arranged through the bracket; the reflecting mirror group comprises two reflecting mirrors which are mutually perpendicular to each other to form a U-shaped light path, and the light path is turned by 180 degrees; the driving unit is used for driving the zoom group, the compensation group and the focusing group to move along the optical axis.
Description
Technical Field
The invention relates to an infrared thermal imaging technology, in particular to a large-caliber transmission type medium wave refrigeration infrared continuous zooming thermal imager which can be mounted on theodolite, a turntable and other equipment and is mainly used for searching, tracking and measuring.
Background
In recent years, continuous-zoom infrared thermal imaging systems have been widely used in many aspects, and related technologies have been rapidly developed. The continuous zooming thermal imager can realize large-view-field searching and small-view-field tracking, has good imaging effect in the zooming process, can not lose targets, and has the requirements and effects which cannot be met by the fixed-focus thermal imager and the multi-view-field thermal imager.
The widely required longer detection distance, higher detection sensitivity, higher resolution and longer range of action of thermal infrared imagers place higher demands on the imaging resolution of the system. At present, most of long-focal-length imaging systems are catadioptric systems or small-caliber transmission systems, wherein the focal length of the catadioptric systems can be long, but the size is large, the adjustment difficulty is high, and the energy loss in a central area is serious; the focal length of the small-caliber transmission type system can be longer, the structure is compact, the light transmission caliber is small, the energy detection capability is low, and the acting distance is relatively short.
Disclosure of Invention
The invention aims to solve the technical problems of larger size, high adjustment difficulty, serious energy loss in a central area, small light-transmitting aperture of a small-aperture transmission type system, low energy detection capability and relatively short acting distance of a refraction and reflection type system in the conventional continuous zooming infrared thermal imaging system, and provides a large-aperture transmission type medium wave refrigerating infrared continuous zooming thermal imager.
In order to solve the technical problems, the technical solution provided by the invention is as follows:
the large-caliber transmission type medium wave refrigerating infrared continuous zooming thermal imager is characterized in that:
the device comprises a shell, a bracket and a driving unit which are arranged in the shell, a front fixed group fixedly connected with the front end face of the shell, an external interface arranged on the shell, a zoom group, a compensation group, a focusing group, a reflection group, a relay group, a detector protection window H, an optical filter I, a cold stop J and a core group which are arranged through the bracket;
the movement set comprises a detector and a circuit board assembly and is used for completing imaging, image processing, image output and driving unit control;
the front fixed mirror in the front fixed group, the zoom mirror in the zoom group, the compensation mirror in the compensation group, the focusing mirror in the focusing group, the reflecting mirror in the reflecting group, the relay mirror in the relay group, the detector protection window H, the optical filter I, the cold stop J and the image plane K of the detector are sequentially arranged along the light path;
the circuit board assembly outputs an image outwards through an external interface;
the reflecting mirror group comprises two reflecting mirrors which are mutually perpendicular to each other to form a U-shaped light path, and the light path is turned by 180 degrees;
the driving unit comprises a zoom driving assembly, a compensation driving assembly and a focusing driving assembly, the zoom driving assembly, the compensation driving assembly and the focusing driving assembly are respectively used for driving the zoom group, the focusing group and the focusing group to move along an optical axis, the relative movement of the zoom group and the compensation group is used for realizing continuous zooming, and the movement of the focusing group is used for realizing high-low temperature image movement compensation.
Further, the front fixed mirror is a meniscus silicon positive lens A with a convex surface facing the object space, and is used for converging light rays;
the zoom lens is a biconcave negative germanium lens B and is used for changing focal length;
the compensating mirror is a biconvex positive silicon lens C and is used for compensating image shift caused in the zooming process;
the focusing lens is a negative germanium lens D with a concave surface facing the image space, and is used for completing the first imaging, and the purpose of high and low temperature compensation of the image surface is achieved through axial movement;
the relay group comprises 3 relay mirrors, namely a biconvex positive silicon lens E, a biconcave negative zinc sulfide lens F and a biconvex positive chalcogenide lens G which are sequentially arranged along a light path, and the relay mirrors are used for finishing diaphragm matching, performing secondary imaging and correcting residual aberration.
Further, the zoom driving assembly and the compensation driving assembly have the same structure and comprise a precise guide rail, a sliding block, a motor, a screw nut and a nut adapter; the motor is arranged on the bracket;
the screw rod and the output shaft of the motor are integrally arranged, the screw rod is fixed in the bracket through a bearing, and the screw rod nut is arranged on the screw rod;
the bottom of the sliding block is connected with a screw and a nut through the nut adapter, and the rotary motion of the motor is converted into linear motion of the sliding block;
the zoom group comprises a zoom lens frame, and a lens barrel and a zoom lens of the zoom lens which are arranged in the zoom lens frame; the zoom lens frame is fixed on a sliding block of the zoom driving assembly;
the compensation group comprises a compensation mirror frame and a lens barrel of the compensation mirror and the compensation mirror which are arranged in the compensation mirror frame; the compensation mirror frame is fixed on the sliding block of the compensation driving component.
Further, the focusing driving assembly comprises a cam cylinder, a large gear ring, a guide pin, a focusing motor, a focusing gear and a cam retainer ring;
the focusing group comprises a focusing mirror frame, a lens cone of the focusing mirror and the focusing mirror, wherein the lens cone of the focusing mirror and the focusing mirror are arranged in the focusing mirror frame, and two straight grooves which are parallel to an optical axis and symmetrical with the optical axis as a center are axially arranged on the outer wall of the focusing mirror frame and are used for limiting the rotation movement of the lens cone of the focusing mirror;
the cam cylinder and the large gear ring are sequentially sleeved on the periphery of the focusing mirror frame from inside to outside and are fixedly connected, the cam cylinder, the focusing mirror frame and the focusing mirror barrel are radially fixed through the guide pin, and two circumferential spiral curved grooves are formed in the inner wall of the cam cylinder to form a structure similar to a nut screw rod and used for controlling the focusing mirror barrel to move along the direction of the curved grooves;
the cam retainer ring is in threaded connection with the periphery of the focusing lens frame to axially position the cam cylinder;
the focusing gear is arranged on an output shaft of the focusing motor;
the focusing gear is meshed with the large gear ring, and the rotary motion of the focusing motor is converted into the linear motion of the focusing mirror frame.
Further, the total moving stroke of the variable-magnification driving component for driving the variable-magnification lens to move is 135.5mm.
Further, the total movement travel of the compensation driving assembly for driving the compensation mirror to move is 45.6mm.
Further, the incident surface of the zoom lens, the emergent surface of the compensation lens, the emergent surface of the focusing lens and the emergent surfaces of the 3 relay lenses are all even-order aspheric surfaces;
the incidence surface of the front fixed mirror is plated with a hard film;
the surface of the reflecting mirror is plated with a reflecting film;
the surfaces of the emergent surface of the front fixed mirror, the incident surface and the emergent surface of the zoom mirror, the incident surface and the emergent surface of the compensation mirror, the incident surface and the emergent surface of the focusing mirror, and the incident surface and the emergent surface of the 3 relay mirrors are plated with antireflection films.
Compared with the prior art, the invention has the following beneficial effects:
1. the large-caliber transmission type medium wave refrigerating infrared continuous zooming thermal imager provided by the invention adopts a secondary imaging continuous zooming system, and an optical system only adopting 7 lenses is obtained on the premise of meeting the imaging quality, the shortest focal length is less than or equal to 57mm, the longest focal length is more than or equal to 610mm, and the clear aperture is more than or equal to 305mm. The design in the optical system ensures 100% matching of the cold diaphragm, and reduces the energy loss of the light beam. The optical axis direction of the thermal imager is changed through the two plane reflectors to form a U-shaped light path, so that the length and the volume of the system can be effectively reduced; the F number of the continuous zooming thermal imager is 2.0, the focal length is more than or equal to 610mm, the light transmission caliber is more than or equal to 305mm, the light transmission quantity of the system is increased, the sensitivity is improved, the continuous zooming thermal imager has long focal length and large light transmission aperture, and the structure is compact while high resolution is realized; the working temperature is covered at-45 to +65℃.
2. The large-caliber transmission type medium wave refrigerating infrared continuous zooming thermal imager provided by the invention has the advantages that the zooming mode is simple, only two lenses participate in zooming, the movement load is small, the consistency of an optical axis is easy to ensure, the continuous zooming driving is realized by using a stepping motor to match with a lead screw (a screw rod) and a guide rail, meanwhile, the stability of a moving lens group is improved, and the optical axis offset in the zooming process is smaller than 0.04mrad.
3. The large-caliber transmission type medium wave refrigeration infrared continuous zooming thermal imager provided by the invention has the advantages that the number of lenses is small, only seven lenses are used, the machining and adjusting tolerance requirement is low, and the difficulty in machining and adjusting is small.
4. The large-caliber transmission type medium wave refrigerating infrared continuous zooming thermal imager provided by the invention uses conventional infrared materials, namely silicon, germanium, zinc sulfide and a chalcogenide material, and has low processing difficulty and low risk.
Drawings
FIG. 1 is a schematic diagram of a large-caliber transmission type medium wave refrigeration infrared continuous zooming thermal imager;
FIG. 2 is a schematic view of the lens position in the large caliber transmissive medium wave refrigeration infrared continuous zooming thermal imager of the present invention;
FIG. 3 is a schematic structural view of a zoom driving assembly, a compensation driving assembly and a focusing driving assembly in the large-caliber transmission type medium wave refrigeration infrared continuous zooming thermal imager;
FIG. 4 is a schematic view of the structure of a focusing driving assembly and a focusing group in the large-caliber transmission type medium wave refrigeration infrared continuous zooming thermal imager;
reference numerals illustrate:
1-front fixed group, 2-zoom group, 3-compensation group, 4-focusing group, 5-reflection group, 6-relay group, 7-core group, 11-shell and 12-support;
41-focusing mirror frame, 42-focusing mirror, 21-zooming mirror frame and 31-compensating mirror frame;
81-precision guide rails, 82-bearings, 83-motors, 84-screws, 85-screw nuts and 86-nut adapters;
91-cam cylinder, 92-large gear ring, 93-guide pin, 94-focusing motor, 95-focusing gear and 96-cam retainer ring.
Detailed Description
The invention is further described below with reference to the drawings and examples.
The invention relates to a large-caliber transmission type medium wave refrigerating infrared continuous zooming thermal imager, which comprises a shell 11, a bracket 12 and a driving unit which are arranged in the shell 11, a front fixed group 1 fixedly connected to the front end surface of the shell 11, an external interface arranged on the shell 11, a zoom group 2, a compensation group 3, a focusing group 4, a reflecting group 5, a relay group 6, a detector protection window H, an optical filter I, a cold stop J and a movement group 7 which are arranged through the bracket 12; the movement set 7 comprises a detector and a circuit board assembly and is used for completing imaging, image processing, image output and control of a driving unit, namely the movement set 7 is mainly used for realizing photoelectric signal conversion, converting optical signals into images, and performing image processing and image output; the front fixed mirror in the front fixed group 1, the zoom mirror in the zoom group 2, the compensation mirror in the compensation group 3, the focusing mirror 42 in the focusing group 4, the reflecting mirror in the reflecting group 5, the relay mirror in the relay group 6, the detector protection window H, the optical filter I, the cold stop J and the image plane K of the detector are sequentially arranged along the light path; the circuit board assembly outputs an image outwards through an external interface; the reflecting mirror group is positioned between the focusing group 4 and the relay group 6 and comprises two reflecting mirrors which are mutually perpendicular, namely a reflecting mirror M and a reflecting mirror N, so that a U-shaped light path is formed, and the light path is turned by 180 degrees; the driving unit comprises a zoom driving assembly, a compensation driving assembly and a focusing driving assembly, the zoom driving assembly, the compensation driving assembly and the focusing driving assembly are respectively used for driving the zoom group 2, the compensation group 3 and the focusing group 4 to move along an optical axis, the relative movement of the zoom group 2 and the compensation group 3 is used for realizing continuous zooming, in the continuous zooming thermal imager, the zoom group 2 and the compensation group 3 do relative continuous movement, the focal length continuously changes in the movement process, but the image plane position remains unchanged, and the movement of the focusing group 4 is used for realizing high-low temperature image movement compensation.
The front fixed mirror is a meniscus silicon positive lens A with a convex surface facing the object space and is used for converging light rays; the zoom lens is a biconcave negative germanium lens B and is used for changing the focal length of the continuous zoom lens; the compensating mirror is a biconvex positive silicon lens C and is used for compensating image shift caused in the zooming process; the focusing lens 42 is a negative germanium lens D with a concave surface facing the image space, and is used for completing the first imaging, and the purpose of high-low temperature compensation of the image surface is achieved by axial movement; the relay group 6 comprises 3 relay mirrors, which are respectively a biconvex positive silicon lens E, a biconcave negative zinc sulfide lens F and a biconvex positive chalcogenide lens G which are sequentially arranged along the light path, and are used for finishing diaphragm matching, performing secondary imaging and correcting residual aberration.
By adopting the structure of the invention, seven imaging components are sequentially arranged from the object side to the image side, namely a front fixed group 1, a zoom group 2, a compensation group 3, a focusing group 4, a reflection group 5, a relay group 6 and a core group 7, and light rays pass through five lens groups and reflecting mirror groups, pass through a detector protection window H, an optical filter I and a cold stop J and finally reach an image plane K of the core group 7.
The zoom driving assembly and the compensation driving assembly have the same structure and comprise a precise guide rail 81, a sliding block, a motor 83, a screw 84, a screw nut 85 and a nut adapter 86; the motor 83 is arranged on the bracket 12; the motor 83, the screw 84, the screw nut 85 and the nut adaptor 86 are all positioned below the variable-magnification group 2; the screw rod 84 is integrally arranged with the output shaft of the motor 83, the screw rod 84 is fixed in the bracket 12 through the bearing 82, and the screw nut 85 is arranged on the screw rod 84; the bottom of the sliding block is connected with a screw nut 85 through the nut adapter 86, and the rotary motion of the motor 83 is converted into linear motion of the sliding block; the zoom group 2 comprises a zoom lens frame 21, and a lens barrel and a zoom lens of the zoom lens arranged in the zoom lens frame 21; the zoom lens frame 21 is fixed on a sliding block of the zoom driving assembly, and the total moving stroke of the zoom driving assembly for driving the zoom lens to move is 135.5mm; the compensation group 3 comprises a compensation mirror frame 31, and a lens barrel and a compensation mirror of the compensation mirror arranged in the compensation mirror frame 31; the compensation mirror frame 31 is fixed on a sliding block of the compensation driving component, and the total movement travel of the compensation driving component for driving the compensation mirror to move is 45.6mm.
The focusing driving assembly comprises a cam barrel 91, a large gear ring 92, a guide pin 93, a focusing motor 94, a focusing gear 95 and a cam retainer ring 96; the focusing group 4 comprises a focusing mirror frame 41, a lens barrel of the focusing mirror 42 and the focusing mirror 42, wherein the lens barrel of the focusing mirror 42 and the focusing mirror 42 are arranged in the frame 41 of the focusing mirror 42, and two straight grooves which are parallel to the optical axis and symmetrical with the optical axis as a center are axially arranged on the outer wall of the focusing mirror frame 41 and are used for limiting the rotation movement of the lens barrel of the focusing mirror 42; the cam cylinder 91 and the large gear ring 92 are sequentially sleeved on the periphery of the focusing mirror frame 41 from inside to outside, the cam cylinder 91, the focusing mirror frame 41 and the focusing mirror 42 are radially fixed through the guide pin 93, two circumferential spiral curved grooves are formed in the inner wall of the cam cylinder 91, and a nut screw-like structure is formed for controlling the focusing mirror 42 to move along the direction of the curved grooves; the cam retainer ring 96 is fixedly connected with the periphery of the focusing mirror frame 41 by using screws, so that the cam cylinder 91 is axially positioned; the focusing gear 95 is arranged on the output shaft of the focusing motor 94; the focus gear 95 engages with the large ring gear 92 to convert the rotational movement of the focus motor 94 into the linear movement of the focus frame 41. That is, after the focusing gear 95 is meshed with the large gear ring 92, the rotational movement of the focusing motor 94 is converted into the rotational movement of the cam barrel 91, wherein the guide pins 93 disposed in the spiral curved groove on the cam barrel 91 and the straight groove of the focusing lens frame 41 can only drive the lens barrel of the focusing lens 42 to do a linear movement along the optical axis due to the restriction of the rotational movement along the optical axis by the straight groove.
The large-caliber transmission type medium wave refrigerating infrared continuous zooming thermal imager provided by the invention adopts a secondary imaging mode to reduce the caliber of the lens A and ensure 100% cold diaphragm efficiency, and the whole system adopts 7 lenses, so that the continuous change of focal length of 57-610 mm is satisfied, the light transmission caliber is more than or equal to 305mm, and the structure is simple and compact. Fig. 1 shows a thermal imager structure at a focal length of 610 mm.
The infrared movement group 7 mainly realizes photoelectric signal conversion, converts the optical signal into an image, and performs image processing and image output; the variable-magnification driving component mainly realizes driving control of the variable-magnification group 2 to move along the axial direction; the compensation driving component mainly drives and controls the compensation group 3 to move along the axial direction; the focusing driving assembly mainly realizes driving control of the focusing group 4 to move along the axial direction; the bracket 12 is used for supporting and fixing the internal component structure of the shell 11; the shell 11 supports the front fixing group 1 and the bracket 12, and simultaneously provides an external interface as a whole thermal imager main body.
In order to ensure that the exposed surface of the thermal imager is protected from wind and sand, the front surface of the lens A is coated with a hard film, the reflecting surface of the reflecting mirror is coated with a reflecting film in order to ensure high transmittance and reduce cold reflection, and the other surfaces (the emergent surface of the front fixed mirror, the incident surface and the emergent surface of the zoom mirror, the incident surface and the emergent surface of the compensation mirror, the incident surface and the emergent surface of the focusing mirror and the incident surface and the emergent surface of the 3 relay mirrors) are coated with antireflection films. Table 1 shows the optical structure parameters of 60mm/600 mm.
TABLE 1, 60mm/600mm optical Structure parameter Table
The aspherical surfaces mentioned in the above lenses are even aspherical surfaces, and the expressions are as follows:
where z is the distance sagittal height from the aspherical surface vertex when the aspherical surface is at a position of height r in the optical axis direction, c represents the vertex curvature of the surface, equal to the reciprocal of the aspherical surface curvature radius, c=1/r 0 K is the conic coefficient, k=0, α 2 、α 3 、α 4 、α 5 、α 6 Is a high-order non-ballFace factor.
Table 2 shows the aspherical coefficients of surfaces S4, S6, S7, S14:
table 2 table of aspherical coefficients
| Surface of the body | α 2 | α 3 | α 4 |
| S3 | 3.9939e-8 | -1.68348e-12 | 7.353607e-17 |
| S6 | 6.532857e-8 | -2.440704e-12 | 7.226834e-17 |
| S8 | 3.72096e-9 | 5.138704e-12 | 2.338759e-15 |
| S12 | 5.35368e-6 | 9.451688e-10 | -7.748325e-12 |
| S14 | -5.6457e-7 | -8.76021e-10 | -3.987897e-10 |
| S16 | 7.75523e-6 | -1.869445e-8 | 7.677986e-11 |
Finally, it should be noted that: the foregoing embodiments are merely for illustrating the technical solutions of the present invention, and not for limiting the same, and it will be apparent to those skilled in the art that modifications may be made to the specific technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, without departing from the spirit of the technical solutions protected by the present invention.
Claims (6)
1. The utility model provides a large-bore transmission type medium wave refrigeration infrared continuous zoom thermal imager which characterized in that:
the device comprises a shell (11), a bracket (12) and a driving unit which are arranged in the shell (11), a front fixed group fixedly connected to the front end surface of the shell (11), an external interface arranged on the shell (11), a zoom group (2), a compensation group (3), a focusing group (4), a reflecting group (5), a relay group (6), a detector protection window H, an optical filter I, a cold stop J and a movement group (7), wherein the zoom group (2), the compensation group (3), the focusing group (4), the reflecting group (5) and the relay group (6) are arranged on the bracket (12);
the movement set (7) comprises a detector and a circuit board assembly and is used for completing imaging, image processing, image output and driving unit control;
the front fixed mirror in the front fixed group, the zoom mirror in the zoom group (2), the compensation mirror in the compensation group (3), the focusing mirror (42) in the focusing group (4), the reflecting mirror in the reflecting group (5), the relay mirror in the relay group (6), the detector protection window H, the optical filter I, the cold stop J and the image plane K of the detector are sequentially arranged along the light path;
the circuit board assembly outputs an image outwards through an external interface;
the reflecting group (5) comprises two reflecting mirrors which are mutually perpendicular to form a U-shaped light path, and the light path is turned by 180 degrees;
the driving unit comprises a zoom driving assembly, a compensation driving assembly and a focusing driving assembly, and is used for driving the zoom group (2), the compensation group (3) and the focusing group (4) to move along an optical axis respectively, wherein the relative movement of the zoom group (2) and the compensation group (3) is used for realizing continuous zooming, and the movement of the focusing group (4) is used for realizing high-low temperature image motion compensation; the thermal imager comprises seven lenses;
the front fixed mirror is a meniscus positive silicon lens A with a convex surface facing the object space and is used for converging light rays;
the zoom lens is a biconcave negative germanium lens B and is used for changing focal length;
the compensating mirror is a biconvex positive silicon lens C and is used for compensating image shift caused in the zooming process;
the focusing lens (42) is a negative germanium lens D with a concave surface facing the image space, and is used for completing the first imaging, and the purpose of high and low temperature compensation of the image surface is achieved through axial movement;
the relay group (6) comprises 3 relay mirrors, namely a biconvex positive silicon lens E, a biconcave negative zinc sulfide lens F and a biconvex positive chalcogenide lens G which are sequentially arranged along a light path, and is used for finishing diaphragm matching, performing secondary imaging and correcting residual aberration;
the 60mm/600mm optical structure parameters are shown below:
2. the large-caliber transmission type medium wave refrigeration infrared continuous zooming thermal imager as claimed in claim 1, wherein:
the zoom driving assembly and the compensation driving assembly have the same structure and comprise a precise guide rail (81), a sliding block, a motor (83), a screw (84), a screw nut (85) and a nut adapter (86); the motor (83) is arranged on the bracket (12);
the screw (84) is integrally arranged with an output shaft of the motor (83), the screw (84) is fixed in the bracket (12) through a bearing (82), and a screw nut (85) is arranged on the screw (84);
the bottom of the sliding block is connected with a screw nut (85) through the nut adapter (86), and the rotary motion of the motor (83) is converted into linear motion of the sliding block;
the zoom group (2) comprises a zoom lens frame (21), and a lens barrel and a zoom lens of the zoom lens which are arranged in the zoom lens frame (21); the zoom lens frame (21) is fixed on a sliding block of the zoom driving assembly;
the compensation group (3) comprises a compensation mirror frame (31) and a lens barrel and a compensation mirror of the compensation mirror arranged in the compensation mirror frame (31); the compensating mirror frame (31) is fixed on a sliding block of the compensating driving component.
3. The large-caliber transmission type medium wave refrigeration infrared continuous zooming thermal imager as claimed in claim 2, wherein:
the focusing driving assembly comprises a cam cylinder (91), a large gear ring (92), a guide pin (93), a focusing motor (94), a focusing gear (95) and a cam check ring (96);
the focusing group (4) comprises a focusing lens frame (41), a lens barrel of the focusing lens (42) and the focusing lens (42), wherein the lens barrel of the focusing lens (42) and the focusing lens (42) are arranged in the focusing lens frame (41), two straight grooves which are parallel to the optical axis and symmetrical with the optical axis as a center are axially arranged on the outer wall of the focusing lens frame (41) and are used for limiting the rotation movement of the lens barrel of the focusing lens (42);
the cam cylinder (91) and the large gear ring (92) are sequentially sleeved on the periphery of the focusing mirror frame (41) from inside to outside, the cam cylinder (91), the focusing mirror frame (41) and the focusing mirror (42) lens barrel are radially fixed through the guide pin (93), two circumferential spiral curve grooves are formed in the inner wall of the cam cylinder (91), and a nut screw-like structure is formed for controlling the focusing mirror (42) lens barrel to move along the direction of the curve grooves;
the cam retainer ring (96) is fixedly connected with the periphery of the focusing mirror frame (41) to axially position the cam cylinder (91);
the focusing gear (95) is arranged on an output shaft of the focusing motor (94);
the focusing gear (95) is meshed with the large gear ring (92) to convert the rotary motion of the focusing motor (94) into the linear motion of the focusing mirror frame (41).
4. The large-caliber transmission type medium wave refrigeration infrared continuous zooming thermal imager as claimed in claim 3, wherein:
the total moving stroke of the variable-magnification driving component for driving the variable-magnification lens to move is 135.5mm.
5. The large-caliber transmission type medium wave refrigeration infrared continuous zooming thermal imager as claimed in claim 4, wherein:
the total movement travel of the compensation driving component for driving the compensation mirror to move is 45.6mm.
6. The large-caliber transmission type medium wave refrigeration infrared continuous zooming thermal imager as claimed in claim 5, wherein:
the incidence plane of the zoom lens, the emergent plane of the compensation lens, the emergent plane of the focusing lens and the emergent plane of the 3 relay lenses are all even aspheric surfaces;
the incidence surface of the front fixed mirror is plated with a hard film;
the surface of the reflecting mirror is plated with a reflecting film;
the surfaces of the emergent surface of the front fixed mirror, the incident surface and the emergent surface of the zoom mirror, the incident surface and the emergent surface of the compensation mirror, the incident surface and the emergent surface of the focusing mirror, and the incident surface and the emergent surface of the 3 relay mirrors are plated with antireflection films.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2338760Y (en) * | 1998-06-25 | 1999-09-15 | 中国科学院光电技术研究所 | Linkage varifocus objective |
| CN106054363A (en) * | 2016-07-26 | 2016-10-26 | 福建福光股份有限公司 | High zoom ratio medium wave infrared continuous zoom lens and its working method |
| CN209690587U (en) * | 2019-03-11 | 2019-11-26 | 中国科学院上海技术物理研究所 | Infrared continuous zoom lens zoom mechanism based on straight-line motion mechanism |
| CN213876152U (en) * | 2020-12-24 | 2021-08-03 | 西安中科立德红外科技有限公司 | Continuous zooming mechanism |
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2021
- 2021-10-26 CN CN202111247528.5A patent/CN113805324B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2338760Y (en) * | 1998-06-25 | 1999-09-15 | 中国科学院光电技术研究所 | Linkage varifocus objective |
| CN106054363A (en) * | 2016-07-26 | 2016-10-26 | 福建福光股份有限公司 | High zoom ratio medium wave infrared continuous zoom lens and its working method |
| CN209690587U (en) * | 2019-03-11 | 2019-11-26 | 中国科学院上海技术物理研究所 | Infrared continuous zoom lens zoom mechanism based on straight-line motion mechanism |
| CN213876152U (en) * | 2020-12-24 | 2021-08-03 | 西安中科立德红外科技有限公司 | Continuous zooming mechanism |
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