CN108073015B - High-precision linear focusing mechanism for space camera - Google Patents
High-precision linear focusing mechanism for space camera Download PDFInfo
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- CN108073015B CN108073015B CN201711296842.6A CN201711296842A CN108073015B CN 108073015 B CN108073015 B CN 108073015B CN 201711296842 A CN201711296842 A CN 201711296842A CN 108073015 B CN108073015 B CN 108073015B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
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Abstract
The utility model provides a high accuracy linear focusing mechanism for space camera, relates to space optical remote sensing technical field, solves among the prior art cam type focusing mechanism processing difficulty and the nonlinear problem of connecting rod type focusing mechanism focusing volume. The device comprises a focusing bracket, a focal plane assembly, a driving assembly and an encoder assembly; four linear guide rails are fixed on the focal plane assembly, each linear guide rail is provided with two sliding blocks which freely slide along the linear guide rail, the sliding blocks are fixedly connected with a sliding block mounting seat, and the sliding block mounting seat is connected with the focusing bracket through a sliding block trimming pad; drive assembly one end is fixed on the focusing support, and the other end is fixed on the focal plane subassembly, realizes through drive assembly that the focal plane subassembly slides on the guide rail slider relatively, realizes the adjustment of focal plane position, and the encoder subassembly is fixed on the focusing support, tests and feeds back through encoder focal plane position. The invention has the advantages of high focusing precision, easy processing and assembly, capability of linearly controlling focusing displacement, compact structure and the like.
Description
Technical Field
The invention relates to the technical field of space optical remote sensing, in particular to a high-precision linear focusing mechanism of a space camera.
Background
The space optical camera is different from a ground optical instrument, and can be subjected to harsh mechanical environments such as impact, vibration, overload and the like in the rocket launching process; in addition, the space camera is influenced by environmental conditions such as microgravity, high vacuum, temperature alternation and the like in an on-orbit working stage, and after the space camera is subjected to a series of severe environments, the interval between the primary mirror and the secondary mirror or the lens group can be changed, so that the optimal focal plane position deviates to a certain degree, and the imaging quality of the camera is directly influenced. In order to ensure the imaging quality of the space camera under the complex environmental conditions, the focal plane position of the space camera needs to be corrected, so that the camera can accurately image the target area on the photosensitive surface of the CMOS in the shooting process.
At present, a cam mechanism or a link mechanism is mostly adopted for a focusing mechanism of a domestic space camera for focusing, wherein the cam type focusing mechanism has higher processing requirement on a cam curve, and the link type focusing mechanism has a complex structure and nonlinear focusing amount and invisibly increases the difficulty of focusing control.
Disclosure of Invention
The invention provides a high-precision linear focusing mechanism of a space camera, which solves the problems of difficult processing of a cam type focusing mechanism and nonlinear focusing amount of a connecting rod type focusing mechanism in the prior art.
A high-precision linear focusing mechanism of a space camera comprises a focusing support, a focal plane assembly, a driving assembly and an encoder assembly; four linear guide rails are fixed on the focal plane assembly, each linear guide rail is provided with two sliding blocks which freely slide along the linear guide rail, the sliding blocks are fixedly connected with a sliding block mounting seat, and the sliding block mounting seat is fixedly connected with the focusing bracket through a sliding block trimming pad; drive assembly one end is fixed on the focusing support, and the other end is fixed on the focal plane subassembly, through drive assembly realizes that the focal plane subassembly slides relatively on guide rail slider, realizes the adjustment of focal plane position, the encoder subassembly is fixed on the focusing support, tests and feeds back through encoder focal plane position.
The invention has the beneficial effects that: the high-precision linear focusing mechanism of the space camera adopts a worm gear pair and a lead screw thread pair to convert the rotary motion of an output shaft of a stepping motor into the linear motion of a lead screw shaft, and the lead screw shaft directly drives a focal plane assembly to move so as to realize the adjustment of the focal plane position. The focusing mechanism has the advantages of high focusing precision, easiness in processing and assembling, capability of linearly controlling focusing displacement, compact structure and the like, and in addition, the mechanism also has a self-locking function and can fully ensure that the position of the best image quality is not changed.
Drawings
FIG. 1 is a front view of a high-precision linear focusing mechanism of a space camera according to the present invention;
FIG. 2 is a bottom view of a high-precision linear focusing mechanism of a space camera according to the present invention;
FIG. 3 is a front view of a high precision linear focusing mechanism driving assembly of a space camera according to the present invention;
FIG. 4 is a sectional view of a high-precision linear focusing mechanism driving assembly A-A of a space camera according to the present invention;
FIG. 5 is a cross-sectional view of an encoder assembly of a high-precision linear focusing mechanism of a space camera according to the present invention.
In the figure: 1. focusing support, 2, focal plane assembly, 3, driving assembly, 4, encoder assembly, 5, linear guide, 6, slider, 7, adjusting block, 8, slider mount, 9, slider finishing pad, 301, step motor, 302, step motor support, 303, coupling, 304, first angular contact bearing, 305, worm box, 306, worm, 307, first gear, 308, worm wheel shaft, 309, worm wheel, 310, key, 311, bearing block, 312, second angular contact bearing, 313, screw shaft, 401, encoder, 402, second gear, 403, bearing inner ring gland, 404, threaded clamping ring, 405, third gear, 406, third angular contact bearing. 407. A fourth gear 408, a gear fixing shaft 409 and an encoder bracket.
Detailed Description
First embodiment, the first embodiment is described with reference to fig. 1 to 5, and a high-precision linear focusing mechanism for a space camera includes a focusing frame 1, a focal plane assembly 2, a driving assembly 3, and an encoder assembly 4.
Four linear guide rails 5 are fixed on the focal plane assembly 2, each linear guide rail is provided with two sliding blocks 6 capable of freely sliding along the linear guide rail, the sliding blocks are fixedly connected with a sliding block mounting seat 8, and the sliding block mounting seat is fixedly connected with the focusing bracket 1 through a sliding block trimming pad 9; drive assembly 3 one end is fixed on focusing support 1, and the other end is fixed on focal plane subassembly 2, through drive assembly can realize that the focal plane subassembly slides relatively on the guide rail slider, and then realizes the adjustment of focal plane position, encoder subassembly 4 passes through encoder support 409 to be fixed on focusing support 1, can test and feed back the focal plane position through encoder 401.
The driving assembly 3 comprises a stepping motor 301, a stepping motor bracket 302, a coupler 303, a first angular contact bearing 304, a worm box 305, a worm 306, a first gear 307, a worm wheel shaft 308, a worm wheel 309, a key 310, a bearing seat 311, a second angular contact bearing 312 and a screw shaft 313. The stepping motor 301 is fixed on the focusing support 1 through a stepping motor support 302, an output shaft of the stepping motor is connected with a worm 306 through a coupler 303, the worm 306 and a worm wheel 309 are meshed, the worm wheel is fixedly connected with a worm wheel shaft 308 through a key 310, the worm wheel shaft is in threaded connection with a screw shaft 313, and a first gear 307 and the worm wheel shaft are fixedly connected through a positioning pin.
The worm 306 is connected with the worm box 305 through a first angular contact bearing 304, one end of the first angular contact bearing is limited through a worm shaft shoulder, and the other end of the first angular contact bearing is pressed tightly through a bearing cover; the worm case 305 is fixedly connected with the bearing seat 311 through a screw.
The worm gear shaft 308 is connected with the bearing seat 311 through a second angular contact bearing, one end of the second angular contact bearing 312 is limited through the worm gear shaft and a worm gear, and the other end of the second angular contact bearing is pressed tightly through a bearing cover.
The encoder assembly comprises an encoder 401, a second gear 402, a bearing inner ring gland 403, a threaded pressing ring 404, a third gear 405, a third angle contact bearing 406, a fourth gear 407, a gear fixing shaft 408 and an encoder bracket 409. The encoder 401 is fixed on the focusing support 1 through an encoder support 409, the second gear 402 is fixedly connected with the encoder 401 through a pin, the gear fixing shaft 408 is fixedly connected with the encoder support 409, the fourth gear 407 is connected with the gear fixing shaft 408 through a third angular contact bearing 406, one end of the third angular contact bearing is limited through the gear fixing shaft and the fourth gear, the other end of the third angular contact bearing is pressed through a threaded pressing ring 404 and a bearing inner ring pressing cover 40, the third gear 405 and the fourth gear 407 are connected in an interference fit mode and limited through two pins, a shaft end retaining ring is arranged on the fourth gear 407 and can prevent the third gear 405 from axially moving, the second gear 402 is meshed with the fourth gear 407, and the third gear is meshed with the first gear 307 in the driving assembly.
Be equipped with linear guide location shoulder and adjusting block 7 on the focal plane subassembly, the location shoulder is located linear guide's inboard, and adjusting block 7 sets up in linear guide's the outside, and the adjusting block can also play mechanical spacing's effect to whole focusing mechanism through restriction slider displacement in addition.
The structural member material is selected to reduce the weight as much as possible on the premise of ensuring the mechanical property, and the focusing support 1, the slide block mounting seat 8, the slide block trimming pad 9, the worm box 305, the stepping motor support 302, the bearing seat 311 and the encoder support 409 are made of aluminum alloy materials with better mechanical property and lower density; the worm 306 and the worm wheel shaft 308 of the transmission part are made of 40Cr materials with better wear resistance; the worm gear 309 is selected from tin bronze.
The above is a specific embodiment of the present invention, but the present invention is by no means limited thereto, and any modification or equivalent replacement made within the scope of the present invention is included in the scope of the present invention.
Claims (6)
1. The utility model provides a space camera high accuracy linear focusing mechanism, includes focusing support (1), focal plane subassembly (2), drive assembly (3) and encoder subassembly (4), characterized by:
four linear guide rails (5) are fixed on the focal plane assembly (2), each linear guide rail is provided with two sliding blocks (6) which freely slide along the linear guide rail, the sliding blocks (6) are fixedly connected with a sliding block mounting seat (8), and the sliding block mounting seat (8) is fixedly connected with the focusing support (1) through a sliding block trimming pad (9);
one end of the driving component (3) is fixed on the focusing support (1), the other end of the driving component is fixed on the focal plane component (2), relative sliding of the focal plane component (2) on the guide rail sliding block is realized through the driving component (3), adjustment of the position of a focal plane is realized, the encoder component (4) is fixed on the focusing support (1), and the position of the focal plane is tested and fed back through the encoder (401);
the driving assembly (3) comprises a stepping motor (301), a stepping motor bracket (302), a coupler (303), a first angular contact bearing (304), a worm box (305), a worm (306), a first gear (307), a worm wheel shaft (308), a worm wheel (309), a key (310), a bearing seat (311), a second angular contact bearing (312) and a screw shaft (313);
the focusing mechanism is characterized in that the stepping motor (301) is fixed on the focusing support (1) through a stepping motor support (302), an output shaft of the stepping motor is connected with a worm (306) through a coupler (303), the worm (306) is meshed with a worm wheel (309), the worm wheel is fixedly connected with a worm wheel shaft (308) through a key (310), the worm wheel shaft (308) is connected with a screw shaft (313) through threads, and a first gear (307) is fixedly connected with the worm wheel shaft (308) through a positioning pin;
the worm (306) is connected with the worm box (305) through a first angular contact bearing (304), one end of the first angular contact bearing (304) is limited through a worm shaft shoulder, and the other end of the first angular contact bearing is pressed tightly through a bearing cover; the worm box (305) is fixedly connected with the bearing seat (311) through a screw;
the worm wheel shaft (308) is connected with the bearing seat (311) through a second angular contact bearing (312), one end of the second angular contact bearing (312) is limited through the worm wheel shaft (308) and a worm wheel, and the other end of the second angular contact bearing (312) is pressed tightly through a bearing cover.
2. A high precision linear focusing mechanism for a space camera according to claim 1, characterized in that: the encoder assembly (4) comprises an encoder (401), a second gear (402), a bearing inner ring gland (403), a threaded pressing ring (404), a third gear (405), a third angle contact bearing (406), a fourth gear (407), a gear fixing shaft (408) and an encoder support (409);
the encoder (401) is fixed on the focusing support (1) through an encoder support (409), the second gear (402) is fixedly connected with the encoder (401) through a pin, the gear fixing shaft (408) is fixedly connected with the encoder bracket (409), the fourth gear (407) is connected with the gear fixing shaft (408) through a third angular contact bearing (406), one end of the third contact bearing (406) is limited by a gear fixing shaft and a fourth gear (407), the other end is pressed by a thread pressing ring (404) and a bearing inner ring gland (403), the third gear (405) is connected with the fourth gear (407) in an interference fit way, and two pins are adopted for limiting, a shaft end retainer ring is arranged on a fourth gear (407), the second gear (402) is meshed with the fourth gear (407), and a third gear (405) is meshed with a first gear (307) in the driving assembly.
3. A high precision linear focusing mechanism for a space camera according to claim 1, characterized in that: be equipped with linear guide location on focal plane subassembly (2) and lean on shoulder and adjusting block (7), the location is leaned on the shoulder to be located linear guide's inboard, and adjusting block (7) set up in linear guide's the outside, and adjusting block (7) remove the displacement through the restriction slider and play mechanical spacing effect to focusing mechanism.
4. A high precision linear focusing mechanism for a space camera according to claim 1, characterized in that: the focusing support (1), the slider mounting seat (8) and the slider trimming pad (9) are made of aluminum alloy materials.
5. A high precision linear focusing mechanism for a space camera according to claim 1, characterized in that: the worm box (305), the stepping motor bracket (302) and the bearing seat (311) are made of aluminum alloy materials, and the worm (301) and the worm wheel shaft (308) are made of 40Cr materials; the worm wheel (309) is made of tin bronze.
6. A high precision linear focusing mechanism for a space camera according to claim 2, characterized in that: the encoder bracket (409) is made of aluminum alloy material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711296842.6A CN108073015B (en) | 2017-12-08 | 2017-12-08 | High-precision linear focusing mechanism for space camera |
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| CN201711296842.6A CN108073015B (en) | 2017-12-08 | 2017-12-08 | High-precision linear focusing mechanism for space camera |
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| CN108073015A CN108073015A (en) | 2018-05-25 |
| CN108073015B true CN108073015B (en) | 2020-03-13 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108681024B (en) * | 2018-06-08 | 2023-12-08 | 中国科学院西安光学精密机械研究所 | Moving target surface focusing mechanism and target surface inclination amount and visual axis runout detection method thereof |
| CN110488485B (en) * | 2019-07-16 | 2020-08-04 | 哈尔滨新光光电科技股份有限公司 | Two-dimensional coupling optical swing mirror device based on steel belt transmission |
| CN112099185B (en) * | 2020-08-28 | 2022-07-29 | 北京空间机电研究所 | Precision focusing device for optical component |
| CN112099288B (en) * | 2020-09-30 | 2021-08-24 | 长光卫星技术有限公司 | Space camera focusing mechanism applied to conjugated double focal planes |
| CN113900318A (en) * | 2021-11-16 | 2022-01-07 | 中国科学院长春光学精密机械与物理研究所 | Compact focusing mechanism of space camera |
| CN114740584B (en) * | 2022-04-15 | 2024-02-27 | 中国科学院上海技术物理研究所 | Focusing device for space deep low-temperature optical remote sensing instrument |
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