Search

CN-121995617-A - Miniaturized laser communication coarse pointing mechanism

CN121995617ACN 121995617 ACN121995617 ACN 121995617ACN-121995617-A

Abstract

The invention discloses a miniaturized laser communication coarse pointing mechanism, and belongs to the technical field of space laser communication. The invention comprises a pitching shaft system, a single-pendulum mirror assembly, an azimuth shaft system and a telescope assembly, wherein the single-pendulum mirror assembly is arranged on a U-shaped frame of the pitching shaft system, the pitching shaft system is arranged on a main shaft of the azimuth shaft system, the single-pendulum mirror assembly is driven to rotate by a motor acceleration-deceleration device, the azimuth shaft system is arranged on an azimuth base, a gap eliminating gear is driven by a motor to drive the shaft system to rotate, the telescope assembly is arranged in the azimuth shaft system, and signal light enters and exits a coarse pointing mechanism through the deflection of the single-pendulum mirror assembly, the beam expansion and the beam contraction of the telescope assembly. The miniaturized laser communication coarse pointing mechanism provided by the invention has the advantages of small volume, light weight, simplicity in assembly and adjustment and the like, effectively solves the problems of complex structure, large size and weight, high emission cost and the like of the traditional laser communication terminal, and provides a thinking for the light miniaturization of the laser communication terminal.

Inventors

  • LIU DONGSHUAI
  • ZHU CHENGWEI
  • LI XU
  • ZHAO YONG
  • YANG CHUNLEI

Assignees

  • 之江实验室

Dates

Publication Date
20260508
Application Date
20260409

Claims (10)

  1. 1. The miniaturized laser communication coarse pointing mechanism is characterized by comprising a pitching shaft system (1), a single-swing mirror assembly (2), an azimuth shaft system (3) and a telescope assembly (4); the pitching shaft system (1) comprises a U-shaped frame (13), wherein a fixed shaft (11) and a swimming shaft (12) are respectively arranged at two ends of the U-shaped frame (13), the swimming shaft (12) is connected with a pitching motor (112) through a speed reducer (113) to drive the U-shaped frame (13) to perform pitching motion, and an optical filter (118) is arranged at the bottom end of the U-shaped frame (13); The single-pendulum mirror assembly (2) is arranged on the U-shaped frame (13), the single-pendulum mirror assembly (2) is driven to perform pitching motion through the U-shaped frame (13), and the single-pendulum mirror assembly (2) is used for realizing the turning in and out of signal light; The azimuth shafting (3) comprises an azimuth shaft (31), an azimuth internal gear (36), an azimuth external gear (37) and an azimuth motor (38), wherein the upper end of the azimuth shaft (31) is fixedly connected with the U-shaped frame (13), and the lower end of the azimuth shaft is fixedly connected with the azimuth internal gear (36), the azimuth motor (38) drives the azimuth internal gear (36) to rotate through the azimuth external gear (37) so as to drive the azimuth shaft (31) to rotate, and drives the single-pendulum mirror assembly (2) to rotate in azimuth through the U-shaped frame (13); The telescope assembly (4) is arranged on the base of the azimuth shafting (3), and the telescope assembly (4) is used for realizing beam expansion and beam contraction of signal light.
  2. 2. The miniaturized laser communication coarse pointing mechanism according to claim 1, wherein the fixed shaft (11) and the movable shaft (12) are respectively arranged on the U-shaped frame (13) through a pair of angle contact ball bearings (14), the fixed shaft (11) is fixed through an outer pressing ring (15), an inner pressing ring (16) and a pitching encoder code disc seat (17), an encoder reading head support (19) is arranged on the outer side, an encoder code disc (18) is arranged on the pitching encoder code disc seat (17) and is matched with an encoder reading head arranged on the encoder reading head support (19), and a pitching outer shell (111) is arranged on the outermost side of the fixed shaft (11) and used for protecting the encoder code disc (18) and the encoder reading head.
  3. 3. The miniaturized laser communication coarse pointing mechanism according to claim 2, wherein the single-swing mirror assembly (2) comprises a swing mirror (21), a swing mirror bushing (22) and a swing mirror back plate (23), the swing mirror (21) is fixedly connected with the swing mirror back plate (23) through the swing mirror bushing (22), the swing mirror bushing (22) is provided with a flexible structure, and the swing mirror (21) adopts an eccentric structure.
  4. 4. A miniaturized laser communication coarse pointing mechanism according to claim 3, characterized in that the azimuth axis (3) comprises an azimuth bearing (32), an azimuth base (33), an azimuth encoder (39), a reference prism (313) and a reference prism seat (314), the azimuth axis (31) is fixed on the azimuth base (33) through the azimuth bearing (32), the azimuth encoder (39) is mounted on a groove arranged on the azimuth axis (31), and the reference prism (313) is mounted on the azimuth base (33) through the reference prism seat (314).
  5. 5. The miniaturized laser communication coarse pointing mechanism according to any one of claims 1-4, wherein the telescope assembly (4) comprises a primary mirror (41), a secondary mirror (42), a secondary mirror support (43), a trimming spacer (44), a reflecting mirror (45) and a telescope base (46), wherein the secondary mirror (42) is mounted above the primary mirror (41) through the secondary mirror support (43), the focal length between the primary mirror (41) and the secondary mirror (42) is adjusted through the trimming spacer (44), the reflecting mirror (45) is mounted on the primary mirror (41), and the primary mirror (41), the secondary mirror (42) and the reflecting mirror (45) are coaxially mounted on the telescope base (46).
  6. 6. The miniaturized laser communication coarse pointing mechanism according to claim 5, wherein the pitching motor (112) is fixedly connected with the speed reducer (113) through a motor mounting seat (114), the speed reducer (113) is connected with the traveling shaft (12) through a flange (115), and the U-shaped frame (13) is provided with a limit column (116) for controlling the rotation range of the U-shaped frame (13).
  7. 7. The miniaturized laser communication coarse pointing mechanism according to claim 6, wherein the optical filter (118) is fixed at the bottom end of the U-shaped frame (13) through an optical filter base (119), and the bottom end of the U-shaped frame (13) is further provided with an electric wire cover plate (117).
  8. 8. The miniaturized laser communication coarse pointing mechanism according to claim 7, characterized in that the azimuth bearing (32) is a four-point contact ball bearing, the inner ring of the four-point contact ball bearing is mounted on the azimuth shaft (31) through a bearing inner pressing ring (34), and the outer ring is mounted on the azimuth base (33) through a bearing outer pressing ring (35) for enabling the azimuth shaft system (3) to bear radial load and axial load.
  9. 9. The miniaturized laser communication coarse pointing mechanism according to claim 8, wherein the azimuth external gear (37) comprises a driving gear (371), a torsion spring (372) and a driven gear (373), the driving gear (371) is mounted on a main shaft of the azimuth motor (38), the driven gear (373) is connected with the driving gear (371) through the torsion spring (372), tooth surfaces of the driving gear (371) and the driven gear (373) are staggered through the pre-pressing torsion spring (372), tooth surfaces of the driving gear (371) and the driven gear (373) are respectively attached to tooth surfaces of an internal gear (36), and gear transmission gaps are eliminated.
  10. 10. The miniaturized laser communication coarse pointing mechanism according to claim 9, wherein the azimuth axis system (3) further comprises an azimuth cover plate (311), a wire arranging disc (312), a polishing pad (315) and an adapter flange (316), the azimuth cover plate (311) is fixed on the azimuth base (33) and used for protecting the azimuth encoder (39), the wire arranging disc (312) is mounted on the azimuth base (33) and used for storing wires of the pitching axis system (1), the azimuth base (33) is fixed on the adapter flange (316), and the positions of the azimuth cover plate (311) and the angle adjusting disc are adjusted through the polishing pad (315).

Description

Miniaturized laser communication coarse pointing mechanism Technical Field The invention relates to the technical field of space laser communication, in particular to a laser communication coarse pointing mechanism which is compact in structure, small in size and light in weight, and particularly relates to a miniaturized laser communication coarse pointing mechanism. Background With the development of optical communication technology, the laser communication technology has been applied to the space field, and the laser communication machine uses laser as an information carrier, so that high-speed and stable data transmission can be realized. The laser communication machine is the basis of networking communication and constellation construction among satellites, along with the application of an on-orbit high-definition imaging and tracking system, the demand of the laser communication machine is increased in geometric progression, and development and emission with low cost are necessary requirements, so that the miniaturization and light weight design are necessary trends, the existing laser communication terminal has a complex structure, high installation and adjustment difficulty, and simultaneously, the weight and the volume are relatively large, and the miniaturization and batch requirements are difficult to achieve. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a miniaturized laser communication coarse pointing mechanism which meets the miniaturization requirement of a laser communication terminal. The invention aims at realizing the technical scheme that the miniaturized laser communication coarse pointing mechanism comprises a pitching axis system, a single-swing mirror assembly, an azimuth axis system and a telescope assembly; The pitching shaft system comprises a U-shaped frame, wherein a fixed shaft and a swimming shaft are respectively arranged at two ends of the U-shaped frame, a structure with one fixed end and one swimming end is adopted, the swimming shaft is connected with a pitching motor through a speed reducer so as to drive the U-shaped frame to perform pitching motion, and the influence caused by micro-shaking of a swinging mirror in the optical communication process is effectively reduced through the cooperation of the speed reducer; The single-pendulum mirror assembly is arranged on the U-shaped frame, the single-pendulum mirror assembly is driven to perform pitching motion through the U-shaped frame, and the single-pendulum mirror assembly is used for realizing signal light turning in and out of the laser communication machine; The azimuth shaft system comprises an azimuth shaft, an azimuth internal gear, an azimuth external gear and an azimuth motor, wherein the upper end of the azimuth shaft is fixedly connected with the U-shaped frame, and the lower end of the azimuth shaft is fixedly connected with the azimuth internal gear; The telescope assembly is arranged on the base of the azimuth shafting and is used for realizing beam expansion and beam contraction of the signal light. Further, the fixed shaft and the moving shaft are respectively arranged on the U-shaped frame through a pair of angle contact ball bearings, the fixed shaft is fixed through an outer pressing ring, an inner pressing ring and a pitching encoder code disc seat, an encoder reading head support is arranged on the outer side of the fixed shaft, an encoder code disc is arranged on the pitching encoder code disc seat and is matched with an encoder reading head arranged on the encoder reading head support for use, and a pitching shell is arranged on the outermost side of the fixed shaft and used for protecting the encoder code disc and the encoder reading head. The single-swing mirror assembly comprises a swing mirror, a swing mirror bushing and a swing mirror back plate, wherein the swing mirror is fixedly connected with the swing mirror back plate through the swing mirror bushing, the swing mirror bushing is provided with a flexible structure, thermal stress generated by temperature change is prevented from affecting the surface type precision of the swing mirror, and the swing mirror adopts an eccentric structure so as to reduce the elevation of a pitching shaft system. The azimuth shaft system comprises an azimuth bearing, an azimuth base, an azimuth encoder, a reference prism and a reference prism seat, wherein the azimuth shaft is fixed on the azimuth base through the azimuth bearing, the azimuth encoder is arranged in a groove arranged on the azimuth shaft, and the reference prism is arranged on the azimuth base through the reference prism seat. The telescope assembly comprises a primary mirror, a secondary mirror support, a trimming gasket, a reflecting mirror and a telescope base, wherein the volume and the weight of the coarse pointing mechanism are greatly reduced by the miniaturized configuration of the telescope assembly, the secondary mirror is arranged a