CN-121995594-A - Gap eliminating mechanism for deep space focusing assembly and pretightening force determining method

CN121995594ACN 121995594 ACN121995594 ACN 121995594ACN-121995594-A

Abstract

The invention belongs to the technical field of space cameras, and relates to a gap eliminating mechanism for a deep space focusing assembly and a pretightening force determining method. The clearance eliminating mechanism comprises a pressing sheet seat, the pressing sheet seat is fixed on the outer wall of the movable lens barrel of the deep space focusing assembly, a pressing sheet is arranged on the pressing sheet seat and is in contact with the inner wall of the main lens barrel of the deep space focusing assembly, a spring is arranged between the pressing sheet seat and the pressing sheet, the pressing sheet penetrates through the spring and the pressing sheet seat to be assembled with a nut for adjusting the pretightening force, the thermal vacuum environment is considered, the pretightening force variation range is controlled, the spring is elastically deformed to ensure that the pressing sheet is always in full contact with the main lens barrel, and the environmental adaptability of equipment is improved.

Inventors

Duan Zhexin
LI FU
YANG JIANFENG
LU DI
CHEN FEI
Lv juan
XUE BIN
YU JIRUI

Assignees

中国科学院西安光学精密机械研究所

Dates

Publication Date: 20260508
Application Date: 20260309

Claims (10)

1. A remove clearance mechanism for deep space focusing subassembly, a serial communication port, including preforming seat (8), preforming seat (8) are fixed at the removal lens cone (1) outer wall of deep space focusing subassembly, are provided with preforming (5) on preforming seat (8), and preforming (5) are contacted with the main lens barrel (2) inner wall of deep space focusing subassembly, are provided with spring (6) between preforming seat (8) and preforming (5), and preforming (5) pass spring (6) and preforming seat (8) and nut (7) assembly for adjust pretightning force.
2. The gap eliminating mechanism for the deep space focusing assembly according to claim 1, wherein the pressing piece (5) comprises a pressing surface and two connecting columns, the two connecting columns are fixedly arranged below the pressing surface, the pressing surface is in contact with the inner wall of the main lens barrel (2) of the deep space focusing assembly, threads are arranged on the two connecting columns, and the connecting columns penetrate through the spring (6) and the pressing piece seat (8) to be assembled with the nut (7).
3. A backlash mechanism for a deep-space focus assembly as claimed in claim 1, characterized in that the spring (6) is in a compressed state in the backlash mechanism, the compression of the spring (6) being greater than the maximum assembly clearance of the deep-space focus assembly.
4. A backlash mechanism for a deep-space focusing assembly according to claim 3, characterized in that the compression of the spring (6) satisfies the following formula: Wherein, the Is the compression amount of the spring; is the maximum assembly gap between the main lens barrel and the lens frame.
5. A backlash mechanism for a deep-space focus assembly as claimed in claim 1, characterized in that the spring (6) has a spring rate satisfying the following formula: Wherein, the Is spring rate; the quality of the glasses frame is that of the glasses frame; is the maximum disturbance angular frequency; Is a safety factor.
6. The deep space focusing assembly is characterized by comprising the gap eliminating mechanism (9) for the deep space focusing assembly, wherein the gap eliminating mechanism (9) is provided with three groups, and the three groups of gap eliminating mechanisms (9) are uniformly arranged along the circumferential direction of the movable lens barrel (1) to form symmetrical support.
7. The deep space focusing assembly according to claim 6, further comprising a cam (3) and a guide pin (4), wherein the movable lens barrel (1) is installed in an inner hole of the main lens barrel (2), three groups of clearance eliminating mechanisms (9) are uniformly arranged between the movable lens barrel (1) and the main lens barrel (2) along the circumferential direction of the movable lens barrel (1), the cam (3) is installed on the outer wall of the main lens barrel (2), a cam curve groove is formed in the outer wall of the main lens barrel (2), and the guide pin (4) penetrates through the cam curve groove and is fixed on the movable lens barrel (1).
8. A deep space focusing assembly according to claim 6, characterized in that the radial resultant force of the three sets of gap-eliminating mechanisms (9) satisfies the following condition: Wherein, the Radial resultant force of three groups of spring mechanisms; is the friction coefficient of the guide pair; Maximum thrust for the zoom driving mechanism; is a driving torque safety coefficient; Is the friction of the three groups of spring mechanisms.
9. The deep space focusing assembly according to claim 6, wherein the pretightening force of the three groups of gap eliminating mechanisms (9) does not change by more than +/-10% within a temperature range of-20 ℃ to +55 ℃.
10. A method for determining the pretightening force of a gap eliminating mechanism for a deep space focusing assembly according to any one of claims 1 to 5, wherein the gap eliminating mechanism (9) is provided with three groups in the deep space focusing assembly, and the pretightening force of the three groups of gap eliminating mechanisms is determined by the steps of: Acquiring kinematic pair material parameters, mirror frame quality, external maximum disturbance angular frequency, maximum thrust of a zooming driving mechanism, working environment temperature and initial design environment temperature in a deep space focusing assembly; Determining temperature change according to kinematic pair material parameters, mirror frame quality, external maximum disturbance angular frequency, maximum thrust of a zooming driving mechanism, working environment temperature and initial design environment temperature in a deep space focusing assembly The pre-tightening force provided by the spring: in the formula, For temperature change The pre-tightening force provided by the spring; is the temperature coefficient of shear modulus of the spring; Is spring rate; The thermal expansion coefficient of the main lens barrel and the lens frame is poor; is the free length of the spring; The radial resultant force provided for the three sets of spring mechanisms; is the friction coefficient of the guide pair; Maximum thrust for the zoom driving mechanism; is a driving torque safety coefficient; the quality of the glasses frame is that of the glasses frame; is the maximum disturbance angular frequency; Is a safety coefficient; Is the working environment temperature; Ambient temperature is initially designed.

Description

Gap eliminating mechanism for deep space focusing assembly and pretightening force determining method Technical Field The invention belongs to the technical field of space cameras, and relates to a gap eliminating mechanism for a deep space focusing assembly and a pretightening force determining method. Background In the zoom optical lens, a cam structure is generally adopted to realize the zoom function, during zooming, the outer cam rotates, the moving lens barrel is driven by the guide pin, and meanwhile, the moving lens barrel regularly performs linear motion along the cam curve, so that the image surface is kept unchanged while the focal length is changed. Cam-type zoom mechanisms are widely used in optical zoom lenses due to their simple and compact structure and easy-to-process adjustment. Focusing on deep space detection cam zoom mechanism, when ambient temperature changes, taking into account cold welding effect to and the kinematic pair uses different materials, coefficient of thermal expansion exists the difference, and kinematic pair clearance changes thereupon, and the picture frame easily takes place micro-slope and rocks, leads to optical axis skew and focus drift, thereby influences imaging quality and zoom repeatability. In the prior art, the axial length of the movable group lens barrel is prolonged, but the radial translation error is not reduced, and the problem of mass increase is caused by the length of the movable group, and the technical problem that the rolling guide rail mechanism is large in size and not suitable for a lightweight system exists. Disclosure of Invention The invention aims to provide a gap eliminating mechanism for a deep space focusing assembly and a pretightening force determining method, so as to solve the problems of gaps, optical axis shaking and thermal drift of a guide pair of a conventional deep space zooming camera. In order to achieve the purpose, the invention is realized by adopting the following technical scheme: In a first aspect, the application discloses a gap eliminating mechanism for a deep space focusing assembly, which comprises a pressing plate seat, wherein the pressing plate seat is fixed on the outer wall of a movable lens barrel of the deep space focusing assembly, a pressing plate is arranged on the pressing plate seat, the pressing plate is contacted with the inner wall of a main lens barrel of the deep space focusing assembly, a spring is arranged between the pressing plate seat and the pressing plate, and the pressing plate passes through the spring and the pressing plate seat to be assembled with a nut for adjusting pretightening force. Preferably, the pressing piece comprises a pressing surface and two connecting columns, the two connecting columns are fixedly arranged below the pressing surface, the pressing surface is in contact with the inner wall of the main lens barrel of the deep space focusing assembly, threads are formed on the two connecting columns, and the connecting columns penetrate through the spring and the pressing piece seat to be assembled with the nut. Preferably, the spring is in a compressed state in the clearance eliminating mechanism, and the compression amount of the spring is larger than the maximum assembly clearance of the deep space focusing assembly. Preferably, the compression amount of the spring satisfies the following formula: Wherein, the Is the compression amount of the spring; is the maximum assembly gap between the main lens barrel and the lens frame. Preferably, the spring rate of the spring satisfies the following formula: Wherein, the Is spring rate; the quality of the glasses frame is that of the glasses frame; is the maximum disturbance angular frequency; Is a safety factor. In a second aspect, the application discloses a deep space focusing assembly, which comprises any one of the gap eliminating mechanisms for the deep space focusing assembly, wherein the gap eliminating mechanisms are provided with three groups, and the three groups of gap eliminating mechanisms are uniformly arranged along the circumferential direction of a movable lens barrel to form symmetrical supports. The movable lens barrel is arranged in an inner hole of the main lens barrel, three groups of gap eliminating mechanisms are uniformly arranged between the movable lens barrel and the main lens barrel along the circumferential direction of the movable lens barrel, the cam is arranged on the outer wall of the main lens barrel, a cam curve groove is formed in the outer wall of the main lens barrel, and the guide nail penetrates through the cam curve groove and is fixed on the movable lens barrel. Preferably, the radial resultant force of the three sets of gap elimination mechanisms satisfies the following condition: Wherein, the Radial resultant force of three groups of spring mechanisms; is the friction coefficient of the guide pair; Maximum thrust for the zoom driving mechanism; is a driving torque safety coefficie