Image plane focusing mechanism used for push-broom type aero remote sensor

Abstract

The invention discloses an image plane focusing mechanism used for a push-broom type aero remote sensor, belonging to mechanical structure design of aerial photography technology. The focusing mechanism comprises a worm gear box assembly, a cam assembly, a roller assembly, a precision linear guide rail, a focal plane assembly and a sensor shell. The worm gear box assembly and the cam assembly are arranged on the sensor shell and are connected through a worm gear and a cam gear; the precision linear guide rail is arranged on the sensor shell; the focal plane assembly is arranged on the precision linear guide rail through a linear bearing; and the roller assembly is arranged on the focal plane assembly and is connected with a hyperbolic cam through a big roller and a small roller. Through forward-backward movement of a driving detector along an optical axis, a superposition of a receiving plane of a detector and a focal plane of an optics system is realized, thereby achieving the purpose of image plane focusing. The invention has the advantages of relative simple structure, sufficient strength and rigidness, and high motion accuracy and positional accuracy, wherein the motion accuracy of the focal plane assembly is not larger than 20 secconds, and the positional accuracy of the focal plane assembly is not larger than 0.02 mm.

Description

Technical field: [0001] The invention belongs to the technical field of aerial photography and relates to a mechanical structure design of an image plane focusing mechanism of an aerial remote sensor. Background technique: [0002] When the push-broom aerial remote sensor takes pictures in the air, different temperatures, atmospheric pressures and different shooting distances will cause the focal plane of the optical system to change. When the change of the optical focal plane is greater than the focal depth of the optical system, the detector’s When the receiving surface cannot change accordingly, the system will defocus, which will lead to the degradation of the photographic image quality of the aerial remote sensor, or even the failure of imaging. In order to ensure the imaging quality, a focusing mechanism must be designed so that the receiving surface of the detector coincides with the focal plane of the optical system. [0003] The usual focusing methods include lens ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the detector moves back and forth along the optical axis to achieve image plane focusing, a hyperbolic cam mechanism with stable transmission and high motion precision is invented to drive the detector to move to achieve focus adjustment

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