A combination mirror frame with thermal focusing function

Abstract

The invention discloses a combined mirror frame with thermal focusing function. The combined mirror frame adopts the method of combining two mirror frames, and three thermal focusing mechanisms are uniformly installed, and the temperature of the material is adjusted by means of active thermal control. , the adjustment amount is calculated by the concept of the linear expansion coefficient of the material. This method can not only make the lens move linearly along the optical axis, but also realize the adjustment of the lens at a certain angle. It does not require complicated mechanical parts and precise assembly requirements, and the structure is simple. Compact, optimized overall volume. In addition, two kinds of heaters are used to adjust at the same time, which can eliminate the influence of thermal control accuracy on the adjustment accuracy of the thermal focusing mechanism.

Description

technical field [0001] The invention relates to the technical field of space camera focus adjustment, in particular to a combined mirror frame with thermal focus function. Background technique [0002] In recent years, aerospace technology has developed very rapidly, and the application of space cameras has become more and more extensive. The core task of space cameras is to obtain and provide clear and complete images. However, when the space camera is launched and in orbit, it will be affected by the carrying conditions (such as shock, vibration, acceleration overload, etc.) and environmental conditions (such as pressure, temperature, microgravity, etc.). Different degrees of defocus, resulting in a decline in image quality. In order to ensure the imaging quality of the space camera and make the camera have good adaptability to changes in environmental factors, it is necessary to add a focusing mechanism to the camera system to correct this defocus, and the focusing amoun...

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Problems solved by technology

[0004] In addition, according to the principle of focusing, the focusing method can also be divided into mechanical focusing and thermal focusing. The mechanical focusing method usually uses a screw nut or a cam mechanism to convert the rotary motion of the motor into a linear motion, and then Accurate focusing is achieved through a series of deceleration mechanisms. The structure of the cam mechanism is relatively simple, and its impact resistance is strong. It is suitable for the movement direction conversion of the heavy-duty mechanism. The space requirements of the mechanism are also relatively large; although the screw nut mechanism has a simple structure and flexible movement, it has poor impact resistance, cumbersome assembly, and high assembly precision requirements.

[0005] At present, there are few studies on thermal focusing methods of cameras. This method refers to adjusting the temperature of structural components to indirectly achieve the purpose of adjusting the position of the focal plane, but the sensitivity and accuracy of focusing depend on temperature control and adjustment accuracy. Higher requirements are placed on the thermal control part of the camera

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