Primary mirror floating support mechanism with positioning film
A floating support and support mechanism technology, applied in installation, optics, instruments, etc., can solve problems such as deformation of the main mirror surface, large difference in expansion coefficient, and reduced surface accuracy.
Inactive Publication Date: 2013-11-20
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
[0008] In order to solve the problem that the existing primary mirror support mechanism and the primary mirror are rigidly connected, and the expansion coefficients of the two are quite different, so the primary mirror support mechanism will transmit thermal stress deformation to the primary mirror, resulting in deformation of the primary mirror surface and a decrease in surface shape accuracy Technical problem, the present invention provides a primary mirror floating support mechanism with a positioning film
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[0027] The material of the mandrel 2 and the bottom plate 7 is Invar, and the expansion coefficient of Invar is 0.1×10 -6 / °C, the primary mirror is made of glass-ceramics, and the expansion coefficient is 0.05×10 -6 / °C, the material of the cross 13 is 16Mn. The materials of positioning film 9 and Belleville spring 11 are 65Mn. The material of the pin shaft 10 and the second screw 5 is No. 45 steel. Among them, the expansion coefficients of 16Mn, 65Mn and 45 steel are all 11×10 -6 / °C.
[0028] The gap between the positioning film annular boss 9-2 and the four-way round table 13-2 is 0.01mm-0.03mm. The matching gap between the annular boss 7-3 and the primary mirror mounting hole 13-1-1 is 1 mm. The matching gap between pin shaft 10 and through hole 7-4-1 is 1mm. The pretightening pressure of the belleville spring 11 on the base plate 7 is 800N.
[0029] Because a kind of main mirror floating support mechanism with positioning film of the present invention is assembled...
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The invention provides a primary mirror floating support mechanism with a positioning film and belongs to the field of primary mirror support structure of photoelectric instruments. The primary mirror floating support mechanism comprises a mandrel, a second screw, a bottom plate, the positioning film, a pin roll, a disc spring and a four-way joint, wherein the bottom plate is in an annular structure and comprises an annular boss, an annular support boss, a bottom plate central groove and a bottom plate substrate flange; a through hole is arranged in the bottom plate substrate flange, the positioning film is annular, a positioning film central groove is arranged on the inner diameter edge of the positioning film, and a positioning film annular boss is arranged on the outer diameter edge of the positioning film; the four-way joint comprises a primary mirror mounting base and a four-way round table; and a primary mirror mounting hole is formed in the primary mirror mounting base. When the ambient temperature changes, the relative slip between the four-way joint and the bottom plate is caused by the relative extension or contraction deformation quality formed between the four-way joint and the bottom plate, the positioning film central groove can absorb stress through self deformation, the stress is prevented from being transferred to the bottom plate, so that the heat stress between the bottom plate and the four-way joint is released, and the shape of the mirror surface cannot be affected by the temperature change.
Description
technical field [0001] The invention belongs to the field of photoelectric instrument main mirror support structure, and in particular relates to a main mirror floating support mechanism with a positioning film. Background technique [0002] As an important part of the optoelectronic instrument, the primary mirror determines the imaging quality of the optoelectronic system. The supporting structure of the primary mirror needs to reduce the influence of gravity and stress on the surface shape of the primary mirror while effectively positioning the primary mirror. In practical applications, in addition to requiring the primary mirror support mechanism to have sufficient support rigidity to ensure the position accuracy of the primary mirror, it is also required that the primary mirror support mechanism and the primary mirror have similar thermal expansion coefficients, which can effectively reduce the contact between the support mechanism and the primary mirror when the tempera...
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IPC IPC(8): G02B7/192
Inventor 薛向尧高云国
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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