Large-focal-length front slit objective lens for aerospace application

Abstract

The invention discloses a large-focal-length front slit objective lens for aerospace application. The objective lens comprises a front lens barrel I and a front lens barrel II. The objective lens has the advantages that: 1) a front lens is provided with a light shield, and a heat insulation pad is arranged between the light shield and the front lens, so that the heat of the light shield is prevented from being transferred to the lens to influence the imaging quality of the lens; and 2) the longer the focal length of the front lens is, the longer the overall size of the lens group is, a front lens barrel straight opening and a rear lens barrel straight opening are designed to be matched to replace one lens barrel, and the problem that when a centering machining lathe machines a lens barrel with the length larger than 300 mm, due to the fact that a tool bit cantilever is too long, the tool shaking phenomenon occurs, and then the centering machining precision is affected can be solved; and 3) a metal copper pad and a rubber pad are arranged between a pressing ring and a single lens, so that a pressing ring metal piece can be prevented from being in direct contact with a glass optical element, a certain buffering capacity in the axial direction is ensured, and redundant stress caused by temperature change or a severe mechanical environment is released.

Description

technical field [0001] The invention relates to the field of precision optical instruments, in particular to a large focal length front slit objective lens for aerospace complex force / thermal environment applications. Background technique [0002] Aerospace products will withstand complex mechanical and thermal environments such as vibration, shock, high and low temperature cycles during launch. Therefore, compared with ground products, optical lenses for aerospace applications have higher environmental adaptability requirements. The traditional idea of ​​optical lens design and assembly is to apply 3M glue around the circumference of the single lens, then put it into the frame, and directly press the lens through the pressure ring to fix it. However, lenses for aerospace need to withstand complex mechanical and thermal environments, so it is necessary to set a buffer link between the pressure ring and the lens to release excess stress caused by temperature changes or harsh...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the above technical problems and provide a large focal length front slit objective lens for aerospace applications. By setting two lens barrels with straight openings to cooperate with each other, it is difficult to process lenses longer than 350mm in centering processing. To solve the barrel problem, add metal pads and rubber pads between the pressure ring and the single lens, and set up buffer links to avoid direct contact between the metal parts of the pressure ring and the glass optical elements

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