Passive temperature compensation mechanism for optical instrument

Abstract

The invention provides a passive temperature compensation mechanism for an optical instrument, relating to a mechanism in the technical field of precise optical mechanical system design. The passive temperature compensation mechanism for an optical instrument in the invention comprises a clamping ring, a first lens, a first space ring, a second space ring, a second lens and a lens seat. The optical axis in the lens seat is sequentially provided with the second lens, the second space ring, the first space ring, the first lens and the clamping ring from right to left; the right side of the second space ring is contacted with the left side of the second lens, a convex ring at the right side of the first space ring is put in a concave ring at the left side of the second space ring, the convex ring surface of the convex ring is contacted with the concave ring surface of the concave ring, the right side of the first lens is contacted with the left side of the first space ring, the first lens is clamped by the right surface of the clamping ring, and the edge of the clamping ring and the inner diameter of the lens seat are in thread contact to form a differential unit structure. The passive temperature compensation mechanism is simple in structure and is easy to realize, and good using effect is obtained when the mechanism is applied to an optical instrument used for aerial reconnaissance.

Description

technical field [0001] The invention belongs to a passive temperature compensation mechanism involved in the technical field of precision optical instrument design, in particular to a passive temperature compensation mechanism for an optical instrument used in aerial reconnaissance. Background technique [0002] The opto-mechanical system design of an optical instrument is a process that closely integrates various disciplines and technologies. The primary task of opto-mechanical engineers is to fix all the optical components in the optical system in their proper positions, and keep them at the required temperature and pressure. , vibration and other environmental conditions to maintain a certain position accuracy and surface accuracy, so that the optical system can work normally. [0003] For optical instruments used in aerial reconnaissance, the working temperature conditions are very harsh, and the imaging quality of the optical system will be degraded when the temperature...

AI Technical Summary

Problems solved by technology

This structure is a relatively common fixed structure for optical components in optical instruments. The biggest disadvantage of this design is that it does not consider temperature compensation.

Since the thermal expansion coefficient of the lens base is generally greater than that of the optical element, when the temperature rises, the expansion of the lens base 5 is larger than that of the pressure ring 1, the first lens 2, the spacer 3, and the second lens 4 at the same length. The combined expansion is large, which will produce an axial gap, which cannot be controlled. When the temperature range is large, this axial gap will cause the preload applied by the pressure ring 1 to the first lens 2 to disappear. If the optical instrument is in a vibration and impact environment, it may cause the lens to move freely, which will affect the imaging quality of the optical system

When the temperature is lowered, similarly, the shrinkage of the mirror holder 5 is greater than the combined shrinkage of the pressure ring 1, the first lens 2, the spacer 3, and the second lens 4. In this case, the lens and the spacer will be squeezed , when the temperature range is large, a large axial stress will be generated at the surface of the lens curvature, resulting in a decrease in the surface shape accuracy of the optical parts, resulting in a decrease in imaging quality

In short, no matter the temperature rises or falls, the performance of optical instruments using this optical structure cannot be guaranteed

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