A Method for Reducing Optical Axis Jump of Zoom Lens under High and Low Temperature

Abstract

The invention belongs to the technical field of sighting and aiming, and discloses a method for reducing the jumping amount of the optical axis of a zoom lens at high and low temperatures, comprising the following steps: fitting the correlation curve between the focal length of the zoom lens and the number of rotation steps of a stepping motor; The center of the optical axis at the telephoto end is used as the reference, and the corresponding optical axis runout of the zoom lens at multiple temperatures and multiple focal lengths is measured by optical instruments; assuming that the offset changes linearly between adjacent temperatures and between adjacent focal lengths, Calculate the offset at any temperature and focal length: Calculate the focal length value at the current position according to the number of steps the stepping motor rotates, detect the temperature of the zoom lens in real time, and combine the focal length value and temperature with the offset measurement method to obtain the offset value The displacement data is used to adjust the position of the electronic aiming mark of the zoom lens according to the displacement data, so as to reduce the jumping amount of the optical axis of the zoom lens. The invention reduces the jumping amount of the optical axis of the zoom lens in all temperature environments, so that the zoom lens can be used as aiming.

Description

technical field [0001] The invention belongs to the technical field of sighting and sighting, and in particular relates to a method for reducing the jumping amount of the optical axis of a zoom lens under high and low temperature conditions. Background technique [0002] With the improvement of processing means and technical level, the use of zoom lenses in various products is becoming more and more common, and the electronic aiming mark generator is becoming more and more mature, which can be integrated into CCD or CMOS driver board. However, due to the existence of the optical axis jump, the zoom lens cannot be aimed and shot under high and low temperature conditions and during the full zoom process. Therefore, in many cases, the zoom lens can only be used for observation, and it is difficult to use it for aiming. At present, multiple lenses are used to switch the field of view, which increases the volume of the photoelectric system. With the increasing automation of wea...

AI Technical Summary

Problems solved by technology

However, due to the existence of optical axis jump, the zoom lens cannot aim and shoot under high and low temperature conditions and during the full zoom process.

Therefore, in many cases, the zoom lens can only be used for observation, and it is difficult to use it for aiming

At this stage, multiple lenses are used to switch the field of view, which increases the volume of the photoelectric system

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