Method for reducing optical axis runout of zoom lens at high and low temperatures

Abstract

The invention belongs to the technical field of observation, and discloses a method for reducing an optical axis runout of a zoom lens at high and low temperatures. The method comprises the followingsteps: fitting a correlation curve between a focal length of the zoom lens and the number of rotation steps of a step motor; with a center of an optical axis on a long focus end of the zoom lens at aroom temperature as a reference, measuring corresponding optical axis runouts of the zoom lens via an optical instrument at multiple temperatures and multiple focal lengths; supposing that an offset has a linear change between adjacent temperatures and adjacent focal lengths, and calculating the offset at any temperature and focal length; and according to the number of steps rotated by the step motor, calculating a focal length value at a current position, detecting, in real time, a temperature at which the zoom lens is located, combining the focal length value and the temperature with an offset determination method to obtain offset data, and adjusting a position of an electronic collimation mark of the zoom lens according to the offset data, thus reducing the optical axis runout of the zoom lens. The method provided by the invention reduces the optical axis runout of the zoom lens in a full-temperature environment, so that the zoom lens may serve as a collimator for use.

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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