Lens rapid switching device and zoom lens provided with device

Abstract

The invention provides a lens rapid switching device. The device comprises a lens barrel, a lens holder, a repulsion mechanism, a limiting part and a pressing ring. One end of the lens barrel is provided with a limiting bulge. The lens holder is arranged in the lens barrel and is provided with a lens. The outer diameter of the lens holder is in clearance fit with the inner diameter of the lens barrel. The repulsion mechanism is arranged between the limiting bulge and the lens holder, and enables the lens holder to rapidly get away from the limiting bulge. The limiting part is positioned on the sidewall of the lens barrel and is telescopic. The pressing ring is positioned at the other end of the lens barrel. The lens holder can move between the limiting bulge and the pressing ring. At a first state, the limiting part extends out, and the lens holder abuts against the limiting part under the action of the repulsion mechanism. At this time, the lens is at a first position. At a second state, the limiting part is retracted, and the lens holder moves to be at a second position to abut against the pressing ring under the action of the repulsion mechanism. In this way, the switching of the lens between the first position and the second position is realized. As a result, the switching between two particular positions is reliably realized. During the above process, the lens switching operation can be completed at the millisecond level, so that the rapid switching purpose is realized. The invention correspondingly provides a zoom lens.

Description

technical field [0001] The invention relates to the technical field of optical precision mechanical structures, in particular to a lens fast switching device and a zoom lens provided with the device. Background technique [0002] The optical lens is an essential part of the machine vision system, which directly affects the quality of the image and affects the realization and effect of the algorithm. Optical lenses can be divided into short-focus lenses, medium-focus lenses, and telephoto lenses in terms of focal length; wide-angle, standard, and telephoto lenses in terms of field of view; fixed-aperture fixed-focus lenses and manual aperture fixed-focus lenses in terms of structure. Auto-iris fixed-focus lenses, manual zoom lenses, auto-zoom lenses, auto-iris electric zoom lenses, electric three-variable (aperture, focal length, and focus) lenses, etc. [0003] The zoom lens can change the shooting range by changing the focal length without changing the shooting distance, s...

AI Technical Summary

Problems solved by technology

This method has stable movement and long focusing distance, but the structure is relatively complicated, the aperture will be relatively large, and the most important thing is that it cannot achieve very fast switching

Some optomechanical systems only need to achieve two specific positions for focusing, and the focusing process requires the lens to switch to the specified position within a few milliseconds, so the commonly used mechanisms are often unable to achieve

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