A high magnification wide-angle medical endoscopy optical zoom lens

Abstract

The invention discloses a high-magnification wide-angle medical endoscopic optical zoom lens, which sequentially includes a negative lens group, a diaphragm, a positive lens group, and an image sensor chip from the object side; the negative lens group and the display chip are fixed, and the light The diaphragm is closely attached to the object side of the positive lens group to form a whole, and moves between the negative lens group and the image sensor chip to realize zoom imaging. The lens design of the present invention can realize a field of view of 138.2° and an optical magnification of 520X. When switching between wide-angle and magnification configurations, the amount of focus adjustment is large, and slight focus adjustment has little impact on imaging quality. It is not easy to misuse, and the working state is easy to control. Good stability; in addition, the whole lens requires a small number of lenses, the overall structure is compact and simple, the difficulty of processing and assembly is low, the yield rate is high, and the cost is low; it is suitable for widespread promotion and use.

Description

technical field [0001] The invention relates to the technical field of medical operation detection devices, in particular to a high-magnification wide-angle medical endoscopic optical zoom lens. Background technique [0002] Endoscope refers to a detection device with image sensor, optical lens, lighting structure, mechanical device, etc., which can go deep into the digestive tract or other pipelines to observe the internal environment and transmit images so that doctors or professionals can make diagnosis. Medical endoscopes require a larger field of view angle in order to observe a larger range of digestive tract tissue to determine the location of the lesion. Zoom in so that doctors can take pictures of pathological parts, conduct diagnosis, discuss in meetings and keep files. While observing, the shooting process requires higher resolution, which also puts forward higher requirements for lens imaging quality. [0003] At present, most endoscopic lenses use fixed-focus ...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the endoscopic lenses are fixed-focus lenses, but the fixed-focus lenses cannot realize the observation of tissues in a large range (large field of view), and at the same time optically magnify local tissues

Among the few existing reports involving endoscopic zoom lenses, on the one hand, some of the zoom groups have a small adjustable range and are not easy to operate, which undoubtedly has great limitations in actual medical applications; Small field of view under magnification (700x600um field of view, 922um diagonal, 380x magnification, Int J CARS(2017)12:757–766 as reported in the literature); obviously, it is difficult to meet the actual medical observation needs

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