Ultra-small-diameter large-depth-of-field high-resolution endoscopic optical imaging system

Abstract

The invention relates to an ultra-small-diameter large-depth-of-field high-resolution endoscopic optical imaging system which comprises a first lens, a second lens, a diaphragm, a third lens, a fourthlens, an infrared filter and chip protection glass which are sequentially arranged from the object side. Wherein the first lens, the second lens, the third lens and the fourth lens are spherical lenses and are separately arranged by taking air as an interval, the first lens has negative focal power, the object side surface of the first lens is a plane, and the image side surface of the first lensis a concave surface; the second lens has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface is a convex surface; the third lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface; the fourth lens has positive focal power, the object side surface of the fourth lens isa convex surface, and the image side surface is a convex surface; the maximum effective radius of the object side surface of the first lens is less than or equal to 0.5; and the lens F number of the endoscopic optical imaging system is 58. The lens with the ultra-small diameter, the large field depth and the high resolution is compact in structure, convenient to machine and install and good in imaging quality.

Description

technical field [0001] The invention relates to the technical field of endoscopic optical imaging systems, in particular to an ultra-fine-diameter, large-depth-of-field, and high-resolution endoscopic optical imaging system. Background technique [0002] With the development of science and technology, medical endoscopes have undergone a transformation process from rigid medical endoscopes to fiber optic endoscopes and then to electronic endoscopes. The lens is an important part of the medical endoscope, and its imaging quality directly affects the use effect of the endoscope. And for the endoscope device, it will develop in the direction of miniaturization, wide observation range and high performance. Endoscope is a kind of medical testing equipment that is very commonly used at present. It can enter the position of the lesion to be inspected through the natural channel of the human body, and perform real-time dynamic imaging of the lesion. Therefore, the smaller the size ...

AI Technical Summary

Problems solved by technology

Endoscope is a kind of medical testing equipment that is very commonly used at present. It can enter the position of the lesion to be inspected through the natural channel of the human body, and perform real-time dynamic imaging of the lesion. Can not reach, and cause discomfort to the human body, so the smaller the size of the endoscope, the less discomfort it will cause to the human body, and the greater competitiveness in the market

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