Design method of small-distortion hard endoscope optical system

Abstract

The invention relates to a design method of a small-distortion hard endoscope optical system. The design method comprises the following steps of 1, determining parameters and a discrete view field, and outputting a relative distortion value; 2, calculating a discrete field of view corresponding to the camera adapter and relative distortion which should be generated by the discrete field of view; 3, calculating the actual image height which should be realized by the camera adapter; and 4, coaxially configuring the camera adapter behind the rigid endoscope optical visual tube to form a small-distortion rigid endoscope optical system. According to the method, distortion opposite to the optical visual tube is generated through the camera adapter, distortion correction is carried out, and the effects of large field of view and small distortion of the hard endoscope can be realized; compared with a design method for carrying out distortion correction at the optical visual tube with strict limitation of the lens size, the method provided by the invention is lower in processing and assembling difficulty.

Description

technical field [0001] The application relates to a design method of a small distortion rigid endoscope optical system. Background technique [0002] When the rigid endoscope images the target, the target light passes through the objective lens group, the rod mirror relay group, the eyepiece group, and the camera adapter in sequence, and finally forms an image on the image detector. The traditional rigid endoscope optical system combines the objective lens group, the rod mirror relay group, and the eyepiece into an optical tube, which is designed and manufactured in one piece. The camera adapter is designed and manufactured separately. The aberrations of the two parts are independently corrected, and finally connected by a mechanical bayonet. When doctors perform minimally invasive surgery, most of the objective lens group and rod mirror relay group need to be inserted into the human body. The lens diameter of this part is small, the field of view is large, and the distortio...

AI Technical Summary

Problems solved by technology

There are two conventional methods for large distortion correction: optical correction and image correction. Image correction loses a certain resolution. Optical correction usually uses aspheric surfaces or increases the complexity of the optical system without using aspheric surfaces (for example, Chinese patent disclosure documents CN107102433B)

For rigid endoscope optical tubes, especially otoscopes, sinusscopes, arthroscopes, cystoscopes, etc., due to the strict limitation of lens size, these two optical correction methods will make processing and assembly more difficult, especially Processing of High-Precision Very Small Aperture Glass Aspheric Lens

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