Endoscope optical system, endoscope and endoscope system

Abstract

The invention provides an endoscope optical system, an endoscope and an endoscope system. The endoscope optical system comprises a diaphragm and a lens assembly, wherein a target lens exists in the lens assembly, and the target surface of the target lens is plated with a filter film layer; and the difference between the curvature of the target surface and the incident wavefront curvature of main light rays of each view field of the target surface is within a set curvature range, so that the incident angle of the main light rays of each view field on the target surface of the target lens is smaller than or equal to a set angle. According to the endoscope optical system, adverse effects caused by wavelength drift are effectively eliminated or reduced, and besides, use of an optical filter is reduced, so that the endoscope optical system is simple in structure and low in cost when wavelength drift is reduced.

Description

technical field [0001] The present application relates to the technical field of endoscopes, in particular to an endoscope optical system, an endoscope and an endoscope system. Background technique [0002] In some special application environments, the endoscope optical system needs to use a filter plate coated with a filter film to filter out unnecessary wavelength bands. However, endoscopes generally have a larger viewing angle. When the film thickness of the filter film is constant, the larger the incident angle of the light, the longer the optical path of the light in the filter film, and the more It is easy to cause the filtered wavelength to drift to the long-wave direction, and the transmitted wavelength to drift to the short-wave direction, causing the endoscope optical system to appear bluish in the endoscope image under a large field of view. [0003] In order to solve the above problems, in the related art, the impact of wavelength drift is reduced by improving t...

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Problems solved by technology

However, endoscopes generally have a larger viewing angle. When the film thickness of the filter film is constant, the larger the incident angle of the light, the longer the optical path of the light in the filter film, and the more It is easy to cause the filtered wavelength to drift to the long-wave direction, and the transmitted wavelength to drift to the short-wave direction, causing the endoscope optical system to appear bluish in the endoscope image under a large field of view

[0003] In order to solve the above problems, in the related art, the impact of wavelength drift is reduced by improving the coating process of the filter film layer of the filter. However, the filter film layer is often obtained by superimposing multiple film layers. The process is complicated, and the filter film needs to be plated on the substrate to form a filter film, which increases the manufacturing cost

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