Relay lens structure of 4K laparoscope

Abstract

The invention relates to a relay lens structure of a 4K laparoscope. The relay lens structure is composed of two completely symmetrical lens groups which are sequentially glued into a whole in the light direction; and the relay lens structure is characterized in that each lens group comprises a first lens, a second lens, a third lens and a fourth lens, wherein the end face of one side of the firstlens is of an even aspheric surface structure, the end face of the other side of the first lens is a convex face, the end face of one side of the second lens is a concave face, the end face of the other side of the second lens is a plane, the end face of one side of the fourth lens is a plane, the end face of the other side of the fourth lens is of an aspheric surface structure, the convex face of the first lens and the concave face of the second lens are opposite and glued into a whole, the plane of the second lens and the end face of one side of the third lens are opposite and glued into awhole, and the end face of the other side of the third lens and the plane of one side of the fourth lens are opposite and glued into a whole. According to the relay lens structure, in order to realizeperfect aberration elimination under the condition of high numerical aperture, meanwhile, the field curvature is balanced, so that the 4K resolution can be met.

Description

technical field [0001] The invention relates to a relay mirror structure, in particular to a relay mirror structure of a 4K laparoscope, and belongs to the technical field of laparoscopes in medical instruments. Background technique [0002] Rigid laparoscope consists of three parts, objective lens (Objective), relay mirror (Relay Lens) and eyepiece (Ocular). Working principle: The lesion surface is illuminated by the light introduced by the optical fiber bundle, the objective lens images the lesion surface to the back focal plane of the objective lens, and the image of the back focal plane of the objective lens is transmitted to the eyepiece by three or five sets of relay systems with a magnification of -1 Near the front focal plane of the eyepiece, the beam exiting from the exit pupil of the eyepiece is close to parallel light. The human eye can observe directly at the exit pupil of the eyepiece, or use an adapter to image the image onto the focal plane detector, which ca...

AI Technical Summary

Problems solved by technology

The disadvantage is that the three sets of fully symmetrical mirrors will accumulate axial aberrations and form a large residual field curvature, which makes it difficult to balance the mirror aberrations of the entire mirror, especially when designing 4K ultra-high-definition resolution laparoscopes. , such disadvantages become unbearable

The resolution of 4K UHD laparoscopy is double that of FHD, and the value of NA (numerical aperture: a key parameter that determines the ultimate resolution of the optical system, the larger the value, the higher the achievable ultimate resolution) is expected to reach 0.14. Some structural forms are not sufficient to support the transfer of new higher-resolution rigid laparoscopic intermediate images

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