Optical imaging system of endoscope

Abstract

The invention relates to an optical imaging system of an endoscope. The optical imaging system comprises an objective system, a relay mirror system and an eyepiece system, wherein the objective system, the relay mirror system and the eyepiece system are glued integrally in sequence in the light ray transmission direction; the objective system is an inverted telephoto system, and comprises a first protection window, a first flat concave lens, a deflecting prism, a first flat convex lens, a first two-gluing lens, a second two-gluing lens, a third two-gluing lens and a second flat convex lens, wherein the first protection window, the first flat concave lens, the deflecting prism, the first flat convex lens, the first two-gluing lens, the second two-gluing lens, the third two-gluing lens and the second flat convex lens are glued integrally in sequence in the light ray transmission direction; the relay mirror system comprises n sets of relay mirror sets, each set of relay mirror sets are all of dual-telecentric structures, and the relay mirror sets are constituted by symmetrically arranging two five-glue rod-shaped lens; the eyepiece system is of a telecentric structure, and comprises a first three-gluing lens, a second three-gluing lens, a second convex lens, a second protection window and a second aperture stop, wherein the first three-gluing lens, the second three-gluing lens, the second convex lens, the second protection window and the second aperture stop are glued integrally in sequence in the light ray transmission direction. The optical imaging system of the endoscope has high definition resolution and optical imaging performance with distortion smaller than 5%.

Description

technical field [0001] The invention relates to an optical imaging system, in particular to an endoscope optical imaging system. Background technique [0002] The endoscope is composed of an imaging objective lens at the end, an image relay system at the middle section, and an eyepiece at the proximal end. The imaging objective lens plays a decisive role in the imaging performance of the endoscope. Medical diagnosis and surgery require endoscopes to have the characteristics of large field of view, high resolution, low distortion and small diameter, which puts high demands on the objective lens imaging system and image transfer system of endoscopes. [0003] Some of the existing endoscope optical systems are composed of plano-concave negative lenses, steering prisms, plano-convex lenses, and subsequent cemented lenses. It optimizes the position of the positive and negative lenses in the objective lens group to correct the distortion of the system, but it does not give the ach...

AI Technical Summary

Problems solved by technology

[0003] Some of the existing endoscope optical systems are composed of plano-concave negative lenses, steering prisms, plano-convex lenses, and follow-up cemented lenses. It optimizes the position of the positive and negative lenses in the objective lens group to correct the distortion of the system, but does not give the achievable Relative distortion value; some are designed with endoscope objective lens made of sapphire material, which is composed of two plano-convex mirrors, and the maximum optical distortion is 20%

[0004] In summary, the existing endoscopic optical systems cannot correct the optical distortion of the large field of view well and at the same time ensure the optical high-definition imaging in the full field of view

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