Hard Tube Endoscope Optical Imaging Display System

Abstract

A display system for optical imaging of a rigid-tube endoscope comprises an objective lens system (1), a relay lens system (2) and an ocular lens system (3) that are sequentially cemented as a whole in a light propagation direction. The relay lens system (2) is located between the objective lens system (1) and the ocular lens system (3). The objective lens system (1) is of a retrofocus structure and comprises a first protective window (11), a plano-concave lens (12), a prism combination (13), a first plano-convex lens (14), a first cemented doublet (15), a first meniscus lens (16), a second plano-convex lens (17), a second meniscus lens (18), and a third meniscus lens (19) that are sequentially cemented in a light propagation direction. The system has optical imaging performance of a high resolution and a low distortion less than 1.1%.

Description

technical field [0001] The invention specifically relates to a rigid tube type endoscope optical imaging display system. Background technique [0002] Rigid tube laparoscopy has a development history of more than 100 years, and has formed many brand products of different grades. The existing rigid tube laparoscope is composed of an imaging objective lens at the end, a relay system at the middle section and an eyepiece at the proximal end, wherein the imaging objective lens plays a decisive role in the imaging performance of the laparoscope. Laparoscopy requires a large field of view and small diameter, while medical diagnosis and surgery require high-definition and low-distortion imaging of the endoscope, which puts high demands on the objective lens imaging system and image transfer system of the endoscope. For example, for the current 1920*1080 high-definition display electronic devices, the optical system of the endoscope is required to achieve high-definition imaging in...

AI Technical Summary

Problems solved by technology

[0003] Some of the existing endoscope optical systems are composed of plano-concave negative lens, turning prism, and follow-up cemented lens. It uses the first negative lens to increase the rear working distance of the objective lens, forms an intermediate phase plane before the rod mirror, and uses the positive The combination and collocation of negative lenses realize the distortion correction of the system, but the relative distortion value is still around 10%. To achieve high-definition imaging, the Lach invariant nuy of the speculum must be increased, that is, the diameter of the optical path must be increased. However, the traditional steering prism design limits The size of the aperture is not conducive to the realization of high-definition

[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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