Novel wide-angle lens of endoscope

Abstract

Disclosed is a novel wide-angle lens for an endoscope, wherein an object lens of the novel wide-angle lens includes a combination of a uniform plano-convex lens and a Grin lens, and the view angle of the lens is widened by increasing the difference between refractive indexes of the lens center and the lens periphery. The Grin lens is adopted at the lens center while the uniform plano-convex lens is adopted at the periphery from one to two apertures, the refractive index of the uniform plano-convex lens is smaller than the smallest refractive index of the Grin lens, and the periphery of the lens is manufactured non-transparently, thereby preventing stray light generated by light reflecting on the sides of the lens.

Description

technical field [0001] The invention relates to a novel wide-angle lens of an endoscope. That is, the objective lens system used for the distal end of the endoscope, specifically the objective lens of the wide-angle endoscope, which can provide a wider viewing angle. Background technique [0002] Endoscope is an optical instrument, and it has a history of 200 years since its appearance. With the rapid development of advanced science and technology, the types and levels of endoscopes have also advanced by leaps and bounds, from rigid tube mirrors and fiber endoscopes to electronic endoscopes and ultrasonic electronic mirrors. The structure of the endoscope is such that the real image generated by the objective lens located at the distal end is transmitted to a position convenient for observation through the image transmission optics. From the perspective of the use of endoscopes, the objective lens at the distal end of the endoscope needs to be small in diameter, but also h...

AI Technical Summary

Problems solved by technology

From the perspective of the use of endoscopes, the objective lens at the distal end of the endoscope needs to be small in diameter, but also has the ability to form an internal focus within a wide viewing angle, and optical devices including multiple spherical lenses can provide a wide field of view. While effectively correcting various aberrations, the result of using multiple spherical lenses with an outer diameter of less than 1 mm results in a substantial increase in cost due to the associated polishing, assembly, adjustment and operation of the lenses