Endoscopic lens unit

Abstract

The invention discloses an endoscopic lens unit, comprising, from the objective side to the image side, a first lens having a concave objective face and a convex image face; a second lens having positive or negative focal powder; and an optical filter arranged between the second lens and the image side, wherein the first lens is a glass or plastic non-spherical lens, and the second lens is a glass or plastic non-spherical lens. The endoscopic lens unit also comprises a diaphragm which is positioned between the first lens and the objective side, or between the first lens and the second lens. The endoscopic lens unit provided herein has the advantage that as the lenses, the optical filter and the diaphragm are reasonably matched and limited, a large visual angle and a large depth of field can be guaranteed at the premise of lens diameter reduced, observation range is widened, and observation depth is increased.

Description

Technical field [0001] The invention relates to the technical field of medical lenses, in particular to an endoscope lens. Background technique [0002] An endoscope is a medical device that penetrates into the human body through the natural pores of the human body, and observes the internal structure or pathological conditions through imaging images. At present, most endoscopes have large calibers, and the process of entering the human body is painful, and it is not convenient to check the lesions with narrow passages. [0003] However, the current endoscope lens still has the problems of large diameter, small depth of field, and small field of view. The smaller the diameter of the endoscope, the less discomfort caused to the human body, and the excessive diameter of the endoscope will increase the production cost. At the same time, the size of the field of view and the depth of field are also important parameters used by the endoscope. A small field of view will affect the range...

AI Technical Summary

Problems solved by technology

At present, most endoscopes have large calibers, and the process of entering the human body is more painful, and it is not convenient to inspect the lesion with a narrow channel.

[0003] However, the current endoscope lens still has the problems of large caliber, small depth of field, and small field of view. The smaller the caliber of the endoscope, the less discomfort it will cause to the human body, and the large caliber of the endoscope will increase the production cost. At the same time, the field of view and depth of field are also important parameters for the use of endoscopes. A small field of view will affect the scope of lens observation, while a small depth of field will affect the depth of lens observation.

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