Small distortion large vision field stereo endoscope object lens structure

Abstract

The invention discloses a small distortion large vision field stereo endoscope object lens structure. The small distortion large vision field stereo endoscope object lens structure comprises a direct vision endoscope and a strabismus endoscope, wherein the direct vision endoscope sequentially comprises protection glass, a first negative lens, a second negative lens, a parallel flat board, a flat convex lens and a subsequent glued lens group along a light spreading direction, and the strabismus endoscope sequentially comprises protection glass, a first negative lens, a second negative lens, a parallel flat board, a turning prism, a flat convex lens and a subsequent glued lens group along the light spreading direction. The small distortion large vision field stereo endoscope object lens structure has an ingenious structure, the two negative lenses are in front of a diaphragm, the first negative lens is a flat concave negative lens, the second negative lens is a convex concave negative lens, the two negative lenses are organically combined, system distortion can be corrected through optimization design, so large vision field small distortion endoscope optics systems can be designed out, the first negative lens and the second negative lens are respectively glued to the parallel flat board, the technology is good, positioning precision is high, the sealing technology is improved, and assembly and adjustment cost is reduced.

Description

technical field [0001] The invention relates to an endoscope objective lens structure, in particular to a three-dimensional endoscope objective lens structure with small distortion and large field of view, and belongs to the technical field of optical system design of rigid tube endoscopes. Background technique [0002] Such as figure 1 As shown, the optical system of the rigid tube endoscope consists of three parts: OBJ is the objective lens of the rigid tube endoscope, which forms an inverted image of the object; REL is the optical transfer system of the rigid tube endoscope, and the image formed by the rigid tube endoscope is re-1:1 Imaging, after multiple image transfers, finally forms an upright real image at the focal plane of the eyepiece of the rigid tube endoscope; OCU is the eyepiece of the rigid tube endoscope, imaging the endoscope image at infinity, through which the observer can observe the aforementioned Stand upright. [0003] The commonly used rigid tube e...

AI Technical Summary

Problems solved by technology

[0014] Figure 7 The disadvantage of the endoscope objective lens structure shown is that the first surface of the second plano-concave lens is a plane, and in terms of aberration correction, there is one less variable, which cannot correct image distortion well; on the other hand, the first plano-concave lens and When the second plano-concave lens is cemented, due to the siphon phenomenon, the UV glue will be sucked into the concave surface of the first plano-concave lens, resulting in a decrease in the image quality of the peripheral field of view or failure to image

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