Optical system for endoscopes

Details Optical system for endoscopes Optical system for endoscopes

1987-09-22

1990-02-20

Sugarman, Scott J.

350330, 350410, 350414, 350432, 350450, 3542271, G02F 113, G02B 1318, G02B 2102

Patent

active

049021150

ABSTRACT:
In order to facilitate accommodation into a narrow space and enable to reserve an observation range wider than those conventionally available while assuring high reliability and brightness sufficient for practical use, the optical system for endoscopes comprises a stop capable of varying aperture into plural number of shapes and/or sizes, and a lens system arranged in the vicinity of said stop and designed in such a manner that the lens surface portions corresponding to the varied stop apertures and sizes have focal length different from each other. Said optical system is applicable as an objective lens, relay lens and eyepiece.

REFERENCES:
patent: 4159864 (1979-07-01), Yasukuni et al.

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