Illuminating optical system for endoscopes

Details Illuminating optical system for endoscopes Illuminating optical system for endoscopes

1985-06-05

1988-01-26

Sikes, William L.

350 9618, G02B 2326

Patent

active

047213590

ABSTRACT:
In order to make it possible to uniformly illuminate the surface of an object to be observed, an illuminating optical system for endoscopes comprises a light supplying side light guide, a light receiving side light guide arranged as spaced from and aligned with the light supplying side light guide and a connecting optical system arranged between the light supplying side light guide and light receiving side light guide and consisting of at least one convex lens and one concave lens. A concave lens for expanding the light bundle is arranged in front of the exit end of the light receiving side light guide. A light intercepting member intercepting a part of the light bundle in response to the brightness distribution on the object image surface may be provided between the light supplying side light guide and light receiving side light guide.

REFERENCES:
patent: 4294511 (1981-10-01), Yamashita et al.
patent: 4390012 (1983-06-01), Mizumoto
patent: 4427977 (1984-01-01), Carollo et al.
patent: 4483585 (1984-11-01), Takami
patent: 4576435 (1986-03-01), Nishioka
patent: 4588265 (1986-05-01), Takahashi

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