Focusing objective lens system for endoscopes

Details Focusing objective lens system for endoscopes Focusing objective lens system for endoscopes

1979-12-27

1982-01-26

Corbin, John K.

350464, 350476, G02B 962

Patent

active

043125727

ABSTRACT:
An objective lens system for endoscopes comprising a first lens group having positive refractive power, a second lens group having negative refractive power and a third lens group having positive refractive power, and being so adapted as to permit focusing and at the same time observation at a magnification level different from ordinary magnification level matched with distance to an object to be observed.

REFERENCES:
patent: 3994572 (1976-11-01), Uesugi
patent: 4118108 (1978-10-01), Muszumanski

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