Objective lens system for endoscopes

Details Objective lens system for endoscopes Objective lens system for endoscopes

1989-05-02

1990-12-11

Sugarman, Scott J.

350423, 350432, G02B 1514, G02B 1318

Patent

active

049765221

ABSTRACT:
An objective lens system comprising, in the order from the object side, a first lens group having negative refractive power and a second lens group having positive refractive power, and so adapted as to perform variation of focal length and focusing by shifting the second lens group, with the first lens group kept fixed, in such a manner that magnification of the second lens group satisfies a certain definite condition.

REFERENCES:
patent: 4042295 (1977-08-01), Yamasita et al.
patent: 4312572 (1982-01-01), Yamashita et al.
patent: 4874232 (1989-10-01), Hasegawa

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