Retrofocus-type objective for endoscopes

Details Retrofocus-type objective for endoscopes Retrofocus-type objective for endoscopes

1975-10-14

1977-08-16

Corbin, John K.

350225, G02B 1304

Patent

active

040422950

ABSTRACT:
A retrofocus-type objective for endoscopes comprising a front diverging lens group and rear converging lens group and arranged to be focused by keeping the front diverging lens group fixed and moving the rear converging lens group toward the front diverging lens group.

REFERENCES:
patent: 2893717 (1959-07-01), Simmons
patent: 3576358 (1971-04-01), Hayamizu et al.

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