Retrofocus-type objective for endoscopes

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

1975-11-26

1977-07-26

Corbin, John K.

350208, 350220, 350225, G02B 1304

Patent

active

040379388

ABSTRACT:
A compact retrofocus-type wide-angle objective for endoscopes comprising a front diverging lens group comprising a lens having negative power and a rear converging lens group comprising a positive lens on which absolute value of radius of curvature on the object side surface is larger than that on the image side surface and a cemented positive doublet lens whose cemented surface has negative refractive power.

REFERENCES:
patent: 2933018 (1960-04-01), Sandbach
patent: 3829198 (1974-08-01), Takahashi

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