Retrofocus-type objective for an endoscope

Details Retrofocus-type objective for an endoscope Retrofocus-type objective for an endoscope

1987-12-01

1988-08-16

Corbin, John K.

350462, G02B 960

Patent

active

047640014

ABSTRACT:
A retrofocus-type objective for an endoscope which comprises a first lens component comprising a negative lens, a stop, a second lens component comprising a positive meniscus lens, a third lens component comprising a positive lens, a fourth lens component comprising a cemented doublet which consists of a positive lens and a negative lens, and a fifth lens component comprising positive lens, the retrofocus-type objective for an endoscope being arranged to be focused by advancing the third and fourth lens components.

REFERENCES:
patent: 4403837 (1983-09-01), Nakahashi

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