Retrofocus-type objective for endoscopes

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

1977-02-14

1977-11-22

Clark, Conrad J.

350255, G02B 1304

Patent

active

040593444

ABSTRACT:
A retrofocus-type objective for endoscopes comprising a front diverging lens group and rear converging lens group, said rear lens group being divided into a first lens group and second lens group, said retrofocus-type objective being arranged to be focused by varying the airspace between said first and second lens groups. By the above arrangement, the front lens is kept fixed and serves also as a cover glass so that the retrofocus-type objective as a whole becomes small in size.

REFERENCES:
patent: 3473866 (1969-10-01), Kirchhoff

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