Objective lens system for an endscope

Details Objective lens system for an endscope Objective lens system for an endscope

1985-07-24

1987-06-23

Corbin, John K.

350432, 350450, G02B 958, G02B 960, G02B 1318

Patent

active

046748440

ABSTRACT:
An objective lens system for an endoscope comprises a first lens component having a negative refracting power, a second lens component having a positive refracting power, a third lens component having a positive refracting power and a fourth lens component involving a meniscus lens having its concave surface facing the object side, with the lens system being such that the total length is short, the outside diameter is small, the angle of view is wide, and the illuminance in the peripheral portion of the image field is high.

REFERENCES:
patent: 2781695 (1957-02-01), Klemt
patent: 3209649 (1965-10-01), Macher
patent: 4176915 (1979-12-01), Mori

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