Objective optical system for endoscope

Details Objective optical system for endoscope Objective optical system for endoscope

1984-07-18

1986-07-08

Corbin, John K.

G02B 1304, G02B 2324

Patent

active

045989800

ABSTRACT:
An objective optical system for an endoscope comprises a retrofocus objective lens assembly consisting of a front-stage diverging lens unit, an aperture diaphragm, a rear-stage converging lens unit, and a prism positioned in this sequence, and a self-scanning solid state image pickup device positioned at the image formation surface of said objective lens assembly. The objective lens assembly satisfies the conditions 0.8<.vertline.f1.vertline./f.ltoreq.1.5, 1<f2/f.ltoreq.1.5, and Np>1.7, where f denotes the resultant focal length of the whole assembly, f1 denotes the resultant focal length of the front-stage diverging lens unit, f2 designates the resultant focal length of the rear-stage converging lens unit, and Np designates the refractive index of the prism.

REFERENCES:
patent: 3663092 (1972-05-01), Schlegel
patent: 4037938 (1977-07-01), Yamashita et al.

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