Single-lens reflex optical system for endoscopes

Details Single-lens reflex optical system for endoscopes Single-lens reflex optical system for endoscopes

1981-01-06

1983-06-14

Corbin, John K.

350 9626, 350445, G02B 517

Patent

active

043879691

ABSTRACT:
A single-lens reflex optical system for endoscopes comprising an observing optical system, a light-splitting means and a photographing optical system, the observing optical system comprising a diverging front lens group arranged on a first optical axis extending in parallel with the longitudinal direction of an endoscope and having negative refractive power, a positive lens group arranged on the first optical axis, and a first converging rear lens group arranged on the first optical axis and having positive refractive power, the light-splitting means arranged between the positive lens group and first converging rear lens group, the photographing optical system comprising the diverging front lens group, the positive lens group, and a second converging rear lens group arranged on a second optical axis deflected by the light-splitting means and having positive refractive power, the single-lens reflex optical system enabling to make diameters of lenses small and, consequently, enabling to make the diameter of distal end of endoscope small.

REFERENCES:
patent: 3918072 (1975-11-01), Imai et al.
patent: 4025155 (1977-05-01), Imai
patent: 4113354 (1978-09-01), Yamasita et al.

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