Illuminating optical system for endoscopes

Details Illuminating optical system for endoscopes Illuminating optical system for endoscopes

1984-09-20

1987-05-19

Sikes, William L.

350 9626, G02B 606

Patent

active

046662464

ABSTRACT:
An illuminating optical system for endoscopes comprising a light guide, a concave lens arranged in front of the exit end of the light guide and having a peripheral part weak in the refractive power and a plate-shaped transparent member interposed between the light guide and concave lens, in order to ensure a sufficient illuminating light amount on the periphery of the visual field and decrease the light amount loss. The transparent member and the concave lens may be respectively formed of a single fiber, and an optical member formed of a single fiber may be arranged in front of the concave lens to extend the total length of the optical system.

REFERENCES:
patent: 3918072 (1975-11-01), Imai et al.
patent: 3918438 (1975-11-01), Hayamizu et al.
patent: 4101196 (1978-07-01), Imai
patent: 4273109 (1981-06-01), Enderby
patent: 4354734 (1982-10-01), Nakahashi
patent: 4483585 (1984-11-01), Takami
patent: 4500181 (1985-02-01), Takahashi
patent: 4529267 (1985-07-01), Nishioka et al.

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