Light guide and endoscope

Details Light guide and endoscope Light guide and endoscope

2005-02-08

2005-02-08

Gibson, Roy D. (Department: 3739)

Surgery

Endoscope

Having imaging and illumination means

C600S180000

Reexamination Certificate

active

06852079

ABSTRACT:
An object of the present invention is to make the light distribution by a light guide even. In the light guide, an amount of light emitted from the central region in the light emission end face is relatively small in comparison with an amount of light emitted from a peripheral region in the light emission end face. For example, a mask for shielding light is provided near the light emission end face of the light guide. The mask is, for example, circular, and is aligned with an optical axis Z0as the center. By providing the mask, the light emitted from the central region in the light emission end face is shielded around the optical axis Z0.

REFERENCES:
patent: 4824225 (1989-04-01), Nishioka
patent: 4856495 (1989-08-01), Tohjoh et al.
patent: 4952040 (1990-08-01), Igarashi
patent: 5485316 (1996-01-01), Mori et al.
patent: 5587839 (1996-12-01), Miyano et al.
patent: 5777797 (1998-07-01), Miyano
patent: 5827172 (1998-10-01), Takahashi et al.
patent: 5980454 (1999-11-01), Broome

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