Surgery – Endoscope – Having imaging and illumination means
Patent
1997-09-16
1998-10-27
Mancene, Gene
Surgery
Endoscope
Having imaging and illumination means
600174, 600177, 600182, A61B 104
Patent
active
058271724
ABSTRACT:
An optical system for electronic endoscopes which makes it possible to thin tips of endoscopes and minimize illumination ununiformities. In this optical system, a prism having a half transmissive mirror film formed thereon is disposed on a rear side of an objective optical system, a CCD is optically connected to a reflecting optical path in which rays are flexed at a right angle and a light guide is connected to a straight travelling optical path. A light diffusing plate and a condenser lens are arranged between the light guide and the prism. This arrangement makes it possible to dispose the objective optical system in series with the light guide in a tip of endoscope, thereby enabling to thin the tip. Further, the diffusing plate prevents an image of a shape of an end surface of an optical fiber bundle from being projected reversely to an image pickup device. Furthermore, insufficient amount of rays in an outer circumferential portion can be corrected and uniform illumination can be obtained by arranging optical fibers at a higher density in an outer circumferential portion of the light guide.
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Takahashi Kazuaki
Torii Yuichi
Fuji Photo Optical Co., Ltd.
Hatton Ira
Mancene Gene
Snider Ronald R.
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