发明授权
US5929436A Optical sensor including a first and second converging optical system
for edge detection
失效
光学传感器包括用于边缘检测的第一和第二会聚光学系统
- 专利标题： Optical sensor including a first and second converging optical system for edge detection
- 专利标题（中）： 光学传感器包括用于边缘检测的第一和第二会聚光学系统
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申请号： US912368申请日： 1997-08-18
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公开(公告)号： US5929436A公开(公告)日： 1999-07-27
- 发明人: Nobuyuki Baba , Toshiharu Murai , Sumiaki Aoki , Koichi Kudo
- 申请人： Nobuyuki Baba , Toshiharu Murai , Sumiaki Aoki , Koichi Kudo
- 申请人地址： JPX Tokyo
- 专利权人： Ricoh Company, Ltd.
- 当前专利权人： Ricoh Company, Ltd.
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX7-109234 19950508; JPX7-194610 19950731; JPX7-255923 19951003; JPX7-283531 19951031; JPX8-60678 19960318
- 主分类号： G01J1/20
- IPC分类号： G01J1/20 ; G01N21/47 ; G03G15/00 ; H01J3/14 ; H04N1/00 ; H04N1/113
摘要：
An original placement table is provided, on which an original sheet is placed. An original scanning device causes a light beam to scan the original sheet placed on the original placement table. A light receiving device receives a light beam which has been reflected by the original sheet placed on the original placement table after being emitted by the original scanning device. An original edge determining device monitors light intensity of the light beam received by the light receiving device. The original edge determining device determines that the light beam currently being received by the light receiving device is the light beam reflected by an edge of the original sheet placed on the original placement table when a significant variation is detected in the light intensity either for the first time or for the last time in one scanning operation of the original scanning device.
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