Original edge detecting system and optical sensor
First Claim
1. An original edge detecting system comprising:
- an original placement table, on which an original sheet is placed;
original scanning means for causing a light beam to scan the original sheet placed on said original placement table;
light receiving means for receiving a light beam which has been reflected by the original sheet placed on said original placement table after being emitted by said original scanning means; and
original edge determining means for monitoring light intensity of the light beam received by said light receiving means,said original edge determining means determining that the light beam currently being received by said light receiving means is a light beam reflected by an edge of the original sheet placed on said 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 said original scanning means.
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Accused Products
Abstract
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.
29 Citations
7 Claims
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1. An original edge detecting system comprising:
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an original placement table, on which an original sheet is placed; original scanning means for causing a light beam to scan the original sheet placed on said original placement table; light receiving means for receiving a light beam which has been reflected by the original sheet placed on said original placement table after being emitted by said original scanning means; and original edge determining means for monitoring light intensity of the light beam received by said light receiving means, said original edge determining means determining that the light beam currently being received by said light receiving means is a light beam reflected by an edge of the original sheet placed on said 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 said original scanning means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification