| 摘要 |
PROBLEM TO BE SOLVED: To provide a paper detection sensor that has a simple structure and can detect paper by a simple method, and to provide a method of detecting paper. SOLUTION: The paper detection sensor includes photoresistors 11a, 11b disposed in a paper detection area and a means of detecting the presence or absence of paper, based on a change in the value of resistance in the photoresistors 11a, 11b. In the paper detection sensor, the width of the paper detection area is not less than the width occupied by the paper, when the paper enters the paper detection area, the first photoresistor 11a is disposed over one end, in a direction substantially vertical with respect to the entry direction of the paper from one predetermined reference position within the paper detection area, and the second photoresistor 11b is disposed independently of the first photoresistor 11a over the other end section, in a direction substantially vertical with respect to the entrance direction of the paper from the reference position. COPYRIGHT: (C)2011,JPO&INPIT
|
