| 摘要 |
PROBLEM TO BE SOLVED: To provide a reflection type photoelectric sensor capable of determining a reflectance of an object to be detected, from the photoelectric sensor, in addition to detection of the presence of the object to be detected. SOLUTION: Light Pf emitted from a light projection means to the object to be detected is divided into the first-sixth pulse lights Pf1-Pf6, as shown in Fig.2(a), projection light amount E of the respective lights are made different each other, and the object to be detected is irradiated with the light Pf of change rateε1. The pulse light reflected by the object to be detected is received by a photoreception means, to determine a change rateε2 of received light amount W of the pulse light Pg shown in Fig.2(b). The change rateε2 of the received light amount W of the pulse light Pg is varied as shown in the Fig.2(b) or Fig.2(c), when the reflectanceδof the object to be detected is different, and therefore the reflectanceδof the object to be detected is selectively determined in response to the change rateε2 of received light amount W of the determined pulse light Pg, based on a correlation data between the both. COPYRIGHT: (C)2009,JPO&INPIT
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