| 摘要 |
<P>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. <P>SOLUTION: Light Pf emitted from 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 with a change rate ε1. The pulse light reflected by the object to be detected is received by photoreception means, to determine a change rate ε2 of received light amount W of the pulse light Pg shown in Fig. 2(b). The change rate ε2 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 reflectance δ of the object to be detected is different, and therefore the reflectance δ of the object to be detected is selectively determined in response to the change rate ε2 of the received light amount W of the determined pulse light Pg, based on correlation data between the reflectance δ and the change rate ε2. <P>COPYRIGHT: (C)2013,JPO&INPIT |
