| 摘要 |
PROBLEM TO BE SOLVED: To provide a photoelectric sensor capable of precisely detecting the glossiness of a target without using a beam splitter. SOLUTION: The photoelectric sensor is equipped with one floodlight projecting region 11 for irradiating the target with light and three light detecting regions 14 for detecting the reflected light from the target. Three light detecting regions 14 are arranged on one straight line at an almost equal interval so as to be adjacent to the floodlight projecting region 11 so that the arranging direction of the central light detecting region 14 and the floodlight projecting region 11 crosses the arranging direction of three light detecting regions 14 at an almost right angle. The floodlight projecting region 11 and the central light detecting region 14 transmit only P polarized light and both left and right light detecting regions 14 transmit only S polarized light. The quantity of the diffused reflected light among light detection quantities is removed by subtracting the light detecting quantities in two left and right light detecting regions 14 from the light detecting quantity in the central light detecting region 14 to detect the quantity of regular reflected light and the glossiness of the target can be detected on the basis of the quantity of regular reflected light. COPYRIGHT: (C)2007,JPO&INPIT
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