| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent incorrect operations caused in a boundary of color, luster and brightness and enable detection by a method wherein a field of view of light reception in a flood spot is separated into a plurality of parts, and when all judgment results of each of fields of view are matched with each other, the judgment results are validated. SOLUTION: Emitted lights from red color and blue color LED's 3a, 3b are flooded to a detection object 2 via a dichroic mirror 4 and a flood lens 5, and reflection lights are converted into a light receiving signal by a bisected PD 7. The bisected PD 7 has first and second fields of view 9a, 9b separated in a flood spot 8 on the detection object 2 of the LED's 3a, 3b, and PD's 7a, 7b output a light receiving signal in the fields of view 9a, 9b, respectively. Thus, the light receiving field of view is bisected in the flood spot 8 on the detection object 2, and color judgment is made each of the fields of view 9a, 9b, and when both results are matched with, the results are validated. Therefore, it is possible to prevent incorrect operations caused in a boundary of a color having no connection with a teaching color, and to stably detect only a specified color even when there are various color patterns, characters, etc., on the detection object 2.</p> |
