| 摘要 |
PROBLEM TO BE SOLVED: To eliminate fluctuation in light emission output caused by influences of various characteristics, which include temperature characteristics, and a secular change and the like of a light-emitting element.SOLUTION: In a reflection type sensor device that has an LED 11 and a light receiving element 12 for a sensor that receives light from a reflector 4 on the basis of light emission of the LED 11, a light receiving element 13 for a monitor that directly receives light from the LED 11 is provided. Output light of the LED 11 is feedback-controlled on the basis of an output signal of the light receiving element 13 for a monitor. On an upper surface (a surface where reflection light from the reflector hits) of an encapsulation part (22) that encapsulates the light receiving element 13 for a monitor, an upper surface shading wall (25) is provided. In addition, a shading plate may be provided on the light receiving element 13 itself.SELECTED DRAWING: Figure 1 |
