| 摘要 |
PROBLEM TO BE SOLVED: To reduce the possibility of incorrect determination and incorrect detection due to disturbance light.SOLUTION: A reflection type optical sensor includes: light projection and reception elements 1 that each comprise a surface light emitting LED including a current constriction structure and a double hetero structure, and emits light and receives return light; light projection circuits 2 that drive the light projection and reception elements 1; light reception circuits 3 that detect a voltage between the anode and cathode of the light projection and reception elements 1 and output voltage signals; a determination unit 4 that determines whether or not an object is present in a direction of the light emission by each of the light projection and reception elements 1 on the basis of a change in impedance of the light projection and reception elements 1; and a display unit 5 that displays a result of the determination by the determination unit 4. |
