| 摘要 |
An optical sensor (101) includes: a driving circuit (8) that causes a light-emitting element (LED) to be off during a first period, a second period, and a fourth period and that causes the light-emitting element (LED) to be on during a third period; an integrating circuit (1) that outputs a first integrated-value difference and a second integrated-value difference, the first integrated-value difference being a difference between an integrated value of a photocurrent generated by a light-receiving element (PD) in accordance with respective states of the light-emitting element (LED) during the first period and the second period, the second integrated-value difference being a difference between an integrated value of a photocurrent generated in accordance with respective state of the light-emitting element (LED) during the third period and the fourth period; and an output control circuit (3) that outputs the second integrated-value difference when the first integrated-value difference is zero and that outputs a difference between the second integrated-value difference and the first integrated-value difference when the first integrated-value difference is not zero. |
