| 摘要 |
An infrared detection sensor is provided with a phototransmitter including light projection portions projecting infrared rays, and a photoreceiver including light reception portions, which are respectively placed opposite to the light projection portions, receiving the infrared rays from the light projection portions. The light projection portions are made of upper and lower light projection portions, and the light reception portions are made of upper and lower light reception portions. The phototransmitter includes a light projection control means for increasing a signal output level of a leading edge portion in the infrared rays projected from the light projection portions.
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