Teijin Pharma Limited

Kazunori Takahashi

Yuki Kawase

Takuya Nanjo

Toshihiro Sato

A phototherapy deviceincludes a laser light sourcefor emitting laser light at a target portion T, a limit switchfor detecting an approach of the laser light sourceto a target portion T up to a predetermined distance and outputting a proximity signal, and an optical sensorsfor detecting a distance to the target portion T and outputting a distance signal S corresponding to the distance and is configured so that a reference value Lis set based on the distance signal S detected after the proximity signal is detected and emission of laser light by the laser light sourceis permitted in accordance with an amount of fluctuation of the distance signal S with respect to the reference value L

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Onomichi, Japan

Kazunori Takahashi