| 摘要 |
PROBLEM TO BE SOLVED: To surely turn a current outputted, when LED drive is off, to be 100μA or lower. SOLUTION: A first transistor for interruption is serially connected to a differential circuit and to a constant-current source transistor, the first transistor for the interruption is interrupted, when the LD drive is off, and an operating current supplied from the constant-current source transistor is interrupted. COPYRIGHT: (C)2007,JPO&INPIT
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