| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To configure such a circuit that can always obtain stable output current and to obtain a highly precise modulated light of an LED, in a current output circuit of large gain. <P>SOLUTION: A current generation circuit for generating driving current is configured in a manner to generate both light source driving current and its reversed polarity current, and the reversed polarity current is used to control a current value of the current generation circuit so that the reversed polarity current may always become constant current. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
