| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a configuration capable of surely realizing the turning-off of a light while securing the adjusting width of a light emitting circuit for detecting toner adhesion quantity by a reflection factor on a toner image. <P>SOLUTION: A light emitting means is composed of: a voltage-current conversion circuit for converting an input voltage signal into a current signal; a current mirror circuit for realizing the current signal in the voltage-current conversion circuit in another circuit having a light emitting element; and the light emitting element. <P>COPYRIGHT: (C)2007,JPO&INPIT |
