| 摘要 |
PURPOSE:To enable two power sources from being shielded by opening a single interlocking switch, by a method wherein a relay is operated by opening a single interlocking switch, thereby simultaneously shielding two DC power sources for an operational amplifier. CONSTITUTION:A power source of +12V and a power source of -12V are connected to the operational amplifier 15 (which is connected to a semiconductor laser 11 and a driving element 12) through switching parts 13a, 13b of the relay 13. The interlocking switch 14 which is opened when a cover for the laser printer is opened is provided, by which the relay 13 is operated. |
