| 摘要 |
PURPOSE:To prevent the accuracy of timing signal from lowering even when the noise of high tension alternating voltage mixes in a light beam position detecting apparatus in a picture forming equipment. CONSTITUTION:By receiving the light beam deflectingly scanned with a scanning device 20, a light beam position detecting apparatus issues the reading timing signal of picture signal in order to form electrostatic latent image on a photosensitive drum 30 by light beam. Further, a synchronous circuit 60 outputs clock signal, which synchronized with the timing signal, to a high tension circuit 70 so as to produce high tension alternating voltage necessary for developing in synchronization with the timing signal by the high tension circuit 70, resulting in staggering the timing for reversing the polarity of the high tension alternating voltage and the timing signal detected by the light beam position detecting apparatus each other at all times and no overlapping of timing occurs. |
