| 摘要 |
<p>PURPOSE: To restrain irregularity in light quantities of light emitting elements, facilitate adjustment of the light quantities of the light emitting elements, automatically adjust the light quantities of the light emitting elements, prevent local deterioration of a photosensitive body, and facilitate control of temperature property. CONSTITUTION: After data are stored in a latch circuit 23, analog switches S31 -S3n are turned on/off by the data in the latch circuit 23 and a lighting signal so as to make light emitting elements S21 -S2n emit light correspondingly to the data in the latch circuit 23. Bypass circuits 251 -25n respectively feed electric current when the analog switches S31 -S2n are turned off.</p> |
