| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce a space of this device and to simplify the structure by attaching a sensor which is shared for different purposes such as synchronization and correction of quantity of light for image recording. SOLUTION: A photosensor 228 is connected to a signal selecting section 10. Signals therefrom are selectively divided by the signal selecting section 10 into a reference position signal indicative of a scanning start position of a light source unit 200 and a light quantity signal that is based on the quantity detected by the photosensor 228. The reference position signal is supplied to a reset output section 12 and a pulse signal for a stepping motor 226 is reset by the reset output section 12. The light quantity signal selected by the signal selecting section 10 is supplied to a comparing section 16. A constant signal for correction is inputted to the comparing section 16, then the constant signal for correction and light quantity signal are compared with each other.</p> |
