| 摘要 |
PURPOSE:To enable an accurate feedback of quantity of light to be achieved for each luminous point by equally dividing according to the number of luminous points after one effective scanning is completed in laser scanner and by allowing each luminous point to blink in sequence to monitor the quantity of light by a photodetector for monitoring the quantity of light. CONSTITUTION:When writing of image is completed by the LDA1, laser rays are detected by an EOS(end of scan) sensor 24 which is located at the outer edge of image part. Then, writing is completed, namely 'scanning invalid tie start' is recognized and pulse is generated. When an one-shot multi-vibrator 26 detects the leading edge of this pulse, it emits lighting signal for the monitoring time of quantity of light of the first luminous point 1-1 and allows for lighting through a driver 21 of the first luminous point 1-1. The pulse width of a multi-vibrator 28 is set to a large value which is sufficient for detecting the SOS(stator of scan) and is cleared when a SOS signal 29 is emitted from a SOS sensor 25. Then, a video circuit 30 sends blinking signal being based on image information to each driver 21-23, each luminous point 1-1-1-3 emits light, and writing is performed. |
