| 摘要 |
PURPOSE:To obtain a stable picture with no deterioration of picture quality at each page by providing a laser light intensity control means controlling the luminous intensity of a laser light to a prescribed level just before recording is started at each recording page. CONSTITUTION:When a laserlight of a semiconductor laser 1 is made incident to a luminous intensity detector 16, a luminous intensity signal 22 is obtained. A comparison amplifier 18 compares it with a reference voltage VS and controls a drive bias voltage VB so as to make the luminous intensity signal 22 eqaul to the reference voltage VS. A control timing signal 23 keeps a switch SW1 to the conductive state until this control is applied. The bias voltage VB is stored for its voltage value in a capacitor C1 for a prescribed period even if the control timing signal 23 is turned off and a switch SW1 is interrupted so as to keep the output of the laser light 1 constant. The luminous intensity detector 16 is provided in the inside or fitted on the scanning line turnably.
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