| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable to perform droop correction by an intermediate tone image data to a sudden change of droop characteristics of a laser diode, and to enable to execute the droop correction in accordance with the droop characteristics inherent to the laser diode. <P>SOLUTION: When a correction for repairing the change in light volume caused by self-generation of heat actualized in a pulse signal when the laser diode LD is driven is made to be the droop correction, a controlling means 51 for controlling a range for the droop correction corresponding to the droop characteristics of the laser diode, a droop correcting means 54 for detecting continuity of one line of image data Din ahead of recording an image by making the droop correction range set here as a reference, and for performing the droop correction on every one line scanning of the image data Din, a modulating means 43 for modulating the pulse width of the droop-corrected image data Dout, and a driving means 44 for driving the laser diode based on the pulse signal Sout whose pulse width is modulated here, are provided. <P>COPYRIGHT: (C)2007,JPO&INPIT |
