| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the light quantity adjustment precision in light quantity control of emission beam. <P>SOLUTION: Small emission power P<SB POS="POST">1</SB>and large emission power P<SB POS="POST">2</SB>are set as measurement points of emission power of a laser beam light source. Monitor voltages Vpd<SB POS="POST">1</SB>and Vpd<SB POS="POST">2</SB>measured at the two measurement points are made to correspond to the emission powers P<SB POS="POST">1</SB>and P<SB POS="POST">2</SB>. Each light quantity is stored for every channel ch of a light emitting element. The emission power P<SB POS="POST">1</SB>is set as the lower limit of the light quantity control range of a laser beam light source. The emission power P<SB POS="POST">2</SB>is set as the upper limit of the light quantity control range of the laser beam light source. The relational expression of emission power of the laser beam light source and monitor voltage Vpd is created using the emission power P<SB POS="POST">1</SB>, the emission power P<SB POS="POST">2</SB>, and the monitor voltages Vpd<SB POS="POST">1</SB>and Vpd<SB POS="POST">2</SB>measured at the two measurement points. The emission power of the laser beam light source is controlled such that the monitor voltage Vpd predicted using the relational expression is obtained. <P>COPYRIGHT: (C)2012,JPO&INPIT |
