| 摘要 |
<P>PROBLEM TO BE SOLVED: To make an opening time of a shutter member shorter than ever before. <P>SOLUTION: Calibration means performs for each of various types of photosensors: a first calibration process for adjusting an amount of luminescence of LED so that a background regular reflection voltage has a predetermined value; and a second calibration process in which a shutter member is closed and light emitted from LED under the condition of the amount of luminescence after a calibration performed by the first calibration process is reflected on a rear surface of the shutter member, a combination with a signal storage process for causing a rear surface reflection voltage output at that time to be stored in an RAM is periodically performed, and between those periodical timings, the amount of luminescence is adjusted so that a rear surface reflection voltage is brought to the same value as the rear surface reflection voltage stored in the RAM. <P>COPYRIGHT: (C)2012,JPO&INPIT |
