| 摘要 |
In the optical information recording apparatus, the form slide film having the sensor mark is two-dimensionally scanned so as to detect the drift amount in the vertical scanning direction due to the fluctuation of the optical system of the optical information recording apparatus. The scanning device scans the sensor mark within a predetermined scanning period to produce the pulse signals. The number of these pulse signals is counted and then compared with the reference number so as to produce a difference, i.e., the drift amount. The vertical scanning pitch of the scanning device is controlled based upon the drift amount.
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