Method of detecting a drift amount in two-dimensionally scanning

Details Method of detecting a drift amount in two-dimensionally scanning Method of detecting a drift amount in two-dimensionally scanning

1985-11-26

1987-11-17

Goldberg, E. A.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

358296, G01D 942, H04N 121

Patent

active

047077107

ABSTRACT:
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.

REFERENCES:
patent: 4323906 (1982-04-01), Ohnishi

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