Light beam scanning apparatus for reading out or recording an im

Details Light beam scanning apparatus for reading out or recording an im Light beam scanning apparatus for reading out or recording an im

1984-12-27

1987-10-13

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250235, H01J 516

Patent

active

047000660

ABSTRACT:
In a light beam scanning apparatus, two photodetectors are positioned in spaced relation by a predetermined distance within a scanning region in a main scanning direction. The start and the end of scanning in the main scanning direction are detected by the photodetectors. The scanning speed of a main scanning means is controlled so that a predetermined number of pulses of a pulse signal having a predetermined period are input within the time between the start and the end of scanning in the main scanning direction. Or, a single photodetector is positioned within the scanning region, and the scanning time from the start of scanning to the photodetector is detected by use of the photodetector. The initial position of scanning is controlled so that a predetermined number of pulses of the pulse signal having a predetermined period are input within the scanning time.

REFERENCES:
patent: 4350988 (1982-09-01), Masegi

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