Pel placement correction in the scan dimension of a multiple...

Details Pel placement correction in the scan dimension of a multiple... Pel placement correction in the scan dimension of a multiple...

G - Physics

03

G

314/13

G03G 13/04 (2006.01) G06K 15/12 (2006.01) H04N 1/053 (2006.01) H04N 1/191 (2006.01) H04N 1/113 (2006.01) H04N 1/12 (2006.01)

Patent

CA 2018497

This is an electronic scheme for correcting mechanical misalignment and electrical delays from laser beam to laser beam in the scan direction of a multiple beam laser scanning system for use in an electrophotographic machine. The position at which a reference beam is turned on is sensed and adjusted to a desired position. Thereafter, the positions at which non-reference laser beams are turned on are sensed and adjusted to the desired position. In one embodiment, the energization of laser beams is posi? tioned at the trailing edge of the second element of a photodetector. In a second embodiment, the point of full laser energy is matched, beam to beam, at the junction of the same two elements in a CCD array. Programmable delay lines are used to obtain sub-pel resolution.

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