Light-emitting element array drive device, print head, image forming apparatus and signal supplying method
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United States of America Patent
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Sep 25, 2012
Grant Date -
Jun 24, 2010
app pub date -
Sep 1, 2009
filing date -
Dec 18, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A light-emitting element array drive device includes: plural light-emitting elements; plural switch elements electrically connected mutually in an array and respectively to the light-emitting elements, and setting the respective light-emitting elements ready to emit light when turned on, and unready to emit light when turned off; a transfer signal supply unit supplying transfer signals for getting the switch elements turned-on by sequentially switching each switch element from being turned-off to turned-on, and to turned-off, where periods during which the respective switch elements are turned on are displaced so that each two periods for two of the switch elements adjacently-connected overlap; and a light-emission signal supply unit supplying a light-emission signal having light-emitting periods for the light-emitting elements, where an end point of each light-emitting period is set based on a start point of the above overlap, while a start point thereof is set before each end point.
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