Printing head, printing method and apparatus using same, and apparatus and method for correcting said printing head
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United States of America Patent
Stats
-
Jun 25, 2002
Grant Date -
Jan 3, 2002
app pub date -
Jun 16, 1999
filing date -
Mar 4, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A printing head has a plurality of heater boards, each of which includes a shift register to which printing data and selection data for selecting preheating pulse signals are applied as inputs, a latch circuit for latching the printing data, a selection-data latch circuit for latching the selection data, a selection circuit for selecting any one of a plurality of preheating pulse signals inputted in accordance with the latched selection data, and a plurality of heating resistors driven by the printing data or preheating pulse signals. Correction data, obtained by a head correcting apparatus, for performing printing at an average density by correcting the characteristics of each heater board is stored in a memory of the printing head. A printing apparatus decides the selection data in accordance with the correction data and sets the selection data in the selection-data latch circuit.
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