Incremental printing of symbolic information – Thermal marking apparatus or processes – Having driving circuitry for recording means
Reexamination Certificate
2011-01-11
2011-01-11
Tran, Huan H (Department: 2861)
Incremental printing of symbolic information
Thermal marking apparatus or processes
Having driving circuitry for recording means
Reexamination Certificate
active
07868907
ABSTRACT:
A thermal head driving IC for supplying voltage to a plurality of heating resistors each controlled by a driving MOS transistor includes a switch for making and breaking electrically between a substrate and a source of the plurality of driving MOS transistors. In a case where the plurality of heating resistors are activated, the plurality of driving MOS transistors are turned on and the switch is turned off, whereby the substrate potential is floated. As a result, the substrate potential is forward-biased against the source by a substrate current generated in a high-electric-field depletion region near the drain, and a parasitic bipolar transistor turns on, whereby both the plurality of driving MOS transistors and the parasitic bipolar transistor turn on. In a case where the plurality of heating resistors are not activated, a signal for turning off the plurality of driving NMOS transistors is given, and the switch is turned on.
REFERENCES:
patent: 4132865 (1979-01-01), Szechenyi
patent: 6771109 (2004-08-01), Nakase
patent: 2004015402 (2004-01-01), None
Akamine Tadao
Omi Toshihiko
Adams & Wilks
Seiko Instruments Inc.
Tran Huan H
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