Incremental printing of symbolic information – Ink jet – Controller
Reexamination Certificate
2007-04-10
2007-04-10
Huffman, Julian D. (Department: 2853)
Incremental printing of symbolic information
Ink jet
Controller
C347S060000
Reexamination Certificate
active
10991930
ABSTRACT:
An apparatus for controlling a temperature of an ink-jet printhead includes a heater driving field effect transistor (FET) connected to a heater, the heater driving FET for applying a heater voltage to the heater according to a waveform input to a gate of the heater driving FET, a current sensor for converting current flowing between a drain and a source of the heater driving FET into a voltage and for outputting the voltage, a comparator for comparing the voltage output from the current sensor with a predetermined reference voltage, a warming control signal generator for generating a warming control signal in a form of a pulse string, and a switching unit for receiving an output signal from the comparator and the warming control signal, and for outputting the warming control signal according to a level of the output signal from the comparator to the gate of the heater driving FET.
REFERENCES:
patent: 4590362 (1986-05-01), Ishima
patent: 5815180 (1998-09-01), Barbour et al.
patent: 6286924 (2001-09-01), Ahne et al.
patent: 2002/0067384 (2002-06-01), Anderson et al.
patent: 0 658 429 (1995-06-01), None
Kim Young-jae
Kuk Keon
Oh Yong-soo
Huffman Julian D.
Lee & Morse P.C.
Samsung Electronics Co,. Ltd.
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