Incremental printing of symbolic information – Ink jet – Controller
Reexamination Certificate
2006-05-23
2006-05-23
Nguyen, Thinh (Department: 2861)
Incremental printing of symbolic information
Ink jet
Controller
C347S014000, C347S017000
Reexamination Certificate
active
07048351
ABSTRACT:
Provided is a temperature detection method capable of more accurately acquiring an environmental temperature and more accurately correcting temperature detection of a printhead. In a printing apparatus to which this method is applied, a previous printing time when the printhead has performed a printing operation is stored in a nonvolatile memory. The current time is acquired using a timer which always performs a time counting operation by power supply from an auxiliary power supply capable of supplying power independently of a main power supply that supplies power for performing the printing operation by the printing apparatus. A time elapsed after the previous printing time is calculated on the basis of the current time and previous printing time. The elapsed time and a predetermined time are compared. The temperature is measured using a sensor arranged in at least one of the printing apparatus and the printhead in accordance with the comparison result. A temperature is updated on the basis of the measured temperature.
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Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Goldberg Brian J.
Nguyen Thinh
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