Patent ID: 7048351
Filing Date: 2006-05-23
Classification: B41J

Abstract:
1. A temperature detection method of a printing apparatus which prints by using a printhead, comprising: a storage step of storing, in a nonvolatile memory, a previous printing time when the printhead has performed a printing operation; a time acquisition step of acquiring a current time by 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 calculation step of calculating a time elapsed after the previous printing time on the basis of the current time and the previous printing time; a comparison step of comparing the elapsed time and a predetermined time; a measurement step of measuring a temperature by using a sensor arranged in at least one of the printing apparatus and the printhead in accordance with the comparison result at said comparison step; an update step of updating a temperature on the basis of the measured temperature; and a determination step of determining whether or not the printhead has been exchanged, wherein a temperature correction value of the printhead is so controlled as to be updated in accordance with the determination result at said determination step.