Temperature detection method and printing apparatus using the same

A printing apparatus which prints by using a printhead, comprising:

• a nonvolatile memory which stores a previous printing time when the printhead has performed a printing operation;
• 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 said printing apparatus;
• time acquisition means for acquiring a current time by using said timer;
• calculation means for calculating a time elapsed after the previous printing time on the basis of the current time acquired by said time acquisition means and the previous printing time stored in said nonvolatile memory;
• comparison means for comparing the elapsed time and a predetermined time;
• measurement means for measuring a temperature by using a sensor arranged in at least one of said printing apparatus and the printhead in accordance with the comparison result of said comparison means;
• and
• update means for updating a temperature on the basis of the measured temperature.

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 an absolute current time;
• a calculation step of calculating a time elapsed after the previous printing time on the basis of the absolute 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 in said comparison step;
• and
• an update step of updating a temperature on the basis of the measured temperature.

A printing apparatus which prints by using a printhead, comprising:

• a nonvolatile memory which stores a previous printing time when the printhead has performed a printing operation;
• time acquisition means for acquiring an absolute current time;
• calculation means for calculating a time elapsed after the previous printing time on the basis of the absolute current time acquired by said time acquisition means and the previous printing time stored in said nonvolatile memory;
• comparison means for comparing the elapsed time and a predetermined time;
• measurement means for measuring a temperature by using a sensor arranged in at least one of said printing apparatus and the printhead in accordance with a comparison result by said comparison means;
• and
• update means for updating a temperature on the basis of the measured temperature.