Recording-head substrate, recording head, and recording apparatus
AssigneeCanon Kabushiki Kaisha
InventorTatsuo Furukawa
Life of this patent
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Abstract
A recording-head substrate including a recording element, a driving circuit for driving the recording element, a temperature-detecting element for measuring the temperature of the recording-head substrate by outputting at least one of a maximum output voltage and a minimum output voltage, a first detection circuit for detecting the maximum output voltage from the temperature-detecting element, a second detection circuit for detecting the minimum output voltage from the temperature-detecting element, and first and second output terminals coupled to the first and second detection circuits for outputting the maximum and minimum output voltages respectively.
Claims4
A recording head comprising:
- (A) a plurality of recording-head substrates, wherein each recording-head substrate comprises:
- a recording element;
- a driving circuit driving the recording element;
- a temperature-detecting element measuring a temperature of the recording-head substrate, the temperature-detecting element outputting at least one of a first signal corresponding to a first temperature and a second signal corresponding to a second temperature;
- a first detection circuit detecting the first signal from the temperature-detecting element;
- a second detection circuit detecting the second signal from the temperature-detecting element;
- a first output terminal coupled to the first detection circuit to output the first signal from the first detection circuit;
- and
- a second output terminal coupled to the second detection circuit to output the second signal from the second detection circuit;
- (B) a first output pad coupled to the first output terminals of the plurality of recording-head substrates, the first output pad outputting a first output signal corresponding to a maximum one of the first signals from the first output terminals;
- and
- (C) a second output pad coupled to the second output terminals of the plurality of recording-head substrates, the second output pad outputting a second output signal corresponding to a minimum one of the second signals from the second output terminals.
A recording apparatus comprising:
- a recording head outputting a signal;
- and
- a control unit executing a control responsive to the signal from the recording head;
- the recording head including a plurality of recording-head substrates, wherein each of the recording-head substrates comprises:
- a plurality of recording elements;
- a driving circuit driving the recording elements;
- a temperature-detecting element measuring a temperature of the recording-head substrate, the temperature-detecting element outputting at least one of a first signal and a second signal;
- a first detection circuit detecting the first signal from the temperature-detecting element;
- a second detection circuit detecting the second signal from the temperature-detecting element;
- a first output terminal coupled to the first detection circuit to output the first signal from the first detection circuit;
- and
- a second output terminal coupled to the second output terminal to output the second signal from the second detection circuit;
- the recording head further including:
- a first output pad coupled to the first output terminals of the plurality of recording-head substrates to output a first output signal corresponding to a maximum one of the first signals from the first output terminals;
- and
- a second output pad coupled to the second output terminals of the plurality of recording-head substrates to output a second output signal corresponding to a minimum one of the second signals from the second output terminals.
Dependencies are inferred from the claim text.