Temperature detection circuit for recording head and recording device therewith
AssigneeCanon Kabushiki Kaisha
InventorYoshiaki Takayanagi
Life of this patent
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Abstract
A recording head performing recording with thermal energy and having a temperature sensor. The sensor measures the temperature of the recording head with minimal susceptibility to common mode noise. The sensor includes a p-n junction of a semiconductor provided inside the recording head. Temperature detection is performed by converting a first voltage value at a P-side portion of the sensor and a second voltage value at a N-side portion of the sensor into respective digital data. A difference data of the respective digital data is calculated. Based on the difference data, the temperature of the recording head can be determined.
Claims12
A recording device having a recording head operable to perform recording using thermal energy, the recording device comprising:
- a sensor having a p-n junction of a semiconductor and being disposed inside the recording head, wherein the p-n junction includes a P-side portion and a N-side portion;
- an analog/digital converter converting a first voltage value at the P-side portion into a first digital data and converting a second voltage value at the N-side portion into a second digital data;
- and
- a difference calculator calculating a difference data of the first and second digital data.
A temperature detection circuit of a recording head that performs recording using thermal energy, the temperature detection circuit comprising:
- a function element having a p-n junction of a semiconductor and being disposed inside the recording head, the p-n junction having a P-side portion and a N-side portion;
- an analog/digital converter converting a first voltage value at the P-side portion into a first digital data and converting a second voltage value at the N-side portion into a second digital data;
- difference acquisition means for determining a difference data of first and second digital data;
- and
- temperature determining means for determining a temperature of the recording head based on the difference data.
A method for measuring a temperature of a recording head that uses thermal energy to perform recording, the method comprising the following steps:
- providing a sensor having a p-n junction of a semiconductor, wherein the p-n junction includes a P-side portion and a N-side portion;
- digitally converting a first voltage value at the P-side junction into a first digital data;
- digitally converting a second voltage value at the N-side portion into a second digital value;
- calculating a difference data of the first and second data;
- and
- determining the temperature of the recording head based on the difference data.
Dependencies are inferred from the claim text.