Element substrate for recording head, recording head, and recording apparatus
AssigneeCanon Kabushiki Kaisha
InventorKimiyuki Hayasaki
Life of this patent
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Abstract
The structure of a recording head and a control sequence of a recording apparatus that compensate for a change in a recording element characteristic due to a temperature change of the recording head without increasing the number of terminals of the recording head are provided. Devices for individually heating and controlling a plurality of sub-heaters on an element substrate of the recording head are arranged on an element substrate of the recording head, and digital control information for controlling these devices is inputted to the element substrate.
Claims11
A recording-head element substrate having a plurality of electrothermal converters arranged thereon in a row pattern, comprising:
- at least one element controlling application of electric current on the plurality of electrothermal converters;
- at least one common electrode energizing the plurality of electrothermal converters;
- at least one logic circuit selectively driving the plurality of electrothermal converters;
- a plurality of temperature-adjusting heating devices, the plurality of temperature-adjusting heating devices being different from the plurality of electrothermal converters;
- and
- at least one heat-controlling circuit individually controlling the plurality of temperature-adjusting heating devices,
- wherein control information for individually controlling the plurality of temperature-adjusting heating devices by the heat-controlling circuit is externally received via an input terminal and image information inputted to the logic circuit for selectively driving the electrothermal converters or information for controlling a time-division-drive of the row of the electrothermal converters is inputted via the same input terminal.
An inkjet recording head, comprising:
- a recording-head element substrate including at least one element controlling application of electric current on a plurality of electrothermal converters, at least one common electrode energizing the plurality of electrothermal converters, at least one logic circuit selectively driving the plurality of electrothermal converters, a plurality of temperature-adjusting heating devices, the plurality of temperature-adjusting heating devices being different from the plurality of electrothermal converters, and at least one heat-controlling circuit individually controlling the plurality of temperature-adjusting heating devices, wherein control information for individually controlling the plurality of temperature-adjusting heating devices by the heat-controlling circuit is externally received via an input terminal and image information inputted to the logic circuit for selectively driving the electrothermal converters or information for controlling a time-division-drive of the row of the electrothermal converters is inputted via the same input terminal;
- and
- a plurality of ink discharge ports arranged so as to correspond to the plurality of electrothermal converters and to discharge ink by driving corresponding recording heads.
A recording apparatus having an inkjet recording head mounted thereon, comprising:
- a recording head including at least one element controlling application of electric current on a plurality of electrothermal converters, at least one common electrode energizing the plurality of electrothermal converters, at least one logic circuit selectively driving the plurality of electrothermal converters, a plurality of temperature-adjusting heating devices, the plurality of temperature-adjusting heating devices being different from the plurality of electrothermal converters;
- and at least one heat-controlling circuit individually controlling the plurality of temperature-adjusting heating devices, wherein control information for individually controlling the plurality of temperature-adjusting heating devices by the heat-controlling circuit is externally received via an input terminal and image information inputted to the logic circuit for selectively driving the electrothermal converters or information for controlling a time-division-drive of the row of the electrothermal converters is inputted via the same input terminal;
- and
- a circuit outputting the control information to the recording head.
Dependencies are inferred from the claim text.