Recording method and apparatus maintaining constant density by anticipating temperature changes in the recording head
AssigneeCanon Kabushiki Kaisha
InventorYouichi Watanabe
Life of this patent
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Abstract
A recording apparatus includes a heat generating element which is driven to generate heat and thereby effect image recording on a recording medium. In the apparatus, a reference voltage for driving the heat generating element is set, and a driving voltage based on the reference voltage is output. A signal is detected which corresponds to an amount of electric power supplied to the heat generating element during image recording. A control unit controls the outputting of the driving voltage based on the amount of electric power, and adjusts the energy to be applied to the heat generating element.
Claims45
A recording apparatus in which a heat generating element at a recording means for recording generates heat and thereby effects image recording on a recording medium, comprising:
- setting means for setting a reference voltage for driving said heat generating element to generate heat;
- voltage outputting means for outputting a driving voltage of said heat generating element based on said reference voltage;
- detecting means for detecting a signal corresponding to an amount of an electric power supplied to said heat generating element during said image recording;
- accumulating means for accumulating said a value based on said signal corresponding to said amount of said electric power in a predetermined time period;
- and
- control means for anticipating a temperature change of said recording means in accordance with said value and controlling said voltage outputting means to adjust an energy to be applied to said heat generating element.
A recording method in which a heat generating element at a recording means for recording generates heat and thereby effects image recording on a recording medium, comprising the steps of:
- setting a reference voltage to cause said heat generating element to generate heat;
- detecting a current supplied to said heat generating element during image recording;
- accumulating a value based on said current detected in said detecting step in a predetermined time period;
- anticipating a temperature change of said recording means in accordance with said value accumulated in said accumulating step and
- outputting a driving voltage of said heat generating element in accordance with the temperature change anticipated in said anticipating step so as to control an energy to be applied to said heat generating element.
A recording apparatus in which a heat generating element at a recording means for recording generates heat and thereby effects image recording on a recording medium, comprising:
- setting means for setting a reference voltage for driving said heat generating element to generate heat;
- voltage outputting means for outputting a driving voltage of said heat generating element on the basis of said reference voltage;
- detecting means for detecting a current supplied to said heat generating element during image recording;
- accumulating means for accumulating a value based on said detected current in a predetermined time period;
- and
- control means for anticipating a temperature change of said recording means in accordance with a value of said value and controlling said voltage outputting means to adjust an energy to be applied to said heat generating element.
A recording method in which a heat generating element at a recording means for recording generates heat and thereby effects image recording on a recording medium, comprising the steps of:
- setting a reference voltage to cause said heat generating element to generate heat;
- accumulating a value based on an electric power supplied to said heat generating element in a predetermined time period;
- anticipating a temperature change of said recording means in accordance with said value accumulated in said accumulating step;
- and
- outputting a driving voltage of said heat generating element in accordance with the temperature change anticipated in said anticipating step so as to control an energy to be applied to said heat generating element.
A recording apparatus in which a heat generating element at a recording means for recording generates heat and thereby effects image recording on a recording medium, comprising:
- setting means for setting a reference voltage for driving said heat generating element to generate heat;
- voltage outputting means for outputting a driving voltage of said heat generating element based on said reference voltage;
- detecting means for detecting a voltage supplied to said heat generating element during image recording;
- and
- control means for anticipating a temperature change of said recording means in accordance with said voltage detected by said detecting means and producing a pulse signal in conformity with a voltage value of said driving voltage, and controlling a level of the driving voltage by said pulse signal.
A recording method in which a heat generating element at a recording means for recording generates heat and thereby effects image recording on a recording medium, comprising the steps of:
- setting a reference voltage to cause said heat generating element to generate heat;
- detecting a current supplied to said heat generating element during image recording;
- accumulating a value based on said current detected in said detecting step in a predetermined time period;
- anticipating a temperature change of said recording means in accordance with the value accumulated in said accumulating step;
- determining an electric power amount to be applied to said heat generating element in response to the temperature change anticipated in said anticipating step;
- generating a pulse signal for driving said heat generating element;
- outputting a driving voltage in accordance with said pulse signal so as to apply electric power to said heat generating element;
- and
- controlling said driving voltage in accordance with said reference voltage so as to apply to said heat generating element the electric power amount determined in said determining step.
A recording apparatus for recording on a recording medium, comprising:
- head means for recording having a heat generating element;
- voltage output means for outputting a drive voltage for driving said heat generating element so as to apply energy to said heat generating element to generate heat in response to a reference voltage;
- accumulating means for accumulating a voltage amount of voltage in a predetermined time period to be supplied to said heat generating element as electric power during recording;
- detecting means for detecting the voltage amount accumulated by said accumulating means;
- and
- control means for controlling the energy applied to said heat generating element by anticipating a temperature change in said head means in response to the voltage amount.
A recording apparatus in which a heat generating element at a recording means for recording generates heat and thereby effects image recording on a recording medium, said apparatus comprising:
- setting means for setting a reference signal used in driving said heat generating element to generate heat;
- driving signal outputting means for outputting a driving signal of said heat generating element based on said reference signal;
- detecting means for detecting a signal corresponding to said driving signal supplied to said heat generating element during the image recording;
- accumulating means for accumulating a value based on said signal detected by said detecting means in a predetermined time period;
- and
- control means for anticipating a temperature change of said recording means in accordance with said value and controlling said driving signal outputting means to adjust an energy to be applied to said heat generating element.
A recording method in which a heat generating element at a recording means for recording generates heat and thereby effects image recording on a recording medium, said method comprising the steps of:
- setting a reference signal to cause said heat generating element to generate heat;
- detecting a signal corresponding to a driving signal supplied to said heat generating element during the image recording;
- accumulating a value corresponding to said driving signal detected in said detecting step in a predetermined time period;
- anticipating a temperature change of said recording means in accordance with said value accumulated in said accumulating step;
- and
- outputting said driving signal of said heat generating element in accordance with the temperature change anticipated in said anticipating step so as to control an energy to be applied to said heat generating element.
A recording method using a heat generating element, said method comprising the steps of:
- supplying a driving signal for driving said heat generating element to said heat generating element;
- detecting a signal based on said driving signal;
- accumulating a value based on said signal detected in said detecting step in a predetermined time period;
- and
- adjusting said driving signal in accordance with said value.
Dependencies are inferred from the claim text.