Ink jet recording apparatus and method of driving the same
AssigneeCanon Kabushiki Kaisha
InventorYuji Tsuruoka
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Abstract
In order to correct variations in the head temperature controlling due to variations in temperature sensing accuracy of a head temperature sensor, an ink jet recording apparatus and a method driving the same according to the present invention have pulse generating devices which can generate a plurality of signal trains of pulse widths corresponding to head temperature and devices for selecting a signal train in accordance with correction accuracy of an output of the head temperature sensor.
Claims18
An ink jet recording apparatus comprising:
- a recording head having a recording element for jetting ink and sensing means for sensing head temperature;
- pulse generating means which generates a pulse signal to be applied to said recording element of said recording head such that the pulse width of the pulse signal corresponds to the head temperature;
- and
- driving means for driving said recording element of said recording head by the pulse signal generated by said pulse generating means,
- wherein said pulse generating means is capable of generating a plurality of signal trains of pulse widths in accordance with the head temperature;
- and
- means for changing the signal train corresponding to correction accuracy of an output of said temperature sensing means of said recording head.
An ink jet recording apparatus comprising:
- sensing means for sensing temperature of a head;
- driving pulse storing means storing a plurality of driving pulse waveform data in accordance with each range of the head temperature;
- driving pulse generating means which reads driving pulse waveform data in accordance with head temperature from said driving pulse storing means to generate a driving pulse waveform;
- and
- driving means for driving said head corresponding to the driving pulse waveform data read by said driving pulse generating means,
- a plurality of said driving pulse storing means are provided to select desired driving pulse storing means corresponding to correction accuracy of a temperature characteristic of said sensing means for sensing head temperature.
An ink jet recording apparatus comprising:
- sensing means for sensing head temperature;
- driving voltage storing means storing a plurality of driving voltage data corresponding to each range of the head temperature;
- and
- driving voltage generating means which reads driving voltage data corresponding to a head temperature from said driving voltage storing means to generate a driving voltage,
- a plurality of said driving voltage storing means are provided to select desired driving voltage storing means corresponding to correction degrees of a temperature characteristic of said sensing means for sensing head temperature.
A method of driving an ink jet recording apparatus having a recording head including a recording element for jetting ink and sensing means for sensing head temperature, said driving method comprising the steps of:
- generating a pulse signal to be applied to said recording element such that the pulse width of the pulse signal corresponds to head temperature;
- driving said recording element of said recording head by the pulse signal;
- and
- generating a plurality of signal trains of pulse widths, each of said plurality of signal trains corresponding to a head temperature and selectable in accordance with correction accuracy of an output of said sensing means for sensing head temperature.
A method of driving an ink jet recording apparatus having a recording head including a recording element for jetting ink and sensing means for sensing head temperature, said driving method comprising the steps of:
- generating a driving voltage to be applied to said recording element such that the magnitude of the driving voltage corresponds to head temperature;
- driving said recording element of said recording head by the driving voltage;
- and
- generating a plurality of signal trains of different voltage magnitudes, each of said plurality of signal trains corresponding to a head temperature, and selectable in accordance with correction accuracy of said sensing means for sensing head temperature.
Dependencies are inferred from the claim text.