Driving device for inkjet recording apparatus and inkjet recording apparatus using the same

A driving device for an inkjet recording apparatus for supplying AC signals to a plurality of piezoelectric elements for injecting liquid ink from at least one of said piezoelectric elements to form an image, comprising:

• a group of piezoelectric elements including a plurality of piezoelectric element row banks having said plurality of piezoelectric elements arranged in a row for providing a matrix of said plurality of piezoelectric elements;
• a plurality of switching means, each provided for a respective corresponding row bank of piezoelectric elements, for switching said AC signals including image signals of said image in order to inject liquid ink from said piezoelectric elements;
• a plurality of amplifier means each connected to a respective corresponding row bank of piezoelectric elements and each provided between said group of piezoelectric elements and said switching means, for amplifying said AC signals;
• and
• a plurality of adjusting means, each for adjusting the resonant frequency in response to the fluctuation of capacitive load of a respective corresponding row bank of piezoelectric elements to regulate the resonant frequency to a predetermined value.

A driving device for an inkjet recording apparatus for supplying AC signals to a plurality of piezoelectric elements for injecting liquid ink from at least one of said piezoelectric elements to form an image, comprising:

• an inductance connected in parallel to said plurality of piezoelectric elements;
• switching control means for controlling the injection of liquid ink by switching on and off the connection between said plurality of piezoelectric elements and said AC signals in response to input signals;
• and
• adjusting means for adjusting the resonant frequency in response to the fluctuation of capacitive load of said plurality of piezoelectric elements to regulate the resonant frequency to a predetermined value.

A driving device for an inkjet recording apparatus for supplying AC signals to a plurality of piezoelectric elements for injecting liquid ink from at least one of said piezoelectric elements to form an image, comprising:

• an inductance connected in parallel to said plurality of piezoelectric elements for forming a tuning resonant circuit;
• first switching means for controlling the connection between said plurality of piezoelectric elements and said AC signals;
• a resonant circuit connected in parallel to said first switching means;
• second switching means for controlling the supply of said AC signals to said resonant circuit;
• and
• controller means for controlling the injection of said liquid ink by causing said second switching means to be iteratively repeated on and off in response to the input signal.

An inkjet recording apparatus comprising a driving device for supplying AC signals to a plurality of piezoelectric elements for injecting liquid ink from at least one of said piezoelectric elements to form an image, said driving device comprising:

• a group of piezoelectric elements including a plurality of piezoelectric element row banks having said plurality of piezoelectric elements arranged in a row for providing a matrix of said plurality of piezoelectric elements;
• a plurality of switching means, each provided for a respective corresponding row bank of piezoelectric elements, for switching said AC signals including image signals of said image in order to inject liquid ink from said piezoelectric elements;
• a plurality of amplifier means each connected to a respective corresponding row bank of piezoelectric elements and each provided between said group of piezoelectric elements and said switching means, for amplifying said AC signals;
• and
• a plurality of adjusting means, each for adjusting the resonant frequency in response to the fluctuation of capacitive load of a respective corresponding row bank of piezoelectric elements to regulate the resonant frequency to a predetermined value.

An inkjet recording apparatus comprising a driving device for an inkjet recording apparatus for supplying AC signals to a plurality of piezoelectric elements for injecting liquid ink from at least one of said piezoelectric elements to form an image, said driving device comprising:

• an inductance connected in parallel to said plurality of piezoelectric elements;
• switching control means for controlling the injection of liquid ink by switching on and off the connection between said plurality of piezoelectric elements and said AC signals in response to input signals;
• and
• adjusting means for adjusting the resonant frequency in response to the fluctuation of capacitive load of said plurality of piezoelectric elements to regulate the resonant frequency to a predetermined value.

An inkjet recording apparatus comprising a driving device for supplying AC signals to a plurality of piezoelectric elements for injecting liquid ink from at least one of said piezoelectric elements to form an image, said driving device comprising:

• an inductance connected in parallel to said plurality of piezoelectric elements for forming a tuning resonant circuit;
• first switching means for controlling the connection between said plurality of piezoelectric elements and said AC signals;
• a resonant circuit connected in parallel to said first switching means;
• second switching means for controlling the supply of said AC signals to said resonant circuit;
• and
• controller means for controlling the injection of said liquid ink by causing said second switching means to be iteratively repeated on and off in response to the input signal.

A driving device for an inkjet recording apparatus for supplying AC signals to a plurality of piezoelectric elements for injecting liquid ink from at least one of said piezoelectric elements to form an image, comprising:

• a group of piezoelectric elements including a plurality of piezoelectric element row banks having said plurality of piezoelectric elements arranged in a row for providing a matrix of said plurality of piezoelectric elements;
• a plurality of switching means, each provided for a respective corresponding row bank of piezoelectric elements, for switching said AC signals including image signals of said image in order to inject liquid ink from said piezoelectric elements;
• and
• a plurality of amplifier means each connected to a respective corresponding row bank of piezoelectric elements and each provided between said group of piezoelectric elements and said switching means, for amplifying said AC signals,
• wherein each of the switching means includes
• a first transistor and a second transistor, each of which includes a control input terminal, a first terminal and a second terminal,
• wherein the first terminals of the first and the second transistors are connected in common as output, the second terminal of the first transistor is connected to a first potential, the second terminal of the second transistor is connected to a second potential, the first transistor amplifies the AC signals inputted into the control input terminal, and the second transistor switches to enable or disable the first transistor by selection signals that are inputted into the control input terminal and select the row bank of piezoelectric elements.