Konica Minolta, Inc.

Konica Corporation

Konica Minolta Ij Technologies, Inc.

Junichirou Akune

Hisashi Yonekawa

Yoshiyuki Ishimitsu

Kumiko Furuno

An inkjet head includes a plurality of driving circuits, and ejecting ink in accordance with driving operation of the plurality of driving circuits based on a predetermined setting, wherein the plurality of driving circuits include a first driving circuit, and a second driving circuit electrically connected with the output of the first driving circuit, the first driving circuit includes a first storage unit, and a first setting output unit, and the second driving circuit includes a second storage unit, a second setting input unit, a second comparison unit, and a second result output unit.

Inkjet head and inkjet recording apparatus

A driving waveform has a first driving waveform (PLSTM1) composed of non-GND waveform, a second driving waveform (PLSTM2) composed of a non-GND waveform different from the first driving waveform, and a third driving waveform (PLSTM0) composed of a GND waveform, and a driving voltage Vof the first driving waveform and a driving voltage Vof the second driving waveform is |V|&#x3e;|V|; and the driving circuit selects at least the first driving waveform and the second driving waveform or only the first driving waveform at every predetermined time in 1 pixel cycle in accordance with the discharge data, applies this to one of the two driving electrodes of the pressure generating unit and also applies only the second driving waveform to the other so as to operate the pressure generating unit by a differential waveform between the two driving electrodes.

Ink-jet recording apparatus

An image data compression apparatus, in that a component characteristic value of an AC component in a block obtained by dividing digital tonal image data is compared with a predetermined threshold value so that a frequency of an AC component at the highest frequency side having the component characteristic value over the threshold value is determined as a boundary value, and in that the AC component exceeding the boundary value is not handled as a substantial transform coefficient. When the transform coefficients in a high-frequency side in the block is cut according to an image content of the block a lower limit of a frequency to be cut is determined, so that a frequency lower than the lower limit determined may not be cut.

Growing community of inventors

Sagamihara, Japan

Junichirou Akune