Ink-jet head driving device
AssigneeToshiba Tec Kabushiki Kaisha
InventorsJun Takamura, Noboru Nitta, Shunichi Ono
Life of this patent
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Abstract
In an ink-jet head driving device, data of a shift register is latched by a latch circuit. The data latched by the latch circuit is input to energization signal selection circuits. At this time, each selection circuit receives 1-bit data for operating a corresponding ink chamber, and 2-bit data for operating adjacent ink chambers as reference data. Each selection circuit selects one from energization signals using the 3-bit data, and supplies the selected energization signal to a corresponding head driver, thereby generating a drive waveform for driving the ink chamber.
Claims13
An ink-jet head driving device for an ink-jet head having a line of ink chambers, comprising:
- a reception unit which receives dot data corresponding to each ink chamber of the print head;
- a decoding unit which selectively decodes (j+k)-bit data, where j is a first positive integer and k is a second positive integer, made up of received j-bit dot data of a target ink chamber and k-bit dot data of neighboring ink chambers;
- an input unit which inputs a plurality of externally produced energization signals;
- and
- a selection unit which selects one energization signal from the plurality of energization signals based on a result of the decoding and drives the target ink chamber with a waveform obtained by the selected energization signal and ejects ink from the target ink chamber.
An ink-jet head driving device for an ink-jet head having a line of ink chambers, comprising:
- a reception unit which receives dot data corresponding to each ink chamber of the print head;
- a decoding unit which selectively decodes (j+k)-bit data made up of received j-bit dot data (j≧1) of a target ink chamber and k-bit dot data (k≧1) of neighboring ink chambers;
- an input unit which inputs a plurality of energization signals;
- and
- a selection unit for selecting one energization signal from the plurality of energization signals;
- wherein the selection unit is arranged to determine an energization signal to be selected based on a decoding result of the decoding and to drive the target ink chamber with a waveform obtained by the energization signal selected thereby;
- and
- wherein when printing of one line completes, and said multiple n-bit parallel shift registers newly receive parallel dot data for printing of a next one line, dummy data is added to the serial dot data so as not to leave previous dot data in said n-bit parallel shift registers.
An ink-jet head driving device for an ink-jet head having a line of ink chambers, comprising:
- a reception unit which receives dot data corresponding to each ink chamber of the print head;
- a decoding unit which selectively decodes (j+k)-bit data made up of received j-bit dot data (j≧1) of a target ink chamber and k-bit dot data (k≧1) of neighboring ink chambers;
- an input unit which inputs a plurality of energization signals;
- and
- a selection unit for selecting one energization signal from the plurality of energization signals;
- wherein the selection unit is arranged to determine an energization signal to be selected based on a decoding result of the decoding and to drive the target ink chamber with a waveform obtained by the energization signal selected thereby;
- wherein when printing of one line completes, and said multiple shift registers newly receive serial dot data for printing of the next one line, dummy data is added to the serial not data so as not to leave previous dot data in said shift registers;
- wherein said reception unit includes multiple n-bit shift registers for receiving a maximum of n-bit serial dot data, and said reception path change unit includes a transfer unit for, when the number of bits of dot data to be received is given by m (1≧m≧n) bits, shifting m-bit serial dot data, then shifting the serial dot data to an output stage within an own shift register, and transferring the serial dot data to a next shift register.
Dependencies are inferred from the claim text.