Controller for inkjet apparatus

An ink-jet apparatus that sequentially forms dots on a print medium by moving relative to the print medium, the ink-jet apparatus comprising:

• a cavity plate having a cavity from which an ink droplet is ejected;
• an actuator that changes a pressure in the cavity;
• and
• a controller that outputs drive pulses, at predetermined print cycles, to the actuator based on dot data,
• wherein when dot data for a current print cycle indicates ink ejection while dot data for a next print cycle indicates no ink ejection, the controller continuously outputs a plurality of drive pulses, over the current and next print cycles, after a certain delay from a start of the current print cycle, to the actuator to cause ejection of a plurality of ink droplets from the cavity to form a dot.

An ink-jet apparatus, comprising:

• a cavity plate having a cavity from which an ink droplet is ejected;
• an actuator that changes a pressure in the cavity;
• and
• a controller comprising:
• a waveform generator that generates a plurality of waveform signals to be issued at predetermined print cycles to the actuator such that the ink-jet apparatus forms dots sequentially according to the plurality of waveform signals on a print medium while the ink-jet apparatus moves relative to the print medium, the plurality of waveform signals including a waveform signal extending over two adjacent print cycles and a waveform signal completing within a print cycle;
• and
• a waveform selector that receives the plurality of waveform signals from the waveform generator and selects one of the plurality of waveform signals from the received plurality of waveform signals based on whether dot data for two adjacent print cycles indicates ink ejection, and outputs a selected waveform signal to the actuator, the waveform selector selecting the waveform signal extending over two adjacent print cycles when the dot data for a current print cycle indicates ink ejection while the dot data for a next print cycle indicates no ink ejection and the waveform selector selecting the waveform signal completing within a print cycle for the current print cycle when the dot data for both current and next print cycles indicates ink ejection.

An ink-jet apparatus that sequentially forms dots on a print medium by moving relative to the print medium, the ink-jet apparatus comprising:

• a cavity plate having a cavity from which an ink droplet is ejected;
• an actuator that changes a pressure in the cavity;
• and
• a controller that outputs drive pulses, at predetermined print cycles, to the actuator based on dot data,
• wherein when dot data for a current print cycle indicates ink ejection while dot data for a next print cycle indicates no ink ejection, the controller continuously outputs a plurality of drive pulses, after a certain delay from a start of the current print cycle, to the actuator to cause ejection of a plurality of ink droplets from the cavity to form a dot, and when the dot data for both current and next print cycles indicate ink ejection, the controller continuously outputs a plurality of drive pulses without a delay from the start of the current print cycle.