Inkjet recording device
AssigneeRicoh Printing Systems, Ltd.
InventorsShinya Kobayashi, Hitoshi Kida, Takahiro Yamada
Life of this patent
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Abstract
An inkjet recording device includes a nozzle module, a switching unit, a waveform generating unit, an image recognizing unit and a pulse width modulating unit. The image recognizing unit determines an ejection condition of the ink droplet ejected from the nozzle while referring to ejection data indicating a type of each pixel to be recorded, and generates switch pulse width data that includes the ejection data and the ejection condition. The pulse width modulating unit generates the switch pulse based on the switch pulse width data. The switching unit opens and closes in response to a switch pulse. An opening duration of the switch unit is variable depending on the switch pulse.
Claims10
An inkjet recording device comprising:
- a nozzle module having a plurality of nozzles for ejecting ink droplets and a plurality of piezoelectric elements each including a common electrode and an individual electrode wherein the piezoelectric element is deformed when a potential difference is generated between the common electrode and the individual electrode, the nozzles being provided in one-to-one correspondence with the piezoelectric elements wherein each nozzle ejects the ink droplet in accordance with deformation of the corresponding piezoelectric element;
- a switching unit including one terminal connected to the individual electrode and another terminal grounded, the switching unit arranged to open and close in response to a switch pulse, with an opening duration of the switch unit being variable depending on the switch pulse;
- a waveform generating unit for applying a drive voltage to the common electrodes of all the nozzles commonly;
- an image recognizing unit for receiving an ejection data indicating a type of each of a plurality of pixels of an image to be recorded, wherein the image recognizing unit is arranged for identifying blocks of said pixels and identifying an internal pixel from each of said blocks, and is arranged for generating a switch pulse width data corresponding to each of said blocks based on the ejection data of the internal pixel and the ejection data of other pixels of the block;
- and
- a pulse width modulating unit for generating the switch pulse based on the switch pulse width data,
- wherein the switch pulse width data indicates an ejection condition of ink droplets ejected from different ones of said nozzles.
Dependencies are inferred from the claim text.