Inkjet printing device and method
AssigneeFujitsu Limited
InventorHiroshi Nou
Life of this patent
Estimating the term…
Abstract
In an inkjet printing device, at least two kinds of drive waveforms are selectively fed to each of plezoelectric elements for controlling an injection amount of ink to be jetted toward a print medium via a corresponding nozzle. One of the drive waveforms is in the form of a cardiac waveform which has two voltage changing points in one drive period thereof. At the voltage changing point, a sign of slope of voltage variation is inverted. In the cardiac waveform, a voltage at one of the voltage changing points is set lower than a standby voltage, while a voltage at the other voltage changing point is set higher than the standby voltage.
Claims57
An inkjet printing device comprising:
- a drive waveform feed device for feeding drive waveforms;
- deform devices each of which deforms according to applied one of said drive waveforms;
- analog switches connected to said deform devices, respectively, for choosing the corresponding deform devices to be fed with the drive waveforms according to print data, each of said analog switches including switching elements each for selecting one of said drive waveforms fed from the drive waveform feed device;
- pressure chambers each of which is supplied with ink and injects the ink via a corresponding nozzle by displacing a meniscus of the ink filled therein due to deformation of the corresponding deform device which is caused in response to the selected one of said drive waveforms;
- and
- an initializing device provided for each of said analog switches to forcibly turn on one of said switching elements of the corresponding analog switch per given period, so that all the deform devices are restored to a standby state per said given period.
An inkjet printing device comprising:
- a drive waveform feed device for feeding drive waveforms;
- deform devices each of which deforms according to the applied one of said drive waveforms;
- analog switches connected to said deform devices, respectively, for choosing the corresponding deform devices to be fed with the drive waveforms according to print data, each of said analog switches including switching elements each for selecting one of said drive waveforms fed from the drive waveform feed device;
- pressure chambers each of which is supplied with ink and injects the ink via a corresponding nozzle by varying a pressure applied to the ink filled therein due to deformation of the corresponding deform device which is caused in response to the selected one of said drive waveforms;
- and
- an initializing device provided for each of said analog switches to forcibly turn on one of said switching elements of the corresponding analog switch per given period, so that all the deform devices are restored to a standby state per said given period.
An inkjet printing device comprising:
- a drive waveform feed device for feeding drive waveforms;
- deform devices each of which deforms according to applied one of said drive waveforms;
- analog switches connected to said deform devices, respectively, for choosing the corresponding deform devices to be fed with the drive waveforms according to print data, each of said analog switches including switching elements each for selecting one of said drive waveforms fed from the drive waveform feed device;
- pressure chambers each of which is supplied with ink and injects the ink via a corresponding nozzle by varying an internal volume thereof due to deformation of the corresponding deform device which is caused in response to the selected one of said drive waveforms;
- and
- an initializing device provided for each of said analog switches to forcibly turn on one of said switching elements of the corresponding analog switch per given period, so that all the deform devices are restored to a standby state per said given period.
An inkjet printing method wherein deform devices to be fed with drive waveforms are selected using analog switches, each having switching elements each for selecting one of said drive waveforms, according to print data and ink is injected via corresponding nozzles by deforming said deform devices in response to the selected one of the fed drive waveforms to displace meniscuses of the ink in the nozzles, said method comprising the step of forcibly turning on one of the switching elements of the corresponding analog switches per given period so that all the deform devices are restored to a standby state per given period.
An inkjet printing method wherein deform devices to be fed with drive waveforms are selected using analog switches, each having switching elements each for selecting one of said drive waveformns, according to print data and ink is injected via corresponding nozzles by deforming said deform devices in response to the selected one of the fed drive waveforms to vary pressures applied to the ink filled in corresponding pressure chambers, said method comprising the step of forcibly turning on one of the switching elements of the corresponding analog switches per given period so that all the deform devices are restored to a standby state per given period.
An inkjet printing method wherein deform devices to be fed with drive waveforms are selected using analog switches, each having switching elements each for selecting one of said drive waveforms, according to print data and ink is injected via corresponding nozzles by deforming said deform devices in response to the selected one of the fed drive waveforms to vary internal volumes of corresponding pressure chambers filled with the ink, said method comprising the step of forcibly turning on one of the switching elements of the corresponding analog switches per given period so that all the deform devices are restored to a standby state per given period.
An inkjet printing device comprising:
- a drive waveform feed device for feeding at least two kinds of drive waveforms;
- deform devices each of which deforms according to applied one of said drive waveforms;
- a switching device for choosing the deform devices to be fed with the drive waveforms according to print data;
- and
- pressure chambers each of which is supplied with ink and injects the ink via a corresponding nozzle by displacing a meniscus of the ink filled therein due to deformation of the corresponding deform device,
- wherein a drive period of at least one of said drive waveforms is divided into a plurality of sub-periods each having a sub-waveform capable of injecting the ink, and wherein said switching device is capable of choosing one or a plurality of said sub-waveforms, in an order of the sub-waveforms which provide lower injection speeds of the ink.
An inkjet device comprising:
- a drive waveform feed device for feeding drive waveforms;
- deform devices each of which deforms according to applied one of said drive waveforms;
- a switching device for choosing the deform devices to fed with the drive waveforms;
- a switching device for choosing the deform devices to be fed with the drive waveforms according to print data;
- and
- pressure chambers each of which is supplied with ink and injects the ink via a corresponding nozzle by varying a pressure applied to the ink filled therein due to deformation of the corresponding deform device,
- wherein at least two kinds of pressure variations having different amplitudes are provided and a drive period of at least one of said pressure variations is divided into a plurality of sub-periods each having a sub-variation with an amplitude capable of injecting the ink, and wherein said switching device is capable of setting one or a plurality of said sub-variations, in an order of said sub-variations which provide lower injection speeds of the ink.
An inkjet printing device comprising:
- a drive waveform feed device for feeding drive waveforms;
- deform devices each of which deforms according to applied one of said drive waveforms;
- a switching device for choosing the deform devices to be fed with the drive waveforms according to print data;
- and
- pressure chambers each of which is supplied with ink and injects the ink via a corresponding nozzle by varying an internal volume thereof due to deformation of the corresponding deform device,
- wherein at least two kinds of internal volume variations having different amplitudes are provided and a drive period of at least one of said internal volume variations is divided into a plurality of sub-periods each having a sub-variation with an amplitude capable of injecting the ink, and wherein said switching device is capable of setting one or a plurality of said sub-variations, in an order of the sub-variations which provide lower injection speeds of the ink.
An inkjet printing method wherein deform devices to be fed with drive waveforms of at least two kinds are selected according to print data and ink is injected via corresponding nozzles by deforming said deform devices based on the fed drive waveforms to displace meniscuses of the ink in the nozzles, said method comprising the steps of:
- dividing a drive period of at least one of said drive waveforms into a plurality of sub-periods each having a sub-waveform capable of injecting the ink;
- setting one or a plurality of said sub-waveforms for the corresponding deform devices, in an order of said sub-waveforms which provide lower injection speeds of the ink.
An inkjet printing method wherein deform devices to be fed with drive waveforms are selected according to print data and ink is injected via corresponding nozzles by deforming said deform devices based on the fed drive waveforms to vary pressures applied to the ink filled in corresponding pressure chambers, said method comprising the steps of:
- providing at least two kinds of pressure variations having different amplitudes;
- dividing a drive period of at least one of said pressure variations into a plurality of sub-periods each having a sub-variation with an amplitude capable of injecting the ink;
- and
- setting one or a plurality of said sub-variations for the corresponding pressure chambers, in an order of said sub-variations which provide lower injection speeds of the ink.
An inkjet printing method deform devices to be fed with drive waveforms are selected according to print data and ink is injected via corresponding nozzles by deforming said deform devices based on the fed drive waveforms to vary internal volumes of corresponding pressure chambers filled with the ink, said method comprising the steps of:
- providing at least two kinds of internal volume variations having different amplitudes;
- dividing a drive period of at least one of said internal volume variations into a plurality of sub-periods each having a sub-variation with an amplitude capable of injecting the ink;
- and
- setting one or a plurality of said sub-variation for the corresponding pressure chambers, in an order of the sub-variations which provide lower injection speeds of the ink.
Dependencies are inferred from the claim text.