Drive device
AssigneeRISO Technologies Corporation
InventorMasaya Ichikawa
Life of this patent
Estimating the term…
Abstract
A drive device includes a drive circuit to output a drive signal that is to be applied to an actuator of a liquid ejection head for ejecting liquid droplets. The drive signal includes an adjustment ejection waveform portion that includes a first portion having an expansion pulse that decreases pressure in a pressure chamber of the actuator and a second portion having a contraction pulse that increases pressure in the pressure chamber. The contraction pulse includes voltage increase changes that change the voltage applied to the actuator stepwise and a return pulse that is between a pair of voltage increase changes. The return pulse changes from a first voltage level that is less than a maximum voltage level of the contraction pulse to a second voltage level that is greater than a minimum voltage level of the expansion pulse.
Claims20
A drive device, comprising:
- a drive circuit configured to output a drive signal waveform to be applied to an actuator of a liquid ejection head, wherein
- the drive signal waveform includes an adjustment ejection waveform portion that causes liquid to be ejected once by a cycle of expansion and contraction and includes:
- a first portion having an expansion pulse that decreases pressure in a pressure chamber of the actuator, and
- a second portion having a contraction pulse that increases pressure in the pressure chamber, the contraction pulse including a plurality of voltage increase changes that change the voltage applied to the actuator stepwise and a return pulse that is between a pair of voltage increase changes in the plurality of voltage increase changes, the return pulse changing from a first voltage level that is less than a maximum voltage level of the contraction pulse to a second voltage level that is greater than a minimum voltage level of the expansion pulse.
A liquid ejection head, comprising:
- an actuator that expands and contracts a pressure chamber to eject a liquid from a nozzle associated with the pressure chamber;
- and
- a drive circuit configured to output a drive signal waveform to be applied to the actuator, wherein
- the drive signal waveform includes an adjustment ejection waveform portion that causes liquid to be ejected once by a cycle of expansion and contraction and includes:
- a first portion having an expansion pulse that decreases pressure in a pressure chamber of the actuator, and
- a second portion having a contraction pulse that increases pressure in the pressure chamber, the contraction pulse including a plurality of voltage increase changes that change the voltage applied to the actuator stepwise and a return pulse that is between a pair of voltage increase changes in the plurality of voltage increase changes, the return pulse changing from a first voltage level that is less than a maximum voltage level of the contraction pulse to a second voltage level that is greater than a minimum voltage level of the expansion pulse.
A printer, comprising:
- an inkjet head;
- and
- a sheet conveying mechanism configured to position a sheet relative to the inkjet head, wherein
- the inkjet head includes:
- an actuator that expands and contracts a pressure chamber to eject a liquid from a nozzle associated with the pressure chamber;
- and
- a drive circuit configured to output a drive signal waveform to be applied to the actuator, wherein
- the drive signal waveform includes an adjustment ejection waveform portion that causes liquid to be ejected once by a cycle of expansion and contraction and includes:
- a first portion having an expansion pulse that decreases pressure in a pressure chamber of the actuator, and
- a second portion having a contraction pulse that increases pressure in the pressure chamber, the contraction pulse including a plurality of voltage increase changes that change the voltage applied to the actuator stepwise and a return pulse that is between a pair of voltage increase changes in the plurality of voltage increase changes, the return pulse changing from a first voltage level that is less than a maximum voltage level of the contraction pulse to a second voltage level that is greater than a minimum voltage level of the expansion pulse.
Dependencies are inferred from the claim text.