Droplet discharge apparatus

Patent metadata

Field	Value
Publication number	US-11926153-B2
Application number	US-202117503862-A
Country	US
Kind code	B2
Filing date	Oct 18, 2021
Priority date	Oct 26, 2020
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

A droplet discharge apparatus includes a discharge device, a plurality of waveform generation units, a plurality of correction units, and a drive unit. The discharge device discharges droplets of a plurality of droplet types according to a plurality of drive waveforms. The plurality of waveform generation units individually generate drive waveforms used to discharge each of the plurality of droplet types. The plurality of correction units individually correct the drive waveforms generated by each of the plurality of waveform generation units, using correction magnifications different corresponding to the drive waveforms generated by the plurality of waveform generation units, to generate correction waveforms. The drive unit causes the discharge device to discharge the droplets according to corrected drive waveforms generated by individually switching the drive waveform corresponding to the plurality of droplet types to the correction waveforms.

First claim

The invention claimed is:

1. A droplet discharge apparatus comprising:
a discharge device configured to discharge droplets of a plurality of droplet types according to a plurality of drive waveforms;
a plurality of waveform generation units configured to individually generate drive waveforms used to discharge each of the plurality of droplet types;
a plurality of correction units configured to individually correct the drive waveforms generated by each of the plurality of waveform generation units, using correction magnifications different corresponding to the drive waveforms generated by the plurality of waveform generation units, to generate correction waveforms;
a drive unit configured to cause the discharge device to discharge the droplets according to corrected drive waveforms generated by individually switching the drive waveform corresponding to the plurality of droplet types to the correction waveforms; and
a speed measurement unit configured to measure a speed of a droplet for each of the plurality of droplet types,
wherein the plurality of correction units are configured determine a correction magnification for each of the plurality of droplet types and correct the speed based on a measurement result of the speed by the speed measurement unit.

2. The droplet discharge apparatus according to claim 1 , further comprising a position specifying unit configured to specify, for each of the plurality of droplet types, a landing position at which a droplet lands on a recording medium,
wherein the plurality of correction units are configured to determine a correction magnification to decrease a difference between the landing position and a target point for each of the plurality of droplet types, based on the difference between the landing position and the target point.

3. The droplet discharge apparatus according to claim 1 , wherein the drive unit further includes:
a switching circuit configured to switch the correction waveforms to obtain a corrected drive waveform; and
a piezoelectric element configured to displace according to a voltage of the corrected drive waveform, and
wherein the voltage is adjustable according to a correction magnification.

4. The droplet discharge apparatus according to claim 1 ,
wherein the plurality of waveform generation units includes a plurality of different circuits configured to generate the drive waveforms.

5. The droplet discharge apparatus according to claim 1 ,
wherein the discharge device is an inkjet discharge device configured to discharge ink droplets to form an image on a recording medium.

6. A droplet discharge apparatus comprising:
a discharge device configured to discharge droplets of a plurality of droplet types;
a first waveform generation unit configured to generate a first waveform to discharge a first droplet type of the plurality of droplet types;
a second waveform generation unit configured to generate a second waveform to discharge a second droplet type of the plurality of droplet types;
a first correction unit configured to correct the first waveform at a first correction magnification to generate a first correction waveform;
a second correction unit configured to correct the second waveform at a second correction magnification to generate a second correction waveform;
a drive unit configured to cause the discharge device to discharge the droplets according to corrected drive waveforms obtained as a result of switching the first correction waveform and the second correction waveform; and
a speed measurement unit configured to measure a speed of a droplet for each of the plurality of droplet types,
wherein the first correction unit is configured to determine the first correction magnification for the first droplet type and correct the speed of the first droplet type based on a measurement result of the speed by the speed measurement unit;
wherein the second correction unit is configured to determine the second correction magnification for the second droplet type and correct the speed of the second droplet type based on the measurement result of the speed by the speed measurement unit.

7. A droplet discharge apparatus comprising:
a discharge device configured to discharge droplets of a plurality of droplet types;
a first circuit configured to:
generate a first waveform to discharge a first droplet type of the plurality of droplet types; and
correct the first waveform at a first correction magnification to generate a first correction waveform;

a second circuit configured to:
generate a second waveform to discharge a second droplet type of the plurality of droplet types; and
correct the second waveform at a second correction magnification to generate a second correction waveform;

a third circuit configured to cause the discharge device to discharge the droplets according to corrected drive waveforms obtained as a result of switching the first correction waveform and the second correction waveform; and
a speed measurement unit configured to measure a speed of a droplet for each of the plurality of droplet types,
wherein the first circuit is configured to determine the first correction magnification for the first droplet type and correct the speed of the first droplet type based on a measurement result of the speed by the speed measurement unit;
wherein the second circuit is configured to determine the second correction magnification for the second droplet type and correct the speed of the second droplet type based on the measurement result of the speed by the speed measurement unit.

Assignees

• Maeda Takatsugu
• Ricoh Co Ltd

Inventors

• Maeda Takatsugu

Classifications

• B41J2/04508 Primary

  aiming at correcting other parameters · CPC title

• B41J2/04586

  controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type · CPC title

• B41J2/04588 Primary

  using a specific waveform · CPC title

• B41J2/04581

  controlling heads based on piezoelectric elements · CPC title

• B41J2/0459

  Height of the driving signal being adjusted · CPC title