Correction data setting apparatus and inkjet head

Patent metadata

Field	Value
Publication number	US-9908325-B2
Application number	US-201615384491-A
Country	US
Kind code	B2
Filing date	Dec 20, 2016
Priority date	Jan 15, 2016
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A first output section outputs a first parameter calculated for each nozzle in a group obtained by dividing the nozzles into groups for each certain number so that density unevenness of ink ejected from each nozzle in the group is corrected. A second output section outputs a second parameter calculated for each group so that change rate of the density unevenness between groups is corrected. A first register circuit divides first parameters for each nozzle in the group and stores the first parameters. A second register circuit divides second parameters for each group and stores the second parameters. A multiplication section sequentially multiplies the first parameters by the second parameters. A conversion section converts a multiplication value to correction data of each nozzle. A setting section sets the correction data in a memory.

First claim

What is claimed is:

1. A correction data setting apparatus which sets correction data in a memory storing correction data of each nozzle for correcting a pulse width of a drive pulse signal applied to each actuator corresponding to each nozzle of an inkjet head comprising a plurality of the nozzles for ejecting ink, comprising:
a first output section configured to output a first parameter calculated for each nozzle in a group obtained by dividing the nozzles into groups for each certain number for correcting density unevenness of the ink ejected from each nozzle in the group;
a second output section configured to output a second parameter calculated for each group for correcting change rate of the density unevenness between groups;
a first register circuit configured to divide the first parameters output from the first output section for each nozzle in the group and store the first parameters;
a second register circuit configured to divide the second parameters output from the second output section for each group and store the second parameters;
a multiplication section configured to sequentially multiply the first parameters of each nozzle stored in the first register circuit by the second parameters of each group stored in the second register circuit;
a conversion section configured to convert a multiplication value calculated by the multiplication section in units of a group to the correction data of each nozzle; and
a setting section configured to set the correction data obtained by the conversion section in the memory.

2. The correction data setting apparatus according to claim 1 , further comprising
a third output section configured to calculate a third parameter for each group to correct an increase or a decrease of ink density occurring between groups;
a third register circuit configured to divide the third parameters output from the third output section for each group and store the third parameters; and
an addition section configured to sequentially add the third parameter of each group stored in the third register circuit to a multiplication value calculated in units of groups by the multiplication section, wherein
the conversion section converts an added value calculated in units of groups by the addition section to the correction data.

3. The correction data setting apparatus according to claim 1 , wherein the actuators comprise piezoelectric members.

4. The correction data setting apparatus according to claim 1 , wherein the conversion section comprises a conversion table.

5. A computer comprising the correction data setting apparatus according to claim 1 , the computer coupled to a printer.

6. An inkjet head, comprising:
an ejection section comprising a plurality of nozzles for ejecting ink;
a plurality of actuators respectively corresponding to the plurality of the nozzles; and
a plurality of drive signal generation sections configured to generate drive pulse signals applied to a plurality of the actuators, wherein
a plurality of the drive signal generation sections adjusts the drive pulse signals depending on a multiplication value of a first parameter which is calculated for compensating a density unevenness of the ink ejected from each nozzle in a group and a second parameter which is calculated for compensating differences in a change rate of the density unevenness between the groups for each group.

7. The inkjet head according to claim 6 , further comprising:
a correction data setting section, which comprises a first parameter setting section configured to set the first parameter and a second parameter setting section configured to set the second parameter, configured to calculate an adjusted value of the drive pulse signal and supply the adjusted value to a correction data input section of the drive signal generation section, wherein
each of a plurality of the drive signal generation sections comprises a correction data input section for receiving the adjusted value of the drive pulse signal, respectively.

8. The inkjet head according to claim 6 , the plurality of the drive signal generation sections further adjusts the drive pulse signals depending on a third parameter for each group to correct an increase or a decrease of ink density occurring between groups.

9. The inkjet head according to claim 6 , wherein the actuators comprise piezoelectric members.

10. A printer comprising the inkjet head according to claim 6 .

11. An inkjet head, comprising:
an ejection section comprising a plurality of nozzles for ejecting ink;
a plurality of actuators respectively corresponding to the plurality of the nozzles; and
a plurality of drive signal generation sections configured to generate drive pulse signals applied to a plurality of the actuators, wherein
a plurality of the drive signal generation sections adjusts the drive pulse signals depending on an added value of a third parameter calculated for compensating an increase or a decrease in an ink density occurring between groups of nozzles and a multiplication value calculated according to a first parameter which is calculated for compensating a density unevenness of the ink ejected from each nozzle in a group and a second parameter which is calculated for compensating a difference in a change rate of the density unevenness between the groups for each group.

12. The inkjet head according to claim 11 , the plurality of the drive signal generation sections further adjusts the drive pulse signals depending on a third parameter for each group to correct an increase or a decrease of ink density occurring between groups.

13. The inkjet head according to claim 11 , wherein the actuators comprise piezoelectric members.

14. A printer comprising the inkjet head according to claim 11 .

15. A correction data setting method which sets correction data in a memory storing correction data of each nozzle for correcting a pulse width of a drive pulse signal applied to each actuator corresponding to each nozzle of an inkjet head, comprising:
outputting a first parameter calculated for each nozzle in a group obtained by dividing the nozzles into groups for each certain number for correcting density unevenness of the ink ejected from each nozzle in the group;
outputting a second parameter calculated for each group for correcting change rate of the density unevenness between groups;
dividing the first parameters output for each nozzle in the group and storing the first parameters;
dividing the second parameters for each group and storing the second parameters;
sequentially multiplying the first parameters of each nozzle stored by the second parameters of each group stored;
converting a multiplication value calculated in units of a group to the correction data of each nozzle; and
setting the correction data obtained.

16. The correction data setting apparatus according to claim 15 , further comprising
calculating a third parameter for each group to correct an increase or a decrease of ink density occurring between groups;
dividing the third parameters output for each group and storing the third parameters;
sequentially adding the third parameter of each group stored to a multiplication value calculated in units of groups; and
converting an added value calculated in units of groups to the correction data.

Assignees

• Toshiba Tec Kk

Inventors

• Nitta Noboru
• Hiyoshi Teruyuki
• Ono Shunichi

Classifications

• B41J2/04581

  controlling heads based on piezoelectric elements · CPC title

• B41J2/04541

  Specific driving circuit · CPC title

• B41J2/04508 Primary

  aiming at correcting other parameters · CPC title

• B41J2/04535

  involving calculation of drop size, weight or volume · CPC title

• B41J2/04591

  Width of the driving signal being adjusted · CPC title