Characteristic table generation system, method of generating characteristic table, and program of generating characteristic table

Patent metadata

Field	Value
Publication number	US-11919291-B2
Application number	US-202117549238-A
Country	US
Kind code	B2
Filing date	Dec 13, 2021
Priority date	Dec 16, 2020
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

There are provided a characteristic table generation system and so on capable of enhancing the convenience of the user. The characteristic table generation system according to an embodiment of the present disclosure is a system for generating a predictive voltage characteristic table for defining a predictive characteristic curve, the system including a data acquisition section configured to obtain a measured viscosity characteristic table defining a measured characteristic curve between viscosity and temperature of the liquid, and a predetermined parameter separately, as input data, a conversion coefficient generation section configured to generate a conversion coefficient used when performing a conversion process from the measured characteristic curve into the predictive characteristic curve based on the predetermined parameter using a first analytical method as a predetermined analytical method which takes the predetermined parameter as an explanatory variable, and which takes the conversion coefficient as an objective variable, and a table generation section configured to perform the conversion process using the measured viscosity characteristic table and the conversion coefficient generated by the conversion coefficient generation section to thereby generate the predictive voltage characteristic table.

First claim

What is claimed is:

1. A characteristic table generation system configured to generate a predictive voltage characteristic table for defining a predictive characteristic curve between temperature and a voltage value representing a crest value of at least one pulse based on a predetermined standard value in a drive signal which includes the pulse and is applied to a jet section configured to jet liquid, the characteristic table generation system comprising:
a data acquisition section configured to obtain a measured viscosity characteristic table defining a measured characteristic curve between viscosity and temperature of the liquid, and a predetermined parameter separately, as input data;
a conversion coefficient generation section configured to generate a conversion coefficient used when performing a conversion process from the measured characteristic curve into the predictive characteristic curve based on the predetermined parameter using a first analytical method as a predetermined analytical method which takes the predetermined parameter as an explanatory variable, and which takes the conversion coefficient as an objective variable; and
a table generation section configured to perform the conversion process using the measured viscosity characteristic table and the conversion coefficient generated by the conversion coefficient generation section to thereby generate the predictive voltage characteristic table.

2. The characteristic table generation system according to claim 1 , wherein the predetermined parameter includes at least one of a specific gravity of the liquid and a physical property value obtained using the specific gravity of the liquid.

3. The characteristic table generation system according to claim 2 , wherein the conversion process includes:
a preliminary process of generating a preliminary characteristic curve representing a relationship between a voltage value and temperature from the measured characteristic curve using the conversion coefficient, and
an add operation of adding a voltage shift amount to the voltage value in the preliminary characteristic curve to thereby generate the predictive characteristic curve, and
wherein the predetermined parameter further includes at least one of parameters of:
a number of drops corresponding to a number of the pulses included in a unit period in the drive signal,
a viscosity value of the liquid at a reference temperature,
the voltage shift amount, and
a voltage sensitivity of the liquid corresponding to a variation per unit voltage in either one of ejection speed of the liquid and a drop volume of the liquid when the liquid is jetted at the reference temperature.

4. The characteristic table generation system according to claim 3 , wherein the voltage sensitivity of the liquid is generated based on a target value of either one of the ejection speed of the liquid and the drop volume of the liquid, using a second analytical method as the predetermined analytical method which takes the target value of either one of the ejection speed of the liquid and the drop volume of the liquid as the explanatory variable, and which takes the voltage sensitivity of the liquid as the objective variable.

5. The characteristic table generation system according to claim 1 , wherein the conversion process includes:
a preliminary process of generating a preliminary characteristic curve representing a relationship between a voltage value and temperature from the measured characteristic curve, using the conversion coefficient, and
an add operation of adding a voltage shift amount to the voltage value in the preliminary characteristic curve to thereby generate the predictive characteristic curve, and
wherein the voltage value added with the voltage shift amount corresponds to either one of a voltage value with which a standard ejection speed of the liquid is obtained as the predetermined standard value, and a voltage value with which a standard drop volume of the liquid is obtained as the predetermined standard value, when the liquid is jetted from the jet section.

6. The characteristic table generation system according to claim 5 , wherein using a third analytical method as the predetermined analytical method which includes at least one of a parameter representing a viscosity value of the liquid at a reference temperature and a parameter representing presence or absence of common drive in the drive signal in the explanatory variable, and which takes the voltage shift amount as the objective variable, the voltage shift amount is generated based on the explanatory variable including at least one of the parameters.

7. The characteristic table generation system according to claim 6 , wherein the explanatory variable in the third analytical method further includes at least one of parameters of:
a head rank value which corresponds to the voltage value with which a predetermined ejection speed is achieved when a predetermined test liquid is jetted from the jet section, and which is a value inherent in a liquid jet head having the jet section,
a type of the liquid jet head,
a specific gravity of the liquid,
a voltage sensitivity of the liquid corresponding to a variation per unit voltage in either one of ejection speed of the liquid and a drop volume of the liquid when the liquid is jetted at the reference temperature, and
a surface tension value of the liquid.

8. The characteristic table generation system according to claim 1 , wherein the predetermined analytical method is a method using a machine learning model to which the predetermined parameter is input, and from which the conversion coefficient is output.

9. The characteristic table generation system according to claim 1 , further comprising a signal generation section which is configured to obtain a crest value of the pulse using the predictive voltage characteristic table generated by the table generation section, and which is configured to generate the drive signal using the pulse having the crest value obtained.

10. The characteristic table generation system according to claim 1 , wherein the data acquisition section, the conversion coefficient generation section, and the table generation section are disposed in an external device located outside a liquid jet recording device incorporating a liquid jet head having the jet section.

11. The characteristic table generation system according to claim 1 , wherein the data acquisition section, the conversion coefficient generation section, and the table generation section are disposed in a liquid jet recording device incorporating a liquid jet head having the jet section.

12. The characteristic table generation system according to claim 11 , wherein the data acquisition section, the conversion coefficient generation section, and the table generation section are disposed in the liquid jet head.

13. A method of generating a characteristic table as a predictive voltage characteristic table for defining a predictive characteristic curve between temperature and a voltage value representing a crest value of at least one pulse based on a predetermined standard value in a drive signal which includes the pulse and is applied to a jet section configured to jet liquid, the method comprising:
obtaining a measured viscosity characteristic table defining a measured characteristic curve between viscosity and temperature of the liquid, and a predetermined parameter separately, as input data;
generating a conversion coefficient used when performing a conversion process from the measured characteristic curve into the predictive characteristic curve based on the predetermined parameter using a first analytical method as a predetermi

Assignees

• Sii Printek Inc

Inventors

• Shimizu Takayuki
• Hirata Masakazu

Classifications

• B41F31/005 Primary

  Ink viscosity control means · CPC title

• B41F33/16

  Programming systems for automatic control of sequence of operations · CPC title

• B41J2/195

  for monitoring ink quality · CPC title

• B41J2/01 Primary

  Ink jet · CPC title

• B41J2/04581 Primary

  controlling heads based on piezoelectric elements · CPC title