Recording apparatus and control method

Patent metadata

Field	Value
Publication number	US-12358278-B2
Application number	US-202218049576-A
Country	US
Kind code	B2
Filing date	Oct 25, 2022
Priority date	Oct 29, 2021
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

A recording apparatus includes recording elements to eject ink, heating elements to heat the ink, and a common wiring through which the recording elements and the heating elements are applied with a voltage. The recording apparatus determines a drive pulse applied to the recording elements based on the number of recording elements to be simultaneously driven and the number of heating elements to be simultaneously driven.

First claim

What is claimed is:

1. A recording apparatus comprising:
a recording head including a recording element substrate on which a plurality of recording elements and a plurality of heating elements are provided, the plurality of recording elements being configured to eject ink, the plurality of heating elements being configured to heat the ink without ejecting the ink, and a common wiring for an application of a drive voltage from a drive power supply being connected to the recording element substrate;
an obtaining unit configured to obtain both a first number of recording elements to be driven in a predetermined period of time among the plurality of recording elements and a second number of heating elements to be driven in the predetermined period of time among the plurality of heating elements; and
a control unit configured to determine, based on the first number and the second number, a drive pulse for applying a voltage to the plurality of recording elements, and to respectively control driving of the plurality of recording elements and driving of the plurality of heating elements, based on the determination.

2. The recording apparatus according to claim 1 , wherein
the control unit determines the drive pulse by adding a modulation amount based on the first number and the second number to a basic pulse.

3. The recording apparatus according to claim 2 , wherein
the control unit obtains the basic pulse based on at least one of a heater rank for each individual piece of the print head and a head temperature detected by a temperature sensor.

4. The recording apparatus according to claim 1 , wherein
the control unit obtains a first modulation amount based on the first number, obtains a second modulation amount based on the second number, and determines the drive pulse by adding the first modulation amount and the second modulation amount to a basic pulse.

5. The recording apparatus according to claim 4 , wherein
the first modulation amount is set to be longer in a case where the first number is a predetermined number as compared with a case where the first number is lower than the predetermined number.

6. The recording apparatus according to claim 4 , wherein
the second modulation amount is set to be longer in a case where the second number is a predetermined number as compared with a case where the second number is lower than the predetermined number.

7. The recording apparatus according to claim 4 , wherein
the second modulation amount is obtained based on the second number and an environment temperature.

8. The recording apparatus according to claim 1 , wherein
the obtaining unit obtains the first number and the second number each time the predetermined period of time has elapsed, and
the control unit determines the drive pulse each time the predetermined period of time has elapsed.

9. The recording apparatus according to claim 1 , wherein
the obtaining unit obtains the first number and the second number at a timing at which recording data is latched.

10. The recording apparatus according to claim 1 , wherein
the control unit sets a maximum drive number of the second number based on at least one of an environment temperature and a recording mode.

11. The recording apparatus according to claim 1 , wherein each of the plurality of recording elements is provided at a position opposed to corresponding one of a plurality of ejection openings.

12. The recording apparatus according to claim 1 , wherein each of the plurality of recording elements is an electro-thermal conversion element.

13. The recording apparatus according to claim 1 , wherein the plurality of heating elements adjusts temperature so as to maintain a viscosity of the ink inside the recording head.

14. A control method comprising:
obtaining, in a recording head including a recording element substrate on which a plurality of recording elements and a plurality of heating elements are provided, the plurality of recording elements being configured to eject ink, the plurality of heating elements being configured to heat the ink without ejecting the ink, a common wiring for an application of a drive voltage from a drive power supply being connected to the recording element substrate, both a first number of recording elements to be driven in a predetermined period of time among the plurality of recording elements and a second number of heating elements to be driven in the predetermined period of time among the plurality of heating elements; and
determining, based on the first number and the second number, a drive pulse for applying a voltage to the plurality of recording elements.

Assignees

• Canon Kk

Inventors

• Mogi Sae
• Suzuki Kazuo
• Kato Masataka
• Nitta Masaki
• Murase Takeshi
• Taira Hiroshi
• Kawafuji Hiroshi

Classifications

• B41J2/0458

  controlling heads based on heating elements forming bubbles · CPC title

• B41J2/04573

  Timing; Delays · CPC title

• B41J2/04528

  aiming at warming up the head · CPC title

• B41J2/04591

  Width of the driving signal being adjusted · CPC title

• B41J2/04563

  detecting head temperature; Ink temperature · CPC title