Printhead and printing apparatus

Patent metadata

Field	Value
Publication number	US-10427400-B2
Application number	US-201715837470-A
Country	US
Kind code	B2
Filing date	Dec 11, 2017
Priority date	Jan 6, 2017
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A printhead comprises a printing element, a driving circuit configured to drive the printing element, an analog signal processing circuit configured to process one or more analog signals, a bias circuit configured to supply a bias voltage to the analog signal processing circuit, and a control terminal to which a control signal is inputted. In a state in which the analog signal processing circuit and the bias circuit are receiving a supply of power, it is possible to switch starting and stopping of at least one of the analog signal processing circuit and the bias circuit based on the control signal.

First claim

What is claimed is:

1. A printhead comprising:
a printing element;
a driving circuit configured to drive the printing element;
an analog signal processing circuit configured to process one or more analog signals;
a bias circuit configured to supply a bias voltage to the analog signal processing circuit; and
a control terminal to which a control signal is inputted,
wherein, in a state in which the analog signal processing circuit and the bias circuit are receiving a supply of power, it is possible to switch starting and stopping of at least one of the analog signal processing circuit and the bias circuit based on the control signal.

2. The printhead according to claim 1 , wherein the bias circuit has a switch for switching starting and stopping of the bias circuit based on the control signal.

3. The printhead according to claim 1 , wherein the analog signal processing circuit has a switch for switching starting and stopping of the analog signal processing circuit based on the control signal.

4. The printhead according to claim 1 ,
wherein the printhead has a plurality of analog signal processing circuits, and
the bias circuit supplies the bias voltage to the plurality of analog signal processing circuits.

5. The printhead according to claim 1 , wherein the analog signal comprises at least one of a signal corresponding to a resistance value of the printing element, a signal corresponding to a temperature, a signal corresponding to an ON resistance value of a driver included in the driving circuit, and a differential signal.

6. The printhead according to claim 1 , wherein the printhead further comprises a digital circuit configured to process a digital signal supplied to the driving circuit.

7. The printhead according to claim 1 , wherein the analog signal processing circuit comprises at least one of a reception circuit configured to receive an LVDS signal, and a detection circuit configured to detect a discharge state of liquid in accordance with driving of the printing element.

8. The printhead according to claim 1 ,
further comprising at least one print element substrate, wherein
the at least one print element substrate comprises:
the printing element,
the driving circuit,
the analog signal processing circuit,
the bias circuit, and
the control terminal.

9. The printhead according to claim 1 ,
further comprising at least one print element substrate, wherein
the at least one print element substrate comprises:
an analog circuit that includes the analog signal processing circuit and the bias circuit,
a digital circuit configured to process a digital signal supplied to the driving circuit,
a first power supply terminal to which a first voltage is inputted,
a second power supply terminal to which a voltage equal to the first voltage is inputted,
a first power supply wiring line that connects the first power supply terminal and the analog circuit, and
a second power supply wiring line, provided separately from the first power supply wiring line, that connects the second power supply terminal and the digital circuit.

10. A printing apparatus comprising:
a printhead; and
a control unit configured to control the printhead,
wherein the printhead comprises:
a printing element;
a driving circuit configured to drive the printing element;
an analog signal processing circuit configured to process an analog signal; and
a bias circuit configured to supply a bias voltage to the analog signal processing circuit,

wherein it is possible to switch starting and stopping of at least one of the analog signal processing circuit and the bias circuit based on a control signal, and
the control unit outputs the control signal to the printhead.

11. The printing apparatus according to claim 10 ,
wherein the printhead comprises:
a plurality of print element substrates including at least first and second print element substrates; and
a wiring substrate electrically connected to the plurality of print element substrates, and

wherein the plurality of print element substrates each comprises:
the printing element;
the driving circuit;
the analog signal processing circuit; and
the bias circuit, and
wherein the wiring substrate comprises:
a control terminal to which the control signal outputted from the control unit is inputted.

12. The printing apparatus according to claim 10 ,
wherein the printhead comprises a plurality of print element substrates, and
the control unit, with respect to a print element substrate that is not used for printing out of the plurality of print element substrates, outputs to the printhead a control signal indicating stoppage of supply of the bias voltage.

13. The printing apparatus according to claim 10 ,
wherein the printhead comprises a plurality of element substrates including at least first, second, and third print element substrates, wherein each of the plurality of element substrates is allocated to at least first and second groups,
wherein the plurality of print element substrates each comprises:
the printing element,
the driving circuit,
the analog signal processing circuit, and
the bias circuit, and

wherein the control unit outputs to the printhead a first control signal corresponding to the first group and a second control signal corresponding to the second group.

14. The printing apparatus according to claim 10 ,
wherein the printhead comprises:
a plurality of print element substrates including at least first, second, and third print element substrates;
a wiring substrate electrically connected to the plurality of print element substrates,

wherein the plurality of print element substrates are each allocated to at least first and second groups, and
wherein the wiring substrate comprises:
a first control terminal to which a first control signal corresponding to the first group is inputted, and
a second control terminal to which a second control signal corresponding to the second group is inputted.

Assignees

• Canon Kk

Inventors

• Yamato Hidenori
• Kanno Hideo
• Sakurai Masataka
• Kasai Ryo
• Umeda Kengo

Classifications

• B41J2/04563

  detecting head temperature; Ink temperature · CPC title

• B41J2/04548 Primary

  Details of power line section of control circuit · CPC title

• B41J2/0458

  controlling heads based on heating elements forming bubbles · CPC title

• B41J2/04541

  Specific driving circuit · CPC title

• B41J2/04518

  reducing costs · CPC title