# US 10,500,847 B2 · Liquid ejecting head and liquid ejecting device

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- Number: US 10,500,847 B2
- Document ID: US10500847B2
- Status: Granted
- Kind: B2
- Application number: 15/933,780
- Filed: 2018-03-23
- Published: 2018-09-27
- Granted: 2019-12-10
- Earliest claimed: 2017-03-24
- Assignees: Toshiba Tec Kabushiki Kaisha
- Applicants: Toshiba Tec Kabushiki Kaisha
- Inventors: Noboru Nitta; Ryutaro Kusunoki
- Web page: https://patentgrep.com/patent/US10500847B2

## CPC

- B41J 2/04563: {detecting head temperature; Ink temperature}
- B41J 2/04581: {controlling heads based on piezoelectric elements}
- B41J 2/14: Structure thereof {only for on-demand ink jet heads}
- B41J 2/14201: {Structure of print heads with piezoelectric elements}
- B41J 2/17: characterised by ink handling {(cleaning by driving a fluid through the nozzles to the outside thereof B41J2/1652; for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing B41J11/0015)}
- B41J 2/17546: {electronically}
- B41J 2/18: Ink recirculation systems
- B41J 29/393: Devices for controlling or analysing the entire machine {; Controlling or analysing mechanical parameters involving printing of test patterns}
- B41J 2002/14491: {Electrical connection}
- B41J 2202/12: with ink circulating through the whole print head
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A liquid ejecting head includes an actuator communicating with a nozzle, configured to eject liquid from the nozzle, a drive circuit on a circuit board configured to drive the actuator, a flow path of liquid circulating, a first temperature sensor configured to measure a temperature on a surface on the circuit board proximate to the drive circuit, and a second temperature sensor configured to measure a temperature of a liquid on the flow path of liquid circulating.

## Claims

### Claim 1

A liquid ejecting device, comprising:
an actuator communicating with a nozzle and configured to eject liquid from the nozzle;
a drive circuit configured to drive the actuator;
a flow path of liquid circulating;
a wiring connector on a circuit board having a plurality of terminals;
a first temperature sensor configured to measure a temperature on a surface on the circuit board proximate to the drive circuit and connected to a first terminal of the plurality of terminals;
a second temperature sensor configured to measure a temperature of a liquid on the flow path of liquid circulating and connected to a second terminal of the plurality of terminals; and
a control board configured to:
stop a printing operation if a first temperature value determined based on a signal supplied via the first terminal is outside of a first predetermined allowable range,
not apply a drive voltage to the drive circuit if a second temperature value determined based on a signal supplied via the second terminal is outside of a second predetermined allowable range and the first temperature value is within the first predetermined allowable range, and
apply a drive voltage to the drive circuit if the second temperature value is within the second predetermined allowable range and the first temperature value is within the first predetermined allowable range.

### Claim 2 (depends on 1)

The liquid ejecting device according to claim 1, wherein the control board is further configured to perform a notification processing when the first temperature value is outside of the first predetermined allowable range or the second temperature value is outside of the second predetermined allowable range.

### Claim 3 (depends on 1)

The liquid ejecting device according to claim 1, wherein the flow path passes through the actuator and is connectable to an external liquid storage tank.

### Claim 4 (depends on 3)

The liquid ejecting device according to claim 3, wherein the liquid is heated or cooled in the flow path proximate to the external liquid storage tank.

### Claim 5 (depends on 3)

The liquid ejecting device according to claim 3, wherein
the second temperature sensor is on a collection pipe on the downstream side of the actuator, and
the collection pipe comprises a thermal conductive pipe and a tube covering an outer surface of the pipe.

### Claim 6 (depends on 3)

The liquid ejecting device according to claim 3, wherein the first temperature sensor is closer to the drive circuit than the second temperature sensor is to the drive circuit.

### Claim 7 (depends on 3)

The liquid ejecting device according to claim 3, wherein the first and second temperature sensors are thermistors.