Liquid ejecting head chip, liquid ejecting head, and liquid ejecting apparatus

Patent metadata

Field	Value
Publication number	US-10427404-B2
Application number	US-201815883837-A
Country	US
Kind code	B2
Filing date	Jan 30, 2018
Priority date	Feb 3, 2017
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

According to an embodiment, a liquid ejecting head chip includes an actuator plate, a cover plate, a common electrode, and a connection wiring. In the actuator plate, a plurality of discharge channels and a plurality of non-discharge channels which extend in a Z-direction are alternately arranged at a distance in an X-direction. The cover plate is stacked on an AP-side-Y-direction inner side surface, so as to close the plurality of discharge channels and the plurality of non-discharge channels. The common electrode is formed on an inner surface of each of the discharge channels. The connection wiring is divided so as to be formed in at least 3 or more places in the X-direction on the cover plate, and the common electrode connects the connection wiring to the flexible substrate.

First claim

What is claimed is:

1. A liquid ejecting head chip comprising:
an actuator plate in which a plurality of ejection channels and a plurality of non-ejection channels which extend in a first direction are alternately arranged at a distance in a second direction which is orthogonal to the first direction;
a cover plate which is stacked on an actuator plate-side first main surface of the actuator plate in a third direction which is orthogonal to the first direction and the second direction, so as to close the plurality of ejection channels and the plurality of non-ejection channels;
a common electrode which is formed on an inner surface of each of the ejection channels;
an individual electrode which is formed on an inner surface of each of the non-ejection channel; and
a connection wiring which is divided so as to be formed in at least 3 or more places in the second direction on the cover plate, and connects the common electrode to an external wiring,
wherein the connection wiring is formed at a tail portion of the cover plate, which extends out of one end surface of the actuator plate in the first direction, in a stacked state of the actuator plate and the cover plate.

2. The liquid ejecting head chip according to claim 1 ,
wherein a liquid supply passage which penetrates the cover plate in the third direction and communicates with the ejection channel is formed in the cover plate, and
the connection wiring includes:
an in-liquid-supply-passage electrode which is formed on an inner surface of the liquid supply passage; and
a lead wiring which is divided so as to be formed in at least 3 or more places in the second direction on the tail portion of the cover plate, and which connects the in-liquid-supply-passage electrode to the external wiring.

3. The liquid ejecting head chip according to claim 2 ,
wherein, at one end of the cover plate in the first direction in the tail portion, a plurality of recess portions which are recessed toward the other end of the cover plate in the first direction and are disposed to be spaced from each other in the second direction are formed, and
the lead wiring connects the in-liquid-supply-passage electrode to the external wiring through the recess portion.

4. The liquid ejecting head chip according to claim 2 ,
wherein a plurality of through-holes which penetrate the cover plate in the third direction and are disposed to be spaced from each other in the second direction are formed at one end portion of the cover plate in the first direction in the tail portion, and
the lead wiring connects the in-liquid-supply-passage electrode to the external wiring through the through-hole.

5. The liquid ejecting head chip according to claim 2 ,
wherein the liquid supply passage includes a plurality of slits which are opened in a cover plate-side first main surface of the cover plate, which faces the actuator plate-side first main surface, so as to communicate with the ejection channels and which are disposed to be spaced from each other in the second direction,
a plurality of actuator plate-side common pads which extend from the common electrodes and are disposed to be spaced from each other in the second direction are formed at a portion of the actuator plate-side first main surface, which is positioned on one side of the ejection channel in the first direction, and
a plurality of cover plate-side common pads which extend from the in-liquid-supply-passage electrode, are disposed to be spaced from each other in the second direction, and respectively face the actuator plate-side common pads in the third direction are formed around the slits in the cover plate-side first main surface.

6. The liquid ejecting head chip according to claim 5 ,
wherein a transverse common electrode which is connected to the plurality of cover plate-side common pads and extends in the second direction is formed on the cover plate-side first main surface.

7. The liquid ejecting head chip according to claim 6 ,
wherein an electrode clearance groove which extends in the second direction and faces the transverse common electrode in the third direction is formed at a portion of the actuator plate-side first main surface, which is positioned on one side of the ejection channel in the first direction.

8. The liquid ejecting head chip according to claim 2 ,
wherein the lead wiring includes a common terminal which is divided so as to be formed in at least 3 or more places in the second direction on a cover plate-side first main surface facing the actuator plate-side first main surface at the tail portion of the cover plate, and which is connected to the external wiring.

9. The liquid ejecting head chip according to claim 1 ,
wherein, on the actuator plate-side first main surface, an actuator plate-side individual wiring which extends in the second direction at one end portion thereof in the first direction, and connects individual electrodes which face each other with the ejection channel interposed between the individual electrodes is formed,
in the cover plate, a cover plate-side individual wiring which is divided in the second direction at the one end portion thereof in the first direction is formed on the cover plate-side first main surface which faces the actuator plate-side first main surface, and
the cover plate-side individual wiring includes:
a cover plate-side individual pad which faces the actuator plate-side individual wiring in the third direction; and
an individual terminal which extends from the cover plate-side individual pad toward one end in the first direction.

10. A liquid ejecting head comprising:
the liquid ejecting head chip according to claim 1 .

11. The liquid ejecting head according to claim 10 , further comprising a pair of liquid ejecting head chips which are disposed such that a cover plate-side second main surface on a side of one cover plate, which is opposite to the cover plate-side first main surface which faces the actuator plate-side first main surface faces a cover plate-side second main surface on the side of the other cover plate, in the third direction,
wherein a liquid supply passage which penetrates the cover plate in the third direction and communicates with the ejection channel is formed in the cover plate,
a flow passage plate is disposed between the pair of liquid ejecting head chips, and
an inlet flow passage which communicates with liquid supply passages of the pair of the cover plates is formed in the flow passage plate.

12. The liquid ejecting head according to claim 11 ,
wherein each of the plurality of ejection channels is opened in the other end surface of the actuator plate in each of the pair of liquid ejecting head chips in the first direction,
an ejection plate which has ejection holes which respectively communicate with the ejection channels is disposed on the other end side of each of the pair of actuator plates in the first direction,
a return plate which has circulation passages which cause the ejection channels to respectively communicate with the ejection holes is disposed between the pair of actuator plates and the ejection plate in the first direction, and
an outlet flow passage which communicates with the circulation passages is formed in the flow passage plate.

13. A liquid ejecting apparatus comprising:
the liquid ejecting head according to claim 10 ; and
a moving mechanism that relatively moves the liquid ejecting head and a recording medium.

Assignees

• Sii Printek Inc

Inventors

• Kubota Yuzuru
• Nishikawa Daichi

Classifications

• B41J2/1623

  bonding and adhesion · CPC title

• B41J2/155

  for line printing · CPC title

• B41J2/14209 Primary

  of finger type, chamber walls consisting integrally of piezoelectric material · CPC title

• B41J2202/18

  Electrical connection established using vias · CPC title

• B41J2/1634

  laser machining · CPC title