Liquid dispensing head

Abstract

To suppress generation of unevenness in the viscosity of liquid in a flow channel member in a constitution in which an actuator member includes a trunk part.SOLUTION: A head 3 includes a flow channel member 21 having a plurality of individual flow channels formed therein, and an actuator member 22 having a plurality of actuator parts. The actuator member 22 includes a plurality of individual electrodes, a plurality of branch parts connecting the plurality of individual electrodes, and a trunk part connecting the plurality of branch parts and provided with a contact point with a COF. The head 3 further includes a communication channel 60 which is in communication with the plurality of individual flow channels and through which an ink flows. The communication channel 60 has an overlapping portion 61 overlapping with the trunk part in a Z direction.SELECTED DRAWING: Figure 10

Claims

1. A flow path member having a plurality of individual flow paths, each including a nozzle and a pressure chamber communicating with the nozzle, and a plurality of common flow paths communicating with each of the plurality of individual flow paths, The actuator member comprises an actuator member disposed on the surface of the flow channel member and having a plurality of actuator portions that overlap each of the pressure chambers of the plurality of individual flow channels in a first direction perpendicular to the surface, The actuator member includes a plurality of individual electrodes constituting the plurality of actuator parts, a plurality of branch parts connecting the plurality of individual electrodes, and a main body connecting the plurality of branch parts and having a contact point with the power supply part. The system further comprises a communication channel that communicates with the aforementioned plurality of individual channels, The aforementioned communication channel has an overlapping portion that overlaps with the main body in the first direction, The liquid discharge head is characterized in that the overlapping portion connects the plurality of common flow paths to each other, or connects the plurality of branch flow paths that connect the ends of the plurality of common flow paths to each other.

2. The aforementioned trunk has multiple branching points from which each of the multiple branching points branches, The liquid dispensing head according to claim 1, characterized in that the overlapping portion extends across the plurality of branching portions.

3. The flow channel member has a plate in which the pressure chamber is formed, The liquid dispensing head according to claim 1, characterized in that at least a portion of the overlapping portion is formed on the plate.

4. The liquid dispensing head according to claim 1, characterized in that the width of the trunk is greater than the width of the branch.

5. The actuator member is A piezoelectric body comprising a plurality of piezoelectric layers stacked in the first direction, The electrode body includes a first electrode layer, a second electrode layer separated from the first electrode layer in the first direction, and a third electrode layer separated from the first electrode layer in the first direction. The first electrode layer comprises a plurality of first electrodes to which a first potential and a second potential different from the first potential are selectively applied, and includes a plurality of first electrodes that overlap each of the pressure chambers of the plurality of individual flow channels in the first direction. The second electrode layer includes a second electrode that is maintained at the first potential. The third electrode layer includes a third electrode that is maintained at the second potential. The piezoelectric material has a first active portion sandwiched between the first electrode and the second electrode in the first direction, and two second active portions sandwiched between the first electrode and the third electrode in the first direction, wherein the two second active portions are separated from each other in an orthogonal direction perpendicular to the first direction, sandwiching the first active portion. The liquid dispensing head according to claim 1, characterized in that at least one of the second electrode and the third electrode has the plurality of individual electrodes, the plurality of branches, and the main trunk.

6. The device comprises a plurality of individual electrode rows, each composed of a plurality of individual electrodes arranged in a second direction perpendicular to the first direction, The plurality of individual electrode rows are arranged in a third direction that is perpendicular to the first direction and intersects the second direction. The plurality of branches each extend in the second direction and are aligned in the third direction, The aforementioned section has an extended portion that extends in the third direction, The liquid dispensing head according to claim 1, characterized in that the overlapping portion extends in the third direction and overlaps with the extending portion in the first direction.

7. The system comprises a plurality of individual channel rows, each composed of a plurality of individual channels arranged in the second direction, The plurality of individual flow path rows are arranged in the third direction, The plurality of common channels each extend in the second direction, are aligned in the third direction, and communicate with the plurality of individual channels that constitute each of the plurality of individual channel rows. The liquid discharge head according to claim 6, characterized in that the overlapping portion extends in the third direction and connects the plurality of common flow paths to one another.

8. Each of the aforementioned multiple common flow paths has one end communicating with a liquid supply port and the other end communicating with a liquid return port. The liquid dispensing head according to claim 7, characterized in that the overlapping portion connects one end and the other end to each other.

9. The system comprises a plurality of individual channel rows, each composed of a plurality of individual channels arranged in the second direction, The plurality of individual flow path rows are arranged in the third direction, The plurality of common channels each extend in the second direction, are aligned in the third direction, and communicate with the plurality of individual channels that constitute each of the plurality of individual channel rows. The plurality of branch channels connect the ends of the plurality of common channels in the second direction, each extending in the second direction and aligned in the third direction. The liquid discharge head according to claim 6, characterized in that the overlapping portion extends in the third direction and connects the plurality of branch passages to each other.

10. The plurality of branch channels include a first branch channel communicating with a liquid supply port and a second branch channel communicating with a liquid return port. The liquid discharge head according to claim 9, characterized in that the overlapping portion connects the first branch channel and the second branch channel to each other.

11. The aforementioned section includes a first section located at one end of the plurality of common channels in the second direction, and a second section located at the other end of the plurality of common channels in the second direction. The liquid discharge head according to any one of claims 7 to 10, characterized in that the overlapping portion includes a first overlapping portion that overlaps the first trunk in the first direction, and a second overlapping portion that overlaps the second trunk in the first direction.

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