LIQUID EJECTION HEAD AND LIQUID EJECTION DEVICE
A liquid ejection head includes pressure chambers, each connected to a nozzle. A first-side common chamber is on one side of the pressure chambers and a second-side common chamber is on another side of the pressure chambers. Coupling flow channels connect the pressure chambers to the first-side common chamber and the second-side common liquid chamber. A cross-sectional area of each pressure chamber taken perpendicular to a first direction between the first- and second-side common chambers is less than or equal to 0.01 mm 2 . A cross-sectional area of each coupling flow channel taken perpendicular to the first direction is less than one quarter of the cross-sectional area of each pressure chamber.
1 . A liquid ejection head, comprising:
a plurality of pressure chambers, each pressure chamber connected to a nozzle;
a first-side common liquid chamber on a first side of the plurality of pressure chambers;
a second-side common liquid chamber on a second side of the plurality of pressure chambers, the plurality of pressure chambers being between the first-side common liquid chamber and the second-side common liquid chamber in a first direction;
a plurality of first coupling flow channels, each first coupling flow channel being respectively connected to a first side of one of the pressure chambers and the first-side common liquid chamber; and
a plurality of second coupling flow channels, each second coupling flow channel being respectively connected to a second side of one of the pressure chambers and the second-side common liquid chamber, wherein
a cross-sectional area of each pressure chamber in the plurality of pressure chambers taken perpendicular to the first direction is less than or equal to 0.01 mm 2 , and
a cross-sectional area of each of the first and second coupling flow channels taken perpendicular to the first direction is less than one quarter of the cross-sectional area of each pressure chamber in the plurality of pressure chambers.
2 . The liquid ejection head according to claim 1 , wherein the first coupling flow channels have the same length along the first direction as the second coupling flow channels.
3 . The liquid ejection head according to claim 1 , wherein the cross-sectional area of each first coupling flow channel is the same as the cross-sectional area of each second coupling flow channel.
4 . The liquid ejection head according to claim 1 , wherein each first coupling flow channel has the same cross-sectional area for its full length in the first direction.
5 . The liquid ejection head according to claim 4 , wherein each second coupling flow channel has the same cross-sectional area for its full length in the first direction.
6 . The liquid ejection head according to claim 1 , wherein the cross-sectional area of each of the first and second coupling flow channel is the minimum cross-sectional area along the full length of the respective first and second coupling flow channel in the first direction.
7 . The liquid ejection head according to claim 1 , further comprising:
a nozzle plate including a plurality of nozzles at positions corresponding to the plurality of pressure chambers;
a vibration member including a plurality of vibrating regions at positions corresponding to the plurality of pressure chambers, the plurality of pressure chambers being between the nozzle plate and the vibration member; and
an actuator unit including a plurality of piezoelectric elements at positions corresponding to the plurality of vibrating regions, the vibration member being between the actuator unit and the plurality of pressure chambers.
8 . A liquid ejection device, comprising:
an ink jet head; and
a controller configured to cause the ink jet head to eject liquid, wherein
the ink jet head includes:
a plurality of pressure chambers, each pressure chamber connected to a nozzle,
a first-side common liquid chamber on a first side of the plurality of pressure chambers,
a second-side common liquid chamber on a second side of the plurality of pressure chambers, the plurality of pressure chambers being between the first-side common liquid chamber and the second-side common liquid chamber in a first direction,
a plurality of first coupling flow channels, each first coupling flow channel being respectively connected to a first side of one of the pressure chambers and the first-side common liquid chamber, and
a plurality of second coupling flow channels, each second coupling flow channel being respectively connected to a second side of one of the pressure chambers and the second-side common liquid chamber;
a cross-sectional area of each pressure chamber in the plurality of pressure chambers taken perpendicular to the first direction is less than or equal to 0.01 mm 2 ; and
a cross-sectional area of each of the first and second coupling flow channels taken perpendicular to the first direction is less than one quarter of the cross-sectional area of each pressure chamber in the plurality of pressure chambers.
9 . The liquid ejection device according to claim 8 , wherein each first coupling flow channel has the same cross-sectional area for its full length in the first direction.
10 . The liquid ejection device according to claim 9 , wherein each second coupling flow channel has the same cross-sectional area for its full length in the first direction.
11 . The liquid ejection device according to claim 8 , wherein the cross-sectional area of each of the first and second coupling flow channel is the minimum cross-sectional area along the full length of the respective first and second coupling flow channel in the first direction.
12 . The liquid ejection device according to claim 8 , wherein the ink jet head further includes:
a nozzle plate including a plurality of nozzles at positions corresponding to the plurality of pressure chambers;
a vibration member including a plurality of vibrating regions at positions corresponding to the plurality of pressure chambers, the plurality of pressure chambers being between the nozzle plate and the vibration member; and
an actuator unit including a plurality of piezoelectric elements at positions corresponding to the plurality of vibrating regions, the vibration member being between the actuator unit and the plurality of pressure chambers.
13 . A liquid ejection head, comprising:
a plurality of pressure chambers;
a nozzle plate including a plurality of nozzles at positions corresponding to the plurality of pressure chambers, each pressure chamber being respectively connected to a nozzle in the plurality of nozzles;
a vibration member including a plurality of vibrating regions at positions corresponding to the plurality of pressure chambers, the plurality of pressure chambers being between the nozzle plate and the vibration member;
an actuator unit including a plurality of piezoelectric elements at positions corresponding to the plurality of vibrating regions, the vibration member being between the actuator unit and the plurality of pressure chambers;
a first-side common liquid chamber on a first side of the plurality of pressure chambers;
a second-side common liquid chamber on a second side of the plurality of pressure chambers, the plurality of pressure chambers being between the first-side common liquid chamber and the second-side common liquid chamber in a first direction;
a plurality of first coupling flow channels, each first coupling flow channel being respectively connected to a first side of one of the pressure chambers and the first-side common liquid chamber; and
a plurality of second coupling flow channels, each second coupling flow channel being respectively connected to a second side of one of the pressure chambers and the second-side common liquid chamber, wherein
a cross-sectional area of each pressure chamber in the plurality of pressure chambers taken perpendicular to the first direction is less than or equal to 0.01 mm 2 , and
a cross-sectional area of each of the first and second coupling flow channels taken perpendicular to the first direction is less than one quarter of the cross-sectional area of each pressure chamber in the plurality of pressure chambers.
14 . The liquid ejection head according to claim 13 , wherein the first coupling flow channels have the same length along the first direction as the second coupling flow channels.
15 . The liquid ejection head according to claim 13 , wherein the cross-sectional area of each first coupling flow channel is the same as the cross-sectional area of each second coupling flow channel.
16 . The liquid ejection head according to claim 13 , wherein each first coupling flow channel has the same cross-sectional area for its full length in the first direction.
17 . The liquid ejection head according to claim 16 , wherein each second coupling flow channel has the same cross-sectional area for its full length in the first direction.
18 . The liquid ejection head according to claim 13 , wherein the cross-sectional area of each of the first and second coupling flow channel is the minimum cross-sectional area along the full length of the respective first and second coupling flow channel in the first direction.
19 . A liquid ejection device, comprising:
a controller; and
a liquid ejection head according to claim 18 , wherein
the controller is configured to cause the liquid ejection head to eject liquid.
20 . A liquid ejection device, comprising:
a controller; and
a liquid ejection head according to claim 13 , wherein
the controller is configured to cause the liquid ejection head to eject liquid.