Liquid ejection device
A liquid ejection device includes: a nozzle through which a liquid is ejected; a liquid transport pipe that transports the liquid to the nozzle; and a vibrator that is configured to generate a vibration. The vibrator is in contact with at least one of the liquid, the nozzle, and the liquid transport pipe, and a vibration frequency generated by the vibrator is higher than a self-droplet formation frequency, the self-droplet formation frequency is defined as the number of droplets of the liquid passing through a predetermined position per unit time in a state in which the vibrator does not generate the vibration.
1 . A liquid ejection device comprising:
a nozzle through which a liquid is ejected in a continuous state;
a liquid transport pipe that transports the liquid to the nozzle; and
a vibrator that is configured to generate a vibration, wherein
the vibrator includes a fluid chamber, a diaphragm and a piezoelectric element,
the nozzle is positioned downstream of the fluid chamber,
the diaphragm is disposed, in an ejection direction of fluid ejected from the nozzle, across the fluid chamber from the nozzle,
the piezoelectric element is fixed to a surface of the diaphragm, the surface being opposite from the fluid chamber,
the liquid transport pipe is connected to the fluid chamber,
a vibration frequency generated by the vibrator is higher than a self-droplet formation frequency, the self-droplet formation frequency is defined as a number of droplets of the liquid passing through a predetermined position per unit time in a state in which the vibrator does not generate the vibration, and
the liquid in the continuous state ejected from the nozzle is divided by surface tension of the liquid and flies as the droplets.
2 . The liquid ejection device according to claim 1 , wherein the vibration frequency generated by the vibrator is 1.5 times or less the self-droplet formation frequency.
3 . The liquid ejection device according to claim 1 , wherein the vibration frequency generated by the vibrator is 90 kHz or more.
4 . The liquid ejection device according to claim 2 , wherein the vibration frequency generated by the vibrator is 90 kHz or more.
5 . The liquid ejection device according to claim 1 , wherein the generated vibration causes the liquid to pulsate in a transport direction of the liquid.
6 . The liquid ejection device according to claim 2 , wherein the generated vibration causes the liquid to pulsate in a transport direction of the liquid.
7 . The liquid ejection device according to claim 3 , wherein the generated vibration causes the liquid to pulsate in a transport direction of the liquid.
8 . The liquid ejection device according to claim 4 , wherein the generated vibration causes the liquid to pulsate in a transport direction of the liquid.
9 . The liquid ejection device according to claim 5 , wherein the vibrator causes the liquid transport pipe to vibrate in the transport direction of the liquid.
10 . The liquid ejection device according to claim 8 , wherein the vibrator causes the liquid transport pipe to vibrate in the transport direction of the liquid.
11 . The liquid ejection device according to claim 5 , wherein the vibrator causes the liquid transport pipe to vibrate in a direction orthogonal to the transport direction of the liquid.
12 . The liquid ejection device according to claim 8 , wherein the vibrator causes the liquid transport pipe to vibrate in a direction orthogonal to the transport direction of the liquid.