INKJET HEAD AND INKJET DEVICE USING SAME

• US 20190077144A1
• Filed: 08/30/2018
• Published: 03/14/2019
• Est. Priority Date: 09/11/2017
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: NAKATANI, SHUHEI, OHTSUKA, FUTOSHI, TOYOFUKU, YOUSUKE
• Granted Patent: US 10,457,042 B2
• Time in Patent Office: Days
• CPC Class Codes: B41J 2/04541 Specific driving circuit
• CPC Class Codes: B41J 2/04581 controlling heads based on piezoelectric elements
• CPC Class Codes: B41J 2/14274 of stacked structure type, deformed by compression/extension and disposed on a diaphragm
• CPC Class Codes: B41J 2/145 Arrangement thereof
• CPC Class Codes: B41J 2202/12 with ink circulating through the whole print head

Abstract

An object of the disclosure is to provide an inkjet head that makes it possible to realize alleviation of ink-discharge malfunction due to fluid crosstalk possibly caused among multiple discharge components, and that also simultaneously makes it possible to maintain a desirable volume of discharged liquid droplets. Furthermore, another object of the disclosure is to provide an inkjet device including the inkjet head.

Claims

1. An inkjet head, comprising:

(i) multiple discharge units, each including

a nozzle that discharge a liquid droplet,

a first pressure chamber that is connected to the nozzle,

a supply-side second pressure chamber and a discharge-side pressure chamber that are connected to the first pressure chamber,

a supply-side third pressure chamber that is connected to the supply-side second pressure chamber,

a discharge-side third pressure chamber that is connected to the discharge-side second pressure chamber,

an energy-generating element that imparts a discharge force to a liquid inside the first pressure chamber,

a supply-side first throttle part that is provided between the first pressure chamber and the supply-side second pressure chamber,

a discharge-side first throttle part that is provided between the first pressure chamber and the discharge-side second pressure chamber,

a supply-side second throttle part that is provided between the supply-side second pressure chamber and the supply-side third pressure chamber, and

a discharge-side second throttle part that is provided between the discharge-side second pressure chamber and the discharge-side third pressure chamber;

(ii) a supply-side common flow channel that connects the supply-side third pressure chambers in the respective multiple discharge units; and

(iii) a discharge-side common flow channel that connects the discharge-side third pressure chambers in the respective multiple discharge units.

2. The inkjet head according to claim 1, wherein the first pressure chamber, the supply-side second pressure chamber, the discharge-side second pressure chamber, the supply-side third pressure chamber, and the discharge-side third pressure chamber are linearly arranged.

3. The inkjet head according to claim 1, wherein a line joining the supply-side first throttle part and the supply-side second throttle part is not parallel to an ink-flow direction.

4. The inkjet head according to claim 1, further comprising a supply-side damper provided in the supply-side second pressure chamber.

5. The inkjet head according to claim 4, wherein the supply-side damper is provided so as to extend over the supply-side third pressure chamber and the supply-side second pressure chamber.

6. The inkjet head according to claim 4, wherein a part of the supply-side damper is located in midair.

7. The inkjet head according to claim 4, wherein the supply-side first throttle part is farther away from the supply-side damper than the supply-side second throttle part.

8. The inkjet head according to claim 1, wherein the supply-side second throttle part has a channel resistance greater than the supply-side first throttle part.

13. An inkjet device, comprising:

the inkjet head according to claim 1;

a drive control unit that produces a drive voltage signal applied to the energy-generating element and that controls a discharge action of the inkjet head; and

a conveying unit that causes a relative movement of the inkjet head and a subject to be lithographed.

9. An inkjet head, comprising:

(i) multiple discharge units, each including

a nozzle that discharges a liquid droplet,

a first pressure chamber that is connected to the nozzle,

a supply-side second pressure chamber and a discharge-side pressure chamber that are connected to the first pressure chamber,

a supply-side third pressure chamber that is connected to the supply-side second pressure chamber,

an energy-generating element that imparts a discharge force to a liquid inside the first pressure chamber,

a supply-side first throttle part that is provided between the first pressure chamber and the supply-side second pressure chamber,

a discharge-side first throttle part that is provided between the first pressure chamber and the discharge-side second pressure chamber, and

a supply-side second throttle part that is provided between the supply-side second pressure chamber and the supply-side third pressure chamber;

(ii) a supply-side common flow channel that connects the supply-side third pressure chambers in the respective multiple discharge units; and

(iii) a discharge-side common flow channel that connects the discharge-side second pressure chambers in the respective multiple discharge units.

10. The inkjet head according to claim 9, wherein the first pressure chamber, the supply-side second pressure chamber, the discharge-side second pressure chamber, and the supply-side third pressure chamber are linearly arranged.

11. The inkjet head according to claim 9, wherein a line joining the supply-side first throttle part and the supply-side second throttle part is not parallel to an ink-flow direction.

12. The inkjet head according to claim 9, further comprising a supply-side damper that is provided in the supply-side second pressure chamber, and a discharge-side damper that is provided in the discharge-side second pressure chamber, wherein the supply-side damper has rigidness higher than the discharge-side damper.