Liquid discharge head and liquid discharge recording apparatus

1. A liquid discharge head, comprising:

a substrate comprising a plurality of pressure chambers;

a nozzle plate on a first surface of the substrate and comprising a plurality of nozzles, each of the plurality of nozzles aligned with a corresponding one of the plurality of pressure chambers; and

a damper member on a second surface of the substrate and comprising a pressure wave absorbing material, portions of the damper member being on the second surface at positions between adjacent pressure chambers, wherein

the pressure wave absorbing material of the damper member has a Young's modulus less than that of a material forming the substrate.

2. The liquid discharge head according to claim 1 , wherein the damper member comprises a plurality of damper chambers respectively facing the plurality of pressure chambers.

3. The liquid discharge head according to claim 1 , wherein the pressure wave absorbing material is an elastically deformable material.

4. The liquid discharge head according to claim 1 , wherein

the damper member includes a damper chamber facing one of the pressure chambers, and

the damper chamber is a cylindrical opening in the damper member having an inner diameter that is greater than a diameter of the one of the pressure chambers.

5. The liquid discharge head according to claim 1 , wherein

the damper member includes a damper chamber facing one of the pressure chambers, and

the damper chamber is a cylindrical opening in the damper member having an inner diameter that is less than a diameter of the one of the pressure chambers.

6. The liquid discharge head according to claim 1 , wherein

the damper member includes a damper chamber facing one of the pressure chambers, and

the damper chamber comprises a plurality of through holes in the damper member, each through hole having an inner diameter that is less than a diameter of the one of the pressure chambers.

7. The liquid discharge head according to claim 1 , further comprising:

a second damper member spaced from the damper member in a common pressure chamber, the second damper member comprising a pressure wave absorbing material.

8. The liquid discharge head according to claim 1 , wherein the portions of the damper member are damper walls spaced from each other in a direction parallel to the second surface.

9. The liquid discharge head according to claim 1 , wherein

the damper member includes a damper chamber facing one of the pressure chambers, and

the damper chamber is a cylindrical opening in the damper member having an inner diameter that is substantially equal to a diameter of the one of the pressure chambers.

10. The liquid discharge head according to claim 1 , wherein the pressure wave absorbing material has a reflectance R of 0.5≤R≤2 when a specific acoustic impedance of the damping member is represented by Z1, a specific acoustic impedance of the liquid supplied in the pressure chamber is represented by Z2, and the reflectance R is calculated as (Z2−Z1)/(Z1+Z2).

11. A liquid discharge head, comprising:

a liquid supply unit; and

a liquid discharge unit including:

a substrate with a plurality of pressure chambers therein,

a nozzle plate on a first surface of the substrate and including a plurality of nozzles, and

a damper member on a second surface of the substrate at positions between the plurality of pressure chamber and formed of an elastically deformable material, wherein

the liquid supply unit covers the second surface of the substrate and the damper member and forms a common liquid chamber that is fluidly connected to the plurality of nozzles, and

the elastically deformable material of the damper member has a Young's modulus less than that of a material forming the substrate.

12. The liquid discharge head according to claim 11 , wherein the damper member is configured to absorb pressure waves generated in the plurality of pressure chambers by the ejection of liquid from the plurality of nozzles.

13. The liquid discharge head according to claim 11 , wherein the elastically deformable material has a reflectance R of 0.5≤R≤2 when a specific acoustic impedance of the damping member is represented by Z1, a specific acoustic impedance of the liquid supplied in the pressure chamber is represented by Z2, and the reflectance R is calculated as (Z2−Z1)/(Z1+Z2).

14. The liquid discharge head according to claim 11 , wherein the nozzle plate further comprises a plurality of driving elements configured to drive the ejection of liquid from the plurality of nozzles.

15. The liquid discharge head according to claim 11 , wherein nozzles of the plurality of nozzles are each coaxial with a corresponding one of the plurality of the pressure chambers.

16. A liquid discharge recording apparatus, comprising:

a liquid discharge head that includes:

a substrate having a plurality of pressure chambers,

a nozzle plate on a first surface of the substrate and including a plurality of nozzles facing the plurality of pressure chambers, and

a damper member on a second surface of the substrate, the damper member being elastically deformable material; and

a media support device configured to position an object relative to the liquid discharge head for liquid droplet discharge.

17. The liquid discharge recording apparatus according to claim 16 , wherein the damper member is elastically deformable with a pressure variation caused by liquid droplet discharge.

18. The liquid discharge recording apparatus according to claim 16 , wherein the elastically deformable material of the damper member has a Young's modulus less than that of a material forming the substrate.

19. The liquid discharge recording apparatus according to claim 16 , wherein the elastically deformable material of the damper member has a reflectance R of 0.5≤R≤2 when a specific acoustic impedance of the damping member is represented by Z1, a specific acoustic impedance of the liquid supplied in the pressure chamber is represented by Z2, and the reflectance R is calculated as (Z2−Z1)/(Z1+Z2).

20. The liquid discharge recording apparatus according to claim 16 , wherein nozzles of the plurality of nozzles are each coaxial with a corresponding one of the plurality of the pressure chambers.