Piezo actuator module for broadband-frequency haptic feedback

1 . A piezo actuator module capable of haptic feedback in a wide frequency range comprising:

an actuator layer including a piezo actuator having one surface coupled to an object to be excited and vibrating by an electric signal;

an inertial mass layer having a certain mass and coupled to the other surface of the actuator layer,

wherein the inertial mass layer supports the other surface of the actuator layer when the piezo actuator vibrates, and

an intermediate layer provided between the object to be excited and the actuator layer or between the actuator layer and the inertial mass layer, and having a certain stiffness or a certain elastic force.

2 . The piezo actuator module capable of haptic feedback in the wide frequency range according to claim 1 ,

wherein in the piezo actuator module, mass of the inertial mass layer is selected to optimize excitation performance in a low frequency region.

3 . The piezo actuator module capable of haptic feedback in the wide frequency range according to claim 1 ,

wherein the intermediate layer includes an adhesive component to improve adhesion between the object to be excited and the actuator layer or between the actuator layer and the inertial mass layer.

4 . The piezo actuator module capable of haptic feedback in the wide frequency range according to claim 1 ,

wherein the piezo actuator module further includes:

a housing having an enclosure shape with a hollow inside to accommodate the actuator layer, the inertial mass layer and the intermediate layer, that is open on one side and closed on the other side.

5 . The piezo actuator module capable of haptic feedback in the wide frequency range according to claim 4 ,

wherein, when the intermediate layer is provided between the actuator layer and the inertial mass layer,

the piezo actuator module further includes:

an adhesive layer that seals the open side of the housing, has a certain elastic force, and includes an adhesive component.

6 . The piezo actuator module capable of haptic feedback in the wide frequency range according to claim 1 ,

wherein the intermediate layer comprises a material selected to control a resonance frequency in a low frequency region.

7 . A piezo actuator module capable of haptic feedback in a wide frequency range comprising:

an actuator layer including a piezo actuator having one surface coupled to an object to be excited and vibrating by an electric signal;

an inertial mass housing having an enclosure shape with a hollow inside to accommodate the actuator layer, that is open on one side and closed on the other side,

wherein the inertial mass housing includes a sealing surface having a certain mass and in contact with the other surface of the actuator layer, and a side surface extending to one side along a circumference of the sealing surface, and

the inertial mass housing supports the other surface of the actuator layer when the piezo actuator vibrates; and

an intermediate layer provided between the object to be excited and the actuator layer or between the actuator layer and the inertial mass housing, and having a certain stiffness or a certain elastic force.

8 . The piezo actuator module capable of haptic feedback in the wide frequency range according to claim 7 ,

wherein in the piezo actuator module, mass of the sealing surface is selected to optimize excitation performance in a low frequency region.

9 . The piezo actuator module capable of haptic feedback in the wide frequency range according to claim 7 ,

wherein the intermediate layer comprises a material selected to control a resonance frequency in a low frequency region.

10 . The piezo actuator module capable of haptic feedback in the wide frequency range according to claim 7 ,

wherein, when the intermediate layer is provided between the actuator layer and the inertial mass housing,

the piezo actuator module further includes:

an adhesive layer that seals the open side of the housing, has a certain elastic force, and includes an adhesive component.