Piezo based inertia actuator for high definition haptic feedback
A haptic device includes an elongated piezo bender supported by a first holder and a second holder. The first holder and the second holder being spaced apart from each other and located at or near opposite ends of the elongated piezo bender. A mass is supported by the elongated piezo bender and positioned in between the first holder and the second holder. The mass has a non-uniform thickness in a direction along a major axis of the elongated piezo bender. An electrical driving signal generator is configured to generate a signal to create a vibration in the elongated piezo bender.
1. A haptic device, comprising:
an elongated piezo bender supported by a first holder and a second holder, the first holder and the second holder being spaced apart from each other and located at or near opposite ends of the elongated piezo bender;
a mass supported by the elongated piezo bender and positioned in between the first holder and the second holder, the mass having a non-uniform thickness in a direction along a major axis of the elongated piezo bender;
a pair of dampers, wherein each damper is located in between one end portion of the mass and the elongated piezo bender; and
an electrical driving signal generator configured to generate a signal to create a vibration in the elongated piezo bender.
2. The haptic device according to claim 1 , wherein the mass is thicker in a center portion and thinner in end portions in the direction along the major axis of the elongated piezo bender.
3. The haptic device according to claim 1 , further comprising a first actuator configured to move the first holder towards and away from the second holder.
4. The haptic device according to claim 3 , further comprising a second actuator configured to move the second holder towards and away from the first holder.
5. A haptic device, comprising:
an elongated piezo bender having a first end and a second end;
a first holder configured to support the elongated piezo bender;
a second holder configured to support the elongated piezo bender, the first holder and the second holder being configured to vary a holding distance in between the first holder and the second holder to adjust a natural frequency of the haptic device;
a mass supported by the elongated piezo bender; and
an electrical driving signal generator configured to generate a signal to create a vibration in the elongated piezo bender.
6. The haptic device according to claim 5 , wherein the mass is positioned in between the first holder and the second holder.
7. The haptic device according to claim 5 , wherein the mass is positioned at or near the first end of the elongated piezo holder.
8. The haptic device according to claim 5 , further comprising a first actuator configured to move the first holder towards and away from the second holder to vary the distance between the first holder and the second holder.
9. The haptic device according to claim 8 , further comprising a second actuator configured to move the second holder towards and away from the first holder to vary the distance between the first holder and the second holder.
10. The haptic device according to claim 5 , wherein the first holder comprises a plurality of first holders located on one side of the mass, and the second holder comprises a plurality of second holders located on the other side of the mass as the first holder, and wherein different ones of the plurality of first holders are actuated and different ones of the plurality of second holders are actuated to vary the holding distance.
11. The haptic device according to claim 5 , wherein the mass is located on one side of the elongated piezo bender.
12. The haptic device according to claim 11 , wherein the mass has a non-uniform thickness.
13. The haptic device according to claim 12 , wherein the mass has a non-uniform thickness in a direction along a major axis of the elongated piezo bender.
14. The haptic device according to claim 12 , wherein the mass has a cross-sectional C-shape in a direction along a minor axis of the elongated piezo bender.
15. The haptic device according to claim 5 , further comprising a pair of dampers, wherein each damper is located in between one end of the mass and the elongated piezo bender.
16. A haptic device, comprising:
an elongated piezo bender supported by a first holder and a second holder, the first holder and the second holder being spaced apart from each other and located at or near opposite ends of the elongated piezo bender;
a mass supported by the elongated piezo bender and positioned in between the first holder and the second holder, the mass having a non-uniform thickness in a direction along a minor axis of the elongated piezo bender so that portions of the mass at least partially surround the elongated piezo bender; and
an electrical driving signal generator configured to generate a signal to create a vibration in the elongated piezo bender.
17. The haptic device according to claim 16 , wherein the mass has a cross-sectional C-shape in a direction along a minor axis of the elongated piezo bender.
18. The haptic device according to claim 16 , further comprising a rigid connector in between a center of the mass and the elongated piezo bender.
19. The haptic device according to claim 16 , further comprising a pair of dampers, wherein each damper is located in between one end of the mass and the elongated piezo bender.