Compact microactuator head assembly
View Patent ↗Method and apparatus for a head gimbal assembly (HGA) which incorporates a microactuator. In accordance with various embodiments, a gimbal assembly has a gimbal island disposed within an aperture of a gimbal plate, which is mechanically decoupled from the gimbal island. At least one microactuator element is attached between the gimbal island and the gimbal plate to allow rotation of the gimbal island independent of the gimbal plate. The gimbal assembly is suspended from a dimple which extends from the gimbal island.
1. A method comprising:
providing a gimbal island disposed within an aperture of a gimbal plate, the gimbal island being mechanically decoupled from the gimbal plate;
attaching a microactuator element to the gimbal island and the gimbal plate to allow rotation of the gimbal island independent of the gimbal plate; and
suspending the gimbal assembly with a dimple which extends from the gimbal island.
2. The method of claim 1 , wherein the aperture has a continuously extending sidewall that encloses the gimbal island.
3. The method of claim 1 , wherein a center of rotation of the gimbal island corresponds with a center of rotation of the dimple.
4. The method of claim 1 , wherein the microactuator element includes a piezoelectric layer and a non-piezoelectric layer.
5. The method of claim 1 , wherein the gimbal island has a slider attached thereto adjacent the microactuator element.
6. The method of claim 1 , wherein the microactuator element is characterize as a first microactuator element, and wherein the attaching step further comprises attaching a second microactuator element to the gimbal island and the gimbal plate in parallel spaced apart relation to the first microactuator element.
7. The method of claim 6 , wherein the attaching step further comprises attaching a slider having an air bearing surface to the gimbal island between the first and second microactuator elements.
8. The method of claim 1 , wherein a flex circuit spans the aperture to provide multiple independent circuits to the gimbal island.
9. The method of claim 8 , wherein the flex circuit deforms in response to deflection of the gimbal island.
10. The method of claim 1 , wherein activation of the microactuator element induces movement of the gimbal island independent of the gimbal plate.
11. A gimbal assembly comprising:
a gimbal island disposed within an aperture of a gimbal plate, the gimbal island being mechanically decoupled from the gimbal plate;
spaced apart first and second microactuator elements each attached between the gimbal island and the gimbal plate to allow rotation of the gimbal island independent of the gimbal plate; and
a dimple which extends from the gimbal island to suspend the gimbal assembly.
12. The apparatus of claim 11 , wherein the microactuator elements are electrically connected to a flex circuit and include a piezoelectric layer and a non-piezoelectric layer.
13. The apparatus of claim 11 , further comprising a slider having an air bearing surface and supporting a data transducing element, the slider connected to the gimbal island between the first and second microactuator elements.
14. The apparatus of claim 11 , wherein the first microactuator element is configured with a first polarity and the second microactuator element is configured with a second polarity opposed to the first polarity.
15. The apparatus of claim 14 , wherein upon activation the first microactuator element extends to increase its length while the second microactuator element contracts to decrease its length.
16. The apparatus of claim 11 , wherein the first and second microactuator elements are concurrently activated by a common voltage applied thereto.
17. The apparatus of claim 12 , wherein the non-piezoelectric layer forces the microactuator elements to bend from and return to a default position about a piezoelectric neutral axis.
18. A method comprising:
providing a gimbal island disposed within an aperture of a gimbal plate, the gimbal island being mechanically decoupled from the gimbal plate;
attaching first and second microactuator elements between the gimbal island and the gimbal plate and a slider to the gimbal island between said first and second microactuator elements;
suspending the gimbal assembly with a dimple which extends from the gimbal island; and
activating the microactuators to rotate the gimbal island and the slider about the dimple.
19. The method of claim 18 , wherein the microactuator elements are secured to an attachment pad on both the gimbal island and gimbal plate so that a width of each microactuator contactingly engages the attachment pads, the width of each microactuator element being less than a length thereof and greater than a height thereof.
20. The method of claim 18 , wherein the first and second microactuator elements are concurrently activated by a common voltage applied thereto.