Head gimbal assembly and disk drive with a piezoelectric element
A head gimbal assembly having a stage fixed to a head-slider. A piezoelectric element which comprises; an upper surface, a first side surface, a second side surface, a lower surface, a first electrode, a second electrode, and a gap between the first and second electrodes on the lower surface, the piezoelectric element moving the stage by extension or contraction thereof according to a voltage applied to the first and second electrodes. A transmission wiring part which has a connection pad for the piezoelectric element. A cross-connector for physically and electrically cross-connecting the first electrode and the connection pad. An adhesive fixing part which is formed from an insulating adhesive and adhesively fixes the lower surface of the piezoelectric element to the transmission wiring part, between an end of the second electrode at the gap and the cross-connector.
1. A head gimbal assembly which comprises:
a gimbal having a stage;
a head-slider which is fixed to said stage;
a piezoelectric element which comprises,
an upper surface,
a first side surface,
a second side surface which is a surface opposite said first side surface,
a lower surface,
a first electrode which is formed on at least said upper surface and said first side surface,
a second electrode which is formed on at least said second side surface and said lower surface, and
a gap between said first and second electrodes on said lower surface, said piezoelectric element moving said stage by extension or contraction thereof according to a voltage applied to said first and second electrodes;
a transmission wiring part which has a connection pad for said piezoelectric element;
a cross-connector for physically and electrically cross-connecting said first electrode and said connection pad; and
an adhesive fixing part which is formed from an insulating adhesive and adhesively fixes said lower surface of said piezoelectric element to said transmission wiring part, between an end of said second electrode at said gap and said cross-connector.
2. The head gimbal assembly of claim 1 , wherein a part of said first electrode is formed on said lower surface of said piezoelectric element; and
said cross-connector cross-connects said part of said first electrode and said connection pad.
3. The head gimbal assembly of claim 1 , wherein said cross-connector and said adhesive fixing part are in contact.
4. The head gimbal assembly of claim 1 , wherein said transmission wiring part comprises a spacer which projects toward said head-slider and supports said head-slider.
5. The head gimbal assembly of claim 4 , wherein said spacer is formed on an insulating layer of said transmission wiring part.
6. The head gimbal assembly of claim 4 , wherein said adhesive fixing part is formed between said spacer and said cross-connector.
7. The head gimbal assembly of claim 1 , which further comprises a sealing part for covering said cross-connector.
8. The head gimbal assembly of claim 7 , wherein said sealing part adhesively fixes said piezoelectric element and said transmission wiring part.
9. The head gimbal assembly of claim 1 , which further comprises:
a second cross-connector for electrically cross-connecting said second electrode and a second connection pad of said transmission wiring part; and
a second adhesive fixing part which lies between said second cross-connector and said adhesive fixing part, and adhesively fixes said lower surface of said piezoelectric element to said transmission wiring part.
10. The head gimbal assembly of claim 1 , wherein said piezoelectric element is disposed on a reverse of a surface of said transmission wiring part where said head-slider is connected, at a rear side of said stage, and extends and contracts in a front-to-rear direction of a suspension; and
said head gimbal assembly further comprises a second piezoelectric element which is disposed in a line in a left-to-right direction with said piezoelectric element on said reverse of said surface of said transmission wiring part at said rear side of said stage, and which extends and contracts in said front-to-rear direction.
11. A disk drive comprising:
an enclosure;
a spindle motor which is fixed inside said enclosure and rotates a disk;
an actuator which is provided with a suspension for supporting a head-slider above said disk rotated by said spindle motor, and which is pivoted by means of a voice coil motor, wherein:
said suspension comprises:
a head gimbal assembly having a stage to which said head-slider is fixed;
a piezoelectric element which comprises,
an upper surface,
a first side surface,
a second side surface which is a surface opposite said first side surface,
a lower surface,
a first electrode which is formed on at least said upper surface and said first side surface,
a second electrode which is formed on at least said second side surface and said lower surface, and
a gap between said first and second electrodes on said lower surface, said piezoelectric element moving said stage by extension or contraction thereof according to a voltage applied to said first and second electrodes;
a transmission wiring part which has a connection pad for said piezoelectric element;
a cross-connector for physically and electrically cross-connecting said first electrode and said connection pad; and
an adhesive fixing part which is formed from an insulating adhesive and adhesively fixes said lower surface of said piezoelectric element to said transmission wiring part, between an end of said second electrode at said gap and said cross-connector.
12. The disk drive of claim 11 , wherein a part of said first electrode is formed on said lower surface of said piezoelectric element, and
said cross-connector cross-connects said part of said first electrode and said connection pad.
13. The disk drive of claim 11 , wherein said cross-connector and said adhesive fixing part are in contact.
14. The disk drive of claim 11 , wherein said transmission wiring part comprises a spacer which projects toward said head-slider and supports said head-slider.
15. The disk drive of claim 11 , which further comprises a sealing part for covering said cross-connector.
16. The disk drive of claim 11 , which further comprises:
a second cross-connector for electrically cross-connecting said second electrode and a second connection pad of said transmission wiring part; and
a second adhesive fixing part which lies between said second cross-connector and said adhesive fixing part, and adhesively fixes said lower surface of said piezoelectric element to said transmission wiring part.
17. The disk drive of claim 11 , wherein said piezoelectric element is disposed on a reverse surface of said transmission wiring part to where said head-slider is connected, at a rear side of said stage, and extends in a front-to-rear direction of said stage; and
said head gimbal assembly further comprises a second piezoelectric element which is disposed in a line in a left-to-right direction with said piezoelectric element on said reverse surface of said transmission wiring part at said rear side of said stage, and which extends and contracts in said front-to-rear direction.