Head support mechanism and thin film piezoelectric actuator
View Patent ↗A head support mechanism includes a slider for carrying a head at least for performing reproduction of data from a disk, and a holding portion for holding the slider. The holding portion includes: a first portion including a first piezoelectric element; a second portion including a second piezoelectric element; a third portion connected to the first and second portions, the slider being provided on the third portion; and a fixing portion for fixing the first and second portions. At least one of the first and second piezoelectric elements is contracted and expanded in a direction substantially parallel to a surface of the disk, in the presence of an applied voltage so that the slider provided on the third portion is rotated around a predetermined center of rotation.
1. A disk apparatus comprising:
a head for performing recording and/or reproduction of data to and from a disk, and
a head support mechanism including a slider having the head attached thereto, a slider holding plate for holding the slider, a pair of substrates each having a piezoelectric element attached thereto, a pair of elastic hinges for connecting the slider holding plate and the pair of substrates, and a dimple for supporting the slider holding plate such that the slider holding plate is rotated in a pitch direction, a roll direction, and a yaw direction;
wherein each of the piezoelectric elements is integrally formed of a first element provided with first and second electrodes on both planes of a first piezoelectric section, and a second element provided with third and fourth electrodes on both planes of a second piezoelectric section, with the second electrode and the fourth electrode being placed facing each other,
wherein a driving voltage is loaded on the first and the third electrodes, and a ground voltage is loaded on the second and the fourth electrodes to make contraction and/or expansion of each of the piezoelectric sections of the pair of piezoelectric elements, and
wherein the slider is rotated around the dimple in the yaw direction by contraction and/or expansion of at least one of the piezoelectric elements.
2. A disk apparatus according to claim 1 , wherein the pair of piezoelectric elements are respectively loaded on driving voltages each having an opposite phase with each other.
3. A disk apparatus according to claim 1 , wherein the dimple is provided in a tip portion of a load beam for supporting the slider holding plate.
4. A disk apparatus according to claim 3 , wherein the load beam includes a pair of regulation portions for regulating the rotation of the slider holding plate.
5. A disk apparatus according to claim 1 , wherein root portions of the pair of substrates are mounted on a substrate of metal type.
6. A disk apparatus according to claim 1 , wherein the pair of substrates and the elastic hinges are formed of an identical material.
7. A disk apparatus according to claim 1 , wherein a conductor pattern for transmitting a recording and/or reproduction signal to and from the head is uniformly molded with the substrate by resin.
8. A disk apparatus according to claim 1 , wherein each of the piezoelectric elements is integrally formed of the first element and the second element through an adhesion agent or a thermal melting technique using ultrasonic vibration between the second electrode and the fourth electrode.