Mechanism for fine tracking a head that records and reproduces on a disc, and disc drive having the mechanism
AssigneeFujitsu Limited
InventorShinji Koganezawa
Life of this patent
Estimating the term…
Abstract
A fine positioning mechanism is provided in a disc drive for driving a head that records data onto and reproduces data from a disc. The mechanism includes a base fixed to an arm and a suspension, the base connecting the suspension to the arm, the arm swinging around a rotary shaft, and the suspension supporting the head. A drive part is located above the base, for deforming the base, the drive part including a shear type piezoelectric element that is polarized in a direction orthogonal to a thickness direction of the piezoelectric element, and deforms top and bottom surfaces of the piezoelectric element perpendicular to the thickness direction when voltage is applied to the piezoelectric element in the thickness direction.
Claims14
A mechanism, provided in a disc drive, for driving a head that records data onto and reproduces data from a disc, said mechanism comprising:
- a base fixed to an arm and a suspension, the base connecting the suspension to the arm, the arm swinging around a rotary shaft, and the suspension supporting the head;
- and
- a drive part, located adjacent the base, for deforming said base, said drive part including a shear type piezoelectric element that is polarized in a direction orthogonal to a thickness direction of the piezoelectric element, and deforms top and bottom surfaces of the piezoelectric element perpendicular to the thickness direction when voltage is applied to the piezoelectric element in the thickness direction.
A mechanism, provided in a disc drive, for driving a head that records data onto and reproduces data from a disc, said mechanism comprising:
- a base that connects a suspension to an arm, the suspension supporting the head, and the arm swinging around a rotary shaft;
- two pairs of shear type piezoelectric elements for moving the suspension, the shear type piezoelectric element being polarized in a direction orthogonal to a thickness direction of the piezoelectric element, and deforming top and bottom surfaces of the piezoelectric element perpendicular to the thickness direction when voltage is applied to the piezoelectric element in the thickness direction, each pair of shear type piezoelectric elements having a fixed piezoelectric element and a mobile piezoelectric element, and the fixed and mobile piezoelectric elements having opposite polarization directions;
- and
- a pair of piezoelectric-element coupling plates that connect two shear type piezoelectric elements in each pair to each other.
A disc drive comprising;
- a head that records data onto and reproduces data from a disc;
- an arm that swings around a rotary shaft;
- a suspension that supports said head;
- and
- a mechanism for driving said head, said mechanism including:
- a base fixed to said arm and suspension and connecting said suspension to said arm;
- and
- a drive part, located above the base, for deforming said base, said drive part including a shear type piezoelectric element that is polarized in a direction orthogonal to a thickness direction of the piezoelectric element, and deforms top and bottom surfaces of the piezoelectric element perpendicular to the thickness direction when voltage is applied to the piezoelectric element in the thickness direction.
A disc drive comprising:
- a head that records data onto and reproduces data from a disc;
- an arm that swings around a rotary shaft;
- a suspension that supports said head;
- and
- a mechanism for driving said head, said mechanism including:
- a base that connects the suspension to the arm;
- two pairs of shear type piezoelectric elements for moving the suspension, the shear type piezoelectric element being polarized in a direction orthogonal to a thickness direction of the piezoelectric element, and deforming top and bottom surfaces of the piezoelectric element perpendicular to the thickness direction when voltage is applied to the piezoelectric element in the thickness direction, each pair of shear type piezoelectric elements having a fixed piezoelectric element and a mobile piezoelectric element, and the fixed and mobile piezoelectric elements having opposite polarization directions;
- and
- a pair of piezoelectric-element coupling plates that connect the two shear type piezoelectric elements in each pair to each other.
Dependencies are inferred from the claim text.