Acceleration sensor and disk drive employing it

A disk drive comprising at least one recording disk that is rotatively borne on a base thereof, a carriage borne on the base so that it can pivot, and a head suspension having a head, which is used to read or write information from or in the disk, formed at one end thereof and being attached to the distal part of an arm included in the carriage, wherein:

• an acceleration sensor comprising at least one shearing piezoelectric element having an electrode formed on both sides thereof, said element detecting acceleration of a horizontal motion made by the head actuator, a first attachment member interposed between one of the electrodes of the shearing piezoelectric element and the surface of the distal part of the carriage arm, and a second attachment member interposed between the other electrode of the shearing piezoelectric element and the proximal part of the head suspension is attached to the joint between the distal part of the carriage arm and the head suspension;
• and
• either a voltage amplifier or a charge amplifier is disposed on a signal path along which a signal produced by the acceleration sensor is transmitted.

A disk drive comprising at least one recording disk that is rotatively borne on a base thereof, a carriage borne on the base so that it can pivot, and a head suspension having a head, which is used to read or write information from or in the disk, formed at one end thereof and being attached to the distal part of an arm included in the carriage, wherein:

• an acceleration sensor comprising at least one shearing piezoelectric element that has an electrode formed on both sides thereof, said element detecting acceleration of a horizontal motion made by the head actuator and being polarized in a direction orthogonal to the longitudinal directions of the carriage arm, a first attachment member interposed between one of the electrodes of the shearing piezoelectric element and the surface of the distal part of the carriage arm, and a second attachment member interposed between the other electrode of the shearing piezoelectric element and the proximal part of the head suspension is attached to the joint between the distal part of the carriage arm and the head suspension;
• and
• either a voltage amplifier or a charge amplifier is disposed on a signal path along which a signal produced by the acceleration sensor is transmitted.

A disk drive comprising at least one recording disk that is rotatively borne on a base thereof, a carriage borne on the base so that it can pivot, and a head suspension having a head, which is used to read or write information from or in the disk, formed at one end thereof and being attached to the distal part of an arm included in the carriage, wherein:

• an acceleration sensor comprising at least one shearing piezoelectric element unit that has an electrode formed on both sides thereof, said element unit detecting acceleration of a horizontal motion made by the head actuator and comprising two shearing piezoelectric elements which are polarized in mutually opposite directions parallel to the longitudinal directions of the carriage, a first attachment member interposed between the electrode on one side of the shearing piezoelectric element unit and the surface of the distal part of the carriage arm, and a second attachment member interposed between the electrode on the other side of the shearing piezoelectric element unit and the proximal part of the head suspension is attached to the joint between the distal part of the carriage arm and the head suspension;
• and
• either a voltage amplifier or a charge amplifier is disposed on a signal path along which a signal produced by the acceleration sensor is transmitted.

A disk drive comprising at least one recording disk that is rotatively borne on a base thereof, a carriage borne on the base so that it can pivot, and a head suspension having a head, which is used to read or write information from or in the disk, formed at one end thereof and being attached to the distal part of an arm included in the carriage, wherein:

• an acceleration sensor comprising at least one shearing piezoelectric element unit that has an electrode formed on both sides thereof, said element unit detecting acceleration of a horizontal motion made by the head actuator and comprising two shearing piezoelectric elements which are polarized in mutually opposite directions orthogonal to the longitudinal directions of the carriage, a first attachment member interposed between the electrode on one side of the shearing piezoelectric element unit and the surface of the distal part of the carriage arm, and a second attachment member interposed between the electrode on the other side of the shearing piezoelectric element unit and the proximal part of the head suspension is attached to the joint between the distal part of the carriage arm and the head suspension;
• and
• either a voltage amplifier or a charge amplifier is disposed on a signal path along which a signal produced by the acceleration sensor is transmitted.

A disk drive comprising at least one recording disk that is rotatively borne on a base thereof, a carriage borne on the base so that it can pivot, and a head suspension having a head, which is used to read or write information from or in the disk, formed at one end thereof and being attached to the distal part of an arm included in the carriage, wherein:

• an acceleration sensor comprising at least one shearing piezoelectric element realized with a shearing piezoelectric element that has an electrode formed on both sides thereof, said element detecting acceleration of a horizontal motion made by the head actuator and being internally polarized in mutually opposite directions parallel to the longitudinal directions of the carriage, a first attachment member interposed between the electrode on one side of the shearing piezoelectric element and the surface of the distal part of the carriage arm, and a second attachment member interposed between the electrode on the other side of the shearing piezoelectric element and the proximal part of the head suspension is attached to the joint between the distal part of the carriage arm and the head suspension;
• and
• either a voltage amplifier or a charge amplifier is disposed on a signal path along which a signal, produced by the acceleration sensor, is transmitted.

A disk drive comprising at least one recording disk that is rotatively borne on a base thereof, a carriage borne on the base so that it can pivot, and a head suspension having a head, which is used to read or write information from or in the disk, formed at one end thereof and being attached to the distal part of an arm included in the carriage, wherein:

• an acceleration sensor comprising at least one shearing piezoelectric element realized with a shearing piezoelectric element that has an electrode formed on both sides thereof, said element detecting acceleration of a horizontal motion made by the head actuator and being internally polarized in mutually opposite directions orthogonal to the longitudinal directions of the carriage, a first attachment member interposed between the electrode on one side of the shearing piezoelectric element and the surface of the distal part of the carriage arm, and a second attachment member interposed between the electrode on the other side of the shearing piezoelectric element and the proximal part of the head suspension is attached to the joint between the distal part of the carriage arm and the suspension;
• and
• either a voltage amplifier or a charge amplifier is disposed on a signal path along which a signal, produced by the acceleration sensor, is transmitted.