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Metal Working

Tracking-device-using-multiple-piezoelectric-elements-for-track-centering

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Tracking device using multiple piezoelectric elements for track centering

Details

Inventors: Kimura, Kenji;
Assignee: Olympus Optical Co., Ltd. (Tokyo, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

A tracking device comprises a frame having a pair of opposed legs, a magnetic head disposed midway between the pair legs and a pair of piezoelectric members sandwiching the magnetic head and clamped together with the head between the two legs of the frame. Opposite polarity voltages are applied to the piezoelectric members according to tracking information. The applied voltages cause expansion and contraction of the piezoelectric members to effect tracking control of the head.

DETAILED DESCRIPTION An object of the invention is to provide a tracking device, which permits stable tracking without being influenced by the external force produced when the magnetic head is brought into contact with the recording surface.
According to the invention, there is provided a tracking device, which controls the tracking of the magnetic head by making use of a thickness extensional mode of piezoelectric elements.
According to the invention, there is also provided a tracking device, with which high mechanical strength of the element for driving the magnetic head can be ensured without the need for increasing the length of the element and which can also be readily assembled and adjusted.
According to the invention, there is further provided a tracking device, in which the magnetic head is sandwiched between first and second piezoelectric members, and opposite polarity voltages are applied to the first and second piezoelectric members according to tracking information so that the magnetic head is moved according to the deformation of the first and second piezoelectric members.

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