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Actuator using piezoelectric element and head-positioning mechanism using the actuator

A technology of piezoelectric elements and positioning mechanisms, applied in the direction of piezoelectric effect/electrostrictive or magnetostrictive motors, electrical components, generators/motors, etc., can solve problems such as high dimensional accuracy

Inactive Publication Date: 2004-08-25
TOSHIBA STORAGE DEVICE CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the machining of the arm also requires high dimensional accuracy and also requires a coupling plate with considerable stiffness in expansion and contraction
The problem that arises is that in order to obtain the predetermined stroke in the head positioning mechanism, considerable force is required

Method used

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  • Actuator using piezoelectric element and head-positioning mechanism using the actuator
  • Actuator using piezoelectric element and head-positioning mechanism using the actuator
  • Actuator using piezoelectric element and head-positioning mechanism using the actuator

Examples

Experimental program
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Effect test

Embodiment Construction

[0162] Before describing the preferred embodiment, a description with Figures 24 to 29 A common head actuator for the head positioning mechanism shown.

[0163] It has been proposed that in conventional disk drives, a second actuator which follows the magnetic track is mounted on the front end of the head actuator arm. This second actuator is capable of finely moving the magnetic head at the front end of the arm independently of the movement of the magnetic head actuator.

[0164] Figure 24 A head actuator disclosed in JP-A-3-69072 is shown, in which, in addition to the main actuator 110 of the magnetic disk drive 100, there is a sub-actuator 120 mounted on the front end of an arm 111. The sub-actuator 120 is adapted to slowly move the magnetic head 114 using two multilayer piezoelectric elements 123 . The sub-actuator 120 includes two multi-layer piezoelectric elements, and each piezoelectric element 123 is composed of a plurality of piezoelectric elements adapted to mov...

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PUM

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Abstract

An actuator having a simple configuration requiring no high dimensional accuracy, high in positioning accuracy and low in cost, and a head-positioning mechanism using the actuator are disclosed. An actuator according to a first application comprises a shear-type piezoelectric element of predetermined thickness and an opposed electrode formed on two electrodes in spaced relationship on a base member. The opposed electrode is displaced in accordance with the direction of polarization of the shear-type piezoelectric element upon applying a voltage between the two electrodes. The opposed electrode thus constitutes an operating section of the actuator. An actuator according to a second application comprises a movable member arranged on a drive member including a shear-type piezoelectric element on a base member. The drive member includes a plurality of layers of piezoelectric elements polarized in alternately opposite directions perpendicular to the thickness of the devices. A plurality of conductive layers are formed adjacently to the respective layers of the devices to permit voltage application thereto. The movable member can be driven in parallel to the base member upon application of a voltage between the conductive layers. Any one of these actuators can be incorporated as a part of the head actuator to constitute a head-positioning mechanism capable of displacing the head by a minuscule distance independently of the operation of the head actuator.

Description

[0001] This application is a divisional application filed by Fujitsu Co., Ltd. on April 17, 1998, entitled "Actuator Using Piezoelectric Elements and Magnetic Head Positioning Mechanism Using Such Actuator". technical field [0002] The present invention relates to an actuator using a piezoelectric element and a magnetic head positioning mechanism using the actuator. More particularly, the present invention relates to an actuator using a piezoelectric element capable of high-precision positioning and a magnetic head positioning mechanism using the same. Background technique [0003] In recent years, the precision of information equipment has increased, and an actuator capable of operating over a small distance has been required. For example, actuators that correct the focus of an optical system or control the tilt angle of an optical system, or magnetic head actuators of printers and magnetic disk drives are required to be able to control their operations with high precision...

Claims

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Application Information

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IPC IPC(8): G11B21/02G11B5/55G11B21/10H02N2/02H02N2/04
CPCH01L41/0993G11B5/5552G11B21/106H10N30/208G11B5/483G11B5/5521G11B21/16G11B2220/2516
Inventor 小金泽新治公平彻山田朋良植松幸弘野口忠良中野寿阪本竜马井上淳一铃木彻也
Owner TOSHIBA STORAGE DEVICE CORP
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