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Method of testing fitted state of piezoelectric element and head suspension

一种压电元件、安装状态的技术，应用在记录头的配置/安装、臂包括用于臂的执行机构等方向，能够解决难以检测故障、不能准确地确定头悬架101安装状态、不稳定等问题

Active Publication Date: 2012-05-30
NHK SPRING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on these unstable data, the mounting state of the piezoelectric elements 107a and 107b of the head suspension 101 cannot be accurately determined
[0017] In addition, it is difficult for the above-mentioned related art to detect a fault in the line connected to the actuator 109

Method used

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  • Method of testing fitted state of piezoelectric element and head suspension
  • Method of testing fitted state of piezoelectric element and head suspension
  • Method of testing fitted state of piezoelectric element and head suspension

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Embodiment Construction

[0044]The present invention detects a mounting state of a piezoelectric element mounted to form an actuator based on a capacitance change characteristic of the piezoelectric element with respect to a bias voltage varying within a predetermined range. In each embodiment, an example of a method of detecting the mounting state of a pair of piezoelectric elements mounted on a head suspension to form an actuator will be specifically described with reference to the drawings.

[0045] Figures 1A to 1C is a plan view showing the head suspension and the piezoelectric element mounted thereon. exist Figure 1A In , the head suspension is a normal product on which the piezoelectric element is properly mounted. exist Figure 1B In , the head suspension is a scrap (P-NG scrap) on which each piezoelectric element with the positive pole on top is incorrectly mounted. exist Figure 1C In , the head suspension was a scrap on which each piezoelectric element with the negative terminal on t...

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Abstract

A method of testing a fitted state of a pair of piezoelectric elements fitted to form an actuator between a base member and a movable member, the piezoelectric elements in the actuator are arranged side by side in opposite polarity and are electrically connected in parallel with each other, and when a voltage is applied to the piezoelectric elements, minutely moving the movable member relative to the base member in a direction in which the piezoelectric members are arranged side by side. The method detects changes in capacitance of the piezoelectric elements with respect to changes in bias voltage applied to the piezoelectric elements, the bias voltage is changed within a predetermined range, and determines a fitted state of the piezoelectric elements according to a characteristic of the detected capacitance changes. The method correctly and easily determines whether or not the piezoelectric elements are correctly fitted to the actuator.

Description

technical field [0001] The present invention relates to a method of detecting the mounting state of a piezoelectric element used when manufacturing, for example, a head suspension, which is a device provided in a disk drive of an information processing device such as a personal computer. The present invention also relates to a head suspension manufactured by detecting the mounting state of the piezoelectric element. Background technique [0002] Due to the rapid development of small-sized precision information equipment, the demand for micro-actuators capable of fine-distance positioning control has grown due to the use of such equipment. For example, optical systems that correct focus and tilt, inkjet printers that control ink heads, and disk drives that control heads specifically require microactuators. [0003] Disk drives increase storage capacity by increasing the number of tracks per inch (TPI), ie, by narrowing the width of each track on the disk. [0004] Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/55
CPCG11B5/4873
Inventor 新井干男
Owner NHK SPRING CO LTD