Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Peizoelectric microactuator and sensor failure detection in disk drives

a technology of piezoelectric microactuators and sensors, applied in the field of disk drive testing, can solve problems such as faulty connection and/or circuitry in closed loop systems, and achieve the effect of reliable yet efficien

Inactive Publication Date: 2003-04-24
GUO WEI +1
View PDF0 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0009] In view of the foregoing, a broad objective of the present invention is to provide a test device and method for testing PZT microactuators and / or sensors to detect failures in the same. Another object of the present invention is to provide a reliable yet efficient test device and method for testing PZT microactuators and / or sensors in disk drives prior to shipping the drives to a customer(s). A related objective is to provide a test device and method for measuring the mechanical resonance of PZT microactuators and / or sensors for comparison to a predetermined mechanical resonance for an operational PZT microactuator and / or sensor.

Problems solved by technology

Further, if no test measure is received in response to providing the reference signal to the first one of the PZT elements, it is known that a connection and / or the circuitry in the closed loop system is faulty.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Peizoelectric microactuator and sensor failure detection in disk drives
  • Peizoelectric microactuator and sensor failure detection in disk drives
  • Peizoelectric microactuator and sensor failure detection in disk drives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Reference will now be made to the accompanying drawings, which assist in illustrating the various pertinent features of the present invention. Although the present invention will now be described primarily in conjunction with disk drives, it should be expressly understood that the present invention may be applicable to other applications where testing of a PZT microactuator having two PZT elements is required / desired. Additionally, for purpose of clarity the present invention will now be described in conjunction with the testing of a disk drive microactuator having two piezoelectric elements. It will be appreciated, however, that the principles described below apply equally to testing of a disk drive sensor that includes two piezoelectric elements, although such discussion is omitted to avoid redundancy. In this regard, the following description of a disk drive is presented for purposes of illustration and description. Furthermore, the description is not intended to limit the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
voltageaaaaaaaaaa
voltagesaaaaaaaaaa
frequencyaaaaaaaaaa
Login to View More

Abstract

A test device and method for testing one of a disk drive microactuator and a disk drive sensor that includes two piezoelectric elements. The test device includes a signal generator, signal analyzer, and a user interface. The test device is operational to provide a reference signal (e.g. an electrical signal) to one of the piezoelectric elements in the microactuator and obtain a test measure from the other one of the piezoelectric elements. The test measure is then utilized to assess a performance parameter for the microactuator. The test measure is generated by the other one of the piezoelectric elements in response to the reference signal provided to the first one of the piezoelectric elements. In one embodiment of the invention, the test measure is a signal generated in response to the reference signal that may be compared to a known response signal of an operational microactuator to determine operational characteristics of a subject microactuator such as circuitry operation and / or damage to the microactuator.

Description

RELATED APPLICATIONS[0001] This patent application claims priority from U.S. Patent Application Serial No. 60 / 345,037, that was filed on Oct. 23, 2001, and that is entitled "PZT MICROACTUATOR FAILURE DETECTION BY MEASURING PZT GENERATED VOLTAGE." The entire disclosure of U.S. Patent Application Serial No. 60 / 345,037 is incorporated by reference herein.FIELD OF THE INVENTION[0002] The present invention generally relates to testing of disk drives, and more particularly, to testing and detecting failures in piezoelectric microactuators and piezoelectric sensors of disk drives.BACKGROUND OF THE INVENTION[0003] Conventional disk drives typically include a base plate and a cover that is detachably connected to the base plate to define an enclosure for various disk drive components. One or more data storage disks are generally mounted on a spindle which is rotatably interconnected with the base plate and / or cover so as to allow the data storage disk(s) to rotate relative to both the base p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): G01R31/28G11B20/18G11B27/36
CPCG01R31/2829G11B20/1816G11B27/36G11B2220/20
Inventor GUO, WEIHATCH, MICHAEL R.
Owner GUO WEI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com