Electricity: measuring and testing – Magnetic – Magnetic information storage element testing
Reexamination Certificate
2000-01-24
2002-02-05
Patidar, Jay (Department: 2862)
Electricity: measuring and testing
Magnetic
Magnetic information storage element testing
C360S097010
Reexamination Certificate
active
06344738
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to memory disk test systems and more particularly to a system for performing tests on disks utilizing non-magnetic motors.
BACKGROUND OF THE INVENTION
Currently, a test system for a disk utilized in a disk drive product utilizes magnetic motors such as a DC servo motor, either brush or brushless type, to perform all the motions of the head. A Single Disk Test (SDT) system is used to certify that all disks will perform to the product specification when they are installed in hard disk drive products. The Single Disk Test system performs at least the following processes and tests: (1) surface polishing, (2) surface imperfection testing and (3) data read/write testing utilizing a plurality of scanner systems. Each of these tests is described in detail hereinbelow.
Conventional SDT systems utilize electric motors for each of the scanner systems. Electric motors produce inductive fields when moving the fixture on top of the disk for the various processes and tests. Since the disk contains magnetic properties, the disk is sensitive to the inductive fields. In addition, motors utilized to move the process and test fixtures are typically large in order to move the fixtures appropriately and therefore add significantly to the size of the system. Finally such motors must remain on during the tests. It is desirable to reduce the size of the test system as hard drive products become smaller.
Accordingly, what is needed is a system and method for overcoming the above-identified problems. The present invention addresses such a need.
SUMMARY OF THE INVENTION
A system for use in a memory disk test system is disclosed. The system comprises a fixture for holding a disk head and a moveable slide coupled to the fixture. The system includes a non-magnetic motor system engageably coupled to the slide for moving the test fixture.
A system and method in accordance with the present invention offers an SDT system which utilizes piezoelectric motors resulting in higher throughput in producing memory disks. The system and method further achieves high performance, is lower cost in implementation, and is more compact than conventional SDT systems. The system and method, by removing time delay, offers the advantage of cycle time reduction over conventional SDT systems.
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Koganezawa et al., “Dual-Stage Actuator System for Magnetic Disk Drives Using a Shear Mode Piezoelectric Microactuator”, IEEE, vol. 35, No. 2, Mar. 1999.
Garcia Jose H.
Mello Tony
O'Brien Eric C.
Perrault Joseph D.
Robinson Bob C.
Patidar Jay
Sawyer Law Group LLP
Tomlin Richard A.
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