Christopher C Zahn

US Patent:

54538319, Sep 26, 1995

Filed:

Sep 9, 1994

Appl. No.:

8/303418

Inventors:

Yufeng Li - Eden Prairie MN
Peter R. Goglia - Edina MN
Christopher C. Zahn - Minneapolis MN

Assignee:

Seagate Technology, Inc. - Scotts Valley CA

International Classification:

G01J 102
G01B 1102

US Classification:

356243

Abstract:

A calibration standard for uniformly calibrating flying height testers. The calibration standard includes a wedge slider held in contact with a glass disc by a load bridge, load spring and cover case. The wedge slider has a first rail and a second rail extending along its length and has a raised end to form an optical wedge between the glass disc and the first and second rails. A profilometer is used to map any surface irregularities on the surfaces of the first and second rails facing the disc, allowing the calculation of an accurate expected distance, or flying height, between the surfaces and the disc at each horizontal location along the length of the wedge slider. The expected flying height is compared to a flying height measured through optical interference techniques to calibrate the flying height tester.

US Patent:

54104025, Apr 25, 1995

Filed:

Jan 24, 1994

Appl. No.:

8/184995

Inventors:

Yufeng Li - Eden Prairie MN
Peter R. Goglia - Edina MN
Christopher C. Zahn - Minneapolis MN

Assignee:

Seagate Technology, Inc. - Scotts Valley CA

International Classification:

G01J 102

US Classification:

356243

Abstract:

A calibration standard for uniformly calibrating flying height testers. The calibration standard includes a wedge slider held in contact with a glass disc by a load bridge, load spring and cover case. The wedge slider has a first rail and a second rail extending along its length and has a raised end to form an optical wedge between the glass disc and the first and second rails. A profilometer is used to map any surface irregularities on the surfaces of the first and second rails facing the disc, allowing the calculation of an accurate expected distance, or flying height, between the surfaces and the disc at each horizontal location along the length of the wedge slider. The expected flying height is compared to a flying height measured through optical interference techniques to calibrate the flying height tester.