Calibration standard for flying height tester having a wedge sli

Details Calibration standard for flying height tester having a wedge sli Calibration standard for flying height tester having a wedge sli

1994-01-24

1995-04-25

Turner, Samuel A.

Optics: measuring and testing

Standard

356357, G01J 102

Patent

active

054104025

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.

REFERENCES:
patent: 4346996 (1982-08-01), Miller
patent: 4624564 (1986-11-01), Dahlgren
patent: 5220408 (1993-06-01), Mager
Fumitaka Muranushi, Katsuyuki Tanaka, Yoshinori Takeuchi, Estimation of the Zero-Spacing Error Due to a Phase Shift of Reflected Light in Measuring a Magnetic Head Slider's Flying Height by Light Interference, Adv. Info. Storage Syst., vol. 4, 1992 American Society of Mechanical Engineers.

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