Slider with a transparent coating on a rail and a reflective mat

Details Slider with a transparent coating on a rail and a reflective mat Slider with a transparent coating on a rail and a reflective mat

1995-12-07

1997-10-07

Renner, Craig A.

Dynamic magnetic information storage or retrieval

Miscellaneous

360109, 360103, G11B 2124, G11B 1732

Patent

active

056754639

ABSTRACT:
A slider which has a totally reflective surface that can be used by an optical measuring system to measure the air bearing height of a head gimbal assembly ("HGA"). The slider has a rail with a recess area. The rail is coated with a first film that is thin enough to allow a light beam to transmit through the film and reflect from an interface within the slider. The recess contains a second film that does not transmit light so that a directed light beam is totally reflected from the second film. The outer air bearing surface of the first film is separated from the outer surface of the second film by a height H which is measured before the HGA is tested. The HGA is then placed adjacent to a rotating disk to create an air bearing with a height Hp. The outer surface of the second film is separated from the disk by a height Hv. An optical system directs a light beam into the recess to measure the height Hv between the disk and the outer surface of the second film. The air bearing height Hp is calculated by subtracting the known height H from the measured height Hv.

REFERENCES:
patent: 4630926 (1986-12-01), Tanaka et al.
patent: 4866553 (1989-09-01), Kubo et al.
patent: 5159508 (1992-10-01), Grill et al.
patent: 5410402 (1995-04-01), Li et al.

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