Browse Prior Art Database

Magnetic Flight-Height Reference Standard

IP.com Disclosure Number: IPCOM000043817D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Kuenzel, U: AUTHOR [+3]

Abstract

This device provides a stable, non-deteriorating calibration standard for optical flight-height testers. For measuring the flight height of magnetic heads, optical testers are widely used. Standard test heads have been used to correlate testers. The heads are flown over a rotating glass plate. Because of the head wear on the moving glass plate, the flight height of standard heads may change in the course of time. The present proposal provides for a stable standard air gap between magnetic head and glass plate. The flight-height standard consists of a magnetic head with suspension 1, an optically flat glass plate 2, a flow-controlled air jet 3, and a cylindrical container 4 for these components. The magnetic head is fixed to the frame by means of a normal head suspension.

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Magnetic Flight-Height Reference Standard

This device provides a stable, non-deteriorating calibration standard for optical flight-height testers. For measuring the flight height of magnetic heads, optical testers are widely used. Standard test heads have been used to correlate testers. The heads are flown over a rotating glass plate. Because of the head wear on the moving glass plate, the flight height of standard heads may change in the course of time. The present proposal provides for a stable standard air gap between magnetic head and glass plate. The flight-height standard consists of a magnetic head with suspension 1, an optically flat glass plate 2, a flow- controlled air jet 3, and a cylindrical container 4 for these components. The magnetic head is fixed to the frame by means of a normal head suspension. The suspension must supply a small static loading force. The air flow causes the head to separate from the glass plate in response to Bernoulli forces counteracting the static loading force. The distance (air gap) between head and glass plate is determined by the air velocity and the aerodynamic characteristics of the particular head surface. This fixed air gap can then be used as a standard for calibrating optical air gap testers.

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