Browse Prior Art Database

Interferometer Alignment Tool

IP.com Disclosure Number: IPCOM000079122D
Original Publication Date: 1973-May-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Bowen, AJ: AUTHOR [+2]

Abstract

Interferometry is used to provide information on contact area size and location of a magnetic head relative to a rotatable magnetic flexible disk. Information is also provided on the "fly-height" of the rotating flexible disk relative to the fixed magnetic head.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 63% of the total text.

Page 1 of 2

Interferometer Alignment Tool

Interferometry is used to provide information on contact area size and location of a magnetic head relative to a rotatable magnetic flexible disk. Information is also provided on the "fly-height" of the rotating flexible disk relative to the fixed magnetic head.

In order to use interferometery to provide this information, the magnetic head is replaced by a transparent (glass) head which is precisely contoured to the shape of the magnetic head. However, instead of forming gaps in the transparent head 10, Fig. 1, to correspond to the gaps in the magnetic head, gaps 16 are scribed onto a highly polished metal plate 15, Fig. 1A, which is aligned with head 10 by dowel pins 20.

The transparent head 10 with plate 15 attached is illuminated with light from light source 25, Fig. 1. The light passes through beam splitter 30 with a portion impinging upon head 10 and with a portion directed into space as lost light. The impinging light is reflected by plate 15 back to beam splitter 30, which directs a portion of the reflected light onto television camera 35 focused at the interface of head 10 and plate 15. The simulated head gaps 16 appear on the screen of television receiver 40. Transparent tape is placed over the gaps 16 appearing on the television screen and marked, so that the gap locations are fixed in relationship to the scribed gaps 16 on the plate 15 as aligned with head 10.

Plate 15 is then removed and a magnetic flexible disk 50 is mou...