Browse Prior Art Database

Track Following Servosystem

IP.com Disclosure Number: IPCOM000090264D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Padalino, M: AUTHOR [+2]

Abstract

A servo track array and a method of establishing the servo tracks on a magnetic recording medium are shown. Servo information 10 is previously recorded at relatively long wavelengths to completely saturate magnetic recording medium 11. Data 12 is then recorded at short wavelengths so as to be confined to the top portion of medium 11 and leave the major portion of information 10 undisturbed. Slider 13 includes narrow-gap data head 14 for recording and reading the high data frequencies and wide-gap servo head 15 for reading the low servo track frequencies. The data head is coupled to file control unit 16 by read-write circuits 17. Each previously recorded servo track comprises a continuously recorded track of one of three servo frequencies f0, f1, or f2.

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 57% of the total text.

Page 1 of 2

Track Following Servosystem

A servo track array and a method of establishing the servo tracks on a magnetic recording medium are shown. Servo information 10 is previously recorded at relatively long wavelengths to completely saturate magnetic recording medium 11. Data 12 is then recorded at short wavelengths so as to be confined to the top portion of medium 11 and leave the major portion of information 10 undisturbed. Slider 13 includes narrow-gap data head 14 for recording and reading the high data frequencies and wide-gap servo head 15 for reading the low servo track frequencies. The data head is coupled to file control unit 16 by read-write circuits 17. Each previously recorded servo track comprises a continuously recorded track of one of three servo frequencies f0, f1, or f2. The adjacent tracks comprise a continuing sequence of the three frequencies, thus allowing straightforward summation detection to provide both amplitude and polarity track-following servo information.

The signals detected by head 15 are amplified and integrated by amplifier 18. Filters 19...21 separate the detected signals into the three frequencies to provide a voltage V0, V1 or V2 representing the average amplitude of each frequency detected. The outputs of filters 19...21 are supplied to pulse shapers 22. During coarse positioning of slider 13 at a selected track, several servo tracks are crossed. As a junction between two tracks is crossed, one frequency drops sharply in amplitude an...