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Track Following Servo for Magnetic Recording Using Luminescent Servo Tracks

IP.com Disclosure Number: IPCOM000091033D
Original Publication Date: 1969-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Kubec, RE: AUTHOR [+3]

Abstract

Magnetic disk 10 bears fluorescent or phosphorescent track-following servo tracks 11. The servo tracks are defined in the magnetic coating of the disk in several ways. For example, the fluorescent or phosphorescent material can be initially deposited as tracks on the disk substrate and then dissolved by the solvents in the magnetic coating to be diffused upwards to the top of the coating.

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Track Following Servo for Magnetic Recording Using Luminescent Servo Tracks

Magnetic disk 10 bears fluorescent or phosphorescent track-following servo tracks 11. The servo tracks are defined in the magnetic coating of the disk in several ways. For example, the fluorescent or phosphorescent material can be initially deposited as tracks on the disk substrate and then dissolved by the solvents in the magnetic coating to be diffused upwards to the top of the coating.

The material can also be deposited on the coating and carried in a solvent which diffuses the material into the coating without disturbing the surface smoothness. Optical windows in the magnetic coating allow other methods in which the servo tracks are not necessarily on the surface of the magnetic coating, but are in or below it.

The tracks are employed to guide the positioning of magnetic transducer 12 which is mounted on arm 13 from accessing motor 14. Light detector 15 is mounted on arm 13. If a phosphorescent material is used, excitation source 16, e.g., UV light, need not be mounted on arm 13. The light source provides light at a frequency to excite the material which fluoresces at a different frequency. Light detector 15 is arranged to respond to the different frequency. In this arrangement, detector 15, due to its close proximity to a servo track 11, needs no focussing system such as lenses to detect the precise location of the track when a phosphorescent material is used. Detector 15 if also pre...