Optical servo for magnetic disks

Details Optical servo for magnetic disks Optical servo for magnetic disks

1985-01-02

1986-12-30

McElheny, Jr., Donald

Dynamic information storage or retrieval

Simultaneous diverse types of storage or retrieval

360 77, 360135, 369 44, 369275, G11B 1304, G11B 1110, G11B 558, G11B 708

Patent

active

046334513

ABSTRACT:
The surface of a magnetic recording disk is encoded with optically sensed indicia, which is employed to control track following of the read/write slider head along a track on a magnetic recording medium such as a disk. The means of reading the medium is to employ a laser carried by the slider which cooperates with the medium as a reflector which affects the lasing function or modulates the operating characteristics of the laser diode. The retro-reflected light changes the operating voltage of the diode. Preferably, the disk is coated with a multiple layer optical recording medium deposited upon the upper surface of the magnetic recording medium.

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IBM TDB, vol. 16, No. 4 "Optical Servo Information on Magnetic Recording Medium" Schneider, Sep. 1973, p. 1082.
IBM TDB, vol. 21, No. 10, "Floppy Disc Embossing for Servo Applications" Acosta et al., Mar. 1979, pp. 4259-4260.
IBM TDB, vol. 19, No. 9 "Optical or Capacitive Digital Servos for Record Members" Cannon, 2/77, pp. 3303-3304.
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IEEE Trans. on Magnetics, vol. Mag-16, No. 5 "Optical Method of Head Positioning in Magnetic Disk Systems" Koshino et al. 9/80, pp. 631-633.
"Laser Interferometry Technique for Track-Following Servo control of DASD Head Location"-M. D. Levenson Aug. 1982, pp. 1103-1107 IBM TDB, vol. 25, No. 3A.
"Floppy Disc Embossing for Servo Applications"--R. E. Acosta et al., Mar. 1979, pp. 4259-4260 IBM TDB, vol. 21, No. 10.
"Optical Servo of Magnetic Recording--A. S. Hoagland Mar. '78, pp. 4108-4109, IBM TDB, vol. 20, No. 10.
"Optical Servo Information on Magnetic Recording Disks"--J. Schneider Sep. 1973, p. 1082.

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