Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1987-10-15
1989-06-27
Faber, Alan
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
350 372, 35016216, 350413, 350432, 369 14, 369 44, 369112, G11B 1300
Patent
active
048434949
ABSTRACT:
A magnetic data storage system for use with a double sided disk in which a prerecorded pattern of opaque optical lines is used to define the tracks in which magnetic data is to be stored. A separate optical system including an illumination source and a photosensitive detector is provided on a read/write assembly for each side of the disk. Each detector is designed also to serve as a reference grating. The illumination source is designed to image the prerecorded pattern of optical lines on the reference grating as an indication of the alignment of the read/write head of the assembly and a desired data rack and any misalignment of the head and track generates a servo signal. The detector uses four separate photocells interleaved in a prescribed fashion to form a quadrature detector that is adjustable to compensate for various non-uniformities. One form of illumination source uses a surface-emitting light emitting diode and optics for forming a multiple beam source.
REFERENCES:
patent: 2092892 (1935-12-01), Runge
patent: 3833769 (1974-09-01), Compaan et al.
patent: 4570191 (1986-02-01), Di Stefano et al.
patent: 4633451 (1986-12-01), Ahn et al.
patent: 4733065 (1988-03-01), Hoshi et al.
IBM Technical Disclosure Bulletin, vol. 26, No. 6, Nov. 1983, pp. 2951-2952, Holographically Generated High Resolution Track Servo Pattern for Optical or Capacitive Readout, Werlich et al.
IBM Technical Disclosure Bulletin, vol. 20, No. 10, Mar. 1978, pp. 4108-4109, Optical Servo of Magnetic Recording, Hoagland.
C. Goudal, Abstract of French Application FR2315142, filed Jul. 17, 1975, published Jan. 14, 1977, Derwent Publications Ltd.
IBM Technical Disclosure Bulletin, vol. 27, No. 7A, Dec. 1984, pp. 3994-3995, Optical Recording of Servo Pattern on Magnetic Disks, Aviram et al.
IBM Technical Disclosure Bulletin, vol. 25, No. 12, May 1983, pp. 6432-6433, Monolithic Optical Track Scanner for Magnetic Recording System, Scranton.
IBM Technical Disclosure Bulletin, vol. 27, No. 8, Jan. 1985, pp. 4877-4878, Servowriter Reference Clocks from Shaft Encoder Farran et al.
IBM Technical Disclosure Bulletin, vol. 23, No. 7B, Dec. 1980, p. 3319, Optical Storage of Data on a Magnetic Medium, Laming et al.
IEEE Transactions on Magnetics, vol. Mag 16, No. 5, Sep. 1980, pp. 631-633, Optical Method of the Head Positioning in Magnetic Disk Systems, Koshino et al.
IBM Technical Disclosure Bulletin, vol. 16, No. 9, Feb. 1974, p. 3020, Optical Servo Technique Using More Fringes, Hart.
Clark Peter P.
Cocco Vincent L.
Cronin David V.
Guerra John M.
Mokry Patricia A.
Faber Alan
Garland Steven R.
Polaroid Corporation
Vale John S.
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