Disc reproducing system

Details Disc reproducing system Disc reproducing system

1980-09-11

1983-12-13

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

369276, 369126, 369111, 360 77, H04N 583, G11B 1100, G11B 2110

Patent

active

044208278

ABSTRACT:
An information signal recording medium of rotary type has a flat surface with first succession of pits formed therein as respective concavities in response to a first signal and with second succession of pits formed therein as respective concavities in response to a second signal. The second succession of pits are formed at positions substantially intermediate between the centerlines of adjacent tracks formed by the first succession of pits. Each pit of the first succession of pits and each pit of the second succession of pits respectively have widths W1 and W2 and depths D1 and D2, wherein the relationships between the widths and said depths are so selected that the levels L1 and L2 of the first and second signals which are reproduced when the first and second succession of pits are traced and thereby reproduced by reproducing means will be such that the level L1 is greater than the level L2, and the difference between the levels L1 and L2 will be greater than a specific level difference.

REFERENCES:
patent: 3438050 (1969-04-01), Aschenbrenner
patent: 3673412 (1972-06-01), Olson
patent: 3701846 (1972-10-01), Zenzefilis
patent: 3787887 (1974-01-01), Burton
patent: 3800099 (1974-03-01), Dickopp
patent: 3894179 (1975-07-01), Jacobs
patent: 3919697 (1975-11-01), Walker
patent: 3968326 (1976-07-01), Nosker
patent: 4001493 (1977-01-01), Cone
patent: 4006292 (1977-02-01), Schaefer
patent: 4051329 (1977-09-01), Blondet
patent: 4084185 (1978-04-01), Long
patent: 4161752 (1979-07-01), Basilico
patent: 4199782 (1980-04-01), Wada
patent: 4321621 (1982-03-01), Kinjo
patent: 4327430 (1982-04-01), Wada et al.
Servo Disk with Overlapping Servo and Data Tracks", by Constick et al., p. 1818, IBM Tech. Disc., vol. 16, No. 6, Nov. 1973.
"Self Calibrating Disc Storage Apparatus", by Griffiths, IBM Tech. Disc. Bul., vol. 19, No. 6, Nov. 1976, pp. 1991, 1992.

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