Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1977-04-08
1978-10-31
Wolff, John H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360131, 1791003B, 1791003V, G11B 708
Patent
active
041237889
ABSTRACT:
A system for the position control of a write-read head for information carriers with a magnetic storage layer, having optical servo tracks. The servo tracks consist of periodically interrupted lines, whose period length is constant and whose phase relationship differs for adjacent servo tracks. An optical scanner is connected to the magnetic write-read head and is provided with a diaphragm which transmits at the most one line section and at least one overlap between two adjacent line sections to the scanner.
REFERENCES:
patent: 3365706 (1968-01-01), King
patent: 3438050 (1969-04-01), Aschenbrenner et al.
patent: 3673412 (1972-06-01), Olson
patent: 4038679 (1977-07-01), Bouwhuis et al.
IBM Technical Disclosure Bulletin, vol. 16, No. 11, pp. 3757-3759, Apr. 1974.
IBM Technical Disclosure Belletin, vol. 16, No. 4 Sep. 1973, p. 108, "Optical Servo Information on magnetic recording discs" by J. Schneider.
Cohen Simon L.
Trifari Frank R.
U.S. Philips Corporation
Wolff John H.
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