The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 25, 1980
Filed:
May. 15, 1978
Rolf Andresen, Broomfield, CO (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A record member is provided with a plurality of sector areas, including servo track follow integration areas. The integration areas comprise an equal number of signal bursts representing binary '1' and binary '0' in a predetermined arrangement to identify a plurality of record track location lines. The predetermined arrangement of '1's' and '0's' is generated by the insertion of one of two binary codes which exhibit high self-correlation properties, at positions within the integration areas corresponding to a consecutive number of signal bursts equal to a digit in the address identifying a particular one of the track location lines. The two binary codes are complements, are composed of an odd number of signal bursts and are selected so as to maintain equal the number of signal bursts representing binary '1' and binary '0', respectively, in the servo track follow integration areas. A transducer positioning circuit is provided which has a search mode for detecting addresses of the record track location lines and a servo mode for centering the transducer with respect to a selected one of the record track location lines.