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:
Apr. 17, 1984
Filed:
Sep. 28, 1981
George J Ammon, Medford, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
An apparatus is provided for randomly accessing data in a data retrieval system which utilizes a disc-shaped record medium. Information is stored in a plurality of tracks on the surface of the record medium. When the readout transducer is to be moved from its present read position (e.g., track #1,000) to a new read position (e.g., track #2,000), the difference in the number of tracks in the new position and the present position is loaded into a counter. As the transducer is moved across the disc surface the number of track crossings is counted and compared to the number loaded into counter. Even though the read head is moving outward, for example, eccentricities in the tracks will cause the head to 'see' both 'in' and 'out' crossings, the number of actual tracks crossed will be equal to the number of 'out' crossings minus the number of 'in' crossings. When the number of track crossings is equal to the number in the counter, the transducer will be enabled to follow the desired track.