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:
Jan. 08, 1985
Filed:
Jun. 24, 1982
John O Rooney, Stenton, Glenrothes, Fife, GB;
Ian B Freeman, Union City, CA (US);
Other;
Abstract
In a disc data store for the storage of retrievable informational data in a plurality of concentric circular data storage tracks on a rotary medium accessed by a positioner operable to respond to a track command signal to place a data recording or recovering transducer into adjacence with a selected track where a disc rotator is operable to maintain the surface velocity of the medium beneath the transducer substantially constant regardlessly of the radius of the transducer on the medium for the purpose of maximizing the data storage capacity of the medium, the sluggishness of response of the angular velocity of the medium found in those systems where a position transducer senses the position of the recording or recovering transducer to provide an output for controlling the angular velocity of the medium is overcome by providing that the medium is rotated by an angular velocity control servomechanism operable to respond to the same track command signal as received by the positioner to so maintain the surface velocity of the medium relative to the recording or recovering transducer and capable of stabilizing the angular velocity in advance of the recording or recovering transducer arriving at a target track.