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:
Oct. 01, 1985
Filed:
Nov. 21, 1983
Richard C Painton, Webster, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
During a first phase of operation for a disc player incorporating the invention, a derived playback signal which is 'above' a signal level of a threshold effects head motion in a given direction. During a second phase of disc player operation, the derived playback signal is again compared with the threshold, only this time a signal that is 'below' the threshold effects head motion in the 'same' given direction. During a third phase of operation, the derived signal, when at or above the threshold, initiates an incremental drive for the head. Such a drive steps the head in the given direction so long as the lowest playback signal level, during each given disc rotation, continues to increase. Thus, during this third phase of disc player operation, the head settles to a track location which is 'invariantly' maximized. This means, therefore, that track eccentricity has absolutely no influence during playback of the track.