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. 18, 1983
Filed:
Aug. 22, 1979
Yoshimi Watanabe, Yokohama, JP;
Sony Corporation, Tokyo, JP;
Abstract
A tracking control system used in video reproducing apparatus to keep the signal head on the parallel recorded tracks in spite of speed deviations of the recording medium has a bi-morph leaf to support the head. The bi-morph leaf includes piezo-electric material to which a control voltage can be applied to deform the piezo-electric material to the extent necessary to deflect the leaf in the proper direction and to the proper extent necessary to keep the head mounted on the leaf alignment with the correct track section. When the leaf reaches its maximum permissible deflection, the control voltage is reversed to shift the head in the opposite direction. In so doing the head either skips a track section, if the recording medium is moving too fast, or repeats playback of a section, if the medium is moving too slowly. If the apparatus is reproducing magnetically recorded signals by means of two heads mounted on separate bi-morph leaves to play back alternate track sections, the control voltages can be applied to the leaves to shift each of the heads in the direction of its gap length during an interval when it is not being used to play back a track.