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. 17, 1984
Filed:
Feb. 06, 1981
Atsumi Hirata, Fujisawa, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
Abstract
A rotary recording medium has at least one surface on which a spiral main track is formed with a reference signal track disposed centrally between mutually adjacent track turns. The track turns of the main track have an information signal recorded thereon. First and second reference signals are recorded alternately on the reference signal track, and a third reference signal is recorded at changeover positions on the recording medium. The three reference signals control a pickup guiding servo system. To identify specific places on the recorded disc, the third reference signal is recorded during extra long periods, with identification being made on a basis of the lengths of those long periods.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile