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:
Mar. 27, 1979
Filed:
Apr. 21, 1977
Applicant:
Inventors:
Theodore A Oliver, Ann Arbor, MI (US);
Neal E Foxworthy, Ann Arbor, MI (US);
Assignee:
Sycor, Inc., Ann Arbor, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ; G05B / ;
U.S. Cl.
CPC ...
360 72 ; 360 73 ; 318603 ;
Abstract
The specification discloses a method and apparatus for providing speed control and rotational indexing of a disc recorder, based upon a particular use of a plurality of electrical pulses produced, for example, as the slots of a slotted wheel, axially coupled to a recording disc, pass a transducer. The primary repetition rate of pulses in response to equally-spaced slots is used for speed control of the recording disc. A secondary pulse rate occurring between two successive pulses resulting from adjacent slots with different spacing is used to establish an index pulse correlated with a reference point on the disc.