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:
Jun. 09, 1992
Filed:
Jun. 18, 1990
Applicant:
Inventors:
Stephen W Farnsworth, Berthoud, CO (US);
Scott D Wilson, Westminster, CO (US);
Assignee:
Bernoulli Optical Systems Company, Boulder, CO (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G01J / ; G02B / ;
U.S. Cl.
CPC ...
369 4426 ; 369103 ; 369109 ; 369118 ; 2502015 ; 356356 ; 359 15 ; 359560 ;
Abstract
Coherent light passing through slits produces an optical interference pattern having a fringe spacing related to the spacing of the servo tracks on a magnetic disk. The convolution of the interference pattern with the servo tracks generates a quadrature servo error signal.