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, 2002
Filed:
Jun. 11, 1999
Applicant:
Inventors:
Ronald E. Gerber, S. Richfield, MN (US);
Edward C. Gage, Apple Valley, MN (US);
Assignee:
Seagate Technology, LLC., Scotts Valley, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/00 ;
U.S. Cl.
CPC ...
G11B 7/00 ;
Abstract
A focus and tracking error system in which a light source such as a laser diode, a beam splitter, a collimating lens, a focussing lens, a 3-beam splitter, a beam diverter, and an optical detector pass a beam to a data media track, with the beam reflecting from the track into a 3-beam splitter, such as a Wollaston prism, through a beam diverter, such as a bi-wedge into an optical detector to form a pair of differential signals for the focussing error, and positioning, reflectivity data signals, and magneto-optical signals.