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. 26, 2016
Filed:
Nov. 21, 2012
Applicant:
Oracle International Corporation, Redwood City, CA (US);
Inventor:
Scott D. Wilson, Thronton, CO (US);
Assignee:
Oracle International Corporation, Redwood City, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 7/1353 (2012.01); G11B 7/1374 (2012.01); G11B 7/1395 (2012.01); G11B 7/1392 (2012.01); G11B 7/003 (2006.01); G11B 7/0045 (2006.01);
U.S. Cl.
CPC ...
G11B 7/1395 (2013.01); G11B 7/1353 (2013.01); G11B 7/13922 (2013.01); G11B 7/003 (2013.01); G11B 7/00458 (2013.01); G11B 7/1374 (2013.01);
Abstract
An optical tape pick up unit includes a holographic optical element and an aspheric objective lens. The holographic optical element splits a laser beam into first order beams and introduces pre-compensating wavefront error into the first order beams. The aspheric objective lens focuses the first order beams onto optical tape and introduces wavefront error into the first order beams having a magnitude similar to and polarity opposite that of the pre-compensating wavefront error.