Method and apparatus for generating focus error signals in a multi-beam optical disk drive
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 8, 2001
Grant Date -
N/A
app pub date -
Oct 9, 1998
filing date -
Oct 9, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A focus detection system for use in a multi-beam optical pickup assembly is provided that uses an optical element, either a holographic element or diffractive element, to split beams reflected off of a data-bearing surface of an optical disk into a plurality of data beams and a plurality of focus beams. The optical element also introduces astigmatism into the focus beams. The focus beams are projected onto focus detectors configured to account for overlap between adjacent focus beams to produce an accurate focus error signal.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully