Diffraction element and optical pickup device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 10, 2004
Grant Date -
May 23, 2002
app pub date -
Oct 5, 2001
filing date -
Oct 6, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a diffraction element, a diffraction grating is formed with a grating pitch having different diffraction angles in accordance with a wavelength of a laser light beam incident thereon. The wavelength is variable in accordance with an environment temperature. The diffraction element is made of a material having a linear expansion coefficient which causes thermal variation in the grating pitch enough to compensate at least a part of the diffraction angle variation due to environment temperature change.
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