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US 8,077,584 B2Granted
Beam shifting element for an optical storage system
AssigneeThomson Licensing
InventorJoachim Knittel
Life of this patent
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Abstract
The present invention relates to a beam shifting element and to an apparatus for reading from and/or writing to optical storage media using in such a beam shifting element. According to the invention, the beam shifting element has at least a first optical element for deflecting an incoming light beam by a first angle and a second optical element for deflecting the light beam coming from the first optical element by a second angle opposite to the first angle, wherein the first optical element and the second optical element are optical elements with an adjustable deflection angle.
Claims7
A beam shifting element comprising:
- at least a first optical element for deflecting an incoming light beam by a first angle and
- a second optical element for deflecting the light beam coming from the first optical element by a second angle of the same absolute value as the first angle but of opposite sign,
- wherein the first optical element and the second optical element are transmissive gratings with an adjustable grating period.
Dependencies are inferred from the claim text.