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US RE44,333 E1Granted
Optical device
AssigneeTian Holdings, LLC
InventorGin-Kon Wang
Life of this patent
Estimating the term…
Abstract
The present invention relates to an optical device which includes a first laser diode, a beam splitter, a first objective lens, a photo-detector, a second laser diode, a wedged plate beam splitter, a second objective lens and a collimator. The present invention deploys two independent transmitting paths. The retrieving paths share the beam splitter and the photo-detector commonly at the returning route.
Claims16
An optical device, which comprises:
- a first light source, providing a first polarized light needed when picking up signals;
- a first beam splitter, reflecting said first polarized light;
- a first objective lens, focusing said first polarized light reflected by said first beam splitter to a disc and completing a first emergent light path;
- a photo detector, detecting signals carried by said first polarized light, and passing through said first objective lens and said first beam splitter after being reflected by said disc, and further entering the photo detector, to complete the first light loop;
- a second light source, providing a second polarized light needed when picking up signals;
- a second beam splitter, reflecting said second polarized light;
- and
- a second objective lens, focusing said second polarized light reflected by said second beam splitter on said disc and completing said second emergent light path,
- wherein after being reflected by said disc, said second polarized light passes through said second objective lens, and is reflected by said second beam splitter and said first splitter, and therefore enters said photo detector to be detected with the signals carried, in order to complete the second light loop.
6 more elements
An optical device, which comprises:
- a first laser diode, providing a first polarized light needed when picking up signals;
- a first beam splitter, reflecting said first polarized light with a first side;
- a first objective lens, focusing said first polarized light reflected by said first beam splitter on a disc and completing a first emergent light path;
- a photo detector, detecting said signals carried by said first polarized light, passing through said first objective lens and said first beam splitter after being reflected by said disc, and further entering said photo detector, to complete the first light loop;
- a second laser diode, providing a second polarized light needed when picking up signals;
- a wedged plate beam splitter, passed through by said second polarized light emitted by said second light source behind said second beam splitter and reducing phase contrast;
- a collimator, calibrating the second polarized light, passed through said second beam splitter, to reduce phase contrast;
- and
- a second objective lens, focusing said second polarized light reflected by said second beam splitter on said disc in order to complete the second emergent light path,
- wherein after being reflected by said disc, said second polarized light passes through said second objective lens and said collimator, is reflected by said wedged plate beam splitter and said second side of said first splitter, and enters said photo detector to be detected said signals carried, in order to complete the second light loop.
7 more elements
An optical device, comprising:
- a first light source configured to provide a first light;
- a first beam splitter configured to direct the first light;
- a first lens configured to focus the directed first light to an optical storage medium to form a first light signal and to transmit the first light signal back to the first beam splitter;
- a photodetector configured to receive the first light signal from the first beam splitter;
- a second light source configured to provide a second light;
- a second beam splitter configured to reflect the second light;
- and
- a second lens configured to focus the reflected second light to another storage medium to form a second light signal and to transmit the second light signal back to the second beam splitter, wherein the second beam splitter subsequently reflects the second light signal to the first beam splitter, which subsequently reflects the second light signal to the photodetector.
5 more elements
A method for reading data, the method comprising:
- emitting a first light beam from a first light source;
- directing the first light beam to an optical storage medium using a first beam splitter to form a first light signal and reflecting the first light signal back to the first beam splitter;
- receiving the first light signal from the first beam splitter using a photo detector;
- emitting a second light beam from a second light source;
- directing the second light beam to another optical storage medium using a second beam splitter to form a second light signal and reflecting the second light signal back to the second beam splitter;
- reflecting the second light signal from the second beam splitter to the first beam splitter;
- reflecting the second light signal from the first beam splitter to the photo detector;
- and
- receiving the second light signal from the first beam splitter using the photo detector.
6 more elements
Dependencies are inferred from the claim text.