Method and apparatus for positioning a light beam on a holographic media
First Claim
1. A positioning system for positioning a laser beam within a select storage region in a holographic storage media, comprising:
- a first motive device for holding the holographic storage media and moving the surface thereof along a single and linear direction in the plane of the surface of the holographic storage media;
a first reflective surface for reflecting the laser beam to provide a once redirected beam;
a second motive device for rotating said first reflective surface about an axis on the surface thereof, the laser beam impinging upon said axis; and
a collimating device for redirecting said once redirected beam toward the surface of the holographic storage media as a twice redirected beam such that all redirected positions of said twice redirected beam are substantially parallel to each other, the rotation of said first reflective surface causing said twice redirected beam to move along the surface of the holographic storage media in a path on the surface of the holographic storage media and at an angle to said single and linear direction through which said first motive device moves.
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Accused Products
Abstract
An apparatus for positioning a data and reference beam onto the surface of a holographic storage media (10) includes a laser (16) for generating the reference beam, and a first reflecting surface (18) for positioning the output of the laser (16) along the y-axis. The beam is split into a data beam and a reference beam by a beam splitter (24) with the data beam directed toward an SLM (36) and the reference beam (26) directed toward an angle multiplexing reflective surface (40). The data beam during a record operation is reflected from the surface of the SLM (36) to a transform lens (34) and then to a column (35) on the surface of a holographic storage media (10). The reference beam is reflected from a reflective surface (40) at a predetermined angle determined by the position of the reflective surface (40) to an HOE (46) for redirection to the surface of the storage media (10) to interfere with the data beam. During a data reconstruction operation, only the reference beam is generated. This results in a reconstructed image being directed toward an imaging lens (52) and then to a detector (54).
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Citations
12 Claims
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1. A positioning system for positioning a laser beam within a select storage region in a holographic storage media, comprising:
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a first motive device for holding the holographic storage media and moving the surface thereof along a single and linear direction in the plane of the surface of the holographic storage media; a first reflective surface for reflecting the laser beam to provide a once redirected beam; a second motive device for rotating said first reflective surface about an axis on the surface thereof, the laser beam impinging upon said axis; and a collimating device for redirecting said once redirected beam toward the surface of the holographic storage media as a twice redirected beam such that all redirected positions of said twice redirected beam are substantially parallel to each other, the rotation of said first reflective surface causing said twice redirected beam to move along the surface of the holographic storage media in a path on the surface of the holographic storage media and at an angle to said single and linear direction through which said first motive device moves. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A positioning system for positioning a laser beam within a select storage region in a holographic storage media, comprising:
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a first motive device for holding the holographic storage media and moving the surface thereof along a single and linear direction in the plane of the surface of the holographic storage media; a first reflective surface for reflecting the laser beam to provide a once redirected beam; a second motive device for rotating said first reflective surface about an axis on the surface thereof, the laser beam impinging upon said axis; a collimating device for redirecting said once redirected beam toward the surface of the holographic storage media as a reference beam such that all redirected positions of said reference beam are substantially parallel to each other, the rotation of said first reflective surface causing said reference beam to move along the surface of the holographic storage media in a path on the surface of the holographic storage media and at an angle to said single and linear direction through which said first motive device moves; a second reflective surface for reflecting said reference beam to provide a thrice redirected beam; a third motive device for rotating said second reflective surface about an axis along the surface thereof, the axis on the surface thereof oriented such that said thrice-redirected beam impinges thereon for all positions of said first reflective surface under the control of said first motive device; and a redirecting device for directing all angles of said thrice redirected beam from a given location along the axis on said second reflective surface to the select storage location in the holographic storage media as an angle multiplexed reference beam, said redirecting device comprising a cylindrical elliptical mirror having two foci, one disposed along the rotational surface on said second reflecting surface and the other disposed on the surface of the holographic storage media at said given location.
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Specification