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| Veiling glare control holographic windshield |
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Fabrication of sandwiched construction media
| Details |
Inventors: Edwards, Jathan D.; Aspen, Frank E.; Hegel, Ramon F.; Sandstrom, Chad R.;
Assignee: Imation Corp. (Oakdale, MN)
Primary Examiner: Assaf; Fayez G.
Assistant Examiner:
Attorney, Agent or Firm: Levinson; Eric D.
In one embodiment, holographic data storage medium includes a first thermoplastic substrate portion having a thickness less than approximately 2 millimeters and a second thermoplastic substrate portion having a thickness less than approximately 2 millimeters. A holographic recording material may be sandwiched between the first and second thermoplastic substrate portions. By making thermoplastic substrate portions sufficiently thin, edge wedge problems can be avoided. |
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DETAILED DESCRIPTION The invention is directed towards holographic data storage media, holographic data storage systems, and methods for making holographic data storage media.
The holographic data storage media may incorporate thermoplastic substrates having reduced substrate thicknesses.
Moreover, in some embodiments, holographic data storage media incorporate thermoplastic substrates within a particular thickness range.
In one embodiment, a holographic data storage medium may include a first thermoplastic substrate portion having a thickness less than or approximately equal to 2 millimeters, a second thermoplastic substrate portion having a thickness less than or approximately equal to 2 millimeters, and a holographic recording material sandwiched between the first and second thermoplastic substrate portions.
By way of example, the first and second thermoplastic substrate portions may be made of at least one of the following: polycarbonate, polymethylmethacrylate (PMMA), and amorphous polyolefin.
The holographic recording material may be made of a photopolymer.
The holographic data storage medium, for instance, may take the form of a disk or a card.
The first and second thermoplastic substrate portions may be injection molded substrate portions.
As will be described in detail below, an edge wedge phenomenon associated with injection molded thermoplastic substrates can make fabrication of holographic data storage media challenging.
To overcome problems introduced by the edge wedge phenomenon, the invention may involve the use of substrate portions with reduced thicknesses.
For instance, each of the first and second thermoplastic substrate portions may have thicknesses less than or equal to approximately 2 millimeters, less than or equal to approximately 1.
2 millimeters, or even less than or equal to approximately 0.
6 millimeters.
Optimal substrate thicknesses may have a lower limit determined by other variables such as birefringence and stiffness.
Therefore, in one particular embodiment, each of the first and second thermoplastic substrate portions have thicknesses less than 1
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Optical Systems 
