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Double facing double storage capacityDouble facing double storage capacity description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060193023, Double facing double storage capacity. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATION [0001] This application is a divisional of U.S. application Ser. No. 10/511,624, filed Oct. 18, 2004. FIELD OF THE INVENTION [0002] The present invention generally relates to photonics data memory devices. In particular, the present invention relates to a double-faced diffractive holographic data storage device. BACKGROUND OF THE INVENTION [0003] There is a strong interest in high-capacity data storage systems with fast data access due to an ever-increasing demand for data storage. Limitations in the storage density of conventional magnetic memory devices have led to considerable research in the field of optical memories. Holographic memories have been proposed to supersede the optical disc (CD-ROMs and DVDs) as a high-capacity digital storage medium. The high density and speed of holographic memory results from the use of three-dimensional recording and from the ability to simultaneously read out an entire page of data. The principal advantages of holographic memory are a higher information density, a short random-access time, and a high information transmission rate. [0004] While holographic data storage systems have not yet replaced current CD and DVD systems, many advances continue to be made which further increase the potential of storage capacity of holographic memories. This includes the use of various multiplexing techniques such as angle, wavelength, phase-code, fractal, peristrophic, and shift. However, previous methods for recording information in highly multiplexed volume holographic elements, and for reading them out, have not proved satisfactory in terms of throughput, crosstalk, and storage capacity. [0005] It has also been proposed to use double-sided holographic data storage device. However, issues such as crosstalk between layers, speed of data access and speed of access to the double diffractive holographic layers continue to challenge technological advances in this area. [0006] Thus, it would be desirable to provide a diffractive holographic data storage device, which increases storage capacity by utilizing double layers of the data storage device. Also, it would be desirable to provide techniques for providing fast access to double sides and layers of a diffractive holographic data storage device. Furthermore, it will be desirable to provide a diffractive holographic data storage device, that is compatible with the traditional HYDIF multiplexing technology. The compatibility is coming from the smart association of two diffractive sides recorded with HYDIF process but allowing by an improvement a simultaneous simple reading of both faces. This association doubles the storage capacity and increase global reading speed of stored data access. SUMMARY OF THE INVENTION [0007] According to one aspect of the invention, a double-sided diffractive holographic data storage device includes a first diffractive holographic data storage device having a first set of holograms stored thereon and a second diffractive holographic data storage device having a second set of holograms stored thereon. The first reflective hologram is formed by the diffracted part of the reference beam processed by the first side of the double-side diffractive holographic data storage device. The storage device may be coated with polypeptide material. As an example, an opaque layer is disposed between and attached to one side of the first and second diffractive holographic data storage devices. In accordance with another aspect of the invention, an apparatus and method for reading a double-sided diffractive holographic data storage device having first and second reflective holograms stored on first and second sides respectively is provided. The apparatus includes a light source for generating a reference beam, a multi-scanning device for directing the reference beam incident on the first side of the double-sided diffractive holographic data storage device at a predetermined angle, wherein a first reflective hologram is formed by the reference beam reflected from the first side of the double-sided diffractive holographic data storage device. A detecting device is provided for detecting the reference beam reflected from the double-sided diffractive holographic data storage device. A rotating unit rotates the double-sided diffractive holographic data storage device into one of two positions, wherein when the rotating unit is in a first position, the reference beam is incident upon the first side of the double-sided diffractive holographic data storage device and the detecting device detects the first output data packet (i.e., diffractive holographic image) reflected from the first side of the diffractive holographic data storage device, and when the rotating unit is in a second position, the reference beam is incident upon a second side of a double-sided diffractive holographic data storage device, and its detecting device detects the second output data packet (i.e., diffractive holographic image) reflected from the second side of the diffractive holographic data storage device. [0008] According to another aspect of the invention, an apparatus and method of reading a double-sided diffractive holographic data storage device having a reflective and a transmissive set of diffractive patterns storing data packets on first and second sides is provided. [0009] Further objects, advantages, and novel features of the present invention will become apparent to those skilled in the art from this disclosure, including the following detailed description, as well as by practice of the invention. While the invention is described below with reference to a preferred embodiment(s), it should be understood that the invention is not limited thereto. Those of ordinary skill in the art having access to the teachings herein will recognize additional implementations, modifications, and embodiments, as well as other fields of use, which are within the scope of the invention as disclosed and claimed herein and with respect to which the invention could be of significant utility. BRIEF DESCRIPTION OF THE DRAWINGS [0010] In order to facilitate a fuller understanding of the present invention, reference is now made to the appended drawings. These drawings should not be construed as limiting the present invention, but are intended to be exemplary only. [0011] FIGS. 1A-1D are graphs illustrating recording and reading processes of transmissive and reflective holography in accordance with one embodiment of the present invention. [0012] FIG. 2 is a schematic representation of an apparatus for recording data in the form of a reflective hologram in accordance with one embodiment of the present invention. [0013] FIG. 3 is a graph showing the effect of recording angle on angular selectivity in accordance with one embodiment of the present invention. [0014] FIG. 4 is a schematic representation of a double-faced diffractive holographic data storage device in accordance with one embodiment of the invention. [0015] FIG. 5 is a schematic representation of an apparatus for reading information stored on the double-faced diffractive holographic data storage device shown in FIG. 4 in accordance with one embodiment of the invention. [0016] FIG. 6 is a schematic representation of an apparatus for reading information stored on the double-faced diffractive holographic data storage device shown in FIG. 4 in accordance with another embodiment of the invention. [0017] FIG. 7 is a schematic representation of an apparatus for reading information stored on the double-faced diffractive holographic data storage device shown on FIG. 4 in accordance with yet another embodiment of the invention. [0018] FIG. 8 is a schematic representation of an apparatus for reading information stored on the double-faced diffractive holographic data storage device incorporating both reflective and transmissive holograms in accordance with one embodiment of the invention. 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