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Researchers Submit Patent Application, "Optical Disc with Pre-Recorded and Recordable Regions and Method of Forming the Disc", for Approval

June 19, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors Town, John Matthew (Ojai, CA); Hamersley, Alan Bruce (Newbury Park, CA); Hofmann, Holger (Tuebingen, DE), filed on January 30, 2014, was made available online on June 5, 2014.

The patent's assignee is ; Thomson Licensing.

News editors obtained the following quote from the background information supplied by the inventors: "Pre-recorded optical media (e.g., optical discs) can be mass-replicated inexpensively and constitute an ideal distribution medium for many types of data, including, for example, compact disc (CD)-Audio, digital versatile disc (DVD)-Video, CD read-only memory (CD-ROM), Blu-ray discs (BD). Many optical disc applications can be enhanced or made more secure if the pre-recorded discs are made unique or serialized such that a typical readout device can identify the unique information. This is currently only possible with recordable media that has an added expense associated with recording, or on pre-recorded media via Burst Cutting Area (BCA) code writing for DVD, BD, and so on, where BCA has limited data capacity and limited application compatibility.

"A proposed alternative for improving disc security involves the use of radio-frequency identification (RFID) technology, in which an optical media with pre-recorded content is provided with an electro-optic layer, which allows the media to be disabled at a manufacturing facility, and subsequently enabled at a point of sale using RF activation. There is, however, still a need for additional techniques for disc activation in a manufacturing, a distribution or a retail setting,"

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "Embodiments of the present principles provide an optical disc having pm-recorded and recordable regions, various groove structures or configurations, as well as method of forming the disc, a stamper for forming a disc master, and a recording device for writing data to the recordable region.

"One embodiment provides an optical disc, which includes a first region with pre-recorded data including program content, and at least one recordable region. The program content is unreadable until additional data is written to the recordable region.

"Another embodiment provides an optical disc, which includes a recordable region having at least one groove with a plurality of gaps, in which the at least one groove is configured for use in recording data.

"Another embodiment provides an optical disc, which includes a recordable region having at least one grooveless region, in which the at least one grooveless region is configured for recording data.

"Another embodiment provides an optical disc, which includes a first region with pre-recorded data formed on a substrate, a second region including one or more recordable areas having at least one groove; and a recording layer formed only in the second region.

"Another embodiment provides a method of fabricating an optical disc, which includes:

"(a) forming a first region with pre-recorded data on a substrate, (b) forming a second region with at least one groove on the substrate, and © forming a recording layer only in the second region.

"Another embodiment provides a stamper for use in fabricating optical discs, which includes features for forming at least one groove and a plurality of pits on the disc, in which the features include at least one of: forming a groove having a plurality of gaps, and forming a blank section with a length greater than about 10 .mu.m and less than about 100 .mu.um between two pits.

"Another embodiment provides a recording device, which includes a processor configured for executing a program having instructions for performing a method, the method including retrieving information for identifying at least one recordable region of a disc by one of: accessing pre-recorded data on the disc, and accessing a database external to the disc; and directing a laser to write additional data to the at least one recordable region.

BRIEF DESCRIPTION OF THE DRAWINGS

"The teachings of the present invention can be readily understood by considering the following detailed description in conjunction with the accompanying drawings, in which:

"FIG. 1 illustrates a top view of an optical disc according to one embodiment of the present invention;

"FIG. 2 illustrates a cross-sectional view of the optical disc of FIG. 1;

"FIG. 3a illustrates a cross-sectional view of various material layers of an optical disc according to one embodiment of the present invention;

"FIG. 3b illustrates a cross-sectional view of various material layers of an optical disc according to another embodiment of the present invention;

"FIG. 3c illustrates a cross-sectional view of various material layers of an optical disc according to yet another embodiment of the present invention;

"FIG. 4 is a schematic illustration of a portion of a stamper that can be used for fabricating an optical disc of the present invention;

"FIGS. 5a-c are cross-sectional views of the fabrication of a glass master suitable for forming the stamper features of FIG. 4;

"FIG. 5d is a cross-sectional view showing an alternative groove arrangement;

"FIG. 5e is a top view of an optical disc having areas with different groove arrangements;

"FIG. 6a is a top view of one embodiment of a disc having discontinuous grooves according to one embodiment of the present invention;

"FIG. 6b is a perspective sectional view of two discontinuous grooves;

"FIG. 7a is a top view of a disc according to another embodiment; and

"FIG. 7b is a perspective sectional view of a blank section in a recordable area.

"To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures."

For additional information on this patent application, see: Town, John Matthew; Hamersley, Alan Bruce; Hofmann, Holger. Optical Disc with Pre-Recorded and Recordable Regions and Method of Forming the Disc. Filed January 30, 2014 and posted June 5, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=3497&p=70&f=G&l=50&d=PG01&S1=20140529.PD.&OS=PD/20140529&RS=PD/20140529

Keywords for this news article include: Patents.

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Source: Politics & Government Week


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