US PATENT SUBCLASS 369 / 275.1
.~ Optical track structure (e.g., phase or diffracting structure, etc.)

Current as of: June, 1999
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369 /   HD   DYNAMIC INFORMATION STORAGE OR RETRIEVAL

272  DF  STORAGE MEDIUM STRUCTURE {11}
275.1.~ Optical track structure (e.g., phase or diffracting structure, etc.) {4}
275.2  DF  .~.~> Erasable, reversible or re-recordable
275.3  DF  .~.~> Track data format/layout
275.4  DF  .~.~> Pit/bubble/groove structure specifies
275.5  DF  .~.~> Protection (e.g., preventing damage to medium, etc.)

DEFINITION

Classification: 369/275.1

Optical track structure (e.g., phase or diffracting structure, etc.):

(under subclass 272) Subject matter wherein an information track is in the form of a variation of light modifying structure on the storage medium element.

(1) Note. The term "light modifying structure" refers to modification such as bending, diffraction, phase variation, but does not include simple changes in transmissivity or reflectivity.

SEE OR SEARCH THIS CLASS, SUBCLASS:

44.11+, 93+ and 100+, for devices and systems utilizing such storage medium elements.

284+, for a layered storage medium having information modulation of transmissivity or reflectivity.

SEE OR SEARCH CLASS

235, Registers,

454, for optically coded record sensors; subclass 487 for optical records, per se. 359, Optics: Systems (Including Communication) and Elements, appropriate subclasses for light modifying structure, in general.