Optical recording carrier having groove wobble phase changes between subsequent predetermined positions
AssigneeKoninklijke Philips Electronics N.V.
InventorsJohannes Hendrikus Maria Spruit, Johannes Josephus Leonardus Maria Van Vlerken
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Abstract
An optical record carrier (1) is provided with tracks having a groove (4) wobbled in a radial direction and predetermined positions (18) along the track. Embossed pits (18) at the predetermined positions represent addressing information. The phase of the wobble near the predetermined positions depends on whether a pit is present (18) on a predetermined position or not (19). The wobble changes phase between each two subsequent predetermined positions of which one on the positions contains no pit and the other position contains a pit.
Claims11
An optical record carrier comprising a recording layer having substantially parallel tracks for recording information in a pattern of optically detectable marks, the tracks being provided with wobbled grooves and predetermined positions at regular intervals along the tracks, part of the predetermined positions forming information positions on which information is stored in the form of pits, and the phase of the wobble at the information positions depends on the presence of a pit at such a predetermined position, and the wobble changes phase between each two subsequent predetermined positions of which one of the positions contains no pit and the other position is an information position containing a pit.
Dependencies are inferred from the claim text.