Optical recording medium having spiral tracks formed with a turning angle of more than 360.degree.
AssigneeSony Corporation
InventorKenichi Amano
Life of this patent
Estimating the term…
Abstract
An optical recording medium enables an optical pickup to quickly access a plurality of items of information progressing concurrently or to be selected simultaneously. By provision of spiral multitrack formed by multiple winding of a plurality of tracks in a first recording region and concentric-circle track formed in a second recording region adjacent to the first recording region, this invention can implement an optical recording medium in which the distance from the concentric-circle track to each track of the spiral multitrack is shortened, thus enabling an optical pickup to quickly access a desired track at a track jump.
Claims16
An optical recording medium comprising:
- a spiral multitrack formed by multiple windings of a plurality of tracks in a first recording region;
- and
- a spiral track formed with a turning angle of more than 360.degree. in a second recording region adjacent to said first recording region.
An optical recording medium comprising:
- a spiral multitrack formed by multiple winding of a plurality of tracks in a first recording region;
- and
- two concentrically circular tracks formed in a second recording region on one or both of the inner and the outer circumference sides enclosing said first recording region therebetween.
An optical recording medium comprising:
- a first spiral multitrack formed with a plurality of tracks multiply wound in either a clockwise direction or a counter clockwise direction from the central side to the peripheral side in a first recording region;
- and
- a second spiral multitrack formed with a plurality of tracks multiply wound in the same direction as the first spiral multitrack from the peripheral side to the central side in a second recording region;
- and
- a spiral track formed with a turning angle of more than 360.degree. in a third recording region interposed between said first recording region and said second recording region.
Dependencies are inferred from the claim text.