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US 5,477,524 AGranted
Optical memory medium with preformed pit arrangement
AssigneeSharp Kabushiki Kaisha
InventorsToshihisa Deguchi, Kenji Ohta, Akira Takahashi
Life of this patent
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AssigneeSharp Kabushiki Kaisha
InventorsToshihisa Deguchi, Kenji Ohta, Akira Takahashi
Estimating the term…
In an optical memory medium comprising prepits on which a light spot is impinged to obtain information and, if required, guide grooves: each of those among the prepits which are longer than the diameter of the light spot consists of a series of pit portions and unpitted portions; each of the prepits is sandwiched between two of the discontinuous portions of guide grooves adjacent to each other; the guide grooves have one or more narrow portions, and each of the prepits is sandwiched between two of the narrow portions of guide grooves adjacent to each other; or the guide grooves have one or more long portions, one or more short portions, and narrow portions formed between the long and short portions, and each of the prepits is sandwiched between two of the short portions of guide grooves adjacent to each other.
A substrate for an optical memory medium having a plurality of prepits formed thereon and from which stored information is read out in binary signal form by being scanned with a laser beam, the respective prepits corresponding to one of two signal levels of the binary signal form, the substrate comprising:
A substrate for an optical memory medium having a plurality of prepits formed thereon, the substrate comprising:
A substrate for an optical memory medium having a plurality of prepits formed thereon and from which stored information is read out in signal form by being scanned with a laser beam, the respective prepits corresponding to one of two signal levels of the signal form, the substrate comprising:
Dependencies are inferred from the claim text.