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US 6,552,985 B1Granted
Method of recording a multi-layer optically recordable information carrier
AssigneeKoninklijke Philips Electronics N.V.
InventorHarm A. Wierenga
Life of this patent
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Abstract
A circuit derives information about the changes of the transmission coefficients of the layers due to writing information onto these layers. On the basis of the derived information a circuit determines the sequence in which the layers are to be recorded so as to minimize the required intensity of the laser beam, thereby precluding unnecessary heating of the carrier and allowing comparatively simple and cheap laser beam sources to be used.
Claims16
A method comprising
- first recording information on a first optically recordable layer on an information carrier by exposure to laser light from a first side of the carrier,
- second recording different information on a different second optically recordable layer overlapping the first layer on the carrier, by exposure to the laser light from the first side;
- first determining the changes of the effective transmission properties of the optically recordable layers, before the recording of information on the layers, with respect to the effective transmission properties of the optically recordable layers due to recording of information on the layers;
- second determining the sequence of recording of the first and the second optically recordable layers, said sequence based on the changes of the effective transmission properties of the optically recordable layers.
1 more element
A recording apparatus comprising
- means for recording information on a first optically recordable layer by exposure to laser light from a first side of an information carrier, and to record information on a different second optically recordable layer overlapping the first layer on the carrier, by exposure to laser light from the first side,
- first means for determining the changes of the effective transmission properties of the optically recordable layers, before the recording of information on the layers, with respect to the effective transmission properties of the optically recordable layers due to the recording of information on the layers;
- and
- second means for determining the sequence of recording of the first and the second optically recordable layers, said sequence based on the changes of the effective transmission properties of the optically recordable layers.
1 more element
Apparatus for programming a recording apparatus comprising:
- apparatus to provide means for recording information on a first optically recordable layer by exposure to laser light from a first side of an information carrier, and to record information on a different second optically recordable layer overlapping the first layer on the carrier, by exposure to laser light from the first side;
- apparatus to provide first means for determining the changes of the effective transmission properties of the optically recordable layers, before the recording of information on the layers, with respect to the effective transmission properties of the optically recordable layers due to the recording of information on the layers;
- and
- apparatus to provide second means for determining the sequence of recording of the first and the second optically recordable layers, said sequence based on the changes of the effective transmission properties of the optically recordable layers.
1 more element
Dependencies are inferred from the claim text.