Optical recording device having several ablative recording layers
AssigneeU.S. Philips Corporation
InventorsBernardus A. J. Jacobs, Adriaan W. De Poorter, Pieter Zalm
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Abstract
The invention relates to an optical recording device having a substrate plate which is provided on at least one side with a first ablative recording layer and a second ablative recording layer provided hereon, the second ablative recording layer having a higher surface energy than the second ablative recording layer. Both recording layers preferably comprise the same common metal, for example tellurium.
Claims11
A device for the optical recording of information comprising a substrate plate having on at least one side an ablative recording layer which locally melts and forms holes as a result of exposure to laser light modulated in accordance with the information to be written, characterized in that on its surface remote from the substrate the ablative recording layer has a second ablative recording layer having a higher surface energy than the first recording layer, in which during operation of the device both recording layers melt and form liquid regions in the places exposed to the laser light and furthermore as a result of mixing of the recording layers in the liquid regions, a leap in the surface energy occurs at the circumferential edge thereof so that the molten recording material is drawn to the circumferential edge, wets the solid surface of the second recording layer and a hole is formed.
Dependencies are inferred from the claim text.