Optical recording element
AssigneeU.S. Philips Corporation
InventorsPetrus J. Kivits, Martinus M. Sens, Rene Dufour
Life of this patent
Estimating the term…
Abstract
An optical recording element comprising an assembly of two parallel substrate plates made from a transparent synthetic resin and each comprising on their facing sides a recording layer which comprises a guide track in the form of a spiral-like groove, and a foil of sythetic resin which with both major surfaces engages or substantially engages the ridges of the recording layers present between the groove turns.
Claims3
An optical recording element comprising an assembly of two parallel substrate plates, each of said plates being made of a transparent synthetic resin and each of said plates comprising on their mutually opposing surfaces a guide track provided with a spiral-like groove and ridges between the turns of said groove, and a recording layer, situated upon and following the contours of said guide track and a slot-shaped gap present between said recording layers, characterized in that a foil of a synthetic resin is present in said gap, is sandwiched between said recording layers and engages essentially only the portions of the recording layers present on said ridges, said foil, when adhering to said recording layers, adheres only at the areas of said recording layers not in contact with said guide tracks and that said recording element is capable of recording information by radiation of said recording layers with modulated laser light through said substrate plates thereby to form in the resultant exposed areas of said recording layers light detectable changes.
Dependencies are inferred from the claim text.