Multilayer information disc

Details Multilayer information disc Multilayer information disc

G - Physics

11

B

352/32.4

G11B 7/24 (2006.01) B29D 17/00 (2006.01) G11B 7/26 (2006.01)

Patent

CA 1149060

26.10.1978 1 PHN.9076 ABSTRACT: The invention relates to a multilayer inform- ation disc, in particular a video disc, which is read by means of laser light. The disc comprises at least two ra- diation-reflecting optical structures each having a relief- like information track of regions situated alternately at a higher and a lower level which is read in reflection and on the basis of occurring phase differences. The optical struc- tures are covered with a reflection layer. According to the invention at least one optical structure is covered with a reflection layer which partially transmits the reading radiation. Upon reading the other optical structure or structures the reading radiation passes through the struc- ture provided with a partially transmitting reflection layer. In a favourable embodiment the disc comprises a transparent substrate plate which is provided on one side and which upon reading the disc is irradiated by the read- ing beam. The coefficients of reflection of the various optical structures are preferably matched to each other in such manner that upon reading the same amount of light, re- turns from each optical structure. A suitable partial re- flection layer is a dielectric layer which shows no light absorption.

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