G - Physics – 03 – C
Patent
G - Physics
03
C
352/32.1, 352/32
G03C 9/00 (2006.01) G01D 9/00 (2006.01) G03C 5/00 (2006.01)
Patent
CA 1259132
ABSTRACT OF THE DISCLOSURE An information recording medium includes a substrate having first and second sides. A layer of photoresist is deposited on the first side of the substrate. This layer of photoresist has a selected thickness and defines an area of openings therein such that the first side of the substrate is exposed at the openings, the openings being distributed in a pattern indicative of selected stored information. A reflecting layer is deposited on the photoresist layer and on the first side of the substrate at the openings. Both the substrate and the layer of photoresist are adapted to transmit the reading baam such that a portion of the reading beam incident on the second side of the substrate is reflected out of the substrate by the reflecting layer, both in a first region comprising the openings and in a second region between the openings. The selected thickness of the photoresist is chosen to provide destructive interference between the portions of the reading beam reflected out of the substrate by the reflecting layer in the first and second regions. Methods for forming such recording medium by photolithographic techniques are disclosed.
516477
Goff Michael W.
Hamersley Alan B.
Nomula Ramchandra R.
Thummalapally Vinai K.
Whitworth Thomas M.
Cassan Maclean
Discovision Associates
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