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INEXPENSIVE OPTICAL RECORDING MEDIA WITH HERMETIC SEAL AND HIGH SENSITIVITY

IP.com Disclosure Number: IPCOM000025074D
Original Publication Date: 1983-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 81K

Publishing Venue

Xerox Disclosure Journal

Abstract

Two problems exist with prior art optical disks: (a) oxidation of the media and (b) disk radial runout. Thin films of Si02 and A1203 deposited over tellurium (Te), the writing medium, will eliminate both problems.

This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately 66% of the total text.

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IEROX DISCLOSURE JOURNAL

INEXPENSIVE OPTICAL RECORDING Proposed Classification MEDIA WITH HERMETIC SEAL AND
HIGH SENSITIVITY
Roberta M. Fay
Richard D. Weir
Philip L. Chen

U.S. Cl. 365/126 Int. C1. Gllc 11/46

jDATA

SPIN COATED DISK

PMMA

MASKED EDGES Te- - - -

ADHESIVE

-- ----

GLASS

Te MASKED EDGES SPIN COATED

BACKER

PLATE

DATA DISK

Two problems exist with prior art optical disks: (a) oxidation of the media and (b) disk radial runout. Thin films of Si02 and A1203 deposited over tellurium (Te), the writing medium, will eliminate both problems.

The Te coated optical disk should be optimized in terms of (a) recording sensitivity,
(b) long term stability, (c) cost reduction. To improve recording sensitivity, a spin coated PMMA layer may be placed immediately below the Te. A 1/4 wavelength of Si02 is coated over the Te followed by a flash of a highly reflective metal such as Al, Ag or Cr.

28 1

Sloe

si02

PMMA

SiO2

Si02

Volume 8 Number 3 May/June 1983

[This page contains 1 picture or other non-text object]

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INEXPENSIVE OPTICAL RECORDING MEDIA WITH HERMETIC SEAL AND HIGH SENSITIVITY (Cont'd)

To enhance long term stability, both an undercoat and overcoat of SiO, can be used. If the disk edges are masked during the Te deposition, then the disk edges will not have any Te and the subsequent Si02 overcoating will seal the sides as well as the top of the Te thin film.

To minimize cost, plastic substrates can be used instead of glass unless the chemically strengthened...