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EP0263641A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for making an erasable optical data storage medium

Assignee: Koninklijke Philips NV
•
Filing: 1987-09-30
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Granted: —
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Expires: 2007-09-30
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Abstract

Abstract An erasable optical data storage medium has an integral recording layer (11) including an expansion zone (18) and a retention zone (16) having different optical and thermal-mechanical properties. A uniform integral layer of dyed polymer material (14) has the dye leached out of the surface region and a second dye diffused into the surface region to create a retention zone (16). The retention zone (16) has a higher elastic modulus and glass transition temperature than the underlying expansion zone (18) and is adapted to absorb and transmit light which is centered about a different wavelength than the expansion zone (18). The medium is adapted to be used with a non-ablative and non-vesicular method to create and erase optically detectable deformations (24) in the retention zone.

Inventors

  • 👤 Michael A. Lind
  • 👤 W.Eugene Skiens
  • 👤 Clyde D. Feyrer
  • 👤 John W. Swanson

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 01:15
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11B; G11B7/00; G11B7/24; Y; Y10; Y10S; Y10S430/00; Y10S430/146

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 40 words
An optical data storage medium comprising: (a) a data recording layer of a single integral material; and characterized by (b) said data recording layer having a first zone and a second zone, said zones treated to yield different optical properties.
Claim 2
Dependent Claim 40 words
An optical data storage medium comprising: (a) a data recording layer of a single integral material; and characterized by (b) said data recording layer having a first zone and a second zone, said zones treated to yield different optical properties.
Claim 3
Dependent Claim 17 words
The medium of claim 1, further characterized by said first and second zones having different thermal-mechanical properties.
Claim 4
Dependent Claim 21 words
The medium of claim 2, further characterized by the interface between said first and second zones being diffuse rather than discrete.
Claim 5
Dependent Claim 26 words
The medium of claim 1, further characterized by said material within said second zone having a different molecular structure than said material within said first zone.
Claim 6
Dependent Claim 27 words
The medium of claim 1, further characterized by said material within said second zone having a higher glass transition temperature than said material within said first zone.
Claim 7
Independent Claim 67 words
A method for constructing a data storage medium comprising: (a) forming a substantially uniform layer of homogenous material on a supporting substrate, said layer having a bottom portion proximate said substrate, and a surface region remote from said substrate; and characterized by (b) treating the surface region of said layer so as to create a zone within said material having different optical properties than said bottom portion.
Claim 8
Independent Claim 67 words
A method for constructing a data storage medium comprising: (a) forming a substantially uniform layer of homogenous material on a supporting substrate, said layer having a bottom portion proximate said substrate, and a surface region remote from said substrate; and characterized by (b) treating the surface region of said layer so as to create a zone within said material having different optical properties than said bottom portion.
Claim 9
Dependent Claim 31 words
The method of claim 6, further characterized by treating the surface region of said layer so as to cause said surface region to have different thermal-mechanical properties than said bottom portion.
Claim 10
Dependent Claim 18 words
The method of claim 6, further characterized by treating the surface region of said layer with a solvent.
Claim 11
Dependent Claim 27 words
The method of claim 6, further characterized by said material including additives, the method further including the step of leaching said additives out of said surface region.
Claim 12
Dependent Claim 27 words
The method of claim 9, further characterized by said additive includes a first dye, further including the step of diffusing a second dye into said surface region.

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