Patent EP0263641A2 successfully refreshed from Google Patents.
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
•
Granted: —
•
Expires: 2007-09-30
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 01:27
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.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.