Textured organic optical data storage media and methods of preparation

• US 4,937,119 A
• Filed: 12/15/1988
• Issued: 06/26/1990
• Est. Priority Date: 12/15/1988
• Status: Expired due to Fees

• Current Assignee: Hoechst Celanese Corporation (Sanofi )
• Original Assignee: Hoechst Celanese Corporation (Sanofi )
• Inventors: Goldberg, Harris A., Nikles, David E.
• Primary Examiner(s): Ryan, Patrick
• Application Number:
  US07/284,887
• Time in Patent Office: 558 Days
• Field of Search: 430/311, 430/945, 428/69, 428/65, 428/321.5, 428/323, 428/913, 369/284, 369/288, 346/766, 346/135.1
• US Class Current: 428/64.8
• CPC Class Codes: G11B 7/24 Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the arrangement of information on the carrier G11B7/007
• CPC Class Codes: G11B 7/248 porphines; azaporphines, e.g. phthalocyanines
• CPC Class Codes: G11B 7/26 Apparatus or processes specially adapted for the manufacture of record carriers
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10S 430/146 Laser beam
• CPC Class Codes: Y10T 428/249997 Encapsulated liquid
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles

Abstract

Provided is an optical data storage medium suitable for use with optical recording and playback apparatus and a method of producing the same. The optical data storage medium according to the present invention comprises a textured surfaced information layer comprised of at least one encapsulated dye. The texturing is accomplished without additional treatment steps in the formation of the surface irregularities. Not only does the optical data storage medium of the present invention provide for a high degree of contrast between the medium and recorded information but also allows for the recording of a higher density of information.

Claims

1. An optical data storage medium comprised of a substrate and an organic information layer, wherein said information layer has a textured surface and is capable of a plurality of encoded states, said information layer comprising microcapsules of a plurality of microencapsulated dyes selected from the group consisting of naphthalocyanine, phthalocyanine and porphyrin dyes, and with each of the plurality of microencapsulated dyes have a lambda max at a different wavelength.

2. The optical data storage medium of claim 1, wherein at least one of said plurality of microencapsulated dyes has a lambda max between 750 and 850 nm.

3. The optical data storage medium of claim 1, wherein at least one of said plurality of microencapsulated dyes has a lambda max of between 600 and 700 nm.

4. The optical data storage of claim 1, wherein at least one of said plurality of microencapsulated dyes has a lambda max of between 400 and 500 nm.

5. An optical data storage medium comprised of a substrate and an organic information layer, wherein said information layer has a textured surface and is capable of a plurality of encoded states, said information layer comprising nanocapsules having a relative size of between 1×

10^-9 and 1×

10^-6 meters, with the nanocapsules containing a plurality of encapsulated dyes selected from the group consisting of naphthalocyanine, phthalocyanine and porphyrin dyes, and with each of the plurality of encapsulated dyes having a lambda max at a different wavelength.

6. The optical data storage medium of claim 5, wherein at least one of said plurality of encapsulated dyes has a lambda max of between 750 and 850 nm.

7. The optical data storage medium of claim 5, wherein at least one of said plurality of encapsulated dyes has a lambda max of between 600 and 700 nm.

8. The optical data storage medium of claim 5, wherein at least one of said plurality of encapsulated dyes has a lambda max of between 400 and 500 nm.

9. The optical data storage medium of claim 5, wherein the information layer further comprises microcapsules of microencapsulated dyes selected from the group consisting of naphthalocyanine, phthalocyanine and porphyrin dyes.