Optical information recording medium

Patent metadata

Field	Value
Publication number	US-9406332-B2
Application number	US-201514845492-A
Country	US
Kind code	B2
Filing date	Sep 4, 2015
Priority date	Mar 8, 2013
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

An optical information recording medium includes at least one recording layer. The recording layer includes a recording material comprising a polymer compound to which a one-photon absorption dye is bonded, and a coupling strength Δ 2 between the one-photon absorption dye and the polymer compound in the recording material is higher than a coupling strength estimated to be exerted between the same one-photon absorption dye and the same polymer compound if the one-photon absorption dye is dispersed in the polymer compound in the recording material.

First claim

What is claimed is:

1. An optical information recording medium comprising at least one recording layer,
wherein the recording layer includes a recording material comprising a polymer compound to which a one-photon absorption dye is bonded, and
wherein a coupling strength Δ 2 between the one-photon absorption dye and the polymer compound in the recording material is higher than a coupling strength estimated to be exerted between the same one-photon absorption dye and the same polymer compound if the one-photon absorption dye is dispersed in the polymer compound in the recording material,
wherein the number of atoms involved in bonding of the one-photon absorption dye to the polymer compound is less than 10.

2. The optical information recording medium according to claim 1 , wherein an intermediate layer is provided between two adjacent recording layers.

3. The optical information recording medium according to claim 2 , wherein each recording layer has a first interface and a second interface between the recording layer and two intermediate layers sandwiching the recording layer, and
wherein at least one of the first and second interfaces is configured to have a protrusion formed by irradiation with a recording beam, the protrusion sticking out into one of the intermediate layers.

4. The optical information recording medium according to claim 3 , wherein a thickness of the recording layer is equal to or greater than 50 nm.

5. The optical information recording medium according to claim 3 , wherein the intermediate layer forming the interface in which the protrusion is formed is softer than the recording layer.

6. The optical information recording medium according to claim 3 , wherein a glass transition temperature of the intermediate layer forming the interface in which the protrusion is formed is lower than a glass transition temperature of the recording layer.

7. The optical information recording medium according to claim 3 , wherein the intermediate layer forming the interface in which the protrusion is formed is an adhesive agent layer.

8. The optical information recording medium according to claim 3 , wherein the protrusion is formed in one of the first interface and the second interface by irradiation with the recording beam, and the protrusion is not formed in the other one of the first interface and the second interface, and
wherein a difference between refractive indices of the intermediate layer and the recording layer is greater at the interface in which the protrusions is formed than at the interface in which the protrusion is not formed.

9. The optical information recording medium according to claim 8 , wherein the difference between the refractive index of the intermediate layer forming the interface in which the protrusion is not formed and the refractive index of the recording layer is equal to or smaller than 0.05.

10. The optical information recording medium according to claim 1 , wherein the recording material is a compound with the following chemical formula:

11. The optical information recording medium according to claim 1 , wherein the recording material is a compound with the following chemical formula:

Assignees

• Fujifilm Corp

Inventors

• Mochizuki Hidehiro
• Watanabe Tetsuya
• Sasaki Toshio
• Mikami Tatsuo
• Nakamura Takumi

Classifications

• G11B7/246 Primary

  containing dyes · CPC title

• G11B7/24038

  Multiple laminated recording layers · CPC title

• G11B7/2405

  being also used as track layers of pre-formatted layers (tracks or pits G11B7/2407) · CPC title

• C09D4/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title

• C08F226/06

  by a heterocyclic ring containing nitrogen · CPC title