Optical information recording medium

• US 6,258,509 B1
• Filed: 07/31/1998
• Issued: 07/10/2001
• Est. Priority Date: 07/31/1997
• Status: Expired due to Fees

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Usami, Yoshihisa, Shibata, Michihiro
• Primary Examiner(s): Angebranndt, Martin
• Application Number:
  US09/126,605
• Time in Patent Office: 1,075 Days
• Field of Search: 430/945, 430/270.2, 430/270.21, 430/270.19, 369/288
• US Class Current: 430/270.19
• CPC Class Codes: G11B 2007/24612 two or more dyes in one layer
• 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 7/245 containing a polymeric component
• CPC Class Codes: G11B 7/246 containing dyes
• CPC Class Codes: G11B 7/2472 cyanine
• CPC Class Codes: G11B 7/2478 oxonol
• CPC Class Codes: G11B 7/2534 polycarbonates [PC]
• CPC Class Codes: G11B 7/256 of layers improving adhesion between layers
• CPC Class Codes: G11B 7/259 based on silver

Abstract

An optical information recording medium is composed of a substrate, a recording dye layer on which information can be recorded by irradiation with a laser beam, and a light-reflecting layer overlaid in order, in which the recording dye layer employs a dye having an organic counter ion (such as a cyanine dye of the formula (I):

[DYE⁺]_nXⁿ⁻  (I)

in which DYE⁺ is a monovalent cyanine dye cation, n is an integer not less than 2, and Xⁿ⁻ is an organic n-valent anion), and the light-reflecting layer is made of Ag or Ag-containing alloy.

Claims

1. An optical information recording medium comprising a substrate, a recording dye layer on which information can be recorded by irradiation with a laser beam, and a light-reflecting layer overlaid in order, wherein

the recording dye layer comprises a quencher and a cyanine dye of the following formula (I):

2. The optical information recording medium of claim 1, wherein the cyanine dye is represented by the following formula (II):

in which each of Za and Zb independently represents an atomic group required for forming a 5- or 6-membered nitrogen-containing heterocyclic ring;

each of R¹ and R² independently represents an alkyl group or an aryl group;

each of L¹, L², L³, L⁴ and L⁵ independently represents a methine group which may have a substituent group, and in the case where at least two of L¹ to L⁵ have a substituent group, one of L¹ to L⁵ may be combined with another of L¹ to L⁵ to form a ring;

j represents 0, 1 or 2;

k represents 0 or 1;

Xⁿ⁻

is an aromatic disulfonate ion or an aromatic trisulfonate ion and n is 2 or 3.

3. The optical information recording medium of claim 2, wherein each of Za and Zb independently represents an atomic group required for forming a nucleus selected from the group consisting of benzothiazole nucleus, imidazole nucleus, naphthoimidazole nucleus, quinoline nucleus, isoquinoline nucleus, imidazo (4, 5-b) quinoxaline nucleus, thiadiazole nucleus, tetrazole nucleus, and pyrimidine nucleus.

4. The optical information recording medium of claim 2, wherein each of Za and Zb independently has a substituent group selected from the group consisting of a halogen atom, an alkyl group, an alkyl group having a substituent group, and an aryl group.

5. The optical information recording medium of claim 1, wherein the cyanine dye is represented by the following formula (IIA):

in which each of Z¹ and Z² independently represents an atomic group required for forming an indolenine nucleus or a benzoindolenine nucleus;

each of R¹ and R² independently represents an alkyl group or an aryl group;

each or R³, R⁴, R⁵ and R⁶ independently represents an alkyl group;

each of L¹, L², L³, L⁴ and L⁵ independently represents a methine group which may have a substituent group, and in the case where at least two of L¹ to L⁵ have a substituent group, one of L¹ to L⁵ may be combined with another of L¹ to L⁵ to form a ring;

j represents 0, 1 or 2;

k represents 0 or 1;

Xⁿ⁻

is an aromatic disulfonate ion or an aromatic trisulfonate ion and n is 2 or 3.

6. The optical information recording medium of claim 5, wherein each of Z ¹ and Z² independently has a substituent group selected from the group consisting of a halogen atom and an aryl group.

7. The optical information recording medium of claim 1, wherein the quencher is a compound having the following formula (A1) or (A2):

in which R²¹ and R²² independently represents a hydrocarbon group.

8. The optical information recording medium of claim 7, wherein the compound of the formula (A1) or (A2) is contained in the recording dye layer in an amount of 0.1 to 50 weight %, based on the amount of the dye.

9. The optical information recording medium of claim 1, wherein the quencher is a compound having the following formula (A1):

in which R²¹ and R²² independently represents an alkyl group of straight chain or branched chain which has 1 to 10 carbon atoms and no substituent group.

10. The optical information recording medium of claim 1, wherein the light-reflecting layer has a protective layer thereon.

11. The optical information recording medium of claim 1, wherein the substrate comprises polycarbonate.

12. The optical information recording medium of claim 1, wherein the recording dye layer further comprises a binder resin in an amount of 0.01 to 50 weight %, based on the amount of the dye.

13. The optical information recording medium of claim 1, wherein the substrate has on its surface a pregroove having a depth in the range of 100 to 3,000 angstroms and a half width in the range of 0.2 to 0.9 μ

m.