Optical recording medium

• US 6,194,121 B1
• Filed: 01/21/1998
• Issued: 02/27/2001
• Est. Priority Date: 09/25/1982
• Status: Expired due to Fees

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Nakagawa, Shiro, Kuroiwa, Akihiko, Namba, Kenryo
• Primary Examiner(s): ANGEBRANNDT, MARTIN J
• Application Number:
  US09/010,010
• Time in Patent Office: 1,133 Days
• Field of Search: 430/945, 430/270.21, 430/270.19, 430/270.2, 430/273.1, 369/283, 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 2007/25706 containing transition metal elements (Zn, Fe, Co, Ni, Pt)
• CPC Class Codes: G11B 2007/25708 containing group 13 elements (B, Al, Ga)
• CPC Class Codes: G11B 2007/25715 containing oxygen
• CPC Class Codes: G11B 7/245 containing a polymeric component
• CPC Class Codes: G11B 7/2467 azo-dyes
• CPC Class Codes: G11B 7/2472 cyanine
• CPC Class Codes: G11B 7/248 porphines; azaporphines, e.g. phthalocyanines
• CPC Class Codes: G11B 7/2492 neutral compounds
• CPC Class Codes: G11B 7/2495 as anions
• CPC Class Codes: G11B 7/2533 comprising resins
• CPC Class Codes: G11B 7/2534 polycarbonates [PC]
• CPC Class Codes: G11B 7/2572 consisting essentially of organic materials
• CPC Class Codes: Y10S 430/146 Laser beam

Abstract

An optical recording medium has deposited on a substrate a recording layer incorporating therein a cyanine dye, preferably an indoline dye, and optionally incorporating therein an autoxidizable compound or a thermoplastic resin and/or a singlet oxygen quencher.

Claims

1. An optical recording medium of the heat mode type comprising a substrate, a recording layer comprising:

A;

a layer comprising at least one laser light absorbing dye mixed with at least one quencher.

B;

a reflection layer in this order, said dye being represented by the formula I;

2. An optical recording medium according to claim 1, wherein said quencher is a transition metal chelate compound.

3. An optical recording medium according to claim 1, wherein L is selected from the groups represented by the following formulae:

wherein Y is selected from the group consisting of hydrogen, lower alkyl, lower alkoxy, cycloalkyl, dimethyl amino, diphenyl amino, methylphenyl amino, morpholino, imidazolidine, ethoxycarbonyl, piperazine, alkylcarbonyloxy, methylthio, halogen atoms, cyano and nitro.

4. An optical recording medium according to claim 1 wherein φ

and ψ

each denote a group represented by the formulae;

wherein R₅ and R₁₁ each denote a substituted or unsubstituted alkyl or aryl group;

R₆ and R₇ each denote an alkyl or aryl group;

R₈ denotes an alkyl, aryl, heterocyclic, hydrogen, halogen, alkylthio, alkylhydroxycarbonyl, or carboxylic group or halogen, p, q, r, and s when associated with R₈ may be the same or different and denote an integer of 0 to 4;

R¹, R⁴, R⁵, R⁶, R⁶40 , R⁷, R⁸, R⁹ and R¹⁰ which may be the same or different denote alkyl, aryl, heterocyclic, halogen, alkoxy, alkylthio, alkylhydroxycarbonyl, or carboxylic; and

p, s, t, u, u′

, v, w, x, y and z each denote the integer 0 or at least 1.

5. An optical recording medium according to claim 1 wherein the recording layer contains from about 0.05 to about 1.2 moles of at least one added quencher per mole of dye.

6. An optical recording medium according to claim 1 wherein the anion is selected from the group consisting of iodide, bromide, perchlorate, boron tetrafluoride, p-chlorobenzene sulfonate and p-methylbenzene sulfonate.