Information recording medium

• US 4,943,515 A
• Filed: 02/10/1989
• Issued: 07/24/1990
• Est. Priority Date: 12/17/1986
• Status: Expired due to Term

• Current Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Kawatta, Ken, Okazaki, Masaki, Yabe, Masao
• Primary Examiner(s): Michl, Paul R.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/310,023
• Time in Patent Office: 529 Days
• Field of Search: 430/270, 430/495, 430/945, 430/618, 430/570, 430/581, 430/592
• US Class Current: 430/270.11
• CPC Class Codes: G03C 1/494 Silver salt compositions other than silver halide emulsions; Photothermographic systems ; Thermographic systems using noble metal compounds
• CPC Class Codes: G11B 2007/24612 two or more dyes in one layer
• CPC Class Codes: G11B 7/247 methine or polymethine dyes
• CPC Class Codes: G11B 7/2472 cyanine
• CPC Class Codes: G11B 7/2475 merocyanine
• CPC Class Codes: G11B 7/249 containing organometallic compounds G11B7/246 takes precedence
• CPC Class Codes: G11B 7/2533 comprising resins
• CPC Class Codes: Y10S 430/146 Laser beam

Abstract

A novel information recording medium comprising a substrate and a recording layer for writing and/or reading information by means of a laser beam which is provided on the substrate is disclosed. The recording layer contains a dye having at least one chromophore selected from the group consisting of an amidinium ion chromophore, a carboxyl ion chromophore and a dipolar amide chromophore, and an organic solvent-soluble silver salt. Alternatively, the recording layer contains said chromophore and this recording layer is arranged in contact with a layer of an organic solvent-soluble silver salt.

Claims

1. A method for recording information comprising irradiating a recording medium which comprises a substrate and a recording layer containing an organic solvent-soluble silver salt and a dye having at least one chromophore selected from the group consisting of an amidinium ion chromophore, a carboxyl ion chromophore and a dipolar amide chromophore, with a laser beam to form pits corresponding to the information in the recording layer.

2. The information recording method as claimed in claim 1, wherein said dye is a merocyanine dye.

3. The information recording method as claimed in claim 2, wherein said dye is a merocyanine dye having the formula (I):

##STR19## in which Z is a nonmetal atom group or a combination of nonmetal atoms required for forming a 5-6 membered heterocyclic ring;

Q is a combination of nonmetal atoms group required for forming a 5-6 membered heterocyclic ring containing a nitrogen atom;

each of L¹ and L² is a methine group or a substituted methine group;

l is 1 or 2, m is 3 or 4, and l and m are integers satisfying the condition of l+m=5;

R¹ is an alkyl group having 1-18 carbon atoms, an allyl group or a group having the following formula;

##STR20## in which Y is a cyclic imide group, and each of h and i is an integer of 2 to 5; and

R² is bonded to the nitrogen atom of said heterocyclic ring and is an alkyl group having 1-18 carbon atoms, a substituted alkyl group, an allyl group, an aryl group, a substituted aryl group, a heterocyclic group or a group having the following formula;

##STR21## in which Y, h and i have the same meanings as defined above.

4. A method for recording information comprising irradiating a recording medium which comprises a substrate, a recording layer containing a dye having at least one chromophore selected from the group consisting of an amidinium ion chromophore, a carboxyl ion chromophore and a dipolar amide chromophore, and an organic solvent-soluble silver salt-containing layer arranged in contact with the recording layer, with a laser beam to form pits corresponding to the information in the recording layer.

5. The information recording method as claimed in claim 4, wherein said dye is a merocyanine dye.

6. The information recording method as claimed in claim 4, wherein said dye is a merocyanine dye having the formula (I):

##STR22## in which Z is a nonmetal atom group or a combination of nonmetal atoms required for forming a 5-6 membered heterocyclic ring;

Q is a combination of nonmetal atoms group required for forming a 5-6 membered heterocyclic ring containing a nitrogen atom;

each of L¹ and L² is a methine group or a substituted methine group;

l is 1 or 2, m is 3 or 4, and l and m are integers satisfying the condition of l+m=5;

R¹ is an alkyl group having 1-18 carbon atoms, a substituted alkyl group, an allyl group or a group having the following formula;

##STR23## in which Y is a cyclic imide group, and each of h and i is an integer of 2 to 5; and

R² is bonded to the nitrogen atom of said heterocyclic ring and is an alkyl group having 1-18 carbon atoms, a substituted alkyl group, an allyl group, an aryl group, a substituted aryl group, a heterocyclic group or a group having the following formula;

##STR24## in which Y, h and i have the same meanings as defined above.

7. A method for reading information recorded in the form of pits in a recording layer provided on a substrate wherein the recording layer contains an organic solvent-soluble silver salt and a dye having at least one chromophore selected from the group consisting of an amidinium ion chromophore, a carboxyl ion chromophore and a dipolar amide chromophore, by irradiating the recording layer with a laser beam to detect the pits.

8. The information reading method as claimed in claim 7, wherein said dye is a merocyanine dye.

9. The information reading method as claimed in claim 7, wherein said dye is a merocyanine dye having the formula (I):

##STR25## in which Z is a nonmetal atom group or a combination of nonmetal atoms required for forming a 5-6 membered heterocyclic ring;

Q is a combination of nonmetal atoms group required for forming a 5-6 membered heterocyclic ring containing a nitrogen atom;

each of L¹ and L² is a methine group or a substituted methine group;

l is 1 or 2, m is 3 or 4, and l and m are integers satisfying the condition of l+m=5;

R¹ is an alkyl group having 1-18 carbon atoms, an allyl group or a group having the following formula;

##STR26## in which Y is a cyclic imide group, and each of h and i is an integer of 2 to 5; and

R² is bonded to the nitrogen atom of said heterocyclic ring and is an alkyl group having 1-18 carbon atoms, a substituted alkyl group, an allyl group, an aryl group, a substituted aryl group, a heterocyclic group or a group having the following formula;

##STR27## in which Y, h and i have the same meanings as defined above.

10. A method for reading information recorded in the form of pits in a recording layer provided on a substrate wherein said recording layer is arranged in contact with a layer containing an organic solvent-soluble silver salt and contains a dye having at least one chromophore selected from the group consisting of an amidinium ion chromophore, a carboxyl ion chromophore and a dipolar amide chromophore, by irradiating the recording layer with a laser beam to detect the pits.

11. The information reading method as claimed in claim 10, wherein said dye is a merocyanine dye.

12. The information reading method as claimed in claim 10, wherein said dye is a merocyanine dye having the formula (I):

##STR28## in which Z is a nonmetal atom group or a combination of nonmetal atoms required for forming a 5-6 membered heterocyclic ring;

Q is a combination of nonmetal atoms group required for forming a 5-6 membered heterocyclic ring containing a nitrogen atom;

each of L¹ and L² is a methine group or a substituted methine group;

l is 1 or 2, m is 3 or 4, and l and m are integers satisfying the condition of l+m=5;

R¹ is an alkyl group having 1-18 carbons atoms, a substituted alkyl group, an allyl group or a group having the following formula;

##STR29## in which Y is a cyclic imide group, and each of h and i is an integer of 2 to 5; and

R² is bonded to the nitrogen atom of said heterocyclic ring and is an alkyl group having 1-18 carbon atoms, a substituted alkyl group, an allyl group, an aryl group, a substituted aryl group, a heterocyclic group or a group having the following formula;

##STR30## in which Y, h and i have the same meanings as defined above.