Optical recording medium

Details Optical recording medium Optical recording medium

1990-05-25

1992-03-03

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428457, 428913, 430945, 346 76L, 3461351, 3692751, 369284, 369286, 369288, B32B 302

Patent

active

050931741

ABSTRACT:
A metal reflecting layer of an aluminum or silver alloy containing gold has a lower thermal conductivity than aluminum or silver and gold while maintaining a high reflectivity, and thus an optical recording medium, particularly a magneto-optical recording medium, having a high recording sensitivity and a C/N ratio, as well as an improved durability, can be provided. The content of Au in the Al alloy is 0.5-20 at % and that in the silver alloy is 0.5-30 at %. Preferably, at least one of the group consisting of titanium, tantalum, zirconium and yittrium is added to an alloy of Al or Ag with Au, and the content of at least one of the group consisting of titanium, tantalum, zirconium and yittrium is preferably 0.3-5.0 at % in an Al-Au alloy and 0.3-12.0 at % in an Ag-Au alloy. More preferably, the total content of Au and at least one of the group consisting of titanium, tantalum, zirconium and yittrium is 1.0-15 at %.

REFERENCES:
patent: 4430659 (1984-02-01), Maffitt et al.
patent: 4547876 (1985-10-01), Ettenberg
patent: 4556893 (1985-12-01), Rinehart et al.
patent: 4638335 (1987-01-01), Smith et al.
patent: 4754128 (1988-06-01), Takeda et al.
patent: 4820778 (1989-04-01), Ohtani et al.
patent: 4839883 (1989-06-01), Nagata et al.

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