Optical information recording medium

• US 6,391,417 B1
• Filed: 10/16/2000
• Issued: 05/21/2002
• Est. Priority Date: 12/02/1997
• Status: Expired due to Fees

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Deguchi, Hiroshi, Yuzurihara, Hajime, Tashiro, Hiroko
• Primary Examiner(s): MULVANEY, ELIZABETH EVANS
• Application Number:
  US09/688,616
• Time in Patent Office: 582 Days
• Field of Search: 428/64.1, 428/64.2, 428/64.4, 428/64.5, 428/64.6, 428/913, 430/270.13, 430/495.1, 430/945, 369/283, 369/288
• US Class Current: 428/64.1
• CPC Class Codes: C22C 12/00 Alloys based on antimony or bismuth
• CPC Class Codes: G11B 2007/24308 transition metal elements of group 11 (Cu, Ag, Au)
• CPC Class Codes: G11B 2007/2431 group 13 elements (B, Al, Ga, In)
• CPC Class Codes: G11B 2007/24314 group 15 elements (e.g. Sb, Bi)
• CPC Class Codes: G11B 2007/24316 group 16 elements (i.e. chalcogenides, Se, Te)
• 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 7/243 comprising inorganic materials only, e.g. ablative layers
• CPC Class Codes: G11B 7/2433 Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
• CPC Class Codes: G11B 7/252 of layers other than recording layers
• CPC Class Codes: G11B 7/257 of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10S 430/146 Laser beam
• CPC Class Codes: Y10T 428/21 Circular sheet or circular blank
• CPC Class Codes: Y10T 428/31678 Of metal

Abstract

An optical information recording medium includes a first dielectric protective layer, a recording layer provided on the first dielectric protective layer, including a material represented by a chemical formula of AgαInβSbγTeδ, wherein α, β, γ and δ respectively represent an atomic percent of Ag, an atomic percent of In, an atomic percent of Sb, and an atomic percent of Te, and satisfy the conditions of:

1≦α<10,

1<β≦20,

35≦γ≦70,

20≦δ≦35,

α+β+γ+δ=100,

4β−δ≦0,

γ−2δ≧0, and

γ−8α≧0,

a second dielectric protective layer provided on the recording layer, and a light reflection and heat dissipation layer provided on the second dielectric protective layer.

Claims

1. An optical information recording medium comprising:

a first dielectric protective layer,

a recording layer provided on said first dielectric protective layer, comprising a material represented by a chemical formula of Agα

Inβ

Sbγ

Teδ

, wherein α

, β

, γ and

δ

respectively represent an atomic percent of Ag, an atomic percent of In, an atomic percent of Sb, and an atomic percent of Te, and satisfy the conditions of;

1≦

α

<

10,

1<

β

≦

7,

35≦

γ

≦

70,

20≦

δ

≦

35,

α

+β

+γ

+δ

=100,

4β

−

δ

≦

0,

γ

−

2δ

≧

0, and

γ

−

8α

≧

0,

a second dielectric protective layer provided on said recording layer, and

a light reflection and heat dissipation layer provided on said second dielectric protective layer.