Optical record medium having an improved reflection thin film

• US 5,058,098 A
• Filed: 02/09/1989
• Issued: 10/15/1991
• Est. Priority Date: 02/17/1988
• Status: Expired due to Fees

• Current Assignee: Victor Company of Japan Limited (JVC Kenwood Corporation)
• Original Assignee: Victor Company of Japan Limited (JVC Kenwood Corporation)
• Inventors: Iida, Noriyuki, Sakaue, Mami
• Primary Examiner(s): Ro, Bentsu
• Application Number:
  US07/308,080
• Time in Patent Office: 978 Days
• Field of Search: 369/284, 369/288, 346/135.1, 346/137, 250/486.1, 250/487.1, 250/488.1, 427/12, 427/53.1, 427/123, 427/191, 427/192, 427/222, 428/328, 428/433, 428/689, 428/697, 430/13, 430/14, 430/85, 430/86, 430/275, 430/277, 430/278
• US Class Current: 369/284
• CPC Class Codes: G11B 7/258 of reflective layers
• CPC Class Codes: G11B 7/2585 based on aluminium

Abstract

An optical information signal record medium which comprises a substance of a desired form having information signals encoded on at least one side thereof, a reflection thin layer of a Cu alloy, and a protective layer formed on the substrate in this order. The reflection thin layer is made of an alloy such as a Cu-Ni alloy, a Cu-Al alloy or a Cu-Ni-Al alloy each having a defined composition.

Claims

1. An optical information signal record medium comprising a resin substrate having information signals encoded on at least one side thereof, a reflection thin film formed on the at least one side, and a protective layer formed on the reflection thin film, said reflection thin film being made of a Cu-Ni alloy consisting essentially of from 3 to 22 atomic percent of Ni and the balance of Cu.

2. An optical information signal record medium according to claim 1, wherein said Cu-Ni alloy has a content of Ni of from 4 to 6 atomic percent.

3. An optical information signal record medium according to claim 2, further comprising from 0 to 9 atomic percent of aluminium.

4. An optical information signal record medium according to claim 1, further comprising a print layer formed on the protective layer.

5. An optical information signal record medium according to claim 1, wherein said substrate has information signals encoded on one side thereof.