Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1985-06-05
1987-06-16
Lesmes, George F.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
369288, 428215, 428221, 428414, 428416, 428418, 4284231, 4284235, 4284258, 428458, 428694, 428900, 430945, G11B 2342, G11B 724
Patent
active
046736026
ABSTRACT:
A composite substrate plate for a magnetic or optical disk, comprising a metal plate, an undercoat resin layer formed on one side or both sides of said metal plate, and a surface resin layer having a mirrorlike surface formed on said undercoat resin layer. Such a composite substrate plate is obtained by placing a liquid resin for forming the surface resin layer on the undercoat resin layer formed on one side or both sides of said metal plate or, alternatively, on one or two mirror-finished surfaces of molding plates for imparting a mirrorlike surface to said surface resin layer, then assembling the metal plate and the one or two molding plates so that one side or both sides of said metal plate carrying the undercoat resin layer and the liquid resin may be brought into contact with the one or two clean mirrorlike surfaces of molding plates or, alternatively, one side or both sides of said metal plate carrying the undercoat resin layer and no liquid resin may be brought into contact with the one or two liquid resin-bearing surfaces of molding plates, subsequently allowing the liquid resin to cure, and removing the one or two mirror-finished molding plates.
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patent: 4592939 (1986-06-01), Temple et al.
patent: 4598017 (1986-07-01), Bayer et al.
Inui Keita
Nakayama Syoichi
Suzuki Setsuo
Atkinson William M.
Lesmes George F.
Sumitomo Bakelite Company Limited
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