Metal deforming – Tool and/or tool holder
Patent
1989-08-22
1990-09-04
Larson, Lowell A.
Metal deforming
Tool and/or tool holder
264107, 425810, B21D 3701
Patent
active
049533851
ABSTRACT:
On a cemented carbide alloy disk or a cermet disk having been coated with either an iridium (Ir) alloy film or a ruthenium (Ru) alloy film is formed guide grooves by photography or ECR ion etching. The disk thus obtained is used as an optical or magnetic disk stamper. Next, a glass or aluminium disk is placed between a pair of stampers obtained as above and molded under pressure while heating thereby to make guide grooves of an optical or magnetic disk.
REFERENCES:
patent: 3945240 (1976-03-01), Brown
patent: 4565772 (1986-01-01), Takeoka et al.
"Optical Video-Disk System", H. Kanamaru; Journal of the Institute of Television Engineers of Japan, vol. 32, No. 1, pp. 15-22, 1978.
"Magneto-Optical Disk Substrate Prepared by Reactive Ion Etching", Kenji Ohta et al.; pp. 77-81, 1985.
Aoki Masaki
Fujii Eiji
Kuribayashi Kiyoshi
Monji Hideto
Torii Hideo
Larson Lowell A.
Matsushita Electric - Industrial Co., Ltd.
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