发明授权
- 专利标题: Magneto-optical disc
- 专利标题(中): 磁光盘
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申请号: US503084申请日: 1995-07-17
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公开(公告)号: US5568466A公开(公告)日: 1996-10-22
- 发明人: Tsuyoshi Komaki , Hiroyuki Endo , Hideki Hirata , Isamu Kuribayashi
- 申请人: Tsuyoshi Komaki , Hiroyuki Endo , Hideki Hirata , Isamu Kuribayashi
- 申请人地址: JPX Tokyo
- 专利权人: TDK Corporation
- 当前专利权人: TDK Corporation
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX6-209270 19940810; JPX6-311229 19941121
- 主分类号: G11B5/60
- IPC分类号: G11B5/60 ; G11B11/10 ; G11B11/105 ; G11B21/21 ; G11B11/00 ; G11B3/70
摘要:
A magneto-optical disc includes a recording layer (4) and a protective film (7) of radiation-cured resin on a substrate (2). Information is written in the recording layer with the aid of a magnetic head in sliding contact with the disc. In a first form, when the protective film is subject to a micro-vibration scratch test by setting the disc in a thin film scratch tester equipped with a diamond indentor having a radius of curvature R of up to 50 .mu.m, the relationship: 0.8.ltoreq.L/R.sup.2 .ltoreq.2.7 is met wherein L is the critical load (N.m) under which the thin film is scratched. In a second form, the protective film has a dynamic modulus of 5.0.times.10.sup.9 to 4.0.times.10.sup.10 dyn/cm.sup.2 at 100.degree. C. The disc is highly durable.
公开/授权文献
- US5070185A High shrinkage polyester fibers and method of preparation 公开/授权日:1991-12-03