发明名称 |
Aluminum head drum with a protective layer which smoothly and continuously varies in hardness for use in a videocassette recorder |
摘要 |
An aluminum head drum for use in a video cassette recorder is coated with a protective layer comprising diamond-like carbon. The protective layer of diamond-like carbon is obtained using a plasma-enhanced chemical vapor deposition method and has a thickness ranging from 0.3 mu m to 2.0 mu m. The protective layer has a varying mechanical hardness, wherein the mechanical hardness has a maximum value at a region of the protective layer coming in contact with the aluminum head drum, decreases smoothly and continuously and reaches an minimum value at a region of the protective layer coming in contact with atmosphere. Micro-Vicker's hardness of the region of the protective layers coming in contact with a video tape is 1.5-2.0 times that of the magnetic substance constituting the video tape.
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申请公布号 |
US5883769(A) |
申请公布日期 |
1999.03.16 |
申请号 |
US19970885584 |
申请日期 |
1997.06.30 |
申请人 |
DAEWOO ELECTRONICS CO., LTD. |
发明人 |
CHOI, KYE-CHUL;KIM, KEUM-MO;EUN, KWANG-YONG;LEE, KWANG-RYEOL |
分类号 |
C23C16/26;G11B5/53;G11B15/61;G11B15/62;(IPC1-7):G11B15/60 |
主分类号 |
C23C16/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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