发明名称 |
Drum assembly in magnetic recording/reproducing apparatus and manufacturing method thereof. |
摘要 |
<p>Improvement of a lower cylinder of a drum assembly for a helical scan type magnetic recording/reproducing apparatus, a magnetic tape being wrapped around the drum assembly in a predetermined angular range with respect to its own axis which is wider than a scanning angular range so as to have an additional tape-wrapping angular range on at least a tape-entry portion from which the tape starts to be wrapped around the drum assembly. The lower cylinder integrally has on its outer circumferential surface a tape-guiding portion for guiding the tape on wraping it around the drum assembly, a tape-wrapping portion on which the magentic tape is wrapped along the tape-guiding portion in a direction substantially coincident with a direction of rotation of the upper cylinder and a protruding portion formed in the additional tape-wrapping angular range so as to be protroded by a predetermined amount with respect to the tape-wrapping portion. The protruding portion initially comes into contact with the tape to be entered onto the drum assembly and has a wedge-like shape in which its top is substantially directed in the tape-travelling direction. The protruding amount of the protruding portion with respect to the tape-wrapping portion being substantially equal to a protruding amount of the magnetic head from an upper cylinder of the drum assembly.</p> |
申请公布号 |
EP0318931(A2) |
申请公布日期 |
1989.06.07 |
申请号 |
EP19880119903 |
申请日期 |
1988.11.29 |
申请人 |
VICTOR COMPANY OF JAPAN, LIMITED |
发明人 |
ARAI, MITSUHIRO;TSUCHIYA, EIICHI;IKEDA, TETSUO NIPPON VICTOR SHATAKU 136 |
分类号 |
G11B15/61 |
主分类号 |
G11B15/61 |
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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