发明授权
- 专利标题： Magnetic tape cassette, guide roller, and a method of manufacturing a guide roller
- 专利标题（中）： 磁带盒，导辊，以及制造导辊的方法
-
申请号： US10246393申请日： 2002-09-19
-
公开(公告)号： US06742739B2公开(公告)日： 2004-06-01
- 发明人: Katsuki Asano , Masayoshi Moriwaki , Shigeru Nishiyama
- 申请人： Katsuki Asano , Masayoshi Moriwaki , Shigeru Nishiyama
- 优先权： JPP.11-346518 19991206; JPP.11-364692 19991222; JPP.11-367946 19991224; JP2000-294540 20000927
- 主分类号： G11B2304
- IPC分类号： G11B2304
摘要：
A magnetic tape cassette and a guide roller in which the magnetic tape can stably travel and the magnetic head can read/write the record correctly, and a method of manufacturing the guide roller are provided. The magnetic tape cassette of the present invention comprises a guide roller (106) rotatably supported by the lower cassette half. The guide roller is almost in the shape of a barrel of which a coefficient of curvature T expressed by the expression [1] representing the extent of curvature of the circumferential surface is in the range between 0.001 and 0.01, and comprises a primary molding and injected resin injected within the primary molding for bulging said primary molding into the shape of said barrel shaped cavity that has a largest diameter at the parting line by the injection pressure.