公开(公告)号：US06729570B1

公开(公告)日：2004-05-04

申请号：US09913612

申请日：2001-08-16

申请人： Naoto Murao ,  Makoto Sato ,  Mitsugu Yamagishi ,  Kiyoo Morita

发明人： Naoto Murao ,  Makoto Sato ,  Mitsugu Yamagishi ,  Kiyoo Morita

IPC分类号： G11B23087

CPC分类号： G11B23/08728 ,  G11B5/78 ,  G11B23/037

摘要： A tape reel (10) is so constructed that an upper flange (12) and a lower flange (13) are respectively provided at an upper and a lower ends of a cylindrical reel hub (11) around which a magnetic tape (20) is wound, and a maximum value of a distance from the upper flange (12) and the lower flange (13) to lateral ends of the magnetic tape (20) is set to be 0.5 mm or more, and less than 1.0 mm. The magnetic tape (20) includes a nonmagnetic substrate (21), a magnetic layer (22) provided on one face of the nonmagnetic substrate and a back layer (23) provided on the other face of the nonmagnetic substrate, and in a state where the magnetic tape is wound around the tape reel (10), a distance (U1+D1) from the upper flange (12) and the lower flange (13) to lateral ends of the back layer (23) is larger than a distance (U2+D2) from the upper flange (12) and the lower flange (13) to lateral ends of the nonmagnetic substrate (21) or lateral ends of the magnetic layer (22). Further, a magnetic tape cassette is provided with at least one of the above described tape reel (10) and the magnetic tape (20). Owing to the above described structure, it is possible to provide the tape reel, the magnetic tape and the magnetic tape cassette in which dropout and output variation are restrained and irregular winding can be prevented.

摘要翻译： 磁带卷盘（10）的结构使得在圆柱形卷轴毂（11）的上端和下端分别设有上凸缘（12）和下凸缘（13），磁带（20）围绕磁带 并且从上凸缘（12）和下凸缘（13）到磁带（20）的横向端的距离的最大值设定为0.5mm以上且小于1.0mm。 磁带（20）包括非磁性基板（21），设置在非磁性基板的一个面上的磁性层（22）和设置在非磁性基板的另一面上的背面层（23） 磁带卷绕在磁带卷轴（10）上，与上凸缘（12）和下凸缘（13）之间距后背层（23）的横向端的距离（U1 + D1）大于距离（ U2 + D2）从上凸缘（12）和下凸缘（13）到非磁性基板（21）的侧端或磁性层（22）的侧端。 此外，磁带盒设置有上述带盘（10）和磁带（20）中的至少一个。 由于上述结构，可以提供抑制了压差和输出变化的带盘，磁带和磁带盒，并且可以防止不规则的卷绕。