| 摘要 |
<p>A tape reel having an improved reliability during high-speed transport of the magnetic tape by improving the molding quality of the flange portion of the tape reel and a tape cartridge having this are disclosed. Reference faces (152v) are provided between a chucking gear (152b) and an outer circumferential rib (152r2) outside the chucking gear (152b), independently of the outer circumferential rib (152r2). Each of the reference faces (152v) is composed two faces: a first rib (152v1) extending circumferentially and a second rib (152v2) extending perpendicularly to the first rib (152v1). The volume of the portions forming the reference faces (152v) is small, and consequently the sink marks after the resin is cured are suppressed, the molding quality of the flange portion (152) is improved. Consequently, the straight-ahead transportability of the magnetic tape during high-speed transport and the reliability of recording/reproduction are both improved..</p> |
