Patent ID: 6595450
Filing Date: 2003-07-22
Classification: B29C,B29L,G11B

Abstract:
A magnetic tape cassette comprising;a cassette case including an upper cassette half and an lower cassette half; a pair of tape reels with a magnetic tape wound therearound; and a guide roller for transferring said magnetic tape rotatably supported within said cassette case so that the magnetic tape is guided by said guide roller and travels at a prescribed position, wherein said guide roller is generally barrel shaped, and a coefficient of curvature T expressed by the expression [1] which represents the extent of curvature of the outer circumferential surface thereof is between 0.001 and 0.01 both inclusive, T=&Dgr;/(L&PHgr;max)â€ƒâ€ƒ[1]wherein &Dgr; represents a difference between the maximum diameter and the minimum diameter of the outer circumferential surface of the guide roller (mm), L represents the axial length of the guide roller, and &PHgr;max is a maximum diameter (mm) of the circumferential surface of the guide roller (mm).