Patent ID: 7066421

Claim:
A recording tape cartridge comprising: a reel on which a recording tape is wound; a case which rotatably accommodates the reel; a pressed member which is supported in the case such that the pressed member cannot rotate and can move into and out of contact with the reel along the axis line of the reel; and an elastic member interposed between the case and the pressed member, the elastic member pressing, in a compression state, the pressed member against a portion near a center of rotation of the reel or a member rotating together with the reel during rotation of the reel; wherein a relation μ×L≦0.4 holds where L (mm) is a length of the elastic member along the axis line of the reel during the rotation of the reel, and μ is a coefficient of dynamic friction between the pressed member and the reel or the member rotating together with the reel.