Patent ID: 7100860

Claim:
A recording tape cartridge comprising: a case rotatably accommodating a reel on which a recording tape is wound; a reel area rib provided at an inner surface of the case, and defining a range in which the reel is accommodated; and a contact preventing mechanism which is provided at an inner surface of the case, is positioned in a reel hub forming the reel, and prevents contact between the reel area rib and the reel, wherein the contact preventing mechanism is formed from an abutment member which projects from said inner surface of the case, and the abutment member is disposed so as to be positioned in the reel hub, wherein there is a clearance t 1 between the abutment member and an inner surface of the reel hub when the abutment member is positioned in the reel hub, and the clearance t 1 is smaller than a clearance t 2 between the reel area rib and the reel, wherein the case is formed from an upper case and a lower case, and the contact preventing mechanism is provided at the upper case and at the lower case, and wherein a clearance between an abutment member of the upper case and the inner surface of the reel hub is equal to said clearance t 1 and is substantially equal to a clearance between an abutment member of the lower case and the inner surface of the reel hub, and said clearance t 1 is maintained along the entire circumference of the inner surface of the reel hub at the upper and lower portions thereof.