Reel spring for use of a magnetic tape cassette and a magnetic tape cassette

摘要

The reel spring for use in a magnetic tape cassette comprises a fixing portion which is fixed to a boss of a cassette case by means of a boss hole, an arm portion which forces a reel in an axial direction of rotation and a bending portion provided between the fixing portion and the arm portion in an L-like shape. The ratio of a length of the fixing portion of the reel spring to a height of the boss is 4.0 or more. The length of the fixing portion is longer than that of the arm portion by 1 mm to 5 mm. The magnetic tape cassette employs the reel spring which is capable of enhancing production efficiency in fabricating the magnetic tape cassette while maintaining a specified force of the reel spring.