| 摘要 |
A cartridge gear (1a) which is formed in an annular shape around the rotational center (CL1) and secured to a reel of a tape cartridge (1) loaded in a drive device (30) has a tapered shape having a first inclination angle which is lower in height as the tooth tops thereof approach to the innermost peripheral edge. A drive gear (22) which is formed in an annular shape around the rotational center (CL2) and connected to a reel motor (24) of the drive device (30) has a tapered shape having a second inclination angle which is lower in height as the tooth tops thereof approach to the outermost peripheral edge, the second inclination angle being smaller than the first inclination angle. The tapered shape of the drive gear (22) is formed in an area which extends outwardly from the radially-innermost position of the drive gear (22) at which lock pads (1b) abut against the drive gear (22) under the state that the drive gear (22) and the cartridge gear (1a) are in proper engagement with each other.
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