Recording tape cartridge

A recording tape cartridge comprising:

• a reel having a cylindrical hub with a bottom and a reel gear formed therein with recording tape wound around the outer peripheral surface of the hub;
• a casing in which the reel is singly and rotatably accommodated;
• a brake component that is provided inside the hub and made to be non-rotatable relative to the casing and which, when not in use, engages an engaging portion formed in the hub and blocks rotation of the reel;
• and
• a releasing component that is provided between the bottom of the hub and the brake component and which has a plurality of legs inserted through a plurality of through-holes formed on the reel gear where, when in use, the plurality of legs are pressed upwards by a drive gear of a drive device, whereby the releasing component lifts the brake component, releases engagement with the engaging portion and rotates with the reel,
• wherein the plurality of legs are formed into approximate D shapes in plan view whose outer side surfaces facing an inner peripheral surface of the hub are curved surfaces parallel to the inner peripheral surface of the hub, while the plurality of through-holes are formed into approximate D shapes in plan view through which the plurality of legs can each be inserted.

A recording tape cartridge comprising:

• a reel having a cylindrical hub with a bottom and a reel gear formed therein with recording tape wound around the outer peripheral surface of the hub;
• a casing in which the reel is singly and rotatably accommodated;
• a brake component that is provided inside the hub and made to be non-rotatable relative to the casing and which, when not in use, engages an engaging portion formed in the hub and blocks rotation of the reel;
• and
• a releasing component that is provided between the bottom of the hub and the brake component and which has a plurality of legs inserted through a plurality of through-holes formed on the reel gear where, when in use, the plurality of legs are pressed upwards by a drive gear of a drive device, whereby the releasing component lifts the brake component, releases engagement with the engaging portion and rotates with the reel,
• wherein the plurality of legs are formed into approximate D shapes in plan view whose outer side surfaces facing an inner peripheral surface of the hub have a radius of curvature that is two times or more the radius of curvature of inner side surfaces thereof, while the plurality of through-holes are formed into approximate D shapes in plan view through which the plurality of legs can each be inserted.