Tape reel, cartridge case, information recording medium, and molding mold

A cartridge case comprising:

• a tape reel constructed so as to be locked in a non-rotatable state by a locking member that is energized toward a base plate of a hub in the form of a bottomed cylinder and so that the non-rotatable state is released by a lock releasing member disposed between the base plate and the locking member;
• and
• a case main body that encloses the tape reel in a rotatable state,
• wherein the base plate is formed so that an inner surface of a central part thereof is higher than an inner surface of an outer circumferential part thereof, through-holes, through which legs disposed on a rear surface of the lock releasing member are inserted so as to be capable of up-down movement, are formed in the outer circumferential part, and contact parts, which contact the rear surface of the lock releasing member in the non-rotatable state are formed so as to protrude in a periphery of the through-holes on an inner surface of the outer circumferential part.

An information recording medium comprising:

• a tape reel constructed so as to be locked in a non-rotatable state by a locking member that is energized toward a base plate of a hub in the form of a bottomed cylinder and so that the non-rotatable state is released by a lock releasing member disposed between the base plate and the locking member;
• a case main body that encloses the tape reel in a rotatable state;
• and
• a magnetic tape wound around the tape reel,
• wherein the base plate is formed so that an inner surface of a central part thereof is higher than an inner surface of an outer circumferential part thereof, through-holes, through which legs disposed on a rear surface of the lock releasing member are inserted so as to be capable of up-down movement, are formed in the outer circumferential part, and contact parts, which contact the rear surface of the lock releasing member in the non-rotatable state are formed so as to protrude in a periphery of the through-holes on an inner surface of the outer circumferential part.