Communication device, magnetic tape cartridge unit and manufacturing method thereof, and noncontact management method of magnetic tape cartridge

A communication device comprising:

• a processor;
• and
• a memory connected to or incorporated in the processor, wherein:
• the processor transmits a characteristic change command to disable communication between the communication device and a communicatee by changing a characteristic to one or more magnetic tape cartridges, in a case where crosstalk occurs between the communication device and a communication circuit included in each of the magnetic tape cartridges included in a magnetic tape cartridge unit,
• the magnetic tape cartridge unit includes the magnetic tape cartridges stacked in a height direction, each of the magnetic tape cartridges has an antenna coil formed in a substrate, the communication circuit that communicates with the communicatee using power induced by application of a magnetic field from the communicatee to the antenna coil, and a case in which a reference plane being a reference in the height direction is formed,
• the substrate is inclined at an inclination angle of less than 45 degrees with respect to the reference plane, and
• the magnetic tape cartridges are stacked in a predetermined orientation in the height direction in the magnetic tape cartridge unit, such that adjacent magnetic tape cartridges contact each other, the reference planes of the magnetic tape cartridges are in parallel, and the inclination angles of the substrates relative to the reference planes and positions of the substrates in the reference planes conform among the magnetic tape cartridges.

A noncontact management method of a magnetic tape cartridge comprising:

• applying a magnetic field from a side opposite a reference plane to a coil forming surface of a substrate, an antenna coil being formed in the coil forming surface, in a first environment in which the magnetic tape cartridge is loaded into a magnetic tape drive, a plurality of the magnetic tape cartridges each including an antenna coil formed in a substrate, a communication circuit that communicates with a communicatee using power induced by application of a magnetic field from the communicatee to the antenna coil, and a case in which the reference plane being a reference in a height direction is formed, the substrate being inclined at an inclination angle of less than 45 degrees with respect to the reference plane;
• and
• applying a magnetic field from a side across a normal direction of the reference plane and confronting the coil forming surface to the coil forming surface, in a second environment in which a magnetic tape cartridge unit is present outside the magnetic tape drive, the magnetic tape cartridge unit including the plurality of the magnetic tape cartridges stacked in a predetermined orientation in the height direction, such that adjacent magnetic tape cartridges contact each other, the reference planes of the plurality of the magnetic tape cartridges being in parallel, and the inclination angles of the substrates relative to the reference planes and positions of the substrates in the reference planes conforming among the plurality of the magnetic tape cartridges.