Antenna device, card information medium, electronic apparatus, and method for manufacturing antenna device

A card information medium comprising:

• an antenna;
• and
• a memory;
• wherein
• the antenna includes:
• a multilayer body including a plurality of insulating layers laminated in a lamination direction;
• and
• a coil including a plurality of linear conductors and end-surface conductors, each of the linear conductors being disposed on a surface of the insulating layers and including two end portions and a main portion connecting the two end portion, the two end portions being positioned on outer edges of the insulating layers, each of the end-surface conductors being disposed on an end surface parallel or substantially parallel to the lamination direction, the end-surface conductor connecting the two end portions in the linear conductors in the lamination direction;
• and
• a width of the end-surface conductor is smaller than a width of the main portion, and an interval between the end-surface conductors adjacent to each other is wider than an interval between the main portions being next to each other in a direction parallel or substantially parallel with respect to the surfaces of the insulating layers and the end surface of the multilayer body.

An electronic apparatus comprising:

• an antenna;
• and
• a casing that houses the antenna;
• wherein
• the antenna includes:
• a multilayer body including a plurality of insulating layers laminated in a lamination direction;
• and
• a coil including a plurality of linear conductors and end-surface conductors, each of the linear conductors being disposed on a surface of the insulating layers and including two end portions and a main portion connecting the two end portion, the two end portions being positioned on outer edges of the insulating layers, each of the end-surface conductors being disposed on an end surface parallel or substantially parallel to a lamination direction in which the insulating layers are laminated in the multilayer body, the end-surface conductor connecting the two end portions in the linear conductors in the lamination direction;
• and
• parallel or substantially parallel to a width of the end-surface conductor is smaller than a width of the main portion, and an interval between the end-surface conductors adjacent to each other is wider than an interval between the main portions being next to each other in a direction parallel or substantially parallel with respect to the surface of the insulating layers and the end surface of the multilayer body.

A method for manufacturing an antenna device, the antenna device including:

• a multilayer body including a plurality of insulating layers laminated in lamination direction;
• and
• a coil including a plurality of linear conductors and end-surface conductors, each of the linear conductors being disposed on a surface of the insulating layers and including two end portions and a main portion connecting the two end portion, the two end portions being positioned on outer edges of the insulating layers, each of the end-surface conductors being disposed on an end surface parallel or substantially parallel to a lamination direction in which the insulating layers are laminated in the multilayer body, the end-surface conductor connecting the two end portions in the linear conductors in the lamination direction;
• the method comprising the steps of:
• forming a paste pattern corresponding to the plurality of linear conductors on the insulating layers;
• forming through holes in the plurality of insulating layers and filling the through holes with conductive paste for the end-surface conductors;
• laminating the plurality of insulating layers and firing them;
• and
• cutting the multilayer body along a line passing through the plurality of end-surface conductor;
• wherein
• a width of each of the end-surface conductors is smaller than a width of the main portions.