Contactless communication medium, antenna pattern-placed medium, communication apparatus, and antenna adjusting method

• US 20110275318A1
• Filed: 04/26/2011
• Published: 11/10/2011
• Est. Priority Date: 05/10/2010
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Sato, Keisuke, Saitoh, Sachio
• Granted Patent: US 8,774,712 B2
• Time in Patent Office: Days
• US Class Current: 455/41.1
• CPC Class Codes: H01Q 1/2208 associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: Y10T 29/49016 Antenna or wave energy "plumbing" making

Abstract

A contactless communication medium includes a base made of an insulating material, an antenna coil section including a conductor wound in a planar shape on the base, an inductance adjusting conductor pattern that is connected in parallel to a part of the conductor in the antenna coil section, and is placed on the base, a capacitor connected to the antenna coil section, and a communication processing section that is connected to the antenna coil section and the capacitor to perform contactless communication processing.

Claims

1. A contactless communication medium comprising:

a base made of an insulating material;

an antenna coil section including a conductor wound in a planar shape on the base;

an inductance adjusting conductor pattern that is connected in parallel to a part of the conductor in the antenna coil section, and is placed on the base;

a capacitor connected to the antenna coil section; and

a communication processing section that is connected to the antenna coil section and the capacitor to perform contactless communication processing.

2. The contactless communication medium according to claim 1,

wherein the adjusting conductor pattern is connected in parallel to a predetermined location of the conductor at an innermost perimeter of the antenna coil section.

3. The contactless communication medium according to claim 2,

wherein the capacitor includes an adjusting capacitor that adjusts an inductance.

4. The contactless communication medium according to claim 3,

wherein the inductance adjusting conductor pattern includes a plurality of conductors connected in parallel to a part of the antenna coil section, and an adjustment to increase an inductance value is made by cutting off some or all of the plurality of conductors partway.

5. The contactless communication medium according to claim 4,

wherein the communication processing section is actuated by electric power received by the antenna coil section and stored in the capacitor.

6. The contactless communication medium according to claim 5, further comprising:

a magnetic sheet that is placed so as to overlap the base, and has a through hole provided at a position where the cutting off is done.

7. An antenna pattern-placed medium comprising:

a base made of an insulating material;

an antenna coil section including a conductor wound in a planar shape on the base; and

an inductance adjusting conductor pattern that is connected in parallel to a part of the conductor in the antenna coil section.

8. A communication apparatus comprising:

a base made of an insulating material;

an antenna coil section including a conductor wound in a planar shape on the base;

an inductance adjusting conductor pattern that is connected in parallel to a part of the conductor in the antenna coil section, and is placed on the base;

a capacitor connected to the antenna coil section; and

a communication processing section that is connected to the antenna coil section and the capacitor to perform contactless communication processing.

9. An antenna adjusting method comprising:

placing an antenna coil section by winding a conductor in a planar shape, on a base made of an insulating material;

connecting an inductance adjusting conductor pattern in parallel to a part of the conductor in the antenna coil section; and

making an adjustment to increase an inductance value by cutting off the inductance adjusting conductor pattern partway.