ANTENNA DEVICE AND ELECTRONIC APPARATUS

• US 20180211150A1
• Filed: 06/28/2016
• Published: 07/26/2018
• Est. Priority Date: 07/22/2015
• Status: Active Grant

• Current Assignee: Dexerials Corporation
• Original Assignee: Dexerials Corporation
• Inventors: ORIHARA, Katsuhisa, SAITO, Norio, KOBO, Masahiro
• Granted Patent: US 10,936,934 B2
• Time in Patent Office: Days
• CPC Class Codes: G06K 19/077 Constructional details, e.g. mounting of circuits in the carrier
• CPC Class Codes: G06K 19/07783 the coil being planar
• CPC Class Codes: H01Q 1/02 Arrangements for de-icing; Arrangements for drying-out ; Arrangements for cooling; Arrangements for preventing corrosion
• CPC Class Codes: H01Q 1/2216 used in interrogator/reader equipment
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 1/243 with built-in antennas
• 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

Abstract

The purpose of the present invention is to ensure satisfactory antenna communication performance even in a case where an antenna coil is placed on the underside of a thermal diffusion sheet. An antenna device (1), incorporated in an electronic apparatus, which communicates with an external device via an electromagnetic field signal, comprising: an antenna coil (12) provided by winding a conducting wire (12a) in a two-dimensional shape and inductively coupled to the external device; and a thermal diffusion sheet (20) provided so as to overlap the antenna coil at a surface of the antenna coil that faces the external device, wherein the thermal diffusion sheet is provided with a slit (18) formed so as to extend from a region overlapping an opening of the antenna coil to an end of the thermal diffusion sheet and a thermal diffusion sheet side opening (19) or slit connected to the slit and formed in the region overlapping the opening of the antenna coil.

Claims

1. An antenna device, incorporated in an electronic apparatus, which communicates with an external device via an electromagnetic field signal, comprising:

an antenna coil provided by winding a conducting wire in a two-dimensional shape and inductively coupled to the external device; and

a thermal diffusion sheet provided so as to overlap the antenna coil at a surface of the antenna coil that faces the external device,

wherein the thermal diffusion sheet is provided with a slit formed so as to extend from a region overlapping an opening of the antenna coil to an end of the thermal diffusion sheet and a thermal diffusion sheet side opening or slit connected to the slit and formed in the region overlapping the opening of the antenna coil.

2. The antenna device according to claim 1, wherein the thermal diffusion sheet side slit connected to the slit is formed so as to extend along an inner shape of the opening of the antenna coil.

3. The antenna device according to claim 1, further comprising, on one surface of the thermal diffusion sheet, a metallic sheet formed with at least parts of the slit and the thermal diffusion sheet side slit bored therethrough.

4. The antenna device according to claim 2, further comprising, on one surface of the thermal diffusion sheet, a metallic sheet formed with at least parts of the slit and the thermal diffusion sheet side slit bored therethrough.

5. The antenna device according to claim 2, wherein the opening of the antenna coil is rectangular, and

the thermal diffusion sheet side slit is formed so as to extend along three sides of the inner shape of the opening.

6. The antenna device according to claim 3, wherein the opening of the antenna coil is rectangular, and

the thermal diffusion sheet side slit is formed so as to extend along three sides of the inner shape of the opening.

7. The antenna device according to claim 4, wherein the opening of the antenna coil is rectangular, and

the thermal diffusion sheet side slit is formed so as to extend along three sides of the inner shape of the opening.

8. The antenna device according to claim 2, wherein the opening of the antenna coil is rectangular, and

the thermal diffusion sheet side slit is formed so as to extend along four sides of the inner shape of the opening.

9. The antenna device according to claim 3, wherein the opening of the antenna coil is rectangular, and

the thermal diffusion sheet side slit is formed so as to extend along four sides of the inner shape of the opening.

10. The antenna device according to claim 4, wherein the opening of the antenna coil is rectangular, and

the thermal diffusion sheet side slit is formed so as to extend along four sides of the inner shape of the opening.

11. The antenna device according to claim 1, wherein the thermal diffusion sheet is formed from graphite.

12. The antenna device according to claim 2, wherein the thermal diffusion sheet is formed from graphite.

13. The antenna device according to claim 3, wherein the thermal diffusion sheet is formed from graphite.

14. The antenna device according to claim 4, wherein the thermal diffusion sheet is formed from graphite.

15. The antenna device according to claim 5, wherein the thermal diffusion sheet is formed from graphite.

16. The antenna device according to claim 6, wherein the thermal diffusion sheet is formed from graphite.

17. The antenna device according to claim 7, wherein the thermal diffusion sheet is formed from graphite.

18. The antenna device according to claim 8, wherein the thermal diffusion sheet is formed from graphite.

19. The antenna device according to claim 9, wherein the thermal diffusion sheet is formed from graphite.

20. An electronic apparatus that is able to communicate with an external device via an electromagnetic field signal, comprising the antenna device according to claim 1.