ANTENNA SHEET FOR NON-CONTACT CHARGING DEVICE AND CHARGING DEVICE USING THE ANTENNA SHEET

• US 20150097521A1
• Filed: 05/14/2013
• Published: 04/09/2015
• Est. Priority Date: 05/14/2012
• Status: Abandoned Application

• Current Assignee: Hitachi Chemical Company Limited (Resonac Holdings Corp.)
• Original Assignee: Hitachi Chemical Company Limited (Resonac Holdings Corp.)
• Inventors: Endou, Toshihiro, Kobayashi, Kazuhito, Oota, Masahiko
• Application Number:
  US14/401,179
• Publication Number:
  US 20150097521A1
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H01F 27/24 Magnetic cores
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles
• CPC Class Codes: H01Q 7/06 with core of ferromagnetic material H01Q7/02 takes precedence
• CPC Class Codes: H01Q 9/14 Length of element or elements adjustable telescopic elements H01Q1/10
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields

Abstract

Provided are an antenna sheet for a non-contact charging device and a charging device using the antenna sheet. The antenna sheet is configured to allow for a high degree of freedom in respect of arrangement of a transmitting side and a receiving side during power charging. The antenna sheet is an antenna sheet for a non-contact charging device, and is usable as a transmitting-side resonator for a transmitting-side device or a receiving-side resonator for a receiving-side device. The antenna sheet comprises: a substrate; and a coil-shaped antenna formed on the substrate, wherein the coil-shaped antenna is configured to function as a pickup coil operable to resonate at a resonant frequency f, when a resonance capacitor is set to have a capacitance C. The resonant frequency (f) is 13.56 MHz, the transmitting-side resonator comprises a resonance capacitor having a capacitance of 1 to 5 pF, and the receiving-side resonator comprises a resonance capacitor having a capacitance of 70 to 100 pF.

Claims

1. An antenna sheet for a non-contact charging device, usable as a transmitting-side resonator for a transmitting-side device or a receiving-side resonator for a receiving-side device, comprising:

a substrate; and

a coil-shaped antenna formed on the substrate, the coil-shaped antenna being configured to function as a pickup coil operable to resonate at a resonant frequency f, when a resonance capacitor is set to have a capacitance C.

2. The antenna sheet as defined in claim 1, wherein the resonant frequency f is 13.56 MHz, the transmitting-side resonator comprises a resonance capacitor having a capacitance of 1 to 5 pF, and the receiving-side resonator comprises a resonance capacitor having a capacitance of 70 to 100 pF.

3. The antenna sheet as defined in claim 1, wherein the resonant frequency f is 6.78 MHz, the transmitting-side resonator comprises a resonance capacitor having a capacitance of 8 to 20 pF, and the receiving-side resonator comprises a resonance capacitor having a capacitance of 70 to 120 pF.

4. The antenna sheet as defined in claim 2, wherein the substrate of the antenna sheet used as the receiving-side resonator comprise a magnetic sheet glued by an adhesive on the opposite side of the antenna formed.

5. The antenna sheet as defined in claim 4, wherein the magnetic sheet is glued on the substrate in such a manner as to cover an outer periphery of the coil-shaped antenna.

6. The antenna sheet as defined in claim 4, wherein the magnetic sheet has a hollowed-out annular shape in accordance with a shape of the coil-shaped antenna.

7. The antenna sheet as defined in claim 4, wherein the layer of the magnetic sheet has a thickness of 10 to 500 μ

m.

8. The antenna sheet as defined in claim 4, comprising an externally-connected terminal penetrating through the substrate and projecting from a hole created in the magnetic sheet and the adhesive.

9. A non-contact charging device comprising:

a transmitting-side antenna sheet obtained by adhering a first substrate on a first magnetic sheet with an adhesive, forming a resonance coil on the first substrate, and burying a feed coil in the adhesive; and

a receiving-side antenna sheet obtained by adhering a second substrate on a second magnetic sheet with an adhesive, and forming a reception coil on the second substrate.

10. The non-contact charging device as defined in claim 9, wherein each of the resonance coil and the reception coil has a resonant frequency of 13.56 MHz, the transmitting-side antenna sheet comprises a resonance capacitor having a capacitance of 1 to 5 pF, and the receiving-side antenna sheet comprises a resonance capacitor having a capacitance of 70 to 100 pF.

11. The non-contact charging device as defined in claim 9, wherein each of the resonance coil and the reception coil has a resonant frequency of 6.78 MHz, the transmitting-side antenna sheet comprises a resonance capacitor having a capacitance of 8 to 20 pF, and the receiving-side antenna sheet comprises a resonance capacitor having a capacitance of 70 to 120 pF.

12. The non-contact charging device as defined in claim 9, wherein the second magnetic sheet is glued on the second substrate in such a manner as to cover an outer periphery of the coil-shaped antenna.

13. The non-contact charging device as defined in claim 9, wherein the second magnetic sheet has a hollowed-out annular shape in accordance with a shape of the coil-shaped antenna.

14. The non-contact charging device as defined in claim 10, wherein the layer of the second magnetic sheet has a thickness of 10 to 500 μ

m.

15. The non-contact charging device as defined in claim 9, comprising an externally-connected terminal projecting from a hole created in the first magnetic sheet and the adhesive.