PORTABLE APPARATUS AND FEED SYSTEM

• US 20130249312A1
• Filed: 05/23/2013
• Published: 09/26/2013
• Est. Priority Date: 11/29/2010
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Uchida, Akiyoshi, TAGUCHI, MASAKAZU, SHIMOKAWA, SATOSHI, Matsui, Kiyoto, KAWANO, Hiroyasu
• Granted Patent: US 9,362,985 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: G06K 7/10178 including auxiliary means for focusing, repeating or boosting the electromagnetic interrogation field comparable booster antennas integrated on the record carrier itself G06K19/07794
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/366 made of ferromagnetic material
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• 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
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A portable apparatus includes a case, a coil situated inside the case, a circuit disposed inside the case to receive power based on a first frequency via the coil and to perform communication based on a second frequency higher than the first frequency, and a magnetic shield having a first portion and a second portion stacked one over another in a direction perpendicular to the coil between the coil and an inside of the case, the second portion being closer to the coil than the first portion, wherein permeability of the first portion is higher than permeability of the second portion situated toward the coil with respect to the first frequency.

Claims

1. A portable apparatus, comprising:

a case;

a coil situated inside the case;

a circuit disposed inside the case to receive power based on a first frequency via the coil and to perform communication based on a second frequency higher than the first frequency; and

a magnetic shield having a first portion and a second portion stacked one over another in a direction perpendicular to the coil between the coil and an inside of the case, the second portion being closer to the coil than the first portion,

wherein permeability of the first portion is higher than permeability of the second portion situated toward the coil with respect to the first frequency.

2. The portable apparatus as claimed in claim 1, wherein the coil is a single coil, or includes two coils that are disposed to overlap each other at least partially.

3. The portable apparatus as claimed in claim 1, wherein the magnetic shield includes:

a first shield situated towards the inside of the case and serving as the first portion; and

a second shield situated towards the coil and serving as the second portion,

wherein permeability of the first shield is higher than permeability of the second shield at the first frequency.

4. The portable apparatus as claimed in claim 1, wherein permeability of the first portion is higher than permeability of the second portion with respect to the second frequency.

5. A feed system, comprising:

a power transmission apparatus; and

a portable apparatus to which power is transmitted via magnetism from the power transmission apparatus,

wherein the portable apparatus includes;

a case;

a coil situated inside the case;

a circuit disposed inside the case to receive power based on a first frequency from the power transmission apparatus via the coil and to perform communication based on a second frequency higher than the first frequency; and

a magnetic shield having a first portion and a second portion stacked one over another in a direction perpendicular to the coil between the coil and an inside of the case, the second portion being closer to the coil than the first portion,

wherein permeability of the first portion is higher than permeability of the second portion with respect to the first frequency.

6. The feed system as claimed in claim 5, wherein the coil is a single coil, or includes two coils that are disposed to overlap each other at least partially.

7. The feed system as claimed in claim 5, wherein the magnetic shield includes:

a first shield situated towards the inside of the case and serving as the first portion; and

a second shield situated towards the coil and serving as the second portion,

wherein permeability of the first shield is higher than permeability of the second shield at the first frequency.

8. The feed system as claimed in claim 5, wherein permeability of the first portion is higher than permeability of the second portion with respect to the second frequency.