Battery apparatus for charging portable device

• US 20020041176A1
• Filed: 09/25/2001
• Published: 04/11/2002
• Est. Priority Date: 09/29/2000
• Status: Abandoned Application

• Current Assignee: Toko KK
• Original Assignee: Toko KK
• Inventors: Eki, Yutaka
• Application Number:
  US09/961,410
• Publication Number:
  US 20020041176A1
• Time in Patent Office: Days
• US Class Current: 320/109
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence
• CPC Class Codes: H02J 7/0045 concerning the insertion or the connection of the batteries

Abstract

A battery apparatus for charging a portable device, including: a first coil which a current is supplied to, the first coil being mounted in a first case; and a second coil, which power from the first coil is transmitted to, the second coil being mounted in a second case; the second coil comprising an air-core coil, the inside diameter of the winding of the air-core coil being greater than the inside diameter of the winding of the first coil, and the first coil and second coil being arranged so that winding faces thereof are opposite each other.

Claims

1. A battery apparatus for charging portable device, comprising:

a first coil which a current is supplied to, said fist coil being mounted in a first case; and

a second coil, which power from said first coil is transmitted to, the second coil being mounted in a second case;

said second coil comprising an air-core coil, the inside diameter of the winding of said air-core coil being greater than the inside diameter of the winding of said first coil, and said first coil and second coil being arranged so that winding faces thereof are opposite each other.

2. The battery apparatus for charging a portable device according to claim 1, wherein the inside diameter of the winding of said second coil is greater than the inside diameter of the winding of said first coil, and the outside diameter of the winding of said second coil is substantially equal to the outside diameter of the winding of said first coil.

3. The battery apparatus for charging a portable device according to claim 1 or 2, wherein the inside diameter of the winding of said second coil is determined in consideration of the thickness of cases on the charging side and charged side and distribution of magnetic flux with respect to said first coil.

4. The batter apparatus for charging a portable device according to any one of claims 1 to 3, said first coil and said second coil comprise air-core coil;

made from self-bonding wire.