Headphone, headphone stand and headphone system

• US 9,008,328 B2
• Filed: 09/28/2012
• Issued: 04/14/2015
• Est. Priority Date: 09/28/2011
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Urano, Takashi, Suzuki, Mitsunari
• Primary Examiner(s): Jamal, Alexander
• Application Number:
  US13/629,670
• Publication Number:
  US 20130223640A1
• Time in Patent Office: 928 Days
• Field of Search: 455/575.2, 307/104, 381/74
• US Class Current: 381/74
• CPC Class Codes: H04R 1/1008 Earpieces of the supra-aural or circum-aural type
• CPC Class Codes: H04R 1/1025 Accumulators or arrangements for charging secondary cells per se H01M10/00; charging in general H02J7/00
• CPC Class Codes: H04R 3/00 Circuits for transducers , loudspeakers or microphones

Abstract

A wireless headphone system 102 includes a headphone 144 and a headphone stand 104. The headphone 144 has two ear cups 150a and 150b. The ear cup 150a incorporates a receiving coil L3 and a capacitor C3. The ear cup 150b incorporates a charge controller 138 and a secondary battery 112. The headphone stand 104 incorporates a feeding coil L2. When the headphone 144 is set in the headphone stand 104, AC power is supplied from the feeding coil L2 to the receiving coil L3, and the secondary battery 112 of the headphone 144 is charged with the AC power.

Claims

1. A headphone comprising:

first and second ear cups,

the first ear cup including a receiving coil wirelessly receiving AC power from an external feeding coil and a capacitor connected to the receiving coil to form therewith a resonance circuit,

the second ear cup including a secondary battery charged with the AC power received by the receiving coil, wherein

the first ear cup includes a magnet and a yoke bonded to the magnet, and

the receiving coil is positioned closer to the ear pad side than the yoke.

2. The headphone according to claim 1, wherein

the second ear cup further includes a DC circuit converting the AC power into DC power.

3. The headphone according to claim 1, further comprising a transmitter transmitting a predetermined signal by wireless.

4. A headphone stand comprising:

a hanging portion for setting a headphone;

first and second feeding coils; and

a power transmission control circuit supplying AC power to the first and second feeding coils to make the first and second feeding coils wirelessly supply the AC power to a receiving coil incorporated in the headphone,

at least one of the first and second feeding coils facing the receiving coil in a state where the headphone is set in the hanging portion, wherein

a transmitter wirelessly transmitting a predetermined signal and the receiving coil are incorporated in one of the two ear cups of the headphone,

the headphone stand further includes first and second receivers which are provided corresponding to the first and second feeding coils, respectively, and receive the signal transmitted from the transmitter; and

the power transmission control circuit supplies the AC power to the feeding coil corresponding to the receiver that has received the signal.

5. The headphone stand according to claim 4, wherein

the receiving coil is incorporated in at least one of two ear cups of the headphone, and

the first and second feeding coils are installed inclined at different angles which correspond respectively to installation angles of the two ear cups.