Title:
スピーカ
Document Type and Number:
Japanese Patent JP4403979
Kind Code:
B2
Abstract:
A speaker includes a magnetic circuit 1 that is formed in the center of a frame 5, a voice coil 6 that is inserted in a magnetic gap of the magnetic circuit 1, a damper 7 that is fixed to the frame 5 and the voice coil 6, and a vibrating plate 8 that is fixed to the frame 5 and the voice coil 6. An opening 10 is provided in a bobbin 12 of the voice coil 6. The area of the opening 10 is 0.3% or less of the radial cross-sectional area of the bobbin 12 of the voice coil 6.
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Inventors:
Kiyoshi Yamagishi
Application Number:
JP2005022421A
Publication Date:
January 27, 2010
Filing Date:
January 31, 2005
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
H04R9/04
Domestic Patent References:
| JP60038077B2 | ||||
| JP11055790A | ||||
| JP56091598A |
Attorney, Agent or Firm:
Fumio Iwahashi
Hiroki Naito
Daisuke Nagano
Hiroki Naito
Daisuke Nagano