Title:
内磁型磁気回路及びスピーカ装置
Document Type and Number:
Japanese Patent JP4073717
Kind Code:
B2
Abstract:
An internal magnetic circuit is formed by a plate (20) forming a pole piece, a vertically magnetized magnet (21) attached to a bottom face of the plate, and a yoke (22) attached to a bottom face of the magnet. A magnetic gap (G0) is formed between the plate and the yoke. The yoke includes a bottom part (22b) attached to the bottom face of the magnet, a side part (22c) standing on the side of the plate, and a folded-back part(22d) folding downwards over the side part to face the magnetic gap. Thus, the internal magnetic circuit having a uniform magnetic flux density inside the magnetic gap along the direction of its length is provided.
Inventors:
Hiroyuki Kobayashi
Toi Hiroyuki
Shoichiro Terauchi
Takashi Oyaba
Toi Hiroyuki
Shoichiro Terauchi
Takashi Oyaba
Application Number:
JP2002178329A
Publication Date:
April 09, 2008
Filing Date:
June 19, 2002
Export Citation:
Assignee:
Pioneer Corporation
Tohoku Pioneer Co., Ltd.
Tohoku Pioneer Co., Ltd.
International Classes:
H04R9/02; H04R9/06
Domestic Patent References:
| JP5137196A |
Attorney, Agent or Firm:
Nobujun Kobashi