Title:
SPEAKER MAGNETIC CIRCUIT AND SPEAKER DRIVER
Document Type and Number:
WIPO Patent Application WO/2022/181316
Kind Code:
A1
Abstract:
A speaker magnetic circuit (11) comprises: a yoke cover (12) formed of a tubular magnetic body and having a diaphragm (33) mounted to one end thereof on one side in an axial direction; a magnet (18) disposed on the inside of the yoke cover (12); a volume adjusting member (14) formed of a tubular non-magnetic body and provided between the yoke cover (12) and the magnet (18), the volume adjusting member (14) having a first groove portion (46A) extending in the axial direction formed therein; and a yoke base (20) formed of a magnetic body and provided on the other side of the magnet (18) in the axial direction, the yoke base (20) having a second groove portion (20A) formed in a position corresponding to the first groove portion (46A), the first groove portion (46A) and the second groove portion (20A) constituting a duct portion (D) communicating between a space on one side in the axial direction and a space on the other side in the axial direction inside the yoke cover (12).
Inventors:
MUTA YUSUKE (JP)
HAN HAIJIAO (JP)
HAN HAIJIAO (JP)
Application Number:
PCT/JP2022/004953
Publication Date:
September 01, 2022
Filing Date:
February 08, 2022
Export Citation:
Assignee:
FOSTER ELECTRIC CO LTD (JP)
International Classes:
H04R9/02
Foreign References:
| JPS5038728U | 1975-04-21 | |||
| JPS58152089U | 1983-10-12 | |||
| JP2006217452A | 2006-08-17 | |||
| JPS4822537U | 1973-03-14 |
Attorney, Agent or Firm:
TAIYO, NAKAJIMA & KATO (JP)
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