Title:
ELECTRIC-MECHANICAL-ACOUSTIC TRANSDUCER AND A METHOD OF MANUFACTURING THE SAME
Document Type and Number:
WIPO Patent Application WO/1999/022882
Kind Code:
A1
Abstract:
A high quality electric-mechanical-acoustic transducer used mainly in mobile phones which is not damaged and degraded in performance by drop and impact. The transducer comprises at least one suspension (14) that supports a movable section (19) including a magnetic circuit portion (17) and a weight portion (13), and a frame (9) that supports a vibration plate (8) and the suspension (14) and defines a clearance within an elastic deformation range of the suspension (14) between the frame (9) and the outer circumference of the movable section (19). Even when the mobile terminal drops and the electric-mechanical-acoustic transducer built in it impacts, the suspension (14) can be prevented from being permanently deformed by the frame (9) receiving the outer circumference of the movable section (19).
Inventors:
FUKUYAMA TAKANORI (JP)
Application Number:
PCT/JP1998/004904
Publication Date:
May 14, 1999
Filing Date:
October 29, 1998
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
FUKUYAMA TAKANORI (JP)
FUKUYAMA TAKANORI (JP)
International Classes:
H04R31/00; B06B1/04; G10K9/22; H04M1/03; H04R11/02; B06B1/02; H04R9/06; (IPC1-7): B06B1/00
Foreign References:
| JPH09261917A | 1997-10-03 | |||
| JPH09267075A | 1997-10-14 | |||
| US5107540A | 1992-04-21 | |||
| US5327120A | 1994-07-05 |
Other References:
See also references of EP 0970758A4
Attorney, Agent or Firm:
Iwahashi, Fumio (Ltd. 1006, Oaza Kadoma Kadoma-shi Osaka, JP)
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