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May 27, 1975 Flat panel type electroacoustic transducer 3, patent applicant ■ Japan Patent
Office ■ Japanese Patent Application Laid-Open No. 5l-z 3s 4x 70 Japanese Patent Application
No. 51. (1976) 11.25. Japanese Patent Application No. Sho. [Phase] filing date date, (197, j;), 5
'"'", λ is the specification 1, title of the invention
Flat plate type electroacoustic transducer
3. Detailed Description of the Invention The present invention relates to a flat plate type
electroacoustic transducer, and more particularly to an improvement of a flat plate type
electroacoustic transducer which facilitates the manufacture of its magnetic circuit. 0
Conventional flat plate type electricity The acoustic transducer had a structure as shown in its
basic cross section in FIG. That is, 1 is a flat plate with high permeability, 2 唸 permanent
magnet, 3 is an acoustic transmission hole formed in the flat plate 1, 4 is a diaphragm, 5 is an
audio current path printed on the diaphragm 4. For example, when an audio signal is supplied to
the audio current path 5, the diaphragm is operated according to the change of the audio current
by the action of the magnetic circuit constituted by the two permanent magnets 2 and the flat
plate 1 interposed therebetween. The driving force to vibrate the diaphragm 4 becomes large if a
magnetic field is applied from both sides of the diaphragm 40 (from the upper and lower sides in
FIG. 1) to the 0 audio current path 5 where the driving force to vibrate 4 is obtained 2 shows a
magnetic circuit on one side of the diaphragm 4 as shown by the slanted EndPage: 1, but
adjacent permanent magnets are SN, Is. It must be magnetized alternately in reverse phase with
8N o Or the magnetized magnet must be alternately attached to the flat plate l so that the
directions of the magnetic poles are reversed. In any case, manufacturing becomes complicated.
Flat plate type electroacoustic transducer
The present invention is intended to provide a flat plate type electroacoustic transducer having a
structure that does not require complicated processes for producing such a magnetic circuit.
Details of the present invention will be described according to FIG. 3 showing one embodiment
below. Explain. The same parts are denoted by the same reference numerals as in FIG. 1 and FIG.
2, and 06 is a temporary magnet such as a laminated directional boron steel plate. 2 and the
temporary magnets 6 are alternately arranged, and thereafter the whole is magnetized in the
direction perpendicular to the flat plate 1. The permanent magnet 2 is magnetized in the same
direction by this magnetizing step, but the temporary magnet 6 disposed between the permanent
magnets 20 removes the external magnetic field and simultaneously with the permanent magnet
2 by the magnetic field of the permanent magnet 2. It acts as a magnet magnetized in the reverse
phase, and forms a magnetic circuit together with the permanent magnet 2 and the flat plate 1 to
apply a magnetic field to the audio current path 5. Of course, only the permanent magnet
material may be disposed first in a flat plate and magnetized to obtain the permanent magnet 2
and then the temporary magnet 6 may be disposed between the permanent magnets 20. In this
case, the temporary magnet 6 is If the directional magnetic material 7 is disposed on the upper
part of the permanent magnet 2 as shown in FIG. 4 which is attracted to the flat plate 1 and
easily fixed, external leakage of the magnetic circuit can be reduced. As described above,
according to the present invention, the permanent magnet can be easily magnetized and the
manufacturing process can be simplified. Also, it is possible to use a directional magnetic
material. In this case, the magnetic gap of the magnetic circuit It is possible to give a uniform
magnetic field to the diaphragm as it can reduce the leakage to the other and expand the
horizontal magnetic field (the magnetic field in the plane of the diaphragm).
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view showing the basic structure
of a conventional flat plate type electroacoustic transducer, and FIG. 2 is a perspective view
showing a magnetic circuit located below the diaphragm 4 of FIG. Fig. 3 is a sectional view
showing the basic structure of a flat plate type electroacoustic transducer according to the
present invention, and Fig. 24 is a simplified sectional view showing another embodiment of the
present invention. 2 Permanent magnet 3 Acoustic transmission hole 4---Diaphragm 5 Audio
current path 6 ... Temporary magnet 特許 Patent applicant Pioneer Corporation: (5) Fig. 1 Fig. 4Jllllllllll EndPage: 25; Inventors other than the above ^ SUZUKI PIONEER CO., LTD. Place II
Shimeto Toshi Name Yoshi 1) Deng EndPage:3
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