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2, inventor Morita Shigel Name Mori 1) Shige (other 2 people) 5u1i4587 [phase] Japan Patent
Office ■ JP-A-52-389150 Published Japan. (1977) 3.25 examination request unclaimed (all
three pages) Office serial number number specification name of invention
Electro-acoustic transducer
3. Detailed Description of the Invention The present invention relates to an electroacoustic
transducer such as a flat dynamic speaker and a headphone utilizing film vibration. This type of
electro-acoustic transducer has the advantage that the vibrating membrane vibrates with a
uniform surface phase on its full force movable surface, but the conventional one is as shown in
FIG. 1 with respect to the vibrating membrane. Magnetic circuit consisting of a permanent
magnet (L) and a magnetic material plate (8) magnetized in the thickness direction (direction AA
in FIG. 1) on both sides of the vibrating membrane (4). It is configured to obtain various direct
current magnetic fluxes to be orthogonal to the conductor (5) fixed to the rod, but because the
configuration of the magnetic circuit is not appropriate and can not be used efficiently, it uses It
has the disadvantage of being expensive. In FIG. 1, (8) is a magnetic plate, and (6) is an opening
provided in the magnetic plate. The present invention has been made to solve the abovementioned drawbacks, and a convex magnetic material is embedded between the magnets facing
each other with the same polarity, and it occurs between the ends of the spread parts of the
adjacent convex magnetic materials. The efficiency is improved by concentrating the leakage flux
in the space on the diaphragm / conductor on the top. It provides an excellent electroacoustic
transducer. The present invention will be described in detail according to the illustrated
embodiment. EndPage: FIGS. 2 and 3 are a front view and a longitudinal sectional view showing
one embodiment of the electroacoustic transducer according to the present invention, and FIG. 4
is a longitudinal sectional view showing an essential part of FIG. 1) permanent magnet, 0) a
magnetic material having a convex cross section, (8) a plate made of a magnetic material for
forming a magnetic circuit, (荀 is a vibrating film, (5) is a vibrating film (fixed in season) (6) is an
opening for emitting sound, (g) is a diaphragm fixing material, and (8) is a nonmagnetic material
plate. In the magnetic circuit thus expanded, as shown in FIG. 4, the convex portion between the
end of the pole piece of the wide portion of the convex magnetic material (2N) between the
adjacent and facing N poles shown in FIG. Leakage flux is uniformly and intensively generated in
an arc shape toward the magnetic pole piece of the magnetic material (2S), and the number of
magnetic fluxes interlinked with the signal line (6) greatly increases compared to the
conventional method and formula Because of the improved efficiency, it is necessary to use highquality nodal magnets. As shown in FIG. 2, the conductors (6) for signal rods are alternately set in
the opposite direction, and are disposed in a meandering manner between the ends of the pole
pieces of adjacent convex magnetic members (2). When a signal current is applied to the signal
line (5), the entire vibrating portion of the vibrating membrane (4) vibrates in the same direction.
In addition, one side of this magnetic circuit embeds a magnetic material ω) having a large
number of openings (6) between different poles of adjacent magnets to construct a magnetic
circuit. The sound pressure generated by the vibrating membrane (4) is radiated to the outside of
the magnetic circuit having this opening (6).
In the above embodiment, although the strip-shaped magnets are arranged in parallel, it is
natural that the configuration of the magnetic circuit is not limited to linear and can be any
shape, and the opening for sound radiation is Even if it is provided not only on one side but also
on both sides, as described above-0 or more, the present invention uses a convex magnetic
material between the opposing same poles of the magnet of the plate-like electroacoustic
transducer. The efficiency of the electroacoustic transducer is improved and the price thereof is
reduced by arranging the magnetic fluxes' linked to the signal lines to be concentrated on the
signal line portion efficiently and uniformly.
4. Brief description of the drawings. FIG. 1 is a longitudinal sectional view showing a
conventional flat plate type electroacoustic transducer, and FIG. 2 is an example of an
electroacoustic transducer according to the present invention, a front view showing a part of FIG.
3 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 4 is
a sectional view showing the main part of FIG. In the figure, the same reference numerals
indicate the same or identical parts, (1) is a strip of permanent magnet%, the magnetic material%
(8) is a magnetic material plate for forming a magnetic circuit, Is a diaphragm, (5) is a conductor
for signal lines, (6) is an opening for emitting sound, (g) is a diaphragm fixing material, (8) is a
nonmagnetic plate, (9) is a large number of openings. It is a magnetic material which it has.
Agent Patent Attorney Shinno Kuwano-Th (4) Fig. 1 Fig. 2 End Page: 2 Fig. 3 Fig. 4 Fig. 4 Fig. 4
Fig. 4 Inventors other than the above (1) Inventor -Mitsubishi Electric Co., Ltd. Sagami
Seisakusho Name Mami Maki Mio Ulsan Address: EndPage: 3