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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an example of a
conventional electromagnetic electroacoustic transducer, FIG. 2 is a cross-sectional view showing
a first embodiment of the present invention, and FIG. FIG. 4 is a block diagram of the main part
showing the second embodiment, and FIG. 5 is a block diagram of the main part showing the
third embodiment. Y, E, E, E,.. Fig. 1 /-197-J-P 50-153947 (2) Fig. 2 Fig. 3 56, "/ 0 I 0 / / 0 Fig. 4
5/2/212 Fig. 5/4 / t) / 4- 198-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of an electromagnetic electroacoustic transducer. Conventionally, such a device is usually
constructed as shown in FIG. In the figure, (1) is a magnet, (2) is a yoke, (3) is a wire ring, (4) is a
diaphragm support, (5) is a movable iron plate, (6) is a swing, one plate (metal) , (7) is a magnetic
pole (center pole)-+ 8) is a terminal, and (9) is a case. The electromagnetic type electric sound IIP
converter of such a configuration has the magnetic flux from the magnet (1) and the magnetic
flux from the wire ring (3) through the yoke (2), the magnetic pole (7) and the movable iron plate
(5) Form and vibrate the diaphragm. By the way, although the diaphragm (6) and the movable
iron plate (5) have their central portions spot-welded together (1), they are also bonded and
integrated, and the diaphragm (·) and the movable iron plate (5 And the movable iron plate (5)
both vibrate in substantially the same way during vibration, and 1) the two collide with each
other. There were few outbreaks. Therefore, the present invention can be made using the valence
noise of a diaphragm and a movable iron plate especially for the purpose of generating an alarm
sound. It is an object of the present invention to provide a very compact electromagnetic
electroacoustic transducer capable of generating extremely loud sounds. Next, each m
embodiment of the present invention is shown! In the example of the actual design example,
Figure 1 Same as 4 /! The same reference numerals are given to the binding components and the
explanation thereof is omitted. FIGS. S and 8 show a first embodiment of the present invention,
wherein the movable iron plate (5) has a dowel shape at a plurality of locations including the
movable iron plate central portion on the side facing the diaphragm (6) K (6 m). The protrusion
(至) is made to project, and the diaphragm (6) and the movable iron plate (5) are spot-melted
through the protrusion (2) located at the center part of the above-mentioned protuberances and
projections. I(111させている。 Therefore, when the diaphragm (6) and the movable iron
plate (5) vibrate, at a particular (2) frequency, the other projections except the central portion
collide with the pregnant Increase sound pressure level and generate loud noise as alarm sound.
FIG. 4 shows a second embodiment, in which the diaphragm <6) is opposed to the movable iron
plate (5) at a plurality of locations including the central portion of the diaphragm (6) on the side
(. 畠) side. The protrusion @-is formed to protrude, and the protrusion 2 of the central portion is
formed by moving the movable iron plate (5) K spot welding U, and the working principle is the
same as that of the first embodiment. Further, in the third embodiment of FIG. 5, while spot
welding is carried out with the projection 06 at the central portion in FIG. 2, spot welding I is
carried out via a projection (d) at an eccentric position. By changing the welding point in this
manner, the frequency at which the sound pressure increases can be arbitrarily changed.
In the above examples, an example was shown in which either the facing surface (6 哀) of the
moving plate (6) or the movable iron plate (6), (6a) K protrusion ((), Qm were provided. It is also
possible to provide on both opposing surfaces (@a) a (6 m). (3) As described in detail above,
according to the present invention, it is possible to obtain a loud sound for alarm sound, and to
provide an inexpensive surface electromagnetic type electroacoustic transducer having a simple
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