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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an example of a
conventional converter, and FIG. 2 is a sectional view showing one embodiment of the present
invention. AE · diaphragm · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · Figure 1 201-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of an electromagnetic type electroacoustic transducer. Conventionally, this type of device is
usually constructed as a first part 0 in the figure, (1) is a magnet, (2) Is a ring, (3) is a wire ring,
(4) is a diaphragm support, (5) is a movable iron plate, (6) is a diaphragm (metal), (7) is a center
ball (magnetic pole)-+81 is a terminal , 9) is the case. The converter of such a configuration
bends the magnetic flux from the magnet (1) and the magnetic flux from the wire ring (3) to the
yoke (2), the center ball (7) and the movable iron plate (5) to form a magnetic circuit Form the
IE1tll board (6). At this time, if the distance between the diaphragm (6) and the center pole (7)
(jlL1, ie, the air gap in the magnetic circuit) is too small, when an excessive input is applied, (1)
the moving plate (6) It may be drawn in contact with the center pole (7) and the magnet (1) as it
is attracted by the direct current magnetic field of the magnet (1). Therefore, the present
invention is intended to eliminate the above-mentioned conventional drawbacks and to improve
the sound pressure level at a specific frequency which is intended for signals (for alarm sound).
An embodiment of the present invention is shown in FIG. 2. In FIG. 3, a wt1 FIG. 3 shows the
same component K as in FIG. In FIG. 2, in the present embodiment, the diaphragm (6) is attached
to the center pole of the imaging plate (6) at a central position to prevent the suction adhesion of
the center pole (7) K by negative stiffness. 7. A slight protrusion (extreme) is formed on the side
opposite to 7) so that the imaging plate (6) tends to be attracted and attached to the center pole
(7) by applying an excessive input. It is made to block using the repulsive force by the collision
with the center pole (7). Therefore, in this case, if the above minute projections are made into an
air gap (2) which collides with the center pole (7) at a certain level of input, the collision noise at
that time causes the noise at the specific frequency. The pressure level is to be increased K. As
described in detail above, in the present invention, even if an excessive input may be applied, the
minute projections on the diaphragm prevent the diaphragm from being attracted to the center
pole, thereby preventing the collision noise at that time. The sound pressure level can be
increased at a certain frequency, and such a useful 1! 'We came to be able to offer cheaply with a
simple configuration that only adds micro projections.
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