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JPS50153946

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DESCRIPTION JPS50153946
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross sectional view showing an example of a
conventional electromagnetic electroacoustic transducer, and FIG. 2 is a cross sectional view
showing one embodiment of the present invention. AE и Shake E и Case, 10 и и и и и и и и и и и и и и и и и и и и и
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и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и small
projections. Fig. 2-195-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of the electromagnetic type electric noise 41f converter. Conventionally, such a device is usually
constructed as shown in FIG. In FIG. 1, (1) is a magnet, (2) is a yoke, (3) is a wire ring, (4) is a
ff1111 plate support, (5) is a movable iron plate, (6) is an imaging plate (metal) + (7) is a center
ball (magnetic pole 1, (8) is a terminal, (9) is a case. In such an electromagnetic type acoustic
transducer, the magnetic flux from the magnet (1) and the magnetic flux from the wire ring (3)
pass through the yoke (2), the center ball (7) and the movable iron plate (5) to form a magnetic
circuit If the distance between the pregnancy plate (6) and the center ball (7) (sometimes, the air
gap in the magnetic circuit) is too small, When an excessive input is applied, the diaphragm (6)
comes in contact with the center ball (7) (1) and the magnet (1), and the center pole (7) K is
attracted by the direct current magnetic field of the magnet (1). It may be done. That is, in order
to raise the output sound pressure level, it is necessary to make the air gap as small as possible,
but this increases the possibility of the suction phenomenon of the diaphragm (6) to occur. It is
intended to improve the sound pressure level at a specific frequency that is improved and for
signals (for alarm sound). An embodiment of the present invention is shown in FIG. In FIG. 2, the
same components as those shown in FIG. 1 are denoted by the same reference numerals, and the
description thereof is omitted. In the embodiment of FIG. 2, in order to prevent the diaphragm (6)
from being attracted to the center ball (7) by negative stiffness, K, an annular minute projection
on the upper end surface of the center ball (7) of the magnetic circuit. (Or a minute projection
03-05-2019
1
divided into a plurality of parts) is provided. Therefore, even if the diaphragm (6) is attached to
the center ball (7) by suction due to excessive input, the diaphragm (6) (6) 2) can prevent the
center pool (7) K suction attached. Also, if the air gap is formed such that the diaphragm (6)
collides with the minute projection C11 at the time of input, the sound pressure level is increased
at a specific frequency formed by the collision sound at that time. It is possible. As described
above in detail, according to the present invention, even when an excessive input is applied, the
presence of the minute projections provided against the diaphragm prevents the diaphragm from
being attracted to the center pole. The sound pressure level can be increased at a specific wJ
wave number which can be + L or at the time of the collision sound, and it is simple to add such a
useful electromagnetic electroacoustic transducer with a microprotrusion It came to offer it
cheaply because of its configuration.
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