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It relates to a converter. 2. Description of the Related Art In recent years, when enjoying music
with an audio device, only the low frequency band of the audio signal from the audio device is
taken out, and this low frequency band signal is converted to vibration (mechanical signal) by a
so-called electro-mechanical conversion device. There is known a bodily sensation sound
apparatus that vibrates a notebook or the like by this vibration. Since this bodily sensation sound
device can enjoy music simultaneously with the ear and the body, it can enjoy music with a sense
of realism, a sense of power and a feeling of double bass. In general, when the frequency is 150
Hz or less, the rate at which the body senses air vibration as sound pressure increases. And if you
sense the sound pressure in both the ear and the body (body), you can feel a real feeling of
double presence. Therefore, as described above, it is a sensational-sound-sensing device that
transmits vibrations synchronized with the low frequency range of the electrical signal of the
speaker to the body through the sheet etc. together with the music. Here, a conventional electromechanical vibration converter used in the above-mentioned body sensation sound apparatus
will be described. Referring to FIG. 1, a ring-shaped permanent magnet 1 is disposed in the
vicinity of the outer periphery of a disk-shaped magnetic yoke 2 having a projection at its central
portion, and a ring-shaped magnetic plate is further formed on the permanent magnet 1. Three
are arranged. An air gap 4 is formed by the projection of the yoke 2 and the grating 3 as shown.
These magnetic yokes 2 ° permanent magnets 1. The magnetic plate 3 and the air gap 4
constitute a magnetic circuit body. The magnetic circuit body is supported by a damper 7 on a
dished case 6b. On the other hand, the coil 5 is disposed in the air gap 4, and the coil 5 is
supported by the case 6a covered by the case 6b. That is, the case 6 is relatively displaceable by
the damper 7. When an audio current flows in the coil 5, a vibration corresponding to the audio
current is generated in the case 6 due to the interaction with the magnetic circuit body. The
conversion method described above is also used for the magnetic drive unit of the speaker, and
has a good single frequency characteristic and a high conversion efficiency. Generally, the
conversion efficiency is determined by the number of turns and the impedance of the coil, and
the gap width is small to increase the conversion efficiency, and the number of turns of the coil is
increased and the winding diameter is increased. There must be. However, since the coil must
move within the air gap without contacting the surroundings, in order to increase the conversion
efficiency, the coil needs to be a fine wire with high density and high roundness. Therefore,
considerable accuracy is required for coil processing and assembly of the conversion device
itself, which results in high cost.
Further, as can be easily understood from FIG. 1, the conventional electro-mechanical transducer
has a problem that the thickness thereof is increased, and the mounting on a sheet is
troublesome. OBJECTS OF THE INVENTION It is an object of the present invention to provide an
electro-mechanical converter which is easy and inexpensive to assemble. Another object of the
present invention is to provide a thin electro-mechanical transducer. According to the present
invention, there is provided a conversion device for converting an electrical signal into
mechanical vibration, comprising: a disc-like magnetic yoke on which is disposed a permanent
magnet wound in a predetermined direction Il; And at least a part of the case is formed of a
magnetic plate, and a permanent magnet in which the coil is wound is disposed on the yoke, and
an outer periphery of the yoke is provided. A spring member is attached, and the yoke is
supported by the case by the spring member. According to the present invention, there is
provided an electric-mechanical vibration converter characterized in that a magnetic circuit is
constituted by the magnetic yoke and the magnetic plate. The present invention will be described
based on examples. First, referring to FIG. 2, the principle of the present invention will be
described. A coil 9 is wound around a U-shaped permanent magnet 8. An iron piece 10 is
disposed to face the magnetic pole of the permanent magnet 8 as shown in the figure, and the
iron piece 10 is fixed via a gap 11. By supplying a voice current to the coil 9, the number of
magnetic fluxes passing through the permanent magnet 8 changes in accordance with the voice
current, and the iron piece 10 vibrates in response to a change in suction force. Next, the first
embodiment will be described with reference to FIGS. 3 (a) and 3 (b). A coil 13 is wound around
the outer periphery of the circular flat permanent magnet 12 magnetized in the thickness
direction (vertical direction in FIG. 3 (b)) as shown. The wound permanent magnet 12 of the coil
13 is disposed and fixed to the dish-shaped magnetic yoke 14 to form a movable body. The outer
surface of the coil 13 is in contact with the inner surface of the magnetic yoke 14. An inner
peripheral surface of a ring-shaped groove 16 is attached to the outer periphery of the yoke 14
so that the inner peripheral surface of the ring 16 abuts, and the outer periphery of the groove
16 is attached to the inner side surface of the case 17. That is, the yoke 14 is supported by the
case 17 so as to be capable of relative displacement 7 'via a ring-shaped spring 16, and is housed
in the case 17. In the case 17, as shown in FIG. 3 (b), a magnetic plate 15 of small magnetic
resistance such as an iron plate is broken. In the above-described electro-mechanical transducer,
a magnetic circuit is constituted by the magnetic yoke 14 and the magnetic stator 15, and when
an audio current flows through the coil 13, a magnetic circuit constituted by the magnetic yoke
14 and the magnetic plate 15. As the magnetic flux of the circuit changes, the attractive force
acting between the magnetic yoke 14 and the magnetic plate 15 changes.
Since the magnetic yoke 14 or the movable body is fixed to the case 17 by a spring, an inertial
force acts on the movable body, so that the case 17 generates a vibration corresponding to the
audio current. In the above-described electro-mechanical transducer, since the change in
magnetic flux is used, the number of coil turns must be increased, and therefore the inductance
becomes large, and the conversion output decreases as the input voltage becomes constant.
However, as described above, since the frequency of the audio signal used in the sensory audio
apparatus is up to about 150 Hz, there is no problem. On the other hand, in the conventional
electrodynamic-type electro-mechanical conversion device, the frequency characteristic is good,
so it is necessary to take out the low frequency component of the audio signal from the speaker
through -H low pass filter. In the conversion device, the conversion device itself can be provided
with a filter function according to the inductance of the coil, the spring constant, etc. 2 Therefore,
the low pass filter conventionally required can be omitted. In the second aspect of the present
invention, as is apparent from the above, the processing of the coil is easy as described above, so
that the assembly of the coil is simple, so that an inexpensive electro-mechanical conversion
device can be obtained. Since the thickness of the body is determined approximately by the
thickness of the permanent magnet, it becomes thinner than before. FIG. 4 shows a second
embodiment of the present invention, in which the case 17 shown in the first embodiment is
omitted and a cut-and-raised portion 15a extending in parallel with the magnetic grating 15 on
the magnetic plate 15 as shown in FIG. The spring attached to the magnetic yoke 14 is fixed to
the cut and raised portion 15a. The end of the magnetic plate 15 is attached to the seat cushion
18 (or vibration transmission plate). In this way, it is possible to reduce the number of parts and
to use it as a magnetic plate diaphragm. FIG. 5 shows the case where the second embodiment
described above is applied to a seat of a car with a so-called lumbar support, and the lambert
plate 19 is used as a magnetic plate and a diaphragm. As described above, according to the
present invention, it is possible to obtain an electro-mechanical transducer which is thinner and
simpler in construction and cheaper than conventional ones.
Brief description of the drawings
FIG. 1 is a cross-sectional view showing a conventional electro-mechanical transducer, FIG. 2 is a
diagram showing the principle of the electro-mechanical transducer according to the present
invention, and FIG. 3 (b) is a sectional view taken along the line A-A 'of FIG. 3 (a), and FIG. 11 is a
partial view of the second embodiment of the present invention. FIG. 5 is a sectional view
showing the case where the second embodiment is applied to a seat note of a car.
1.8.12 · · · Permanent magnet, 2.14 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Dan
yP, 10 · · · iron piece, 11.16 · · spring, 15 · · · magnetic plate. 18・・・ノー1.19・・ランパ
ードブシート。 Figure 1 Figure 4 Figure
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