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JPS6129297

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DESCRIPTION JPS6129297
[0001]
TECHNICAL FIELD The present invention relates to an electric vibration converter, and in
particular, an electric vibration conversion mJy-A-tote-background technology used as a vibration
source of a sensational acoustic vibration device is a sound device that transmits musical tones
by air propagation like a speaker. Not only the effect, but also the bass in the audible range and
lower range is converted into the mechanical vibration of the contacting member of the human
body by the special electric vibration converter and it is rich in presence by directly feeling it It
gives the listener a feeling. Various specific configurations of the electric vibration converter
have been proposed, and in the O diagram which is shown in FIG. 1 as one example thereof,
reference numeral 1 indicates the whole of the electric vibration converter. The electric vibration
converter is provided with a case 4 as a housing formed by combining two members 2 and 3
respectively formed in a bowl shape and a plate shape using resin or the like as a material. An
annular magnet 5 is disposed in the case 4 and is attached to the inner wall surface of the case 4
via a damper 6 formed of a plate spring or the like. Annular yoke plates 7 and yokes 8
constituting a magnetic circuit together with the annular magnet are concentrically fixed to the
upper and lower surfaces of the annular magnet 5, respectively. A pole portion 8? is
protrusively provided at the axial center of the yoke 8. The pole portion forms a magnetic gap 9
together with the annular magnet 5 and the annular yoke plate 7. A cylindrical bobbin 10 is
inserted into the magnetic gap 9) and fixed to a plate-like member 3 which is a part of the case 4.
A voice coil 11 is wound around the outer periphery of the bobbin 10. Note that, as shown in
FIGS. 2 and 3, the electric vibration converter 1 is usually attached to a vibration transmitting
member 15 formed of a bending-formed diaphragm 13 and a frame 14, and further, for example,
as shown in FIGS. Attached to a frame member such as a chair (not shown) and used. Further, as
shown in FIGS. 4 and 5 as well as in FIGS. 6 and 7, the electric vibration converter 1 is mounted
on the vibration transmitting member 18 formed in the rectangular plate-like diaphragm 17 or
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the miso-shaped steel shape. It is also possible to attach and embed it in the seat or back of the
chair. In the electric vibration converter having such a configuration, the vibration of the case 4
(first illustration) is transmitted to the human body through the various diaphragms and the
cushion members of the chair. By the way, in order to vibrate the case 4 effectively, it is
necessary to increase the mass of the magnetic circuit reciprocally oscillating with respect to the
case and further increase the stiffness of the damper 6 which supports the magnetic circuit in a
freely vibrating manner.
However, the resonance kurtosis at the low resonance frequency: fo: Qo, where k flLo: equivalent
mass of the magnetic circuit So: equivalent stiffness of the damper ?. Equivalent resistance A:
Force coefficient Rv: Expressed as voice coil direct current resistance. Therefore, as described
above, the equivalent mass of the magnetic circuit: info. And equivalent stiffness of damper 6: S.
There is a problem that the resonance kurtosis: the increase of Qo is caused by increasing the
size. SUMMARY OF THE INVENTION The present invention has been made in view of the abovedescribed point, and its object is to have a flat frequency characteristic, and thus, for example, an
electric vibration converter capable of obtaining a sufficiently wide effective band. To provide.
The electric vibration converter according to the present invention comprises a magnetic circuit,
a voice coil inserted in a magnetic gap formed in the magnetic circuit, and the magnetic circuit
and the voice coil surrounding the sight circuit and the voice coil. And a housing which holds one
of the housings and vibratably supports the other, and is characterized in that the sub-vibration
body is attached to the housing through an elastic member. Embodiments of the present
invention will now be described with reference to the accompanying drawings. FIG. 8 shows the
main part of a body-sensitive acoustic vibration apparatus including an electric vibration
converter as a first embodiment of the present invention. In addition, although not illustrated as a
whole, the said bodily sensation acoustic vibration apparatus is manufactured, for example in a
chair type. As shown in FIG. 8, the seat portion of the chair-type somatoacoustic vibrating device
is provided with a frame member 21 as a pivot supporting the body pressure. A vibration
transmission member 22 formed in, for example, a miso-shaped steel shape is attached to the
frame member 21 via an incisor 23. A cushion member 24 is provided on the vibration transfer
member 22. A pair of electric vibration converters 1 is fixed to the lower surface of the vibration
transfer member 22. The electric vibration converter 1 has been described in detail with
reference to FIG. 1, so the description thereof is omitted here, and the same applies to the
embodiments described below. A weight 25 as a sub-oscillator is attached to the case 4 of the
electric vibration converter 1 via an elastic member 26. Although the vibration of the case 4 is
transmitted to the human body via the vibration transmitting member 22 and the cushion
member 24 in the body-sensing acoustic vibration apparatus configured as described above, the
weight 25 and the elastic member 26 are used as the case 24 vibrates. So-called dynamic
vibration absorption is performed. Therefore, as shown by the solid line 28 in FIG. 9, the bass
resonance frequency: "resonance kurtosis at the fo" Qo can be suppressed low.
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The frequency characteristic shown by the solid line 29 in FIG. 9 is the case where the weight 25
and the elastic member 26 are not provided. FIG. 10 shows an electric vibration converter as a
second embodiment of the present invention. In the electric vibration converter of the first
embodiment shown in FIG. 8, a single weight 25 is installed between two electric vibration
converters, while the electric vibration of this second embodiment is In the converter, weights 25
and elastic members 26 are individually provided on the case main surface of one electric
vibration converter 1. By configuring in this manner, setting of the mass of the weight 25 as an
auxiliary vibrator and the stiffness of the elastic member 26 is facilitated. Also, an electric
vibration converter including the weight 25 and the elastic member 26 as compared with the
electric vibration converter according to the first embodiment in which the elastic member 26 is
formed in a flat plate shape and the elastic member is cylindrical. The reduction in size, in
particular the reduction in thickness, is facilitated in FIG. In the electric vibration converter, a
visco-elastic body such as rubber is used as a material of the elastic member 26. The use of a
relatively easy-to-form and inexpensive viscoelastic body as a material of the elastic member 26
enables cost reduction. Further, the elastic member 26 is not limited to one completely formed in
a flat plate shape as shown in FIG. 10, but as shown in FIG. 11, even if an annular elastic member
26 subjected to light removal is used. An effect equivalent to that of the electrical vibration
converter of FIG. 10 can be obtained. FIG. 12 shows an electric vibration converter as a third
embodiment of the present invention. In the electric vibration converter of the first and second
embodiments, the weight 25 and the elastic member 26 are fixed to the main surface of the case
4. In the electric vibration converter of the present embodiment, these are the case 40. It is
provided on the circumferential side surface, and thinning of the electric vibration converter is
achieved. Fig. 2. 2 Show electrical loss converter. In this case, it is fixed to the peripheral side
surface of the case 4 by an adhesive agent or the like, but as shown in FIG. If the weight 25 and
the elastic member 26 are fitted to the protrusions, an adhesive or the like becomes unnecessary.
FIG. 14 shows an electric vibration converter as a fourth embodiment of the present invention. As
apparent from FIG. 14, in the electric vibration converter of this embodiment, the weight 25 and
the elastic member 26 are fixed to the bottom surface of the bowl-shaped member 2 which is a
component of the case 4.
By providing the weight 25 and the elastic member 26 inside the case 4 as described above, the
weight 25 and the elastic member 26 do not come in contact with an external object, and there is
no risk of damage to the weight and the elastic member. Handling of the electrical vibration
converter is facilitated. Further, as shown in FIGS. 15 to 17, it is possible to attach them to any
part in the case 4 by devising the shapes of the weight 25 and the elastic member 26. By
effectively utilizing the dead space inside the case as the installation space for the weight 25 and
the elastic member 26, the miniaturization of the entire electric vibration converter is facilitated.
FIG. 18 shows an electric vibration converter according to a fifth embodiment of the present
invention and its peripheral members. As shown in FIG. 18, in this embodiment, the weight 25
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and the elastic member 26 are attached to the electric vibration converter 10 case 4 indirectly,
that is, through the diaphragm 31. Even with such a configuration, the resonance kurtosis
suppression effect equivalent to that in which the weight 25 and the elastic member 26 are
directly attached to the case 4 such as the electric vibration converter of the first to fourth
embodiments can be obtained. Also, as shown in FIGS. 19 and 20, the same applies to the case
where the weight 25 and the elastic member 26 are attached to the vibration transmitting
member 34 carrying the electrical vibration converter 1 from the frame 32 and the diaphragm
33. It is. In addition, although all the electric vibration converters of each Example mentioned
above fix the voice coil 11 to case 4 and have the structure which attached the magnetic circuit
to this case so that vibration was possible, conversely, it is magnetic The circuit can be fixed to
the case 4 so that the voice coil side can be vibrated. As described in detail above, in the electric
vibration converter according to the present invention, the magnetic circuit and the voice coil are
enclosed to hold either the magnetic circuit or the voice coil and the other is vibratably
supported. The auxiliary vibration body is attached via an elastic member. With such a
configuration, so-called dynamic vibration absorption is performed, and hence resonance
steepness at low frequency resonance frequency: fo: suppressing Qo low, that is, flattening of
frequency characteristics is possible, and a sufficiently wide effective band is obtained. It is
[0002]
Brief description of the drawings
[0003]
1 to 7 are views for explaining a conventional electric vibration converter, and FIG. 8 is a view
showing a main part of a body-sensitive acoustic vibration apparatus including the electric
vibration converter as the first embodiment of the present invention. FIG. 9 is a diagram showing
the frequency characteristics of the electric vibration converter, FIG. 10 is a side view including a
partial cross section of the electric vibration converter as the second embodiment of the present
invention, and FIG. FIG. 12 shows a partial modification of the vibration converter, FIG. 12 is a
side view including a partial cross section of an electric vibration converter as a third
embodiment of the present invention, and FIG. 13 is a part of the electric vibration converter FIG.
14 is a view showing a modification, FIG. 14 is a longitudinal sectional view of an electric
vibration converter as a fourth embodiment of the present invention, and FIGS. 15 to 17 are
views showing a partial modification of the electric vibration converter. FIG. 18 is a front view
showing an electric vibration converter according to a fifth embodiment of the present invention
and its peripheral members, and FIGS. 19 and 20 show the electric vibration converter. It is a
diagram showing a modification of the vibration transducer and the peripheral members.
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Explanation of symbols of main parts 1 иии Electric vibration converter 4 и и и Case 5 и и и annular
magnet 6 и и и damper 7 и и annular yoke plate
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