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JP2004282680

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DESCRIPTION JP2004282680
The present invention provides an impact-resistant low frequency sound oscillation transducer
technology. A low frequency sound oscillation transducer for oscillating a sound wave in a low
frequency sound band in which a metal plate is attached to front and back surfaces of ferrite
moved by vibration, between the respective surfaces of the front and back surfaces and a
container A low frequency sound oscillation transducer characterized in that each of the shock
absorbers is disposed. [Selected figure] Figure 2
Low frequency sound oscillation transducer
FIELD OF THE INVENTION The present invention relates to low frequency sound oscillating
transducers. [0002] As a transducer which is a low frequency oscillator, Japanese Patent
Application Laid-Open No. 11-056517, Japanese Patent Publication No. 07-112305, Japanese
Patent Publication 07-061198, Japanese Patent Publication 07-061197, Japanese Patent
Publication 07-061196, There is fair 07-061195 and the like. Known prior art documents: JP-A11-056517, JP-B-07-112305, JP-B-07-061198, JP-B-07-061197, JP-B-07-061196, JP-B-07061195. In the conventional low frequency sound oscillation transducer, it is necessary to fix the
internal ferrite so as not to vibrate when an impact is applied during transportation or the like.
And when actually using it, it was decided to remove this fixed part and to obtain a
predetermined characteristic. However, when this low frequency sound oscillation transducer is
mounted on a portable cushion and used, there is a concern of damage since it may be subjected
to the same impact as during transportation. There is a problem that when the fixed parts for
transportation are used while being mounted to prevent damage, predetermined characteristics
can not be obtained. SUMMARY OF THE INVENTION A low frequency sound oscillation
transducer according to the present invention oscillates a sound wave in a low frequency sound
band in which a metal plate is attached to the front and back of ferrite moved by vibration. In
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addition to the above, the first feature is that a shock absorber is disposed between each of the
front surface and the rear surface and the container, and secondly, in addition to the first feature,
the shock absorber Third, in addition to the first or second feature, the container surface in
contact with the shock absorber may be provided with a plurality of projections and / or
depressions, in addition to the first or second feature. Fourth, in addition to any one of the first to
third features, the ferrite has a hollow cylindrical shape, and the front metal plate of the metal
plates has a T shape when viewed from the side. In addition to any one of the first to fourth
features, the container and the front metal plate are provided with a spring. Sixth, in addition to
the fifth feature, it is characterized in that it comprises a plurality of projections on the top of the
container. BEST MODE FOR CARRYING OUT THE INVENTION In the low frequency sound
oscillation transducer of the present invention according to the present invention, a low
frequency sound wave is generated in which a metal plate is attached to the front and back of
ferrite moved by vibration. In addition to the above, in the case of the first feature that shock
absorbers are respectively disposed between the front surface and the back surface and the
container, the ferrite is disposed adjacent to the ferrite. When vibrating with the alternating
magnetic field generated by the coil, the shock absorber is expanded and contracted.
Ensuring the mobility of the shock absorber so as not to disturb the oscillation characteristics
required as low frequency sound oscillation, and preventing the transducer from being damaged
by externally applied vibrations such as drops during normal use or transportation The shape
and material of the shock absorber are selected so as to meet both requirements. Second, in
addition to the first feature, when the shock absorber is characterized by being made of urethane
foam, a material obtained by molding urethane foam into a hollow cylinder, that is, a donut shape
is used as a shock absorber. Third, in addition to the first or second feature, in the case where the
container surface in contact with the shock absorber is provided with a plurality of projections
and / or depressions, an impact is applied and the ferrite is The impact is absorbed gradually by
absorbing and relieving the impact while the projection is embedded in the shock absorber. More
specifically, in the normal state of the ferrite, the shock absorber breaks in contact with the
protrusion in a point contact state under normal conditions, and in the initial stage where the
ferrite starts to move due to an impact, the peak of the protrusion sinks into the shock absorber
Happens relatively easily. In the middle stage of movement, movement is somewhat hindered by
the fact that the resistance in the process of sinking into the shock absorber up to near the
middle of the protrusion is higher than in the initial stage. At the later stage of movement, the
resistance to movement is further increased because the region near the foot of the protrusion
sinks into the shock absorber. Thus, the action of preventing the movement is gradually
enhanced from the early stage to the late stage of the movement by the protrusion being
embedded. The same phenomenon occurs in the case where the recess is provided. By providing
this protrusion and / or the recess, the tolerance of the incorporation accuracy of the ferrite is
increased. When the ferrite is vibrated in a state in which the shock absorber and the container
surface are in contact, expansion and contraction of the shock absorber occur, but the vibration
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strength differs due to the resistance to the expansion and contraction. In the case of close
contact, the vibration intensity is suppressed. That is, the vibration characteristics differ
depending on the built-in state. In the case where the protrusion and / or the recess is provided,
the effect of the vibration suppression does not differ much even when the mounting position is
shifted. Furthermore, the provision of the projection and / or the recess also has the effect of
suppressing the horizontal displacement of the surface.
Fourth, in addition to any one of the first to third features, the ferrite has a hollow cylindrical
shape, and the front metal plate of the metal plates has a T-shape when viewed from the side.
When it is characterized in that it is symmetrical and that the back metal plate is hollow
cylindrical, the T-shaped shaft portion of the T-shaped metal plate enters the central axis of the
ferrite vibration coil, The coil is sandwiched between the shaft and the inner surface of the
ferrite. Fifth, in addition to any one of the first to fourth features, in the case where the container
and the front metal plate have a feature of being screwed through a spring, the whole surface
metal plate and the ferrite And the damage can be prevented without disturbing the vibration in
the low frequency sound area of the lump where the back metal plate is united as much as
possible. Sixth, in addition to the fifth feature, in the case where a plurality of projections are
provided on the top of the container, the vibration of the transducer can be efficiently
transmitted to the other side in contact with the projections. . Embodiment 1 of the present
invention will be described. FIG. 1 shows the internal structure of the transducer of the present
invention in an exploded view. When the parts shown in the state of being removed in the
longitudinal direction are assembled in the form of vertical packing, it becomes a transducer of
low frequency sound oscillation. The front metal plate 4 and the rear metal plate 5 are attached
to the front surface 2 and the rear surface 3 of the ferrite 1 moving vertically by vibration, and
the front shock absorber 7 and the rear shock absorber 8 are arranged between the container 6
It is set up. The back metal plate and the back spring 9 are in contact with each other. The back
shock absorber is attached to the inside to the back metal plate, and the back shock absorber is
attached near the outer periphery. The relationship between the front spring 10, the front metal
plate, and the front shock absorber is the same. The back spring and the back panel 11 are
disposed in contact with each other. The rear shock absorber and the rear panel are normally in
close proximity and not in contact. A back label 12 is attached to the back of the back plate. The
back label describes the name and model number of the transducer. The drive coil 13 is bonded
to the back panel. The back spring is fixed to the back plate by a back set screw 14. The front
spring is fixed to the container by a front set screw 15.
In the transducer of FIG. 1, when an alternating current is applied to the drive coil, the ferrite is
vibrated by the induced magnetic field. The front and back metal plates fixed to the ferrite and
the front and back shock absorbers vibrate together. This vibration causes the front and back
springs to expand and contract alternately. The front and rear shock absorbers usually do not
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contact the container and the rear panel during vibration, or do not disturb the vibration due to
deformation of the shock absorber itself even if they are in contact. A second embodiment of the
present invention will be described. The structure is shown in FIG. This is an example in which
the contact portion between the rear shock absorber 8 and the rear panel 11 is elaborated. The
back panel 11 is provided with a protrusion toward the inside. This projection is called back
projection 17. The rear shock absorber is in contact with the rear projection so as to be slightly
embedded. This contact prevents the ferrite from shifting in the direction perpendicular to the
axis. The degree of suppression can be adjusted by the degree of depression. Vibrations in the
direction parallel to the axis are not disturbed. A third embodiment of the present invention will
be described. The structure is depicted in FIG. As in FIG. 2, but with the back projection and the
back and front shock absorbers omitted. Instead, the fixing screw 18 is attached at the center of
the axis. The fixing screw has two roles of preventing vibration from shaking and preventing
damage due to excessive vibration. Since the fixing screw spring 19 is used for fixing, in the
range of the flexibility of the fixing screw spring, consideration is given not to disturb the
vibration. A fourth embodiment of the present invention will be described. FIG. 4 is the block
diagram. The back projection 17 and the back spring 9 are in contact with each other. "The
transducer is designed to prevent the ferrite of the transducer from shifting in the rotational
direction by increasing the coefficient of friction between the rear spring and the projection.
According to the transducer of the present invention, low frequency noise can be emitted with
high efficiency while the life is extended while preventing damage during transportation or
handling. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a first
embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing Example
2 of the present invention. FIG. 3 is a schematic cross-sectional view showing Example 3 of the
present invention. FIG. 4 is a schematic cross-sectional view showing Example 4 of the present
invention.
[Description of the code] 1 is ferrite, 2 is front, 3 is back, 4 is front metal plate, 5 is back metal
plate, 6 is container, 7 is front shock absorber, 8 is back shock absorber, 9 is back spring, 10 is a
front spring, 11 is a back panel, 12 is a back label, 13 is a drive coil, 14 is a back set screw, 15 is
a front set screw, 16 is an electrode, 17 is a back projection, 18 is a set screw, and 19 is a set
screw It is a spring for.
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