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DESCRIPTION JP2001062396

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DESCRIPTION JP2001062396
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates mainly
to a mobile communication device (vibration transmission device) such as a portable telephone
terminal, and a coil and a magnetic circuit driven by an input electric signal. The present
invention relates to a vibration actuator.
[0002]
2. Description of the Related Art Heretofore, as this type of vibration actuator, for example, one
having a configuration as shown in the side cross-sectional view of FIG. 5 can be mentioned.
[0003]
This vibration actuator movably supports a magnetic circuit composed of permanent magnets 2,
yoke 1 and plate 3 by a central shaft 4 mounted on a support 7 via an elastic damper 6. There is.
[0004]
Concretely speaking, the damper 6 is notched around the periphery of the outer peripheral
portion 6a on the one main surface side so that the coil 5 can be positioned and mounted, and
the central portion on the one main surface side is A central shaft 4 having a retaining portion
extending perpendicularly to the uniaxial direction and abutted against the damper 6 is fitted in
the penetrating central hole.
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The magnetic circuit is mounted on the central shaft 4 with a gap between the damper 6 and the
yoke 1 mounted on the central shaft 4 with a gap between the damper 6 and the damper 6, and
the side walls thereof are mounted in the yoke 1 And a plate 3 interposed between the damper 6
and the permanent magnet 2.
That is, in the case of the vibration actuator here, the magnetic circuit and the damper 6 are
coaxially positioned by the central axis 4 and the magnetic circuit is disposed in the gap between
the side wall of the yoke 1 and the end face of the permanent magnet 2 It is concentrically
arranged with respect to the coil 5 attached to the portion 6a, and is supported so as to be
flexibly movable in one axial direction (vertical direction).
[0005]
In the case of this vibration actuator, when an oscillating current is supplied to the coil 5 in one
direction, an upward force is generated according to the law of the left of the filming, and the
magnetic circuit is displaced in the direction away from the coil 5. Vibration can be transmitted
from the outer peripheral portion 6 a of the damper 6 to the outside through the support 7 by
the coil 5. Therefore, the support base 7 of such a vibration actuator can be mounted on an
external vibration transmission device with a diaphragm interposed.
[0006]
FIG. 6 shows the main configuration of the case of fixing to the casing 9 of a portable telephone
terminal as a vibration transmission apparatus through the diaphragm 8 using this vibration
actuator. ) Relates to a plan view, and FIG. 7 (b) relates to a side cross-sectional view in which a
part is broken.
[0007]
Here, in order to transmit the vibration in the support 7 of the vibration actuator to the outside,
an adhesive is used between the support 7 and the diaphragm 8 and between the diaphragm 8
and the housing 9 of the portable telephone terminal. By fixing at 10 and 11, it is shown that the
vibration of the support base 7 is transmitted to the casing 9 of the mobile phone terminal
through the diaphragm 8.
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[0008]
In the case of fixing to a vibration receiving body via a diaphragm using the above-described
vibration actuator, the diaphragm and the vibration transmission apparatus (mobile phone
terminal) Because the space between the housings) is fixed with an adhesive, the vibration of the
magnetic circuit is transmitted from the support to the diaphragm and from the diaphragm to the
housing of the vibration transmission device (mobile phone terminal). At the same time, there is a
problem that the sound pressure level generated from the actuator is reduced by transmitting
through the hard substance called adhesion of the adhesive to cause attenuation.
[0009]
The present invention has been made to solve such problems, and its technical problem is to
provide a vibration actuator having a structure in which the sound pressure level does not
decrease even when fixed to a vibration transmission device. It is.
[0010]
According to the present invention, a magnetic circuit is movably supported by a central shaft
mounted on a support via an elastic damper, and the outer periphery of the damper is provided.
The coil and the magnetic circuit are driven by the input of an electric signal to the coil provided
in the air gap of the magnetic circuit by positioning on the periphery of the part and the coil and
the magnetic circuit are further driven. In the vibration actuator, it is possible to obtain a
vibration actuator in which at least one of the space between the support and the diaphragm and
the space between the diaphragm and the housing of the vibration transmission apparatus is
sandwiched and fixed by an elastic material.
[0011]
In this vibration actuator, a convex portion or a groove portion for positioning the support base
is formed on the diaphragm, and a convex portion or a groove portion for positioning the
diaphragm is formed on the housing of the vibration transmission device. Is preferable.
[0012]
According to the present invention, on the other hand, the magnetic circuit is movably supported
by the central shaft attached via the elastic damper on the support table, and is positioned and
mounted on the periphery of the outer peripheral portion of the damper. In the vibration
actuator, the coil and the magnetic circuit are driven by the input of an electric signal to the coil
disposed in the air gap of the magnetic circuit, and further, the vibration actuator capable of
direct mounting with an external vibration transmission device Thus, a vibration actuator can be
obtained in which the elastic transmission material is held between the housings of the vibration
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transmission device.
[0013]
In this vibration actuator, it is preferable that a convex portion or a groove portion for
positioning the support table be formed in the housing of the vibration-susceptible transmission
device.
[0014]
On the other hand, in any one of the above-mentioned vibration actuators, the elastic material
can be provided for fixing between members by heat staking, press-fitting or screwing.
[0015]
In the vibration actuator, the elastic material is preferably a double-sided tape or a foam-based
material.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION The vibration actuator of the present
invention will be described in detail with reference to the drawings by way of examples.
[0017]
FIG. 1 is a side sectional view showing the basic configuration of a vibration actuator according
to an embodiment of the present invention.
The vibration actuator also has substantially the same configuration as that of the conventional
product described in FIG. 5, and the permanent magnet 2, the yoke 1, and the central shaft 4
attached via the damper 6 having elasticity on the support base 7. The magnetic circuit
composed of the plate 3 is movably supported.
[0018]
That is, in the damper 6, the peripheral edge of the outer peripheral portion 6a on the one main
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surface side is notched so that the coil 5 can be positioned and mounted, and a central hole
penetrating the central portion on the one main surface side A central shaft 4 having a retaining
portion extending perpendicularly to the uniaxial direction and abutted against the damper 6 is
fitted to the shaft.
The magnetic circuit is mounted on the central shaft 4 with a gap between the damper 6 and the
yoke 1 mounted on the central shaft 4 with a gap between the damper 6 and the damper 6, and
the side walls thereof are mounted in the yoke 1 And a plate 3 interposed between the damper 6
and the permanent magnet 2.
Also in the case of the vibration actuator here, the magnetic circuit and the damper 6 are
coaxially positioned by the central shaft 4, and the magnetic circuit is disposed in the gap
between the yoke 1 side wall and the end face of the permanent magnet 2. It is arranged
concentrically with respect to the coil 5 attached to 6a, and is supported so as to be flexibly
movable in one axial direction (vertical direction).
[0019]
Incidentally, in each part here, the support base 7 and the outer peripheral portion 6a of the
damper 6 may be integrated, and the central shaft 4 and the damper 6 are fixed by press fitting,
bonding, caulking or the like. If the central shaft 4 and the damper 6 are made of the same
material, welding becomes possible.
[0020]
Furthermore, in the case of this vibration actuator, an elastic material for mounting the support 7
on the main surface opposite to the one main surface of the support 7 with the diaphragm
interposed therebetween to the external vibration receiving apparatus. As a double-sided tape 12
is fixed.
[0021]
FIG. 2 shows a main part configuration in the case of fixing to a casing 19 of a portable telephone
terminal as a vibration transmitting body via a vibrating plate 18 using this vibration actuator. )
Relates to a plan view, and FIG. 7 (b) relates to a side cross-sectional view in which a part is
broken.
[0022]
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Here, as described above, on the main surface opposite to the one main surface side of the
support table 7, the support table 7 is attached to the casing 19 of the external portable
telephone terminal with the diaphragm 18 interposed. While the double-sided adhesive tape 12
is fixed, the positioning plate 18 is formed on the diaphragm 18 for positioning the outer
diameter of the support base 7, and the casing 19 of the mobile phone terminal is A positioning
projection 19a for positioning the outer diameter is formed, and between the support 7 and the
diaphragm 18 and the diaphragm 18 and the portable telephone terminal to transmit the
vibration in the support 7 of the vibration actuator to the outside. The vibration of the support
base 7 is transmitted to the housing 19 of the mobile phone terminal through the diaphragm 18
by sandwiching and fixing the housing 19 between the double-sided tapes 12 and 13 as elastic
materials. Indicates that There.
[0023]
Thus, in this vibration actuator, when the vibration of the magnetic circuit is transmitted from the
support base 7 to the diaphragm 18 and further from the diaphragm 18 to the casing 19 of the
portable telephone terminal, it is called double-sided tapes 12 and 13. The sound pressure level
generated by the actuator is well kept large without being attenuated to transmit in the soft
substance.
[0024]
By the way, it is desirable from the viewpoint of improving mechanical strength that the doublesided adhesive tapes 12 and 13 be further subjected to heat staking, press-fitting, or screwing to
fix the members between them.
[0025]
FIG. 3 is a side view showing the structure of the double-sided tapes 12 and 13 used for this
vibration actuator.
[0026]
The double-sided adhesive tapes 12 and 13 are formed by applying the adhesive 16 on both
sides of the base material 15. The adhesive 16 has elasticity so as to improve the vibration
transmission.
It is preferable to use any one of non-woven fabric, polyester film, expanded butyl rubber and
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expanded polyethylene as the base material 15 here.
[0027]
FIG. 4 compares the characteristics of the sound pressure level (dB) against the frequency (Hz)
between the vibration actuator of the structure of one embodiment described in FIG. 2 and the
vibration actuator of the conventional structure described in FIG. It is shown.
[0028]
From FIG. 4, the conventional structure shown by the solid line in which three points between the
support base 7 and the diaphragm 8 and between the diaphragm 8 and the casing 9 of the
portable telephone terminal are fixed by the adhesives 10 and 11, respectively. The structure of
an embodiment shown by a dotted line in which three points of the vibration actuator of the
present invention and between the support base 7 and the diaphragm 18 and between the
diaphragm 18 and the housing 19 of the mobile phone terminal As compared with the vibration
actuator of the above, it can be seen that the sound pressure measurement result shows that the
sound pressure level around 15 dB is improved as compared with the conventional structure in
the structure of the embodiment.
[0029]
In the vibration actuator according to the embodiment described above, the positioning convex
portion 18a formed on the diaphragm 18 and the positioning convex portion 19a formed on the
casing 19 of the mobile phone terminal have the support base 7 and the vibration. Although the
outer diameter of the plate 18 is to be positioned, the inner diameter may be positioned instead
of the outer diameter, or both of the inner and outer diameters may be positioned, and the
positioning convex portion may be substituted. It is also possible to use positioning grooves.
Also, in the case of the vibration actuator of one embodiment, the space between the support
base 7 and the diaphragm 18 and the space between the diaphragm 18 and the casing 19 of the
mobile phone terminal are respectively sandwiched and fixed by double-sided tapes 12 and 13 as
elastic materials. Although the configuration is described, a foam material may be used instead of
the double-sided tapes 12 and 13.
However, also in this configuration, it is desirable that the foamed material is further fixed by
heat squeezing, press-fitting, or screwing to increase the mechanical strength.
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Furthermore, in the case of the vibration actuator according to one embodiment, the
configuration is such that attachment to the external vibration transmission device is possible via
the diaphragm 18, but instead, direct attachment to the external vibration transmission device is
possible. Can also be configured.
In this case, specifically, the space between the support 7 and the casing 19 of the portable
telephone terminal is sandwiched between the double-sided tape 12 or the foaming material as
an elastic material, and is mounted and fixed. The positioning projections 19a and positioning
grooves for positioning the support 7 may be formed.
Even when any configuration is applied, a characteristic that the sound pressure level is
improved as shown by the dotted line in FIG. 4 is obtained.
[0030]
As described above, according to the vibration actuator of the present invention, the diaphragm
is mounted so that the vibration is not damped when it is mounted on the external vibration
receiving device from the support and the vibration is transmitted. When it is possible to attach
an external vibration transmission device via an elastic material between the support and the
diaphragm and between the vibration plate and the housing of the vibration transmission device,
and the external vibration transmission device When it is possible to directly mount the support
base and the housing of the vibration transmission apparatus by sandwiching it with an elastic
material and fix each mounted, the sound pressure level is transmitted without being damped.
Therefore, it is possible to measure the sound pressure level without the prior art.
Also, in the case of the former configuration, the convex portion or groove portion for positioning
the support base is formed on the diaphragm, and the convex portion or groove portion for
positioning the diaphragm on the housing of the vibration transmission device is formed. In the
case of the latter configuration, a convex portion or a groove portion for positioning the support
base is formed in the housing of the vibration receiving device, thereby sandwiching the elastic
material with the double-sided tape or the foam material. In addition to facilitation, the
mechanical strength can be further enhanced by performing heat welding from above, pressfitting, or screwing to increase the mechanical strength, so it is stable even in long-term use.
Work, and can improve durability and reliability.
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[0031]
Brief description of the drawings
[0032]
1 is a side sectional view showing the basic configuration of a vibration actuator according to an
embodiment of the present invention.
[0033]
2 shows a main part configuration in the case of fixing to a casing of a mobile phone terminal as
a vibration transmitting body through a diaphragm using a vibration actuator shown in FIG. 1, (a)
relates to a plan view , (B) relates to a side cross-sectional view partially broken.
[0034]
3 is a side view showing the structure of the double-sided tape used for the vibration actuator
shown in FIG.
[0035]
4 shows the characteristics of the sound pressure level against the frequency of the vibration
actuator described in FIG. 2 and the vibration actuator described in FIG. 6 in comparison.
[0036]
5 is a side sectional view showing the basic configuration of a conventional vibration actuator.
[0037]
6 shows a main part configuration in the case of fixing to a casing of a mobile phone terminal as
a vibration transmitting body through a diaphragm using a vibration actuator shown in FIG. 5, (a)
relates to a plan view , (B) relates to a side cross-sectional view partially broken.
[0038]
Explanation of sign
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[0039]
DESCRIPTION OF SYMBOLS 1 yoke 2 permanent magnet 3 plate 4 central axis 5 coil 6 damper 6
a outer peripheral portion 7 support base 8, 18 diaphragm 9, 19 casing of mobile phone terminal
10, 11 adhesive 12, 13 double-sided tape 15 base 16 adhesive 18a, 19a Positioning projection
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