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JP2003300017

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DESCRIPTION JP2003300017
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
multifunctional (multi-mode) vibration actuator mainly provided in a portable device such as a
portable telephone and a portable terminal and having a vibration function and a melody calling
function at the time of incoming call etc. More specifically, the present invention relates to a
vibration actuator having a structure in which a diaphragm and a magnetic circuit operate stably.
[0002]
2. Description of the Related Art Heretofore, as this type of vibration actuator, for example, one
having a configuration as shown in FIG. The vibration actuator 10 has a substantially annular
plate-like permanent magnet 2 sandwiched between a yoke 1 having a central hole and a plate 3
so as to make their axial centers coincide with each other, and then fixed to the central hole in
their central holes. The magnetic circuit is flexibly supported by the suspension 5 fixed to the
vibration transmitting portion 4 provided outside the magnetic circuit while forming a magnetic
circuit through 11 by inserting the magnetic circuit flexibly. The inner side of the suspension 5 is
the yoke of the magnetic circuit It is fixed to the outer peripheral part of 1 and fixed so as to be
inserted on the step difference surface of the buffer support 9 and the vibration transfer part 4
on the step difference of the vibration transfer part 4 to which the buffer support 9 is attached.
[0003]
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Further, in this vibration actuator 10, as in the case of the suspension 5, the vibration body U
provided at an arbitrary position in the radial direction of the vibration body 6 whose outer
peripheral portion is fixed to the vibration transmission portion 4 through the end face of the
buffer support material 9. The coil 7 is disposed in the air gap of the magnetic circuit by fixing
the coil 7 to the character-shaped portion 8 with an adhesive or the like. The coil 7 is formed by
aligning and winding the main parts of a wire (not shown), and the lead-out portion thereof is
formed in a V-shape, U-shape, bellows-shape or a combination thereof on the surface of the
vibrating body 6 Bonding with an elastic agent such as an adhesive agent arranged in a point-like
manner at an arbitrary position of the vibration transmitting unit 4 and soldering the both ends
of the lead-out portion to a terminal plate (not shown). Is configured.
[0004]
Furthermore, when a sound generator such as a normal speaker or a buzzer is configured by the
vibration actuator 10, the coil 7 is used as a voice coil for sound generation and the vibrating
member 6 of a movable portion in relation to the magnetic circuit is a diaphragm having a light
mass. Because of the structure described above, for example, the mechanical strength is good
against drop, impact, and the like.
[0005]
In the vibration actuator 10 having such a configuration, when a drive current is supplied to the
coil 7, the magnetic circuit or the coil 7 repeatedly moves up and down in the axial direction, and
when the vibration transfer unit 4 has a low frequency, the fixed portion or the high frequency In
this case, it becomes an elastic body and vibrates as a part of the vibrating body 6, and in the
vibration mode, the magnetic circuit and the coil 7 fixed to the vibrating body 6 act mutually to
operate in the opposite phase and vibrate to the outside It has a structure to convey
[0006]
Incidentally, as a portable device provided with such a vibration actuator 10, for example, a
portable telephone provided with a vibration function to which a method of transmitting a state
by vibration is applied, a PDA portable terminal, a toy, etc. may be mentioned. The portable
telephone, PDA portable terminal, toy etc. which were equipped with the melody calling function
which applied the method of transmitting.
[0007]
Such portable devices are configured to have vibration data and melody chords separately, in the
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case of having two functions of a normal vibration function and a melody calling function.
[0008]
SUMMARY OF THE INVENTION In the case of the vibration actuator described above, when it is
configured as a sounding body, the magnetic circuit and its vertical direction are made to move
the magnetic circuit having a much heavier mass than the vibrating body serving as the vibrating
plate. Because the load is applied to the suspension as a spring to support the movement in the
above, under such conditions, the performance to secure sufficient mechanical strength to cope
with external load such as falling or impact, and There is a problem that it takes a lot of labor and
burden in testing and designing of reliability, and structural improvement to the burden of the
suspension that supports the magnetic circuit is desired.
[0009]
The present invention has been made to solve such problems, and the technical problem is to
improve the load on the suspension that supports the magnetic circuit, and to sufficiently cope
with external loads such as drops and shocks. An object of the present invention is to provide a
vibration actuator having a structure capable of improving mechanical strength and ensuring
stable operation.
[0010]
According to the present invention, a substantially annular plate-like permanent magnet is
sandwiched and fixed between a yoke having a central hole and a plate so that their axial cores
coincide with each other. The central axis is inserted through the central hole to form a magnetic
circuit, and the magnetic circuit is flexibly supported by a suspension fixed to a vibration
transmitting unit provided outside the magnetic circuit, and the vibration transmitting unit
supports the magnetic circuit. In a vibration actuator of a structure in which a coil is fixed so as
to be disposed in an air gap portion of the magnetic circuit in a vibration body which is attached
to be separated from a suspension, a magnetic circuit extends along a central axis. Thus, it is
possible to obtain a vibration actuator provided with a movement restricting shaft for restricting
the movement in the direction perpendicular to the extending direction of the shaft core so as to
move only up and down in the direction.
[0011]
Further, according to the present invention, in the above-mentioned vibration actuator, the
movement restricting shaft is from an end surface opposite to the suspension on the central axis
in a non-vibration-free state, to a midway portion in the extending direction of the axial center. A
vibration actuator in which one end portion and a middle portion are inserted into an insertion
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hole formed at a portion, and the other end portion extends in the extension direction of the axis
opposite to the suspension and is fixed to an outer member Is obtained.
[0012]
Furthermore, according to the present invention, in the above-mentioned vibration actuator, an
outer member as an outer member attached to the vibration transmission portion so as to cover
the magnetic circuit is provided, and the movement restricting shaft has an outer end near the
other tip. A vibration actuator is obtained, which is fixed to the member.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described in detail with reference to the drawings.
[0014]
FIG. 1 is a side sectional view showing a basic configuration of a vibration actuator according to
one embodiment of the present invention.
Also in the case of this vibration actuator, the substantially annular plate-like permanent magnets
2 are sandwiched and fixed between the yoke 1 having the central hole and the plate 3 so that
their axial cores coincide with each other, and then they are centered in their central holes. The
shaft 11 is inserted through to form a magnetic circuit, and the magnetic circuit is flexibly
supported by the suspension 5 fixed to the vibration transmitting unit 4 disposed outside the
magnetic circuit, and the suspension 5 is connected to the vibration transmitting unit 4 The
structure is such that the coil 7 is fixed so as to be disposed so as to enter the air gap portion of
the magnetic circuit in the vibration body 6 which is separately attached and attached, but the
central axis 11 here is a magnetic A movement restricting shaft 12 is provided to allow the
circuit to move only up and down in the extending direction of the axis so as to restrict
movement in a direction perpendicular to the extending direction of the axis.
[0015]
Specifically, the movement restricting shaft 12 has one end in an insertion hole formed in the
central axis 11 from the end surface on the opposite side to the suspension 5 to the middle
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portion in the extending direction of the axial center. The part and the middle part are inserted,
and the other end is extended to the extension direction of the axis opposite to the suspension 5,
and the other end is attached to the vibration transmission part 4 so as to cover the magnetic
circuit. It is fixed to an outer member such as a case as an outer member which is not fixed.
In such a case, it is preferable that an outer member such as another case be attached to the
vibration transmitting portion 4 so as to cover the vibrating body 6 also on the opposite side of
the vibrating body 6.
[0016]
Also in this vibration actuator 10, the other detailed configuration remains the same as in the
conventional structure, and the inside of the suspension 5 is fixed to the outer periphery of the
yoke 1 of the magnetic circuit, and the outside is the vibration transmission portion attached
with the buffer support 9 Vibration is fixed so as to be inserted on the step difference surface of
the shock absorber support 9 and the vibration transfer unit 4 with respect to the step difference
of 4, and the outer peripheral portion is fixed to the vibration transfer unit 4 through the end
face of the shock absorber support 9 The coil 7 is disposed in the air gap of the magnetic circuit
by fixing the coil 7 with an adhesive or the like to the vibrator U-shaped portion 8 provided at an
arbitrary position in the radial direction of the body 6.
Also in the case of this coil 7, the main parts of the wire not shown are aligned and wound, and
the lead-out portion thereof is formed into a V-shape, U-shape, bellows-like shape or the like on
the surface of the vibrating body 6. Attach the middle part of the lead-out part with an elastic
agent such as an adhesive agent arranged in a point shape at an arbitrary position of the
vibration transmitting part 4 and solder the both ends of the lead-out part to a terminal plate (not
shown) It is composed.
[0017]
In the case of the vibration actuator 10 having such a configuration, if it is configured as a
sounding body such as a normal speaker or buzzer, the vibrating member 6 of the portion
movable in relation to the magnetic circuit after forming the coil 7 as a voice coil for sounding
And a shaft 12 for restricting movement in a direction perpendicular to the extending direction
of the axial center, and the magnetic circuit can be moved only up and down in the extending
direction of the axial center with the central axis 11 as the light diaphragm. In order to move the
magnetic circuit having a much heavier mass than that of the vibrating body 6 serving as the
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vibrating plate, the suspension 5 as a spring for supporting the magnetic circuit and its
movement in the vertical direction is additionally provided. The load from the outside such as a
drop or an impact can be sufficiently prevented, mechanical strength is improved, and the basic
operation is stabilized.
[0018]
That is, also in the vibration actuator 10, when a drive current is supplied to the coil 7 as in the
conventional case, the magnetic circuit or the coil 7 repeatedly moves up and down in the axial
direction, and the fixing portion when the vibration transmitting portion 4 has a low frequency,
In the case of a high frequency, it becomes an elastic body and vibrates as a part of the vibrating
body 6, and in the vibration mode, the magnetic circuit and the coil 7 fixed to the vibrating body
6 act mutually to operate in the opposite phase. In this case, the mechanical strength is improved
more than in the case of the conventional structure by the presence of the movement restricting
shaft 12 provided on the central axis 11 mentioned above, and the diaphragm 6 and the
magnetic circuit are stabilized. To work.
[0019]
Incidentally, even in the case of such a vibration actuator 10, it is preferable to use it as a multi
mode which is mounted on a portable device and bears a vibration function and a melody calling
function. In such a case, for example, More reliable calling operation can be performed.
[0020]
As described above, according to the vibration actuator of the present invention, the axial
structure in the conventional magnetic circuit is improved, and the magnetic circuit is made to
the central axis inserted through the central hole of the magnetic circuit. Since a movement
restricting shaft is provided which can move only up and down in the extending direction of the
axis and restrict movement in the direction perpendicular to the extending direction of the axis,
even if it is configured as a normal sounding body To move the magnetic circuit having a much
heavier mass than the vibrating body serving as the diaphragm, the magnetic circuit and the
suspension as a spring for supporting the movement in the vertical direction are not burdened
extra, and the magnetic circuit The burden of supporting suspension will be improved.
As a result, it is possible to sufficiently cope with external loads such as dropping and impacting,
improve mechanical strength, and simplify and inexpensively provide a highly reliable vibration
actuator that ensures stable operation. If such a vibration actuator is mounted on a portable
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device, it is possible to make the operator perform a more reliable calling operation, which is
preferable.
[0021]
Brief description of the drawings
[0022]
1 is a side sectional view showing a basic configuration of a vibration actuator according to an
embodiment of the present invention.
[0023]
2 is a side sectional view showing the basic configuration of a conventional vibration actuator.
[0024]
Explanation of sign
[0025]
Reference Signs List 1 yoke 2 permanent magnet 3 plate 4 vibration transmission unit 5
suspension 6 vibration body 7 coil 8 vibration body U-shaped portion 9 buffer support material
10 vibration actuator 11 central axis 12 movement restricting shaft
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