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JP2001353471

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DESCRIPTION JP2001353471
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
multi-functional vibration actuator which is mainly mounted on mobile communication devices
such as mobile phones and has a function of generating ringing tone, voice and vibration.
[0002]
2. Description of the Related Art An example of a conventional multi-functional vibration actuator
is shown in FIG. Fig.2 (a) is sectional drawing, FIG.2 (b) is a figure which shows the state which
adhered the coil wire to the vibrating body.
[0003]
In the conventional multifunctional vibration actuator shown in FIG. 2, a suspension 4 of an arcshaped spiral leaf spring in which a magnetic circuit composed of a yoke 1 ', a permanent
magnet 2' and a plate 3 'is fixed to a vibration transmitting portion 8'. The suspension 4 'is fixed
to the outer periphery of the yoke 1' of the magnetic circuit and the vibration transmitting
portion 8 '. A coil 6 'fixed by an adhesive or the like to a vibrating body U-shaped portion 16'
provided at an arbitrary position in the radial direction of the vibrating body 5 'is disposed in the
air gap of the magnetic circuit, as shown in FIG. As shown, the coil wire 19 'is attached to the
outer periphery of the vibrator 5' in the normal direction with an elastic material 20 'such as an
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adhesive and solder 15' is attached to the terminal plate 14 '.
[0004]
The vibrator 5 'is fixed to the vibration transmitter 8' in the same manner as the suspension 4 ',
and when a drive current is supplied to the coil 6', the magnetic circuit or coil 6 'repeatedly
moves up and down in the axial direction to vibrate The transmitting part 8 'is a fixed part at low
frequencies and an elastic body at high frequencies to be a part of the vibrator 5' and vibrates,
and the coil 6 'is fixed to the magnetic circuit and the vibrator 5' in the vibration mode. Are
mutually acting, operate in opposite phase, and transmit vibrations to the outside.
[0005]
At this time, the gap bi (i = 1, 2, 3,..., N) between the magnetic circuit or the suspension 4 ′ and
the vibrator 5 ′ and the gap a between the magnetic circuit and the cover A9 ′ are
approximately the same (a Is about bmin), and a cover A9 'and a cover B10' for protecting the
functional main body are fixed to the vibration transfer part 8 ', and one or a plurality of air of
any diameter is fixed to the cover A9'. A sound emission hole 11 'for viscous damping was
provided.
Reference numeral 7 'denotes a central axis inserted through the central hole of the magnetic
circuit.
[0006]
In the structure of the conventional multi-functional vibration actuator, the coils fixed to the
magnetic circuit and the vibrator in the vibration mode act on each other and operate in the
opposite phase, but in the vicinity of the resonance frequency Since the amplitude becomes large,
the magnetic circuit or the suspension may come in contact with the vibrating body to generate
an abnormal sound. In addition, by pasting the coil wire to the outer periphery of the vibrating
body in the normal direction with an elastic material such as adhesive, the unstable operation of
the vibrating body is brought about in the acoustic mode, and the drive input voltage is further
increased If you do, it may break and become inoperable.
[0007]
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Therefore, an object of the present invention is to provide a multi-functional vibration actuator in
which the magnetic circuit or the suspension does not contact the vibrating body near the
resonance frequency, and the vibrating body operates stably in the acoustic mode.
[0008]
SUMMARY OF THE INVENTION In order to solve these problems, the present invention provides
a gap between the magnetic circuit and the suspension and the vibrator larger than the gap
between the magnetic circuit and the cover, and further, the vibrator has a flat plate shape and a
plate. Avoid contact between the magnetic circuit and the vibrating body near the resonance
frequency of the vibration mode by making it a plate, curved surface, corrugation or a
combination of each and any curvature shape that minimizes harmonic distortion components
Can be a multifunctional vibration actuator.
At this time, the vibrator is at least one of polyether imide (PEI), polyethylene terephthalate
(PET), polycarbonate (PC), polyphenylene sulfide (PPS), polyarylate (PAR), polyimide (PI) and
aramid (PPTA). Preferably, it is formed of one type of plastic film material.
[0009]
In addition, a coil wire fixed to the vibrating body is formed by winding the surface of the
vibrating body in a square shape, a U shape, a bellows shape, or a combination of each, and
forming an adhesive or the like in any shape on the vibrating body. By attaching with an elastic
material, it is a multifunctional vibration actuator that suppresses unstable operation in the
acoustic mode to bring about a reduction in distortion, and does not cause disconnection due to
drive input voltage, long-time drive, and the like.
[0010]
That is, according to the present invention, a magnetic circuit configured using a permanent
magnet, a coil disposed in an air gap of the magnetic circuit and fixed to a vibrating body, and a
suspension of an arc-shaped spiral leaf spring fixed to a vibration transmitting portion. Thus, in
the multifunctional vibration actuator flexibly supporting the magnetic circuit, the gap between
the magnetic circuit or the suspension and the vibrator is larger than the gap between the
magnetic circuit and the cover. .
[0011]
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Further, according to the present invention, the magnetic circuit of the multi-functional vibration
actuator and the coil fixed to the vibrator are multi-functional vibration actuators operating in
opposite phase to each other.
[0012]
In the multi-function vibration actuator according to the present invention, the vibration body of
the multi-function vibration actuator has a curvature shape that suppresses a harmonic distortion
component, and the vibration body has a shape avoiding contact with the magnetic circuit.
[0013]
Further, the present invention is the multifunction vibration actuator in which the vibrator of the
multifunction vibration actuator has a flat plate shape, a plate shape, a curved surface shape, a
corrugation shape or a combination thereof.
[0014]
Further, according to the present invention, a coil wire fixed to the vibrator is wound on the
surface of the vibrator in a V-shape, a U-shape, a bellows shape or a combination of each, and a
point is placed at an arbitrary position of the vibrator. Multi-functional vibration actuator
attached with an elastic material such as an adhesive.
[0015]
Further, according to the present invention, the vibrator is made of polyether imide (PEI),
polyethylene terephthalate (PET), polycarbonate (PC), polyphenylene sulfide (PPS), polyarylate
(PAR), polyimide (PI) and aramid (PPTA). And a multifunctional vibration actuator formed of at
least one plastic film material.
[0016]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
multifunctional vibration actuator according to the present invention will be described below.
[0017]
An explanatory view of the multifunctional vibration actuator of the present invention is shown
in FIG.
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FIG. 1A is a cross-sectional view, and FIG. 1B is a view showing a state in which a coil wire is
fixed to a vibrating body.
[0018]
FIG. 1 is a cross-sectional view and a partial cutaway view of an embodiment of the present
invention.
A magnetic circuit is formed by the yoke 1 and the plate 3 so as to sandwich the disk-shaped
permanent magnet 2 and has an internal magnet type structure.
A central shaft 7 in the form of a bolt, a pin or the like is inserted through the central hole of the
magnetic circuit to position the yoke 1, the permanent magnet 2 and the plate 3 coaxially.
At this time, the central axis may be removed after coaxially positioning the yoke 1, the
permanent magnet 2, and the plate 3, and the magnetic circuit component may be fixed by
combined use of the attraction force of the permanent magnet 2 or an adhesive. There is.
The suspension 4 is a single arc-shaped spiral leaf spring that flexibly supports the magnetic
circuit, and is fixed to the outer peripheral portion of the yoke 1 by an elastic material 18 such as
an adhesive, an adhesive, or a resin, or caulking. The other end is fixed to the vibration
transmission unit 8.
[0019]
On the other hand, the coil 6 is fixed to the surface of the vibrating body 5 so as to be hard to
come off and highly reliable U-shaped portion 16 by an adhesive or the like, and is disposed in
the air gap of the magnetic circuit.
[0020]
At this time, as shown in FIG. 1 (b), the coil wire 19 has a U-shape, a U-shape, a bellows shape or
the like on the surface of the vibrating body 5 so that the vibration of the vibrating body 5 is not
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adversely affected. By bonding each with a combined shape and bonding with an elastic material
20 such as an adhesive or the like in an arbitrary position on the vibrating body, unstable
operation in the acoustic mode is suppressed and distortion is reduced. In addition, disconnection
due to drive input voltage and long-time drive can be prevented, and solder 15 is connected to
terminal plate 14 of terminal block 13 provided on the outer periphery of vibration transfer unit
8 to protect coil wire 19 and the connection portion Is covered with a protective agent 17.
[0021]
Further, the suspension 4 is fixed to the outer peripheral portion of the yoke 1 to suppress the
sway of the magnetic circuit, and to avoid contact with the vibrating body 5 due to excessive
amplitude such as drop impact of the magnetic circuit. A stopper 12 is provided on the housing.
At this time, one or more stoppers 12 or the entire inner peripheral portion is formed.
[0022]
In the vibration mode, the coil 6 fixed to the magnetic circuit and the vibrator 5 acts on each
other to operate in the opposite phase, so as shown in FIG. 1, the gap bi (i between the magnetic
circuit or the suspension 4 and the vibrator 5) = 1, 2, 3, ..., n) is provided larger than each portion
a of the gap between the magnetic circuit and the cover A9 in consideration of the amplitudes of
the magnetic circuit and the vibrating body 5 (a <bmin), The magnetic circuit or suspension 4
and the vibrating body 5 are structured to avoid contact.
[0023]
As an example in the present invention, in a multi-function actuator in which a predetermined
vibration acceleration is generated in the vicinity of a resonance of a vibration mode with an
outer diameter dimension φ 17 mm and a height dimension t 4.3 mm, Since the amplitude of the
magnetic circuit is 50 μm and the amplitude of the magnetic circuit is about 600 μm, the gap
between the magnetic circuit or suspension 4 and the vibrator 5 is 50 + 600 + α μm and the
gap between the magnetic circuit and the cover A9 is 600 + α μm with an allowance of + α.
[0024]
The structure of the magnetic circuit may be either an external magnet type or a radial structure
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in addition to the internal magnet type structure of FIG.
Further, the front end portion of the yoke 1 of the magnetic circuit is formed into a shape such as
a projection or an unevenness so as to easily generate a high magnetic flux density even in an
internal magnet type or an external magnet type.
The direction of the magnetic poles of the permanent magnet 2 may be either direction.
The suspension 4 is integrated with the vibration transmitting unit 8 by insert molding, welding,
adhesion, and the like.
[0025]
The vibrating body 5 may have any plate thickness such as planar, plate-like, curved, corrugation
or a combination of each, and in the case of curved, a combination of a single curvature or
different curvatures, and the inner side of the coil 6 By avoiding the contact between the
magnetic circuit or the suspension 4 and the vibrating body 5 in the vibration mode by making
the curvature shape to increase the rigidity of the vibrating body 5 to minimize the harmonic
distortion component, the predetermined in the acoustic mode. The acoustic characteristics of
are obtained.
The vibrating body 5 is formed of polyether imide (PEI).
Other plastic film materials such as polyethylene terephthalate (PET), polycarbonate (PC),
polyphenylene sulfide (PPS), polyarylate (PAR), polyimide (PI) and aramid (PPTA) could be used
as well.
Further, the outer peripheral portion of the vibrating body 5 is coaxially attached to the vibration
transmitting portion 8 through an elastic material such as a pressure sensitive adhesive, an
adhesive or a resin as necessary in order to obtain a larger amplitude of the vibrating body 5. ing.
The vibration transmitting portion 8 is made of a resin or the like that brings about an elastic
action.
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[0026]
A cover A9 and a cover B10 are provided on the vibration transfer unit 8 as protection of the
functional main body that causes vibration, and the cover A9 fixed to the vibration transfer unit 8
suppresses the nonlinear unstable operation of the vibrating body 5 In order to reduce harmonic
distortion components near the resonance frequency, one or more air damping holes 11 for air
viscosity damping of any diameter are provided, and a circle, an ellipse, an oval, a polygon or a
combination of each. Shape. In addition, it is necessary to be careful that there is no inflow and
outflow of air other than the air viscosity damping action sound emission hole 11.
[0027]
When a drive current is applied to the coil 6, the magnetic circuit flexibly supported by the
vibrator 5 and the suspension 4 fixed to the vibration transmission unit 8 vibrates. At this time,
the vibration transfer unit 8 is a fixed portion at low frequencies and an elastic member at high
frequencies to be a part of the vibrating body 5 and vibrates, and the coil 6 fixed to the magnetic
circuit and the vibrating body 5 It works and operates in reverse phase.
[0028]
As described above, according to the multi-functional vibration actuator of the present invention,
the gap between the magnetic circuit and the suspension and the vibrating body is larger than
the gap between the magnetic circuit and the cover, and the vibrating body is flat and plateshaped. Avoid contact between the magnetic circuit and the vibrating body near the resonance
frequency of the vibration mode by making it a plate, curved surface, corrugation or a
combination of each and any curvature shape that minimizes harmonic distortion components It
has become possible to provide a multifunctional vibration actuator that can
[0029]
Further, according to the multi-functional vibration actuator of the present invention, the coil
wire fixed to the vibrator is wound on the vibrator surface in a U-shape, a U-shape, a bellows
shape or a combination of each, By attaching it with an elastic material such as adhesive glued to
the position, it is possible to provide a multifunctional vibration actuator that suppresses
unstable operation in the acoustic mode and does not cause disconnection in the drive input
voltage and long-time drive etc. became.
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