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JP2003033724

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DESCRIPTION JP2003033724
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is
incorporated in a mobile communication device such as a mobile phone or a pager to notify a
user of an incoming call by vibration, or incorporated in a small portable terminal or small game
machine etc. The present invention relates to an electric-mechanical vibration converter that
makes
[0002]
2. Description of the Related Art In order to notify the user of an incoming call, these portable
devices are switched to use whether to emit a buzzer or a melody or to generate vibrations
without producing a sound in consideration of the surroundings. Generally, it has been designed
to incorporate a sound generator for generating sound and an electro-mechanical vibration
converter for generating vibration. Among them, the sound producing body is a small speaker or
a buzzer, while the electric-mechanical vibration converter (hereinafter referred to as a vibrator)
has an eccentric rotating body fixed to the rotation shaft of a small motor. An example of such a
vibrator is found in, for example, Japanese Patent Application Laid-Open No. 7-107699, and
when the motor is started by an incoming signal, the eccentric rotating body is rotated to
generate vibration due to the imbalance.
[0003]
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1
SUMMARY OF THE INVENTION In the vibrator as described above, the motor is composed of
parts such as a stator and a rotor, which is complicated in structure and expensive, and the
combination of the motor and the eccentric rotator has a volume. May be too large to use in
small devices. Further, since the motor is a DC motor, there is a problem that the rotational speed
is uniform and only monotonous vibration can be obtained. The present invention solves these
problems, and realizes a vibrator that is simple in structure and extremely small, and can
generate musical vibrations accompanied by rhythm, strength and the like.
[0004]
SUMMARY OF THE INVENTION In order to solve the above problems, in the present invention, a
permanent magnet and a yoke or pole piece are combined to form a magnetic circuit portion
having a magnetic gap, and a coil is formed in the magnetic gap. Place. The coil is fixed to the coil
support plate, while the magnetic circuit portion is elastically and vibratably supported by a
suspension which is a support spring. With this structure, if an alternating signal current is
supplied to the coil, the coil is stationary due to the electromagnetic action of the magnetic field
of the magnetic gap of the magnetic circuit unit and the current of the coil, and the magnetic
circuit unit vibrates as a weight. If the signal current is musical, including rhythm, strength and
so on, it is reproduced and transmitted to the user.
[0005]
In the present invention, the mass of the magnetic circuit portion is made as large as possible to
increase the vibrational energy of the magnetic circuit portion. That is, components of the
magnetic circuit portion are provided with excess thickness more than necessary for forming a
magnetic path to make a weight, or a weight of a high specific gravity material is made to be
added separately.
[0006]
DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be
described below based on the drawings. FIG. 1 is a sectional view of an embodiment of a vibrator
according to the present invention, in which a magnetic circuit portion and a coil are
accommodated in a frame 1 made of plastic or the like. The magnetic circuit portion has an
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2
annular magnet 3 fixed on the flange 2a of the pole piece 2 of magnetic material, and an annular
top plate 4 is also fixed to the upper end of the magnet 3 with a magnetic material. A magnetic
field is generated in the magnetic gap between the inner periphery of the top plate 4 and the
outer periphery of the upper end of the center pole 2b of the pole piece 2 by the magnetomotive
force of the magnet 3, and the coil 8 is disposed in this magnetic gap.
[0007]
The magnetic circuit portion of the pole piece 2, the magnet 3 and the top plate 4 is supported
on the frame 1 by the upper suspension A (5) and the lower suspension B (6). Although the frame
1 is shown as an integral structure in FIG. 1 for the sake of simplicity, there are also cases where
two frames are made separately and joined for convenience of insert-molding two suspensions.
On the other hand, the coil 8 is fixed to a coil support plate 7 such as plastic, and the coil support
plate 7 is joined to the frame 1. A protector 10 is joined to the lower surface of the frame 1 and
provided with a plurality of vent holes.
[0008]
When an alternating signal current is supplied to the coil 8 in such a configuration, the magnetic
circuit portion and the coil both receive an alternating force by mutual electromagnetic action,
but the coil 8 is fixed to the coil support plate 7. The magnetic circuit portion elastically
supported by the suspensions A and B (5, 6) vibrates. Then, this vibration is transmitted to the
casing of the portable device incorporating the vibrator to make the carrier sense the vibration. If
the signal current supplied to the coil 8 is a simple sine wave or the like, the vibration is also
simple, but if it is a music signal or the like, the vibration is accompanied by rhythm or strength.
[0009]
As to the elastic support of the magnetic circuit portion, although it is basically sufficient if there
is only one of the two suspensions A and B (5, 6), there is an asymmetry or failure of parts with
one. Due to the balance or the like, the magnetic circuit portion may be inclined during vibration
to contact the coil 8, which may cause abnormal noise or damage. As shown in FIG. 1, when the
upper and lower suspensions A and B (5, 6) are supported, the magnetic circuit portion does not
tilt and operates stably.
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[0010]
In order to obtain maximum vibrational energy with such a small vibrator, it is desirable to
maximize the mass of the magnetic circuit portion. Therefore, in the present invention, as shown
in FIG. 1, the center pole 2b of the pole piece 2 is made cylindrical with a thickness necessary for
the passage of the magnetic flux, and a weight 9 is filled in the hollow portion. The material of
the weight 9 preferably has a high specific gravity, and tungsten is used as an example. In this
figure, the hollow portion of the center pole 2b is provided with a ceiling, but of course it may be
a through hole.
[0011]
FIG. 2 is another embodiment of the present invention. While the one in FIG. 1 is a so-called
external magnet type in which the annular magnet 3 is disposed outside the coil 8, the one in
FIG. 2 is an internal magnet type in which the short cylindrical magnet 12 is disposed inside the
coil 8. It is. The magnet 12 is fixed to the bottom 11 a of the magnetic yoke 11, and the top plate
13 of the magnetic material is joined to the upper end of the magnet 12. The coil 8 is disposed in
the magnetic gap between the inner periphery of the upper end portion of the outer peripheral
portion 11 b of the yoke 11 and the outer periphery of the top plate 13, and the coil 8 is fixed to
the coil support plate 7. Here too, the magnetic circuit portion is supported on the frame 1 by the
upper and lower two suspensions A and B (5, 6).
[0012]
The operation is the same as that described above, and when a signal current is applied to the
coil 8, the elastically supported magnetic circuit vibrates to transmit the vibration to the wearer.
Here too, in order to increase the vibrational energy, it is devised to increase the mass of the
magnetic circuit portion. That is, the outer peripheral portion 11b of the yoke 11 is thickened as
much as possible to increase the weight as shown in the drawing even if the outer diameter
required to form the magnetic path is up to the two-dot chain line 14. It is more effective to
separately make the outside portion of the two-dot chain line 14 of a material having a higher
specific gravity than that of the yoke, such as tungsten, and fix it to the yoke 11.
[0013]
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FIG. 4 is a block diagram of the sound and vibration generating mechanism of a small portable
device incorporating a motor with an eccentric weight described in the prior art as a vibrating
body. When a signal received by the antenna 21 enters the received signal processing unit 22, an
incoming signal is output, and the motor drive circuit 25 or the music signal generating unit 26
is operated according to the setting of the user. When set to use in the acoustic mode, the music
signal generation unit 26 is started to output a music signal, and the speaker 27 or the buzzer Bz
is driven through the amplifier 27 to generate a melody or a buzzer sound. When used in the
vibration mode, the motor drive circuit 25 is started to rotate the DC motor M, and the eccentric
weight attached to this rotates to generate vibration. The received signal output from the
received signal processing unit 22 passes through the amplifier 23 to drive the receiver 24 to
reproduce voice.
[0014]
FIG. 3 is a block diagram of the sound and vibration generating mechanism of the small portable
device using the vibrator of the present invention. The reception signal processing unit 31
includes an oscillation circuit including a quartz oscillator 32, and generates a sine wave
vibration φ. When the reception signal processing unit 31 outputs an incoming signal, if the
sound mode is selected, the music signal generation unit 35 is started to output a music signal,
and the amplifier 28 passes through the speaker 28 (or a buzzer (not shown)). Etc.) to generate
melody and buzzer sound. When the receiving state is entered, the receiving signal output from
the receiving signal processing unit 31 drives the receiver 24 via the amplifier 33.
[0015]
On the other hand, when responding to the incoming signal in vibratory mode, several actions
are possible. That is, it is the first to vibrate the vibrator V at a frequency of 80 to 200 Hz which
is obtained by dividing the oscillation output φ of the crystal oscillator 32 by the divider 34. This
may be to continue the vibration uniformly. The logical product of the waveform and the square
wave may be taken and intermittently oscillated. Next, the music signal generated by the music
signal generation unit 35 is passed through the low pass filter 36 and driven with a low
frequency component with a rhythm. Furthermore, it is the third one to drive the music signal
through the signal strength detector 38 with strength. These drive signals are switched by the
switch SW, amplified by the amplifier 37 and applied to the vibrator V. Such various operation
modes can not be obtained by the conventional structure of FIG.
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[0016]
As apparent from the above description, the present invention has a simple structure and low
cost, and has a small volume and a small size portable as compared with a conventionally used
motor and a vibrating body with an eccentric mass. Since a high specific gravity material or
weight is added to the magnetic circuit portion which is suitable for equipment and which
becomes a vibration mass, vibration energy can be increased even with a small size, and various
effects such as various operation modes of vibration can be obtained. This makes it possible to
obtain an inexpensive vibrator suitable for use in a vibration mode in a cellular phone or the like,
and is also suitable for giving a sense of presence by vibration in a game program or the like.
[0017]
Brief description of the drawings
[0018]
1 is a cross-sectional view of an embodiment of the electro-mechanical vibration transducer of
the present invention.
[0019]
2 is a cross-sectional view of another embodiment of the electro-mechanical vibration transducer
of the present invention.
[0020]
3 is a block diagram of the sound and vibration generating mechanism of a small portable device
incorporating the electro-mechanical vibration converter of the present invention.
[0021]
4 is a block diagram of the sound and vibration generating mechanism of a small portable device
incorporating a conventional motor with eccentric weight.
[0022]
Explanation of sign
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[0023]
Reference Signs List 1 frame 2 pole piece 2a flange 2b center pole 3, 12 magnet 4, 13 top plate
5 suspension A 6 suspension B 7 coil support plate 8 coil 9 weight 10 protector 11 yoke 21
antenna 22 31 received signal processing unit 23, 27, 33 37, 39 amplifier 24 receiver 25 motor
drive circuit 26, 35 music signal generator 28 speaker 32 crystal oscillator 34 divider 36 low
pass filter 38 signal strength detector Bz buzzer M motor SW switch V vibrator
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