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DESCRIPTION JP2000334377

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DESCRIPTION JP2000334377
[0001]
BACKGROUND OF THE INVENTION The present invention is designed to output low-frequency
vibration to an electro-acoustic transducer which is built in a portable telephone or the like and
emits voice for calling upon signal incoming, so that calling can also be performed by vibration. It
is an electric vibration converter used to make it known, and can be used particularly for the
purpose of making it small and light.
[0002]
2. Description of the Related Art A conventional vibration actuator for a pager, also referred to as
a vibration motor for a pager or a vibration generating actuator, needs to be small, thin, capable
of generating vibration with low power consumption, and inexpensive. However, in order to
generate only vibration, it is of course not possible to make a voice call or to make a speech
sound. Therefore, at least two or more device parts are required for incoming call information
and voice generation. Moreover, the vibration actuator for pagers used frequently has a large
start-up power consumption in order to rotate a relatively large mass. Furthermore, the number
of parts increases due to the configuration to be rotated, and there are problems with reliability
and accuracy management. Since a brush for current switching is used for the reason of using a
direct current, operation failure may occur during rotation, and there is a limit to miniaturization
and flattening.
[0003]
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1
FIG. 15 shows a pager vibration motor which is most commonly used conventionally. The
counterweight 47 is rotated via a shaft 46 driven by a drive motor 45 composed of a cylindrical
coreless rotor to generate a whirling vibration. Naturally, no sound other than vibration can be
generated. The drive motor 45 is formed of a curved permanent magnet or a cylindrical coreless
rotor, and it is necessary to form a plurality of magnetic poles in order to obtain a rotational
drive force, and in order to realize the thin diameter drive motor 45 There is a limit in
management and production cost.
[0004]
FIG. 16 shows the state of vibration of the cylindrical vibration motor for a pager. The counter
weight 47 swings around the center of rotation 48 by the rotation by the drive motor 45. Since
the direction of vibration occurs in any direction, depending on the method of fixing the pager
vibration motor, there is a direction in which the vibration is not effectively transmitted to the
outside, and the swinging moment is proportional to the square of the rotation speed of the drive
motor 45 There is a limit of power saving because of the need for starting power.
[0005]
FIG. 17 is a perspective view showing the inside of a pager vibration motor 49 configured of a
conventional flat coreless rotor. A disk-shaped winding coil 50 whose center of gravity is
eccentrically provided on the rotation shaft 52 is provided to generate a rotational driving force
with the thin plate permanent magnet 51. The drive current is supplied from the brush 53.
Unlike the cylindrical type, in place of the counterweight, a winding coil having a decentered
center of gravity is used. Vibration occurs during rotation. Of course, I can not play voice. In
addition, it is difficult to form a flat shape of several mm or less with an outer size of 20 mm or
less.
[0006]
FIG. 18 shows the most effective vibrational state of the flat pager vibration motor, and the
rotational state in the axial direction with respect to the vibration center shaft 54 is shown by 55,
56, 57 of the pager vibration motor main body. . There are also thickness vibration in the axial
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direction and vibration with a diameter in the direction perpendicular to the shaft, but depending
on the way of fixing the flat type vibration motor for a pager, it often does not contribute much
to the generation of external vibration. . This means that the drive current applied to the winding
coil is not effectively utilized as vibration energy to the outside.
[0007]
FIGS. 19 and 20 show a vibration actuator for a pager which is not put into practical use but is
different in principle of vibration generation. As disclosed in JP-A-4-355641, a magnetic circuit is
formed by permanent magnets 61 or 65 magnetized in the thickness direction and
electromagnetic coils 60 or 64, and a support 59 is provided at the center of the nonmagnetic
housing 58. The movable plate 59 supported is oscillated up and down by an AC excitation
current flowing through the electromagnetic coil 60 or 64 to generate a vibration. The feature is
that the external dimensions can be reduced, but the generated vibration is absorbed by the
movable plate 59 and the periphery and the energy transmitted to the outside is small.
[0008]
SUMMARY OF THE INVENTION The conventional vibration actuator for a pager can generate
vibration but can not generate sound. In addition, the start-up power can not always be reduced,
and it has been quite difficult to reduce the external dimensions, and there have also been cases
in which rotational operation failure is likely to occur.
[0009]
An object of the present invention is to provide an electro-acoustic transducer capable of
generating vibration and sound and effectively converting drive current into vibration energy,
and it is easy to make, easy to flatten, vibration for pager having no malfunction. An object of the
present invention is to provide an electromechanical acoustic transducer suitable as an actuator.
[0010]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
comprises a magnetic circuit comprising an annular magnetic gap comprising a permanent
magnet and a yoke, and arranging a coil in the magnetic gap, the coil The vibrator is attached to
the coil, and an alternating current electrical signal is supplied to the coil to cause the vibrator
and the magnetic circuit to vibrate relative to each other, wherein the vibrator is supported by
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the damper at the yoke portion. It is an electrical vibration converter characterized in that
[0011]
The vibration converter is characterized in that the relative vibration is transmitted to the yoke
when the alternating current electrical signal is a low frequency signal lower than an audio
frequency.
[0012]
Further, the vibration converter is characterized in that, when the alternating current electrical
signal is a high frequency sound signal, the vibrating body vibrates to generate a sound.
[0013]
The electric vibration converter is attached to the portable telephone through the magnetic
circuit, and when the alternating current signal is a low frequency signal than the audio
frequency, the relative vibration is transmitted to the portable telephone and the alternating
current signal is transmitted. The vibrator is used as a vibration actuator for a pager
characterized in that the vibrator vibrates to emit a sound when it is a high frequency sound
signal.
[0014]
When the electric vibration converter is used as a vibration actuator for a pager, the coil is
cylindrical and is wound around a bobbin whose upper portion is bent inward, and the damper
and the vibrating body are bonded to the bending portion of the bobbin It is characterized by
[0015]
When the electric vibration converter is used as a vibration actuator for a pager, the vibrator is a
vibrator formed in a dome shape.
Thereby, the strength of the vibrator can be increased.
[0016]
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When the electric vibration converter is used as a vibration actuator for a pager, a weight plate is
bonded to the vibrator via a light elastic material.
As a result, it is possible to prevent the displacement of the coil at the time of vibration due to
external vibration from becoming large, and it is not necessary to add mass at the time of sound
generation.
[0017]
Furthermore, according to the present invention, a permanent magnet and a yoke form a
magnetic circuit having a magnetic gap, and a coil is wound around the magnetic circuit, and a
magnetic material is disposed in the vicinity of the magnetic gap and the magnetic material plate
is mounted on the yoke. Supported by a vibrator supported on the magnetic circuit, an
alternating current electric signal is supplied to the coil, and the magnetic material plate is
attracted and repelled against the magnetic circuit by the alternating current magnetic field from
the coil and the direct current magnetic field from the permanent magnet A relative vibration is
caused between the material plate and the vibrator and the magnetic circuit, and when the AC
signal is an audio signal, the vibrator is vibrated to generate sound, and the AC signal is a low
frequency lower than an audio frequency. An electromagnetic type electric vibration converter is
obtained, characterized in that it has a configuration for transmitting the relative vibration to the
support when it is a signal.
[0018]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention
will be described based on examples with reference to the drawings.
[0019]
FIG. 1 shows an example of a vibration actuator for a pager according to the present invention,
which uses a moving coil type electroacoustic transducer that generates sound.
The vibrating body 1 is formed into a dome shape by a light aluminum alloy plate or the like, and
it is difficult to be bent at the time of vibration so that a good sound can be generated.
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In order to support the central position and the upper and lower positions of the vibrator 1, it is
bonded to the damper 7 which can be relatively softly displaced in the vertical direction.
Further, a cylindrical coil 3 in which a conductor fine wire is wound a plurality of times is formed
on the outer periphery of the bobbin 9.
The upper portion of the bobbin 9 is bent at a right angle to the inner side, so that the bonding
between the vibrating body 1 and the damper 7 can be strengthened, and an annular flat portion
8 is formed.
In the magnetic circuit, a plate 6 of a disk-like magnetic body is bonded to one pole of a
permanent magnet 4 magnetized in the thickness direction with a columnar open hole at the
center, and the other pole is formed and processed. It is configured by bonding the plate yokes 5.
An annular gap in which the coil 3 and the bobbin 9 move up and down is formed between the
yoke 5 and the plate 6 to form a space having a large magnetic flux density. In the case of voice,
the frequency is as high as several hundred hertz to 3 kilohertz, and even if a relatively large
drive current enters coil 3, the amount of displacement of vibrating body 1 is relatively small,
and damper 7 supports Do. In the case of driving at a low frequency of several tens of hertz, the
displacement of the vibrating body 1 becomes large and the collision with the collision part 2
occurs. The annular flat portion 8 of the vibrating body 1 or the like colliding with the collision
portion 2 is structurally strong and collides on average. The vibration generated by the collision
is transmitted through the support beam 12 and is further propagated from the outer peripheral
portion 10 to the outside. A central hole 13 is provided in the plate 6 and a plurality of holes 14
are provided in the yoke 5 so as not to raise the back pressure of air when the vibrator 1 and the
damper 7 vibrate at low frequency. The cross sectional structure is shown in FIG.
[0020]
If you want to generate a voice to notify the arrival of the signal or the other party's
conversational sound, realize it with a vibration of several hundred hertz to 3 kilohertz of the
vibrator 1, and when notifying the incoming signal by a vibration, the vibrator 1 with several tens
of hertz It drives and transmits collision vibration with the collision part 2 to the outside. The
vibration direction at this time is only the vertical direction, and vibration energy can be
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efficiently taken out to the outside. In addition, in order to suppress the generation of sound at
the time of collision, and to soften the impact of the collision and make it difficult to be damaged,
it is preferable to provide the collision portion 15 of an elastic material such as rubber as shown
in FIG.
[0021]
Also, it is possible to detect external vibration, as opposed to generating voice or vibration. When
external vibration of the component in the vibration direction of the vibrating body 1 or the coil
3 is applied, the magnet 4, the plate 6, the yoke 5 and the fixed frame 11 move integrally while
the vibrating body 1 or the coil 3 passes the damper 7. It moves late because it is easy to displace
up and down. The relative velocity at this time generates an electromotive force at both terminals
of the coil 3. By detecting this, it is possible to determine the presence or absence of external
vibration, that is, whether the mobile phone is stationary or moving. For this purpose, it is also
possible to increase the number of turns by increasing the number of turns or to increase the
weight by increasing the number of windings in a configuration without a bobbin as in the
vibrating portion, in particular the coil 16 in FIG. effective. However, the conversion efficiency to
voice for electrical input is disadvantageous.
[0022]
When the vibration actuator for a pager of the present invention is used for the purpose of sound
generation, it is necessary to make it a good electroacoustic transducer for sound without
sacrificing the function as the vibration actuator for a pager. FIG. 4 is a cross-sectional view when
the pager vibration actuator of the present invention is attached to a portable telephone. The
vibration generated by the collision when driven at a low frequency is transmitted through the
earpiece 22 and sensed by the human body. As a measure for generating the voice, the first
damping member 18 is provided in the center hole 13 and the second damping member 19 is
provided in the hole 14 to suppress resonance when the vibrating body vibrates and make it easy
to listen to the voice. Do. The first front air chamber 21 in the space formed by the vibrator 1 and
the earpiece 22 is connected to the second front air chamber 24 which is a space formed
between the earpiece 22 and the ear through the plurality of small holes 23 of the earpiece 22.
The second front air chamber 24 is not sealed, and changes depending on how the ears touch. A
space formed between the vibrator 1 and the magnetic circuit is a first back air chamber, and a
space formed inside the portable telephone is represented by a second back air chamber 20,
which is larger than other air chambers.
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[0023]
FIG. 5 is a diagram showing an acoustic equivalent circuit of FIG. 4 which is a cross-sectional
view of a configuration in which the pager vibration actuator of the present invention is used as
an electro-acoustic transducer for sound generation. M0, S0, R0 represent the mass, stiffness and
resistance of the vibrator, and AI represents the driving force when a current I flows. M1 and R1
indicate the mass at the hole 13 and the resistance of the first braking material 18 and the
second braking material. R2 and M2 represent the resistance and mass of the small hole 23 of
the earpiece 22. S1, S2, S3 and S4 represent the stiffness of the space of the first back air
chamber 17, the second back air chamber 20, the first front air chamber 21 and the second front
air chamber 24, respectively, and the larger the volume, the smaller the value. Become.
[0024]
FIG. 6 shows the output sound pressure characteristics of the frequency of the moving coil type
electroacoustic transducer. The resonance peak 25 corresponds to the case where there is no
damping material resistance R1 in FIG. 4, and the peak disappears by adding an appropriate
damping resistance R1. Since S4 of the second front air chamber 24 is not constant, the
characteristic 27 is exhibited when sealed, and the characteristic 26 is exhibited when open. In
order to hear the sound clearly, adequate damping and a relatively low resonance frequency are
required. The resonance frequency is determined in proportion to a half power of S0 / M0, but if
M0 is increased, S0 needs to be increased in order to position, and there is not much freedom. It
is necessary to increase the area of the vibrating body 1 to add an acoustic mass to the vibrating
body 1 to effectively increase M0. Incidentally, in order to set the resonance frequency to about
200 to 300 Hz, it is necessary to set the diameter including the damper 7 to about 25 mm. The
valleys 28 and the asperities 29 in FIG. 6 are caused by the divided vibration of the vibrating
body 1 and the like, and the voice becomes clear if possible from 2 kHz to 3 kHz or more.
[0025]
Even when the pager type vibration actuator of the present invention is positively used as a
vibration detection sensor, the purpose of generating voice and vibration should not be
sacrificed. FIG. 7 shows a partially cutaway perspective view of another embodiment. A weight
plate 32 having a large specific gravity is provided via the light elastic material 30 at the bonding
portion of the vibrator 1, the bobbin 31 and the damper 7. When a low frequency vibration is to
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be generated by a collision or when an external vibration is to be detected, the mass of the
weight plate 32 is added to the mass of the vibrating body 1 or the coil 3 that vibrates. At
relatively high frequencies of several hundred hertz to several kilohertz that handle speech, the
weight plate 32 hardly moves together with the coil 3 and approaches a stationary state.
Referring to the acoustic equivalent circuit of FIG. 9, M5 and R5 are the mass and resistance of
the weight plate, and S5 is the stiffness of the light elastic material 30. This is because the
resistance by S5 is large at low frequencies, and the resistance by S5 is low at high frequencies.
Incidentally, 2Z is an acoustic impedance added to both sides of the vibrating part.
[0026]
Another embodiment of a vibration actuator for a pager according to the present invention is
shown in FIG. The collision part 33 does not collide with the vibrating body 1 itself, but collides
with the bobbin 31 of the winding core of the coil 3, and the vibration energy is transmitted
through the yoke 5 so that the human body senses it. At this time, part or all of the collision part
31 may be made of an elastic material. However, as compared with the one in which the vibrator
1 shown in FIG. 1 is caused to directly collide, the vibration energy is somewhat dispersed in the
weight of the magnet 4 and other parts, so the propagation to the outside is small.
[0027]
FIG. 12 shows another embodiment of the vibration actuator for a pager according to the present
invention when an electromagnetic type electroacoustic transducer is used. A magnetic circuit is
constituted by the cylindrical magnet 37 magnetized in the thickness direction, the yoke 38 and
the plate 39. The coil 40 is wound around the yoke 38 via the bobbin 41. The magnetic material
plate 36 is attracted and repelled by the direct current magnetic field by the magnet 37 and the
alternating current magnetic field from the coil 40, and the bonded vibrating body 35 is vibrated.
Sound is generated by this vibration, and is collided with the collision part 42 at a low frequency,
and the vibration is propagated to the outside by the support beam 43. The vibrating body 35 of
the electromagnetic type electroacoustic transducer needs to be stopped at an appropriate
position against the attraction force of the direct current magnetic field, so the vertical motion of
the vibrating body 35 becomes considerably hard. For this reason, a large amplitude at a low
frequency can not be obtained, and the distance from the collision part 42 is small, and accuracy
is required. There are also limitations in the application of vibration detection sensors.
[0028]
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FIG. 13 is a schematic circuit diagram of the vibration actuator for a pager according to the
present invention when it is used for voice and vibration generation. When the incoming signal is
detected by the wireless unit, the control circuit amplifies the low frequency transmission circuit
by the amplification circuit to generate vibration. Next, if necessary, an incoming signal of voice
is produced by an intermediate frequency transmission circuit. When the conversation starts, the
received speech processing circuit generates a speech sound.
[0029]
FIG. 14 is a circuit schematic diagram in the case of using the vibration actuator for pager of the
present invention as a voice, vibration generation and vibration detection sensor. The presence or
absence of external vibration from the vibration sensor is detected, and when the incoming signal
is detected by the wireless unit, the low frequency transmission circuit generates a vibration
when there is an external vibration, and the middle frequency transmission circuit when there is
no external vibration. Generate When the conversation starts, the received speech processing
circuit generates a speech sound.
[0030]
Since the present invention is configured as described above, the following effects can be
obtained.
[0031]
In particular, when a moving coil type electroacoustic transducer is used, it is possible to
generate high quality sound and to generate external vibration at a low frequency.
[0032]
The vibration body moves in the vertical direction only and collides to generate vibration, so that
vibration energy can be effectively extracted.
In addition, since the starting power is also relatively small, power consumption can be reduced.
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[0033]
Furthermore, a mass integrated unit such as a vibrator, coil or bobbin, which is easy to move in
the vertical direction by the damper, moves due to the vibration of the vertical component from
the outside, generates electromotive force in the coil, and can detect the presence of external
vibration .
[0034]
In addition, since the magnet, the yoke and the plate may be thin, the outer dimensions can be as
thin as about 5 mm.
The diameter of the outer circumference is determined by the relationship with the voice band,
but it is about 25 mm as a standard.
[0035]
In addition, the magnet does not have a curved magnetic pole, and the coil may be cylindrically
wound in the same direction, the yoke and the plate are also formed by press processing, the
assembly is easy, and the accuracy management is relatively easy.
[0036]
Furthermore, since there is no rotating part, there is no brush or bearing part, and the total
number of parts can be reduced.
Moreover, there is no fault that rotation does not start by the position of an electrical contact.
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