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DESCRIPTION JP2003236467

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2003236467
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
small-aperture, small-sized, electro-acoustic transducer capable of generating a wide band from
bass to treble, and also relates to a vibration actuator capable of simultaneously outputting
bodily sensation vibration and music (voice). It is.
[0002]
2. Description of the Related Art Conventionally, a vibration actuator shown in FIG. 5 is used. FIG.
5 is a cross-sectional view of a vibration actuator according to an example of the prior art. As
shown in FIG. 5, the magnetic circuit composed of the yoke 101, the permanent magnet 102, and
the plate 103 is flexibly supported by the suspension 104 of an arc-shaped spiral plate spring
fixed to the vibration transmitting portion 108. The suspension 104 is fixed to the outer
peripheral portion of the yoke 101 of the magnetic circuit and the vibration transmitting portion
108. The coil fixing portion 109 provided on the diaphragm 105 has a concave shape, the coil
106 is fixed by an adhesive or the like, and the coil 106 is disposed in the air gap of the magnetic
circuit.
[0003]
Like the suspension 104, the diaphragm 105 is fixed to the vibration transfer unit 108, and when
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a drive current flows through the coil 106, the magnetic circuit or coil 106 moves up and down
in the axial direction, and the vibration transfer unit 108 is fixed at low frequencies. At high
frequency, it becomes an elastic body and vibrates as a part of the diaphragm 105. The magnetic
circuit and the diaphragm 105 operate in the vibration and acoustic modes while interfering with
each other to transmit the vibration to the outside. It is a structure. Reference numeral 107
denotes a central axis inserted through the central hole of the magnetic circuit. Further, a stopper
110 is provided in the vibration transfer unit 108, and the stopper 110 has a role of preventing
the magnetic circuit and the vibrating body 105 from colliding when an excessive power is
applied to the vibration actuator.
[0004]
By the way, the magnetic flux density of the air gap of the magnetic circuit becomes the largest
on the straight line connecting the yoke and the plate at the shortest, and becomes sharply
smaller as it goes away from the straight line.
[0005]
Therefore, it is ideal that the coil be disposed concentrated on the straight line connecting the
yoke and the plate at the shortest distance, in which case the driving force is the largest.
[0006]
However, in the case of the vibration actuator according to the prior art shown in FIG. 5, one end
of the coil 106 is disposed in the portion with high magnetic flux density, while one end is
disposed in the portion with low magnetic flux density.
[0007]
A part of the coil disposed in the portion where the magnetic flux density is small not only makes
a small contribution to the improvement of the driving force, but also makes the vibration of the
diaphragm small by its mass, thereby degrading the characteristics of the vibration actuator.
[0008]
These vibration actuators are small (for example, 18 mm and 15 mm diameter, 4 to 5 mm in
height) and are mainly used for mobile phones, but due to the ringing boom of so-called mobile
phones (so-called ringtones) The sound source includes bass from several hundred Hz to improve
the sound quality.
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In addition, as a function of notifying an incoming call of a mobile phone, a function of
simultaneously driving Melody Ringer in a state of operating a vibration mode is preferably used.
In previous mobile phones, the vibration mode was vibrated by the vibration motor, and the
ringtones were output by microspeakers and separate devices, so simultaneous output of
vibration and ringtones was not a problem, but recently cost reduction and space saving For this
purpose, mobile phones use vibration actuators that output vibration and sound with one device
and remove vibration motors.
[0009]
However, when simultaneous drive input of vibration and music is applied to the above-described
conventional vibration actuator (see FIG. 5), the magnetic circuit side operates up and down, that
is, the magnetic flux decreases with respect to the coil Since the coil vibrates due to the ringtone
signal and outputs music while repeating the increase, in the structure of FIG. 5 (long coil) in
which one end of the coil is removed from the plate, the low frequency as shown in the output
waveform of FIG. The music output has been modulated by the, and the tone quality of the
ringtone has been impaired.
FIG. 4 is a waveform measured by placing a microphone at a distance of 10 cm from the
vibration actuator.
[0010]
Therefore, the technical problem of the present invention is that it can output a wide range of
sound (music and voice) from bass to treble while having a small size and a small aperture, and
can realize a simultaneous drive mode of vibration mode and ringtone mode such as mobile
phones. It is an object of the present invention to provide a vibration actuator and an
electroacoustic transducer.
[0011]
SUMMARY OF THE INVENTION In order to solve the above problems, a vibration actuator
according to the present invention comprises a magnetic circuit comprising a permanent magnet,
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a yoke, and a plate used to concentrate the magnetic flux of the permanent magnet; A coil
disposed in an air gap of the magnetic circuit, a vibration plate to which the coil is attached and
to which a driving force is given by the coil, and a vibration transmitting portion for flexibly
supporting the magnetic circuit via a suspension made of a flexible spring. In the vibration
actuator having the electro-acoustic transducer, the position of the coil in the magnetic circuit
gap is substantially opposite to the plate.
[0012]
Further, in the vibration actuator according to the present invention, the coil length L1 is
characterized by substantially the same length as the thickness L2 of the plate, that is, L1 ≒ L2.
[0013]
Further, in the vibration actuator according to the present invention, the coil length L1 is
characterized by having a relationship of L1 <L2 with respect to the thickness L2 of the plate.
[0014]
Further, in the vibration actuator of the present invention, a concave coil fixing portion is
provided on the vibrating body, and the coil is embedded and fixed in the coil fixing portion.
[0015]
Further, in the vibration actuator according to the present invention, the coil is fixed to the
diaphragm by inserting the coil into the coil fixing portion, filling the filler into the coil fixing
portion and curing the filler.
[0016]
Further, in the vibration actuator of the present invention, the filler completely covers the coil.
[0017]
In the vibration actuator according to the present invention, the filler is filled in the lead wire
lead-out portion of the coil so that the filler does not touch.
[0018]
Further, in the vibration actuator of the present invention, the filler is characterized in that the
coil fixing portion is almost completely filled.
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[0019]
Further, in the vibration actuator according to the present invention, in any one of the vibration
actuators, the filler is an ultraviolet curable resin.
[0020]
In the vibration actuator according to the present invention, a magnetic circuit comprising a
permanent magnet, a yoke, and a plate used to concentrate magnetic flux of the permanent
magnet, a coil disposed in an air gap of the magnetic circuit, and the coil A vibration actuator
comprising: an electro-acoustic transducer comprising: a diaphragm attached to which a driving
force is given by the coil; and a vibration transmitting portion for flexibly supporting the
magnetic circuit via a suspension made of a flexible spring. The present invention is
characterized in that it is possible to simultaneously generate a sound and a vibration by
simultaneously inputting a low frequency signal fv for generating a signal and a signal of a
higher frequency than the signal fv for generating a sound.
[0021]
Here, in the present invention, sound refers to what is felt by hearing and vibration refers to what
is felt and felt by tactile sensation such as bodily sensation vibration.
[0022]
In the vibration actuator according to the present invention, a magnetic circuit comprising a
permanent magnet, a yoke, and a plate used to concentrate magnetic flux of the permanent
magnet, a coil disposed in an air gap of the magnetic circuit, and the coil A vibration actuator
comprising a vibration plate attached to which a driving force is given by the coil, and a vibration
transmission unit for flexibly supporting the magnetic circuit via a suspension made of a flexible
spring. The magnetic circuit vibrates due to a wide band input signal ranging from high
frequency to high frequency, and both the diaphragm and the magnetic circuit vibrate so as to
vibrate the bass and the medium, and the diaphragm vibrates to generate high frequency. It is a
two-way type or three-way type electro-acoustic transducer characterized by the above.
[0023]
Here, in the present invention, the bass is preferably a deep bass.
[0024]
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That is, more specifically, in the vibration actuator of the present invention, by applying a wide
band signal to the coil, the coil in the magnetic circuit vibrates, or the magnetic circuit vibrates,
or both the coil and the magnetic circuit vibrate. In a vibration actuator which transmits vibration
to the outside through a support and transmits it as an acoustic output due to air vibration by
vibration of a diaphragm, simultaneous output of vibration and sound is possible.
[0025]
This provides a non-conventional medium that enables information transmission (such as
emotions) with sounds and vibrations (hearing, tactile sense) that are not in the prior art.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0027]
FIG. 1 is a cross-sectional view of a vibration actuator according to an embodiment of the present
invention.
Moreover, FIG. 2 is an example of the sound pressure characteristic which measured and
compared the conventional vibration actuator and the vibration actuator of this invention with
the microphone 10 cm apart.
[0028]
Referring to FIG. 1, in the vibration actuator according to the embodiment of the present
invention, a magnetic circuit is formed by a yoke 31 and a plate 33 so as to sandwich a diskshaped permanent magnet 32, and has an inner magnetic structure.
A central shaft 37 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 31, the permanent magnet 32, and the plate 33
coaxially.
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The suspension 34 flexibly supports the magnetic circuit with a single arc-shaped spiral leaf
spring, and is fixed to the outer peripheral portion of the yoke 31 by an elastic material such as
an adhesive, an adhesive, or a resin, or caulking. One end is fixed to the vibration transmission
unit 38.
[0029]
On the other hand, the coil 36 is fixed to a vibrating plate 35 in which a coil fixing portion 39
having a concave shape is formed, fixed by an adhesive or the like as necessary, and disposed in
a gap of the magnetic circuit.
[0030]
The coil length L1 is a so-called short coil type in which L1 is substantially equal to the plate
thickness L2 or L1 <L2.
[0031]
Further, the vibration transmitting portion 38 is provided with a stopper 40, and the stopper 40
has a role of preventing the magnetic circuit and the vibrator from colliding when an excessive
power is applied to the vibration actuator.
[0032]
The structure of the magnetic circuit may be an external magnet type or a radial structure in
addition to the internal magnet type structure of FIG.
Further, the tip of the yoke 31 of the magnetic circuit is formed into a shape such as a projection
or an unevenness so that high magnetic flux density is easily generated even in the internal
magnetic type or the external magnetic type.
The direction of the magnetic poles of the permanent magnet 32 may be either direction.
[0033]
The suspension 34 is integrated with the vibration transmitting portion 38 by insert molding,
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welding, adhesion or the like.
[0034]
The diaphragm 35 has an arbitrary plate thickness by a flat shape, a plate shape, a curved
surface, a corrugation or a combination of each, and in the case of a curved surface,
predetermined acoustic characteristics by a combination of single curvature or different
curvatures. It is made to be obtained.
In addition, the outer peripheral portion of the diaphragm 35 is fixed to the vibration
transmission unit 38 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 diaphragm 35.
[0035]
The vibration transmitting portion 38 is made of a resin or the like which brings about an elastic
action, and a sound emitting hole is optionally provided to satisfy the principle of the Helmholtz
resonator, and at this time there is no inflow and outflow of air other than the sound emitting
hole. Provided in
[0036]
The vibration actuator of the present invention thus configured is a so-called short coil type in
which the coil length L1 is approximately equal to the plate thickness L2 or L1 <L2, and is at the
point where the maximum magnetic flux in the air gap of the magnetic circuit is concentrated.
Since the coil is disposed, a high sound pressure of 10 dBspl or more is shown in acoustic
characteristics as shown in FIG. 2 with respect to the conventional vibration actuator (long coil
type).
[0037]
Further, in the vibration actuator according to the present invention, for example, for
simultaneous signal input of vibration and ringtone, even if the magnetic circuit operates and
vibrates, the coil disposed in the magnetic circuit gap does not greatly deviate from the maximum
magnetic flux density position. There is no adverse effect of low frequency modulation due to the
operation of the magnetic circuit, and the vibration mode and the ringtone can be operated at the
same time because the ringtone output is not impaired.
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[0038]
FIG. 3 is a view showing an example in which an output waveform when a low frequency
vibration and an acoustic signal are simultaneously input to the vibration actuator of the present
invention is measured by a microphone 10 cm apart.
Compared with the waveforms of the conventional vibration actuator shown in FIG. 4 from the
comparison of FIG. 3 and FIG. 4, the influence of the low frequency of the present invention
shown in FIG. It turns out that simultaneous operation of vibration mode and ringtone is possible.
[0039]
Now, when a single frequency signal of around 100 Hz is input to the coil 36, the coil 36 is in the
air gap of the magnetic circuit, so according to Fleming's left-hand rule, the coil 36 and the
magnetic circuit are relatively synchronized to the input frequency Vibration occurs, and the
vibration is output to the outside via the vibration transmission unit 38.
This is a sensational vibration and is a bass (heavy bass) as a sound.
[0040]
Next, when a single frequency of about 2 KHz is input to the coil 36, the coil 36 and the magnetic
circuit vibrate in synchronization with the input frequency, and the vibration of the coil 36 is
transmitted to the diaphragm 35 to vibrate the diaphragm 35. Because the frequency is high, it
enters the human audible range and sounds as a sound.
At this time, the vibration of the magnetic circuit is simultaneously transmitted through the
vibration transmission unit.
[0041]
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Furthermore, when a voice (or music) signal of hundreds to thousands of HZ is input to the coil
36, the diaphragm 35 vibrates in a similar manner, but since the diaphragm is a diaphragm film
(or cone paper), the vibration actuator It will output voice (or music) like a normal speaker.
As described above, since the vibration of the vibration actuator has wide-band frequency
characteristics (spectrum), the sound (spectrum) output and the vibration (spectrum) output can
be performed. Compared to being able to produce only, it can output a great variety of
expressions simultaneously with sound and vibration.
[0042]
Alternatively, the tune can be accented by synchronizing the vibration resonance fv0 consisting
of the weight of the magnetic circuit of the vibration actuator and the spring constant of the
suspension with the musical bass.
[0043]
As described above, according to the present invention, the relationship between the coil length
L1 and the plate thickness L2 is set to L1 2 L2 according to the present invention, with the
arrangement of the coils formed on the vibrator facing the plate. The output sound pressure of
the sound output from the vibration actuator can be improved, and a vibration actuator capable
of simultaneously driving the vibration mode and the ringtone mode can be provided, for
example.
[0044]
Furthermore, according to the present invention, it is possible to provide a 2 way (3 way) speaker
type electroacoustic transducer capable of outputting a single device from bass (heavy bass) to
high tones as a compact audio system.
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