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JPH1066194

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DESCRIPTION JPH1066194
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electromechanical acoustic transducer attached to a portable terminal device such as a cellular
phone to notify an incoming call by vibration or sound.
[0002]
2. Description of the Related Art FIG. 15 shows a cross-sectional view of a conventional
electromechanical acoustic transducer. In the drawing, inside the housing 1, a yoke 5, an annular
magnet 3 and an annular yoke plate 4 constitute a magnetic circuit. The annular yoke plate 4 is
attached to the housing 1 via the damper 6. At the opening of the housing 1 is provided a
housing 2 having a bobbin 8 around which a voice coil 9 is wound, and the voice coil 9 is
positioned so as to enter the magnetic gap of the magnetic circuit. In the above configuration,
when an electrical signal is input to the voice coil 9, a driving force is generated in the voice coil
9. At the same time, a reaction force of the driving force is generated to vibrate the yoke 5 of the
magnetic circuit. The vibration of the yoke 5 is transmitted to the housing 1 via the damper 6 to
vibrate the housing 1.
[0003]
In order to increase the vibration level (amplitude) of the housing 1 in such a conventional
electromechanical acoustic transducer, it is necessary to increase the level of the input electric
signal or to increase the mass of the magnetic circuit.
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[0004]
SUMMARY OF THE INVENTION Portable terminal devices such as portable telephones are
required to be smaller and lighter.
Accordingly, also in the electromechanical acoustic transducer incorporated in the portable
terminal device, the miniaturization and weight reduction are required. In the above-mentioned
conventional electromechanical acoustic transducer, it is necessary to increase the mass of the
magnetic circuit or to increase the level of the electric signal input using a large battery, so the
device becomes large and it is difficult to reduce the weight. The
[0005]
SUMMARY OF THE INVENTION The electromechanical acoustic transducer according to the
present invention achieves small, lightweight and large vibration levels without increasing the
substantial mass of the electromechanical acoustic transducer by using a mechanical
transformer. be able to.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION The electromechanical acoustic transducer
according to the present invention is characterized in that the mechanical impedance of the
secondary side viewed from the primary side is the distance between the mechanical impedance
of the secondary side and the action point portion and the distance between the action point
portion fulcrum portion And at least one mechanical transformer converted by a mechanical
conversion ratio, the substrate portion is coupled to a fulcrum of the mechanical transformer,
and an electromechanical transducer for converting an electrical signal to a mechanical vibration
is mechanical. It is coupled to the primary side of the transformer and coupled to the substrate
portion by at least one or more support systems.
[0007]
In addition, a mechanical-acoustic transducer is provided that is coupled to an electromechanical
transformer, converts a signal due to mechanical vibration into an acoustic signal, and outputs
vibration and sound singly or simultaneously.
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The electromechanical transducer is a magnetic circuit portion of an electrodynamic transducer,
and one end of an excitation coil inserted in a magnetic gap of the magnetic circuit portion is
coupled to a substrate portion.
The electromechanical transducer has a magnetic circuit portion of an electrodynamic
transducer, and one end of an excitation coil inserted in a magnetic gap of the magnetic circuit
portion is coupled with a diaphragm which is a mechanical acoustic transducer.
[0008]
The electromechanical transducer has a magnetic circuit portion of an electromagnetic
transducer, and at least a part of a ferromagnetic diaphragm disposed opposite to the magnetic
circuit portion with an air gap, is coupled to the substrate portion. The electromechanical
converter has a magnetic circuit portion of an electromagnetic converter, and at least a part of a
ferromagnetic diaphragm disposed opposite to the magnetic circuit portion with an air gap
provided between the electromechanical converter and the substrate portion. Function as a
diaphragm which is a mechanical acoustic transducer. The mechanical impedance on the
secondary side is the mass of the load member coupled to a portion of the mechanical
transformer.
[0009]
An electromechanical transducer is supported at a central portion of the substrate portion. An
electromechanical transducer is supported at the periphery of the substrate portion. The
mechanical transformer is coupled to the substrate via a suspension. The shape of the suspension
is symmetrical with respect to a plane perpendicular to the vibration direction of the mechanical
transformer. One or more sets of mechanical transformers and a support system are disposed at
positions opposite to the central portion, respectively, and coupled to the electromechanical
transducer.
[0010]
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One or more sets of mechanical transformers and a support system are arranged opposite to the
central portion and coupled to the electromechanical transducer. The stiffness of the mechanical
transformer and the resonant frequency of the resonant system due to the mass of the
electromechanical transformer are made lower than the resonant frequency of the resonant
system due to the stiffness of the support system and the mass of the electromechanical
transducer. An electrical signal generator for generating a signal having a predetermined
frequency bandwidth. In the portable terminal device incorporating the electromechanical
acoustic transducer of the present invention, the housing vibrates when an electrical signal is
input. In a portable terminal device incorporating an electromechanical acoustic transducer, the
housing vibrates or generates sound or vibrates and sounds when an electrical signal is input.
[0011]
Embodiments of the present invention will be described below with reference to FIGS. 1 to 10.
[0012]
EXAMPLE 1 FIG. 1 is a perspective view of an electromechanical acoustic transducer according
to Example 1 of the present invention, and FIG. 2 is a cross-sectional view taken along the line IIII of FIG.
In FIGS. 1 and 2, a magnetic circuit is formed by the magnet 10 and the yokes 11 and 12.
Hereinafter, the magnet 10 and the yokes 11 and 12 will be referred to as a magnetic circuit
body 10A. The yoke 12 is coupled to the lever 17 at the operating point 19 of the lever 17. The
action body 17A transmits the vertical driving force of the magnetic circuit body 10A that
generates the vertical driving force to the action point 19 by the interaction with the voice coil
13 fixed to the substrate 15. The yoke 12 is further coupled to a leaf spring 18 coupled to the
support 14. The lower ends of the columns are coupled to the substrate 15. A voice coil 13 is
provided on the substrate 15 and inserted into the magnetic circuit. Each one end of the lever 17
is provided with an arc-shaped load mass 16. An arc-shaped suspension 21 is provided between
the action point 19 of the lever 17 and the support 14. The joint between the suspension 21 and
the support 14 is fixed to the substrate 15 and is an immobile point, and acts as a fulcrum.
Therefore, this portion is called a fulcrum 20. The stiffness of the lever 17 and the leaf spring 18
is lower than the resonant frequency of the resonant system due to the stiffness of the lever 17
and the mass of the magnetic circuit 10A than the resonant frequency of the resonant system
due to the stiffness of the leaf spring 18 and the mass of the magnetic circuit 10A As you are
done. The operation of the electrodynamic type electromechanical acoustic transducer
configured as described above will be described below. When an alternating current electrical
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signal is input to the voice coil 13, a driving force is generated in the voice coil 13 to vibrate the
substrate 15. Further, a reaction force of the driving force is generated to vibrate the magnetic
circuit body 10A. Assuming that the distance between the center of gravity 16A of the load mass
16 and the fulcrum 20 is L1 and the distance between the action point 19 and the fulcrum 20 is
L2, the mechanical metamorphic ratio of the load mass 16 is represented by L1 / L2. The
mechanical transformer lever 17 increases the apparent mass at the operating point 19 to a
value obtained by multiplying the value of the transformation ratio (L1 / L2) of the load mass 16
by the square. The magnetic circuit body 10A vibrates due to the reaction force of the driving
force generated in the voice coil 13. Due to this vibration, the support column 14 and the
substrate 15 vibrate at the lowest resonance frequency determined by the apparent mass, the
mass of the magnetic circuit body 10A, and the stiffness (stiffness) of the plate spring 18. Since
the apparent mass is increased relative to the mass of the substance by using the hook 17 as
described above, the vibration level proportional to the mass is increased compared to the case
where the lever 17 is not used.
[0013]
In addition, although the electro-mechanical acoustic transducer of this invention was implement
¦ achieved by the electrodynamic type in FIG. 1, as shown in FIG. 3, you may implement ¦ achieve
by an electromagnetic type. In FIG. 3, an exciting coil 22 is provided on the magnetic circuit body
10A. An iron piece 23 is provided on the surface of the substrate 15 facing the magnetic circuit
body 10A. The other configuration is the same as that of FIG. When an electric signal is input to
the exciting coil 22, a suction force is generated, the iron piece 23 vibrates, and the substrate 15
vibrates. In addition, a reaction force is also generated on the magnetic circuit body 10A side to
vibrate. The other operations are the same as in FIG. In the configuration of FIG. 1, the magnetic
circuit body 10A is supported using the plate spring 18 fixed to the support column 14, but as
shown in FIGS. And the leaf spring 26 may be used to support the magnetic circuit body 10A.
Although the suspension 21 in FIGS. 1 to 4 has a semicircular sectional shape, it may have a
substantially semicircular, elliptical, or corrugated shape.
[0014]
<< Embodiment 2 >> FIG. 6 shows a cross-sectional view of an electromechanical acoustic
transducer in Embodiment 2 of the present invention. In FIG. 6, a diaphragm 30 is provided
between the lower end of the voice coil 13 and the substrate 15 such that the outer periphery is
joined to the substrate 15 and the inner periphery is joined to the voice coil 13. The other
configuration is the same as that of the first embodiment shown in FIG. The operation of the
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electrodynamic-type electromechanical acoustic transducer configured as described above will be
described below. When a driving force is generated in the voice coil 13, the substrate 15 is
vibrated through the diaphragm 30. The difference from the first embodiment is that the
diaphragm 30 is vibrated by the driving force generated in the voice coil 13, and as a result, a
sound can be generated. Therefore, in the second embodiment, not only as a vibration source but
also simultaneously as a sound source can be used.
[0015]
Although the diaphragm 30 is fixed to the outer peripheral portion of the substrate 15 in FIG. 6,
the same effect can be obtained even if the diaphragm 31 is fixed to the central portion of the
substrate 29 as shown in FIG. Also in the electromagnetic type electromechanical acoustic
transducer shown in FIG. 3, the sound producing function can be provided as described above.
FIGS. 8a and 8b show a plan view and a cross-sectional view, respectively, of the
electromechanical acoustic transducer with sound generation function in the electromagnetic
type. In FIG. 8, the substrate 32 has four fan-shaped windows 32A, and a diaphragm 33 is
attached to the windows 32A. The other configuration is the same as that of FIG.
[0016]
The operation will be described below. When an electric signal is input to the exciting coil 22, a
suction force is generated on the diaphragm 33, and the fan-shaped diaphragm 33 generates a
sound. Further, a reaction force is also generated on the magnetic circuit body 10A side, and the
magnetic circuit body 10A vibrates. The other operations are the same as in FIG. As described
above, by adding the diaphragm 33 and changing the shape of the substrate 32, it is possible to
realize an electromechanical acoustic transducer that serves as both a vibration source and a
sound source. In the configurations shown in FIGS. 6 to 8, the magnetic circuit body 10A is
supported on the support 14 using the plate spring 18, but a new support is provided around the
magnetic circuit unit 10A and the magnetic circuit is supported using the plate spring. It does not
matter. Although the suspension 21 has a semicircular cross-sectional shape in the
configurations of FIGS. 6 to 8, it may have a semicircular, elliptical, or corrugated shape.
[0017]
EXAMPLE 3 FIG. 9 (a) is a plan view of an electromechanical acoustic transducer in Example 3 of
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the present invention, and FIG. 9 (b) is a cross-sectional view of line b-b. In FIG. 9, a plate spring
42 is provided on the support column 14 at a central angle of 120 degrees, and the magnetic
circuit body 10A is supported at three points by the plate spring 42. Furthermore, three levers
41 are provided on the support 14 via respective suspensions 21 at a central angle of 120
degrees. A load mass 16 is provided at each end of the lever 41. The leaf spring 42 is at a
position rotated 60 degrees around the post 14 with respect to the lever 41. The other
configuration is the same as that of the first embodiment shown in FIG. The operation of the
electrodynamic-type electromechanical acoustic transducer configured as described above is
substantially the same as that of the first embodiment. The unique effect of the third embodiment
is that the lever 41 and the plate spring 42 are arranged radially at intervals of 120 degrees, so
that the central axis of the magnetic circuit body 10A and the central axis of the axis 14 do not
easily shift during operation. The displacement of the circuit body 10A in the radial direction can
be prevented. Further, deformation of the substrate 15 can be suppressed. As a result, it is
possible to realize a converter in which rolling is less likely to occur. Although the
electrodynamic type is shown in FIG. 7, an electromagnetic type shown in FIG. 2 may be used.
[0018]
EXAMPLE 4 FIG. 10 shows a cross-sectional view of an electromechanical acoustic transducer in
Example 4 of the present invention. In FIG. 10, the lever 51 has the load mass 16 at one end, and
the other end is coupled to the magnetic circuit 10A. A cylindrical suspension 54 for supporting
the lever 51 is provided between the action points 52 and fulcrums 53 of the lever 51. The other
configuration is the same as that of the first embodiment shown in FIG.
[0019]
The operation of the electrodynamic-type electromechanical acoustic transducer configured as
described above is substantially the same as that of the first embodiment. The effect unique to
the fourth embodiment is that, by making the shape of the suspension 54 symmetrical with
respect to the surface of the lever 51, in FIG. 10, the radial deformation of the suspension 54
when the lever 51 vibrates up and down is prevented. be able to. Since the shape of the
suspension 54 does not change in the radial direction, the load mass 16 and the magnetic circuit
body 10A do not move in the radial direction, and it is possible to realize a transducer in which
rolling does not easily occur. Such a change in only the portion of the suspension 54 results in
little increase in weight of the entire transducer. Although in FIG. 10 the cylindrical shape is used
as the shape of the suspension 54, a substantially cylindrical shape, an elliptical cylindrical
shape, or a corrugated cylindrical shape may be used (not shown).
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[0020]
<< Fifth Embodiment >> FIG. 11 shows a block diagram of a drive device of an electromechanical
acoustic transducer according to the present invention. In FIG. 11, the output of the electrical
signal generator 56 is input to the electromechanical acoustic transducer 57 shown in the first to
fourth embodiments. When an electrical signal for operating the electromechanical acoustic
transducer 57 is input to the input terminal 55 of the electrical signal generator 56, the electrical
signal generator 56 converts the alternating current signal having a predetermined frequency
width into an electromechanical acoustic transducer. Output to 57. The electromechanical
acoustic transducer 57 converts the input signal into vibration most efficiently at a unique
resonance frequency because the resonance is sharp. If the input frequency deviates from the
resonance frequency, the conversion efficiency is adversely affected. Therefore, as shown in FIG.
12, the electric signal generator 56 is configured to output a signal in which frequencies in a
range of a predetermined frequency width F are mixed around the center frequency f. In this
way, the following effects can be obtained.
[0021]
When the electromechanical acoustic transducers of the present invention are mass-produced, it
is inevitable that the resonant frequencies of the individual electromechanical acoustic
transducers vary somewhat. If the frequency width F is set so that the variation of the resonance
frequency falls within the above-mentioned frequency width F, the resonance frequency of all the
produced electromechanical acoustic transducers is included in the input signal. Mechanical
acoustic transducers can also convert input signals into vibrations with high efficiency. The
waveform of the input signal according to another method is shown in FIG. In FIG. 13, the
frequency of the input signal is temporally changed in a range of predetermined frequencies of
the higher and lower sides of the center frequency f. As a result, the electromechanical acoustic
transducer vibrates most strongly when the frequency of the input signal matches the natural
resonant frequency of the electromechanical acoustic transducer. The frequency of vibration in
the electromechanical acoustic transducer of the present invention is a low frequency near 100
Hz. On the other hand, the frequency of the sound in the second embodiment is a high frequency
near 2500 Hz. As described above, since the two frequencies are significantly different, only the
vibration can be generated by setting the frequency of the input signal to a low frequency, and
only the sound can be generated by setting the frequency to a high frequency. As described
above, it is possible to select either vibration or sound by switching the frequency of the input
signal to either low frequency or high frequency. If both low frequency and high frequency
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signals are input simultaneously, both vibration and sound can be generated. Accordingly, stable
vibration with conversion efficiency can be realized, and an electromechanical acoustic
transducer convenient for use can be realized.
[0022]
EXAMPLE 6 FIG. 14 shows a partially broken view of a portable terminal device provided with
the electromechanical acoustic transducer of the present invention. In FIG. 14, for example, the
electromechanical acoustic transducer 62 shown in the first to fourth embodiments and the
electric signal generator 56 (not shown) shown in the fifth embodiment are provided inside a
housing 61 of a mobile phone. Hereinafter, the operation of the mobile terminal device
configured as described above will be described. When the mobile phone receives a call signal by
a circuit (not shown), an electric signal is input to the electromechanical acoustic transducer 62,
and if the frequency of the input signal is in the resonance frequency band of the
electromechanical acoustic transducer 62, it vibrates and the vibration Thus, the case 61
vibrates. With the electromechanical acoustic transducer 62 having a sound generation function,
sound can be generated simultaneously with vibration.
[0023]
The incoming call is transmitted to the user of the mobile phone by vibration and pronunciation
by the above operation. By changing the frequency of the input signal, it is possible to select the
means of transmitting only the vibration, only the sound, and both the vibration and the sound,
so the vibration and sounding functions conventionally realized by the individual parts As a
result, it is possible to make the mobile phone smaller, lighter and lower in cost. Although the
electromechanical acoustic transducer 62 is directly attached to the housing 61 in FIG. 14, the
electromechanical acoustic transducer 62 may be attached to a base (not shown) incorporated in
a mobile phone and the vibration may be transmitted to the housing via the base . Moreover,
although the portable telephone was demonstrated to the example as a portable terminal device,
it can implement similarly about another portable terminal device.
[0024]
According to the present invention, according to the present invention, the mechanical
metamorphic ratio constituted by the distance between the secondary side mechanical
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impedance and the distance between the action point portion and the action point portion
supporting point portion causes the secondary side viewed from the primary side A fulcrum
portion of at least one mechanical transformer to which mechanical impedance is transformed is
coupled to the substrate portion. Also, an electromechanical transducer is provided that is
coupled to the primary side of the mechanical transformer and coupled to the substrate portion
with at least one or more support systems to convert the electrical signal into mechanical
vibration. With this configuration, it is possible to extract high levels of vibration without
increasing the total weight of the electromechanical acoustic transducer. Furthermore, an
electromechanical acoustic transducer capable of generating sound simultaneously with vibration
can be realized by providing a mechanical acoustic transducer coupled to the electromechanical
transformer and converting the mechanical signal into an acoustic signal to output as a sound. In
addition, an electromechanical acoustic transducer in which rolling is difficult to occur in the
case where three magnetic levers are coupled to a support via respective suspensions and the
magnetic circuit is supported by leaf springs arranged radially at a central angle of 120 ° C. Can
be realized. Since the electromechanical acoustic transducer of the present invention is compact
and lightweight, miniaturization and weight reduction of a portable terminal device incorporating
the electromechanical acoustic transducer can be realized. In addition, in a mobile terminal
device incorporating an electromechanical acoustic transducer capable of generating sound
simultaneously with vibration, vibration and sound can be generated without the addition of
further components.
[0025]
Brief description of the drawings
[0026]
1 is a perspective view of an electrodynamic acoustic transducer of the dynamic type according
to the first embodiment of the present invention.
[0027]
2 II sectional view of FIG. 1
[0028]
3 is a cross-sectional view of an electromagnetic electromechanical acoustic transducer
according to the first embodiment of the present invention.
[0029]
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Fig. 4 A perspective view of one of the plate springs of the electrodynamic electro-mechanical
transducer according to the first embodiment of the present invention having a different shape.
[0030]
5 V-V cross-sectional view of FIG.
[0031]
6 is a cross-sectional view of the electrodynamic acoustic transducer of the second embodiment
of the present invention
[0032]
Fig. 7 A cross-sectional view of one having a different shape of the diaphragm of the
electrodynamic electro-mechanical transducer according to the second embodiment of the
present invention
[0033]
FIG. 8 (a) is a plan view of an electromagnetic type electromechanical acoustic transducer
according to a second embodiment of the present invention.
[0034]
Fig.9 (a) is a top view of the electromechanical acoustic transducer in Example 3 of this
invention.
[0035]
Fig. 10 A cross-sectional view of an electrodynamic acoustic transducer of the dynamic type
according to the fourth embodiment of the present invention.
[0036]
11 is a block diagram of an electrical signal generator for driving the electromechanical acoustic
transducer of the present invention
[0037]
12 shows an example of the output signal of the electric signal generator shown in FIG.
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[0038]
13 is a waveform diagram showing another example of the output signal of the electric signal
generating device shown in FIG.
[0039]
Fig. 14 A partial cutaway view of a mobile phone incorporating the electromechanical acoustic
transducer of the present invention
[0040]
Fig.15 Cross section of the conventional electromechanical acoustic transducer
[0041]
Explanation of sign
[0042]
Reference Signs List 10 magnet 11 yoke 12 yoke 13 voice coil 14 support 15 substrate 16 load
mass 17 lever 18 leaf spring 19 point of action 20 pivot point 21 suspension 23 diaphragm 32
substrate 33 diaphragm 41 lever 42 leaf spring 54 suspension
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