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JPH11146491

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH11146491
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electromechanical conversion component incorporated in a portable device such as a pager
(pager) and a portable telephone and used as a calling means.
[0002]
2. Description of the Related Art Conventionally, as a calling means for indicating the arrival of a
portable device such as a pager or a portable telephone, the one by the sound of a piezoelectric
speaker etc. Are known to generate vibration by rotating the DC motor (referred to as a vibrator
function). In a portable device having both a sounder function and a vibrator function, both a
piezoelectric speaker and a DC motor are mounted in the device, and a call indicating an
incoming call is made by any function preset by the user .
[0003]
However, in a portable device having both a sounder function and a vibrator function, it is
necessary to mount both a piezoelectric speaker and a DC motor. Compared to other electronic
components, the occupied area is large, which is one of the factors that hinder the
miniaturization and weight reduction of portable devices.
[0004]
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1
An object of the present invention is to provide an electro-mechanical transducer component
which is reduced in size and weight in view of the above-mentioned circumstances.
[0005]
In order to achieve the above object, an electromechanical transducer according to the present
invention for achieving the above object comprises (2) a beam-shaped vibrator (3) having at least
one end fixed to its base (3) electricity for vibrating the vibrator An acoustic transducer is
provided.
[0006]
In the present invention, with the above configuration, the vibrator resonates in the low-order
mode when a low frequency is applied to the electroacoustic transducer, so that a vibrator
function is realized.
In addition, when a high frequency is applied to the electroacoustic transducer, the vibrator
resonates in a high-order mode, so that a sounder function is realized.
Since these electroacoustic transducers and vibrators are smaller and lighter than those equipped
with both the conventional piezoelectric speaker for the sounder function and the DC motor for
the vibrator, the size and weight of the portable device can be reduced. It is possible.
[0007]
Here, the electroacoustic transducer may be any one of the piezoelectric element, the
electrostrictive element, and the magnetostrictive element.
The piezoelectric element is distorted or stressed when a voltage is applied, and thus the
vibrating body can be vibrated by applying an alternating voltage to the piezoelectric element.
The vibrator can also be vibrated by applying a change in electric field to the electrostrictive
element. Furthermore, since the magnetostrictive element expands and contracts by applying a
magnetic field, the oscillator can be vibrated by applying a change in magnetization to the
magnetostrictive element.
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2
[0008]
Preferably, the vibrator is a cantilever-shaped vibrator, and a weight is fixed to the tip of the
cantilever shape. As described above, if a weight is fixed to the tip of the vibrating body, the
resonance frequency can be lowered even if it is small. Furthermore, it is preferable that the
electroacoustic transducer be fixed to the vibrator.
[0009]
When the electroacoustic transducer is fixed to the vibrator, distortion or stress of the
electroacoustic transducer can be directly transmitted to the vibrator, and the vibrator function
and the sounder function can be enhanced. The electroacoustic transducer may be disposed in
contact with both the base and the vibrator.
[0010]
When the electroacoustic transducer is placed in contact with both the substrate and the
vibrator, strain or stress of the electroacoustic transducer can be transmitted to the vibrator with
a reaction force on the substrate, and again the vibrator function and the sounder function Can
be enhanced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below.
FIG. 1 is a perspective view of an electromechanical transducer according to a first embodiment
of the present invention. The electromechanical transducer part 10 shown in FIG. 1 is provided
with an L-shaped base 11 having a cutout 11a. Further, a vibrating body 13 made of a cantilevershaped metal plate fixed at one end to the cut portion 11 a of the base 11 and fixed by a screw
12 is provided. A weight 14 is fixed to the tip of the vibrating body 13. Further, a piezoelectric
body 15 (electroacoustic transducer according to the present invention) subjected to polarization
processing is fixed to the side of the cut portion 11a of the base body 11a of the vibrator 13 by a
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conductive adhesive or the like.
[0012]
In the electromechanical transducer 10 configured as described above, an alternating voltage is
applied to the upper surface of the piezoelectric body 15 and the lower surface of the vibrating
body 13 as shown in FIG. Then, distortion or stress occurs in the piezoelectric body 15, and
resonance occurs at one of the resonance frequencies of the vibration system determined by the
configuration of the electromechanical conversion component 10. In the resonance mode with
the lowest (first) resonance frequency, the weight 14 fixed to the tip of the vibrating body 13
vibrates with the maximum amplitude, and this vibration is transmitted to the substrate 11 to
realize a vibrator function. On the other hand, in a resonance mode with a high-order resonance
frequency, the weight 14 is substantially fixed, and a resonance having a plurality of nodes and
an antinode occurs in the vibrating body 13. In such a vibration mode, since resonance in the
audio frequency range can be obtained, a sounder function by sound is realized.
[0013]
The electromechanical conversion component 10 having only the base 11, the vibrator 13, the
weight 14 and the piezoelectric member 15 has a simple structure and is small and lightweight.
Therefore, the electromechanical conversion component 10 can be used as a portable device. As
a result, the size and weight of the portable device can be reduced. The magnitude and strength
of the vibration are the AC voltage to be applied, the attachment position of the piezoelectric
body 15 and the thickness of the piezoelectric body 15, the piezoelectric constant, the shape
(width, thickness, length) and Young's modulus of the vibrator 13, and It can be easily changed
by the weight of the weight 14 attached to the tip of the vibrating body 13, the attachment
position of the weight 14, and the like. In addition, in the case where piezoelectric members
whose polarization directions are opposite to each other are attached to both the front and back
of the vibrator 13, a larger amplitude can be obtained.
[0014]
FIG. 2: is a perspective view of the electric equipment conversion component of 2nd Embodiment
of this invention. Compared with the electromechanical transducer component 10 shown in FIG.
1 described above, the electromechanical transducer component 20 shown in FIG. It differs in
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that an acoustic transducer is arranged. As described above, the piezoelectric actuator 25 may be
disposed, an alternating voltage may be applied to the piezoelectric actuator 25, and the vibrator
13 may be vibrated by distortion generated by the piezoelectric effect of the piezoelectric
actuator 25.
[0015]
In the present embodiment, the cantilever-shaped vibrator is described, but a double-pillarshaped vibrator may be used, and the vibrator is vibrated using a piezoelectric element as an
electroacoustic transducer. However, an electrostrictive element is used. Alternatively, the
vibrator may be vibrated using a magnetostrictive element. Also, instead of the vibrator whose
weight is fixed to the tip of the cantilever shape, the vibrator having only the cantilever shape
may be vibrated by the above-described electroacoustic transducer.
[0016]
EXAMPLES Examples of the present invention will be described below. As an example of the
present invention, an electrical device conversion component 10 shown in FIG. 1 was
manufactured. First, prepare a stainless steel plate with a thickness of 0.15 mm, a width of 4 mm,
and a length of 15 mm, and a brass weight with a weight of 3 g with a slit that can be fitted to
the stainless steel plate. I attached a weight. Next, a thick film Ag paste is baked on the upper and
lower surfaces, and a 0.12 mm thick PZT ceramic plate with a length of 3 mm and a width of 3
mm is polarized in the thickness direction, and the opposite end with a stainless steel plate It
adhered with a conductive epoxy adhesive at a position of 2 mm. Furthermore, lead wires were
soldered to the surface of the ceramic plate, and other lead wires were fixed to the stainless steel
plate with a conductive epoxy adhesive. Next, the edge on the ceramic plate side of the stainless
steel plate was inserted into the cut portion formed in the base (base) and fixed from the top with
a screw.
[0017]
When an alternating voltage with an amplitude of 40 V is applied to the two lead wires, the first
resonance mode in which the weight vibrates at the maximum amplitude is obtained when the
frequency of the alternating voltage is about 50 Hz, and the base portion vibrates. did. When the
frequency of the AC voltage was raised, resonance noise of the frequency was obtained from the
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portion of the stainless steel plate at about 1.3 kHz and 1.6 kHz. Thus, an electromechanical
transducer 10 was obtained which operates as a vibrator at a frequency of 50 Hz and operates as
a buzzer at frequencies of 1.3 kHz and 1.6 kHz. Therefore, miniaturization and weight reduction
can be achieved as compared with the conventional configuration of a DC motor and a
piezoelectric speaker.
[0018]
Although only the above configuration is described in the present embodiment, in addition to
this, improvement is made such as raising the sound pressure by adding a diaphragm for
resonating the sound due to the vibration in the high-order mode. be able to.
[0019]
As described above, according to the present invention, a compact and lightweight
electromechanical transducer can be obtained.
Therefore, by incorporating the electromechanical transducer according to the present invention
into a portable device, the size and weight of the portable device can be reduced.
[0020]
Brief description of the drawings
[0021]
1 is a perspective view of the electromechanical transducer of the first embodiment of the
present invention.
[0022]
2 is a perspective view of the electromechanical transducer of the second embodiment of the
present invention.
[0023]
Explanation of sign
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[0024]
DESCRIPTION OF SYMBOLS 10 and 20 Electromechanical conversion parts 11 and 21 Base 11a
Cut part 12 Screw 13 Vibrator 14 Weight 15 Piezoelectric 25 Piezoelectric actuator
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