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DESCRIPTION JPH11313395

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DESCRIPTION JPH11313395
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electric vibration converter such as a calling apparatus which is used for a portable telephone
apparatus, a pager and the like.
[0002]
2. Description of the Related Art Conventionally, as a method of notifying an incoming call of a
calling device which is one of the electric vibration converting devices such as a portable
telephone device, a method of notifying an incoming call by hearing by driving a ringer (sound
generation There are a method of notifying an incoming call by bodily sensation by driving a low
frequency oscillating weight connected to an eccentric motor (vibration call), and a method of
visually notifying an incoming call by lighting of an LED or the like.
[0003]
In addition, with the diversification of the use needs of portable telephone devices and the like,
switching or combined use of pronunciation calling and vibration calling is frequently used.
[0004]
However, in the conventional vibration call apparatus, since the eccentric motor is used, there
existed a problem that the whole apparatus will enlarge.
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In addition, there is a problem that driving of the motor requires a large amount of power.
[0005]
In addition, since the operation of the pronunciation call and the vibration call are different from
each other, there is a problem that the whole apparatus becomes large in size even when trying
to integrate them.
[0006]
The present invention has been made in view of the above problems, and its object is not to use
an eccentric motor, and to make it possible to make a vibration call, and at the same time to
achieve a pronunciation calling means and a vibration calling means. It is an object of the present
invention to provide an electrical vibration converter which can be miniaturized.
[0007]
SUMMARY OF THE INVENTION According to the present invention, there is provided an acoustic
section having a resin film vibrating film for partitioning an acoustic air chamber, and a plate
having one end as a fixed end and the other end as a free end to which a low frequency vibration
weight is attached. A vibrating portion comprising a bar-shaped metal vibrating piece and a
piezoelectric vibrating element attached to the surface of the plate-like metal vibrating piece, and
the metal vibrating piece and the resin film vibrating film are joined via a resin adhesive It is an
electric vibration converter characterized by the above.
[0008]
In the above-described electric vibration converter, the sound generation calling operation is
based on the vibration of the piezoelectric vibration element because the resin film film of the
acoustic section and the metal diaphragm are joined via the resin adhesive. The resin film film
vibrates in a predetermined manner.
As a result, the gas inside the acoustic air chamber vibrates and resonates, and a sound of a
predetermined frequency is emitted.
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[0009]
Further, in the vibration calling operation, the piezoelectric vibrating element is attached to the
plate-like metal vibrating piece having the low frequency vibrating weight attached to the free
end.
Due to the vibration of the piezoelectric vibration element, the metal diaphragm is largely
vibrated up and down.
As a result, the entire communication device to which the electric vibration converter is attached
vibrates.
[0010]
That is, in the present invention, since both the calling means can be integrated, the
implementation occupation rate in the communication apparatus becomes small.
[0011]
Further, since the fundamental vibration source of the low frequency vibration weight portion
and the resin film vibration film is a piezoelectric vibration element, power consumption can be
extremely reduced as compared with the conventional motor drive of the vibration calling means.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an electric vibration converter of
the present invention will be described based on the drawings.
[0013]
FIG. 1 is an external perspective view of a calling device which is one of the electric vibration
conversion devices of the present invention, and FIG. 2 is a cross-sectional view thereof.
[0014]
In the figure, 1 is a box-like container, 2 is an acoustic part, 21 is a resin film vibrating film, 22 is
an acoustic air chamber, 23 is a sound communication hole, 3 is a vibrating part, 31 is a plate-
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like metal vibrating piece, 32 is piezoelectric A vibrating element, 33 is a low frequency vibrating
weight, and 4 is a resin adhesive.
[0015]
The container 1 is made of resin or the like and divided into upper and lower parts.
The sound unit is mainly disposed on the upper case 1 a side, and the vibration unit 3 is mainly
disposed on the lower case 1 b side.
[0016]
One side surface of the casing 1 is open, and a plate-like metal vibrating piece 31 and a low
frequency vibrating weight 33 of the vibrating portion 3 extend from the side surface opening.
[0017]
In addition, a sound communication hole 23 for communicating the gas of the acoustic unit 2
and the external gas is formed on the upper surface of the casing 1.
[0018]
The acoustic part 2 is mainly formed on the upper case 1a side, and the acoustic air chamber 22
of the upper case 1a has a step 24 provided on the inner side upper surface and the inner side
surface of the upper case 1a, and a resin film vibration It is formed surrounded by the membrane
21.
The resin film vibration film 21 and the step portion 24 are attached by a resin adhesive (not
shown) or the like.
[0019]
The resin film vibration film 21 is made of, for example, a polyetherimide resin film, a PET resin
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film, or the like, and the thickness thereof is 6 to 8 μm.
The planar shape is a shape corresponding to the shape of the stepped portion 24
circumferentially provided on the inner side surface of the upper case 1a, for example, a circular
shape, and in the thickness direction, the central portion protrudes to the lower case 1b side. It
has a plate shape.
[0020]
The vibration source of the resin film vibration film 21 is the metal vibration reed 31 of the
vibration unit 3, that is, the piezoelectric vibration element 32 attached to the metal vibration
reed 31.
[0021]
The vibrating portion 3 is disposed on the lower case 1 b side, and includes a plate-like metal
vibrating piece 31, a piezoelectric vibrating element 32, and a low frequency vibrating weight 33.
[0022]
The plate-like metal vibrating piece 31 is made of phosphor bronze, 42 alloy, Kovar, or other
predetermined elastic metal members, and has a length of 18.0 to 22.0 mm, for example, a
maximum width of 3.0 mm, and a minimum width 2 of the constricted portion. It is a metal plate
piece having a thickness of about 0. 0 mm and a thickness of about 0.3 mm.
[0023]
One end side of the plate-like metal vibrating piece 31 is a fixed end, and as shown in FIG. 3, a
fixing hole 34 fixed by a bolt or the like is formed, and fixed to the fixed pedestal 11 of the lower
case 1b by a bolt or the like. ing.
[0024]
Further, the other end side of the plate-like metal vibrating reed 31 is a free end, and the low
frequency vibrating weight 33 is integrally attached to the tip end thereof.
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The low frequency vibration weight 33 is made of, for example, tungsten metal, and the shape
thereof is a rectangular solid of 3 mm × 3 mm × 4 mm.
The low frequency oscillating weight 33 has a weight of, for example, 0.9 to 1.6 g.
[0025]
The piezoelectric vibrating element 32 and the vibration frequency detecting element 35 are
attached to one main surface, for example, the lower surface side of the metal vibrating piece 31.
[0026]
The piezoelectric vibration element 32 and the vibration frequency detection element 35 are
composed of a piezoelectric ceramic substrate subjected to polarization processing such as PZT
(lead zirconate titanate) and electrodes on both main surfaces.
[0027]
The piezoelectric vibration element 32 described above is a vibration source that applies
vibration corresponding to the drive voltage to the plate-shaped metal vibrating piece 31 and
causes the plate-shaped metal vibrating piece 31 to vibrate in the vertical direction at a
predetermined frequency.
At the same time, it also serves as a vibration source that applies a predetermined vibration to
the resin film vibration film 21.
[0028]
The vibration frequency detection element 35 converts the vibration of the metal vibrating reed
31 into a voltage, and is an element for extracting a feedback signal of the vibration unit 3.
[0029]
In the above description, it is described that the electrodes are formed on both main surfaces of
the piezoelectric ceramic substrate, but the electrodes on the surface to be attached to the metal
vibrating reed 21 are omitted, and the conductive adhesive is used. The piezoelectric vibrating
element 32 and the vibration frequency detecting element 35 may be attached to the metal
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vibrating reed 21.
[0030]
The resin adhesive 4 adheres the plate-like metal vibrating reed 31 of the vibrating portion 3 and
the resin film vibrating membrane 21 of the acoustic portion 2, and transmits the vibration of the
metal vibrating reed 31 to the resin film vibrating membrane 21.
[0031]
In the lower case 1b, a circuit for forming a drive voltage to be applied to the piezoelectric
vibrating element 32 and various electronic components constituting a circuit for controlling the
above-described drive voltage based on a feedback signal from the vibration frequency detection
element 35, An IC element 5 is disposed.
[0032]
Specifically, as shown in FIG. 4, the vibrator element R comprising the piezoelectric vibration
element 32 and the element 35 for detecting the vibration frequency, the logic circuit L1, the
control logic circuit L2, and the amplifier A are mainly constituted.
Then, the sound generation signal is input to the IN terminal of the control logic circuit L2.
[0033]
First, the output of the amplifier A is supplied as the drive voltage signal d to the piezoelectric
vibrating element 32 of the vibrator element R via the logic circuit L1, and the piezoelectric
vibrating element 32 vibrates with a predetermined vibration.
[0034]
The vibration of the metal vibrating reed 31 is fed back from the vibration frequency detecting
element 35 of the vibrator element R as a feedback signal f to the control logic circuit L2.
[0035]
The control logic circuit L2 controls the frequency of the drive voltage signal d output from the
logic circuit L1 in accordance with the feedback signal f.
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[0036]
The case where it is used as a vibration calling means in the calling device configured as
described above will be described.
[0037]
In this case, the first drive voltage signal d is supplied to the piezoelectric vibrating element 32 of
the metal vibrating piece 31.
The first drive voltage signal d is controlled by the logic circuit L1.
From this, it vibrates at a predetermined low frequency of the metal vibrating reed 31 (including
the low frequency vibrating weight).
The low frequency is about 50 to 200 Hz, and the natural frequency of the metal vibrating reed
31 (including the low frequency vibrating weight) is, for example, 70 Hz.
[0038]
Then, the feedback signal f is measured, and the drive voltage signal d is controlled by the logic
circuit L1 and the control logic circuit L2 so that the frequency of the amplitude of the metal
vibrating reed 31 becomes 70 Hz.
As a result, the vibration is stable and strong at 70 Hz, which is the natural frequency of the
metal vibrating reed 31.
[0039]
In addition, in the case of using as the sound generation vibration means, the second drive
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voltage signal d is supplied to the piezoelectric vibration element 32 of the metal vibration piece
31.
The second drive voltage signal d is a signal that causes the metal vibrating reed 31 to vibrate at
70 Hz, for example, which matches the natural frequency of the metal vibrating reed 31 when
used in the above-described vibration calling means. The second drive vibration d is, for example,
a signal in which the metal vibrating reed 31 vibrates at 2500 Hz.
[0040]
From this, at 2500 Hz that exceeds the basic natural frequency (for example, 70 Hz) of the metal
vibrating reed 31, the low frequency vibrating weight 33 does not largely oscillate at the free end
of the metal vibrating reed 31.
Then, the metal vibrating reed 31 vibrates at 2500 Hz, and the vibration is propagated to the
resin film vibrating film 21 of the acoustic unit 2 through the resin adhesive 4.
Then, according to the vibration of the resin film vibrating film 21, the air in the acoustic air
chamber 22 vibrates and resonates, and a ringing tone is emitted to the outside through the
sound communication hole 23.
[0041]
Here, in the present invention, the low frequency vibrating weight 33 and the resin film vibrating
film 21 of the acoustic unit 2 are vibrated by the metal vibrating reed 31.
[0042]
This means that the natural frequency of the metal vibrating reed 31 has some natural
frequencies other than 70 Hz, and the natural frequency other than 70 Hz is used.
[0043]
When the present inventors measure the natural frequency using the above-mentioned metal
vibrating reed 31, for example, 70.586 Hz, 341.03 Hz, 356.03 Hz, 634.53 Hz, 1968.2 Hz,
2511.8 Hz, 4305. It was found to have 12 natural frequencies: 1 Hz, 5390.2 Hz, 7187.1 Hz,
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10268 Hz, 14645 Hz, 14797 Hz.
[0044]
That is, when a signal of 70.586 Hz is given to the first drive voltage signal, the metal vibrating
reed 31 stably oscillates at this frequency.
[0045]
Also, when the second drive voltage signal is given a signal of 2500 Hz which approximates the
sixth natural frequency, the low frequency oscillating weight 33 at the free end actually becomes
the fixed end in operation, and the metal vibrating reed 31 Vibrates as the belly of the vibration.
Therefore, the ringing tone is emitted from the sound unit 2 to the outside very efficiently.
[0046]
From the above, it is important for the material of the resin adhesive 4 that the resin adhesive 4
does not peel off or mechanical damage does not occur even if the metal vibrating reed 31
vibrates with low frequency vibration, for example, An adhesive such as epoxy resin can be used.
[0047]
The adhesive portion between the metal vibrating reed 31 of the vibrating portion and the resin
film vibrating film 21 of the acoustic portion 2 by the resin adhesive 4 is, for example, 2500 Hz
(approximate to the sixth natural frequency). Bonding to a position centered on the antinode
portion of the vibration in the vibration mode when the harmonic component of the natural
frequency of vibration has a high efficiency of propagation of the vibration from the metal
vibrating reed 31 to the resin film vibrating film 21 Important for
[0048]
Furthermore, the natural frequency of the metal vibrating reed 31 is covered with the first
natural frequency (70.586 Hz) to the seventh natural frequency (4305.1 Hz) in the range of 300
to 3400 Hz which is generally referred to as an audible frequency. It is done.
[0049]
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That is, other than the sound generation means indicating an incoming call using the metal
vibrating reed 31, if the drive voltage signal signal d for reproducing the audio signal is formed
by the logic circuit L1 and the control logic circuit L2, it is also used as a receiver It will be
possible.
[0050]
In addition, the sound pressure level must be constant at 300 to 3400 Hz. Therefore, frequency
signals other than the above-mentioned natural frequency are amplified by an amplification
circuit, and an acoustic resistance cloth is attached to the acoustic air chamber 22. The sound
adjustment holes are formed to flatten the sound pressure level.
Thereby, in addition to the vibration calling means indicating an incoming call and the sound
generation calling means, it can further be used as a voice generation means.
[0051]
For example, in the portable telephone apparatus, it is possible to select the vibration calling
means and the sounding calling means at the time of arrival by the signal inputted to the IN
terminal of the control logic circuit L2.
Further, after the incoming call or at the time of transmission, it can be used as a sound
generation means for reproducing an audio signal by a signal inputted to the IN terminal of the
control logic circuit L2.
[0052]
As described above, in the electric vibration converter which is the calling device according to the
present invention, the vibration unit that indicates an incoming call by low frequency vibration
and the acoustic unit that indicates an incoming call by sound are integrated. Can reduce the
number of parts in the system and can contribute significantly to downsizing.
[0053]
Further, the respective vibration sources of the vibration unit 3 and the sound unit 2 are shared,
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and the piezoelectric vibration element 32 is used, so that lower power consumption can be
achieved as compared with the conventional eccentric motor.
[0054]
In the above embodiment, the acoustic air chamber 22 emits sound to the outside through the
sound communication hole 23 based on the vibration of the metal vibrating reed 31, but
conversely, like the microphone, the sound is emitted from the outside. The gas of the acoustic
air chamber 22 is vibrated through the communication hole 23, and the vibration is detected by
the vibration frequency detection element 35 attached to the metal vibrating piece 31 through
the resin film vibrating film 21. It does not matter.
[0055]
In the above-described embodiment, the piezoelectric vibrating element 32 attached to the metal
vibrating piece 31 is a unimorph type attached only to the lower main surface of the metal
vibrating piece 31, but may be attached to the upper surface side The bimorph type may be
attached to the upper and lower main surfaces.
[0056]
As described above, according to the present invention, since the vibrating portion and the
acoustic portion are integrated, the number of parts in the mounting apparatus can be reduced,
and downsizing can be achieved.
[0057]
In addition, since the vibration source of the vibration unit and the sound unit is configured by
the piezoelectric vibration element and is shared, low power consumption can be achieved.
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