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JP2011004210

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DESCRIPTION JP2011004210
An object of the present invention is to provide a more reliable speaker device which is smaller in
size and suppresses heat generation by using a magnetostrictive element, suppresses generation
of an echo and the like when a microphone is mounted. A magnetostrictive element (30), a coil
(31) for driving the magnetostrictive element (30), a control means (C1) for controlling
energization of the coil 31, transmission members (20-24) for transmitting displacement of the
magnetostrictive element (30) The speaker device 1 includes the TS, and the temperature
detection means TS is provided in the vicinity of the magnetostrictive element 30, and the control
means C1 has a predetermined temperature detected based on the signal from the temperature
detection means C1. When the temperature is equal to or higher than the temperature, the
energization of the coil 31 is stopped or the amount of energization is reduced. [Selected figure]
Figure 4
Speaker device
[0001]
The present invention relates to a speaker device using a magnetostrictive element.
[0002]
In recent years, various speaker devices using magnetostrictive elements have been developed.
A speaker device using a magnetostrictive element can be configured to be extremely small as
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compared with a conventional cone-type speaker. For example, in the prior art described in
Patent Document 1, a part of the legs supporting the video display apparatus on the floor is
replaced with a speaker apparatus using a magnetostrictive element, and the installation place is
not affected. A speaker device with good acoustic characteristics is disclosed. Further, in the prior
art described in Patent Document 2, a microphone is provided in the hole provided on the table
surface, and the waveform of the reverse phase of the background noise picked up by the
microphone is the speaker device using the magnetostrictive element. An audio system is
disclosed which is generated by vibrating a table surface to reduce background noise around the
table. In addition, since the speaker device using the magnetostrictive element can be
miniaturized, it is very convenient if it is equipped with a microphone and it can be applied to
hands-free calling, teleconference and the like. For example, in the prior art described in Patent
Document 3, a speaker is disposed below the hemispherical reflector (acoustic reflector) which is
convex downward, and directed to the direction of the reflector, and a microphone is provided
above the reflector. There is disclosed a hands-free communication device having a configuration
in which a reflector is disposed between a speaker and a microphone.
[0003]
JP, 2007-158752, A JP, 2006-526921, A JP, 2000-253134, A
[0004]
In the prior art described in Patent Document 1, replacing a part of the support for supporting
the image display apparatus on the floor with a speaker apparatus using a magnetostrictive
element does not particularly require an installation place like a conventional speaker apparatus
However, due to its small size and large output, the speaker device generates a relatively large
amount of heat.
If the operation is continued in a high temperature state, the reliability of the speaker device may
be reduced. Further, the audio system described in Patent Document 2 is a noise canceler that
outputs a waveform in reverse phase from the speaker so as to reduce the sound picked up by
the microphone, and thus is suitable for use as a hands free device or a telephone conference
device. Not. In addition, when a magnetostrictive element is used in the hands-free
communication device described in Patent Document 3 and the speaker and the microphone are
provided in the device to be miniaturized, the speaker device using the magnetostrictive element
is also provided by surrounding the microphone with a reflector. The vibration of the speaker
device itself is larger than that of the conventional speaker device that vibrates the cone paper,
and the vibration of the microphone becomes large, so there is a concern about the occurrence of
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an echo or the like. The present invention has been made in view of such a point, and by using
the magnetostrictive element, the size is smaller and the heat generation is suppressed, and when
the microphone is mounted, the generation of the echo etc. is suppressed and the more An object
is to provide a highly reliable speaker device.
[0005]
As means for solving the above-mentioned problems, a first aspect of the present invention is a
speaker apparatus as described in claim 1. The speaker device according to claim 1 comprises: a
magnetostrictive element; a coil for driving the magnetostrictive element; control means for
controlling energization of the coil; a transmission member for transmitting a displacement of the
magnetostrictive element; And a speaker device provided with The temperature detection means
is provided in the vicinity of the magnetostrictive element, and the control means is configured to
energize the coil when the temperature detected based on the signal from the temperature
detection means is equal to or higher than a predetermined temperature. Stop or reduce the
amount of power.
[0006]
A second aspect of the present invention is a speaker apparatus as recited in claim 2. The
speaker device according to claim 2 is the speaker device according to claim 1, wherein the
magnetostrictive element, the coil, and the transmission member are accommodated in a case
member, and the transmission member is at a lower end of the case member. An open hole
communicating with the inside and the outside of the case member is provided in any part of the
case member, and a microphone is provided inside the case member in the open hole, A thin
plate-like elastic body whose central portion is opened is sandwiched between the opening and
the microphone.
[0007]
According to the speaker device of the first aspect, when it is detected that the temperature of
the magnetostrictive element has reached the predetermined temperature or more, heat
generation can be suppressed by stopping energization of the coil or reducing the amount of
energization. Thus, a more reliable speaker device can be realized.
[0008]
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Further, according to the speaker device of the second aspect, the thin plate-like elastic body
whose central portion is opened is sandwiched between the opening hole of the case member
and the microphone, so that the space between the opening hole and the microphone is sealed.
Then, the microphone is configured not to pick up the sound inside the case member, and the
elastic body is also used as an insulator to reduce the vibration of the case member transmitted
to the microphone.
As a result, the occurrence of an echo or the like can be suppressed, and a more reliable speaker
device can be realized.
[0009]
It is a perspective view explaining the external appearance of one embodiment of the speaker
apparatus 1 of the present invention. FIG. 2 is a cross-sectional view for explaining an example of
the internal structure of the speaker device 1; It is an assembly drawing (a part of members is
described in sectional drawing) explaining the example of the structure of the speaker apparatus
1. FIG. FIG. 1 is a schematic block diagram of a speaker device 1;
[0010]
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings. FIG. 1 shows a perspective view from above and a perspective view from below in an
embodiment of the speaker device 1 of the present invention. The speaker device 1 can be used
for various applications, and can be used, for example, as a hands-free device of a mobile phone,
a telephone conference device, a speaker for a music reproduction device, or the like. In addition,
when using for the speaker etc. for music reproduction apparatuses, a microphone can be
abbreviate | omitted. Hereinafter, in the description of the present embodiment, an example in
which the speaker device 1 is used as a hands-free device is shown, and an example of the
speaker device 1 on which the microphone M is mounted will be described.
[0011]
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[External Appearance of Speaker Device 1 (FIG. 1)] An example of the external appearance of the
speaker device 1 will be described with reference to FIG. The speaker device 1 described in the
present embodiment has a columnar shape with a height of about 8 cm, and is very small. The
shape is not limited to a cylindrical shape. In the speaker device 1, the outer shape is configured
by the upper case member 11 and the lower case member 12, and the power button B 1, the
volume (+) button B 2, the volume (−) button B 3, and the microphone mute are provided on the
upper surface of the upper case member 11. The button B4 and the like are disposed, and the
cover 13 is attached. In the speaker device 1 shown in the example of FIG. 1, the upper case
member 11, the lower case member 12, and the cover 13 constitute a case member which is an
outer shape of the speaker device 1. Further, the opening hole H1 is a hole for voice input, and a
microphone is attached to the back side of the opening hole H1.
[0012]
A transmission ring 21 for transmitting displacement (expansion and contraction) of the
magnetostrictive element is attached to the lower surface of the lower case member 12 by a
screw 23, and a sheet member 22 is attached to the lower surface of the transmission ring 21. .
The speaker device 1 is placed on a flat surface such as a table surface or a floor surface so that
the sheet member 22 at the bottom is in contact, and displacement (expansion and contraction)
of the magnetostrictive element is transmitted from the transfer ring 21 through the sheet
member 22 to the table surface or The sound is transmitted to a floor or the like, and the placed
table or floor is vibrated to obtain an acoustic effect (the table or floor or the like is used as a
speaker (oscillator)).
[0013]
[Entire Configuration of Speaker Device 1 (FIGS. 2 to 4)] The speaker device 1 described in the
present embodiment includes communication means C2 such as Bluetooth (registered trademark)
as shown in the schematic block diagram of FIG. , And can communicate with the external device
EX of the communication partner. Next, the overall structure of the speaker device 1 will be
described using the schematic block diagram shown in FIG. 4, the cross-sectional view shown in
FIG. 2, and the assembly diagram shown in FIG. 3 (some members are described in the crosssectional view). In the schematic block diagram shown in FIG. 4, various interface circuits and the
like are omitted. As shown in the schematic block diagram of FIG. 4, the speaker device 1
includes a communication unit C2, an antenna AT, a control unit C1, a microphone M, an
amplification unit C3, a coil 31, a magnetostrictive element 30, a temperature detection unit TS,
and a disc magnet 24. A transmission rod 20, a transmission ring 21, and a seat member 22 are
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provided. In the speaker device 1 described in the present embodiment, the transmission means
is constituted by the transmission rod 20 provided with the disc magnet 24, the transmission
ring 21 and the sheet member 22, but the construction of the transmission means is as follows: It
is not limited to this configuration.
[0014]
[Assembled state of each member (FIGS. 2 and 3)] Further, as shown in FIGS. 2 and 3, in the
speaker device 1, the case including the upper case member 11, the lower case member 12, and
the cover 13 Each member accommodated in the inside is supported by the upper holder 14 and
the lower holder 15, and the upper holder 14 and the lower bolt 15 are fixed by the long screw
NN. An elastic member 25 (a spring or the like) is disposed at a central bottom portion of the
lower holder 15, and the transmission rod 20 is inserted so as to penetrate the lower holder 15
and the elastic member 25. A disc magnet 24 is attached to the upper end of the transmission
rod 20, and a magnetostrictive element 30, a coil 31, and a ring magnet 32 are assembled on the
disc magnet 24, and a yoke 33 is assembled thereon. There is. Then, the upper holder 14 is
assembled from above the yoke 33 so as to be fitted to the lower holder 15, and fixed by long
screws NN. Further, as shown in FIG. 3, the battery BT is held between the lower holder 15 and
the upper holder 14, and a terminal TD is attached to the electrode position of the battery BT.
[0015]
The central portion of the upper holder 14 is opened so as to expose the yoke 33, the subsubstrate KS provided with the temperature detection means TS is mounted on the yoke 33, and
the control substrate KM is mounted thereon. Further, as shown in FIG. 3, a small chip-type LED
(not shown) is disposed on the control substrate KM, and a rod 13A of a transparent acrylic
member is placed on the LED. The rod 13A is configured such that the light of the LED is guided
inside, and the entire rod 13A of the acrylic member emits light, thereby improving the visibility
from the user. Then, the operation state of the speaker device 1 is displayed by the light emission
state (color, blinking state, etc.) of the LED (rod 13A). Further, 13 B is a switch connected to the
volume buttons B 2, B 3, etc., and the description will be omitted. Thus, the upper holder 14 and
the lower holder 15 with the respective members assembled are accommodated in the lower case
member 12, and the upper case member 11 and the cover 13 are attached. Then, the
transmission ring 21 to which the sheet member 22 is attached is attached from the back side of
the lower case member 12 with the screw 23.
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[0016]
[Operation and Function of Each Member in Schematic Block Diagram (FIG. 4)] The
communication means C2 is, for example, a Bluetooth (registered trademark) circuit, and is
mounted on the control substrate KM shown in FIGS. 2 and 3. The antenna AT is also attached to
the control substrate KM. The communication unit C2 receives an audio output signal from the
external device EX via the antenna AT, and outputs the received audio output signal to the
control unit C1. Further, the communication means C2 receives an audio input signal input from
the microphone M via the control means C1, and transmits the input audio input signal to the
external device EX via the antenna AT. The communication means C2 may not be wireless
communication, and may be communication means for performing transmission and reception
with the external device EX via a cable such as a LAN.
[0017]
The control means C1 is, for example, a CPU (central processing unit) and its peripheral circuits,
etc., and is mounted on the control substrate KM shown in FIGS. 2 and 3. The control unit C1
converts an audio output signal (for example, digital information) input from the communication
unit C2 into an analog signal according to a program stored in advance, and outputs the
converted audio output signal to the amplification unit C3. Further, the control means C1
converts an audio input signal (for example, an analog signal) input from the microphone M into
a digital signal, and outputs the converted audio input signal to the communication means C2.
Further, the control means C1 can detect the temperature of the magnetostrictive element 30
(the temperature around the magnetostrictive element 30) based on the signal from the
temperature detection means TS.
[0018]
When it is detected that the temperature of the magnetostrictive element 30 is equal to or higher
than the predetermined temperature, the control means C1 stops or attenuates the output of the
audio output signal to the amplification means C3, or instructs the stop of the output to the coil
31 or A signal instructing attenuation of the output to the coil 31 is output to the amplification
means C3. The speaker device 1 using the magnetostrictive element can be further miniaturized
as compared with the conventional cone-type speaker device, but heat may be absorbed by the
miniaturization, and the temperature may be higher than a predetermined temperature (for
example, about 70 °). However, if the temperature exceeds a predetermined temperature, the
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coil 31 can be deenergized or the amount of energization can be reduced, and the temperature of
the magnetostrictive element 30 can be appropriately lowered. Then, when the detected
temperature becomes equal to or less than the return temperature (for example, about 60 ° C.
or less), the control means C1 cancels the stop or reduction of the energization to the coil 31, and
returns to the normal energization. The speaker device 1 described in the present embodiment
dissipates heat from the lower holder 15 and the upper holder 14 without using the heat
dissipating fins that accommodate the magnetostrictive element 30, the coil 31, and the ring
magnet 32 in order to further reduce the size. The structure may be provided with a radiation fin.
[0019]
The temperature detection means TS is, for example, a thermistor, and is attached to the sub
substrate KS shown in FIGS. 2 and 3. Although the magnetostrictive element 30 and the coil 31
wound around the bobbin are heat sources, providing the temperature detecting means TS
directly to the magnetostrictive element 30 or the coil 31 as shown in FIGS. 2 and 3 is a space.
Forming a recess in the yoke 33 (the yoke 33 is made of metal and has high thermal
conductivity) in contact with the top of the magnetostrictive element 30 and the coil 31, and the
temperature detection means TS is disposed in this recess doing. The gap between the recess of
the yoke 33 and the temperature detection means TS is filled with a filler (such as an adhesive)
having thermal conductivity. Thereby, the temperature of the magnetostrictive element 30 can be
appropriately detected by the temperature detection means TS.
[0020]
The amplification means C3 is mounted on the control substrate KM shown in FIG. 2 and FIG. As
described above, the amplifying unit C3 amplifies the audio output signal input from the control
unit C1, and outputs the amplified audio output signal (analog signal) to the coil 31. The
amplification means C3 includes an interface circuit for the input and a control circuit for
executing the stop or attenuation when an instruction to stop or attenuate the energization of the
coil 31 is input from the control means C1 (see FIG. When stopping or attenuating on the side of
the control means C1, a circuit for stopping or attenuating or the like is unnecessary on the side
of the amplification means C3).
[0021]
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The coil 31 is accommodated in a cylindrical ring magnet 32 as shown in FIGS. 2 and 3 and
further accommodates a cylindrical magnetostrictive element 30. When the coil 31 is energized,
the magnetostrictive element 30 is displaced (stretched (vibrated) in the longitudinal direction)
according to the amount of energization. The magnetostrictive element 30 vibrates the
transmission rod 20 and the transmission ring 21 via the disk magnet 24, and the vibration is
transmitted to the table surface F (on which the speaker device 1 is mounted) via the sheet
member 22. A sound is generated from the table surface F. The disk magnet 24 is a disk having
magnetism, and it was confirmed by an experiment that there is an effect of improving distortion
in a specific frequency band (for example, around 2 kHz). Further, the sheet member 22 is, for
example, a silicon rubber sheet having a thickness of about 0.5 mm, and absorbs unevenness on
a floor surface or the like to improve adhesion and prevents the main body from jumping up due
to vibration. Although the speaker device 1 described in the present embodiment is very small
and has a small mass of about 8 cm in height, the vibration energy that can be transmitted to the
mounted table surface etc. is very high. The volume may jump up depending on the volume.
However, the sheet member 22 can appropriately prevent the bounce.
[0022]
As shown in FIGS. 2 and 3, the microphone M is attached to the inside of an opening hole H1
communicating the inside and the outside of the case (the upper case member 11, the lower case
member 12, and the cover 13 constitute the case). There is. The opening hole H1 is provided at
an arbitrary portion of the case, and in the example of the present embodiment, is provided on
the upper surface of the case. Note that the microphone M may be attached at a position in
contact with the opening hole H1 as shown in the part surrounded by the dotted line in FIG. 2 or
as shown in the drawing drawn from the part surrounded by the dotted line in FIG. It may be
mounted on the control substrate KM below the opening hole H1 apart from H1. When the
microphone M is attached to a position in contact with the opening hole H1, as shown in FIGS. 2
and 3, it is preferable to sandwich the spacer S which is a thin plate-like elastic member whose
central portion is opened.
[0023]
In the speaker device 1 using the magnetostrictive element, since the vibration of the speaker
device itself is larger than that of the conventional cone-type speaker device, the generation of an
echo etc. is a concern, but the spacer S plays the role of an insulator. The vibration of the
transmitted case can be attenuated to suppress the generation of echo and noise. Further, by
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sandwiching the spacer S, the microphone M and the periphery of the opening hole H1 are
sealed, the sound in the case is difficult to be picked up by the microphone M, and the generation
of echo and noise can be suppressed. Further, the control means C1 performs software
processing such as echo cancellation processing and noise cancellation processing on the audio
input signal inputted from the microphone M, and outputs the processed audio input signal to
the communication means C2. As described above, the speaker device 1 described in the present
embodiment is configured to be smaller by using the magnetostrictive element, and the heat
generation of the magnetostrictive element is suppressed by using the temperature detection
means TS, and the microphone is made via the spacer S. By attaching M to the case, the
occurrence of echo etc. is suppressed and the reliability is further enhanced.
[0024]
The speaker device 1 of the present invention is not limited to the appearance, configuration,
structure, and the like described in the present embodiment, and various changes, additions, and
deletions can be made without departing from the scope of the present invention. Moreover,
when using the speaker apparatus 1 for reproduction | regeneration of an audio | voice, the
microphone M may be abbreviate | omitted. Further, the above (≧), the following (≦), the larger
(>), the less than (<), etc. may or may not include the equal sign. Further, the numerical values
used in the description of the present embodiment are an example, and the present invention is
not limited to these numerical values.
[0025]
The speaker device 1 described in the present embodiment can be applied to various applications
such as a hands-free device of a mobile phone, a telephone conference device, and a speaker for
a music reproduction device, for example.
[0026]
DESCRIPTION OF SYMBOLS 1 speaker device 11 upper case member 12 lower case member 13
cover 14 upper holder 15 lower holder 20 transmission rod 21 transmission ring 22 sheet
member 24 disc magnet 30 magnetostrictive element 31 coil 32 ring magnet 33 yoke C1 control
means C2 communication means C3 amplification means H1 Opening hole KM control board KS
sub board M microphone S spacer TS temperature detection means EX External device
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