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JP2011160050

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DESCRIPTION JP2011160050
The present invention relates to a speaker structure characterized in that vibrations from a
vibrating unit serving as a sound source can be efficiently transmitted to a diaphragm.
SOLUTION: A vibration unit which vibrates by an electric signal, a vibration unit fixing unit which
fixes the vibration unit, and a speaker casing provided with a closed chamber are provided. It is
connected and fixed to the outer peripheral part and fixed to the inner wall of the speaker of the
sealed chamber of the speaker housing, and the space surrounded by the vibrating surface of the
vibrating unit and the sealed chamber is filled with a fluid substance and opposed to the
vibrating surface of the vibrating unit The front surface of the speaker housing of the speaker
housing is characterized in that it is vibrated by the vibration of the vibrating portion. [Selected
figure] Figure 1
Speaker structure
[0001]
The present invention relates to a speaker structure, and more particularly to a speaker structure
characterized in that vibration from a vibrating portion serving as a sound source can be
efficiently transmitted to a diaphragm.
[0002]
BACKGROUND ART Loudspeaker speakers are conventionally known which are installed in
public facilities and the like and used to contact an outdoor person.
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1
For example, as in Patent Document 1, in order to ensure the safety of passengers at the station
home, such as at the time of entry and exit of a train, and at the time of door opening and closing,
station staff perform various guidance broadcasts through speakers installed at the station home.
The speakers used a large volume output to ensure that the information broadcast could reach
the passengers and station staff at the station home, and a plurality of speakers were installed so
as to reach a wider area.
[0003]
Patent Document 1: Japanese Patent Application Laid-Open No. 2004-064723
[0004]
However, since the above-mentioned speakers are installed in multiples so as to reach people
with a large volume output and people in a wide area, various guidance broadcasts reach not
only the station staff and passengers but also the neighborhood, which is annoying. It had
become.
[0005]
SUMMARY OF THE INVENTION In view of such problems, the present invention aims to provide
a speaker structure capable of outputting voice with high directivity, in order to convey various
information broadcasts only to station staff and passengers.
[0006]
In order to solve the above-mentioned subject, invention of Claim 1 comprises a vibration part
which vibrates by an electric signal, a vibration part fixed part which fixes a vibration part, and a
speaker case in which a sealed room is provided. The vibration part fixing part is connected and
fixed to the outer peripheral part of the vibration part and is fixed to the inner wall of the
speaker of the sealed chamber of the speaker housing, and the fluid is sealed in the space
surrounded by the vibrating surface of the vibration part and the sealed chamber. The front
surface of the speaker housing of the speaker housing which is filled with the substance and
faces the vibrating surface of the vibrating portion is characterized in that it is vibrated by the
vibration of the vibrating portion.
The invention according to claim 2 is constituted by an expansion and contraction part which is
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2
expanded and contracted by an electric signal, and a speaker housing provided with a closed
chamber, and the expansion and contraction part is generated from a coil generating a magnetic
field and a coil. A speaker composed of a magnetostrictive element whose element size is
changed by the magnetic field, fixed to the inner wall surface of the sealed chamber of the
speaker housing, filled with a fluid substance in the sealed chamber including the extended
portion, and fixed the expandable portion The front surface of the speaker housing of the
speaker housing facing the inner wall is characterized in that it is vibrated by the expansion and
contraction of the expansion and contraction part.
[0007]
According to the speaker structure of the present invention, the propagation speed of the sound
wave is increased by filling the inside of the case with the fluid substance, and the plane wave
can be output by the sound wave from the point sound source being uniformly applied to the
front surface of the case. .
[0008]
It is a structural view of the 1st speaker structure concerning the present invention.
It is a block diagram of the 2nd speaker structure which concerns on this invention.
[0009]
Hereinafter, a preferred embodiment of the speaker structure of the present invention will be
described with reference to the drawings.
FIG. 1 shows a speaker structure according to a first embodiment of the present invention, in
which a vibration unit 101 vibrating with an electric signal, a vibration unit fixing unit 103 for
fixing the vibration unit 101, and a speaker provided with a closed chamber 1001 It comprises a
housing 100 and a fluid substance 102 for transmitting the vibration of the vibrating portion
101 to the speaker inner wall 1002 of the speaker housing 100.
The outer peripheral portion of the vibrating portion 101 is connected and fixed to the vibrating
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portion fixing portion 103, and the vibrating portion fixing portion 103 is fixed to the speaker
inner wall 1002 of the closed chamber 1001 of the speaker housing 100. The fluid substance
102 is filled in a space surrounded by the vibrating surface 1011 of the vibrating unit 101 and
the closed chamber 1001 of the speaker housing 100.
[0010]
The operation principle of the first embodiment of the present invention will be described. When
an audio signal is sent from the wiring (not shown) to the vibration unit 101, the vibration
surface 1011 of the vibration unit 101 vibrates. Then, due to the vibration of the vibration
surface 1011, the vibration is transmitted to the fluid substance 102 filled in the closed chamber
1001, for example, a high density fluid substance such as water. At this time, pressure is applied
to the inner wall 1002 of the speaker housing from the space surrounded by the sealed chamber
1001 and the vibrating portion fixing portion 103. Then, the front surface 1003 of the speaker
housing inner wall 1002 vibrates more easily than the other portions of the speaker housing
100, and therefore the pressure from the fluid substance 102 is transmitted and output as a
sound. At this time, since the sound propagation speed is increased by being filled with the fluid
substance 102, pressure is uniformly applied to the speaker inner wall 1002 of the front surface
1003 of the speaker housing, and a plane sound wave is output. Although pressure is applied to
the speaker inner wall 1002 from the space (air) of the sealed chamber 1001 not filled with the
fluid substance 102, the speaker housing 100 excluding the front surface 1003 of the speaker
housing is difficult to vibrate, so the sound is output There is nothing to do.
[0011]
FIGS. 2 (a) and 2 (b) show a speaker structure according to a second embodiment of the present
invention, in which a stretchable portion 104 that stretches and vibrates by an electric signal, a
speaker housing 100 provided with a closed chamber 1001, The fluid substance 102 is for
transmitting the vibration of the portion 104 to the inner wall 1002 of the speaker of the
speaker housing 100. The fluid substance 102 is filled in a space surrounded by the expansion /
contraction portion 104 and the closed chamber 1001 of the speaker housing 100. In addition,
the expansion and contraction unit 104 is configured of a giant magnetostrictive element 1042
that is expanded and contracted by a magnetic field, and a coil 1042 that generates a magnetic
field from an electric signal from a wire (not shown).
[0012]
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The second operation principle of the present invention will be described. When an audio signal
is sent from the wiring (not shown) to the expansion and contraction unit 104, the volume of the
expansion and contraction unit 104 itself expands and contracts. Then, when pressure is applied
to the fluid substance 102 filled in the closed chamber 1001, for example, a fluid substance with
high density such as water, by the expansion and contraction of the expansion and contraction
part 104, the fluid substance 102 will exert pressure on the inner wall 1002 of the speaker
housing . Then, the front surface 1003 of the speaker housing inner wall 1002 vibrates more
easily than the other portions of the speaker housing 100, and therefore the pressure from the
fluid substance 102 is transmitted and output as a sound. At this time, since the fluid substance
102 is uniformly pressurized on the speaker inner wall 1002 of the front surface 1003 of the
speaker housing, a plane sound wave is output. Although pressure is applied to the speaker inner
wall 1002 from the space (air) of the sealed chamber 1001 not filled with the fluid substance
102, the speaker housing 100 excluding the front surface 1003 of the speaker housing is
difficult to vibrate, so the sound is output There is nothing to do.
[0013]
By using the above-described speaker, it is possible to output highly directional sound.
[0014]
100 ... speaker housing 1001 ... sealed room 1002 ... speaker inner wall 1003 ... speaker housing
front surface 101 ... vibration part 1011 ... vibration surface 102 ... fluid substance 103 ...
vibration Fixed part
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