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JPH11113086

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH11113086
[0001]
TECHNICAL FIELD The present invention relates to a speaker.
[0002]
A conventional loudspeaker comprises a cone-shaped diaphragm, a transducer for vibrating the
diaphragm, and an enclosure (speaker box) and a buckle (plate-like one) in which the diaphragm
and the transducer are housed. ing. The transducer is disposed at the center of the cone-shaped
diaphragm and vibrates the diaphragm based on the sound reproduction signal.
[0003]
Furthermore, flat type speakers having a flat diaphragm are also known. The cone-shaped
diaphragm is made of a relatively hard material and generates sound generally by piston
movement, whereas the flat diaphragm is made of a relatively soft material and generates sound
due to bending waves. For example, WO 97/09842 discloses a flat type speaker having a flat
diaphragm.
[0004]
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1
The conventional loudspeaker is placed on the floor, shelf or the like and is maintained in a fixed
position without changing the angle to the listener. In general, the speakers are placed at the
corners of a room or square and are not moved during use. Conventional speakers have a
uniform appearance and are not foldable. Also, the higher the sound quality of the speaker, the
larger the shape.
[0005]
An object of the present invention is to provide a foldable speaker.
[0006]
SUMMARY OF THE INVENTION In the present invention, the shape of the speaker can be
changed by using a diaphragm whose shape can be changed.
As a result, the speaker unfolds at the time of listening to form a vibrating surface, but is folded
at the time of storage or transportation, resulting in a speaker that takes up no space. The
speaker according to the first aspect of the present invention for achieving this comprises a
hollow structure diaphragm of a flexible material, and generates sound by vibrating in a state
where the hollow portion is filled with an object, and takes out the object of the hollow portion It
is characterized in that the shape can be changed.
[0007]
A speaker according to the second aspect of the present invention for achieving this comprises a
foldable frame and a diaphragm made of a film-like material attached to the frame, and the frame
is extended to expand the diaphragm. In this state, the diaphragm is vibrated to generate a
sound, and the frame is folded to change the shape of the diaphragm.
[0008]
A speaker according to a third aspect of the present invention is characterized in that a plurality
of diaphragms are connected, the plurality of diaphragms are folded when not in use, and the
plurality of diaphragms are expanded when in use.
[0009]
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2
1 and 2 show a speaker 10 according to a first embodiment of the present invention.
The speaker 10 has a diaphragm 12 and a drive unit 14.
The drive unit 14 is mounted near the lower end of the central portion of the diaphragm 12. The
lower end portion of the diaphragm 12 is attached to the speaker stand 16 directly or via a shock
absorbing material.
[0010]
The diaphragm 12 is made of a flexible material as a hollow structure, and vibrates in a state
where the hollow portion (air chamber) is filled with an object (for example, air) to make a sound
and take out the hollow portion (air). It is characterized in that the shape can be changed. For
example, the diaphragm 12 is made of vinyl resin in a structure having a plurality of air
chambers in the form of a beach mat, and is developed into a flat panel structure as shown in
FIG. 1 by filling the air chambers with air. In this state, a reproduction signal can be sent to the
drive unit 14 to vibrate the diaphragm 12 to function as the speaker 10.
[0011]
When not in use, as shown in FIG. 2, by evacuating the air chamber, the portion of the diaphragm
12 can be folded and rolled up to change its shape and reduce its volume. As a result, the
speaker 10 can be made space-saving during storage and transportation. Also, by applying this
technology to beach mats and floats, it is possible to realize beach mats and floats for listening to
music.
[0012]
A film of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polypropylene (PP)
can be used as a material of such a diaphragm 12, and a sheet of such resin is formed into a bag
to form an air chamber. Form a vented air port. An appropriate broken line may be formed in
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3
order to fold the diaphragm 12 into a predetermined shape.
[0013]
FIG. 3 is a view showing an example of the drive unit 14. The drive unit 14 is of the type having a
voice coil 18 and a permanent magnet 20. The voice coil 18 is fixed to the vibrating body 12.
The permanent magnet 20 is attached to the yoke 22, and the yoke 22 is attached to the frame
26 via the cushioning material 24. The frame 26 is fixed to the diaphragm 12 via the buffer 28 at
a point different from the fixing point of the voice coil 18 to the diaphragm 12.
[0014]
When current flows from the reproduction signal generating means to the voice coil 18, relative
motion occurs between the voice coil 18 and the permanent magnet 20, and the relative motion
vibrates the diaphragm 12 to generate sound. The operation of such a drive unit 14 is known,
and any type of drive unit 14 other than that shown can be used.
[0015]
4 to 6 are views showing a speaker 10 according to a second embodiment of the present
invention. The speaker 10 has a diaphragm 12 and a drive unit 14. The drive unit 14 is mounted
near the lower end of the diaphragm 12. The lower end portion of the diaphragm 12 is attached
to the speaker stand 16 directly or via a shock absorbing material. Also in this embodiment, the
diaphragm 12 is formed of a sheet of flexible material.
[0016]
In this embodiment, the speaker stand 16 is formed in a shape corresponding to the lower half of
the box, and a case 30 corresponding to the upper half of the box is pivotally attached to the
speaker stand 16 at the pivoting portion 32. The diaphragm 12 is attached to the foldable frames
34,36. The frames 34 and 36 are formed in a frame shape surrounding the diaphragm 12 and
are pivotally connected to each other at a pivoting portion 38 located on the horizontal center
line of the diaphragm 12. Also, the lower frame 36 is pivotally attached to the speaker stand 16
11-05-2019
4
at the pivoting portion 32.
[0017]
The diaphragm 12 is formed of a sheet of a flexible film-like material, ie, a resin, similar to that
described in the previous embodiment, and the frames 34, 36 are formed of metal. The drive unit
14 is attached to the diaphragm 12 below the pivot 38 so that the diaphragm 12 can be folded
together with the frames 34,36. In this embodiment, the diaphragm 12 is folded in half, but may
be folded in three. Alternatively, the frames 34 and 36 may be umbrella-shaped frames or frames
having a flexible structure that can be inflated with air.
[0018]
FIG. 4 shows the operating state of the speaker 10. The speaker stand 16 and the case 30 are
straight in a horizontal plane, and the frames 34 and 36 are straightly stretched in a vertical
plane. Then, the diaphragm 12 is extended in a flat state together with the frames 34 and 36. As
shown in FIG. 7, the diaphragm 12 is not fixed to the frame 34, 36 near the pivot 38 and may sag
slightly near the pivot 38 when the frames 34, 36 are folded. Although this can be done, as
shown in FIG. 4, when the frames 34 and 36 are stretched in a straight line, the diaphragm 12 is
spread and tension is applied to the diaphragm 12. The diaphragm 12 made of resin functions as
a diaphragm under tension, and generates a sound by the reproduction signal. This is the same
as in the previous embodiment.
[0019]
FIG. 5 is a view showing an intermediate state in which the frames 34 and 36 are folded. The
frame 34 is bent to the speaker stand 16 side, and the frame 36 is bent to the opposite side. At
this time, as shown in FIG. 7, the diaphragm 12 can sag slightly near the pivot 38, thereby
preventing the diaphragm 12 from being subjected to an excessive force. FIG. 6 is a view
showing the frames 34 and 36 in a completely folded state. The frame 34 overlaps the bottom of
the speaker stand 16, and the frame 36 overlaps the frame 34. Therefore, the case 30 can be
moved to cover the frame 36, and the speaker 10 can be closed in the form of an attache case
and carried or transported.
11-05-2019
5
[0020]
FIG. 8 is a view showing a modification of the diaphragm 12 used in the embodiment of FIG. 4 to
FIG. While the diaphragm described in FIG. 7 is flexible and can be bent, the diaphragm in FIG. 8
is formed of a material that is not suitable for bending. In this case, the diaphragm 12 is formed
of two panels 12X and 12Y. The two panels 12X and 12Y are attached to the frames 34 and 36
respectively, and when the two panels 12X and 12Y are linearly extended, the two panels 12X
and 12Y are also linearly extended and approached. When the ends are in firm contact with each
other and the two panels 12X, 12Y are folded, the two panels 12X, 12Y are also folded so that
the adjacent ends do not necessarily come in firm contact and excessive force is exerted. To
prevent.
[0021]
In the first embodiment, the internal pressure can be changed by adjusting the air pressure fed to
the air chamber of the diaphragm 12. In the second embodiment, the pressure applied to the
diaphragm 12 can be adjusted at the attachment portion between the diaphragm 12 and the
frames 34 and 36. By performing such adjustment, it is possible for the user to finely adjust the
sound quality.
[0022]
Furthermore, such adjustments can be made automatically by the motor. For example, as shown
in FIG. 9, there are an audio input terminal and a video input terminal, which are connected to
the input selector. When either an audio or video signal is input, the signal is automatically
selected. When a signal is input to the video input terminal, the tension is lowered and the signal
is input to the audio input terminal. If it is, restore tension. When both are simultaneously input,
the user explicitly selects a signal by the selector. As a result, the tension control unit controls the
motor to change the tension of the diaphragm 12.
[0023]
As described above, the sound quality can be adjusted by automatically adjusting the tension
according to the input signal, and a sound that is easy for the user to hear can be output. Besides
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6
this, the internal pressure of the speaker can be adjusted by combining the compressor shown in
the first embodiment with a compressor and controlling the same. This enables automatic
adjustment of the sound quality. A box-like speaker stand 16 is disposed at the bottom of the
frames 34 and 36 of the speaker 10 of the second embodiment. The speaker stand 16 has a
hollow structure and can accommodate the frames 34 and 36, the diaphragm 12 and the drive
unit 14 after being folded. Thereby, the main body of the speaker 10 can be protected at the time
of storage and transportation.
[0024]
In addition, the frames 34 and 36 of the speaker 10 of the second embodiment can be driven by
a motor so that expansion and folding can be performed by control of the motor. As an initial
operation in which the speaker 10 is energized, the diaphragm 12 of the speaker is developed.
Further, the diaphragm 12 of the speaker is accommodated as an end operation when the power
is turned off. Thus, the speaker 10 can be automatically deployed and folded. In this example,
both of the deployment and the folding of the speaker 10 are automatically performed. However,
any of the deployment and the folding of the speaker 10 can be automated by a simple method
such as using a spring force. These techniques are expected to improve the portability of all
portable devices having a voice output function, such as portable terminals such as mobile
phones and notebook computers, radio cassette players, and the like.
[0025]
Moreover, the state disassembled to the structure of the diaphragm 12, the drive unit 14, and the
flame | frames 34 and 36 can be assembled, and it can be set as a speaker. By providing a
plurality of types of diaphragms of different materials and shapes to such a speaker, the user can
select free parts and create a speaker having a sound quality and a shape preferred by the user.
[0026]
As described above, according to the present invention, it is possible to realize a speaker which
expands to form a large diaphragm at the time of listening, but does not take up a place at
storage or transportation.
[0027]
Brief description of the drawings
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7
[0028]
1 is a diagram showing a speaker of the first embodiment of the present invention.
[0029]
2 is a diagram showing a folded state of the speaker of FIG.
[0030]
3 is a diagram showing an example of a drive unit.
[0031]
4 is a diagram showing a speaker of the first embodiment of the present invention.
[0032]
5 is a diagram showing an intermediate state in which the frame of the speaker of FIG. 4 is
folded.
[0033]
6 is a diagram showing a state in which the frame of the speaker of FIG. 4 is completely folded.
[0034]
7 is a diagram showing an example of the diaphragm 12 used in the embodiment of FIG. 4 to FIG.
[0035]
8 is a view showing a modification of the diaphragm 12 used in the embodiment of FIG. 4 to FIG.
[0036]
<Figure 9> It is the flowchart which shows the example which applies tension to the diaphragm.
[0037]
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8
Explanation of sign
[0038]
10: Speaker 12: Diaphragm 14: Drive unit
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9
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