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JP2004080636

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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
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DESCRIPTION JP2004080636
An object of the present invention is to provide a lightweight, low-cost, nondirectional speaker
having a simple structure. A speaker (10) comprises a permanent magnet plate (12), a diaphragm
(14) disposed opposite to the permanent magnet plate (12), a pair of shock absorbing materials
(16) interposed on both sides of the diaphragm and a casing (18) And the entire external shape
exhibits a substantially sin curve in a plane. That is, in the speaker 10, the first curved portion
10a curved in a semicircular shape convex on the back side and the second curved portion 10b
curved in a semicircular shape convex on the front side are connected in series Is formed in a
shape exhibiting a substantially sin curve. Then, both front and back sides of the first curved
portion 10a and the second curved portion 10b serving as radiation surfaces of sound waves in
the speaker 10 face substantially omnidirectionally in two dimensions, and the speaker 10 has
360 ° non-directivity in the horizontal direction. Become. [Selected figure] Figure 2
スピーカ
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker in which sound waves generated by surface vibration of a diaphragm become
nondirectional. [0002] As a speaker of acoustic equipment, a permanent magnet plate in which
strip-like N and S poles are alternately formed on a plate surface, and an electric that extends
along the boundary area of the N and S poles. There has been proposed a thin flat speaker in
combination with a diaphragm in which wiring is formed on a plate surface. This thin flat plate
speaker can achieve weight reduction and space saving, has a strong directivity of the sound
wave radiated, and has a characteristic capable of transmitting the sound wave further. [0003]
Generally, in a speaker, since the sound wave to be emitted has directivity in a direction parallel
to the installation surface, the range in which good sound can be heard is limited. Then, although
there exist some which arrange | positioned many speaker units in the circumferential side of a
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cylindrical housing | casing, and implement | achieve non directivity, the problem which becomes
multiple sound sources while making this large is inherent. Therefore, a nondirectional speaker
device using a thin flat plate speaker advantageous for the reduction in weight and space is
proposed. However, even in this case, it is necessary to combine a plurality of permanent magnet
plates and a diaphragm so that the direction of the sound waves radiated is different, which
complicates the structure and increases the weight and cost. Will also cause problems.
SUMMARY OF THE INVENTION In view of the problems inherent in the above-described prior
art, the present invention has been proposed to suitably solve the problem and has a simple
structure, light weight and low cost. It aims at providing an omnidirectional speaker. [Means for
Solving the Problems] In order to solve the above-mentioned problems and suitably achieve the
desired purpose, the loudspeaker according to the present invention is characterized in that striplike N poles and S poles alternate on the plate surface. Loudspeaker including a permanent
magnet plate made of a bonded magnet formed in the above, and a diaphragm formed on the
plate surface with electrical wiring extending along the boundary region between the N pole and
the S pole in a casing That is, the invention is characterized in that a sound wave generated by
surface vibration of the diaphragm is formed in a curved shape which becomes nondirectional.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a loudspeaker according to
the present invention will be described by way of preferred embodiments with reference to the
attached drawings. FIGS. 1 and 2 show a loudspeaker according to an embodiment, wherein the
loudspeaker 10 comprises a permanent magnet plate 12, a diaphragm 14 disposed to face the
permanent magnet plate 12, and the diaphragm 14. The diaphragm 14 basically comprises a pair
of shock absorbing materials 16 interposed on both sides of the front and back, and a casing 18
for housing these, and the overall outer shape thereof exhibits a substantially sin curve in a plane
(FIG. 3) reference).
The permanent magnet plate 12 is a flexible bond magnet having a desired thickness (for
example, 2 mm) formed by mixing magnetic powder into a resin material, and a plate surface
facing the diaphragm 14. A strip-like N pole and an S pole are alternately formed on substantially
the entire of. Further, a large number of through holes 12a are formed in a predetermined
pattern in the boundary region between the N pole and the S pole. The diaphragm 14 is a thin,
flexible and flexible resin film, and the electric wiring 20 is printed in a meandering manner over
the entire surface of both the front and back sides, and the electric wiring is formed. The
reference numeral 20 is connected to a feed terminal portion 22 provided at the center of one
side of the diaphragm 14. Then, the diaphragm 14 and the permanent magnet plate 12 are
disposed so that the straight portions (portions other than the turn portion) of the electric wiring
20 alternately extend in the opposite direction along the boundary region of the N pole and the S
pole. Ru. In the embodiment, the front surface of the diaphragm 14 and the back surface of the
permanent magnet plate 12 are disposed to face each other, and when an AC signal is input to
the feeding terminal portion 22, the magnetic flux lines from the N pole to the S pole are crossed
each other. A force in the same direction acts on the front surface side or the back surface side
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(thickness direction) according to the polarity of the alternating current signal according to the
polarity of the alternating current signal on the electric wiring 20 extending in the opposite
direction according to Fleming's left hand rule. Configured to produce The cushioning material
16 interposed on both the front and back sides of the diaphragm 14 is soft and air permeable to
allow passage of sound waves, and is made of, for example, a non-woven sheet having
substantially the same size as the diaphragm It functions to prevent the generation of abnormal
noise and the like due to the contact between the plate 14 and the permanent magnet plate 12
and the base member 26 described later. As shown in FIG. 2, the casing 18 is composed of a
front cover member 24 and a rear base member 26 which are symmetrical before and after a flat
surface having a substantially sin curve, and both members 24 and 26 have outer
circumferences. It is formed in the shape of a container in which the inner peripheral portion
except for the flanges 24a and 26a having a fixed width is shallowly recessed and formed, and
the flanges are brought into contact with each other back and forth and fixed by fixing means
such as bolts. Is to be defined. The permanent magnet plate 12, the shock absorbing material 16,
the diaphragm 14 and the shock absorbing material 16, which are sequentially stacked from the
front side, have flanges 24a corresponding to the outer peripheral edge of the diaphragm 14
where the electrical wiring 20 is not formed. , 26a, and is accommodated in the space of the
casing 18. That is, the permanent magnet plate 12, the diaphragm 14 and the pair of shock
absorbing members 16 are accommodated in the space in a posture in which a substantially sin
curve is formed in a plane, following the shapes of the members 24 and 26.
In the embodiment, the N pole and S pole of the permanent magnet plate 12 and the straight
portion of the electric wiring 20 in the diaphragm 14 are set to extend in the horizontal direction,
but may be extended in the vertical direction as well. Good. Further, through holes 24b and 26b
are formed in the cover member 24 and the base member 26 so as to coincide with the through
holes 12a formed in the permanent magnet plate 12, and sound waves generated by the
diaphragm 14 are through holes It is configured to be efficiently radiated out of the casing 18
through 12a, 24b, 26b. As shown in FIG. 1, the speaker 10 having the casing 18 as an outer shell
has a first curved portion 10 a curved in a semicircular shape which is convex from one side (left
side in the drawing) to the back side (rear side) A second curved portion 10b that curves in a
semicircular shape that is convex from the other side (right side in the drawing) to the front side
(front side) is continuously provided, and has a shape exhibiting a substantially sin curve in a
plane. That is, both the front and back sides of the first curved portion 10a and the second
curved portion 10b, which are the radiation surfaces of the sound waves in the speaker 10, are
set so as to face substantially all directions in two dimensions. It is configured to have 360 °
omnidirectionality in the direction. Incidentally, in the loudspeaker 10 of the embodiment, as
shown in FIG. 3, the central angle of the arc portion in the both curved portions 10a and 10b is
set to 135 ° and the radius is set to 40 mm, but the value is arbitrarily changed It is possible.
Moreover, it is also possible to set the central angle and the radius of the first curved portion 10a
and the second curved portion 10b to be different. Next, the operation of the loudspeaker
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according to the above-described embodiment will be described. In the speaker 10, when an AC
signal is input to the feeding terminal portion 22, the diaphragm 14 is moved in the front-rear
direction according to the rule of the left of Fleming by the permanent magnet plate 12 and the
diaphragm 14 housed in the casing 18. Surface vibration generates sound waves. In this case,
since the diaphragm 14 and the casing 18 exhibit a substantially sin curve in a plane, and the
radiation surface of the sound waves is directed in all directions of 360 ° in the horizontal
direction, as shown in FIG. From there, sound waves are emitted in all directions in the horizontal
direction. In other words, the speaker 10 of the embodiment has a non-directivity of 360 ° in
the horizontal direction parallel to the installation surface of the speaker 10, and the range in
which good sound can be heard is not limited. Moreover, since the permanent magnet plate 12
and the diaphragm 14 are each formed of a single plate, the structure is simple with a single
sound source, weight reduction can be achieved, and the manufacturing cost can be reduced.
EXPERIMENTAL EXAMPLES Conventional Example 1 Using One Thin Flat Speaker In
Conventional Example 2 in which 1 and 2 thin flat speakers are combined in an L shape and the
invention examples according to the above-mentioned embodiments 4 (a), 5 (a) and 6 (a) show
the results of measuring the sound pressure characteristics in all directions in two dimensions
when AC signals of each frequency of 1 kHz and 2 kHz are input. Show. As shown in FIG. 4 (b),
the installation posture of the speaker in the conventional example 1 is 0 ° and 180 ° on the
front and the back, and the installation posture of the speaker in the conventional example 2 is
shown in FIG. The front and back surfaces of one of the speakers are oriented at 0 ° and 180 °,
and the front and back surfaces of the other speaker, which are orthogonal thereto, are oriented
at 90 ° and 270 °, as shown in FIG. Further, as shown in FIG. 6B, the installation posture of the
speaker in the invention example is set so that the inner peripheral surface of the first curved
portion faces 0 ° and the inner peripheral surface of the second curved portion faces 180 °. Be
done. In the first prior art, as shown in FIG. 4A, the sound pressure characteristics at 90 ° and
270 ° where the left and right end parts of the speaker face are particularly low, and the
variation in the sound pressure characteristics in all directions is large. In Conventional Example
2, high sound pressure characteristics can be obtained at 0 °, 90 °, 180 ° and 270 °, as
shown in FIG. 5A, in which the plate surfaces (front and back) of the two speakers face each
other. The sound pressure characteristics at 45 °, 135 °, 225 ° and 315 ° different
directions from the azimuth, ie 45 °, 135 °, 225 ° and 315 °, are low, and the sound
pressure characteristics in all directions still have variations. On the other hand, in the invention
example, as shown in FIG. 6A, it was confirmed that high sound pressure characteristics with less
variation (flattened) in almost all directions were obtained. [Another Embodiment] FIG. 7 shows a
loudspeaker according to another embodiment, and the basic configuration is the same, except
that the outer shape is a curved surface having a dome shape. ing. That is, in the speaker 28 of
this alternative embodiment, the cover member 24 and the base member 26 constituting the
casing 18 are formed in a dome shape, and in the space defined internally by combining the two
members 24 and 26, A dome-shaped permanent magnet plate 12, a diaphragm 14 and a pair of
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shock absorbing materials 16 are accommodated. Therefore, in the state where the speaker 28 is
placed on the floor surface, the surface emitting the sound waves is directed to all directions
above it, and omnidirectional omnidirectional in the upper direction from the floor surface. In
addition, when the speaker 28 is installed on the ceiling surface downward (in a state of being
convex downward), the speaker has omnidirectional omnidirectional characteristics in the lower
direction.
[Modifications] The external shape of the speaker according to the present invention is not
limited to the shapes of the above-described embodiments and other embodiments, and U, J, C
shapes and other free curved shapes are adopted. It can. Further, although the permanent
magnet plate is disposed only on one plate surface side (surface side) of the diaphragm in the
embodiment, a configuration in which permanent magnet plates are disposed on both plate
surface sides sandwiching the diaphragm can be adopted. Furthermore, the buffer material may
be in the form of a frame that contacts only the outer peripheral edge outside the formation area
of the electrical wiring in the diaphragm. As described above, according to the speaker of the
present invention, by making the permanent magnet plate and the diaphragm into a curved
surface shape, the sound waves generated by the surface vibration of the diaphragm become
nondirectional. The range in which a speaker can hear good sound is expanded. In addition, since
it can be constituted by a single permanent magnet plate and a diaphragm, the structure is
simple and light weight and low cost can be realized. BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic perspective view showing a speaker according to a preferred embodiment
of the present invention. FIG. 2 is a schematic perspective view showing the speaker according to
the embodiment in an exploded state. FIG. 3 is an explanatory view showing a shape of a speaker
according to an embodiment. FIG. 4 is a graph of an experimental example according to
Conventional Example 1 and an explanatory view of an installation posture. FIG. 5 is a graph of
an experimental example according to Conventional Example 2 and an explanatory view of an
installation posture. FIG. 6 is a graph of an experimental example according to the invention
example and an explanatory view of an installation posture. FIG. 7 is a schematic perspective
view of a loudspeaker according to another embodiment. Explanation of symbols 12 permanent
magnet plate 14 diaphragm 16 shock absorber 18 casing 20 electric wiring
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