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JPS62236300

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DESCRIPTION JPS62236300
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flat loudspeaker, and more particularly to a flat loudspeaker having a novel vibration source
drive system. 2. Description of the Related Art A piezoelectric speaker is an example of a type
that can be advantageously realized as a planar speaker. In a piezoelectric speaker, a
piezoelectric element is used as a means for converting electrical energy into mechanical energy,
and a suitable diaphragm is used to convert mechanical vibration of the piezoelectric element
into acoustic energy. That is, in the piezoelectric speaker, the piezoelectric element and the
diaphragm are mechanically coupled. [Problems to be Solved by the Invention] The abovementioned piezoelectric speaker can use a flat diaphragm and a thin piezoelectric element to
obtain an extremely thin planar speaker. . However, in general, in the piezoelectric speaker, the
piezoelectric element smaller than the area of the diaphragm is used, and the core is closely
attached to the diaphragm or mechanically coupled to the diaphragm using an appropriate
connection means. ing. Therefore, in the piezoelectric speaker, driving and braking from the
piezoelectric element are partially applied to the diaphragm, not to the entire surface. そのため
9. There is a limit to increasing efficiency, and the damping factor can not be so high.
Therefore, the present invention is intended to provide a flat type speaker which adopts a novel
driving method so as to drive the vibration source entirely and brake the entire surface, and is
suitable for thinning. [Means for Solving the Problems and Operation] The present invention
provides an i-th first and a second magnetic sheet which are arranged parallel to each other with
a space therebetween and relatively displaced in the surface direction, Drive means for driving
the first or second magnetic sheet to displace in the surface direction in response to an audio
signal, and orthogonal to the surface direction so as to use the first magnetic sheet as a vibration
source And support means for supporting the first magnetic sheet so as to be capable of
vibrating in the direction of movement. And, on the first and second magnetic sheets, magnetic
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signals whose magnetic potential changes along the direction of the displacement are recorded.
According to such a configuration, when the first and second magnetic sheets are relatively
displaced in the surface direction by the driving means, a force acting between the first and
second magnetic sheets according to the displacement. Changes. The change in force causes the
first magnetic sheet to vibrate in the direction orthogonal to the surface direction.
Since the change in force acting between the first and second magnetic sheets is correlated with
the audio signal input to the drive means, the vibration correlated with the audio signal is given
to the first magnetic sheet, and Sound energy is generated from the magnetic sheet of According
to the present invention, since magnetic signals can be recorded over the entire surface of each
of the first and second magnetic sheets, it changes according to the relative displacement of the
first and second magnetic sheets in the surface direction. The force acting between the first and
second magnetic sheets can be uniformly applied over the entire surface or substantially the
entire surface of the first and second magnetic sheets. Therefore, the first magnetic sheet as a
vibration source is driven on the entire surface, and the efficiency as a speaker is increased. In
addition, the first magnetic sheet is fully braked from the same point of view, and the damping
factor is excellent. Furthermore, since the first magnetic sheet as a vibration source moves
integrally as a whole, it is possible to obtain a speaker with low distortion and low distortion.
Furthermore, it is most remarkable that the thickness dimension of the speaker is substantially
determined by the distance between the respective outer surfaces of the first magnetic sheet and
the second magnetic sheet arranged in parallel. Therefore, it can be set as a very thin flat type
speaker, for example, a wall hanging can be used advantageously as a speaker for use. In
addition, the area of the first and second magnetic sheets can be arbitrarily set in accordance
with the application of the flat loudspeaker. Therefore, it is possible to design freely from a
relatively small area speaker to a large area speaker. FIG. 1 is a front view showing an
embodiment of the present invention in principle. The first and second magnetic sheets 1 and 2
are arranged in parallel with a distance from each other. In FIG. 1, the thickness direction of
these magnetic sheets 1 and 2 appears in the front. The first magnetic sheet 1 is connected at its
outer peripheral portion to the fixed portion 4 via, for example, an edge 3 subjected to
corrugation. Thus, the first magnetic sheet 1 is vibratably supported in the direction orthogonal
to the surface direction, that is, in the direction indicated by the double arrow 5. In addition, the
first magnetic sheet 1 maintains an appropriate distance from the second magnetic sheet 2 by
such a support mode. The second magnetic sheet 2 is mechanically coupled to the driving means
7 provided on the fixed portion 6. The driving means 7 is constituted of, for example, a
piezoelectric element or an electromagnetic driving means, whereby the second magnetic sheet 2
is driven to be displaced in the plane direction, that is, the direction indicated by the double
arrow 8.
On the first and second magnetic sheets 1.2, magnetic signals in which the magnetic potential
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changes with a constant period equal to each other are recorded along the direction of the
double arrow 8, respectively. In the illustrated embodiment, magnetic poles opposite to each
other are alternately arranged on the magnetic sheets 1 and 2 at equal and constant pitches,
such as N pole, S pole, N pole, and so on. . Further, when each of the magnetic sheets 1 and 2 is
viewed in plan, the N pole and the S pole extend in a band shape in the width direction (direction
orthogonal to the paper surface of FIG. 1) The poles and the south poles are distributed. Note
that, instead of such a magnetic pole distribution mode, for example, the magnetic poles may be
arranged in a check pattern. In order to record the magnetic signals as described above, the first
and second magnetic sheets 2 may be made of, for example, a sheet of plastic coated with ferrite
or a sheet of plastic mixed with ferrite. In the configuration shown in FIG. 1, an audio signal is
given to the driving means 7, and the driving means 7 gives the second magnetic sheet 2 an
operation in the direction of the arrow 8 according to the audio signal. The second magnetic
sheet 2 is thereby displaced in the surface direction with respect to the first magnetic sheet 1,
specifically in the direction of the arrow 8. The force acting between the first and second
magnetic sheets 1 and 2 changes according to such displacement. That is, with the displacement
of the second magnetic sheet 2 in the direction of the arrow 8, the first magnetic sheet 1 and the
second magnetic sheet 2 exert a repulsive force or attracts each other. Besides, the magnitude of
these forces also changes. Thus, the first magnetic sheet 1 supported by the edge 3 vibrates itself
to generate acoustic energy. FIG. 2 shows another embodiment of the present invention and is
drawn in the same manner as FIG. The first magnetic sheet 11 and the second magnetic sheet 12
shown in FIG. 2 have the same configuration as the above-described magnetic sheet 1.2. In this
embodiment, the first magnetic sheet 11 is connected to the fixing portion 14 via an edge 13
extending in the direction perpendicular to the surface direction of the magnetic sheet 11 near
the outer peripheral edge. The edge 13 is corrugated. Further, the second magnetic sheet 12 is
fixed to the fixing portion 15. Further, similarly to the edge 13, an edge 16 subjected to
corrugation is connected between the first magnetic sheet 1 and the second magnetic sheet 2.
The first magnetic sheet 11 is vibratably supported by the edges 13 and 16 in the direction
orthogonal to the surface direction, that is, the direction indicated by the double arrow 17.
Further, the first magnetic sheet 11 is maintained at an appropriate distance from the second
magnetic sheet 12 by the edges 13 and 16. The edge 16 may be connected not to the second
magnetic sheet 12 but to an appropriate fixing portion. Further, either one of the edge 13 and
the edge 16 may be omitted. A drive means 18 operating in response to the audio signal is
attached to the fixed part 19, which drive means 18 is connected to the first magnetic sheet 11.
Therefore, the first magnetic sheet 11 is displaced not only in the direction indicated by the
double arrow 17 but also in the plane direction, ie, the direction indicated by the double arrow
20. In the embodiment shown in FIG. 2, the driving means 18 displaces the first magnetic sheet
11 in the direction indicated by the double arrow 20. The force acting between the first and
second magnetic sheets 11.12 changes in accordance with this displacement. Due to this change
in force, the first magnetic sheet 11 similarly vibrates in the direction indicated by the double
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arrow 17 to generate acoustic energy. In FIG. 3, a first magnetic sheet 21 and a second magnetic
sheet 22 constituting still another embodiment of the present invention are shown in a partially
enlarged manner. This embodiment shows another aspect of magnetization, and each magnetic
sheet, 21 and 22 is magnetized in its thickness direction. However, as a result, an N pole and an S
pole appear alternately on the surfaces facing each other of each magnetic sheet 1 to 21 ° 22.
Therefore, these magnetic sheets 21.22 can be used as they are as a substitute for the magnetic
sheets 1 and 2 or the magnetic sheet 11.12 in the respective embodiments of FIGS. 1 and 2
described above. Furthermore, as an aspect of magnetization, although not shown, the following
example is also possible. That is, as shown in FIG. 3, while magnetizing in the thickness direction
of the magnetic sheet, areas to be magnetized and gap areas not to be magnetized are alternately
arranged, and for example, an area of N pole on one surface of the magnetic sheet. The
magnetization regions and the non-magnetization regions may alternately appear as in the nonmagnetization region, the N-pole region, and so on. In short, in the magnetic sheet used in the
present invention, a magnetic signal whose magnetic potential changes may be recorded along
the direction of displacement by the driving means. In each of the embodiments shown in FIG. 1
and FIG. 2, the first magnetic sheet 1 or 11 itself also serves as a diaphragm, but these first
magnetic sheets may be used as vibration sources. The diaphragm of may be added.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a front view showing an embodiment of the present invention in principle.
FIG. 2 is a front view showing in principle another embodiment of the present invention. FIG. 3 is
an enlarged view showing a part of first and second magnetic sheets 21. 22 used in still another
embodiment of the present invention. In the figure, 1, 11. 21 is a first magnetic sheet, 2. 22. 22
is a second magnetic sheet, 3. 13. 16 is an edge, 4, 14 is a fixing portion, and 7, 18 are driving
means. .
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