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JP2007201974

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DESCRIPTION JP2007201974
An existing flat speaker structure in which a plurality of small piece magnets are arranged in a
grid shape and a circuit is set in a spiral or zigzag form along the small piece magnets on the
vibrating film surface is a partial divided vibration of the vibrating film. Encourage A plurality of
annular magnets are arranged on a flat yoke surface concentrically with a constant gap so that
the polarity is sequentially changed. A conductive circuit is spirally formed on the vibrating film
surface adjacent to the annular magnet group so as to be orthogonal to the magnetic flux
direction formed by the annular magnet group. The conductive circuit is set to turn along the
outer periphery and the inner periphery of each annular magnet, but the direction is also
reversed whenever the horizontal magnetic flux direction of the annular magnet is inverted. The
conductive circuit passes through holes located near the center of the innermost annular magnet,
and repeatedly spirals like the surface toward the outer periphery on the opposite surface (back
surface) of the diaphragm, reaching the output terminal Do. By combining the annular magnet
and the spiral conductive circuit, it is possible to form a vibrating film having a physically flat
holding power. [Selected figure] Figure 1
Annular circuit flat speaker
[0001]
The present invention relates to the formation of a circuit on a vibrating membrane that
contributes to the improvement of the performance of a planar acoustic transducer (gamson type
planar speaker).
[0002]
In the Gamuzon-type flat speakers currently put into practical use, the conductive circuit of
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aluminum or copper foil is set to be orthogonal to the magnetic flux by a method such as etching
on any thin film-like substrate surface, and the circuit is energized. Is a method of reproducing
sound by means of
[0003]
The above-mentioned flat speakers include a method of arranging rod-like magnets and a method
of arranging square-shaped small piece magnets in a grid pattern.
The former bar magnet system is widely used as a tweeter for high frequency band reproduction
and is not a target of the performance improvement of the present invention because its
amplitude is minimal.
The latter method of arranging small piece magnets in a grid pattern is mainly used for
reproduction of a wide band as a medium-sized / large-sized flat speaker.
[0004]
A flat film-like diaphragm material is used for the flat speaker by the method of arranging the
small piece magnets in a grid pattern in relation to the acoustic conversion efficiency.
Furthermore, the method uses leakage flux in the horizontal direction with respect to the magnet
surface, and inevitably suffers from the influence of the mixed magnetic flux in the vertical
direction (the force to twist the vibrating membrane). In particular, medium- and large-sized flat
speakers that attempt to reproduce up to the mid-low range vibrate from the place where the
amplitude width is also necessary to the shape retention of the entire diaphragm, supply of
homogeneous horizontal magnetic flux, suppression of magnetic flux influence in the vertical
direction, etc. It is associated with good driving of the membrane.
[0005]
In all flat-panel speakers in which small magnets are arranged in a grid pattern, a conductive
circuit is set on the vibrating film along the small magnets, ie, spiral around the small magnets. A
scheme is employed in which a conductive circuit circulates in a zigzag manner.
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[0006]
In such a method, since the conductive circuits set around each small piece magnet vibrate
individually and independently, the horizontal shape holding power of the entire vibrating
membrane is weak, and the influence of the magnetic flux in the vertical direction is exerted. It is
likely to be susceptible to vibration and vibration.
The structure in which the conductive circuit vibrates individually and independently for each
small piece magnet is also disadvantageous for suppressing the resonant motion at the resonance
point of the vibrating membrane in the middle range. Patent number: P3159714 Patent
publication number: 2003. 179994
[0007]
The vibrating membrane of the Gamuzon flat speaker is composed of a thin and light polymer
film and a conductive circuit of a harder metal foil (aluminum or copper foil) laminated on the
film surface. The shape holding power of the entire diaphragm at the time of sound reproduction
depends almost entirely on the structural rigidity of the conductive circuit. The above-mentioned
flat speaker is composed of a conductive circuit on a vibrating membrane that spirals or zigzags
around the plurality of small piece magnets, and one small piece magnet and one conductive
circuit to go around it are included. It is structured to form an individual speaker. The structure
regarded as an assembly of individual small loudspeakers means that a part of the diaphragm
surface is carrying out individual and independent sound reproduction vibration.
[0008]
In the small piece magnet used in the above flat speaker, the magnet surface facing the vibrating
membrane has a square shape, and the square shaped magnets are arranged on the yoke like a
grid. A conductive circuit that circulates in a spiral or zigzag around the square shaped magnet is
set on the vibrating film. When the horizontal magnetic flux of the magnets arranged in a grid on
the yoke is measured at the position of the vibrating film surface, high magnetic flux values can
be obtained at the center of the sides of the square magnet, but it approaches the corner of the
square magnet The magnetic flux value decreases rapidly according to. This indicates that the
conductive circuit around the square magnet has different magnetic flux values depending on the
position, and high and low magnetic flux values are scattered. When a current is applied to the
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conductive circuit, a large force is received at a high magnetic flux value, and a small force is
received at a low magnetic flux value, so that the entire conductive circuit is not equally stressed.
In other words, many uneven wave motions occur on the vibrating membrane surface.
[0009]
In summary, the planar speaker described above has a structure of an assembly of individual
small speakers, so the rigidity of the whole vibrating membrane surface is weak and the shape
holding power of the whole vibrating membrane surface is difficult, so that it is a structure easy
to perform divided vibration. It has become. In addition, local nonuniform vibrations occur
because of the uneven forces obtained at the small parts of the individual small speakers. The
combined cause of these two reasons and the effect of the vertical flux is the coming concern of
the vibrating division of the vibrating membrane and the complex wave motion at the membrane
surface. By improving these negative factors, that is, by more even distribution of magnetic flux
and rigidity of the entire vibrating membrane surface, it is possible to drive the integral
diaphragm in phase, and improve the acoustic conversion efficiency, distortion. And the
suppression of the resonant motion at the resonant point of the vibrating membrane.
[0010]
In the present invention, a system in which small magnets are not arranged in a grid pattern is
avoided, and a single annular magnet or a plurality of annular magnets having different sizes are
arranged concentrically on a yoke having a predetermined area. By arranging the magnets in this
manner, one spiral conductive circuit can be set on the entire vibrating membrane surface. The
division vibration and the wave motion are easily suppressed by distributing the horizontal
magnetic flux more evenly to the whole conductive circuit and the physical property of the
conductive circuit material with high rigidity.
[0011]
One annular magnet is placed on one side of a flat yoke, or a plurality of annular magnets having
substantially the same thickness and width and different sizes are concentrically arranged. The
smallest annular magnet is placed at the center (or one flat magnet may be placed only at the
center), and the next smaller annular magnet is placed one after the other so as to be located on
the outer periphery of the smallest (annular) magnet. Install the largest annular magnet at the
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outermost circumference.
[0012]
In each annular magnet, the joint surface with the yoke and the opposite magnet surface
(predetermined magnet surface) form an N-S pole. The polarities of the adjacent magnets become
different from each other on a predetermined magnet surface, and the intervals between the
adjacent annular magnets are set to be substantially equal.
[0013]
A vibrating membrane is installed parallel to the predetermined magnet surface and at a position
slightly away from the predetermined magnet surface. A conductive circuit is formed on one side
or both sides of the vibrating film so as to be orthogonal to the horizontal magnetic flux direction
formed by the plurality of annular magnets.
[0014]
The conductive circuit has an input terminal in the vicinity of the outer side of the diaphragm,
and a predetermined direction (clockwise or clockwise) around the outer periphery of the
annular magnet located at the outermost periphery along the outer periphery. The conductive
circuit is led to the inside of the outer edge portion of the annular magnet installed at the
outermost periphery. Further, the conductive circuit traverses the magnet substantially at right
angles to the width direction at a stage where the conductive circuit turns inward to a
predetermined distance from the outer edge of the outermost annular magnet, and is led to the
inner edge of the outermost annular magnet.
[0015]
Furthermore, the conductive circuit led to the inner edge portion of the outermost annular
magnet reverses its winding direction and turns around the inner periphery in the direction
opposite to the predetermined direction, and the second one viewed from the outer periphery
side It circulates in the same direction to the vicinity of the outer edge of the annular magnet. In
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the case of one annular magnet, a conductive circuit is led to the back surface of the vibrating
film through the through hole at the time when it is circulated a predetermined number of times
in the vicinity of the inner edge.
[0016]
Similarly, when the position of the conductive circuit is turned inward to a predetermined
distance from the outer edge of the second annular magnet, the second annular magnet is
crossed substantially at right angles to the width direction, and the second annular magnet is It is
guided to the inner edge side of the ring, reverses the winding direction of the conductive circuit
again, and turns around the inner edge of the annular magnet in a predetermined direction along
the inner periphery.
[0017]
Repeating the winding method of the conductive circuit sequentially as described above, the
conductive circuit reaches the vicinity of the inner edge of the annular magnet located on the
innermost circumference.
A through hole is set in the vicinity of the center of the annular magnet located on the innermost
circumference, and the conductive circuit is led to the opposite surface (rear surface) of the
vibrating membrane.
[0018]
The conductive circuit led to the back surface of the vibrating membrane is the inner edge
portion of the annular magnet located at the innermost circumference in the same direction as
the circling direction of the conductive circuit at the same position on the surface (as viewed
from the surface side of the vibrating membrane). Starting from circling the vicinity, this time
from the inner circumference side to the outer circumference side, the circumferential direction
is reversed each time the magnet is traversed in the width direction in the same manner as
described above, and the outer and outer edges of the plurality of annular magnets are While
rotating, it reaches the output terminal near the outer side of the diaphragm. The input terminals
and the output terminals are respectively set on both sides of the diaphragm, and the through
holes connect the input terminals on both sides and the output terminals to each other.
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[0019]
By setting the circulating circuit as described above, the conductive circuit is set at a position
orthogonal to the horizontal magnetic flux formed by the plurality of annular magnets, and when
the current flows, all in the same direction (the upper direction of the predetermined magnet
surface or Downward)). When an acoustic signal which is an alternating current flows, the
conductive circuit vibrates up and down to cause an operation of reproducing the sound.
[0020]
The vibrating membrane of the Gamuzon flat speaker is composed of an ultrathin polymer film
and a conductive circuit of hard metal foil (aluminum or copper foil) formed on the film surface.
The integral drive (in-phase drive) of the vibrating membrane surface when the vibrating
membrane vibrates largely depends on the shape holding power of the entire vibrating
membrane.
[0021]
The present invention avoids a method of arranging small pieces of magnet in a grid pattern, and
forms a plurality of annular magnets different in size on a yoke of a certain area concentrically,
that is, around another annular magnet. A sequential arrangement was adopted so that two
annular magnets would surround. By arranging the annular magnets in this manner, it is possible
to comprehensively set one (in series) spiral conductive circuit over the entire diaphragm surface.
[0022]
In the flat speaker system in which small pieces of magnet are arranged in a grid, spiral or zigzag
conductive circuits on the vibrating membrane surface can be easily driven partially and
independently. That is, it has an aggregate structure in which division vibration easily occurs. On
the other hand, in the ring-shaped conductive circuit according to the present invention, a series
of concentric spiral circuits are set over the entire vibrating membrane surface. The conductive
circuit, which circulates several times on the entire surface of the vibrating membrane, has a
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structure in which the rigidity of the metal foil strongly holds the shape of the entire vibrating
membrane, and the planar shape of the entire vibrating membrane physically becomes even
when the vibrating membrane is driven. Good at holding constant.
[0023]
Furthermore, in the grid-like magnet arrangement, although a high horizontal magnetic flux
value is shown at the center of the square-shaped magnet side, the magnetic flux value rapidly
decreases as it approaches the corner of the magnet. On the other hand, in the magnet
arrangement according to the present invention, the value of the horizontal magnetic flux hardly
changes depending on the position of the magnet side, and the uniform horizontal magnetic flux
is supplied to the entire annular circuit. In the former planar speaker, an uneven force is applied
to a part of the circuit to cause split vibration. On the other hand, in the flat speaker according to
the present invention, since the substantially uniform force is applied over the entire annular
circuit, the entire vibrating membrane surface can be easily integrated and driven in phase.
[0024]
The conductive circuit according to the present invention is in the form of an annular circuit
covering the entire vibrating membrane, and has a structure in which the shape holding power of
the entire vibrating membrane is strong due to the rigidity of the conductive circuit material. As a
result, the resonance movement of the vibrating membrane is suppressed while the influence of
the magnetic flux in the vertical direction, that is, the force of twisting the vibrating membrane
surface is reduced.
[0025]
For the reasons described above, the flat speaker according to the present invention is superior
to the flat speaker method in which small pieces of magnets are arranged in a grid, the shape
holding power of the whole vibrating membrane is excellent, and divided vibration hardly occurs.
The acoustic conversion efficiency is high, distortion is small, and wavy vibration on the surface
of the vibrating film at the resonance point of the vibrating film is also reduced.
[0026]
Two examples according to the present invention are shown below.
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[0027]
FIG. 1 is a conceptual cross-sectional view of a flat loudspeaker according to the present
invention, showing an enlarged view of a portion surrounded by a broken line in FIG. 2 which is
also a conceptual cross-section of a flat loudspeaker of an annular circuit.
1 and 2 are also cross-sectional views of the center line of FIG. 3 (arrangement diagram of yoke
and annular magnet) and FIG. 4 (annular circuit diagram on vibrating membrane).
[0028]
FIG. 3 shows a state in which a square-shaped annular magnet 1c, 1d, 1e, 1f and 1g processed
with a neodymium magnet is installed on a flat plate-like yoke 1a surface provided with a large
number of ventilation holes 1b. There is.
The thickness of all the annular magnets is 3 mm, the width is 5 mm, and N-S poles are
magnetized in the thickness direction. Among the annular magnets in FIG. 3, 1c, 1e and 1g are S
poles on a predetermined surface (surface), and 1d and 1f are N poles. That is, the adjacent
annular magnets are arranged to have different polarities, and the gap between the adjacent
magnets is set to 5 mm.
[0029]
The vibrating membrane 1i of FIG. 4 is placed close to the annular magnet face placed as
described above. The vibrating film 1i is bonded to a 5 mm thick spacer 1j set on the periphery
of the yoke and its position is fixed. The gap between the predetermined surface of the annular
magnet and the vibrating film surface is 2 mm.
[0030]
A conductive circuit 1h as shown in FIG. 4 is set on both sides of the vibrating membrane 1i. The
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conductive circuit starting from the input terminal near the outer periphery of the diaphragm
moves around the outer edge of the magnet 1g twice around the back of the clock, moves to the
inner edge of the magnet 1g, and further near the inner edge of the magnet 1g To the vicinity of
the outer edge portion of the magnet 1 f, the circuit is reversed five times clockwise by reversing
the circuit direction. Thereafter, the conductive circuit is operated from the vicinity of the inner
edge of the magnet 1 f to the vicinity of the outer edge of the magnet 1 e, the vicinity of the inner
edge of the magnet 1 e to the vicinity of the outer edge of the magnet 1 d, the vicinity of the
inner edge of the magnet 1 d to the vicinity of the outer edge Furthermore, it turns around the
inner edge part vicinity of the magnet 1c, inverting the winding direction each time, and is led to
the through hole near the center.
[0031]
The conductive circuit that has passed the through hole near the center and reaches the opposite
surface (rear surface) of the vibrating membrane circulates from the inner circumferential side to
the outer circumferential side of the circuit, and (as viewed from the same direction of the
vibrating membrane) In order to turn around in the same direction at the same position of the
circuit and the vibrating membrane, inversion / turning is repeated each time to reach the output
terminal near the outer side of the vibrating membrane.
[0032]
The positional relationship between the conductive circuit and the annular magnet set in this
manner is shown in FIG.
When a direct current is input, the circuit portion in which the direction of the current flow at
each position of the conductive circuit 1h is a current in the direction from the front to the back
of FIG. 1 is a white circuit. The portion of the circuit that is to be the current is shown as a black
circuit.
[0033]
On the other hand, the direction of the horizontal magnetic flux at the same position is shown in
FIG. 1 with respect to the direction of current flow at each position. Since the magnetic flux is
directed from the north pole to the south pole, the magnetic flux from the magnet 1d to the
magnet 1c and the magnetic flux from the magnet 1f to the magnet 1e face left on the drawing 1
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and the magnetic flux from the magnet 1d to the magnet 1e The magnetic flux toward 1 g is
directed to the right on the drawing 1. The magnetic flux on the inner peripheral side of the
magnet 1c is directed to the right, and the magnetic flux on the outer peripheral side of the
magnet 1g is directed to the left.
[0034]
For example, the conductive circuit between the magnet 1c and the magnet 1d is a current in the
direction from the front to the back of FIG. 1 and the magnetic flux direction at the same position
is leftward. Therefore, when a direct current flows, the conductive circuit at this position Receive
an upward force according to Fleming's left-hand rule. The conductive circuit between the
magnet 1d and the magnet 1e is a current in the direction from the back to the front in FIG. 1
and the magnetic flux direction at the same position is rightward, so the conductive circuit at this
position also receives an upward force. Similarly, the conductive circuits in all positions described
in FIG. 1 receive a uniform upward force.
[0035]
Therefore, when an acoustic signal which is an alternating current is input, the entire conductive
circuit is driven in the same direction in the vertical direction, and as a result, the entire
diaphragm is driven in phase. The diaphragm driven in phase generates an acoustic signal of the
compressional wave of air and reproduces the sound.
[0036]
Detailed cross-sectional view of the flat speaker using the ring circuit (partial enlarged view in
FIG. 2) Conceptual cross-sectional view of the flat speaker using the ring circuit (overview)
Layout of the ring magnet installed on the yoke Both sides of the diaphragm Annular circuit set
to
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