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JP2000253488

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2000253488
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electro-acoustic transducer which is, for example, a fully driven flat speaker.
[0002]
2. Description of the Related Art FIG. 6 is a view for explaining a diaphragm 7 constituting an
electroacoustic transducer generally used, and FIG. 6 (A) is a front view thereof, FIG. 6 (B). Is a
longitudinal cross-sectional side view which cut the diaphragm of the figure (A) by the AA line. In
the electro-acoustic transducer according to the present invention, for example, a frame, a rear
plate, a magnet, a pole piece, etc., which are constituent members as a full drive flat speaker unit,
are omitted for convenience of explanation.
[0003]
Now, as shown in FIGS. 6A and 6B, the diaphragm 20 is composed of a plurality of crests 20a1 to
20a7, a flat portion 20b, and an outer periphery 20c in the longitudinal direction, and these
crests 20a1 to 20a7 The flat portion 20b and the outer peripheral portion 20c are integrally
molded. Further, the top portions 20a1 to 20a7 are formed in a curved surface convex shape
(ridge) from the back side (the rear plate side not shown) of the diaphragm 7 toward the front
side, and these top portions 20a1 to 20a7 serve as the main vibration portion 20A. It is integrally
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molded. The apexes 20a1 to 20a7 are arranged in parallel in the longitudinal direction of the
diaphragm 7 (in the vertical direction in FIG. 6A), and the sectional shapes of the apexes 20a1 to
20a7 are the same except for both ends, In FIG. 6 (B), it has a convex shape (wedge shape, semicylindrical shape) longitudinally cut along the line AA. An outer peripheral portion 20c is formed
around the main vibrating portion 20A. Although only seven crests 20a1 to 20a7 are shown in
the drawing, it is needless to say that the number can be increased or decreased as needed.
[0004]
Thus, by supplying an audio signal (drive current) between the pair of speaker terminals of the
not-shown full-surface drive type speaker unit configured as described above, each of the top
portions 20a1 to 20a7 of the diaphragm 20 is uniformed back and forth with respect to the
page. It will vibrate all over.
[0005]
By the way, for example, as shown in FIG. 7 with one wire rod, the voice coil 21 sequentially
approaches the circumference of the top portions 20a1 to 20a7 constituting the diaphragm 20
from left to right in the figure. Arranged by winding.
The number of turns of the voice coil 21 wound around the tops 20a1 to 20a7 is about 10 turns.
One end of the voice coil 21 is connected to the + terminal 23 of the pair of speaker terminals
provided on the rear plate (not shown), and the other end of the voice coil 21 is connected to theterminal 24. The voice coils 21 wound around the tops 20a1 to 20a7 are firmly fixed to the
bottoms of the tops 20a1 to 20a7 with an adhesive or the like. As a result, even if the top
portions 20a1 to 20a7 vibrate largely due to the current supplied to the voice coil 21, the voice
coil 21 does not peel off or drop off from the bottom of each of the top portions 20a1 to 20a7.
[0006]
Thus, by supplying a drive current for vibrating the diaphragm 20 between the speaker terminals
23 and 24 in the direction of the arrow in FIG. 7, each of the top portions 20a1 to 20a7 vibrates
back and forth uniformly with respect to the paper surface. As a result, the diaphragm 20
vibrates flatly on the entire surface.
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[0007]
Now, as described above, when the drive current is supplied to the boil coil 21 wound around
each of the tops 20a1 to 20a7 arranged in parallel on the diaphragm 20, each of the tops 20a1
to 20a7 is back and forth with respect to the page. In this case, as shown in FIG. 6, there is a
difference in the driving force between the end portions 20aa and 20ab of the top portions 20a1
to 20a7 and the center portion 20ac thereof (both ends Driving force near 20 aa, 20 ab> Driving
force near central portion 20 ac). That is, the tops 20a1 to 20a7 have different displacement
responses. As a result, in the flat speaker using the conventional drive coil wiring mode shown in
FIG. 7 described above, it was not possible to obtain smooth and preferable sound pressure
frequency characteristics in all frequency bands. Further, according to this method, since the
voice coil 21 is disposed by sequentially winding one wire along the groove of the formed
diaphragm 20, it takes time and at the same time, the voice coil 21 There have been difficulties in
winding the magnetic circuit to a predetermined position.
[0008]
Therefore, in order to eliminate the problems as described above, one configured as shown in
FIG. 8 has been proposed. That is, FIG. 8 is an explanatory view of a wiring mode of the voice coil
21 in the conventional electroacoustic transducer, and wound around the ridge-shaped top
portions 20a1 to 20a7 provided in parallel on the diaphragm 20 described above. The voice coil
21 to be disposed is provided at every other one of the plurality of juxtaposed peak portions
20a1 to 20a7 and between the crests 20a1, 20a3, 20a5 and 20a7 (or the crests 20a2, 20a4 and
20a6) The voice coil portions 21a to 21g are individually wound and disposed in the grooves. As
a result, even if drive currents are supplied to the voice coil units 21a to 21g and the respective
tops 20a1 to 20a7 vibrate at the same time with respect to the drawing, the tops 20a2, 20a4,
20a6 (or the tops 20a1, 20a3, Since no drive current is supplied to 20a5 and 20a7), as in the
prior art, different displacement responses do not occur in the top portions 20a1 to 20a7. Thus,
an electro-acoustic transducer capable of obtaining flat sound pressure in all frequency bands by
integrally vibrating the top portions 20a1 to 20a7 as the main vibration portion 20A has already
been filed as Japanese Patent Application No. 9-284530. It is done.
[0009]
However, in such a conventional configuration, the voice coil portions 21a to 21g are individually
formed, and the coils are sequentially inserted into grooves (not shown) and then vibrated. Since
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the solder connection on the board is adopted, the strength of the soldered connection is
increased, which adversely affects the material characteristics of the diaphragm around it,
resulting in the failure of the balance as a whole of the speaker. It was giving. Further, since
many contacts are present electrically, there are problems in terms of performance stability, load
of contact resistance, and the like. In addition, defects such as soldering defects also occur in the
manufacture, and the solution has been awaited.
[0010]
SUMMARY OF THE INVENTION The present invention has been made in view of the above
problems, and is to obtain a flat sound pressure in all frequency bands by integrally vibrating a
flat diaphragm without division vibration. An electroacoustic transducer for driving the entire
surface of a flat plate-like diaphragm 20 provided with a plurality of projections 20a1 to 20a7 in
parallel in the longitudinal direction so as to be able to The present invention provides an
electroacoustic transducer using, as the voice coil 1 to be disposed, one that is integrally wound
in advance and then separated into a necessary number of individuals.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION An electroacoustic transducer according to
the present invention will be described below with reference to the drawings.
1 is a front view of the voice coil 1 used in the electroacoustic transducer according to the
present invention, FIG. 2 is a front view showing a first separated state in FIG. 1, and FIG. 3 is a
second separated in FIG. 4 is a front view showing a third separated state in FIG. 1, and FIG. 5 is a
front view showing a fourth separated state in FIG. The same parts as in the prior art are denoted
by the same reference numerals, and the detailed description thereof is omitted.
[0012]
The voice coil 1 in FIG. 1 is displayed only as a single body in the drawing, but this is integrally
integrated in advance as a five-layer structure in a thickness direction (direction orthogonal to
the paper surface), for example, by a single wire. It is wound and can be used separately as
needed. 2 is, for example, a + connection terminal, 3 is a voice coil portion wound so as to be
disposed in a groove (not shown) between the plurality of juxtaposed projections 20a1 to 20a7,
4 is, for example,-connection It is a terminal. P is a pitch set in advance so that the distance
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between the connection terminals 2 and 4 becomes constant.
[0013]
FIG. 2 shows a first example in which the number of individuals required is separated and used
from the state of FIG. Reference numeral 5 denotes a connection portion for connecting between
the voice coil portions 3 and 6. When winding the voice coil portions 3 and 6, this is an accurate
winding by setting connection points 51 and 61 in advance. Since the number of times can be
secured and there is no contact point, one side of the diaphragm is not reinforced as in the prior
art, and therefore, accurate axial vibration can be realized. In addition, since the pitch is set so
that the connection terminals are constant as described above, when forming the voice coil
portions 3 and 6, they are also formed at precise intervals during this time, and it is easy to make
a bowl.
[0014]
FIG. 3 shows a second example in which the necessary number of individuals are separated and
used from the state of FIG. 1, 7 is a connection portion, and 8 is a voice coil portion. Reference
numerals 71 and 81 denote connection points similar to those described above. As described
above, the voice coil unit is used by being separated into the required number of individuals as
needed from the state of FIG. According to the second example, the same effect as the first
example can be obtained.
[0015]
FIG. 4 shows a third example in which the necessary number of individuals are separated and
used from the state of FIG. 1, 9 is a connecting portion, and 10 is a voice coil portion. Reference
numerals 91 and 101 denote connection points similar to those described above. The voice coil
unit is used by being separated into the required number of individuals as needed as described
above. According to the third example, the same effect as the first example can be obtained.
[0016]
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FIG. 5 shows a fourth example in which a necessary number of individuals are separated and
used from the state of FIG. 1, 11 is a connecting portion, and 12 is a voice coil portion. Reference
numerals 111 and 121 are connection points similar to those described above. The voice coil
unit is used by being separated into the required number of individuals as needed as described
above. According to the fourth example, the same effect as that of the first example can be
obtained.
[0017]
As described above in detail, the present invention is an electroacoustic transducer for driving
the entire surface of a flat diaphragm in which a plurality of projections are provided in parallel
in the longitudinal direction, which is characterized in that As a voice coil disposed around the
protrusion, by using a coil integrally wound in advance and then separated into a necessary
number of individuals, it is possible to integrally vibrate the flat diaphragm without divided
vibration. Therefore, it is possible to provide an electroacoustic transducer capable of obtaining
flat sound pressure in the entire frequency band.
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