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DESCRIPTION JP2000059885

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DESCRIPTION JP2000059885
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
structure of a planar multipoint drive type speaker. We have already proposed a planar multipoint drive type speaker, and a plurality of repulsive magnetic circuits RM and voice coils C are
straight at predetermined intervals on the center line of the diaphragm 1 which is substantially
flat and manufactured in a slender shape. Japanese Patent Application No. 9-147036, Japanese
Patent Application No. 9-14037, Japanese Patent Application No. 9-14038, etc. have proposed
multi-point drive type loudspeakers having a long and narrow shape, which are mounted on each
other. An object of the present invention is to improve and develop a flat multi-point drive type
speaker using the repulsion magnetic circuit RM and to improve performance, as well as to
expand the range of use and to improve usability.
[0002]
2. Description of the Related Art The structure of a conventional thin and elongated multi-point
drive type speaker is as follows. The voice coil C is straight at a predetermined interval on the
center line of the diaphragm 1 fabricated substantially flat and elongated. And the voice coil C is
driven by the repelling magnetic circuit RM.
[0003]
The outline of the speaker will be described with reference to FIGS. 14 and 15. FIG.
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Magnets RM1 and RM2 used in the repulsive magnetic circuit RM have a ring shape with an
outer diameter of 15 mm, an inner diameter of 5.1 mm, and a thickness of 6 mm, and are
neodymium magnets with a maximum energy product of 35 Me. The center plate RM3 held by
(N pole) is an iron ring with an outer diameter of 15.83 mm, an inner diameter of 5.1 mm, and a
thickness of 2 mm, and is galvanized in the same manner as a conventional general magnetic
circuit component.
[0004]
Edge 2 is prepared by impregnating a cotton fabric having a weight of 100 g / m 2 to 110 g / m
2 with a resin solution having a phenol concentration of 24%, and further coating a mixed
solution of synthetic rubbers such as NBR and SBR. After air drying, this rubber-coated cotton
fabric is hot-pressed and molded into a predetermined roll shape, and after molding, unnecessary
portions such as the inner portion and the outer portion are cut away.
[0005]
The method of attaching the edge 2 to the diaphragm 1 is a method in which an adhesive is
applied to the edge affixing portion of the diaphragm and the affixing portion of both the edge 2
and the diaphragm 1 is bonded by heat pressing. The dimensions of plate 1 are 29.4 mm in
width, 183.4 mm in length, 3 mm in thickness (depth), and are generally flat with end portions of
long sides connected by an arc having a radius of 14.7 mm. Track viewed from the front It has a
shape.
[0006]
The material of the diaphragm 1 is mainly pulp, and as shown in FIG. 14, a hole for voice coil
attachment is provided on the center line of the diaphragm 1, the diameter of the hole is 17 mm
and the position is the diaphragm A total of three places are provided at one center and two at a
predetermined position distributed to the center from this hole, and the pasting margin for
attaching the edge is provided on the outer peripheral part on the back side of the diaphragm 1.
[0007]
A voice coil C is mounted in the hole for voice coil mounting on the diaphragm 1 with an edge,
and the winding start and end ends of each voice coil wire are wound on the diaphragm 1, And, it
is led to a predetermined position of the flat knitting tinsel wire attached to the edge affixing
portion of the diaphragm 1, and the respective end portions are soldered to perform parallel
connection wiring.
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[0008]
The voice coil C and the diaphragm 1 are attached by adhesion, and an adhesive reservoir 13
consisting of an inclined surface of about 45 degrees is provided outward around the voice coil C
attachment hole. By applying an adhesive to each adhesive reservoir 13 and curing the adhesive
to reach the required strength, the voice coil C and the diaphragm 1 are adhesively bonded, and
the diaphragm 1 with a voice coil is obtained. .
The bonding margin portion provided on the edge outer side of the diaphragm 1 is bonded to the
frame 3 as shown in FIG. 14 and FIG.
[0009]
The frame 3 is made of glass resin-filled ABS resin and its external dimensions are 228 mm long,
49.6 mm wide, and 15 mm deep (depth), and the bottom of the frame 3 is the center of the frame
3 and the length direction from this center The pole parts 3P of 5 mm in diameter and 14 mm in
height are integrally provided at a total of three locations divided into 60 mm, and the input
terminal lugs are attached to one flange part 3F for frame attachment provided on the short side
of the frame 3. There are two holes.
[0010]
In this hole, a square hole having a side of 2.5 mm penetrates from the surface to the back
surface of the flange portion 3F, and on the surface side, a counterbore portion having a
diameter of 8 mm and a depth of 1 mm is provided concentrically with the square hole. The pitch
dimension of the holes is the same as the pitch dimension (26 mm) of the flat braided tinsel wires
Wa and Wb attached to the edge 2, and a 0.5 mm thick brass is pressed in the holes to form
nickel. The plated faston terminal lugs are attached by caulking, and one is a plus side lug 4a and
the other is a minus side lug 4b.
[0011]
As shown in FIGS. 14 and 15, the flat knitting tin wire end portions Wa and Wb and a part of the
input terminal lugs 4a and 4b are connected by soldering, and the center of the voice coil C on
the inner peripheral side is further connected. A thin, elongated shape in which three repulsion
magnetic circuits RM are attached by screws b to the pole parts 3P of the frame 3 arranged in
one part, and one diaphragm 1 is driven by three voice coils C by the magnetic circuits RM. A
multipoint driven speaker structure is formed.
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[0012]
[0012] Such a thin, elongated multi-point drive type speaker has a limited shape installation
location provided at both ends of a thin plasma display panel television etc., for example, a
narrow elongated thin elongated shape and a depth However, even if it is premised that the
installation space is narrow, it is a speaker that can be arranged in such a space and yet exhibits
its functions sufficiently.
[0013]
When considering applying this thin and elongated speaker to a vehicle-mounted speaker, the
interior of the vehicle is an extremely limited space, so the speaker and the like should be
installed originally. Although the space for installing the speaker is small, and the speaker
installation point has a much more complicated shape compared to that of the home audio, such
thin and elongated speakers have an installation point everywhere. I can find it.
However, the installation itself may be limited in the case of a simple linear multi-point drive type
speaker at present.
[0014]
For example, when it is desired to install at a corner portion in a vehicle compartment or in the
vicinity of the corner portion, it is not suitable to install a linear shape itself, and it can not be
installed at such a location. The
[0015]
Therefore, the present invention takes advantage of the thinness and lightness of the
conventional thin and elongated speaker and solves the drawbacks of the linear shape as
described above, and installs a more complicated shape. It is an object of the present invention to
provide a speaker structure that can be installed at a location, particularly at a corner portion in
a vehicle cabin, or in the vicinity of the corner portion.
[0016]
SUMMARY OF THE INVENTION In the speaker structure according to the present invention, the
same poles of two axially magnetized magnets (RM1) (RM2) are disposed facing each other, and
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facing each other. The plate (RM3) made of soft magnetic material is sandwiched between the
plates, and the plate of the repulsive magnetic circuit which induces a repulsive magnetism in the
outer peripheral direction of the plate (RM3) to generate a constant magnetic flux in the outer
part of the plate (RM3) A substantially planar diaphragm (1) is attached to the outer peripheral
portion of the voice coil (C) disposed on the outer peripheral portion of the RM 3) with a fixed
clearance, and the diaphragm (1) has a plurality of repulsive magnetic magnets. In the structure
of the planar multipoint drive type speaker driven by the circuit (RM) and the voice coil (C), the
diaphragm has an elongated shape such that the bent portion has one or more places when
viewed from the front. is there.
[0017]
Further, the length of each side of the diaphragm adjacent to the bent portion is set to a desired
different length.
[0018]
Further, at least one of the sides of the diaphragm adjacent to the bent portion is configured to
form an arc-like curved shape when viewed from the front.
[0019]
Further, the width of any one of the diaphragms adjacent to the bent portion is set to a width
which is different from the width of the other portion on the entire side or locally.
[0020]
EXAMPLES The speaker of the present invention will be described with reference to FIGS. 1 to
13. The symbols of common parts are the same as in the prior art.
Two conventional linear diaphragms 1 are prepared, and the center of the hole 12 for voice coil
attachment provided at the center of the diaphragm 1 is traversed as shown in FIG. 1, and the
center line of the diaphragm 1 is provided. The diaphragms are cut at an angle of 30 degrees
with respect to each other, and the respective cut diaphragms 1A and 1B are joined together with
an adhesive as shown in FIG. The 1-shaped diaphragm 1C was produced.
[0021]
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A voice coil C of the same specification as that used for the thin, elongated multi-point drive type
speaker is used in the "L" shaped diaphragm 1C, and the voice coil mounting hole 12 of the
diaphragm 1C. I wore it.
Furthermore, although not shown, the ends of the winding ends and the winding ends of the
voice coil wires are wound on the diaphragm 1C and the flat knitting tinsel wire W attached to
the bonding margin of the diaphragm 1C. It leads to a predetermined position, and solders each
end and parallel-connects the wiring.
Also, as in the prior art, by bonding the outer peripheral portion of the voice coil C and the inner
diameter portion of the voice coil C mounting hole 12 of the "-" shaped diaphragm 1C by
bonding, the edge 2 and wired voice A "C" shaped diaphragm 1C with coil C was obtained.
[0022]
Further, as shown in FIG. 3, the frame 3 is also provided with a pole portion 3P for fixing a
magnetic circuit provided at the center of the frame 3 using two conventional linear frames 3 in
the same manner as the diaphragm 1C. Each frame 3A, 3B cut at an angle of 30 degrees to the
center and joined together with an adhesive was used to produce a "<" shaped frame 3C refracted
at 60 degrees as viewed from the front.
[0023]
The diaphragm 1C with the voice coil C is attached to the frame 3C by adhesion. The attachment
method is the same as that of the conventional thin and elongated multipoint drive type speaker,
and the rubber system shown in FIG. An adhesive h was applied, and the pole portions 3P of the
V-shaped frame 3C and the inner diameter portions of the voice coil C were adhered so as to
maintain concentricity.
[0024]
Further, as shown in FIG. 5, three sets of repulsion magnetic circuits RM similar to those used for
the thin and elongated multipoint drive type loudspeaker according to the prior art are provided
in the pole portion 3P of the frame 3 with screws b. Attached, a modified multi-point drive type
speaker was produced, in which one magnetic disk RM and one voice coil C drive a single “く”
shaped diaphragm 1C.
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[0025]
In the case of this embodiment, since the diaphragm 1 and the frame 3 are cut and manufactured
as described above, the edge 2 of the bent portion and the tip of the diaphragm 1C are pointed at
a predetermined angle. As a matter of course, the corner portions may be arc-shaped as shown in
FIG. 6, the bending angle is not limited, and the shape of the diaphragm 1 can be designed almost
freely.
For example, it is possible to bend at 90 degrees, as shown in FIG. 7, to make the whole
diaphragm 1 in an arc shape, or to provide a bent portion connected as shown in FIG. 11, or a
combination of an arc and a straight line, etc. It is.
[0026]
Here, when the directivity characteristics of the "-" shaped speaker of this embodiment were
measured, it was found that it had a function different from that of the conventional speaker.
12 and the characteristic table of FIG. 13, the solid line is perpendicular to the speaker
diaphragm (position of A in FIG. 12), the broken line is 30 degrees right (position of B in FIG. 12),
dashed dotted line There is a difference in the frequency characteristics of the right 30 degrees
and the left 30 degrees in the reproduction frequency characteristics, where L is 30 degrees
(position C in FIG. 12).
The microphone was installed at a distance of 1 meter and mounted on a speaker cabinet having
an inner dimension of 474 mm wide, 114 mm high and 34 mm deep.
[0027]
A conventional general speaker, that is, a speaker having a circular, elliptical or elongated
diaphragm shape as viewed from the front, etc. has a diaphragm shape which is symmetrical in
the left-right direction, so It is a matter of course that there is no difference in directivity between
the right side and the left side.
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However, in the “く” shaped speaker of this embodiment, the measured value at the
measurement point B shows a sound pressure level higher than the measurement point C at
3000 Hz or more, particularly 5000 Hz or more, It is recognized that the directivity in the inward
direction is wide.
[0028]
In other words, the speaker of the present invention can be interpreted as the sound being
emitted toward the inside (the direction B of FIG. 12) of the "く" character, and the sound field is
applied to any space utilizing this characteristic performance. It is possible to obtain
For example, when the speaker is attached to a corner of a ceiling of a vehicle cabin, it is possible
to obtain a sound field near the center of the vehicle cabin, that is, near the ears of a passenger
(listener).
In particular, the ability to form a sound field in the inward direction of the “く” character is an
extremely advantageous shape in terms of taking advantage of the space factor in an on-vehicle
speaker, and it is easy to make a sound field that was not outstanding in conventional speakers. It
is an advantage that makes it possible to
[0029]
Further, when two thin, elongated multi-point drive type speakers previously proposed and
mounted on a baffle in the shape of "く" were used to measure the directivity characteristics, it
was found that The measured values were similar, and in order to know the change in directivity,
the bending of the "く" was changed, and thin and elongated speakers with diaphragms of
different lengths were attached and measured. It showed distinctive directional characteristics.
[0030]
That is, as adjustment means for forming a desired sound field in a limited space, as shown in
FIGS. 8 to 10, vibration corresponding to each side generated by bending of the speaker as
shown in FIGS. An adjustment method is possible by changing the length of the plate or the
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shape of the diaphragm that hits the side.
In addition, there are various methods of changing the shape, such as making the whole of the
diaphragm forming the side a curved shape or changing the width of the diaphragm.
Therefore, there is an advantage that the sound field can be formed by a very free design
method.
[0031]
The speaker structure according to the present invention is of course applicable not only to invehicle speakers but also to speakers in other fields such as home audio.
[0032]
According to the speaker structure of the present invention, it becomes possible to obtain a
speaker conforming to a curved shape such as a corner portion in the vehicle compartment or in
the vicinity of the corner portion, a bent shape, etc. There is an effect that the installation fitting
point is much more than the speaker of the present invention or the linear shaped speaker
proposed by us last time.
[0033]
Brief description of the drawings
[0034]
1 is a front view showing a state in which two conventional linear diaphragms are cut in the
process of obtaining the “」 ”shaped diaphragm of the present invention.
[0035]
2 is a front view showing a state in which the "」 "shaped diaphragm of the present invention is
completed.
[0036]
3 is a front view showing a state in which the "「 "shaped frame of the present invention is
completed.
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[0037]
4 is a perspective view showing a state immediately before mounting the "-" shaped diaphragm in
the present invention to the "-" shaped frame.
[0038]
5 is a perspective view showing a completed state of the "く" shaped modified multi-point drive
type speaker according to the present invention.
[0039]
6 is a front view showing another embodiment of the '-' shaped multi-point drive speaker
according to the present invention.
[0040]
FIG. 7 is a front view showing another embodiment of the '-' shaped multi-point drive speaker
according to the present invention.
[0041]
FIG. 8 is a front view showing another embodiment of the '-' shaped multi-point drive speaker
according to the present invention.
[0042]
FIG. 9 is a front view showing another embodiment of the '-' shaped multi-point drive speaker
according to the present invention.
[0043]
FIG. 10 is a front view showing another embodiment of the '-' shaped multi-point drive speaker
according to the present invention.
[0044]
FIG. 11 is a front view showing another example of the “く” shaped multipoint drive type
speaker according to the present invention.
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[0045]
12 is a perspective view showing the measurement position of the "く" shaped multi-point drive
type loudspeaker according to the present invention.
[0046]
FIG. 13 is a frequency characteristic diagram of the “く” shaped multipoint drive type
loudspeaker according to the present invention.
[0047]
FIG. 14 is a front view and a sectional view showing a thin and elongated multi-point drive type
speaker according to the prior art.
[0048]
FIG. 15 is a perspective view showing a thin and elongated multi-point drive type speaker
according to the prior art.
[0049]
Explanation of sign
[0050]
1 diaphragm 2 edge 3 frame C voice coil RM repulsive magnetic circuit RM1 magnet RM2
magnet RM3 center plate
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