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JPH0585197

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DESCRIPTION JPH0585197
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker, and more particularly, to a cone-shaped external diaphragm having an elliptical cross
section perpendicular to the axis and a dome affixed to the inner peripheral side of the external
diaphragm. The present invention relates to a speaker having a diaphragm composed of a mold
internal diaphragm, and a structure for alignment when the internal diaphragm is attached to an
external diaphragm.
[0002]
2. Description of the Related Art A speaker using a diaphragm comprising a cone-shaped external
diaphragm having an elliptical cross section in an axis-perpendicular section and a dome-shaped
internal diaphragm affixed to the inner peripheral side of the external diaphragm. In a typical
example, the inner peripheral edge portion of the external diaphragm is cylindrical, and a voice
coil is wound around this cylindrical portion and inserted into the magnetic gap. Then, the outer
peripheral edge portion of the internal diaphragm is attached to the upper end surface of this
cylindrical portion. By the way, in a speaker provided with a diaphragm including such an
external diaphragm and an internal diaphragm, in order to obtain desired frequency
characteristics, there are cases where it is desired to increase the diaphragm area of the internal
diaphragm. In such a case, it is necessary to attach the internal diaphragm at an intermediate
position between the inner peripheral edge and the outer peripheral edge of the external
diaphragm, but doing so causes the following problems.
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[0003]
That is, in the above conventional example, when the internal diaphragm is attached to the
external diaphragm, the outer peripheral edge of the internal diaphragm is circular, and the
upper end surface of the cylindrical portion is also circular. The diaphragm had no directionality
at the time of bonding, so it was sufficient to simply paste the internal diaphragm on the upper
end surface of the cylindrical portion without performing special alignment. However, when the
internal diaphragm is attached at the middle position of the external diaphragm, the attached
part of the external diaphragm has an elliptical shape, so that the attached parts have different
inclination angles in the circumferential direction. That is, the inclination angle on the long axis
side is the gentlest, the inclination angle on the short axis side is the steepest, and the inclination
angle gradually becomes gentler from the short axis side toward the long axis side. Therefore, the
attachment margin that constitutes the outer peripheral edge of the internal diaphragm is also
inclined in the circumferential direction in the same manner as the inclination angle of the
attached part of the external diaphragm, corresponding to the external diaphragm There is a
need. For this reason, the internal diaphragm has directionality at the time of adhesion, and in
the case of adhesion, alignment between the internal diaphragm and the external diaphragm is
required. Temporarily, if it is pasted ignoring directionality, a sticking gap will arise and it can
not acquire desired frequency characteristics on account of this. On the other hand, if the
bonding margin is increased, the weight of the entire diaphragm is increased, and the frequency
characteristics are degraded.
[0004]
Therefore, conventionally, when the internal diaphragm is attached to the external diaphragm,
the diaphragm is provided so that the alignment can be reliably performed and the displacement
of the attachment is prevented. A speaker is desired
[0005]
An object of the present invention is to provide a speaker capable of solving the above problems.
[0006]
SUMMARY OF THE INVENTION In order to achieve the above object, the feature of the present
invention is to provide a cone-shaped external diaphragm having an elliptical cross section
perpendicular to the axis and an inside of the external diaphragm. In a speaker provided with a
diaphragm comprising a dome-shaped internal diaphragm attached to the circumferential side, at
least two positioning convex portions in the circumferential direction are provided on either one
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of the external diaphragm and the internal diaphragm. A positioning concave portion is provided
which is provided on either the external diaphragm or the internal diaphragm, and the
positioning convex portion is fitted to each other, and each positioning convex portion is
provided on each other. The internal diaphragm is stuck to the external diaphragm in a state of
being fitted in the alignment recess.
[0007]
Also, the alignment recess may be a notch.
Also, the alignment recess may be a through hole.
[0008]
According to the present invention, according to the present invention, a diaphragm comprising a
cone-shaped external diaphragm having an elliptical cross-section in an axis perpendicular
direction and a dome-shaped internal diaphragm affixed to the inner peripheral side of the
external diaphragm. In the speaker provided with the present invention, positioning convexes are
provided in at least two places in the circumferential direction on any one of the external
diaphragm and the internal diaphragm.
A positioning recess in which each positioning protrusion is fitted is provided in either the
external diaphragm or the internal diaphragm.
When attaching the internal diaphragm to the external diaphragm at the time of assembling the
speaker, each positioning convex portion is fitted to each positioning concave to perform
positioning, and in such a state, the internal vibration is generated. Stick the board to the external
diaphragm.
[0009]
FIG. 1 is a longitudinal sectional view along the long axis of the first embodiment of the present
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invention, FIG. 2 is a plan view thereof, and FIG. 3 is a longitudinal sectional view along the short
axis thereof It is. The speaker 1 is a small so-called elliptical speaker. The speaker 1 comprises a
magnetic circuit 2 and a vibration system 3. The magnetic circuit 2 is a so-called internal
magnetic type magnetic circuit, and includes a center pole 6 forming a ring-shaped magnetic gap
5 between the bottomed cylindrical yoke 4 and the upper portion 4A of the yoke 4, and a lower
portion 4B of the yoke 4 It consists of a magnet 7 interposed between the center poles 6. The
magnetic circuit 2 is accommodated in a housing 8. The vibration system 3 includes a diaphragm
10 made of a transparent synthetic resin material with a very small thickness and a voice coil 11.
The diaphragm 10 comprises an external diaphragm 12 and an internal diaphragm 13 attached
to the inner peripheral side of the external diaphragm 12 and covering the center pole 6.
[0010]
FIG. 4 is a plan view of the external diaphragm, FIG. 5 is a cross-sectional view taken along the
line AA of FIG. 4 and FIG. 6 is a cross-sectional view taken along the line BB of FIG. 7 is a plan
view of the internal diaphragm, FIG. 8 is a cross-sectional view taken along line C-C in FIG. 7, and
FIG. 9 is a cross-sectional view taken along line D-D in FIG. Referring to FIGS. 4 to 6, the external
diaphragm 12 is a cone-shaped diaphragm having an elliptical cross section perpendicular to the
axis. Therefore, the inclination angle on the long axis side is the gentlest, the inclination angle on
the short axis side is the steepest, and the inclination angle is gradually gentle from the short axis
side toward the long axis side. The inner peripheral edge portion of the external diaphragm 12 is
cylindrical, and the voice coil 11 is wound around the cylindrical portion 12A and is inserted into
the magnetic gap 5 as shown in FIG. Further, a flange portion 12B is formed at the outer
peripheral edge portion of the external diaphragm 12. The outer surface 12C of the external
diaphragm 12 is provided with a pair of positioning projections 15 at predetermined height
positions to which the internal diaphragm 13 is attached, spaced in the circumferential direction.
Each positioning convex portion 15 is formed in a triangular shape in a plan view that tapers
inward in the radial direction of the external diaphragm 12. One alignment projection 15 and the
other alignment projection 15 are disposed at symmetrical positions with respect to the center
point of the external diaphragm 12 along the long axis direction.
[0011]
On the other hand, as shown in FIGS. 7 to 9, the internal diaphragm 13 comprises a dome-shaped
main body 13A and a bonding margin 13B adhered to the outer surface 12C of the external
diaphragm 12. The dome-shaped main body 13A also functions as a dust cap in addition to the
function as a diaphragm. As described above, since the external diaphragm 12 to be attached has
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an elliptical cross section perpendicular to the axis, the outer periphery of the attachment margin
13B is clearly shown in FIG. 7 corresponding to this. In addition, it is elliptical. Also, the bonding
margin 13B is inclined corresponding to the inclination angle of the outer surface 12C of the
external diaphragm 12. Therefore, the internal diaphragm 13 has directivity in the
circumferential direction. Therefore, when attaching the internal diaphragm 13 to the external
diaphragm 12, it is necessary to align the two, so that the attachment margin 13B corresponds to
the position of the pair of alignment convexes 15, A pair of notches 16 is formed to illustrate the
mating recess. Each notch 16 is formed in a triangular shape in plan view, as shown in FIG. 7,
corresponding to the positioning projection 15. One notch 16 and the other notch 16 are
respectively disposed at symmetrical positions with respect to the center point of the internal
diaphragm 13 along the major axis direction.
[0012]
At the time of assembly of the speaker 1 of the above construction, the internal diaphragm 13 is
attached to the external diaphragm 12 to constitute the diaphragm 10. Under the present
circumstances, as shown in FIG. 5, the said notch 16 of the internal diaphragm 13 is fitted by the
said convex part 15 of the external diaphragm 12, position alignment is made, and the sticking
margin 13B is externally vibrated in this state. It is stuck on the outer surface 12 C of the plate
12. The adhesive is bonded in advance to either the bonding margin 13B or the outer surface
12C of the external diaphragm 12. Thus, in the above embodiment in which the internal
diaphragm 13 is reliably adhered to the external diaphragm 12 in the axial direction and
circumferential direction without sticking displacement in the axial direction and circumferential
direction in the above embodiment, the positioning convex is Although the portion 15 and the
notch 16 are disposed at symmetrical positions along the long axis direction and with respect to
the center point of the external diaphragm 12 (the internal diaphragm 13), they are provided at
intervals along the circumferential direction. It is enough. Further, in the above embodiment,
although the positioning projections 15 and the notches 16 are provided at two places in the
circumferential direction, they may be provided at three or more places. In addition, since the
thickness of the internal diaphragm 13 is extremely small at one location, accurate alignment can
not be performed, but reliable alignment can be achieved if provided at two or more locations.
[0013]
FIG. 10 is a sectional view of an essential part of a second embodiment of the present invention.
In this embodiment, a spherical projection 20 as a positioning projection is formed instead of the
notch 16 in the bonding margin 13B, and the projection 15 is substituted on the outer surface
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12C of the external diaphragm 12. A through hole 21 is formed as a positioning recess in which
the projection 20 is fitted. Also with such a configuration, the alignment between the internal
diaphragm 13 and the external diaphragm 12 is performed. FIG. 11 is a cross-sectional view of
the main part of the third embodiment of the present invention. In this embodiment, a spherical
projection 22 as a positioning projection is formed instead of the notch 16 in the bonding margin
13B, and the projection 15 is substituted on the outer surface 12C of the external diaphragm 12.
An arc-shaped recess 23 is formed as a positioning recess in which the projection 22 is fitted.
Also with such a configuration, alignment between the internal diaphragm 13 and the external
diaphragm 12 can be performed.
[0014]
FIG. 12 is a sectional view of an essential part of a fourth embodiment of the present invention.
In this embodiment, an arc-shaped notch 25 as a positioning recess is formed in place of the
notch 16 in the bonding margin 13B, and in the outer surface 12C of the external diaphragm 12,
the protrusion 15 is replaced. A spherical convex portion 26 is formed as a positioning convex
portion in which the notch 25 is fitted. Also with such a configuration, alignment between the
internal diaphragm 13 and the external diaphragm 12 can be performed. The positioning convex
portion and the positioning concave portion are not limited to the shapes of the first to fourth
embodiments, and various shapes are possible. Further, either one of the positioning protrusion
and the positioning recess may be provided on the external diaphragm and the other may be
provided on the internal diaphragm.
[0015]
As described above in detail, according to the present invention, a cone-shaped external
diaphragm having an elliptical cross section perpendicular to the axis and a dome affixed to the
inner peripheral side of the external diaphragm. In a speaker provided with a diaphragm
comprising a mold internal diaphragm, when the internal diaphragm is attached to the external
diaphragm, the positioning convex part is fitted to the positioning concave, and the internal
diaphragm and the external diaphragm Alignment is made. Therefore, the internal diaphragm is
reliably adhered to the external diaphragm at a predetermined position without any
misalignment in the axial direction and the circumferential direction. Therefore, a speaker having
desired frequency characteristics can be realized.
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