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JPS60223298

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DESCRIPTION JPS60223298
[0001]
TECHNICAL FIELD The present invention relates to a flat speaker diaphragm. The configuration
of the prior art and its problems Conventionally, the diaphragm for the speaker has a cone shape.
This is because the cone shape is structurally very strong in the vibration direction, and a wide
regeneration zone can be obtained even using a relatively low elastic material such as paper or
plastics. However, a speaker with a large concavity such as a cone has a peak dip on the sound
pressure frequency characteristic depending on its degree, which has disturbed the flatness of
the sound pressure frequency characteristic. In order to solve these problems, in recent years, a
flat diaphragm using a honeycomb sand-inch structure or the like has been studied and put into
practical use. However, in order to secure the necessary reproduction frequency band, the flat
diaphragm requires complicated manufacturing processes such as / X nick structure, and there
are still many types of components, adhesives, etc., and weight increase and cost increase can be
avoided. There is no present condition. Therefore, there has been a demand for a flat speaker
diaphragm having the same characteristics as conventional flat speakers at low cost. SUMMARY
OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides a
diaphragm for a flat speaker having an easy structure and flat sound pressure frequency
characteristics without using a complex flat diaphragm such as a sandwich structure. is there.
Configuration of the Invention The present invention is a cone having a flat portion
perpendicular to the axial direction in the outer peripheral portion, and the line connecting the
middle portion of the cone and the outer peripheral end of the flat portion is a valley line V A
first swing plate having a groove and an inverse triangular pyramid are continuously and radially
arranged, and each inverse triangular pyramid is fitted and bonded to each V groove of the first
diaphragm, and in the middle of the V groove An acoustic disc comprising a second diaphragm
configured to form a circumferential reinforcing wall, and an integral disc bonded to the flat
portion of the first diaphragm and the inverted triangular pyramid of the second diaphragm, The
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radiation surface is a plane. The flat speaker diaphragm configured as described above has a very
simple structure and has a unique effect that sound pressure frequency characteristics equivalent
to those of the conventional flat speaker can be obtained. Description of the Embodiments An
embodiment of the present invention will be described with reference to the drawings. FIG. 1
shows the shape of the first diaphragm of the flat speaker diaphragm in one embodiment of the
present invention, and FIG. 1 (a) is a perspective view of the first diaphragm, FIG. 1 is a crosssectional view taken along the line AA 'of FIG. In FIG. 1, 1 is a first diaphragm 1b. The surface
including 1c and 1d has a straight cone shape, and the flat portion 1e provided at the outermost
periphery of the first diaphragm 1 is perpendicular to the vibration direction (axial direction),
and the outer periphery is still present. 1a, IC all around.
It has a V groove 1f formed by 1b and 1c '. FIG. 2 shows a second diaphragm in this embodiment,
and FIG. 2 (a) is a perspective view thereof, and FIG. 2 (b) is a sectional view taken along the line
B-B 'of FIG. 2 (a). It is. In FIG. 2, 2 is a second diaphragm, 2a. A triangle formed by 28 'and 2b is
to be fitted in the V groove 1f of the first diaphragm 1 shown in FIG. 1, and has a substantially
inverted triangular pyramid shape connected to the center, A reinforcing wall 2c (vertical line
portion) in the circumferential direction is formed in the middle of 1f. In this embodiment, the
central side of the inverted triangular pyramid has a pendulum-like dome shape that does not
affect the sound pressure frequency characteristics with the inner diameter portion 2d having
the same diameter as the voice coil bobbin without extending to the center. This separates the
reverse dome portion 2e so that it can be bonded last, thereby enabling the use of a gauge for
setting the voice coil bobbin in the correct position from the upper surface of the diaphragm and
reducing the percentage of manufacturing defects. belongs to. Generally, in order to expand the
reproduction zone of the flat diaphragm, it is found that the bending strength in the radial
direction is large. For this reason, in the present embodiment, the curvature of the joint point
between the first diaphragm and the second diaphragm and the tooth driving point is such that
ribs are radially formed so as to maximize strength. However, in order to maximize the effect of
the radial ribs, it is necessary to reinforce them in the circumferential direction and fix the
respective ribs. In the present embodiment, therefore, the triangular reinforcing wall 2C formed
by 2a, 2b and 2a 'in FIG. 2 is formed by the n groove 1f of the first diaphragm and the inverted
triangular pyramid of the second diaphragm. The radial ribs are circumferentially fixed to form
an ideal reinforcing structure. The flat portion 2f provided on the outer periphery of the second
diaphragm 2 in FIG. 2 is bonded to the flat portion 1e provided on the outermost periphery of
the first diaphragm 1, and reinforces the outer side from the drive point It has a structure. FIG. 3
shows the entire configuration of this embodiment, and FIG. 3 (a) is a perspective view of the flat
speaker diaphragm of this embodiment, and FIG. 3) is the same sectional view. As described
above, the first and second diaphragms are adhered to each other, and further, the front panel 3
shown in FIG. 3 is adhered to the entire surface except the central inverted dome portion 2e. The
cone inner peripheral portion 1d of the first diaphragm 1 is bonded to the voice coil bobbin 4
and driven by a magnetic circuit. By configuring as in 5, the acoustic radiation surface becomes a
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perfect plane except for the central inverted dome portion 2e, and a flat sound pressure
frequency characteristic can be obtained.
In addition, the 1st which comprises a diaphragm. The second diaphragm 1.degree. 2 and the
surface plate 3 can be easily manufactured by thermoforming of a plastic film, paper-making of
pulp, etc., so they have a light-weighted diaphragm obtained at low cost. . As described above,
according to the present invention, the combination of the plurality of diaphragms is combined to
obtain a planar acoustic radiation surface and to reinforce the joint between the first and second
diaphragms in the radial and circumferential directions. Thus, it is possible to provide a
diaphragm for realizing a speaker having a flat sound pressure frequency characteristic and a
wide reproduction band. In addition, it is possible to provide a low-cost, high-efficiency flat
speaker which is simple in manufacturing method and reduced in weight as compared with the
conventional example.
[0002]
Brief description of the drawings
[0003]
FIG. 1 (a) is a perspective view showing a first diaphragm of the flat speaker diaphragm
according to an embodiment of the present invention, and FIG. 1 (b) is a sectional view taken
along line AA 'of FIG. 1 (a). Figure 2, Figure 2 (,) is a perspective view showing the same second
diaphragm, in Figure 2) is a cross-sectional view taken along the line BB 'of Figure 2 (,), Figure 3
(,) is the same plane FIG. 3 (b) is a cross-sectional view of the speaker diaphragm.
1 · · · 1st diaphragm, 1e · · · · · · · · · · · · · · · · · · 2 · · · · · · 2c · · · 2c · Reinforcing wall, 3 · · · · · · · ·
Surface plate. Name of Agent Attorney Nakao Toshio Other 1 person Figure 1 Figure 2
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