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JP2000041295

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2000041295
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for an elliptical or oval speaker elongated in the width direction.
[0002]
2. Description of the Related Art In order to save space in a speaker system of AV equipment in
recent years, a diaphragm for a speaker is desired which is an elongated speaker in the width
direction but has an enhanced ability to reproduce middle and high frequency ranges. There is.
[0003]
Therefore, in order to improve the reproduction ability of the middle and high tone range, one
disclosed in Japanese Utility Model Application Publication No. 2-4554 has been known.
The speaker diaphragm described in the same publication will be described below with reference
to the drawings.
[0004]
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1
FIG. 2 of the same publication is a plan view of a ribbed diaphragm of a circular speaker. In the
same figure, 1 is the whole diaphragm, 2 is a diaphragm main body, 3 is a plurality of reinforcing
ribs provided radially on the surface of the diaphragm main body 1. FIG. 4 is an enlarged crosssectional view of the reinforcing rib 3. The reinforcing rib 3 having a mountain-shaped cross
section is integrally molded with the diaphragm 1, and a flat reinforcing sheet 4 is bonded to the
opening.
[0005]
However, in the above configuration, the inside surrounded by the reinforcing rib 3 having a
mountain-shaped cross section and the flat reinforcing sheet 4 is hollow. Therefore, the
reinforcing rib 3 having a cross-sectional mountain shape is easily deformed at a mid-range
frequency in the vicinity of 500 to 2 kHz where the diaphragm 1 vibrates to generate peaks and
valleys while waving in the circumferential direction. In particular, in the case of the diaphragm
shape elongated in the width direction, the deformation of the reinforcing rib 3 appears notably,
and there is a problem that the diaphragm 1 can not be sufficiently reinforced.
[0006]
The present invention solves the above-mentioned problems, and it is for an elliptical or oval
speaker which can improve the reproduction characteristics of the middle to high range without
deformation of the reinforcing rib even if the diaphragm is elongated in the width direction. It
aims at providing a diaphragm.
[0007]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention provides an elliptical or oblong speaker diaphragm in which the length from the end of
the opening of the diaphragm to the end of the major diameter is It defines the passing point
height of the major axis direction cross-sectional shape at the position of 1/2 of.
With this configuration, the strength of the central portion of the diaphragm can be increased,
and the reproduction range of the high range can be expanded.
[0008]
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2
According to the present invention, in addition to the above structure, a plurality of reinforcing
ribs integrally formed in the major axis direction of the speaker diaphragm are provided, and
further, the speaker diaphragm is provided inside the reinforcing ribs. By filling the material, the
strength is increased, and with such a configuration, the deformation of the reinforcing rib is
eliminated, and the peak dip of the reproduction characteristic of the midrange can be made
flatter.
[0009]
Furthermore, according to the present invention, the internal loss of the diaphragm is increased
by adopting a configuration such as bonding reinforcement of the adhesive film of the edge of
the speaker diaphragm, and the peak dip of the reproduction characteristic in the middle range is
flattened. And the diaphragm shape can be simplified.
[0010]
DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0011]
Embodiment 1 FIG. 1A is a plan view of a speaker diaphragm according to the present
embodiment.
Reference numeral 1 denotes a diaphragm main body having a diameter of 20 mm and a
diameter of 180 mm and made of pulp, and an opening hole 2 having an inner diameter of 15
mm is open at the center of the diaphragm 1.
The opening 2 is for fitting a voice coil.
[0012]
FIG. 1 (b) is a sectional view taken along the line A-A1 of the diaphragm 1 of FIG. 1 (a), wherein
the total height of the diaphragm 1 is 12 mm, the distance b from the center of the diaphragm 1
= 25 mm and the vibration An arc C2 having a straight line C1 and a straight line C1 as tangents
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is joined at a position of distance c = 6 mm from the lower end portion of the plate 1.
At this time, the shape satisfies the conditions described below, and will be described with
reference to FIG.
[0013]
FIG. 2 (a) is a plan view of the speaker diaphragm according to the present embodiment, and the
configuration is completely the same as FIG. 1 (a). The length of the major axis is L1, and the
length of the minor axis is L2.
[0014]
FIG. 2 (b) is a cross-sectional view of the diaphragm 1 of FIG. 2 (a) taken along line A-A1 where
the total height is H and 1/1 / mm of the length from the end of the aperture 2 to the major
diameter end. Let 2 be L3 and let h be the height at the position of length L3. At this time, the
height h is H / 2 + H × (a0.05−1) ≦ h ≦ H × 5/6 (1) where a = L1 / L2 (aspect ratio of major
axis L1 and minor axis L2) Go through).
[0015]
This conditional expression is calculated based on the results of simulation calculation and
measurement of optimization for several types of loudspeaker diaphragms having different
aspect ratios.
[0016]
[Table 1]
[0017]
An example of the result calculated by the above equation (1) is shown below.
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4
In the case of the present embodiment, the range of h is calculated as 7.44 ≦ h ≦ 10 in the top
data of (Table 1).
[0018]
Needless to say, the present invention is not limited to the examples described above.
[0019]
FIG. 3 is a diagram showing the sound pressure frequency characteristics of the speaker
diaphragm in the present embodiment. In FIG. 3, A is a characteristic when the cross-sectional
shape in the major axis direction of the diaphragm is formed only by a straight line. And B
indicates the characteristics of this embodiment, that is, when the cross-sectional shape is
constituted by a straight line C1 and a circular arc C2.
As is clear from the figure, the sound pressure characteristic of the high frequency range of 5
kHz or more is improved from the characteristic (A) to the characteristic (B).
This is because the strength in the vicinity of the center of the diaphragm 1 is further increased
by setting the cross-sectional shape in the major axis direction of the diaphragm as described
above.
[0020]
Second Embodiment FIG. 4 is a plan view of a speaker diaphragm according to a second
embodiment of the present invention. The diaphragm 1 and the hole 2 opened at the center of
the diaphragm 1 are the same as those in the first embodiment. The difference is that the
diaphragm 1 is provided with a plurality of reinforcing ribs 3, and the reinforcing ribs 3 are
integrally formed with a length of 25 mm, a width of 3 mm, and a height of 2 mm in the major
axis direction of the speaker diaphragm. . The size of the reinforcing rib 3 is determined from the
vibration mode around 500 to 2 kHz of the diaphragm 1.
[0021]
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5
Furthermore, the inside of the reinforcing rib 3 is filled with a speaker diaphragm material, and
when the diaphragm 1 is molded, the reinforcing rib 3 is also molded at the same time. At this
time, since molding is performed by press processing and the reinforcing rib 3 has a larger
surface thickness than the other portions, the internal density of the reinforcing rib 3 is lower
than that of the other portions, and the overall weight of the diaphragm 1 is the reinforcing rib
There is not much increase even with 3 added. Further, as shown in FIG. 5, the cross-sectional
shape can be, for example, a triangular shape as shown in (a), an arc shape as shown in (b), or a
rectangular shape as shown in (c).
[0022]
Needless to say, the present invention is not limited to the examples described above.
[0023]
FIG. 6 is a diagram showing the sound pressure frequency characteristics of the speaker
diaphragm in the present embodiment, where A is the characteristic when the inside of the
reinforcing rib is hollow, B is the present embodiment, That is, the characteristics when the inside
of the reinforcing rib is filled with the diaphragm material are shown.
As is clear from the figure, it can be seen that the deformation of the reinforcing rib 3 disappears
in the middle band around 500 to 2 kHz, and the peak dip of the reproduction characteristic of
the middle band is flat. This is because the inside of the reinforcing rib 3 is filled with the speaker
diaphragm material, and therefore, the deformation of the reinforcing rib 3 disappears in the
middle range of around 500 to 2 kHz. Third Embodiment FIG. 7 is a plan view of a speaker
diaphragm according to the present embodiment. The diaphragm 1 and the hole 2 opened at the
center of the diaphragm 1 are substantially the same as the configuration in the second
embodiment. A different point is that the pasting part 4 a of the edge 4 is widely pasted to both
end faces in the major axis direction of the diaphragm 1. The bonding width is 30 mm, which is
determined from the vibration mode as in the second embodiment.
[0024]
Needless to say, the present invention is not limited to the examples described above.
[0025]
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As described above, according to the present embodiment, the pasting margin 4a is pasted so as
to cover the end face in the major axis direction of the diaphragm 1, so that the internal loss of
the pasted portion of the diaphragm 1, ie, the end face The peak dip of the reproduction
characteristic of the midrange can be flattened.
Further, since the reinforcing rib as in the second embodiment is not required for the diaphragm
1, the shape of the diaphragm 1 can be simplified.
[0026]
As described above, according to the present invention, according to the present invention, in the
elliptical or oblong speaker diaphragm, a half of the length from the open hole end to the major
diameter end of the diaphragm is used. By defining the passing point height of the cross-sectional
shape in the major axis direction at the position, the strength in the vicinity of the center of the
diaphragm can be further increased, and the reproduction band of the high range can be
expanded.
[0027]
Further, the speaker diaphragm is provided with a plurality of reinforcing ribs, the reinforcing
ribs are integrally formed in the longitudinal direction of the speaker diaphragm, and the inside
of the reinforcing ribs is filled with the speaker diaphragm material. Thereby, the deformation of
the reinforcing rib is eliminated, and the peak dip of the reproduction characteristic of the
midrange can be made flat.
[0028]
Further, since the bonding of the speaker diaphragm and the bonding portion of the edge is
made wide, the internal loss of the bonding portion of the diaphragm becomes large, and the
peak dip of the reproduction characteristic in the middle range is made flat, And the diaphragm
shape can be simplified.
[0029]
Brief description of the drawings
[0030]
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1 is a diagram showing a speaker diaphragm in the first embodiment of the present invention
[0031]
2 is a diagram showing the speaker diaphragm in the first embodiment of the present invention
[0032]
Fig. 3 is a diagram showing sound pressure frequency characteristics of the speaker diaphragm
in accordance with the first exemplary embodiment of the present invention.
[0033]
4 is a plan view of the speaker diaphragm according to the second embodiment of the present
invention.
[0034]
Fig. 5 A diagram showing the cross-sectional shape of the reinforcing rib of the speaker
diaphragm
[0035]
FIG. 6 is a diagram showing sound pressure frequency characteristics of the speaker diaphragm
in accordance with the second exemplary embodiment of the present invention.
[0036]
7 is a plan view of the speaker diaphragm according to the third embodiment of the present
invention.
[0037]
Explanation of sign
[0038]
DESCRIPTION OF SYMBOLS 1 diaphragm 2 opening hole 3 reinforcing rib 4 edge 4a pasted part
10 whole diaphragm 11 diaphragm main body 12 opening hole 13 reinforcing rib 14 reinforcing
sheet
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