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JPS5815398

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DESCRIPTION JPS5815398
[0001]
The present invention relates to a speaker diaphragm. The purpose is to provide a speaker
diaphragm which is easy to manufacture and easy to manufacture. In general, it is ideal that the
speaker diaphragm vibrates in a piston with the acoustic plane completely in the same phase in
the use frequency band. Conventionally, in order to approach this ideal state, materials such as
paper and light metal have been formed into a cone or dome shape to form a speaker diaphragm.
However, when these speaker diaphragms are used, a space is formed in front of or behind the
diaphragm itself, and there is a problem that air in this space induces resonance and disturbs the
frequency characteristic remarkably. In recent years, in order to eliminate the defects of these
diaphragms, a flat diaphragm having a sandwich structure in which surface materials are
attached to upper and lower surfaces of a core material having two or more cams shaped cells
has been put to practical use. The flat diaphragm is light in weight and high in rigidity, so piston
oscillation is possible up to high frequencies, and the radiation surface is flat. It is possible to
obtain a low-distortioned speaker with a balanced sound quality with less occurrence of
frequency distortion. However, since the above-mentioned flat diaphragm is made up of a
plurality of k core-shaped cells in which the core material is assembled, the structure of the core
material itself is complicated, and several tens of manufacturing processes and many types This
method requires the following components, and its production is troublesome, resulting in an
overall increase in cost. The present invention solves such conventional drawbacks, and one of
the present invention will be described below with reference to the drawings of the
embodiments. FIG. 1 shows an embodiment of the speaker diaphragm of the present invention, in
which 1 is a core and 2 is a surface material attached to the upper and lower surfaces of the core
1. The core material 1 has a plurality of ribs 3 radially and integrally formed, and the ribs 3 are
continuously arranged in an uneven shape in the circumferential direction. Further, each of the
plurality of radially provided ribs 3 is formed such that the height thereof sequentially decreases
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from the center toward the outer periphery, and one of the ribs 3 is formed of two square
element elements 4 and 6. It has a combined shape and is configured in a substantially triangular
pyramid shape. Here, when the core material 1 is to be formed, for example, a long aluminum foil
is alternately folded back and forth at equal intervals in the longitudinal direction so as to form a
cross-sectional zigzag shape, as described above; It can be easily formed by rotating and
stretching the other end in a state where one end of the zig-zag plate obtained in A flat
diaphragm can be obtained by bonding an aluminum foil as the surface material 2 to the upper
and lower surfaces of the core material 1 having the plurality of ribs 3 radially as described
above by using an adhesive.
In addition, aluminum foil of thickness 20 ?m 9 width 9.6 inch, length 94 saw is alternately
folded back at equal intervals of 6.2 inch to make a zig-zag plate, and this zig-zag plate is reduced
at one end and the other end is reduced. A 20 ?m thick aluminum foil is pasted or laminated on
the upper and lower surfaces of the rotationally expanded core material, and the outer diameter
19018. In the case of a planar diaphragm having an outer peripheral height of 4 g and a central
height of 5.211, the weight of the diaphragm itself was about 20% lighter than that of a
conventional planar diaphragm using a conventional nick and nick shape. Moreover, the height
ratio of the center to the outer periphery was 0.77. Then, this flat diaphragm was assembled as a
woofer speaker 26 (1), and the frequency characteristic (1 W / 1 m 2) was measured with a JIS
standard BOX. As a result, a characteristic as shown by curve a in FIG. 4 was obtained. In this
case, the second resonance frequency is about 26% higher than that in the case where the height
ratio of the center and the periphery is 1, and the high frequency limit frequency can be
improved accordingly. For comparison, 20 mm thick aluminum foil made of aluminum foil with a
thickness of 20 ?m; and 20 tm thick aluminum foil as a surface material on the upper and lower
surfaces of a conventional core material assembled with cam-shaped cells A plate was prepared,
assembled into a 26 crn Woonoe speaker, and the frequency characteristics were similarly
measured. The result is as shown by curve C in FIG. FIG. 2 shows another embodiment of the
speaker diaphragm according to the present invention. In FIG. 2, 11 is a core and 12 is a surface
material bonded to the upper and lower surfaces of the core 11. And, the core material 11 is one
in which a plurality of ribs 13 are integrally formed radially. The rib-shaped flat portion 14 is
provided between the ribs 13 and each of the plurality of ribs 13 is erected at right angles at
regular intervals, and the height thereof is sequentially lowered from the center toward the outer
periphery It is formed to be Here, when the core material 11 is to be formed, for example, as
shown in FIG. 3, a long aluminum foil 14 is bent along the solid line so as to be convex upward,
and further along the alternate long and short dash line to the lower side. After bending so as to
be convex, the area of the integrated chest ? surrounded by the dotted line symmetrical to the
solid line is bonded to each other with an adhesive to form a zigzag plate, and then one side 14a
of the above-mentioned zigzag plate ( It can be easily obtained by shrinking and consolidating
the long end of the joint surface, and rotating and stretching the other end 14b (short end of the
joint surface). Then, an aluminum foil as the surface material 12 is attached to the upper and
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lower surfaces of the core material 11 having the plurality of ribs 13 radially as described above
by using an adhesive, whereby a flat diaphragm can be obtained.
Note that aluminum foil with a thickness of 20 ?m 2, width 9 6 cm and length 1311 MI + is
alternately bent 90 cycles alternately at equal intervals of 7.51 B, and one side is 7.3 ML etc. The
top and bottom surfaces of a core material in which the short end of the joint surface is
rotationally expanded in a state where the ends are joined together in a trapezoidal shape (4)
with an end of 41 m and made into a zigzag plate The aluminum foil of 20 micrometers in
thickness is pasted together, the outer diameter of 190 m. In the case of a flat diaphragm having
a height of 4 m on the outer periphery and a height of 7.311 L at the center, the weight of the
diaphragm itself is about 10% lighter than that of a flat diaphragm using a conventional nickshaped core material. The The height ratio between the center and the periphery was 0.55. Then,
this flat diaphragm was assembled as a 26-woofer speaker, and the frequency characteristic (IW
/ 1 m,) was measured with a JIS standard BOX. As a result, the characteristic shown in the curve
of FIG. 4 was obtained. In this case, the second resonance frequency is 30% higher than that in
the case where the height ratio of the center to the outer periphery is 1, and the upper limit
frequency can be improved accordingly. In the speaker diaphragm of the present embodiment
described above, since the core material of the speaker diaphragm is one in which a plurality of
ribs are integrally formed radially, compared with the conventional core material in which a
plurality of cells with a humcam shape are gathered. Since the amount of adhesive is small, and
hence the weight of the diaphragm itself can be reduced, absorption of vibrational energy by the
adhesive is small, and driving efficiency can be significantly enhanced. In addition, since the
heights of the plurality of radially formed ribs are sequentially lowered from the center toward
the outer periphery, the height ratio between the outer periphery and the center is small, and the
ratio is second compared to one. The resonance frequency can be increased by increasing the
number, which can improve the upper limit frequency. In addition, since a flat plate having a
plurality of seven ribs integrally formed radially as a core material is used, the bending rigidity of
the diaphragm can be enhanced and the nodal circle at the resonance point of the diaphragm is
almost a perfect circle. In the so-called joint drive system in which the inside of one node is
driven by a voice coil, it is possible to make a plane diaphragm particularly effective. In addition,
since the first resonance frequency is slightly increased, the diameter of the nodal circle can be
reduced, and thus there is an advantage that the diameter of the voice coil in the case of the
nodal drive method can be reduced. In the above embodiment, the core material in which a
plurality of ribs are integrally formed radially bends a long metal thin film. It is produced by
rotating and stretching the other end in a state in which one end is reduced and condensed, but it
can also be created by press forming, vacuum forming or the like of a metal thin film.
As described above, according to the present invention, the core material is formed by integrally
forming a plurality of ribs radially. The shape of the core itself is simple and has the advantage of
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making it. In addition, since the heights of the plurality of ribs formed on the core material are
sequentially lowered from the center toward the outer periphery, the second resonance
frequency can be improved to increase the high frequency limit frequency, and the high
frequency is flat to high frequency. It has the advantage that sound pressure can be obtained.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cutaway perspective view of the main portion showing one embodiment of the speaker
diaphragm of the present invention, FIG. 2 is a main portion cutaway perspective of the other
embodiment, and FIG. 3 is a core material used for the same diaphragm. FIG. 4 is a sound
pressure frequency characteristic diagram of the speaker diaphragm of the present invention and
the prior art.
1.11 иииииии Heart material, 2, 12 иии и и и Surface material, 3 ░ 13 и и e и 11-lip. Name of agent
Attorney Nakao Toshio Other 1 person Figure 1 Figure 2 f
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