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JPH02146899

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DESCRIPTION JPH02146899
[0001]
<Industrial Field of Application> The present invention relates mainly to the structure of a
vibrating member of a loudspeaker having a dome-shaped diaphragm. <Prior Art> A speaker
having a dome-shaped diaphragm of this type conventionally includes a horn-type speaker that
applies an acoustic load to a diaphragm (1) that radiates sound by so-called horns, or a horn of
some or all of the diaphragms. There are air-loaded speakers (soft dome shape) and the like that
do not apply a load. Then, the diaphragm (1) has a hemispherical dome shape at its central
portion, and an edge portion (2) (most of which is corrugated) that holds vibration compliance is
bonded or integrally molded on its outer periphery The outer periphery of (2) is held by the
holding portion that holds down the pressure. Furthermore, the voice current is applied to the
relative portion to the pole face of the cylindrical voice coil bobbin (3), which is inserted into and
suspended in the annular magnetic gap of the magnetic circuit and one end is adhered to the
dome-shaped outer periphery of the diaphragm. It is wound with an electric wire to flow. When a
voice current is externally applied to the electric wire, the magnetic field generated by the voice
current flowing through the voice coil and the magnetic field in the magnetic gap generate an
electromagnetic induction action to vibrate the voice coil in the axial direction. The vibration is
transmitted to the diaphragm through the outer periphery of the diaphragm, and the diaphragm
vibrates the air around the diaphragm to generate a sound. In terms of structure, many
diaphragms and edge parts are integrally molded (conventional phenol range resin impregnated),
or in the case of metal plates such as titanium diaphragms, using a press machine. In many cases,
the diaphragm and the edge portion are integrally formed. Therefore, although the voice coil is
concentric (axial) with the diaphragm or the edge portion, it has a three-dimensional relative
positional relationship, so as shown in FIG. J) coil! A structure is generally adopted in which the
adhesive fixed to the diaphragm (11) is concentrically bonded to the vibrating plate (11) by
means of the adhesive margin (14) formed on the voice coil bobbin (13). <Problems to be Solved
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by the Invention> Therefore, in order to vibrate while maintaining the amplitude without
touching the domain wall in the above-described structurally narrow magnetic gap, dimensional
accuracy of the order of 0.0111 is required. However, it is very difficult for the outer peripheral
portion of the dome-shaped diaphragm (11) to have a center (the center line is aligned), and
when bonding the tip of the voice coil bobbin (13) thereon, the voice coil bobbin (13 Because the
outer shape of) is distorted, the bonded part is difficult to fix, and the axis is easy to tilt, the
diaphragm (11) is difficult to adhere concentrically and vertically to the bobbin (13), and the
defect rate in the manufacturing process It is the highest process.
Also, gold as a technology to precisely bond the diaphragm (11) and the voice coil bobbin (13)
vertically! There is a technique in which the jt diaphragm and the voice coil bobbin are integrally
formed by a press machine. However, since this technology is a technology that utilizes the
malleability of metals such as aluminum, it requires a large number of stamping dies (possibly
requiring several faces), resulting in high cost and formation of corrugations. The finishing
accuracy of the centering of adhesion between the edge portion and the diaphragm and the voice
coil bobbin is a problem, which is a bottleneck in manufacturing. The constitution of the present
invention for achieving the object will be described with reference to FIGS. 1 and 2. The present
invention provides a diaphragm made of injection engineering plastic 1) A structure in which
three members of an edge portion (2) and a voice coil bobbin (3) are integrally molded. Since the
present invention has such a structure, it is possible to use an engineering plastic such as
polyethersulfone or PEEK from a pinpoint gate injection port provided at the center of the
diaphragm with a binpoint gate mold. When injection molding is carried out by injecting a
molten solution melted at a temperature of 200 ° C. or higher, a molded article with a thickness
of about 0.05 am can be obtained in the -step. In this molded product, the diaphragm (1), the
edge portion (2) and the voice coil bobbin (3) are integrally formed in a unit of verticality and
concentricity with a precision on the order of 0.001 mm. Therefore, adhesion between the
diaphragm (1) and the voice coil bobbin (3) is not necessary at all. Embodiments of the present
invention will be described with reference to the drawings. The embodiment shown in FIG. 1 is a
vibrating member obtained by melting PES (polyether sulfone) of engineering plastics at about
200 ° C. or higher and injection molding it with a bin point gate mold, and the embodiment
shown in FIG. It has a standard form size of outer diameter 25IIIlφ. The thickness of each part is
about 0.05 zi + and each part is constant. Because the heating deformation is small, a relatively
large current flows to the voice coil (4) at a large input, and even if there is a temperature
increase due to Joule heat, the deformation is small, so a narrow magnetic sky 11! (5) Even if it
vibrates within the gap, the gap (5) rubbing failure of the voice coil (4) does not occur because
the shape retention force is strong. Since the voice coil bobbin (3) usually requires an adhesive
margin (14) for attaching a pool of adhesive to the tip and a bonding step, the finishing accuracy
is low, but in the present invention, the synthetic resin melted in each component flows Because
it becomes an integral molded product, it becomes unnecessary to use a separate adhesive or
glue step (14) for the bonding process, saving labor for labor and achieving a molded product
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with extremely high finishing accuracy. . Since the finished dimensional accuracy of the molded
product is finished in the order of 0.01 scrap, high accuracy can be maintained even after
winding the voice coil (4), so the utilization efficiency of the magnetic gap (5) is also enhanced.
The sound pressure frequency characteristic also becomes flat as the level of the high range and
the high range limit f rise as shown by the solid line graph in FIG.
Therefore, the speaker according to the present invention can reduce the length of the magnetic
gap (5), so that the utilization efficiency of the permanent magnet can be enhanced and the
acoustic radiation efficiency of the speaker can be remarkably improved. Since the vibration
conduction loss of the hammer can be reduced, there is an advantage that reproduction of the
high range is abundant. Although the present invention has been described as applied to a domeshaped diaphragm, the present invention can also be applied to a so-called cone-shaped
diaphragm having a dome-shaped vibrating portion and a vibrating portion formed in a cone
shape. Although the embodiments considered to be representative of the present invention have
been described above, the present invention is not necessarily limited to only the structure of
these embodiments, and includes the constituent requirements of the present invention and the
object of the present invention. It can be suitably modified and implemented within the scope of
achieving the effects described below. Effect of the Invention As already apparent from the above
description, the present invention uses a material such as an engineering plastic which has high
quality but has not been used as a raw material of a conventional speaker, but is expensive. A
remarkable effect is obtained by utilizing the axial symmetry to obtain a speaker vibrating
member that incorporates characteristics and processing methods that are not included in other
molds, such as center-encapsulation of a bin point gate mold. It is now possible to expect Further,
since the mark of the bin point gate of the molded product is about 0.5 zzφ, it is possible to
finish easily with a simple tool like a nipper and a file.
[0002]
Brief description of the drawings
[0003]
Fig. 1 is a partially cutaway perspective view showing the structure of a vibrating portion to
which the present invention is applied, Fig. 2 is a cross sectional view of a soft dome type
speaker to which the present invention is applied, and Fig. 3 is a speaker to which the present
invention is applied And FIG. 4 is a cross-sectional view of a conventional product.
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In the figure, (1) is a diaphragm, (2) is an edge portion, and (3) is a voice coil bobbin. Figure 2
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