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JPS5849766

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DESCRIPTION JPS5849766
[0001]
The present invention relates to an adhesive material, and more particularly to an adhesive
material for joining a bobbin having a voice coil wound on a speaker diaphragm, and the object
of the invention is to increase the elastic modulus to increase the upper limit frequency fH. An
object of the present invention is to provide an adhesive material capable of moving to a higher
frequency side and expanding a reproduction band of the speaker. In general, in a speaker, a
bobbin obtained by winding a voice coil on a speaker diaphragm is joined using an adhesive, and
a chloroprene rubber-based or epoxy-based one is often used as the adhesive. The high
frequency limit frequency fH of the speaker is considered to be proportional to the specific
vibration modulus of the speaker vibration and plate φ ', / p (E: elastic modulus, ρ: density) It
has been found that the attachment of the diaphragm to the bobbin is strongly related to the
elastic modulus of the root portion, and particularly to the elastic modulus of the adhesive
present at the root portion. However, the conventional adhesive has an elastic modulus of 2, 45 x
10 dyn / Li chloroprene rubber in the case of epoxy, and has a lower elastic modulus, which
suppresses the high frequency band limit frequency fH of the speaker to a low level. There was a
problem that. The present invention solves the above-mentioned conventional drawbacks, and is
an adhesive substrate filled with at least one kind of high elastic modulus fiber 1 particle, hollow
particle and scale-like material as a filler. As a result, the elastic modulus as the adhesive can be
increased, and the high band limit frequency / H of the speaker can be moved to the high band
side to expand the reproduction band. Here, high elastic modulus fiber set as a filler refers to
fibers having an elastic modulus of 7 × 10 ′ ′ dyn / − such as carbon fibers, aramid fibers,
glass fibers, etc., and particles are organic. Inorganic whiskers, silicon carbide (SiC), diamond
powder, boron carbide (B4C) and the like, which have an elastic modulus of 7 × 1 o 11 dyn / −
or more, hollow particles are glass microballoons and carbon microballoons. The scaly material
refers to glass flakes, scaly graphite and mica. In addition, as the adhesive base material, various
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types of adhesives such as solvent type such as chlorobrene rubber based and epoxy based twocomponent reactive curing type, rL UV curing, electron beam side dilatability, etc. can be used. .
Hereinafter, the present invention will be described with reference to the drawings of the
embodiments. The drawing shows an embodiment of the present invention. In the drawing, 1 is a
diaphragm made of a paper cone, and an edge 2 is integrally formed on the outer periphery
thereof. A bobbin 3 has a voice coil 4 wound thereon, and is bonded to the diaphragm 1 with an
adhesive 6 of the following documents 1 to 7.
Further, a dust cap 6 is provided at the center of the diaphragm 1. The vibration system
configured in this manner is supported by the damper 7 provided on the bobbin 3 and the work
/ node 2 so that the voice coil 4 can move in a magnetic gap of a magnetic circuit (not shown).
The upper limit frequency fH when measuring the frequency characteristics with the standard
box is shown in the table below. n Chlorinated rubber-based adhesive (trade name Diabile 1600)
manufactured by nU 11 Nogawa Kokecaru is used as a base material, and 20 wt% of carbon
fibers with three fiber lengths are mixed with 80 wt% of the five adhesive base materials, and a
ball mill The mixture was well stirred for several hours and used as an adhesive. Reference 2
Conicy epoxy-based two-component reaction curing type adhesive (brand name: Bond Quick Set)
is used as a base material, and aramid fiber with a fiber length of 1.6 mm (trade name: Kevlar 49) 20 wt% After mixing well with one resin, the other resin was used well as an adhesive.
Similar to the data 3 and the data 2, the epoxy adhesive was mixed with 1 owt% of
polyoxymethylene whisker of 60 μm in length, and was used as an adhesive. Material 4 UV
curable resin mixed with silicon carbide (particle diameter 6 μm) 1Q wt well in a ball mill is used
as an adhesive, this adhesive is applied to the junction with the bobbin, and then it is cured by
UV irradiation and curing The Material 6 Electron beam curing resin is used as an adhesive after
mixing well with a glass microballoon y2owt% with a particle diameter of about 20 μm in a ball
mill, this adhesive is applied to the junction with the bobbin, and this is then irradiated with an
electron beam. It was cured. Sample 6 A mixture obtained by mixing well 20 g of scaly graphite
in a ball mill with a chlorobrene rubber adhesive and used as an adhesive. Material 7 A mixture
of an epoxy two-component reaction curing type adhesive with a fiber length of 3 m, a glass fiber
with a fiber diameter of 10 μm and a fiber length of 1 and a fiber length of 1 and 6 wt. Rubberbased adhesives can be diluted with an organic solvent, and thus have the advantage of being
able to select any viscosity when mixed with the filler. Epoxy-based adhesives have the drawback
that they are difficult to work because of the short curing time after mixing with two liquids, but
they have high modulus of elasticity and excellent solubility after setting. As described above,
according to the present invention, since the adhesive base material is filled with at least one
kind of fiber 2 particles of high elastic modulus, hollow particles, and scaly material as filling
material, the elastic modulus as the adhesive is improved. In particular, it is effective for joining a
speaker diaphragm and a bobbin.
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And, the attachment of the diaphragm to the bobbin has an advantage that the elastic modulus of
the root portion can be increased, and the high frequency band limit frequency fH of the speaker
can be moved to the high frequency side to expand the reproduction band.
[0002]
Brief description of the drawings
[0003]
The drawings are block diagrams showing the main parts of a speaker using the adhesive of the
present invention.
1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · voice coil.
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