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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio equipment.
2. Description of the Related Art In recent years, the demand for high input resistance has been
extremely increased for speakers used for applications such as single component components,
mini components or pro audio systems for concerts. In addition to paper and cloth
conventionally used as materials for cone surfaces and edges, resin-based materials such as PP
(polypropylene) and PMP (polymethylpentene), which are highly popular for improving
appearance quality, and edges Resin-based materials such as elastomers and rubber-based
materials are being diversified.
The conventional speaker will be described below based on the background. FIG. 3 shows a
conventional loudspeaker of this type, in which a frame 6 is coupled to an upper plate 2 of a
magnetic circuit 4 configured by sandwiching a magnet 1 by an upper plate 2 and a lower plate
3. The diaphragm 9 is formed by bonding a cone surface 7 made of PMP (polymethylpentene)
resin and an edge 8 made of an elastomer to a portion thereof. In this case, the material of these
cone surface 7 and edge 8 Is a resin-based material, and since these resins have very poor
adhesion by an adhesive, the adhesion of the two is pre-primed to the adhesion surface 7a of the
cone surface 7 and the adhesion surface 8a of the edge 8 in advance. After the treatment was
carried out to improve the adhesion, a process was used in which bonding was performed using
an adhesive.
Then, a voice coil 10 for driving the diaphragm 9 is coupled to a central portion of the
diaphragm 9, and an intermediate portion of the voice coil 10 is centered by the damper 11 and
fitted into the magnetic gap 5, the diaphragm A dust cap 12 is adhered to the upper surface of
the joint portion with the voice coil 10 of FIG.
However, in the conventional loudspeaker of this type, a primer treatment and a plasma
treatment are carried out in order to bond the cone surface 7 made of resin and the edge 8 made
of elastomer with an adhesive. This process requires very strict and time-consuming processes
such as concentration management, application amount, application position management,
treatment time management, life cycle management after treatment completion, and the
management is insufficient. If this were the case, a large defect in quality such as occurrence of a
failure due to adhesion failure or failure in adhesion would occur.
An object of the present invention is to solve such conventional problems, and to provide a
speaker which is extremely excellent in adhesion reliability between a cone surface and an edge.
SUMMARY OF THE INVENTION In order to solve the above problems, according to the present
invention, the connection between the cone surface and the edge is sewn, crimped, or driven by
another connecting medium such as thread, wire, rivet, eyelet or stapler. It is configured to be
combined or further implemented in combination with an adhesive.
[Function] With the above-mentioned constitution, the adhesive strength of the cone surface and
the edge, which has hitherto been influenced by the familiarity of the adhesive and the strength
of the adhesive itself, is sutured and caulked by another bonding medium. Since bonding is
performed by a bonding method having higher mechanical strength than bonding, the bonding
reliability between the cone surface and the edge can be significantly improved.
In addition, although the conventional primer processing and plasma processing have been
carried out, management under such severe constraint conditions is not necessary, so it is
possible to reduce the number of processes and management costs.
embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the frame 26 is coupled to the upper plate 22 of the magnetic circuit 24
configured by sandwiching the magnet 21 by the upper plate 22 and the lower plate 23, and
PMP (polymethylpentene) is attached to the periphery of the frame 26. And) bonding the
diaphragm 29 obtained by suturing the joint surface 27 made of resin and the edge 28 made of
elastomer resin together with the adhesive by suturing the joint surface with the thread 33 and
bonding the diaphragm 29 and driving this diaphragm 29 The middle portion of the voice coil 30
is centrally held by the damper 31 and coupled to the central portion of the diaphragm 29 so as
to be fitted into the magnetic gap 25, and the dust cap is provided on the upper surface of the
diaphragm 29 coupled to the voice coil 30. It has a configuration in which 32 are bonded.
Further, FIG. 2 shows a plan view of the diaphragm 27 in a single-piece state, in which a cone
surface 27 made of PMP (polymethylpentene) resin and an edge 28 made of an elastomer extend
over one circumference at its bonding surface. It is sewn by a thread 33, and in order to improve
the strength, it is configured to be sewn one more circumference, i.e., doubly.
Furthermore, in the above embodiment, the thread 33 is used for suturing. However, as a
connecting method other than this, a connecting method such as riveting, eyelet stopping,
stapling may be used.
In the above embodiment, although an example using a material with poor adhesion such as
resin cone surface 27 and elastomer edge 28 is described, a paper cone surface such as a PA
speaker is made of cloth. Even in the case of using a material with good adhesion such as a dust
cap, it is very effective even in the case where it can not withstand high input resistance and
adhesion will be dislocated.
By adopting the above-described configuration, the connection between the cone surface 27 and
the edge 28 is strengthened, and the adhesion reliability can be improved.
As described above, according to the present invention, the bonding of a material with poor
adhesion such as a resin-made cone surface and an elastomer edge is influenced by the adhesion
of the adhesive and the strength of the adhesive itself, Since it is used in combination with a
bonding method with high mechanical strength such as suturing and caulking by another
bonding medium other than the agent, the adhesion reliability can be remarkably improved.
In addition, in the case where the primer treatment and the plasma treatment have been
conventionally performed, it is possible to reduce the number of processes and the management
cost because the management under the severe constraint condition is not necessary.
As described above, the present invention can achieve remarkable improvement in adhesion
reliability, improvement in productivity, and cost reduction, and its industrial value is extremely
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