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Description 1 Title of the Invention
3. Detailed Description of the Invention The present invention relates to a speaker edge which is
particularly excellent in heat stability or heat resistance. Among the speakers, a horn type
speaker having a dome diaphragm is shown in FIG. 1 as shown in FIG. 1. The voice coil 2 is
adhered to the outer periphery of the diaphragm 1 and the edge 3 is adhered and the outer
periphery of the edge 3 is fixed to the plate 4 The voice coil 2 is supported by the plate 4 and the
pole 5 so as to axially vibrate in the magnetic gap in the magnetic gap, and the equalizer 6 is
disposed in close proximity to the diaphragm 1. The edge 3 in such a horn-type speaker supports
the voice coil 2 and the diaphragm 1 so as not to contact the wall surface of the narrow magnetic
gap or the equalizer 6 and makes linear and large displacement with respect to axial vibration, In
order to absorb the vibration reflected from the fixed end of the edge of the edge 3 as the end of
the vibration system and to effectively damp the harmful vibration, it must have a suitable
hardness and internal loss, but It is required to possess the following characteristics. First of all,
in the horn type speaker as shown in FIG. 1 in particular, Joule heat generated in the voice coil 2
is not sufficiently dissipated in the air and is transmitted to the edge 3 in the early stage. Keeping
the physical properties at high temperature, that is, heat resistance, secondly, to be light in order
to increase the sound pressure radioactivity rate, and third, to make the edge shape into a
corrugated shape It is required that EndPage: 1 which has been molded and obtained a large
displacement has properties such as good thermoformability. Conventional edges include metal
foils such as aluminum, duralumin, titanium, etc., and those formed into a corrugated shape
integrally with the diaphragm, and edges made of a polyimide resin film, and these edges are
excellent in heat resistance. Although the former has low internal loss and high hardness and low
elongation rate, it is difficult to mold and has poor workability, and the latter is a thermosetting
resin, so molding is not possible. It is possible, and in the structure used as it is as a flat plate,
there is a drawback that the displacement in the vibration direction can not be sufficiently taken.
The present invention is an improvement of such a conventional defect, and one embodiment will
be described below. The edge substrate of the present invention belongs to a thermoplastic
aromatic polyester-based resin and is composed of a polyarylate resin composed of a basic
structural formula and a phenol, and an amide group is used to impart solvent resistance to this
polyarylate resin An edge substrate which has been denatured and formed into a film is loaded
into a double-sided heater, and heated to a temperature of 220 to 240 ° (L7) to soften it, and
immediately thereafter, the pressure is 1.5 to 8.0 kf with a room temperature mold / CA, and
pressure forming is performed for about 15 seconds to form a predetermined corrugation shape.
At this time, the heat is conducted to the mold and dissipated, and the film is cooled and cured.
Thereafter, the formed film is taken out of the mold and the unnecessary portion is punched out
to complete the product. Such an edge is a structural unit in which a polyarylate resin as a base
material is a structural unit in which a structurally rigid aromatic nucleus is linked by a movable
ester bond, so that it is strong and excellent in stability and excellent in heat. It has stability or
heat resistance. In particular, as shown in the dynamic viscoelastic coefficient (E) temperature
characteristics and the dynamic loss 'one-character temperature coefficient (tan δ) temperature
characteristics' of the polyarylate resin in FIG. It is significantly higher than films and is above
200 ° C., and its initial excellent physical properties are retained even at high temperatures of
200 ° C. In addition, since it does not crystallize due to heat and other environmental changes
and aging due to non-productivity, the change in initial physical properties is small and the longterm stability is excellent. Therefore, such polyarylate resin-based edges use such edges because
they maintain the physical properties as a peripheral support, in particular the dynamic elasticity,
and the internal loss even at a high temperature of 200 ° C. In the horn-type speaker, when
Joule heat generated in the voice coil is transferred to the edge and the temperature rises (the
edge does not lose its function as a peripheral support even if it is stored, and it retains
appropriate internal loss) Therefore, there is no deterioration as a peripheral support under high
temperature as in the prior art, and the voice coil and diaphragm do not contact the magnetic
gap wall surface due to thermal deformation of the edge, and further fixing the outer edge of the
edge. Since the vibration reflected from the end and harmful vibration are effectively attenuated,
the diaphragm vibrates faithfully according to the electric input, and there is no deterioration of
the sound quality, and the horn type speaker of stable quality. There can be realized. In addition,
since the specific gravity of the polyarylate resin is about 1.2 and is lighter than other resins, the
edge can be reduced in weight, and the acoustic activity rate can be improved. Furthermore,
since the polyarylate resin is excellent in thermoforming property and can be easily formed into
a predetermined shape such as a corrugation shape, it has an excellent advantage such as being
able to realize an edge capable of linear and large displacement as a peripheral support. As
described above, since the present invention uses a polyarylate resin composed of an aromatic
dicarboxylic acid and a dihydric phenol as an edge base, it is particularly thermally stable to
retain the initial excellent physical properties even at high temperatures. That is, it has the heat
resistance, and has the advantage of being able to realize a speaker of excellent quality.
4. Brief Description of the Drawings FIG. 1 is a view showing a structure of a conventional
speaker, and FIG. 2 is a view showing dynamic viscoelastic temperature characteristics of a
polyarylate. EndPage: 2
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