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Physical properties to be stored in the speaker edge are better than before (1) the internal loss is
appropriate. (2) It should be lightweight in order to suppress an increase in weight 11'L of the
vibration system. (3) There is little difference 1 in the direction of expansion and contraction. (4)
Non-breathable 3 ° (5) Initial Special 1. Little change over time. (6) The center support ability of
the movable plate is large. Shields can be mentioned, but at the edge of J1 Kogamigawa beaker,
the use conditions are severe (I'i '+ IIl high humidity), and in addition to the above-mentioned
physical characteristics, (7) heat resistance should be good. (8) There is no change in physical
characteristics in the humidity range in the use state. (9) Water resistance and moisture
resistance should be good. Is required. Here, regarding the conventional speaker edge,
considering from two viewpoints, in the edge impregnated with or coated with a pheno-) V resin
or acrylic resin, an internal loss is used as the base material on a woven fabric made of cotton,
silk or polyester. Although light weight, center support, heat resistance, and temperature change
are relatively good, blade property, air permeability, aging, and water resistance 4 moisture
resistance are not sufficient. Therefore, in recent years, particularly in high-pitched speakers
having small amplitude, an edge obtained by vacuum or pressure-forming a polyester film has
been put to practical use as one satisfying the various requirements except heat resistance and
temperature change characteristics. However, the temperature of the polyester film Enosha heat
f-type is about 70 ° C., and at 80 ° C. to 90 ° C., thermal deformation occurs and the
diaphragm supporting function is deteriorated. When the temperature is about 70 ° C. or more,
the Young's modulus drops sharply to change the diaphragm support function, which affects the
sound quality. In particular, when using polyester film edges for automotive speakers, for
example, in a rear parcel tray under direct 1-1 light? ii: Even when the temperature reaches 90
° C. to 100 ° C., the heat distortion of the edge causes the speaker to be inoperable due to the
thermal deformation of the edge, and causes the change in the sound quality and the like.
Therefore, the present invention is excellent heat resistance 1 乙 1 Polyneite Lz 1 m 1 l l '? The
sheet is a sheet formed by molding a mixture mainly composed of a polyester terimido resin, and
solving the above-mentioned disadvantages of the conventional example. The examples will be
described in more detail below. [Example 1] A polyetherimide resin film having a thickness of 70
tt m is placed between room temperature and a lower mold and heated to a temperature of 240
° C to 250 ° C by a far-infrared heater to remove the heath. The upper and lower molds were
immediately combined and molded into an edge shape at a pressure of 5 to 5 [Example 2] A
mixture of alumina powder of 3ω1 /% with a polyester terimid resin was molded into a 70 μm
thick film.
The film is placed between the upper and lower molds at room temperature and heated to 240 °
C. to 250 ° C. by the far infrared heater, the heater is removed, and the upper and lower molds
are immediately combined. As a test piece, a part of the edge molded in Example 1 and 2 molded
into a shape was cut out and measured in terms of density, internal loss and heat distortion
temperature item. (The heat distortion temperature depends on A S T IV 4: D 648.) As described
above, the edge according to the present invention has the advantage that the heat deformation
temperature is extremely large and the internal loss is large. Therefore, 1) it is most suitable for
fishing at the edge of an on-vehicle speaker used at high temperature with the advantage of 11
persons, and A! What is the ratio? ! ll'L PI change was measured. Polyether ene decreased
Young's modulus by 50% over 50 ° C and over 100 ° C. The change in Young's modulus at 27
° C and the change in Young's modulus between room temperature and 100 ° C, which is
considered to be the maximum temperature in the car, is about 17 or 6, improving the change in
physical properties of the edge with temperature I found that. In addition, since 7 Jl, which has a
large internal loss, is suitable for absorbing the kinetic energy transmitted from the diaphragm, it
is also effective in suppressing harmful resonance such as anti-resonance. As described above,
the present invention is an edge formed by molding a polyetherimide resin or a mixture mainly
composed of a polyetherimide resin, and the physical properties due to heat resistance glaze and
temperature change9. It can improve the change of j cases, and it is particularly effective as an
edge of an in-vehicle speaker, and even if it is used under high temperature in the car, the sound
quality change due to the occurrence of the malfunction of the speaker or the temperature
change It was possible to suppress. Furthermore, due to its relatively large internal loss, it has
been found that vibration energy absorption is good, and it has the effect of suppressing harmful
interference, etc., thereby providing a speaker that achieves more flat frequency characteristics. .
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