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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of speakers, and more particularly to the improvement of speaker edges. [Prior Art]
FIG. 1 is a cross-sectional view of a speaker, and FIG. 2 is a plan view showing a part of a main
part of a conventional edge by cutting. In FIG. Cone-shaped diaphragm designed to have various
shapes and outer diameters, (2) has one end bonded to the outer peripheral end of the
diaphragm (1) and the other end bonded to the frame (3), and the diaphragm (1) (4) is a spider
that is connected to the bobbin (6) of the voice coil (5) that drives the diaphragm (1) and retains
the linearity of the vibration system including the voice coil (5), (7) is a magnetic circuit for
driving the voice coil (5). The speaker edge (2) configured as described above properly holds the
vibration in the back and forth direction of the diaphragm (1) and prevents the lateral vibration
(rolling) of the diaphragm (1), and the diaphragm (1) ) At the same time, it has a function to
shield sound pressure from the back side so as not to be transmitted to the front side.
Furthermore, the edge (2) itself also contributes to the sound pressure as a part of the diaphragm
(1). In order to conform to such functions, the conventional edge (2) has a half P eye [such as
that shown in FIG. 1 or the like as shown in FIG. 1 so that the longitudinal amplitude of the
diaphragm (1) can be increased. Roll shaped edges are often used. Conventionally, as the material
of the above-mentioned edge (2), as shown in FIG. 2, there are many cases in which resin is
impregnated in a woven fabric of orthogonal cotton yarn having high rigidity to easily move in
the front and rear direction with high rigidity. It is used recently, but its rigidity is low but its
internal loss is large, so foam rubbers such as urethane foam, which easily damps the resonance
of the edge (2) and the resonance of the diaphragm (1), are often used. It became so. However,
although the edge using woven fabric such as the above-mentioned orthogonal cotton is high in
rigidity in the longitudinal and weft directions orthogonal to each other, the rigidity is reduced in
other directions, and therefore the linearity is not good and specific There is a disadvantage that
non-axisymmetric vibration occurs at frequency and the characteristics of the speaker are
degraded. And at the edge of urethane foam etc., its rigidity is very low, and internal loss is not so
great as to damp divided vibration at low frequency that occurs due to low rigidity, resulting in
deterioration of speaker characteristics was there. [Summary of the Invention] The present
invention was made to eliminate the above-mentioned disadvantages of the prior art, in which a
mesh-like knitted fabric is used as two surface materials, and a foam rubber-based material is
interposed therebetween for bonding. The use of the edge provides a speaker of excellent
characteristics having an edge with relatively high rigidity and less anisotropy.
invention will be described below with reference to the drawings. FIG. 3 is a plan view showing a
part of an essential part of an edge of a speaker according to an embodiment of the present
invention, and this edge (2) is a knitted fabric in which a polyester yarn is meshed with a knitted
weave. It is a roll-shaped edge formed by heat-joining a cloth into two surface materials (2a) and
(2b), and sandwiching a urethane foam sheet as a core material (2c) between them in a sand-inch
shape. The Young's modulus of the knitted fabric is desirably greater than the Young's modulus
of the urethane foam sheet 1 and the tensile Young's modulus is 0 °, 45 °, 90 ° and EO- ′ ′
E 45 ′ ′ = E 90 ′ desirable. The car displacement characteristics of the edge configured as
described above were measured, and the resin-impregnated resin cloth was widely used from the
edge formed by molding the urethane foam used in Example 1 as a conventional example and
from 6C. The results are shown in FIG. 4 in comparison with the finished edges (all are roll
edges). The results in FIG. 4 indicate that although the slopes are different because the stiffness
of each edge is slightly different, the linearity of the edge of the example is the best. This is
because the edge of the example adopts mesh-like knitted fabric and urethane foam with less
anisotropy, and because the non-linearity of both is partially offset by the composite, so that it
has further structural symmetry. Is considered to be Next, referring to the stiffness and shape of
the edge of one example and the conventional example as a key relationship, FIG. The sound
pressure-frequency characteristics at are shown in FIG. As shown in FIG. 5, as for the harmonic
distortion of the speaker using the edge of the embodiment, it is confirmed that the distortion of
5 to 10 d 13 is reduced for both 2nd distortion and 3rd distortion compared to the conventional
example, and the linearity is good. It was done. The sound pressure-frequency characteristics in
the high region of Fig. 6 show the phenomenon from the result of holography], and the split
resonance of the edge of kHz to 3 kt + z is 1 k + Iz when the conventional urethane foam edge is
used. On the other hand, in the example, it was revealed that it has risen to 3kllz. This indicates
that the edge of the example has the same level of elasticity as a conventional cottonimpregnated cotton cloth. In addition, since the edge of the embodiment has a relatively large
internal loss, the sound pressure-frequency characteristic is flatter. These effects are unique to
the present invention, and when the materials of the surface material (2a), (2b) and the core
material (2c) are reversed, ie, urethane foam as the surface material (2a), (2b), When a mesh-like
knitted fabric is combined as the core material (2c), the effect is smaller than that of the
embodiment described in 1).
In one example, a polyester yarn was used as the mesh-like knitted fabric, but as this material,
cotton yarn, silk yarn, nylon, acrylic, aluminum, etc. have flexibility, and have required rigidity as
an edge. In the case of fibers, the same effects as those of the second embodiment can be
obtained. Although urethane foam is used as the core material, other foamed rubber materials
may be used. In general, a fiber set with high rigidity: has a high melting point, and it is difficult
to form and join it simultaneously with urethane foam etc. In this case, the fiber is first
impregnated with the required resin, and after molding, urethane foam is not It may be heatbonded and formed, or may be bonded and formed through an adhesive or a liquid adhesive.
Adhesives can also be used to enhance adhesion in the case of heat bonding. [Effects of the
Invention] As described above, according to the present invention, the mesh-like knitted fabric is
used as the surface material, and the edge obtained by joining the foamed rubber-based material
as the core material is used. An edge that is excellent in sex and excellent in symmetry is
obtained, and as a result, there is an effect that the characteristic 4 of the speaker is directed.
Brief description of the drawings
1 is a cross-sectional view of a speaker, FIG. 2 is a plan view showing a part of a main part of a
conventional edge, and FIG. 3 is a part of a main part of an edge according to an embodiment of
the present invention 4 shows the car displacement characteristics of the edges of the
embodiment and the conventional example, and FIG. 5 shows the low-frequency harmonic
distortion characteristics of the speaker using the edges of the embodiment and the conventional
example, FIG. These are sound pressure-frequency characteristic diagrams of the speaker using
the edges of the embodiment and the prior art.
In each figure, the same reference numerals indicate the same or corresponding parts: 0)
m11m4N, (2) hearing, (2a), (2b) ha table Tm material, (2c) core, (3) frame, ( 4) is a spider. Agent
Masaru Oiwa Figure 2 Figure 3 Figure 4
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