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JPS60242791

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DESCRIPTION JPS60242791
[0001]
TECHNICAL FIELD The present invention relates to a speaker used for various audio devices. The
configuration of the prior art and the general structure of the problem speaker are shown in FIG.
'(1) is a plate having a center ball (1a), (2) is a ring-shaped magnet, (3) is a ring-shaped plate, and
a field section (4) is constituted by these. The inner peripheral part of the frame (5) is fixed to the
plate (3) of the field part (4), and the outer peripheral part of the frame (5) is edged in a state of
being sandwiched with the gasket (6). The outer peripheral portion of 7) is fixed, and the outer
peripheral portion of the diaphragm (8) is adhered to the inner peripheral portion of the edge (7).
A voice coil (11) whose middle portion is supported by a damper (10) is coupled to the inner
peripheral edge of the diaphragm (8) so as to be properly fitted into the magnetic gap (9) of the
field portion (4). The dust cap (12) is attached to the inner peripheral portion of the diaphragm
(8). In such a configuration, conventionally, as the edge (7), the damper (10) and the dust cap
(12), a large number of thermoformed cloths are used in view of problems such as formability
and flexibility. However, as these components do not have sufficient internal loss, as shown by
the broken line in FIG. 2, the resonance (a) of the damper (10) in the low region and the
resonance (7) of the edge (7) in the middle region. b) In the high region, the resonance (e) of the
dust cap (12) appears to disturb the frequency characteristics and disturb the faithful
reproduction. In order to prevent this, measures are taken such as applying a visco-elastic
material to each of the edge (7), the damper (10) and the dust cap (12). There was a drawback of
that. The object of the present invention is to solve the above-mentioned conventional
drawbacks, and it is an object of the present invention to provide a sharp speaker since the
mechanical resonance of edges, dampers and dust caps is suppressed and flat frequency
characteristics are obtained. In order to achieve the above object, according to the speaker of the
present invention, at least one of the edge, the damper and the dust cap is used in the same
twisting direction and the same number of twists per unit length for the upper twist and the
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lower twist. A fabric woven using twisted yarn is impregnated with a thermosetting resin and is
heat-formed. Description of Embodiments Hereinafter, an embodiment of the present invention
will be described based on the drawings. Fig. 3 (A) is a plan view of the edge (13), Fig. 4 (CB) is a
longitudinal cross-sectional view of the same school, Fig. 4 (A) is a plan view of the damper (14),
and Fig. 4 (B) is a front cross-sectional view of the same school Fig. 5 (A) is a plan view of the
dust cap (15), and Fig. 5 (B) is a front elevational view of the same.
These edge (13), damper (14), and dust cap (15) are obtained by heat-forming the cloth (16)
shown in FIG. 6 impregnated with a thermosetting resin such as phenol. It is. The cloth (16) is
obtained by weaving a twisted yarn (17) as shown in FIG. In FIG. 7, the broken line represents the
first twist, and the solid line represents the first twist. The twisted yarn (17) is made of natural
fibers or synthetic fibers, and the number of twists per unit length is the same for the upper twist
and the first twist, and the twist direction is also the same. FIG. 8 is an explanatory view of the
relationship between the number of twists per unit length of the upper twist and the lower twist
of the twisted yarn (17) and the internal loss of the twisted yarn (17). Indicates one with 5 twists
/ inch. As understood from FIG. 8, the internal loss becomes extremely large when the twist
number of the first twist and the second twist is the same. In the past, even if a cloth was used,
the number of twists between the upper twist and the lower twist was different, and one with a
small internal loss was used, but in this embodiment a twisted yarn with the same number of
twists between the upper twist and the lower twist The edge (13), the damper (14), and the dust
cap (15) are made of the cloth (16) woven with in the above), so their Q value is low, and the
speaker using these suppresses the inherent resonance Ru. Therefore, a flat sound pressure
frequency characteristic as shown by a solid line in FIG. 2 can be obtained. In the above
embodiment, all of the edge (13), the damper (14) and the dust cap (15) are constituted by using
the cloth (16) made of twisted yarn (17), but any one of them may be used. Even if only one or
two are similarly configured, they have an effect in the corresponding frequency band. As
described in detail in the invention, according to the present invention, it is possible to effectively
suppress the resonance and to obtain an inexpensive and high-fidelity speaker without cost
increase.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a general speaker, FIG. 2 is an explanatory view of sound pressure
frequency characteristics of the speaker, FIGS. 3 to 8 show an embodiment of the present
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2
invention, and FIG. Fig. 4 (B) is a plan view of the damper, Fig. 4 (A) is a plan view of the damper,
Fig. 5 (B) is a front view of the same longitudinal section, Fig. 5 (A)-h dust cap A plan view, the
same figure (B) is a longitudinal sectional front view of the same school, FIG. 6 is an enlarged
plan view of cloth, FIG. 7 is an enlarged plan view of twisted yarn, and FIG. 8 is the number of
twists per unit length of upper twist and lower twist. It is explanatory drawing of the relationship
between and the internal loss of twist yarn.
(13) · · · · · · · · · · · · · · Damper, (15) · · · dust cap, (16) · · · cloth, (17) · · · · Yingori Mori Yoshihiro
Figure 1 2 Figure Okaurashiki Figure 3 Figure 4 Figure 5 Figure 6 Figure 7
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