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JPS53157724

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Notice
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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS53157724
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an example of a
conventional coaxial speaker, and FIG. 2 is a sectional view showing an embodiment of the
coaxial speaker of the present invention. 1 и и и и и и и и Center pole, 2 и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и 6 ииииии Uno--cone paper, 7 ииииииииииииииииииииииииииииииииииииииииииииииииии Tweeter 7.11
ииииииииииииииииииииииииииииииииииииииии Dust cap. ?
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of coaxial speakers. The conventional core 7 dial speaker is configured as shown in FIG. That is,
the base of the speaker is a circular bottom plate 2 integrally having a center pole l, a donutshaped permanent magnet 8 concentrically fixed on the substrate, and a donut concentrically
fixed on the permanent magnet The base end portion of a conical frame 5 is fixed on the top
plate 4 so as to be sequentially opened forward (upward in the figure). The outer peripheral edge
of the cone paper 6 of the woofer is fixed to the outer peripheral edge of the frame 5, and the
inner peripheral edge of the cone paper 6 is fixed to the front end of the voice coil bobbin 7. A
voice coil (not shown) is wound around the coil bobbin 7 so that a signal can be applied to the
voice coil via a flexible electric wire .quadrature.2-71) connected to an input terminal (not
shown). It shall be. The coil bobbin 7 is inserted into the gap formed by the center pole 1 and the
central hole of the top plate and the central hole of the permanent magnet 8 except for the front
end, and the coil bobbin 7], The coil bobbin 7 has a center pole 7 and a top grate 7 by fixing the
inner peripheral edge portion of the damper 8 formed with the ripple-like fold and the outer
peripheral edge portion of the damper 8 to the base of the frame 5. It is positioned so as not to
contact 4th grade. A magnetic shield @ 9 is fixed to the front end face of the center pole l, and
the proximal end of the tweeter 10 is fixed to this shield plate. A disk-shaped dust cap (also
referred to as a chamber) 11 having a corrugated crease is fixed between the Uno--con paper 6
and the tweeter 10, and between the coil bobbin 7 and the center pole 1. Dust does not intrude
into the air gap. The dust cap 11 is designed so as to weaken the elasticity as much as possible,
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as it does not limit the vibration of the Uno--cone paper 6 and to make the elasticity as small as
possible. Only by forming the ripples on the cap 11, the woofer's cone paper 6 is stretched as the
whole is in the form of a disk, and the amplitude of the woofer's cone paper 6 is regulated, and
the woofer is The required large amplitude could not be obtained, and it was difficult to faithfully
reproduce the low frequency of adult power. The present invention aims to solve the drawbacks
found in such conventional coaxial speakers, and aims to achieve the object by improving the
shape of the dust cap.
The invention will now be described by means of the embodiment shown in FIG. In FIG. 2, the
center pole "2: pierced, permanent magnet 3, top plate 4, fleece, 7 a half, a half, 5 half, woofer
cone paper 6, damper 8. f! The i knee shield plate 9 and the tweeter -1O are constructed in the
same manner as the conventional example shown in FIG. However, the voice coil hovin 7 is made
long, and the inner periphery of the cone paper 7 and the damper 8 is fixed to a portion near the
front end of the bobbin 7) so that the front end of the bobbin 70 is outward. Projected into
Further, the dust cap 11 is folded back in a V shape at its outer peripheral portion to form a
horizontal portion lla and a conical portion 11b, and the inner peripheral edge portion of the
horizontal portion 11a is a tweeter -10 and the inner cylindrical edge of the conical portion 11b.
The dust cap 11 is fixed to the front end of the coil bobbin 7 in this manner. When the dust cap
11 is thus configured, the horizontal portion 11 a and the conical portion against the picking up
movement of the coil bobbin 7 in the central axis 0 direction. By bending the folding back
portion 11c with 11b, it responds much more easily than the dust cap in the conventional one of
FIG. Accordingly, since the dust cano 7! ? does not regulate the amplitude of the cone paper 6 of
the woofer, it is possible to obtain the large amplitude required for the woo. r You can play it. In
addition, since the dust cap 11 can easily absorb the vibration of the voice coil 7 by the V-shaped
folded back portion lie, the dust cap 11 is required to form a 5-hearted corrugated ripple.
Although not required, in order to absorb the vibration of the voice coil 7 more easily, it is
preferable to form a ripple like fold as in the embodiment shown to make the dust cap 11 more
flexible. Also, the dust cap 11 may be integrally molded of one material, or may be bisected with
the outer peripheral edge 11C as a boundary, and the outer peripheral edge 11c may be bonded
later. Furthermore, depending on the form of the dust cap 11, it may not be necessary to make
the voice coil bobbin 7 long.
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