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JPS55165591

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DESCRIPTION JPS55165591
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional cone-shaped
speaker, and FIG. 2 is a sectional view showing an embodiment of the cone-shaped speaker
according to the present invention. 1 ······· Corn paper, 2 ········· Dust cap, 4 ······· Voice coil, 10 ··· Air
chamber, 11 ····· Pole piece, 1 and 2 ...... air vent hole, 13 ...... protrusion. In the drawings, the same
reference numerals indicate the same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION The invention relates to the improvement of a
cone-shaped loudspeaker. A conventional cone speaker is shown in FIG. In FIG. 1, 1 is corn paper,
2 is a dust cap, 3 is an edge, 4 is a discoil, 5 is a scan, 6 is a frame, 7 is a plate, 8 is a macnet, 9 is
it? -10, an air chamber. By the way, conventionally, in a dome-shaped speaker or a semi-dome-1"7. The noise was reduced and the Q control was performed. However, in the conventional coneshaped speaker, no hole is made in the pole piece 9 as shown in FIG. 1, and in the bass speaker,
the cone paper 1 or the discoil 4 has several holes in the bin It was enough to purge the air. For
this reason, the resonance of the air chamber 10 below the dust cap 2 in the figure does not
disappear, and there is a disadvantage that control of Q is impossible. The present invention was
made to eliminate the above-mentioned drawbacks, and it is an object of the present invention to
provide a cone-shaped speaker capable of reducing air chamber resonance and controlling% Q.
An embodiment of the present invention will be described below with reference to FIG. FIG. 2 is a
cross-sectional view showing an embodiment of a cone-shaped speaker according to the present
invention, in which 11 is I-rubys, 12 is an air venting hole% 13 is a centering portion. The other
parts are the same as in FIG. 1 and the same reference numerals are therefore attached to the
same parts and the explanation thereof will be omitted. When the cap 2 and the coil 4 are
connected to the air chamber 10 formed by the bottle and the back side of the pole piece 11,
both sides of the hole 12 are formed on the inner wall Ii of the air removal hole 12. A partially
reduced protrusion = 13 is provided. In such a cone-shaped speaker, the air chamber 10 which
has been closed by the pole piece 11 and the conventional speaker C is in communication with
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the back side of the pole piece 11 and the air chamber 10 is open. Resonance is reduced. Further,
since the projecting portion 13 is provided on the inner wall of the air venting hole 12, the
increase / decrease of the cross-sectional area of the air venting hole 12 by this K is set to
control Q. In the illustrated embodiment, the projecting portion 13 is formed simultaneously
with, for example, cutting the pole piece 11 to form the air venting hole 12, but for the purpose
of facilitating the processing, a slightly larger air venting portion 31-is provided. Various
modifications are possible, such as forming the projection 13 by inserting the bush 12 in the hole
12 for I-rubes IIK and inserting the bush into the hole 12 for removing air therefrom.
Further, in the control of Q, a more remarkable effect can be expected by using one sound
absorbing material in combination with the projecting portion 13. As described above, according
to the present invention, the resonance of the air chamber 10 can be reduced because the Zole
piece IIK air venting hole 12 is made clear and the projecting portion 13 is provided on the inner
wall of the air venting hole 12. At the same time,% Q can be controlled, and K has an effect such
that the cooling effect of the pole piece 11 can be increased.
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