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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a conventional
loudspeaker, and FIG. 2 is a longitudinal sectional view showing one embodiment of a single
loudspeaker according to the invention. FIG. 3 is a perspective view of the adapter 12 fixed to the
pole piece hollow portion 11. 9 ······· pole piece, 11 ································ Adapter, 13 ························· In
the drawings, the same reference numerals indicate the same or corresponding parts. JリT
DETAILED DESCRIPTION OF THE INVENTION This invention is a book related to the
improvement of a speaker having a hollow portion in a pole piece. Conventionally, there has been
a speaker shown in FIG. 1 as a rice speaker. In FIG. 1, (1) is a diaphragm, (2) is an edge, (3) is a
cap adhered to the diaphragm fi +, (4) is a damper, (5) is a voice coil, (6) is a frame, A +71 u plate,
(8) is a magnet, (9) is a pole piece having a hollow portion at +, in particular, an air gap. Next, the
operation will be described. A magnetic circuit is constituted by the pole piece (9), the magnet (8)
and the plate (7) (1) /, 'f / · t', and an air gap is provided in part of the magnetic circuit. In the
magnetic field of the air gap 6, the voice coil (5) is held by the damper (4) and the edge (2), and
the damper (4) and the edge (21 are fixed to the plate (7) It is adhered to 6). When an input is
applied to the voice coil (5), the voice coil (5) vibrates to vibrate the diaphragm fi1, but at the
same time the cap (3) is also vibrated. For this reason, the air under the cap (3) also vibrates to
cause air column vibration in the pole piece hollow portion αυ, and extra vibration is applied to
the cap (3) by resonance. Conventionally, in the speaker of this type, the hollow portion 111 is
filled with a sound absorbing substance such as glass wool or foamed plastic to cope with the
above-mentioned drawbacks. However, such a sound absorbing substance has poor heat
conduction and poor heat radiation effect. In addition to the drawback of raising the temperature
of the voice coil (5), there has been the disadvantage that acoustic load is applied and braking is
applied. (2) The present invention has been made to eliminate the above-mentioned conventional
drawbacks, and prevents air column resonance of the hollow portion of the pole piece without
raising the temperature of the voice coil, and does not apply an acoustic load. Therefore, the
purpose is to provide a speaker that can prevent an adverse effect on sound quality and can add
a larger input. Hereinafter, an embodiment of the present invention will be described. FIG. 2 is a
longitudinal sectional view showing an embodiment of a speaker according to the present
invention, in which f11 is a cone-shaped diaphragm, (2 (and (4) is a diaphragm (11 and this
diaphragm (1) An edge and a damper for holding a vibration system formed by the voice coil +51
fixed, (3) a cap fixed to the diaphragm i11, (6) a frame attached to the plate (7), (8) a magnet , (9)
is a pole piece forming a magnetic circuit with the frame (7) and the magnet (8), αI1 is a hollow
portion provided in the pole piece (9), 0I is an air gap, and GW is a hollow portion a11 For
example, an adapter formed of copper or the like having good heat conductivity, α 3 is a
plurality of radial slits formed by the adapter '′ AK set- (3).
Next, the operation of the speaker according to the invention will be described. When an input is
applied to the voice coil (5), vibration occurs in the voice coil (5), and the same vibration is
transmitted to the diaphragm i11 and the cap f31K. The air column resonance of air in the pole
piece hollow portion aυ confined under the cap (3), which has been trapped by this vibration in
the prior art, is made by the adapter z z of the insert z fixed in the pole piece hollow portion by
f13, The resonant frequency moves higher and is out of band. Also, compared to other foamable
materials having sound absorbing properties, the air permeability is good, the sound pressure
load is significantly improved, and the damping to vibration is eliminated. At the same time, the
heat generated from the voice coil (5) is transmitted to the pole piece (9), conducted to the heat
conductive adapter α3 and dissipated into the air, and is dissipated into the air from the
breathable Surin) K Thus, the temperature rise of the voice coil (5) itself can be suppressed to a
lower level. In addition, although the cone-shaped speaker was (4) illustrated in the abovementioned embodiment, it is not limited to this, and it is equally applicable to a dome-shaped
speaker, and in addition, if it is a speaker having a hollow portion in a pole piece Any of the
above can be applied, and the same effect as that of the above embodiment can be obtained. As
described above, according to this invention, since the adapter ti2 formed of the material having
good air permeability and good heat conductivity and having the six radial slits α3 is fixed to the
pole piece hollow portion α 、, the temperature of the voice coil (5) It is possible to prevent air
column resonance of the pole piece hollow portion Ql without raising it, and to eliminate the
damping on the vibration system, thus preventing the influence on the sound quality and adding
a larger input. .
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