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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
cone-shaped speaker, FIG. 2 is a cross-sectional view showing an embodiment of a cone-shaped
sleeker according to the present invention, and FIG. It is sectional drawing which shows another
Example. DESCRIPTION OF SYMBOLS 1 иииии Diaphragm, 3 иииииии Magnetic circuit, 7 иииииииииии Pole-11.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a cone type speaker, and more particularly to a cone type speaker having good characteristics
with less distortion. In general, a cone-shaped speaker has the shape shown in FIG. The first
cabinet Ks, (1) is a conical diaphragm called a cone, (2) is a voice coil wound aS around the
center of the diaphragm (1), (3) is an inner magnet type magnet 5 . -R 4n 2 circuit, (4) frame, (5)
edge, (6) damper, the magnetic circuit (3) is formed by the center ball (7), permanent magnet (8)
and yoke (9) It is configured. or. The crucible is a dustproof cap, and the nuclear dustproof cap
has air permeability and has a role of reducing pressure buildup due to the back pressure of the
diaphragm and blocking dust from entering the magnetic circuit (3) from the outside. It has a
black role. The dustproof cap a is usually bonded to the diaphragm (1) and vibrates together with
the diaphragm (1). This horse proposal relates to the improvement of the above-mentioned
dustproof cap, and further improves the characteristic of the cone type speaker by adding a back
electromotive force suppression function to the pressure reduction function and the dustproof
function of the dustproof cap. It is a thing. The present invention will be described based on an
embodiment of a cone-type speaker according to the present invention with reference to the
drawings. In FIG. 2, 1% 0 is a dustproof cap made of a metallic porous body formed in a
hemispherical shape, and is mounted on the tip of the center ball (7) of the magnetic circuit (3)
by contact or the like. The other structure is the same as that of the conventional example shown
in FIG. A porous metal body is produced by rolling and * sintering a powder of a metal such as
copper, nickel, iron or the like, or a plating thereof, and is characterized by having a conformable
porosity of 90 to 98%. Also, the porous metal body has pores communicating with each other,
and has an advantage that it can be freely selected in the range of the diameter 10808-5 mm of
each pore. Furthermore, the porous gold-gold porous body has the advantage of being twodimensional in that it is solid, and an arbitrary shape can be freely obtained by press molding or
the like. Therefore, if the dustproof cap I in FIG. 2 is made of a porous metal body, the increase in
back pressure of the diaphragm +1) is reduced by the flow of air through the pores of the
dustproof cap housing, and it is not necessary for the diaphragm (1). External force can be
prevented. In addition, the dust-proof air gap serves as a filter and can prevent dust from
invading the magnetic iil abbreviation (3) from the outside. Since the dustproof cap 1 is made of
metal having high conductivity such as copper, it is possible to suppress the back electromotive
force generated by the movement of the diaphragm (1).
That is, when an external force is applied to the normal diaphragm (1), a back electromotive
force is generated in the voice coil (2), and the normal magnetic field of the permanent magnet
(8) is adversely affected by the AC magnetic field by the back electromotive force. By placing the
dust cap on the center ball (7), the counter electromotive force is consumed as an eddy current,
which causes the magnetic field of the permanent magnet (8) to be stabilized. Distortion can be
prevented. FIG. 3 shows another embodiment of the present invention, in which a hemispherical
It! Is used instead of the hemispherical dust cap shown in FIG. It is a case where a dustproof cap I
made of a porous metal porous body having l1s (13 and a leg projecting from the head 0 (14 is
used. Thus, the leg portion I of the dustproof cap a is arranged to be fitted in the hole Q1 of the
center ball (7). In the embodiment of FIG. 2, since the shield cap is only placed on the center pole
(7), the AC magnetic field crossing the center pole (7) in the vertical direction in the figure is
removed. In the case of FIG. 3, it is a black ink 5 having a leg a4 that the dustproof cap ?? is in
the hole as of the center ball 7 in the case of FIG. It also has the effect of removing the AC
magnetic field that traverses in the left-right direction, and can further suppress the distortion
generation effect. As described above, since the cone type loudspeaker according to the present
invention uses the supplementary porous body for the protective cap, it is practical to reduce
back pressure, prevent dust from being mixed, and prevent distortion due to back electromotive
force. It is a thing.
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