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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an
embodiment of the present invention, and FIG. 2 is a plan view showing a main cone portion and
a first edge thereof. □ 9 ...... cone main portion, 10 ... ... first edge, 11 ...... second edge.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a cone-type loudspeaker, in particular its edge. The cone type speaker is widely adopted for
free edge power because of wide band and low distortion rate, but since the edge S uses a flexible
elastic material with a large internal loss arrow, the vibration system is conventionally used. The
strength of the whole is very weak 9, rolling present urine is generated in the cone (vibration
plate) to cause transient vibration and worsen the wrinkles 0 Also, the mass of the vibration
system is charged As a result, the voice coil is displaced (1) due to this influence, which causes an
image width type to be generated in the low frequency range. And no appropriate measures have
been proposed to address this issue. The present invention proposes one means for solving the
above problems. 1 and 2 show a cone type speaker according to the present invention, (1) a
yoke, (2) a center pole, (3) a permanent magnet, (4) a plate, (5) a frame, 6) voice coil, (7) spider,
18) dust cap, (9) cone main part 1.1illl at a predetermined interval partially provided first edge,
■ provided in an annular shape , The second edge of which the hardness is symmetrical with the
first edge II). In addition, the first inner Tli is a wave yx wedge integrally formed with the main
cone portion (9), and the second edge [11 is a roll-shaped edge of the first edge (−F portion, The
point of @ is not 4 things to add this invention. In the case of the cone type loudspeaker
according to the present invention, the edge is composed of the first edge and the second edge
(2) such as the upper 6g, and the internal loss can be reduced. The strength is increased by 7 and
the rigidity is large to facilitate the movement of vertical vibration, and this function has the
effect of suppressing transient vibration caused by cone paper and improving sound quality. .
Further, the influence of the mass of the vibration system 7 prevents the displacement of the
voice coil and reduces the distortion generated in the low frequency range. As described above,
according to the present invention, it is possible to obtain a single type speaker with good sound
quality and small vibration and distortion by a simple configuration.
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