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JPS50121732

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DESCRIPTION JPS50121732
DETAILED DESCRIPTION OF THE INVENTION The uninvented invention relates to a loudspeaker
having a novel structure that can be used for t-book delivery. Fig. 1 shows one example of the
structure of a cone type dynamic speaker which is conventionally known, so (1) is a magnet, (2)
is a ball, (3) is a yoke, (4) is a voice coil, and (5) is The coil bobbin, (6) is an imaging plate, (force
is a damper, (8) H edge, 19) is a frame. In the above speaker, when the voice coil (4), the
diaphragm t61 and the edge (8) are considered as the vibration system and its operation is
considered, this vibrating thread is an elastic coil which is Skkfi excited by the voice coil (41 It
can be regarded as a transmission line in which waves are transmitted through the diaphragm (6)
and terminated at the edge (8). In this case, regarding the elastic wave transmitted at the end at
edge t81K, if the impedance matching with the diaphragm (6) can be taken, the reflected wave
from this end can be ignored, but in the case of ordinary speakers, the reflected wave is present
If this standing wave, which is combined with the traveling wave from the voice coil (4) to
produce a standing wave, is displaced in the same phase over the entire surface of the diaphragm
(6), the vibration fEf 61 performs so-called piston movement There is no space, but when the
circling is ^ <and the standing wave forms a node on the diaphragm (6), it becomes a split
vibration and affects the sound quality. The following method can be considered to reduce the
divided vibration within this range by limiting the above frequency band. ■ Change the material
of the diaphragm (6) to increase the internal loss. (1) The density of the diaphragm t61 is
reduced and the Young's modulus is increased to increase the propagation speed of the elastic
wave. (2) Use cloth, rubber or the like as the material of the end, that is, the edge (8) to increase
the absorbing ability of the divisional vibration. (2) ■ Shorten the distance from the voice coil (4)
to the end. As shown in FIG. 2 (shown in FIG. 2) based on the above-mentioned {circle over (3)} O
concept. In the figure, only the vibration system is taken out, and the same parts as in FIG. 1 are
assigned the same reference numerals. In FIG. 2 the above-mentioned distance of vibration & (6).
If the length of the voice coil (4) from the center to the edge (8), that is, the outer diameter B, is
defined, the inner diameter r of the voice coil (4) is inevitably increased. In this case, the effective
radiation area of the diaphragm (6) is reduced and the output is reduced, so that the inside of the
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voice coil t4 has a cone-shaped diaphragm (6) opposite to the diaphragm (6). Φ is provided. In
the speaker of FIG. 2, the outer diaphragm (6) has edges (8), so energy absorption is performed
and there are few questions, but the inner diaphragm (peak elastic waves have no energy
absorption end Because a large standing wave is generated and strong!
It becomes k when 1M oscillation is caused. FIG. 8 shows the case where the diaphragm + d + is
dome-shaped, but also in this case the number of energy stages! The problem such as the
occurrence of split vibration as in the case of FIG. 2 (3) without I, also occurs in a loudspeaker
using a conventional dome-shaped diaphragm. In order to solve this, as shown in FIG. 4, the
diaphragm C1 of the dome-shaped speaker (a damping material I such as glass wool is placed
near the top of I to form an apparent energy absorbing end, material of diaphragm dI There are
some that apply a damping agent, but can not give much effect. In addition, although various
methods have been proposed according to the method of the above-mentioned {circle around
(2)}, a satisfactory result could not be obtained. The present invention is based on the concept of
■ above, t! 2nd J. In order to solve 1ljl of the divisional vibration due to standing waves as
described above with reference to FIG. 8 and FIG. 4, as shown in FIG. 8 and FIG. In a speaker
having a speaker and a dome-shaped diaphragm, an edge is provided on the top of each of the
inner diaphragm and the dome-shaped laminated board, and the speaker has a novel structure
using this edge as an energy absorbing end. It is provided. An embodiment of the present
invention will be described below with reference to the drawings. (4) FIG. 5 company The first
embodiment of the present invention is shown, and the same parts as in FIG. 1 and FIG. In the
figure, it is provided in the vicinity of the top of the vibration * td + of the internal
reconnaissance at the second branch of the second branch N-. IILl is a support and is protrusively
provided on the pole (2) 9, and the second edge wedge is attached at the top by screwing or the
like. The second edge q is formed in a ring shape using the same material as the first edge (8) of
the outer diaphragm (6). According to the structure of FIG. 115, in the case of the external
impedance (6), it is possible to shorten the length deficiency and raise the frequency at which the
divided vibration is caused by the high frequency, and Since the energy of d + is generated and
the energy of the split vibration can be absorbed from the second edge (laK, the length of the
recombine is short and the frequency of the split vibration can also be increased. FIG. 6 shows a
second example of the present invention, and the present invention is applied to a speaker
having a tom IJ diaphragm Ql according to the prior art from the prior art, and the second
modification 7 is applied to the top of the diaphragm +11. 0 (5) is provided. Although the
foregoing has been described with respect to a dynamic type speaker, the present invention can
be applied to other direct emission type speakers.
According to the present invention, in the speaker having the diaphragm and the dome-shaped
diaphragm on the inside and the outside of the voice coil, respectively, the edge t of the inner
diaphragm and the dome-shaped diaphragm have edges t. By setting up, it is possible to collect
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VC energy more effectively than a conventional speaker with an edge provided only on the outer
diaphragm or a dome-shaped speaker. It is possible to suppress the width.
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