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JPS52151020

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS52151020
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view of a conventional domeshaped speaker. FIG. 2 is a half sectional view showing one embodiment of the dome-shaped
speaker according to the present invention, and FIG. 3 is an enlarged sectional view of the
relevant part. 11 ...... field portion, 18 ...... door: - domed diaphragm. 18a ииииии Dome part, 18b
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Voice coil, 20 ......
bobbin /, 20a ...... small-diameter portion, 20b ...... stepped portion, 21 ...... magnetic gap.
The present invention relates to a dome-shaped nubica using a dome-shaped diaphragm, in
which the edge portion of the dome-shaped diaphragm is reinforced by a bobbin of a voice film
to prevent the occurrence of an edge resonance, and It aims to provide something stable.
???????????? (2) The conventional dome-shaped speaker is configured as shown in
FIG. A dome-shaped diaphragm T is provided via a ring 6 on the top of a field portion 6 formed
of a ring-shaped magnet 3 and a ring-shaped magnet 3 having the same function as the center
bow A1. [L, l9 I9 edge portion of the dome-shaped diaphragm T by l baffle plate 8 l9 voice coil 9
is coupled to the rising edge portion T of this dome-shaped diaphragm a, the lower portion of
this voice coil e It is configured to fit into the magnetic gap 1 o of the magnetic portion 6. In this
configuration, the voice coil 9 is coupled to the rising portion a of the dome-shaped diaphragm 7
so that mechanical strength is equal to light, but a part of the edge of the dome-shaped
diaphragm T is formed. The flat portion 7b is not sufficient, and when vibrated, the dome portion
vibrates in the same direction as the voice coil 9, but the flat portion 7b of the edge generates an
edge resonance that vibrates in the opposite direction to the voice coil 9. The occurrence of this
edge resonance is 10KH1l! In the above-described three high frequencies, peaks and dips occur
in the sound pressure-frequency characteristic, which causes the reproduction not to be
performed sufficiently. In particular, this phenomenon is more often found in diaphragms made
of flexible materials such as cloth, paper, synthetic resin films, etc. than diaphragms made of hard
materials such as aluminum and titanium. However, in any of the materials 4, edge resonance is
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likely to occur, and the tweeter can not sufficiently exhibit its performance. From such a point of
view, the separately formed reinforcing material is an edge. Although there has been developed a
type that is connected to a part, this is time-consuming to assemble, and it is disadvantageous in
terms of cost due to an increase in component parts. 4 is to eliminate the drawbacks. Hereinafter,
the present invention will be described with reference to FIG. 3 and FIG. Reference numeral 411
denotes a field portion, and a field s11 of a grain is constituted by a plate 13 provided with a
center pole 12, a link-like magnet 14, and a ring-like upper plate 16 as well. In addition, you may
use the boundary am of the structure which integrated the columnar magnet or the columnar
magnet, and the ball peen in wedge shape l-.
A dome-shaped diaphragm 18 whose peripheral portion is held 1 by the aIJ song 6 and the baffle
plate 17 is disposed on the field 9 11. The dome-shaped diaphragm 1 @ has a dome portion 18a
at the center, an edge 18b at the R edge of seven, and a rising edge @ 1110 on the outer
periphery of the dome portion 1B-. A flat portion 1 in a part of the edge 111b continuous with +
$ 180! It is configured to form Ib '. A voice coil 19 is coupled to such a dome-shaped diaphragm
1B. That is, on the upper portion of the coil bobbin 20 of the voice coil 9, the small percentage
portion 20a in contact with the rising portion 1saK and the flat 1! A stepped portion 20b in
contact with l11ab 'is formed, and is coupled to the six raised portions of the dome-shaped
diaphragm 18 by means of an agent or the like of the step diameter portion 20m and the stepped
portion 20bt11. The lower part of the voice coil 1 is t at the magnetic gap 21 of the field section
11. With this configuration, when a signal is applied to the voice coil 9 and the voice coil 19
vibrates, the dome-shaped diaphragm 18 to which the voice coil 19 is coupled also vibrates. At
this time, the dome portion 151a vibrates in the same direction as the voice coil 19 in the same
direction as the voice coil 19 because the flat portion 1 и b ? of the 4th part of the shell 1: 1ab
also has an opposite phase of vibration of the edge 18b. Can be completely prevented. In other
words, it is possible to completely stop the edge resonance, to obtain a very stable flat
characteristic in the sound pressure-frequency characteristic, and to extend the high region.
When a metal such as aluminum or a synthetic resin is used as the bobbin 20 of the voice coil
19, the formation of the stepped portion 20b and the small diameter @ 20a becomes a very good
item. As described above, the dome-shaped speaker according to the present invention can be
configured to have six rounds, and can be stabilized in terms of characteristics, and the voice coil
diameter can also be increased, and the reproduction band can be extended. By providing it on
the bobbin, the elliptical deformation of the voice coil is also eliminated, so that the stabilization
in terms of quality can also be measured, and so forth.
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