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2. Inventor Takaka Yamano '49 -D i river s 5 i ■ Japan Patent Office 0 JP 59-993, 14 '0
published Nissho 50. (1975) 8.7 Internal Code No. 乙 41) 555 @ Statement 1, Title 8 of the
Invention, Detailed Description of the Invention 1 The present invention is directed to the
directional characteristics of two dome diaphragms SS facing each other I'll do it one Kunizu) Kll.
・ ・ Speaker units generally involved in sound reproduction are preferred to have broad
directivity characteristics in order to effectively use the effect of reflected sound in the
reproduction sound field and to suppress the occurrence of distortion-% / The dome-shaped
speaker using the spherical diaphragm ll1IfNJ and the dome diaphragm has a wider directivity
characteristic and less generation of distortion of the waiting sound, compared to the cone and
horn speaker units. Most of the conventional speaker units are designed to emit sound to the
front only, and the rear-to-bottom has significantly degraded characteristics compared to the
front-side, or ^ to the rear-side. In order to obtain a good reproduction sound field by making the
generated sound wave close to a spherical wave generated from a point sound source so as to
obtain a non-directional or wide finger uniform speaker device In one cabiner nod Several
speaker units was in the manner to dispose with different radial direction of the sound from one
another. However, when a plurality of speaker units are provided in the same cabinet as
described above, there is a problem that the complex configuration must be taken into
consideration, such as mutual interference of sounds generated from each speaker unit. A
plurality of EndPage: The present invention has been made in view of the above-mentioned
circumstances, and it is simple to drive two dome diaphragms facing each other by a single
magnetic circuit common to them. To provide a speaker unit which has a non-directional
characteristic as a single IIIFlt and alone! It is intended for money. An embodiment of the present
invention will be described below with reference to the drawings. In FIG. 1, 11 is a nine ring
magnet with both ends #J magnetized to γt N そ and S pole, and inside this ring magnet 11, a
pole piece made of a cylindrical magnetic material 12 is supported by the #corrosion member I3
and is provided coaxially with this, and on the both-pole magnetic pole surfaces, a top plate in
which a plate made of a magnetic material is formed in a ring shape) 14A, 74B is n-PrLffim The
face is Kmll opposed so as to have an appropriate gap at both ends 5III 11i of the pole piece 120.
Thus, the magnetic circuit N1 is configured.
Each of the pole pieces 12 is formed in the shape of a ball-plane at each end of the pole piece 12.
Each convex surface is directed outward and each has an inner surface (two cylindrical
cylindrical voice coils). Two dome diaphragms JA and jB provided with 2B in a protruding state
are disposed in such a manner that the voice coil 21.2B is positioned in the above-mentioned
gap. These two dome diaphragms 3A,: tB are supported by the top plate 14 by means of a
support 4A # 4B, which has eight ridges appropriately so that it can vibrate in the axial direction
of the pole piece 12 Let □ In such a configuration, the magnetic flux generated from the ring
magnet 11 forms a magnetic path passing through the top plate 14A to the gap (air gap
magnetic flux path) to the pole piece 12 to the gap to the top plate 14B. The two voice coils
provided in the above-mentioned dome diaphragm JA, JB and positioned in the #i gap, Jl is given
a signal, the two voice coils are driven according to the signal n, the slave 2 The dome diaphragm
3 and 3B are driven. Therefore, +51 voltage is applied to 1 at both ends of each voice coil JA, Jl *
The polarity of the DC voltage when the distributed diaphragm JA, Jl is driven in the direction of
the arrow shown in the figure is the voice coil JA, JB both ends If the polarity of the signal is
negative, as shown in FIG. ■? The two ends of 2B are connected to the voice coil 2 so as to be
in series with-and in reverse with TL-. Then, the dome am plate 3 and Jll are driven in opposite
phase to each other, and therefore, they emit waves in the same phase in the direction different
from each other by 180 °. Do. Here's another one! Since the sound wave is emitted by I [JA, JB,
the special pointing characteristic, the sound wave weep generated from these two dome
diaphragms JA, JIl has a uniform sound in the direction of almost nave. It is possible to obtain
pressure or non-directional characteristics. The hollow portion of the pole piece 12
communicates the inner space of each dome am plate 3 and 3M, and this portion is made to act
on each dome diaphragm 3 as a pack cavity common to -5 BK. The present invention is not
limited only to the actual example described above and shown in the drawings, but the gist of the
present invention can be modified in various ways without departing from the scope of the
invention. Connect two voice coils, 711 to the input terminal IP +, IP-, in a row of 311 with
opposite polarity to the tile to make two dome diaphragms 3 and JB breathe. For example, as
shown in FIG. 2 (b), they may be connected in reverse polarity and in parallel.
As described above, according to the present invention, two dome diaphragms opposed to each
other are driven by a common -m magnetic circuit, thereby providing a non-directional
characteristic with a simple configuration and a single unit. A speaker unit can be provided.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view showing the configuration of
an embodiment of the present invention, and FIG. 2 (a) is a connection diagram showing a
continuous relation of voice coils in the example 1. Is a connection diagram showing another
embodiment. 1・・・al! Circuit part, 2 tubes, 2B · · · ボ イ ス ー ボ イ ス ー * ー ジ, JA * JII ·
· · 振 1IIl board. EndPage: 2 pages r (1) (b) ° t-JP 50-99314 (3) "5, list of attached documents
EndPage: 3
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