JPH04234300

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DESCRIPTION JPH04234300
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
dual coil speaker capable of supplying acoustic signals from various signal sources to each of two
movable coils.
[0002]
BACKGROUND OF THE INVENTION Double coils of this type are known in the prior art.
[0003]
Only the design of the moving coil differs from that of the traditional known dynamic conical
speaker shown in the literature ("Funkschau", 1983, No. 7, p. 99, Fig. 1). The details of the latter
will be described later), the space available is very limited and applies mainly to situations where
acoustic signals from different signal sources have to be transmitted by a single diaphragm.
[0004]
In television technology, for example, in a given television transmission with stereo sound, the
bass signal coming from the right and left sound channels is reproduced by a dual coil speaker Is
normal.
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For this purpose, the moving coil support of the double coil speaker comprises two coiled
windings.
Each turn of the first winding has a turn of the other winding in its vicinity. When the windings
are arranged as a plurality of layers around the coil support, this does not change the abovementioned arrangement of the windings of the windings relative to one another in each layer.
The arrangement is such that the turns of one lower layer winding are always covered by the
turns of another upper layer winding. The turns of the entire winding usually have the same wire
cross section.
[0005]
This known arrangement makes it possible to obtain good reproduction of the two acoustic
signals, as always in the same frequency spectrum. According to the inventor's point of view, this
corresponds to or instead of the thickness of the pole plate adjacent to these two windings for
the frequency spectrum to be transmitted of the conductor effective length of the two windings.
Based on the fact that the thickness of the pole plate matches the effective conductor length. In
this context, the term "conductor effective length" should be understood as the axial length of the
length of the winding of the moving coil support parallel to the central axis (or longitudinal axis)
of the loudspeaker. With this description, when acoustic signals of different frequency spectrums
are supplied to the two windings of a dual coil speaker, the acoustic reproduction quality of the
dual coil speaker is not nearly as good as the quality of a single coil speaker, almost self
explanatory become. Known winding designs where adjacent windings form parts of different
windings are properly designed for the particular frequency spectrum to which the effective
conductor length of only one of the two windings is to be transmitted There is an effect that is
possible. However, even the proper conductor effective length of the winding does not guarantee
a good sound reproduction effect. This is due to the fact that in the known winding arrangement
on the coil support, the improper winding gives rise to a higher ballast weight in a suitable
winding than in the case of a single coil speaker.
[0006]
Thus, the invention is based on the problem of providing a dual coiled speaker of improved
sound reproduction quality when sound signals of different frequency spectrum are supplied to
the two windings.
[0007]
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SUMMARY OF THE INVENTION This problem is achieved by arranging a first winding to be
wound as one or more layers on the outer surface of the moving coil support, of the first winding.
A second winding is disposed on a portion of the outer surface, the position of which is
preferably located in an area adjacent to the first pole plate when the system is in its rest
position, the first winding The solution is achieved by reducing both the longitudinal and
transverse lengths of the second winding in comparison to the longitudinal and transverse
lengths, respectively.
[0008]
Given the fact that the two windings of the coil support are arranged one on top of the other,
matching the effective length of each of the two windings to a particular frequency spectrum to
be transmitted, and It makes it possible to select the impedance of each coil so that it has nothing
to do with the other coils.
[0009]
Advantageous embodiments of the invention are described in the second claim.
According to this, the first winding is designed for the reproduction of bass and broad spectrum,
the second winding is designed only for the reproduction of speech, which effectively gives the
small amplitudes necessary for speech reproduction And the second winding can be held very
narrow.
Since the narrowness of the second layer also allows the use of a wire with a very small cross
section, the effective conductor length of this part of the winding is also optimized.
Furthermore, due to the reduction of the geometrical dimensions of the second winding intended
for speech reproduction and the resulting light weight, a little to the tones (sounds) of the bass
and the broadband spectrum obtained by the first winding. It has no effect. In particular, the
sound reproduction quality of the bass and the broadband spectrum is comparable to the
reproduction quality of a single coil speaker, and the sound reproduction quality of speech
reproduction obtains the optimum conditions that can only be obtained with a double coil
speaker.
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[0010]
It is particularly advantageous to use a double coil as claimed in claim 2 of a motor vehicle
equipped with a simultaneous two-way speech transmission device by means of an on-board
telephone device. Because, the dual coil speaker according to the present invention, the first
winding acts as a speaker for the audio system of the car, and the second winding acts as a
speaker for the speech reproduction of the simultaneous two-way speech telephone It can be
used to When used in this manner, traditionally audio-mounted conical speakers also do not
require the switching devices necessary to perform the speech reproduction function of the
telephone.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A dual coil speaker of the
traditional design shown in FIG. 1 includes a similar conical frame 10 supporting a conical
diaphragm 11. The vibrating membrane 11 and the frame 10 are joined together at each end on
the side having a large diameter. The small diameter end of the vibrating membrane 11 is
covered by a hemispherical dust protection cap 12 which is convex towards the inside of the
cone of the vibrating membrane 11.
[0012]
At the small diameter end of the frame 10, there is arranged an annular permanent magnet 13
which is arranged coaxially with the axis of the loudspeaker cone. However, the end of the frame
10 and the permanent magnet 13 are likewise separated by a pole plate 14 which is annular in
shape but has an inner diameter slightly smaller than that of the permanent magnet 13. The
other annular surface of the permanent magnet 13, i.e. the surface opposite to the frame 10, is
covered by a second disk-shaped pole plate 15.
[0013]
The pole core 16 supported on the surface of the pole plate 15 facing the frame 10 and coaxially
installed with the axis of the speaker is surrounded by the permanent magnet 13 and the first
pole plate 14 over the entire length thereof. Both are coaxial and maintain a constant distance
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from the pole core. A tube-like support 17 for the moving coil is provided at the end of the
diaphragm 11 with a small diameter. The movable coil support 17 has an inner diameter slightly
larger than the outer diameter of the magnetic pole core 16 and extends in the direction of the
magnetic pole core 16 and connects the magnetic pole core 16 with the permanent magnet 13
and the first pole plate 14. And surround the upper or free end of the pole core 16.
[0014]
An accordion-like designed centering film 18 is disposed between the inner surface of the frame
10 and the end of the coil support 17 facing the diaphragm 11, and during operation of the
loudspeaker, the coil support 17 Always guarantee to keep the center in relation to the
longitudinal axis of the speaker.
[0015]
Two coiled windings 20, 21 are disposed on the outer surface 19 of the coil support 17 in close
proximity to the first pole plate 14.
As illustrated by FIG. 1, each turn 22 of the first winding 20 is vertically adjacent to a turn 22 of
the other winding 21. This arrangement of mutually related windings 22 is also satisfied in the
horizontal direction when the windings 20, 21 are wound on the coil support 17 as shown in FIG.
Configure multiple layers. The cross section of the wire is the same for both windings 20 and 21.
When the loudspeaker is in the rest position, the arrangement of the two windings 20, 21 on the
coil support 17 is chosen such that the two windings are approximately centered relative to the
first pole plate 14. The ends 23 of the winding wire of each winding 20, 21 are led to terminal
clamps 24, 25.
[0016]
FIG. 2 shows a dual coil speaker according to the invention. It differs from the double coil
speaker shown in FIG. 1 in the different arrangements of the windings 20, 21 on the coil support
17.
[0017]
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As apparent from FIG. 2, the first winding 20 is wound on the outer surface of the coil support
17 in a plurality of layers. A second winding 21 is wound on this first winding 20 again as a
plurality of layers. Compared to the first winding 20, this second winding 21 is different because
the cross section of the wire is reduced and the width of the winding in the longitudinal direction,
ie along the surface of the coil support 17, is smaller . Furthermore, in the rest position of the
loudspeaker both windings 20, 21 are centered near the first pole plate 14.
[0018]
In the multilayer structure of the two windings 20, 21 on the coil support 17, it is not difficult to
adapt the conductor effective length of each winding 20, 21 to the frequency spectrum to be
transmitted. Assuming that the second winding 21 is lightweight, it has little or no effect on the
reproduction quality of another winding 20 designed for a different frequency spectrum when it
is used for speech reproduction.
[0019]
Brief description of the drawings
[0020]
1 is a cross-sectional view of a dynamic conical speaker with dual coils of conventional design.
[0021]
2 is a cross-sectional view of a dynamic conical speaker with dual coils designed according to the
invention.
[0022]
Explanation of sign
[0023]
DESCRIPTION OF SYMBOLS 10 ... Frame, 11, 18 ... Vibrating film, 13 ... Permanent magnet, 14 ...
Magnetic pole plate, 16 ... Magnetic pole core, 17 ... Coil support body, 19 ... Outer surface, 20,
21 ... Winding.
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