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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
voice coil contacts in loudspeakers, in particular to high thermal power loudspeaker contacts.
2. Description of the Related Art Since loudspeaker drive systems have already been developed
and have been known for some time, their description can be minimized in this case. Conical
loudspeakers consist essentially of a magnet system, a conical diaphragm and a loudspeaker
frame. In most instances, the speaker frame is connected to the top plate of the magnet system.
The diaphragm is set in the speaker frame and its large diameter side is coupled to the upper end
of the speaker frame by a peripheral bead. A tubular voice coil support is disposed on the small
diameter portion of the diaphragm. A voice coil is wound around the outer shell of the voice coil
support. When the loudspeakers are mounted, the free end of the voice coil support not
connected to the diaphragm is in the air gap of the magnet system formed in the area by the
distance of reciprocation between the top plate and the pole core Inserted into The small
diameter portion of the voice coil or diaphragm is dish-like when viewed from above and
comprises a central position retaining membrane of accordion-shaped cross section, so that the
diaphragm is for example the free end of the voice coil support Can be maintained in its central
position on the loudspeaker axis during operation to prevent it from hitting the upper plate after
an upward stroke. The outer end of the centering membrane is connected to the speaker frame.
Generally, the centering membrane is formed from a resin-infused fabric mesh so as to provide
centerpoint holding capability on the one hand and not limit, or only proportionally, the stroke of
the diaphragm with respect to the height of the reciprocation on the other hand . The spring
properties of the centering membrane and the damping provided to the outer diaphragm limit
the flexibility of the vibrating diaphragm.
The voice coil contact is formed by placing on the speaker frame a contact block on which the socalled standard loudspeaker conductors reach the winding end of the voice coil. According to the
known solution, the standard type of speaker conductor can reach the end of the winding of the
voice coil by partial adhesion to the top or bottom of the diaphragm. Other solutions are known
in which the voice coil contact is formed through the pole core or a standard type loudspeaker
conductor is integrated in the centering membrane. However, regardless of whether it is actually
realized or not, this has the flexibility to follow the reciprocating motion of the diaphragm or
voice coil on the one hand without limit, and on the other hand caused by the reciprocating
motion regardless of their flexibility It requires a standard type of conductor that has long-term
resistance to conductor breakage under alternating bending stress. For that reason, standard
speaker conductors are formed from a wire mesh embedded around the plastic core. Cadmium is
added to the wire mesh material to enhance the material's alternating flexing ability.
In addition to the fact that cadmium is associated with environmental problems, it has the
disadvantage that the service life of the above loudspeakers at ambient temperatures above 80
° C. is very short. On the one hand, this is believed to be because the centering film loses the
above properties at these temperatures and the plastic core of the standard speaker conductor
ages. The latter first destroys the loudspeaker conductor, which breaks the contact between the
contact block and the voice coil. Accordingly, it is an object of the present invention to provide a
loudspeaker in which the voice coil contacts are not damaged at ambient temperatures up to 150
° C. under continuous use for a long period of time.
The object of the present invention is to position a rod on the pole core with a free end portion
and an end portion facing the pole core, each provided with a collar-like cap, the bushing along
the rod A helical spring, slidably mounted, attached to the diaphragm or voice coil support by the
adapter, formed of a conductive material, and slidable along the rod, is between the upper and
upper caps of the adapter and the adapter Located between the lower and lower cap, one end of
the voice coil winding forms an electrical contact with one of the springs under the adapter and
the other end of the winding with the spring above the adapter Contact, one of the leads from the
signal source is connected to the upper spring by the upper cap and the other lead is connected
to the lower spring by the lower cap Achieved by a loudspeaker according to symptoms. A voice
coil contact of this type makes it possible to connect the wire from the amplifier and the voice
coil winding without the need for the introduction cable to be braided. For this purpose, the voice
coil contact has a significant resistance to heat loads.
It is also particularly effective that the centrally located retaining film is removed in accordance
with the present invention. This eliminates the problems that conventionally occur with central
location films at temperatures above The use of the voice coil contact according to the
invention does not degrade the reproduction quality when the loudspeaker is used to reproduce
a deep reciprocating acoustic signal. Due to the extremely high heat resistance of the voice coil
contacts, loudspeakers configured in this way can also be operated at room temperature at high
temperature levels for a significantly long period of time. This structure has a special meaning in
the area of "active noise cancellation". This is because the loudspeakers are often located in areas
where the ambient temperature has risen to eliminate environmental noise. For example, the
arrangement of loudspeakers in the engine area or exhaust system of a motor vehicle.
If the wire passes through the opening in the pole core along the loudspeaker axis according to
claim 2, the smaller diameter of the diaphragm can be sealed with a dustproof cover. If the
loudspeaker frame is configured accordingly, the entire interior of the loudspeaker frame can be
separated from the area in which the loudspeaker diaphragm operates. This is particularly
important, for example, when loudspeakers are used in dusty areas. Furthermore, the diaphragm
surface and the dust protection cover can be protected, for example, by a suitable coating against
aggressive air or gas media.
A particularly simple type of spring contact is that, as indicated in claim 3, the cap, the adapter
and the bushing are made of an insulating material and have a disc of electrically conductive
material on the side facing the spring.
In this figure, only the top pole plate 11 and the pole core 12 of the loudspeaker magnet system
are shown. The pole plate 11 and the pole core 12 are disposed around the speaker shaft 13. The
air gap 14 of the magnet system is formed between the outside of the pole core 12 and the side
of the pole plate 11. The conical diaphragm 15 is located above the magnet system at a central
axis coincident with the loudspeaker axis. A peripheral bead (not shown) connects the large
diameter side of the diaphragm 15 to the upper end of the speaker frame. A tubular voice coil
support 16 is disposed and connected to the small diameter portion of the diaphragm 15. The
free end of the voice coil support 16 projects into the air gap 14. The voice coil 17 is wound on
the outside of the voice coil support 16. The rod 18 is arranged on the pole core 12 with a
central axis coinciding with the loudspeaker axis 13 in the direction of the diaphragm 15. The
rod 18 is inserted into the pole core 12 for coupling of this example construction. The protruding
length of the free end of the rod 18 is limited at the upper and lower ends facing the pole core
12 by the caps 19 O and 19 U forming a collar portion formed of an insulating material. In this
construction example, the bushing 20 which can move along the rod 18 is integrally formed with
the dished adapter 21. The outer periphery of the adapter 21 is connected to the inner container
of the voice coil support portion 16. Conductive disks 23 are located and coupled to the upper
and lower sides 22 O and 22 U of adapter 22. The caps 19 O and 19 U also have a disc 23 on the
side facing the adapter 21. One helical spring 24O and 24U, respectively formed from a
conductive material, between the disc 23 on the upper cap 19O and the disc 23 on the upper
side 22O of the adapter 21 and with the disc 23 on the lower cap 19U It is disposed between the
disks 23 on the lower side 22 U of the adapter 21. These springs 24 having the same length,
thickness and pitch to hold the balancing requirements, and between the disc 23 on both sides of
the adapter 21 and the disc 23 coupled to the caps 19 O and 19 U Located in contact.
The two winding ends 25 of the voice coil 17 reach the disc 23 arranged on the adapter 21,
wherein one winding end 25 is electrically connected to the disc 23 on the upper side 22 O of
the adapter 21, The other winding end 25 is electrically connected to the disk 23 on the lower
side 22 U of the adapter 21.
Two leads 26 from the signal source pass through the bell openings of the diaphragm 15 to the
disc 23 on the caps 19 O and 19 U, one lead 26 being electrically connected to the disc 23 on
the cap 19 O, The lead wire is electrically connected to the cap 19U.
The adapter 21 has a corresponding opening through which the lead 26 passes so that the
movement of the voice coil 17 or the diaphragm 15 is not impaired by the lead 26 leading to the
disc 23 of the lower cap 19U.
When an acoustic signal comes in through the lead 26 and thereby causes a reciprocation in the
voice coil 17, the contact of the voice coil is made because the contact is made by a spring which
is designed for reciprocation and thus is not easily broken It is apparent that there is no need for
braided conductors or conductors 26 exposed to alternating bending stresses. Tests have shown
that this type of voice coil contact has a significantly longer service life under full load and an
ambient temperature of 150 ° C.
Since the bushing 20 and the rod 18 ensure that the system is centrally located, the problems
otherwise associated with centering membranes in this temperature range are also solved.
Since the example structure shown in FIG. 2 mostly corresponds to the example structure of FIG.
1, the reference numerals of the elements used in FIG. 2 have already been described in
connection with FIG.
In FIG. 2, the point which has the conducting wire 26 which passed through the opening 27 in
the pole core 12 differs from that of FIG. The guiding of this type of conductor 26 to each disc 23
makes it possible to seal the smaller diameter of the diaphragm 15 by means of a dustproof
cover 28. The entire drive system 10 can be sealed in this way. This is effective when the
diaphragm 15 is operated in a dusty area.
The dust cover 28 can also seal the smaller diameter portion of the diaphragm 15 in FIG.
However, this means that if the lead 26 must pass through the dust protection cover 28 and the
passage is dust-proof, the opening in the dust protection cover 28 is likely to wear along the lead
26 during operation It has the disadvantage of On the other hand, the latter is likely to prevent
the reciprocating motion of the diaphragm 15, and the dust-proof state does not continue.
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