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JPH11205894

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DESCRIPTION JPH11205894
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
acoustic speakers, and more particularly to a speaker having a cone with radially extending and
arc-shaped segments formed from a polycarbonate based plastic. Thus, the present invention
relates to the search for constant wave velocity generation for exact sound reproduction, utilizing
a three-dimensionally defined cone made of a specific plastic material.
[0002]
BACKGROUND OF THE INVENTION The function of the cone in a speaker is well known, and
coils radiate sound waves radially across the speaker cone, which is typically made of a material
that can vibrate when properly positioned It is recognized that it occurs. The corn was originally
so named because of the somewhat "conical" structure. Early speaker designs are exemplified by
LaRue, US Patent No. 1787946, where a suspended diaphragm is used. However, conventional
acoustic speakers included a diaphragm of the basic conical design described above, which
radiates outward around the coil. By subsequent refinement, acoustic diaphragms were
considered, for example, having honeycomb cones of a plurality of laminated metal foils and with
adjacent metal foils attached at a regular pitch.
[0003]
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U.S. Pat. No. 4,300,655 to Sakamoto et al. Describes an acoustic diaphragm manufactured from a
cone member of elongated web material bent so that a plurality of radial projections are
sandwiched between upper and lower flat components. The invention shows that increased
speaker power is achieved by model line reshaping. Although this patent relates to the
generation of radial sound waves, it does not relate to a system of the type provided by the
present invention, that is, in the present invention, the speed of constant sound flattens as the
radial distance increases. It is sought at high frequency using bow-shaped speaker segments that
have a tendency to Alexander Faraone U.S. Pat. No. 4,881,617 describes an acoustic speaker
having a cone located near the transducer, where the cone has a plurality of thin pie-like
segments radiating outward from the transducer, Each of the segments has an arcuate crosssection thereby resulting in concave and convex sides. Although the above-mentioned patent of
Alexander Faraone, the inventor of the present invention, relates to a cone having a structure
which is concave towards the center, the high-frequency central cone of the present invention
has other unique and non-obvious features which are Including being convex towards its center,
located in different ways near the voice coil support tube and uniformly structured.
Notwithstanding the prior art, the present invention is neither taught nor revealed by them.
[0004]
SUMMARY OF THE INVENTION The present invention relates to an improved acoustic speaker
cone having a plurality of thin pie-like segments radiating outward from their centers, each of the
segments having an arcuate cross-section. Uniquely, these cones are manufactured from
polycarbonate plastic and are convex towards the center for the high frequency cone or concave
towards the center for the larger broad range cone Take a form. The segments are very concave
towards the center of the cone and become smaller and smaller as the radial distance away from
the center of the cone increases. The width of the segments increases linearly with the radial
distance to produce a constant acoustic resistance in the radial direction. In another aspect, the
invention relates to a system comprising both the above-described high frequency cone and an
outer wide range cone having similar radial features. The segments of the outer cone preferably
end with a flexible, high sound absorbing ring. The central cone is mounted in the central orifice
at the center of the outer cone. A polycarbonate cone of polycarbonate film has a specific gravity
of about 1.10 to about 1.40, an electrical dissipation factor of about 0.05 to about 0.30 at 60
hertz, and about 1. about 10 @ 6 hertz. It has an electrical dissipation factor of 00 to about 1.25,
and further has a thermal conductivity of at least 1.2 BTU / hr / ft 2 / ° F / in. Also, the
polycarbonate has a softening point, for example above 270 ° F., in particular above 300 ° F.,
measured as Vicat softening temperature (ASTM D 1525). As mentioned above, the inventor has
obtained US Pat. No. 4,881,617, which describes a unique acoustic speaker utilizing a threedimensionally defined radially arcuate cone.
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[0005]
The present invention comprises substantial improvements over the prior art loudspeaker of US
Pat. No. 4,881,617. It is then recognized that the central cone must be formed uniformly by the
reverse structure (convex towards the center instead of concave towards the center) without
replacing the material at the center Because it was not done. The Faraone patent describes the
possibility of a central cone as a diaphragm, dust cover or cone with a similar design to the main
cone, with a small piece of sound absorbing material as the end, but it is It does not recognize the
need for a uniformly structured center cone of one stable material of construction to increase
high quality sound generation. In other words, the central cone of the present invention lacks all
the filling substitutes, buffers or other materials and uniquely generates high frequencies. In fact,
the inventors have manufactured cones manufactured from metal foils with a central hole having
foam pads therein, corresponding to column 25, line 25-37 of US Pat. No. 4,881,617, and further
development After a few years, this central corn produced according to the inventor's earlier
patent was significantly inferior to the central corn of the present invention. The former central
cone produced some undesirable resonances and could not generate 20000 cycle hertz, but the
high frequency central cone of the present invention was unexpectedly able to overcome both of
these difficulties. Also, on the basic principle of speaker cone construction that the center cone
and the wide range cone of the previous US Patent No. 4,881,617 are substantially improved,
cheaper to manufacture, and can be formed from polycarbonate based plastics. Things that were
contrary were not found for quite some time and until very recently.
[0006]
The high frequency center cone of the present invention can be used alone or with other
speakers by being mounted in the center orifice of the other speaker structure. Similarly, a wide
range of larger cones can be used alone by mounting near the coil support. In one preferred
embodiment, the high frequency center cone of the present invention is combined with the larger
wide range cone of the present invention (outside cone) to obtain a high quality, very wide range
acoustic speaker.
[0007]
With respect to FIGS. 1 and 2, front and side views, respectively, of a high frequency center cone
1 according to the invention are shown. Center cone 1 is formed from a clear polycarbonate
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plastic known as Lexan® film 8010 and manufactured by General Electric Company, Pittsfield,
MA (Lexan is a registered trademark of General Electric Company). The central cone 1 comprises
a portion 3 of the front surface which is substantially convex towards its center (in other words,
its outermost projecting surface away from the speaker coil or transducer will be at its center). At
the outer edge 5 of the front part 3 there is a tubular wall 7 which maintains the base of the
circumference of the support relative to the front part 3 and an acoustic speaker system, for
example a tubular support and / or an outer Increase attachment of center cone 1 to other
components of the speaker. The individual segments, for example segments 9, 11 and 13, are
pie-shaped segments radiating outward from the center 15 of the cone 1. All of these segments
have an arcuate cross-section as clearly illustrated in FIG. 2, thereby giving rise to convex and
concave sides for each respective segment. All of the concave sides face in one direction, and all
of the convex sides of the segment face in the opposite direction. In addition, all of the arcuate
segments have a very concave cross section towards the center 15 of the cone and furthermore
become smaller concave cross sections as the radial distance away from the center 15 increases.
Also, as can be seen, the cone 1 itself is convex towards its center 15, ie it protrudes outwardly
away from its wall 7.
[0008]
FIG. 3 shows a side view of the central cone of the present invention attached to the inside or the
outside of the tubular support for the speaker coil. In both FIGS. 3 and 4, the central cone 1 is
attached to the tubular support of the speaker coil. In FIG. 3 the central cone 1 is inserted inside
the tubular support 21 by the wall 7 of the cone 1 attached to the inside of the wall 23 of the
tubular support 21. An optional stop, for example the stop 25, can be used to position the central
cone 21 at a sufficient depth of the wall 7. It is also held in place by the adhesive and / or the
mechanical construction of the speaker cabinet or box.
[0009]
Separately, in FIG. 4 the cone 1 is attached to the outside of the tubular support 31. In this case,
the tubular support 31 is attached to the inner wall 7 with an arcuate end with the extension
portions 33, 35, 37 etc., and the wall portion where the individual segments of the central cone 1
end Engage with. This will maximize the transmission of sound waves from the tubular support
31 to the central cone 1.
[0010]
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FIG. 5 shows a front view of a loudspeaker device according to the invention utilizing the central
cone 1 as well as the outer cone 41. With regard to the outer cone 41, it is necessary to refer to
both FIGS. FIG. 6 shows a cutaway side view of the outer cone 41 of the present invention, which
can be used alone or in conjunction with a central cone. FIG. 5 shows a central cone located
inside the tubular support 21 of the speaker coil, as well as an outer cone 41 located outside the
tubular support 21. In this embodiment, the outer cone 41 has individual segments uniformly
divided at 20 ° each and thus has a total of 18 segments. Similarly, central cone 1 has 18
similar segments. The outer cone 41 has segments with an arched cross-section, thereby giving a
concave side and a convex side to each of these segments, all said concave sides of those
segments being one Face in the direction, and all of the said convex sides of those segments face
in the opposite direction. Furthermore, these arcuate segments, for example segments 43, 45 and
47, have sections which are very concave towards the center, and a cross section which
decreases away from the center as the radial distance increases. This is particularly evident when
looking at segments 51 and 53 of the outer cone 41 shown in FIG.
[0011]
The central cone 1 is convex towards its center as shown in FIG. 2, while the outer cone 41 is
concave towards its center as shown in FIG. The cone 41 projects rearward towards its center.
Furthermore, the outer cone 41 has an optional high sound absorbing suspension ring to further
move the outer cone 41 and thereby increase performance. Attachment to the frame can be
accomplished by screws through an orifice such as orifice 27. Importantly, note that the outer
cone 41 has a central orifice 29 and an inner side wall 55 (FIG. 6). In this particular aspect, the
outer cone 41 is manufactured from the same material as the inner cone 1. FIG. 7 shows a side
cutaway view of the combined acoustic speaker shown in FIG. (Same parts have been given the
same numbers throughout the figures. )
[0012]
The cone of the present invention is manufactured from polycarbonate plastic. Polycarbonate is a
well-known product defined as a thermoplastic linear polyester of carbonic acid. These materials
are commercially available and well known to those skilled in the plastic art. The inventor has for
many years attempted to use various plastics that would function properly for the speaker cone,
utilizing the inventor's radially arcuate segment cones. The requirements included proper
acoustics, i.e. sound wave propagation, proper flexibility and stiffness, proper density and
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acceptable heat dissipation. Originally, a wide range of speakers were constructed of aluminum
foil, and it was recognized that plastic was used in situ to reduce cost and eliminate conductivity.
Although various plastics have been tested, none will reach the results of the aluminum foil, and
none will outperform the aluminum, until recent unexpected results are achieved with
polycarbonate of selected nature. I thought it was.
[0013]
Thus, the present invention relates to a polycarbonate cone of the above mentioned arcuate
segment configuration, in which case the resulting formed cone of polycarbonate has a specific
gravity of about 1.10 to about 1.40 and is about 60 Hz. It has an electrical dissipation factor of
0.05 to about 0.30, and an electrical dissipation factor of about 1.00 to about 1.25 at 106 hertz,
and further at least 1.2 BTU / hr / ft2 / ° F / in Have a thermal conductivity of The following
examples are representative of the corn of the present invention.
[0014]
EXAMPLES Example 1 A high frequency center cone was constructed according to FIGS. 1 and 2
above utilizing a commercial product of polycarbonate containing a flame retardant. Its
performance was superior to similar aluminum foil devices and all other plastics tested. It has the
following characteristics:
[0015]
EXAMPLE 2 The cones shown in FIGS. 1 and 2 which are manufactured from polycarbonate
without flame retardants have the following characteristics:
[0016]
These cones of Examples 2 and 3 also outperformed cones made of aluminum foil and other
plastics containing polyvinyl chloride and polyester tested.
Polyethylene and polypropylene can not adequately dissipate the heat. Some plastics used for
base speakers can not transmit full range sound waves. Clearly, numerous modifications and
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variations of the present invention are possible in light of the above teachings. As such, within
the scope of the claims, the present invention may be practiced otherwise than as specifically
described herein.
[0017]
Brief description of the drawings
[0018]
1 is a front view of one preferred embodiment of the high frequency central cone of the present
invention.
[0019]
2 is a side view of one preferred embodiment of the high frequency central cone of the present
invention.
[0020]
FIG. 3 is a side view of a central cone of the present invention attached to the inside of a tubular
support for a speaker coil.
[0021]
FIG. 4 is a side view of the central cone of the present invention attached to the outside of the
tubular support for the speaker coil.
[0022]
5 shows a front view of the inventive speaker device utilizing both a central cone and an outer
cone.
[0023]
6 shows a side cut view of the inventive wide range cone shown in FIG.
[0024]
FIG. 7 is a side cut-away view of the acoustic speaker of the present invention including a center
cone and an outer cone.
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[0025]
Explanation of sign
[0026]
DESCRIPTION OF SYMBOLS 1 center cone 3 front edge portion 5 3 outer edge 7 tubular wall 9
segment 11 segment 13 segment 15 1 center 21 tubular support 23 21 wall 25 stop 27 orifice
29 central orifice 31 tubular support 33 extension 35 extensions 37 extensions 41 outer cones
43 arcuate segments 45 arcuate segments 47 arcuate segments 49 segments of high acoustic
absorption suspension ring 51 41 segments 55 of the inner wall 55
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