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JP2006187040

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DESCRIPTION JP2006187040
An improved stereo-electro-acoustic conversion system is provided. A high frequency assembly
(12L, 12R) for emitting acoustic energy having spectral components in an audio frequency range
higher than a predetermined high frequency, the assembly comprising the height and width of
the enclosure (11) And an enclosure with a port that encloses a loudspeaker driver having a cone
adjacent to the front surface slightly smaller in diameter than at least one of the at least one. The
driver has a pot-shaped magnetic structure formed by an annular extension, the annular
extension having an air space between the end of the extension and the portion of the pot
adjacent to the voice coil. Reduce the magnetic flux in the vicinity of the ridges.
Satellite type compact electroacoustic conversion
[0001]
The present invention relates generally to satellite (satellite) type electro-acoustic conversion,
and more particularly, using a non-localizable bus enclosure disclosed in US Pat. No. 5,092,424
(incorporated herein) and the like. By regenerating the high frequency range, which extends
beyond the upper frequency of the bus frequency, typically in the range of 150 to 200 Hz, using
a very small satellite-type enclosure. The present invention relates to novel apparatus and
techniques for reproducing substantially the full range of audio frequencies.
[0002]
RELATED APPLICATIONS The US application corresponding to this application is a continuation
of US patent application Ser. No. 08 / 443,625, filed May 18, 1995.
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[0003]
For background, reference is made to U.S. Pat. No. 4,932,060 entitled "Stereo Electroacoustic
Transformation", issued Jun. 5, 1990.
This US patent is incorporated herein by reference.
An important object of the present invention is to provide an improved stereo electroacoustic
transducing system.
[0004]
According to the invention, a bus enclosure emitting acoustic energy having spectral components
in a bus frequency range up to a predetermined high frequency, typically in the range of 150 to
200 Hz, and above the predetermined high frequency And at least one high frequency driver in a
very small enclosure that emits spectral components in the audio frequency range of In a stereo
system, these high frequency radiation assemblies are at least left and right. Preferably, these
high frequency assemblies are present as a pair that is displaceable relative to at least the right
and left adjacent and common axes. Each assembly includes a driver in its front panel adjacent to
the enclosure, which has a diameter of a cone or diaphragm slightly smaller than its own width
and / or height. The diameter of the driver's voice coil is comparable to or larger than the radius
of the diaphragm. The cross sectional area of the enclosure substantially corresponds to the
cross sectional area of the front panel for most enclosure lengths. The enclosure has a port. The
driver typically has an efficiency β of at least 1.6 Newton <2> / watt, expressed as the ratio of
mechanical force generation to heat loss that occurred during the generation of that force, which
It is known in the art and is fully described in column 6 of US Pat. No. 5,216,723 entitled
"Permanent Magnet Transducing". The high frequency assembly is substantially all audio
frequency range higher than the predetermined high frequency without audible distortion, as
conventionally measured 1 meter from the driver on the driver axis in an anechoic environment
Over and over, it is constructed and arranged to provide a predetermined maximum sound level
of at least 90, preferably 99 or 105 dB.
[0005]
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When high frequency assembly or satellites (satellites) and a non-localizable (localized) bus
enclosure are located in a typical viewing room, localization occurs only on the satellites. That is,
the viewer may not be able to localize the bus that may be hidden and radiated by a nonlocalizable bus enclosure that is unhindered and any port having an opening in the outer wall of
the bus enclosure. Despite the perception of spectral components, all sounds are perceived as
coming from satellites. Typically, the distance between each satellite and the non-localizable bus
enclosure is less than 10 meters.
[0006]
According to another feature of the present invention, it is configured to interconnect the small
gauge wire leads from the driver inside the enclosure to the larger gauge wire outside that of the
enclosure that connects the driver to the amplifier. There is a two terminal connector located at
the rear.
[0007]
According to yet another feature of the invention, the rear of the enclosure forms an acoustical
impedance between the driver and the input to the main port and has a spectrum higher than a
predetermined intermediate frequency, typically on the order of 800 Hz. It is configured and
arranged to suppress transmission of the components.
[0008]
Many other features, objects, and advantages of the present invention will become apparent from
the following detailed description read in conjunction with the accompanying drawings.
[0009]
Referring now to the drawings, and in particular to FIG. 1, an illustration of the logical
arrangement of the system according to the invention is shown.
The bus enclosure 11 receives the left and right stereo input signals at the input terminals 11LI
and 11RI, respectively, and predetermined high frequencies at the satellite output terminals 11LS
and 11RS connected to the left and right upper frequency assemblies 12L and 12R, respectively.
Provides left and right high frequency range signals having spectral components higher than
frequency.
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[0010]
Referring to FIG. 2, a general view of the high frequency assembly according to the invention is
shown with the upper enclosure 12A pivotally connected to the lower enclosure 12B.
[0011]
Referring to FIG. 3, an elevation view including a partial diametrical cross-sectional view of an
embodiment of a driver according to the present invention is shown.
The driver includes a cone 21, a magnet 22, a central pole piece 23, and a pot 24.
An air gap 26 between the central pole portion 23 and the flange 24 A of the pot 24 provides a
voice coil 27.
The pot 24 is formed with an end portion 33 connected to a basket 28 which functions to
substantially limit the magnetic flux to the interior of the enclosure. That is, the pot 24 is a
magnetic structure formed by using the annular extension 24A, and there is an air space between
the end of this extension and the portion adjacent to the voice coil 27 of the pot, and the
periphery Reduce the magnetic flux of The voice coil lead out is not attached to the bottom of the
cone 21 but is connected to the terminals. One of the terminals 30 is shown in FIG. 3 and the
other extends diametrically opposite and substantially parallel to the driver axis, neither being in
contact with the cone 21. The effect of not contacting the voice coil lead-out cone is that the
mass of the cone is reduced compared to the same cone with the voice coil lead-out attached to
the surface of the cone, thereby reducing the high frequency response of the driver. The point is
to help improve. Another effect is that the asymmetric mass loading that occurs when the lead
out adheres to the cone is eliminated.
[0012]
FIG. 5A shows contours of the magnitude of the magnetic flux density for a conventional pot, and
FIG. 5B shows the case for a pot having an end portion 33. The surround 32 and the spider 31
provide dual suspension points which allow axial movement of the cone 21 and the voice coil 27
without lateral movement. The moving assembly of the driver has two flexible members,
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surround 32 and spider 31, at different axial positions. The transfer assembly is mounted on a
rigid subassembly best shown in FIG. 3 with the basket 28 separated from the magnetic structure
consisting of the pot 24, the magnet 22 and the central pole portion 23. Advantageously, the
transfer assembly is placed on a rigid subassembly to form a subcombination, and then the
subcombination and the magnetic structure are bonded together to form a driver. The spider 31
correspondingly has a relatively high ratio of outer diameter to inner diameter, and with only two
rotations, sufficient compliance to obtain adequate displacement of the voice coil 27 in the
ported enclosure give. The magnet 22 is made of a magnetic material based on neodymium-iron
boron or other rare earths.
[0013]
The air mass in the hole 34 of the basket 28 and the hole of the voice coil bobbin 35 resonates
with the volume of the air under the dust cap 36 and the volume of the air 37 under the cone 21
and is undesirable. Give resonance. Referring to FIG. 6, the influence of these resonances on the
frequency response of the cone output and main port output of a high frequency assembly
without an impedance element between the diaphragm and the main port outlet is shown There
is. The thick line is the frequency response of the output of the main port in an adjacent magnetic
field, and the thin line is the magnetic field output relatively near the loudspeaker cone. Below
about 800 Hz, the main port functions as a lumped element device to provide the desired output
between about 130 Hz and 400 Hz to the system. Above about 800 Hz, between about 1300 Hz
and 2600 Hz there is an unwanted resonance mode that is greater than or equal to the output of
the cone. The overall average frequency response of the system as used in a room where the two
largest peaks due to the main port guided mode occur in the frequency band of about 1000 Hz
to about 3000 Hz is shown in FIG. It is done.
[0014]
Referring to FIG. 9, the acoustic impedance between the cone and the main port in the form of an
intermediate port is illustrated. In the enclosure 43, the main volume consists of subchambers
41, 42 between the output port 45 and the driver 44 divided into subchambers by a sealed baffle
47. The front sub-chamber 41 is between the driver 44 and the baffle 47. The rear sub-chamber
42 is between the baffle 47 and the output port 45. These two subchambers 41, 42 have their
own lamp element resonances, typically at least one octave above the lamp element resonances,
and at least one octave below the transmission line resonance frequency of the main port It is
connected by an intermediate port 46 in a baffle that is otherwise sealed as tuned. Below this
mid-port tuning frequency, the mid-port 46 is effectively open and the main port operates
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normally as an acoustic mass. Above this mid-port tuning frequency, the mid-port 46 is
effectively closed, sealing the main output port 45 from the driver so that the effective volume
behind the driver is the same as the subchamber 41. The sealing effect prevents the driver from
exciting the transmission line resonance of the main output port 45. The intermediate port
tuning frequency is preferably one octave higher than the system resonance, and at the
frequency at which the intermediate port 46 effectively closes, the mechanical impedance
provided to the driver motor is controlled by the moving mass of the driver instead of the
effective volume. The efficiency of the system is not affected when the effective volume behind H
changes from the sum of the volumes of subchambers 41, 42 to only the volume of front
subchamber 41.
[0015]
At high signal levels close to the mid-port tuning frequency, the transmission line mode of the
main output port 45 is still due to air turbulence at the mid port 46 with spectral components at
the half-wave frequency of the main output port 45 Excited by noise. Such excitation can be
prevented by constructing the intermediate port 46 and the baffle 47 of a semi-rigid semibreathable (porous) material.
[0016]
Referring to FIG. 10, a cross-sectional view of a high frequency assembly enclosure showing a
semi-rigid foam intermediate port configuration 48 is shown. This structure forms an internal
baffle 47 which can be partially passed (penetrated) but resists air flow. As a result, a portion of
the air flow between the front subchamber 41 and the back subchamber 42 bypasses the
intermediate port 46 to reduce the flow velocity inside the internal port 46. The porous baffle 47
also functions as an energy consuming acoustic filter. Because this material is flexible and lossy,
some energy is dissipated through mechanical damping as the device vibrates in response to
acoustic pressure. Properties such as flow resistance, acoustic resistance, etc. of this material
control the fraction of the volume velocity flowing through the aperture. If the material is too
open, the intermediate port 46 will not be effective, while if the material is too closed the
intermediate port will be disturbed. A preferred form of this material is 70 lbs / linear inch, 2 lb /
cu., Commercially available from Foamex under the trademark Pyrell. It is a polyester
polyurethane foam with a density of ft. Other porous materials also provide acceptable
properties. This structure is a foam material that is easy to insert, pre-cut, compatible pieces,
which also give the desired acoustic damping and isothermal properties.
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[0017]
The illustrated portion 48 functions as an intermediate port 46 and a baffle 47 to provide
acoustical attenuation using an isothermal material made of reticulated foam. This foam
combines the acoustic resistance and isothermal properties typically provided by the acoustic
padding with a material having the porosity, flexibility and mechanical loss properties of the
intermediate port 46 and the baffle 47. Furthermore, the shape and dimensions are such that the
flat front face is flush with the port wall and forms an internal baffle 47 when properly placed in
the enclosure. The slightly oversized size of the foam and the moderate flexibility provide the
desired acoustical seal around the continuous peripheral edge of the baffle 47. An intermediate
port 46 is formed by the rectangular portion cut along the middle of the foam and the flat
surface of the enclosure placed against it. The remaining surface of this section is contoured to
fill most of the rear sub-chamber 42 to lower the desired volume of air in front of the main
output port 45 and behind the driver at low frequency. To be acceptable. By selecting properties
that facilitate isothermal cycling, the bulk of the material typically increases the effective acoustic
volume.
[0018]
Referring to FIG. 8, the average frequency response in a high frequency driver room with the
structure of FIG. 10 is shown, showing the absence of unwanted resonances between 1000 Hz
and 3000 Hz.
[0019]
Another feature of the present invention that facilitates acquisition of the desired sound emission
characteristics using a small enclosure size is a feed through connector that provides external to
enclosure connection to one or both drivers.
The external cables interconnecting each high frequency assembly to the bus enclosure
preferably have a low impedance as compared to the drivers in the enclosure. In the illustrated
embodiment, a 20 foot long cable having a keyed plug molded on at each end terminates at a
0.6725 inch diameter female plug having a connector. Used for this interconnection with the 18
gauge wire used, a 0.045 × 0.045 inch <2> pin is brought into contact on a 0.156 inch pitch.
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[0020]
The connection between the driver in the enclosure and the feed through connector is made
using a much smaller and more flexible cable, which is only a few inches long and It is because
the impedance has no meaning compared to the driver. These wires may conveniently be
terminated in small standard connectors such as separable crimps. This connector connects to
the pins of the 0.025 × 0.025 inch <2> connector on a 0.098 inch pitch. The feed through
connectors in the enclosure provide an air tight connection between the outer and inner plugs
with pins of different cross sectional area separated by different pitches. This feature of the
invention forms each feed through as a single item of varying cross sectional area and bending,
whereby each end of the plug when molded in the carrier by the second pin The desired pitch is
obtained in the part. This is illustrated in cross section in the general view of FIG. 11A, in plan
view in FIG. 11B, and in section C-C in FIG. 11B in the cross sectional view of FIG. 11C.
[0021]
Referring to FIG. 12, a general view of an effective arrangement for connecting the leadout wire
to the end of the voice coil is shown. The voice coil 27 includes a formation 27F and a singlestrand voice coil wire winding 27W terminating at a crimp 27C. The formation 27F includes a
conductive anchor pad 27P to which both the crimp 27C and the end of the bundle of lead-out
wires 58 are soldered. FIG. 13 shows an enlarged view of crimp 27C attached to the end of
winding 27W. The crimp 27C is typically tin plated on copper plated onto a brass preform, and
the voice coil winding wire 27W is typically a single strand # 30. AWG or smaller. FIG. 13 shows
typical dimensions in inches.
[0022]
Referring to FIGS. 14A, 14 B and 14 C, anodized (anodized) aluminum wire, insulated copper wire
and insulated copper clad aluminum wire are shown respectively. There is.
[0023]
This feature of the invention has a number of advantages.
The invention enables rapid and repeatable electrical and mechanical termination of one or more
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voice coil wires, in particular the space for such termination is as extreme as in the driver of the
invention. Useful when limited. By using a very small crimp to form the connection of the power
supply to the voice coil, a single strand of thin gauge magnet wire or aluminum wire can be
trapped in a gas-tight manner . Crimping establishes a good electrical connection without
removing wire insulation and without pre-tinning the wire ends. Crimping enables repeatable
electrical termination of aluminum wires that are difficult to solder without corrosive side effects.
The crimp itself may be securely fixed to the pad or substrate by the solder.
[0024]
This aspect of the invention reduces wire breakage, establishes connections without corrosive
chemicals, enables good gas-tight connections, while enhancing the useful life of the readout
wire. Attachment of lead-out wires in an aspect is possible.
[0025]
The enclosure according to the invention preferably has a volume smaller than 250 cc and a
driver with an outer cone diameter preferably smaller than about 5.0 cm, with no audible
distortion, of the order of 105 dB at 1 meter position Gives an audible spectral component at a
higher range than the high frequency at the output level of the sound pressure (sound pressure)
level of.
The driver has a suspension system that allows relatively large peak-to-peak motion (typically 3.5
mm peak-to-peak deflection) for such a small cone, which is , It is an essentially linear function
(linear) of the signal amplitude applied to the voice coil for this excursion. The high frequency
assembly is characterized by a port mass resonance which keeps the cone deflection within this
range. The strength of the motor is abnormally high for such small drivers. Features include
structures that suppress unwanted parasitic resonances and small additional structures that limit
the magnetic field to avoid interference with picture tubes and the like. The enclosure includes a
novel pass through connector that establishes the connection between the thin lead to the driver
and the thicker lead to the amplifier.
[0026]
Other embodiments are within the scope of the following claims.
[0027]
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FIG. 2 is a block diagram illustrating the logical arrangement of a satellite-based electro-acoustic
conversion system according to the invention.
FIG. 1 is a general view of a high frequency assembly according to the invention. FIG. 2 is a
diametrical cross-sectional view of a driver according to the invention; FIG. 1 is an overall view,
partly in cross section, of an enclosure according to the invention; 5A and 5B illustrate in FIG. 5B
the improvement of the characteristics of the peripheral flux in the case of the driver according
to the invention as compared to the case of the conventional pot magnet structure shown in FIG.
5A. Fig. 6 shows the frequency response of a high frequency assembly according to the invention
without additional mass compliance between the driver and the main port outlet. Fig. 6 shows
the average frequency response in the room of the high frequency assembly according to the
invention without added mass compliance between the driver and the main port outlet. Fig. 6
shows the improved average frequency response in the room of the high frequency assembly
according to the invention with added mass compliance between the driver and the main port
outlet. FIG. 7 is a diagrammatic representation of an enclosure having a main port and an internal
dividing baffle with an intermediate port that represents additional mass compliance between the
driver and the port outlet. FIG. 7 is a schematic cross-sectional view of an enclosure of a high
frequency assembly according to the present invention, showing the features of the subports of
semi-rigid foam. 11A, 11B, and 11C are a general view, a plan view, and a cross-sectional view,
respectively, of a feed through plug for connecting a driver and an external cable. FIG. 5 is an
overview of an effective method of establishing a connection between a lead out and a voice coil
end using crimp soldered to an anchor pad. FIG. 7 is a fragmentary view of a voice coil wire end
with crimp attached. 14A, 14B, and 14C, respectively, are aspects of the ends of various
conductors.
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