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JPS5930400

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DESCRIPTION JPS5930400
[0001]
This invention relates to electromagnetic transducers, and more particularly to electro-acoustic
transducer assemblies that can be used as audio speakers. Various types of electro-acoustic
transducers are conventionally known under the names of acoustic transducers, speakers, audio
speakers etc. The most common is a cone diaphragm, which converts the electrical signal from
the source into a compressed airwave signal to the surrounding medium, which the listener
interprets as an audible sound. Cone diaphragms perform this conversion by generating an
oscillatory action with warping and bending motion due to significant deflection of the
diaphragm. Such movements are inevitable to introduce distortion during electro-mechanical
conversion, and as a result, the current state of the art is directed to acoustic transducers using
robust radiating members . U.S. Pat. No. 4,107,479 shows the most recent development of the
prior art. In this U.S. patent, a series of spaced diaphragms, shaped to act as a rigid member, are
interconnected by drive means and are integrally driven from the signal generating means.
Heretofore, there have been many acoustic transducers based on making the diaphragm robust
by corrugating. So far, none of them has been successfully manufactured. The reasons for the
commercial failure of these waveform diaphragm converters are explained as follows. 1. Wind
the coil as described in U.S. Pat. No. 1,934,184 and keep the long side straight (7) or the wire
does not form a second layer during the winding process It is very difficult to do it. Even though
the coil is initially wound into a rectangle, the wires tend to be misaligned along the former.
When the coil is wound into a circle and shaped into a rectangle, it is extremely difficult to
provide parallelism and correct spacing between the two long sides of the coil. The second and
more important reason is as follows. When driving the diaphragm at the periphery, when the
diaphragm is driven upward, the center tends to bend downward, and when driven downward,
the center bends upward. Due to this tendency, the diaphragm is stretched as a whole, and the
resonant frequency is about fB / n. Here, fII is the resonance frequency of one waveform
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(including the reinforcement lip), and n is the number of waveforms provided on the diaphragm.
As a result, the diaphragm can not be lengthened arbitrarily and the high frequency side
response can not be maintained, and the claimed advantages of the wave surface transducer are
lost, and a dome shaped radiator simpler than this is lost. Become.
The present invention has features (8) that provide advantages over the prior art. The structure
of the invention has the advantage of a robust diaphragm, but is also small and efficient. The
drive of the present invention and one strong diaphragm have a close relationship, so that the
ratio of the contact area of the drive means to the area of the diaphragm is much larger than
before, so the distortion of the diaphragm The efficiency of converting the driving motion into
the motion of the diaphragm is further increased. In contrast to the prior art, the coil of the
invention is wound with a tool that controls the linearity to any suitable degree, which maximizes
the packing of the conductors, whether round or rectangular flat conductors, It is impossible for
the winding to go around. The invention solves the second problem mentioned above in several
ways. 1. The waveform portion is replaced by a reinforced closed surface having a very high firstorder decomposition frequency (f> 20 KH2 for high-pitched speakers). 2. Mechanically couple
the coil to the diaphragm to match the one to lower the primary decomposition frequency so that
the diaphragm / coil support structure does not extend as a whole, even if a portion of the
diaphragm tends to stretch . 3. The parts of the diaphragm are coupled to one another such that
the parts are isolated. 4. The material between each part is shaped to allow each part to translate
in the desired direction and is used to form the suspension member. A support is added to the
frame of the diaphragm connecting these components. Each part is one completely "independent"
and therefore no reduction of the primary decomposition frequency occurs. This method also
serves to position the coils very precisely and magnetically. The object of the present invention
will become apparent from the detailed description of the present invention, comprising at least
two pairs of magnets, each pair of magnets being separated by a first distance in one direction
and spaced apart by a first distance. A pair of elongated members spaced apart by a larger
distance than the second gap such that each pair of gaps is separated in a different direction to
form a second gap; Coil support, a spiral coil wound on the outer surface of each elongated
member, an end of which is coupled to the electrical signal generating means, and an inner
surface of the elongated member disposed in the second gap Electroacoustical transducing with a
diaphragm and a coil support assembly including a non-flexible non-planar diaphragm member
mounted between and one elongated member disposed in the first gap of each pair Achieved by
the The objects of the invention will be better understood from the following description of the
drawings. FIG. 1 shows an exemplary embodiment diaphragm and coil support assembly / which
includes a diaphragm S and two coil support members.
Typically, the diaphragm S is made of a material having a large modulus of elasticity and a large
ratio of tensile modulus to mass, so that the acoustic transmission speed is high. Aluminum is a
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suitable diaphragm material. Boron, benzene and graphite are other suitable materials, which
have very high elastic moduli, which are more advantageous but are much more expensive. The
diaphragm S is configured to be non-planar. Besides the shape of the diaphragm S shown in FIG.
1, another form of diaphragm is shown in FIGS. 4 and 4A. Another form of the diaphragm S as
shown in FIG. 4 (11) is geometrically composed of two halves of a mirror image. Typically, each
hand is comprised of aluminum with a thickness in the range of 0.3 to 1 mil. The preferred
thickness is 7.7 mils for reproducing high frequencies and 3 to 5 mils for reproducing low
frequencies. Combine both cows by a thin layer / l of low Q material such as polyethylene. The
advantage of using low Q materials is understood when considering the action of the diaphragm.
Considering the diaphragm in the form of FIG. 4A, when the two cows are combined in a positive
L <<, a flat portion 13 of the diaphragm is formed between adjacent tubes / j of the diaphragm.
The polyethylene joint is at the flat part / 3. The flat portion 3 is provided with a gap 19 for
decoupling the adjacent tubes. Any distortion of the cross-sectional shape of any one tube / S
when the diaphragm S is driven along the entire length of the tube / S will not cause distortion of
any other tube of the diaphragm S. Therefore, it has been found that even where the tube
resonance is higher than 20 KHz, the tendency to cause interaction between the adjacent
portions of the diaphragm S is disturbed. As a matter of fact, many other materials can be used to
couple 12 the diaphragm 3's hands, but the advantages of using very light weight, low Q
materials are lost. In any of the embodiments, the shape of the diaphragm is non-planar. In any of
the different forms of the diaphragm of the invention, it is essential that the diaphragm be of low
mass. This solves the problems of inertia as well as the energy required to move the diaphragm,
and can further increase the high frequency response. 5A and 5B show various embodiments of
the diaphragm / coil support /. FIGS. 6 and 7 show a typical coil support 3 with coiled
attachment. A typical winding of the coil 7 is shown. The coil is wound into a rectangular spiral
using a flat conductor, referred to in the industry as "one flat wire", and the wire is layered with
flat faces together to form the outer surface of the diaphragm / coil support. Form a stack to
attach to.
Form the fill 7 in the typical way of tightly packing the conductor film by winding flat surfaces
together and then curing with clamps along the flat surface of the outermost layer Can do. In FIG.
6A, note that when the coil is attached, the current i flows from left to right in the coil of the
upper half 3a of the coil support 3 and from right to left in the coil of the lower part 3b of the
coil support 3. I want to be The coil support 3 also has the additional function of becoming a
suspension member for the diaphragm S, as best shown in FIG. The coil support 3 is divided into
two or both hands, and there is a slot 9 for holding the diaphragm between them. Thus, when the
coil support 3 closes and bonds the slot holes, it keeps the diaphragm rigid along the edge O of
FIG. 4B in which the diaphragm is enfolded. The coil support can be formed of plastic material or
metal that withstands high temperatures. As a result of the edge being closed by the closed
groove 9, the corrugated diaphragm S is resistant to movement in the form of a transverse curve.
A typical drive assembly λ 1 is shown in FIG. The diaphragm / coil support assembly / is
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inserted into this assembly. In the preferred embodiment, four permanent magnets 3 are used.
The rear part of the assemblage 2 / is not shown in the figure, although the magnetic alignment
is of opposite polarity, ie the acoustic aperture or gap is the S pole, and the gap S is Although the
opposite side is an N pole, it is symmetrical with respect to the portion shown. The magnet core 3
may be a typical ferrite magnet. Each magnetic core 3 is provided with an inner pole piece a and
an outer pole piece t. The inner pole piece 27, 27 has a rectangular tear-off, in each of which two
spacer channels 3 / are provided. A pair of channels 31 are arranged diametrically opposite one
another at each inner pole piece so that the precision spacer 33 can pass therethrough. The
spacer 33 is a precision machined nonmagnetic threaded rod, the length of which determines the
critical dimension of the spacing of the gap S as shown in FIG. Permanent magnet core 3 and
pole piece core, core? が4つのプラテン)、?! It is held in place by r. These brackets extend
across the width of the outer pole piece 9 and abut (15) the inner pole piece at the outer surface
3 of the inner pole piece. The bracket 3S is shown in a perspective view in FIG. 2 engaged with
the drive assembly 2 /, and a plan view is shown in FIG. Each bracket 33 is a generally
rectangular zero bracket 3S completely through the two holes 3q so that a screw for holding the
precision spacer 33 can be inserted.
The bracket 3S may, for example, be a machined aluminum bar, a die cast product or an injection
molded part. An alternative arrangement is conceivable for screw engagement. Threaded spacers
or spacers in the form of nuts and bolts are also conceivable, and for mounting the head flush,
the bracket 3S may be provided with countersinks (not shown). Bracket 3S has a stepped groove
11. ? This groove adjusts the position of the diaphragm / coil support assembly l when holding
the assembly l (FIG. 3) and inserting the assembly l into the drive assembly 2 / VC. As shown in
FIG. 2, the outer pole piece co-t is L-shaped. When in position, the inner and outer pole pieces K,
9 form a magnetic gap fin S therebetween. (16) The outer pole piece a9 forms an air gap duct
between the adjacent pole pieces 9a. The gap lIS is hereinafter referred to as the magnetic gap S,
which for high frequency devices has a thickness of about 0.030. This is an individual magnet
assembly (9. 2.? It is a precise size determined by installing the body. In order to form an
operable electroacoustic transducer, the magnet 23, the pole piece λ 1.2q and the bracket 3!
The f are arranged by a precise spacer 33 so as to form a uniform and precise gap spacing
between the outer surfaces of the pole pieces. The accuracy of the gap should follow the industry
standard practice. As a practical matter, it is possible to use a bar magnet, such as a sintered
BaFeOH permanent magnet, generically called Ferrox 5A, to construct the drive assembly. This
material is sold by Indiana General Campani under the trade designation "Indox 5A". The
diaphragm / coil support assembly l with the coil 7 in place is inserted into the drive assembly 2
/. For this purpose, a support frame 9 for the diaphragm / coil support assembly l is used. The
illustrated frame dab 9 is for a diaphragm of the type shown in FIGS. 4A and 4B. 8 and 8A show
the details of frame lI9. This frame is generally rectangular and has a width and a thickness
which make it possible to slide and fit on the groove 3 of the facing bracket 33 as shown in FIG.
Frame 4 '? There is an opening S / inside the. This opening is large enough to surround the coil /
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diaphragm assembly l, but the assembly l is spaced from the inner edge of the opening 1 /. At the
opposite inner edge S of the opening Sl, there is a recess S3 extending longitudinally along the
edge 32. The depth of the four parts S3 is about half of the thickness of the frame t.
By fixing the lugs S da in the four parts S3, the coil / diaphragm assembly l is movably mounted
in the opening j /. The lugs can be extensions of one or the other of the flexible members that
make up the diaphragm and can be fixed to the four parts S3 by any suitable adhesive. Although
the lug jl I is shown, an equivalent mounting which supports the assembly l in a movable manner
in the opening Sl can be used. The eight lugs 66 shown in FIG. 8 make frictional contact with the
outer surface 3 of the inner pole piece core in the vicinity of the clearance gap S, thus precisely
aligning the coil 7 and the coil support 3. In operation, when the framed diaphragm / coil
support assembly 1 is attached to the drive assembly, the audio speaker operation is one of the
translational effects by linear translation. As seen in FIG. 6A, when the current of the portion of
the coil 70 above the diaphragm 3 flows in one direction, the current of the portion of the coil
below the diaphragm S necessarily flows in the opposite direction. . FIG. 10 is a plan view of FIG.
The frame lI9 is omitted to make the drawing easy to see. The diaphragm / coil assembly l shown
here has two independent coils. Note the use of 7 '. One coil 7 is placed in the gap pt ', II, t "', and
the other coil t 'is placed in the gap da, t, <z, t'. As shown, the gaps 1 ', 44. The magnetic flux of t
'is from right to left, (19) gap + j,! ,! The magnetic flux of t "is from left to right. For this reason,
when the current of the portion of the coil disposed in the space gap S ′ ′ ′ is directed to the
paper surface, the force applied to the diaphragm S at this time is directed to the lower side of
the drawing. As shown in FIG. 6A, at this time, the current of the portion of the coil disposed in
the gap dab S 'is in the direction coming out of the drawing, and as a result, the force applied to
the diaphragm 3 is downward in the drawing. The coil 7 'is connected in series or in parallel with
the coil 7 so that the current passing through the portion of the coil 7' disposed in the gap II, t 'is
directed to the plane of the figure, and the gap 1 in the coil 7'. Make sure that the part placed
inside is oriented out of the drawing. As a result, four gaps da S, da, t ', lI,! -', 4 (and each of the
current applied to the diaphragm svc by the current of the &, is the downward direction of the
drawing at the current of the above-mentioned direction. When the direction of the current is
reversed, the force applied to the diaphragm is directed out of the drawing. It should be noted
that the orientation towards or out of the drawing is only with respect to the plane of the
drawing.
In typical operation, the transducer is oriented as shown in FIG. 2 and (20) the motion of the
diaphragm S is alternately directed towards and away from the listener. Furthermore, when the
coil in gap 4'j ', Da S "' is pushing diaphragm 3, the coils in gap lIj, 4 !, t 'are pulling diaphragm 3
and thus the asymmetry of the magnetic field Cancel out the harmonic distortion and further
reduce even-order harmonic distortion. When the assembly l is accelerated, the diaphragm 3
tends to expand. This tendency is counteracted by the tension generated along the length of the
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coil support 3 which holds it. At this time, the resonant frequency is set relative to the modulus
of elasticity of the material used to construct the coil support 3 and the mass of the assembly /.
One way to reduce resonances to such a point as to virtually eliminate them is to increase the
frequency at which such resonances occur. For this purpose, diaphragms of the type divided into
non-planar sections as shown in FIG. 4A are used. A diaphragm S is coupled to the coil support 3
along the edge 61 of FIG. 5B, rather than the void 63 space. Stiffness is obtained because the
fork-shaped portion 6S of the support ending in the edge 61 resists the tendency of the tube
portion 13 of the diaphragm S to distort from a rounded state. The meaning of "stiffness" in this
case is that the diaphragm S itself does not bend or bend. In order to be attached to the frame by
means of a flexible member as shown at S4c in FIG. 1, the diaphragm 3 / coil support assembly /
can be translated as a whole and vibrate in that sense. This assembly does not vibrate in the
sense that one point in the plane of the diaphragm moves relative to any other point in the plane
of the diaphragm. This is referred to as "rigid" in terms of a surface, meaning that the points on
this surface do not move relative to one another during operation. The hollow portion 63 of the
coil support 3 is a fork-shaped portion 6! Even if it bends, it does not cause the overall extension
of the diaphragm assembly. The lowest resonance frequency is obtained, for example, in a 1/8
inch diameter tube section using a 0.0005 inch aluminum tube since the deflection of the tube
section 3 does not lead to the elongation of the diaphragm 3 Is higher than 20 KHz.
Reinforcement ribs (not shown) can be inserted along the length of the diaphragm 3. The rib
contacts the diaphragm S in the same manner as the coil support 3. The action of such a rib is to
further suppress the deflection of the diaphragm S. As a result, a diaphragm S having a wider
width is obtained, and even in such a case, the high frequency response of the diaphragm having
the narrow width shown is mixed. The basic closing 'WJ is a tube.
This is shown in FIG. 4, by combining the two hands using a suitable known bonding material / l,
or by vapor deposition, electroless plating, electroplating or compression molding etc., very thin
walls Can be made by forming a tube 1110 (FIG. 4C) with FIG. 4D shows the mechanical bonding
of a sheet to form the tube 44/2. These tubes are made rigid by means of the disk stiffeners of
FIGS. 4E and 4F or by inner or outer reinforcing ribs such as the ribs 44 / A of FIGS. 4G and 4H.
(The thicknesses of the materials in FIGS. 4C-4H are not practical. A further conceivable
reinforcing member is a ball as shown in FIG. 4 and FIG. In these figures, the disk 171 g of the
gate and the convex disk − are shown respectively. In most applications, such ribs or discs are
used in the construction of the foil / diaphragm support. See Figures 5C and 5D. リブllココ。
4! It should be noted that the overlapping parts of Koda are made possible. This is similar to
that shown in FIG. 5B, except for the overlap. Figures 4 and 4A show one way of joining the
tubular sections so that a high degree of insulation is maintained. Variations are shown in the
fourth to fourth figures. Fourth, in the variant shown in the figure, two complementary sheeters
26. The diaphragm is made by forming -g in the form shown and bonding. In this case, the
isolation of the parts is achieved by the material between the tubes being slightly S-shaped. A
second variation, shown in FIG. 4L, is to incorporate this S-shape into the lower part of the Q of
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the diaphragm shown in FIG. This makes the isolation stronger than any previous form. Portions
13θ, 4 ',? Although it is a material having a high modulus Q and a large elastic modulus, the
partial dam 3II is a material having a small Q and a small elastic modulus (24). As known, Q is
the ratio of energy stored per cycle to energy lost. In the form shown in FIG. 4M, a material dam
36 is arranged between the tubular part dams 3g. This material is a small Q material such as
polyethylene. This small Q material IIJ4 is held in place by the diaphragm support 1IIio so that
the behavior of each part is completely independent of the other. The frame for this structure is a
two-piece molding material such as synthetic resin, zinc or aluminum, which holds the
diaphragm.
The hand of the frame is shown in more detail in FIGS. 12-14. FIG. 9 schematically shows a
device with a large number of carp / I // coil supports 3 across a wide diaphragm S. The
diaphragm 5 is an internal reinforcing rib or disc 4! /4!。 It is shown to have a da / 6 to
allow the coil / coil support assembly to be spaced further apart. It should be noted that the two
center coils / coil support assemblies have coils 7 on both sides of the support 30. This is to
drive the diaphragm S in each part in the same manner. In this embodiment, the permanent
magnets are ferrite type and the pole pieces are soft iron. Each assembly can be separately
magnetized without energy loss using a simple magnetizing coil. FIG. 11 is an exploded
perspective view of the combination of the diaphragm and drive assembly, frame 27 ', of the
frame of the diaphragm and fill support assembly. See Figure 4M for details of the relationship
between the diaphragm and the frame. The only meaningful difference between Assemblies 7
'and Assemblies is as required in Assemblies / Grows I3 (FIG. 2), the frame 33 There is no
stepped groove for receiving lI octopus. Although Coilk passes continuously through each side of
the subdivision IIII of the frame of the assembly as seen in FIGS. 15 and 16, it is omitted in FIG.
11 for the sake of clarity. 0 In FIG. 12 to FIG. 14, beams IIq interconnect the support pads O of
all the diaphragms shown in FIG. 4M. The projection dab 6 is used to position the diaphragm in a
direction parallel to the translation of the diaphragm. This is shown in FIGS. 15 and 16. While the
projection lI 6 projects to position the diaphragm vertically, the diaphragm support ttIIo
positions the frame / coil / coil support / diaphragm assembly relative to the gap of the drive
assembly Please be careful. Usually, the converter is used such that the vertical upper part of
FIGS. 15 and 16 is actually in the front-rear direction. The coil is attached to the support 3 of the
diaphragm 3 as shown in FIGS. 6A, 6B, 7 and 10. A pin t30 engages the socket dab to hold both
sides of the assembly frame + + + +-and align it as shown in FIGS. The distal part, 1+, ends the
two parts of the support assembly to provide a bracket for the support qqO. 6 shows six supports
I /, I10 per assembly. Although the magnet configuration shown in FIGS. 2 and 10 is the
preferred embodiment, other configurations are possible.
An example is shown in FIGS. 17 and 18. But. It should be noted that all magnetic gaps are the
same (arrangement, size, spacing). The magnet and (27) pole piece of FIG. 17 are repositioned so
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as to obtain a shallower but wider structure. In FIG. 18, the position, size and distance of the gap
are the same, but the pole pieces are shaped so that the horn effect can be obtained on the front
and rear sides (upper and lower sides in FIG. 18). In both forms, the positioning bracket can be
formed as in FIG. 3 and with the fixed position of the coil / coil support correctly positioned in
the gap while fixing the relative position of the inner pole piece. The diaphragm can be easily slid
into the position. With samarium cobalt magnets, the dimensions of the magnet structure are
significantly reduced, which is completely compatible with any of the shapes shown, simply by
shrinking the magnet and the corresponding pole piece. The entire assembled audio transducer
described above can be mounted in a well-looked housing like a regular speaker. While the
invention has been described in terms of a preferred embodiment, it will be appreciated by those
skilled in the art that various modifications are possible within the scope of the invention.
(28)
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view of a diaphragm / coil support assembly of the type Fi 1, FIG. 2 is a
perspective view of a housing of a magnet drive assembly, in which the diaphragm / coil support
assembly is inserted.
3 is a plan view of the alignment member of the magnet assembly, FIG. 4 is a perspective view of
a half of the diaphragm of the present invention, and FIG. 4A is a simplified end view showing a
complete cross section of the diaphragm of FIG. FIG. 4B is a perspective view of the diaphragm,
and FIGS. 4C to 45 show various modifications of the basic closed surface tube of FIGS. 4 and 4A.
Fourthly, Figures 4 to 4L show various ways of joining the tube sections instead of the ones
shown in Figures 4 and 4A. Fig. 4M shows a suspension system compatible with the diaphragm
shown in Fig. 4A, Fig. 5A is a perspective view of a diaphragm /: 2 yl support compatible with the
diaphragm of Fig. 4B; 5B is a perspective view of a half of the diaphragm / coil support
compatible with the diaphragm of FIG. 4A, and FIGS. 5C and 5D are coils of a deformation
compatible with the diaphragm shown in FIG. 4A. 2 shows a diaphragm support. 6A is a top view
of the diaphragm / coil support showing the diaphragm (edge) in position and the coil in
position, and FIG. 6B is a view of the coil support taken along line 6B-6B of FIG. 6A. FIG. 7 is a
perspective view of the diaphragm / coil support, showing a coil with a flat wire. 8 is an
orthographic view of the support rods of the diaphragm / coil support assembly, FIG. 8A is a
cross-sectional view of the support rods of the diaphragm / coil support assembly taken along
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line 8A-8A of FIG. FIG. 10 is a schematic view of another example assembly using a magnifying
diaphragm, and FIG. 10 is a simplified plan view of the drive assembly of FIG. 2, where the
diaphragm / coil support assembly of FIG. It shows the state of being placed in FIG. 11 is an
exploded perspective view of a modification of the present invention, a part of which is omitted.
12 is a side view of one half of the diaphragm / coil support assembly of FIG. 11, FIG. 13 is a
cross-sectional view taken along line 13-13 of FIG. 12, and FIG. FIG. 15 is a plan view of a half of
the diaphragm / coil support assembly, FIG. 15 is a partial horizontal sectional view showing the
assembled state of the embodiment of FIGS. 11 to 14, and FIG. 16 is circled in FIG. 17 is a partial
plan view showing the magnet configuration of the drive assembly of the modification, and FIG.
18 is a partial plan view similar to FIG. An example of Description of main symbols 3: Coil
support S: Diaphragm 7: Coil co /: Driver 3: Magnet co 3: acoustic gap k, co q: pole piece lIg:
magnetic gap (31) FIG, 5 BFIG, 8 FIG, 8 F FIG :, 1 F FIG, 15 FIG, I 8
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