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JPS5552697

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DESCRIPTION JPS5552697
Description 1, title of the invention
スピーカ
3. Detailed Description of the Invention The invention relates to a loudspeaker, in particular to an
electrodynamic direct-radiating loudspeaker, for example with an improved cone or diaphragm.
EndPage: 1is1 is a general structural view showing an example of an electrodynamic directradiating speaker to be a backpack according to the present invention. As its structure is well
known, a frame 1 for supporting a cone 7, a yoke 2 provided at the rear end of the frame 1 to
form a magnetic circuit, a magnet 8 for applying magnetism to the yoke 2, and And a pole 4
joined to the magnet 8 and whose tip is bounded by the opening of the yoke 2. The edge of the
cone 7 is supported by the edge 9 so as to be movable by the frame IIcJli, and the other end of
the cone 7 is connected to the voice coil 5 mounted on the coil frame 6. The coil frame 6 and the
voice coil 5 are supported on the frame 1 by the damper 8 so as to be properly positioned
between the open edge of the yaw 2 and the pole 4. And, lO is a cap, 11 is a terminal, and 12 is a
lead wire. The frequency characteristic of such a speaker is shown, for example, in FIG. In FIG. 2,
A is the area below the 鏝 low resonance frequency f of the speaker, b is the area where the
response is almost flat, and C is the area where the cone splits and vibrates. And in such a
speaker characteristic, it is desirable that the region B be extended to a wider frequency range.
And in order for the frequency characteristic to be flat, it must be in the range of inertial control
ifl. This means that the frequency f of the input is greater than the lowest resonance frequency
10, and the wavelength λ of the generated sound wave (-c / f, c is the speed of sound in air) is
larger than 2π times the radius 1 of the speaker cone Is the condition. That is, the input
frequency C is selected to be a region satisfying the following −I) equation and ~2 equation. f) f...
1 Next, it is a range in which the cone does not vibrate for 11Ij, but performs piston movement.
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The minute @ vibration is due to the resonance caused by the bending of the cone. Assuming that
the lowest frequency of this resonance, that is, the low frequency a of the minute # 1 vibration is
fl, the range of piston movement is a condition that i is considerably smaller than E, and in
general It is said that it should be below 4a. That is, the condition tc4 must be satisfied to satisfy
the first-order equation (3). f (−fl... −3) and, generally, the equation (2) is almost satisfied, so to
expand the region of B in FIG. It should be possible.
The lowest resonance frequency i is determined by the stiffness of the support of the cone 7 and
the voice coil 5 and the mass of the cone 7 and the voice coil 5, and this mass can not be
increased without reducing the efficiency of the speaker, It turns out that it is sufficient to
increase the compliance of the support in order to overcome this lowest resonance frequency f0.
However, in the conventional loudspeaker, if the compliance is too large, the support itself
becomes unstable and causes a failure, so the lowest resonance frequency f0 is generally selected
to a value around 5Qi (z.about.z). Also, the lowest frequency f1 of the divided vibration is
conventionally about a value of about several hundred to several thousand Hz, and as a result, in
the high frequency range, the divided vibration causes a sharp change as shown in FIG. .
Therefore, it is an object of the present invention to dramatically increase the lowest frequency i
of divided vibration by devising the shape of a cone, thereby providing a flat speaker with
frequency characteristics. According to the present invention, in summary, the cone is provided
with a corrugated crease, and the direction of the line formed by the concave and the convex
portions is such that the direction of the sound wave on the cone is I11. This is achieved by
leaving it in the direction of the line that the concave or convex part subsequently forms, or
substantially perpendicular to the line of contact with the crushing of the voice coil which exerts
a force on the cone. The foregoing objects of the invention and objects and features of the field
will become apparent from the detailed description given hereinafter with aiS wax. The 'ss
diagram is a general perspective view showing the preferred embodiment of the present
invention, FIG. 4 is a side-sectional view thereof and FIG. 5 is an illustrative view showing the
shape of the voice coil. In the EndPage: 2 configuration, a flat rectangular cone 107 is used in
this embodiment. And this cone 107 has a concave or convex crease in its cross section so that it
can be clearly understood particularly from FIG. Depending on the shape of the cone 107, the
cross-sectional shape in a plane perpendicular to the movement direction of the voice coil 105,
that is, the voice coil frame 106 is made rectangular as shown in FIG. Then, the voice coil 105,
that is, the voice coil frame 106 and the cone 107 are bonded, for example, by welding, an
adhesive or the like at the bonding portion 118. The voice coil 105 is supported between the
pole 104 and the yoke 102. The support of this coil 105 is preferably a frame 101 and support
wires 108.108. ... and by.
That is, one end of the support wire 10g is fixed at a predetermined position of the upper end
and the lower end of the voice coil frame 106, and the other end of the support wire 108 is fixed
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at a predetermined position of the frame 101. The support wire 10g is, for example, nylon or
carbon fiber. It can be made of metal wire or various other materials. The magnet 103 ° pole
104 also has a vertically-long structure in accordance with the shape of the cone 107, as can be
seen from FIG. In FIG. 4, these yokes 102, magnets 103 and poles +04 are shown. It is omitted to
simplify the drawing. And 111 is a terminal, 112 is a lead wire. The feature of this invention lies
in the corrugated shape of the cone 107. The waveform of the cone 107 is such that the
direction of the line formed continuously by the peaks or valleys of the wave is the direction in
which the sound wave travels on the cone 107. That is, the direction of this line is selected to be
substantially perpendicular to the line of contact with the frame 106 of the voice coil 105 that
drives the cable 7107. Conventionally, corrugation is performed on cones, but the conventional
cone corrugation is, for example, concentric corrugation, and the line formed by the peaks or
valleys is the direction in which the sound wave travels on the cone. It is perpendicular to the
Therefore, while such conventional corrugation aims to reduce the resonance due to the reflected
wave from the edge 9 shown in FIG. 1 in particular, the asperities of the present invention have
the lowest frequency of the divided vibration of the cone 107. It is intended to move the lowest
frequency from the reproduction frequency of the speaker to a single ^^ area by splashing. If the
corrugation is applied so that the direction of the line that such a mountain or valley part follows
will be the direction in which the shear wave travels on the cone, then if the cone is bent by the
vibration of that shear wave, The strength of the is enhanced, and it becomes overwhelmingly
difficult to bend compared to the case of a simple flat plate. As a result, the propagation speed of
the sound wave on the cone is dramatically thickened. Therefore, even if the cone 107 vibrates
when driven by the voice coil 105, its low resonance frequency f is much larger than that of a
simple flat plate. When this point is compared with the case of the conventional concentric
corrugation, in the conventional case, the bending vibration due to the sound wave of the shear
wave transmitted on the cone is J1 and sc in volume rather than the case of a simple plate, and
as a result, the divided vibration The lowest resonance J4m and the number f1 are lower than in
the case of the present invention as compared with the case of the plain flat plate. (Thus, the
corrugated crease or wave shape of the present invention is the same as the conventional
corrugation Is fundamentally different in its effects.
The effects of the present invention will be quantitatively described below. First, as shown in FIG.
6A, consider the case where the cone 107 is a simple flat plate. And FIG. 6C shows a cross
section when a is constant. Then, the voice coil attached to the central part of the width of the
flat plate in the X direction vibrates to receive a force in two directions from the cone, and the
central part of the cone reciprocates in the Z direction. As a result, as shown in FIG. 6C, a bend
occurs in the x-zii plane. In FIG. 6C, the direction in which the central portion of the thickness of
the flat plate (cone) is made is indicated by an alternate long and short dash line. Seat a (x, y)
before this center improvement point is subjected to bending deformation. It is assumed that it
has been at 0) and it has moved to time 11 (凰 e7 + ζ) as shown in FIG. 6C. At this time, the
function ζ (“* Y + <) M paired motion EndPage: 3 equation becomes as the following equation
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(4). (Note: For example, Landau-Lifshitsutsu, translated by Sato Tsunezo, Tokyo Books, Inc.,
“Elasticity Theory”, page 141, see ml.) However, the amount by which the plane formed by the
central part of the thickness of the flat plate deviates in two axes Where P is the density of the
plate, h is the thickness of the plate, E is the Young's modulus of the plate, and # is the Poisson's
ratio of the plate. Now, since the cone 107 of this flat plate receives a force from the voice coil
frame continued in the Y-axis direction by the vibration of the Heuss coil 105, the following
equation; i) is established because the wedge is constant in the Y direction. Then, when the length
of the plate in the X direction is l and both ends thereof are free ends, the vibration solution of
the following equation (6) is expressed by the following equation (6) assuming that the angular
frequency is 1 and the wave number is k. It is represented by.
+(cotkl−coshkllXcoskg+coatkn))・・・、6まただし、
coskJcoshkJlw+l・・・+71となる。 Here, the value of the minimum
wavenumber is from equation (7). It is expressed by the following equation (9). k = -X4.78 (9)
Therefore, the low (basic) frequency i of the divisional vibration of the cone cone 07 shown in
FIG. 6A is given by the following equation-from the equation (8) Be Next, as shown in the jlsB
diagram, the fundamental frequency 11 of the divided vibration when the cone has a waveform
shape as in the present invention is determined. As shown in this ss diagram, ie, FIG. 6B, when
the flat plate is formed into a corrugated shape, stress and strain in the Y-axis direction become
an interlayer due to bending, but Poisson's ratio I is small ## << 1 and σ 8 is When it can be
neglected, the same equation of motion follows the cone whose width in the Y-axis direction is
sufficiently long, and in the case where the width in the Y-axis direction can be regarded as a
mere rod because the width is short.
That is, the vibration due to bending in the x-2 plane of the ragged surface of FIG. 6B is the same
as the vibration of a bar with only one wave peak or valley as shown in FIG. This luck is due to
bending of the central axis (X @) shown in FIG. The amount of displacement in the IIi + direction
follows the following equation (b). (Refer to Note 2). Translated by Sato Tsunezo, Tokyo Books,
Inc. "Elasticity Theory", p. 142. Here, df is a minute area element of the cross section in the YZ
plane. · Vibration of this equation of motion The solution is expressed by the equation 161 for
the free end of length l in the X-axis direction, as in the case of the flat plate shown by @ 6 man
figure, and the boundary condition for wave number is the flat plate Similarly, is given by the
above equation (7), and hence the relationship between each frequency ω and the wave number
is given by the following equation. Therefore, the fundamental frequency of the divided vibration
of the cone 107 of the waveform shape shown in FIG. Is represented by the following formula-.
FIGS. 7A to 7C are each a cross-sectional view showing EndPage of the waveform shape: 4example. Then, the I / S of the sLn equation is calculated for the S shapes shown in FIGS. 7A and
7B and 7C. At this time, the thickness h of the plate is sufficiently smaller than the maximum
difference d of the heights of the asperities, and can be ignored. Then, I / S in FIG. 7 8, @ 7 B, and
7 C are sequentially given by the following expression a 4. Therefore, the fundamental frequency
i of the divided vibration in each case is sequentially given by the following equation-. When the
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front set is compared with the set, when the cone 107 is corrugated as in the present invention,
sixth, ie, in the cone 107 according to the present invention, a line formed by a mountain or a
valley follows. By forming asperities in the propagation direction of the shear wave traveling on
the cone, the minimum (basic) Jl wave number f of the divided vibration is at least doubled to 4d
/ a while keeping the mass of the cone 107 unchanged. You can do more than that. In the
following, the fundamental frequency f1 of the divided vibration in the case of applying the
present invention to the woofer and the tweeter and in the case of a flat plate will be calculated
specifically. First, the length 1 is 16 cIM, the length in the Y direction is 45 m, for example, so as
to have approximately the same area as a conventional 30 scratch woofer, the plate thickness h
is l +++ m, and the maximum difference d of the heights of the asperities is Assuming that the
solution 80 is 1, the frequency i in each case where beryllium and aluminum are used as the cone
material is shown in the following Table 1. Table l Beryllium 689 (H 11 11 10 10 40 wings) l 烟
O city Real mini fA 288 () k) 'part 9X 10 I 9 J 9 10] 6 pigs 10 ° C μ length l 1!
Assuming that the length in the Y-axis direction is 9, 73 corresponding to the conventional 51
tweeter, the thickness h of the plate is 9.2 ams, and the maximum difference d of the heights of
the irregularities is 8III, the beryllium cone material is used. Or frequency i when made into
aluminum is represented by following Table 2. Table 2 Beryllium 6 M then 10 I 1 1 0 0 b) 1% 16
mm] 9 aluminum bowl aluminum 2A 7 X 10 round table plate 2 X 10 square 5. The thickness of
the plate is thin to Q, ls + s + position (in the case of woofer and tweeter only when the
unevenness of the present invention is wrinkled, of course). It is. Here, the maximum difference d
is 3Qss with woofer. What is 3-tweaked in the tweeter is to take into consideration the phase
difference of the emitted sound wave. That is, it is necessary that the phase difference of the
sound wave emitted from this concave or convex is sufficiently smaller than the wavelength of
the sound wave in air at the highest reproduction frequency of the woofer or tweeter,
respectively, and therefore this maximum difference d Is limited by the following equation 11 @.
As can be seen from Tables 1 and 2 of Table 1 and 2 above, according to the present invention,
the basics of the divided vibration by corrugating the cone with a line having a line extending in
the direction of sound wave propagation. The frequency f0 can be dramatically increased. Also,
the effect of this uneven fold is that the material of the cone is not metal, and there is a total of
one hat for commonly used cone paper and any other material. By this uneven fold, the
fundamental frequency f1 can be made four or more times as high as the reproduction frequency
f of the speaker, and as a result, as shown by the s @ ta + formula, it is difficult to move the cone
EndPage: 5. For this reason, it is possible to eliminate sharp peaks and valleys in the high region
of the frequency characteristic due to this divided vibration axis. In the above-described
embodiment, the effect has been described by taking a rectangular cone as an example, but
similarly to a conventional wedge-shaped or elliptical cone, a speaker having only a piston
movement without divided vibration is similarly used. It can be made. 8A is an illustrative view
showing another embodiment of the present invention. FIG. 8A mainly shows a cone 107 and a
voice coil 105, and in this example, the cone 107 has a disk shape, The ridges or valleys are
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connected in a direction substantially perpendicular to the joint or bonding portion 118 with the
voice coil frame 106, so that the ridges or valleys are connected to form a crease. Furthermore,
in the conventional loudspeaker as shown in FIG. 1, since the central part of the cone is concaved
compared to the peripheral part, the sound wave emitted from the air has a phase difference
between the central part and the peripheral part of the cone, This point also adversely affects the
frequency characteristics.
However, in this embodiment, only the sound waves emitted into the air at the center of the cone
and the periphery are shown in FIGS. 3 and 8, and the embodiments shown in FIGS. There is no
part corresponding to 10) in the figure. Therefore, there is a risk that the air in the voice coil
frame 106 will not be in and out of place as the voice coil 105 vibrates. To this end, in any of the
embodiments, one or more small holes (not shown) may be opened in the central portion of the
cone 107, and this may be used as the air entry / exit date. FIG. 9 is an illustrative view showing
another embodiment of the present invention. Also in this figure, the cone 107 and the voice coil
105 are mainly shown. In the embodiment of FIG. 9, the cone 107 is formed in the shape of a
horn and is further provided with a corrugated crease. Such horn-shaped cone 107 and voice coil
frame 106 may be connected, for example, by surface contact with the outer peripheral side
surface of the end of coil frame 106 with the inner peripheral side surface of the end of cone
107. FIG. 10 is an illustrative view showing another embodiment of the present invention, and
FIG. 11 shows a cross-sectional view thereof. In this embodiment, a rectangular cone as in the
embodiment of FIG. But their cones are 10'1. IQ7b。 It is divided into 1G7C. And, as can be
seen from FIG. 11, the cone 107b is bent in a semicircular shape, and the cones 107m and 107C
are bent so as to be approximately 1⁄4 of a circle. Then, the junction between the divided cones
107 to 107C and the voice coil frame 106 is performed by means of 118a11 and 118d as shown
in FIG. In this way, for example, as compared with the simple line contact joining as shown in FIG.
3 or FIG. 4, the junction becomes surface contact, and non-line stable joining or bonding can be
made. When the cone 107 and the voice coil frame 106 are joined by line contact as shown in
FIGS. 8 and 8A, for example, as shown in FIG. A cap 114 having a depth to the extent that 06 is
inserted may be attached, and the cap 114 and the frame 106 may be joined by surface contact.
At this time, it is desirable that the cone and the cap 114 be integrally processed. The cap 114 as
the connecting member may be simply L-shaped, and one may be fixed to the cone and the other
to the coil frame. Furthermore, in the embodiment shown in FIGS. 8 to 5, there is another feature.
That is, the support of the cone 107, that is, the voice coil frame 106 is performed by the support
wire 10g without using the conventional damper structure. If the support of this cone is lighted
by a damper (8 in FIG. 1) as in the prior art, it is difficult to reduce the minimum resonance
frequency i to some extent or more in order to prevent the support from being unreliable. In
addition, such a conventional damper causes mechanical resistance when the voice coil moves,
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lowering the efficiency of the speaker, and the mechanical resistance is constant in a wide
frequency range or a large amplitude range of the voice coil. It had an adverse effect on the
frequency characteristics because it did not exist. Therefore, in a more preferred embodiment of
the present invention, the EndPage: 6 conventional damper is not used for ε1 and the support
line IO8 does not destabilize the support of the cone or the voice coil, and the minimum
resonance frequency f0 is dropped. New support structure that can be made smaller. However, in
the present invention, it goes without saying that conventional dampers and edges may be used
without a particularly novel structure. FIG. 12 is an enlarged view of a voice coil frame 10g
shown in FIG. 8A and its supporting wire 10jl. As shown in this figure, when the voice coil 105,
ie, the coil frame 106, is stretched in a direction perpendicular to the axis (X) of the cylinder, the
support line 10g is stretched or shrunk, so that it is thick and resilient. . However, with respect to
the movement & in the direction of the axis of the voice coil 106 or the cylinder of the frame
106, when the angle 0 in FIG. 12 is small, the extension or contraction of the support line 108 is
small and the restoring force is small. If so, the stiffness in the direction perpendicular to the
cylindrical axis of the coil 105 can be very large, and the stiffness to the movement of the voice
coil IO5 for driving the cone can be made sufficiently small, so that the compliance of the
support can be The frequency can be increased to make the lowest resonance frequency
sufficiently small. The difference in stiffness according to the movement direction of the voice
coil 105 will be quantitatively described below. 18A, 18 IA and 18 C show only one support line
108, and based on these III 8 A to ill 80 diagrams, the restoring force generated by the
movement of the voice coil 105 is calculated for each case. In FIG. 18A, assuming that 1 has
moved to b by the downward movement of the voice coil (the arrow in FIG. 18A), assuming that
the distance between the points mb is ΔT, the elongation ΔL of the support line 108 is Formula
(represented by 1 乃.
However, the increase in tension of the support line 108) F is expressed by the following
equation-. LΔF−5 □ A... Where Σ is the Young's modulus of the support line 108, L is the
length of the support line, and A is the cross-sectional area of the support line 10g. Therefore,
the magnitude i of the upward restoring force given to the voice coil supported by this support @
108! Is expressed by the following equation 4. That is, the stiffness Sy with respect to
displacement in the direction perpendicular to the axis of the voice coil (shown in FIG. 18A) is
given by the following equation-. As shown in FIG. 18B, considering the restoring force against
the axial movement, the extension line L of the support line 10g is given by the following
equation (good), and the increase in tension 4f by it is The axial restoring force lx given to the
voice coil at this time is given by the following equation-. In other words, the stiffness Sx with
respect to the displacement of the voice coil in the axial direction (shown in FIG. 18B) is the
following formula%% Thus, when comparing the front set with the set, the following formula If
the angle 0 is set to a sufficiently small value and the material or thickness of the support line
108 is appropriately selected, the stiffness S EndPage: 7 can be made sufficiently large. However,
the voice coil 1'05 can be firmly held in the center of the gap between the pole 104 and the pole
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102. Furthermore, if the angle 0 is selected sufficiently small, the axial stiffness S! Of the voice
coil 1G & is smooth, and the lowest resonance frequency i can be made sufficiently small. In the
above description, although the restoring force due to the elongation of the support wire 10g is
obtained, assuming that the tension T of the support wire 10g at the equilibrium position of the
voice coil 105 is T, the magnitude of the restoring force due to the change of the angle From, it
becomes as follows. That is, in the X axis direction, it is represented by the following equation-,
and in the Y axis direction, it is represented by the following equation (good). Accordingly, at this
time, the tension 7r can be appropriately adjusted when the support line 10B is fixed to the
frame IO1, but the size of the gravity degree working with the cone 107 and the voice coil 1054
can be appropriately adjusted. If it is this stiffness Sx '. S-A 'is the stiffness set SX shown in front
set 8 and set. It is sufficiently smaller than Sγ and can be ignored. As described above, according
to the present invention, the cone has a cross-sectional waveform shape, and the continuous line
of the peaks or valleys of the wave is aligned with the propagation direction of the acoustic wave
propagating on the lawn (上 IIII number). The lowest (basic) frequency 6 of the split vibration can
be dramatically increased, so that a flat speaker with frequency characteristics can be obtained.
Therefore, what used expensive beryllium as a corn material in the tweeter can be made cheaper
aluminum. Conversely, if a beryllium is used, a speaker with better characteristics can be
obtained.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural schematic view showing an
example of a conventional electrodynamic direct emission speaker as a background of the
present invention. FIG. 2 is a diagram showing an example of the frequency characteristic of the
speaker shown in FIG. Ils diagram is a perspective view showing a preferred embodiment of the
present invention, FIG. 4 is a plan view of FIG. 3 excluding the magnetic circuit, and FIG. 5 is a
voice coil movement direction showing the shape of the voice coil. It is an illustration figure
which shows a cross section perpendicular | vertical to.
スピーカ
6A to 6E are diagrams for explaining the present invention in detail. Each of FIGS. 7A to 7C is an
illustrative view showing a waveform shape applied to the present invention. FIG. 8A is a view
showing another embodiment of the present invention, and FIG. 8B is a cross-sectional view
showing the cap 114. FIG. 9 is a view showing still another embodiment of the present invention.
FIG. 10 is a view showing another embodiment of the present invention, and FIG. 11 is a
schematic plan view of FIG. FIG. 12 is an illustrative view showing a state of being supported by
the support wire 108 with the voice coil frame 106. As shown in FIG. 11A to 18C are diagrams
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for explaining the restoring force acting on the voice coil by the support wire 10g, respectively.
In the figure, reference numeral 101 denotes a frame, 102 denotes a yoke, 103 denotes a
magnet, 104 denotes a pole, 1 ° 5 denotes a voice coil, 106 denotes a voice coil frame, 107
denotes a cone, and 108 denotes a support wire% B. Patent applicant Hiroshi Fukumoto (4
others) Attorney Attorney Fukai Fube EndPage: 8 Fig.2 Fig.6 AII 6th BalEndPage: 9 Procedure
Amendment Showa s 4th July W Color, Japan Patent Office Secretary Showcase 1 Showa Showa
53 year patent application first! 7142 No.2 Invention No.2 Invention No. Speaker No.3
Amendment to the Case Patent Applicant Address Nishinomiya Heavy Film Uemachi 5-10-287
Riyagami Hitoshi p. Name] 4, Agent 2 title of the invention
スピーカ
Column 7 of the detailed description of the invention of the specification, the contents of the
correction (1) Specification page 84 line 14! Correct the 15th line to the following sentence. It is
noted that the elongation length L of the support line 108 is expressed by the following equation
(b). It is apparent from FIG. 12 that the restoring force works in the direction opposite to the
direction of displacement, and therefore, in the following description, only the size is discussed,
ignoring the direction of both the force and the displacement. (2) Fl + Il book z page 1st formula
and formula (2) are corrected as follows. Note EndPage: 13
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