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DESCRIPTION JP2001252620

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DESCRIPTION JP2001252620
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
multi-functional vibration actuator which is mainly mounted on a mobile communication device
such as a portable telephone and has a function of generating a ringing tone, voice or vibration.
[0002]
2. Description of the Related Art FIG. 12 shows a cross-sectional view of a conventional
multifunctional vibration actuator. In the multi-functional vibration actuator shown in FIG. 12, a
magnetic circuit composed of a yoke 1 ′, a permanent magnet 2 ′ and a plate 3 ′ is
assembled with a suspension 6 ′ having a plurality of spiral shapes fixed to a support 9 ′. The
outer peripheral portion of the yoke 1 'is supported by the claws 30 provided on the housing 31
via the elastic member 8', and the dome-shaped vibrating body 7 'is fixed to the support 9' like
the suspension 6 '. In the structure, when a drive current is supplied to the coil 5 ′, the magnetic
circuit or coil 5 ′ moves up and down in the axial direction, transmits the elastic material 8 ′
from the support 9 ′ or the yoke 1 ′, and It was structured to transmit vibration to the outside.
[0003]
In such a conventional structure, external vibration transmission due to relative movement of the
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magnetic circuit and coil is performed through the elastic material from the support or yoke,
resulting in low efficiency. Therefore, the applied voltage had to be increased. Furthermore, since
the yoke is exposed, it may be adversely affected by external contact and the like.
[0004]
Further, in the case of a spiral-shaped suspension, the band is narrow due to the acute angle Q at
the resonance of vibration, and if a large displacement of the resonance occurs depending on the
use conditions, it has to be driven by a complicated circuit. Moreover, since the terminal part was
not formed, the coil wire was not fixed and it might break on the way by an external factor etc.
[0005]
Therefore, the object of the present invention is to increase the degree of freedom of operation of
the magnetic circuit and coil in each mode, to enhance the efficiency of vibration / sound
transmission to the outside, and to suppress the sharp Q at the resonance of vibration. It is to
provide a multifunctional vibration actuator which can be driven by a simple fixed frequency
input circuit, which has a wide band characteristic and can be subjected to resonance positional
displacement under use conditions.
[0006]
SUMMARY OF THE INVENTION In order to solve these problems, the multi-functional vibration
actuator of the present invention mounts a coil at any position in the radial direction of the
vibrator, and the vibrator is between the suspension and the magnetic circuit, Then, instead of
the claws, a vibration transmission portion is provided for protection of the yoke outer peripheral
portion, and the suspension of the magnetic circuit central portion is supported by the
suspension of the arc-shaped spiral plate spring fixed to the vibration transmission portion. And
a multi-functional vibration actuator of a multi-layer support structure fixed by using an elastic
material or the like between each of the magnetic circuits or between the vibration transmission
unit and the vibration body or the suspension.
[0007]
The yoke tip portion is formed in a projection or concavo-convex shape in which magnetic flux is
easily concentrated, and by adopting an internal magnet type, external magnet type or high
magnetic flux density for the magnetic circuit and a radial type structure for leakage flux
countermeasures, vibration and It is a multifunctional vibration actuator capable of increasing
the efficiency and reducing noise of vibration and sound transmission to the outside by
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increasing the degree of freedom of operation of each of the magnetic circuit and coil in each
mode of sound.
[0008]
At this time, the vibrating body has a flat plate shape, a plate shape, a curved surface shape, a
corrugation shape, or a combination of each.
Positioning of the coil can be achieved by providing a recess at any position in the radial
direction and attaching a coil to the vibrating body, and providing one or more stoppers of
arbitrary shape on the inner circumference of the vibration transmission section or a plurality of
stops. It is a multifunctional vibration actuator that can be easily removed and the adhesion
process can be eliminated, and the inhibition to the coil and the vibrator can be eliminated.
Also, the coil may be divided into one or more.
[0009]
The suspension is provided with spring holes on the disk at equal intervals on the surface of the
suspension of the magnetic circuit, and a tip portion of a groove-like spring hole forming a part
of a spiral and a spring hole adjacent to this spring hole. The rigidity in the radial direction is
reduced by overlapping at least one location with the end portion of the base with the central
axis as a reference, and the effective length of the spring is extended. Therefore, even when an
external force such as falling is applied, permanent strain I will not leave.
[0010]
By using an elastic material between each member to form a multilayer support structure,
performance degradation due to abnormal stress at the time of drop is prevented, acute Q at
resonance of vibration is suppressed, and displacement of resonance due to use conditions
occurs. Is a multifunctional vibration actuator that can be driven by a simple fixed frequency
input circuit.
The cover is provided with one or more holes of any diameter, and the vibration transmission
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part is further provided with one or more leak holes as required.
The terminal part is provided in the outer peripheral part of the vibration transmission part.
[0011]
That is, the present invention relates to a multi-functional vibration actuator having a magnetic
circuit, a vibrating body, a coil attached to the vibrating body, a vibration transmitting portion,
and a central axis as main components, wherein the coil is a magnetic circuit. A suspension of an
arc-shaped spiral leaf spring is provided at an arbitrary position on a plane which is disposed in
an air gap and which is substantially perpendicular to the vertical movement direction in the
magnetic circuit when an electric signal is input to the coil. The suspension is a multifunction
vibration actuator fixed to a vibration transfer unit and flexibly supporting a magnetic circuit,
and the vibrator is disposed between the magnetic circuit and the suspension.
[0012]
Further, according to the present invention, spring holes are provided at equal intervals on the
disk on the surface of the suspension of the multi-function vibration actuator, and a tip portion of
a groove-like spring hole forming a part of a spiral and this spring hole The multi-functional
vibration actuator has a structure in which the end portions of the spring holes adjacent to each
other overlap at least one place with respect to the central axis.
[0013]
Further, according to the present invention, the grooved spring holes of the suspension spring
portion of the multi-functional vibration actuator are directed to the center portion of the spring
hole at both end portions of the spring hole and one side with respect to the center of the
suspension spring portion. The other side is a multi-functional vibration actuator having a shape
in which the other side draws an arc to a position forming a spiral leaf spring which maintains a
predetermined distance between the adjacent spring holes in parallel.
[0014]
Further, according to the present invention, at least one suspension of the multifunctional
vibration actuator is installed, and the material of the suspension is at least one of SUS304,
SUS301, nickel white, phosphor bronze and beryllium-copper (Be-Cu) alloy. It is a multifunctional
vibration actuator that is one type of metal spring material.
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[0015]
In the multi-functional vibration actuator according to the present invention, the magnetic circuit
of the multi-functional vibration actuator is any of an inner magnet type structure, an outer
magnet type structure, or a radial type structure.
[0016]
In the multi-function vibration actuator according to the present invention, the vibrator of the
multi-function vibration actuator has a flat plate shape, a plate shape, a curved surface shape, a
corrugation shape, or a combination of each.
[0017]
In the multi-functional vibration actuator according to the present invention, the coil of the multifunctional vibration actuator is fixed to an arbitrary position in the radial direction of the vibrator
by an adhesive or the like.
[0018]
Further, according to the present invention, the coil of the multi-functional vibration actuator is a
multi-functional vibration actuator installed by being divided into one or more.
[0019]
Further, according to the present invention, the vibrator of the multi-functional vibration actuator
is provided with a recess at an arbitrary position in the radial direction, and the coil is fixed on or
in the top of the protrusion formed by the recess. It is a multifunctional vibration actuator.
[0020]
Further, according to the present invention, there is provided a multifunction vibration actuator
in which a projection is formed in the recess of the vibrator.
[0021]
Further, the present invention is a multifunctional vibration actuator having a multilayer support
structure in which a suspension of the multifunctional vibration actuator, the vibrator, the central
axis, and the magnetic circuit are respectively fixed via an elastic material.
[0022]
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In the multi-functional vibration actuator according to the present invention, the vibration
transmitting portion of the multi-functional vibration actuator, the vibrator and the suspension
are fixed via the elastic material.
[0023]
Further, according to the present invention, there is provided a multifunctional vibration actuator
in which the suspension of the multifunctional vibration actuator and the inner and outer
peripheral portions between the vibrators or either one of them are bonded by the elastic
material.
[0024]
Further, according to the present invention, there is provided a multifunctional vibration actuator
in which a stopper is provided on one, a plurality of or a whole of the inner peripheral portion
inside a vibration transmitting portion of the multifunctional vibration actuator.
[0025]
Further, according to the present invention, the cover of the multi-functional vibration actuator is
a multi-functional vibration actuator in which one or more holes of any diameter are provided.
[0026]
Further, according to the present invention, the tip of the yoke of the magnetic circuit of the
multi-functional vibration actuator is a multi-functional vibration actuator having a shape of
protrusion or unevenness.
[0027]
In the multi-functional vibration actuator according to the present invention, the suspension and
the vibration transmitting unit of the multi-functional vibration actuator may be integrated by
insert molding, an adhesive, or welding.
[0028]
In the multi-function vibration actuator according to the present invention, the vibration transfer
unit of the multi-function vibration actuator is a part of the vibrator at high frequency and
vibrates.
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[0029]
In the multi-function vibration actuator according to the present invention, the vibration transfer
portion of the multi-function vibration actuator is a fixed portion at low frequencies and an
elastic body at high frequencies.
[0030]
Further, according to the present invention, the vibration transfer unit of the multifunction
vibration actuator is a multifunction vibration actuator provided with one or a plurality of leak
holes of an arbitrary shape as needed.
[0031]
Further, according to the present invention, there is provided a multifunction vibration actuator
in which a terminal portion is provided on an outer peripheral portion of a vibration transfer
portion of the multifunction vibration actuator.
[0032]
Further, the present invention is the above-mentioned multifunctional vibration actuator, wherein
the cover of the multifunctional vibration actuator is provided with a sound output hole so as to
satisfy the principle of Helmholtz's resonator as required.
[0033]
Further, according to the present invention, the vibrator of the multi-functional vibration actuator
is polyether imide (PIE), polyester (PET), polycarbonate (PC), polyphenylene sulfide (PPS),
polyarylate (PAR), polyimide (PI), And the aramid (PPTA), wherein the multifunctional vibration
actuator is formed of at least one plastic material.
[0034]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A multifunctional vibration
actuator according to an embodiment of the present invention will be described below.
[0035]
Example 1 FIG. 1 is an explanatory view of a multifunctional vibration actuator according to
Example 1 of the present invention, and FIG. 1 (a) is a top view with a part cut away, and FIG. 1
(b) It is AA sectional drawing of Fig.1 (a).
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[0036]
In the multi-functional vibration actuator of FIG. 1, a magnetic circuit is formed by the yoke 1
and the plate 3 so as to sandwich the disk-shaped permanent magnet 2, and the magnetic circuit
has an internal magnetic circuit structure.
A central shaft 4 in the form of a bolt or pin is inserted through the central hole of the vibrator 7
and the magnetic circuit, and the vibrator 7, yoke 1, permanent magnet 2 and plate 3 are
coaxially positioned. It is done.
[0037]
FIG. 2 is a top view of a suspension of a multifunction vibratory actuator according to the present
invention.
The suspension 6 is, as shown in FIG. 2, a single spiral helical leaf spring, which flexibly supports
the magnetic circuit, and is fixed to the central shaft 4 and the first vibration transmitting portion
9.
[0038]
A vibrating body 7 in which the coil 5 is fixed by an adhesive or the like is provided between the
magnetic circuit and the suspension 6.
The coil 5 is located at an arbitrary position in the radial direction of the vibrator 7 and is
disposed in the air gap of the magnetic circuit.
At this time, between the central axis 4 and the magnetic circuit such as the vibrator 7, the
suspension 6, the plate 3, etc., and between the vibration transmitting portion 9 (10) and the
vibrator 7 or the suspension 6, an adhesive, adhesive, resin or By providing an elastic material 8
such as a softener to form a multilayer support structure, sharp Q at resonance of vibration is
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suppressed to provide a wide band characteristic, and in the acoustic mode, the movement of the
vibrator by coil movement becomes large. , Sound pressure improvement.
[0039]
The front end portion of the yoke 1 of the magnetic circuit is formed into a shape such as a
projection or an unevenness so that a high magnetic flux density is easily generated even in an
internal magnet type or an external magnet type.
The direction of the magnetic poles of the permanent magnet 2 may be either direction.
[0040]
The suspension 6 is made of SUS304, SUS301, nickel-white, phosphor bronze and at least one
metal spring material of beryllium-copper (Be-Cu) alloy, and it is insert-molded and welded with
the vibration transmitting portion 9 (10) Integrated by bonding, etc.
[0041]
Further, as shown in FIG. 2, the suspension spring portion 21 arranges the spring holes 20 at
equal intervals on the disk on the surface of the suspension 6 of the magnetic circuit, and forms a
groove-shaped spring hole 20 forming a part of a spiral. The tip end portion and the end portion
of the spring hole 20 adjacent to and parallel to the spring hole 20 overlap with each other in an
angle range of 55 degrees or more with respect to the central axis 4 to make the spring effective
length 19 in the suspension spring portion 21 longer. It has the following structure.
Therefore, when an external factor such as a drop impact in the radial direction is applied, the
magnetic circuit is displaced in the radial direction, but the rigidity in the radial direction is small
and no permanent strain is left.
[0042]
The vibrator 7 may have any plate thickness such as planar, plate-like, curved, corrugation or a
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combination of each, and in the case of curved, it may have predetermined acoustic
characteristics by combination of single curvature or different curvatures. To be able to get
At this time, the vibrator 7 is formed of at least one plastic material of PIE, PET, PC, PPS, PAR, PI,
and aramid (PPTA).
Further, the outer peripheral portion of the vibrating body 7 is fixed to the vibration transmitting
portion 9 or 10 through an elastic material 8 such as a pressure sensitive adhesive, an adhesive
or a resin in order to obtain a larger amplitude of the vibrating body 7.
[0043]
A stopper 101 is provided on the inner peripheral portion of the second vibration transfer unit
10 in order to avoid contact with the vibrating body 7 due to excessive amplitude due to a drop
impact of the magnetic circuit, etc. One is formed over the entire inner peripheral portion There
is.
The stopper may be formed in a plurality or partially on the inner circumferential portion.
[0044]
The coil wire 18 is attached to the terminal plate 12 of the terminal portion 11 provided in the
second vibration transmitting unit 10 by soldering 13 or the like, and the coil wire 18 and the
connection portion are attached. Is covered with a protective agent 14 for protecting the
[0045]
The first vibration transmitting unit 9 and the second vibration transmitting unit 10 may be
integrally formed, and are made of a resin or the like that brings about an elastic action, and the
cover A15 and the cover B16 are multifunctional vibration actuators. It is used to protect the
functional body of
At this time, one or more holes (or sound emission holes) 17 of any diameter are provided in the
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cover A15, and when used as a sound emission hole, the principle of Helmholtz's resonator is
satisfied. Adjust the hole diameter etc.
At this time, it is necessary to be careful that there is no inflow and outflow of air other than the
holes or the sound release holes 17.
The above can be similarly performed in any of FIGS. 3 to 11 shown below.
[0046]
(Embodiment 2) FIG. 3 is a cross-sectional view of a multifunctional vibration actuator according
to Embodiment 2 of the present invention.
The multi-functional vibration actuator shown in FIG. 3 is one in which the inner magnetic type
magnetic circuit of the multi-functional vibration actuator shown in FIG. 1 has an outer magnetic
type magnetic circuit structure.
[0047]
EXAMPLE 3 FIG. 4 is a cross-sectional view of a multifunctional vibration actuator according to
Example 3 of the present invention.
In the multi-functional vibration actuator of FIG. 4, the inner magnetic type magnetic circuit of
the multi-functional vibration actuator of FIG. 1 has a high magnetic flux density structure and a
radial magnetic circuit structure in consideration of measures against leakage flux.
A doughnut-shaped permanent magnet 2b is sandwiched and fixed to an outer peripheral portion
of the yoke 1b and a plate 22 such as a resin via an adhesive and positioned coaxially.
Here, the magnetization direction of the doughnut-shaped permanent magnet 2b is the
circumferential direction.
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[0048]
Example 4 FIG. 5 is a cross-sectional view of a multifunctional vibration actuator according to
Example 4 of the present invention.
The multifunctional vibration actuator of FIG. 5 divides the coil 5 of FIG. 1 into a two-divided coil
portion A23.
When the two-divided coil portion A23 or the magnetic circuit vibrates, a strong magnetic flux is
applied to either one of the coils 5b or 5c.
[0049]
(Fifth Embodiment) FIG. 6 is a cross-sectional view of a multifunctional vibration actuator
according to a fifth embodiment of the present invention.
In the multi-functional vibration actuator of FIG. 6, a vibrator recess 24 for positioning the coil 5e
and increasing the amplitude of the vibrator 7a at the time of driving is provided on the outer
peripheral part of the vibrator 7a. The coil is fixed to the upper side with an adhesive or the like
and disposed in the air gap of the magnetic circuit.
[0050]
EXAMPLE 6 FIG. 7 is a cross-sectional view of a multifunction vibration actuator according to
Example 6 of the present invention.
In the multi-functional vibration actuator shown in FIG. 7, the coil 5f is inserted into the vibrating
member 7b having the vibrating member 25 formed therein, fixed by an adhesive or the like as
necessary, and disposed in the gap of the magnetic circuit. .
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By making the vibrating body 7b into this structure, positioning of the coil 5f is facilitated, and
damage to the vibrating body 7b when an abnormal operation of the magnetic circuit occurs due
to an external factor such as a drop impact, and film peeling of the coil 5f Furthermore, it is
possible to prevent breakage or peeling of the coil 5f from the vibrator 7b, and to prevent the
deterioration of the vibration or the acoustic characteristic.
[0051]
EXAMPLE 7 FIG. 8 is a cross-sectional view of a multifunctional vibration actuator according to
Example 7 of the present invention.
In the multi-functional vibration actuator of FIG. 8, the protrusion 26 is formed so that the coil 5g
is not detached from the vibrator recess 25 provided in the vibrator 7c of FIG.
[0052]
EXAMPLE 8 FIGS. 9 and 10 are cross-sectional views of a multifunctional vibration actuator
according to Example 8 of the present invention.
The multi-functional vibration actuator of FIGS. 9 and 10 is obtained by dividing the coil 5 of the
multi-functional vibration actuator of FIG. 1 into two and providing a two-divided coil portion
B27 and a two-divided coil portion C28.
This means that when the two-divided coil portion B27, the two-divided coil portion C28 or the
magnetic circuit vibrates, a strong magnetic flux is always applied to one of the divided coils.
[0053]
First, in FIG. 9, the divided coil 5i is inserted into the vibrator recess 24a of the vibrator 7d, and
the other coil 5h is arranged by the recess of the vibrator 7d so as to be disposed in the air gap
of the magnetic circuit. It adheres with an adhesive agent etc. on the convex part top surface
formed.
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[0054]
In FIG. 10 shown next, two divided coils are inserted into the vibrator recess 25a of the vibrator
7e, and since the two coils are covered with the thin plate of the vibrator 7e, abnormal vibration
and vibration are generated. It is possible to prevent the magnetic circuit from coming into
contact with the coil due to the like.
Further, a protrusion 26a is formed between the two coils inserted into the recess 25a of the
vibrating body 7e as necessary, and is further fixed by an insulating agent such as an adhesive.
[0055]
(Embodiment 9) FIG. 11 is an explanatory view of a multifunctional vibration actuator according
to Embodiment 9 of the present invention, FIG. 11 (a) is a cross-sectional view of the
multifunctional vibration actuator, and FIG. It is an acoustic characteristic.
The multifunction vibration actuator of FIG. 11 is a cross-sectional view and acoustic
characteristics of an embodiment in which a leak hole 29 is provided in the second vibration
transfer unit 10a of the multifunction vibration actuator of FIG.
[0056]
As shown in FIG. 11A, the sound pressure of 10 to 30 dB is attenuated by providing one or more
leak holes 29 of an arbitrary shape such as a circle or a polygon in the second vibration transfer
unit 10a. The characteristics can be controlled, and flat frequency characteristics can be realized
in a frequency band of about 300 to 3,000 Hz that sufficiently satisfies the IEC 318 and 711
standards shown by the broken line in FIG. 11B. It became.
[0057]
In these embodiments, when a drive current is applied to the coil 5, the magnetic circuit flexibly
supported by the vibrator 7 and the suspension 6 fixed to the vibration transmitting portions 9
and 10 through the elastic members 8a, 8b and 8c. The vibrator 7 to which the coil 5 is fixed
repeats movement and performs vibration and sound transmission to the outside, but at that
time, the vibrator 7 is made of any material, shape, thickness, etc. and adhesive, adhesive or
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resin. Etc., which is attached via an elastic material 8a, 8b, 8c, etc., and bonded with a sponge-like
soft agent provided on the central axis 4 and the outer peripheral part or an adhesive material
such as double-sided tape to make a multilayer support structure Amplitude is given to vibrate
air, high sound pressure level and wide band acoustic characteristics are obtained, and by using
elastic members 8a, 8b and 8c between each member, acute angle Q at resonance is suppressed
by using It can provide bandwidth characteristics.
[0058]
At this time, the first vibration transmitting unit 9 and the second vibration transmitting unit 10
become fixed parts at low frequencies and elastic bodies at high frequencies to become a part of
the vibrating body 7 and vibrate, thereby causing vibration and sound. In each of the modes, the
magnetic circuit and the vibrator 7 operate while interfering with each other.
Further, since the members other than the magnetic circuit, the coil 5 and the central shaft 4
provide an elastic action, the performance deterioration due to the abnormal stress such as the
drop impact can be reduced.
[0059]
As described above, according to the present invention, the coil is fixed to the vibrating body, and
the vibrating body is provided between the suspension of the arc-shaped spiral leaf spring fixed
to the magnetic circuit and the vibration transmitting portion. By attaching an elastic material
between the members such as the inner and outer peripheral portions of the suspension and the
inner and outer peripheral portions of the vibrating body to form a multilayer support structure,
the degree of freedom of operation of the magnetic circuit and coil in each mode is increased. To
improve the efficiency of vibration and sound transmission to the sensor, suppress the sharp Q at
the resonance of the vibration to provide a wide-band characteristic, and drive with a simple
fixed frequency input circuit even if displacement of resonance occurs due to use conditions It
has become possible to provide functional vibration actuators.
[0060]
In addition, by inserting the coil into the recess provided at any position in the radial direction in
the vibrator, positioning of the coil is facilitated, the bonding process can be reduced, and any
shape can be formed on the inner peripheral portion of the vibration transmission portion By
providing one or more stoppers or the whole of the inner circumference, it has become possible
to provide a multi-functional vibration actuator capable of eliminating the obstruction to the coil
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and the vibrator.
[0061]
As described above, according to the present invention, the degree of freedom of the operation of
the magnetic circuit and coil in each mode is increased to enhance the efficiency of vibration /
sound transmission to the outside, and the acute angle Q at the resonance of vibration is
achieved. It is possible to provide a multi-functional vibration actuator that can be driven with a
simple fixed frequency input circuit even when resonance position displacement occurs due to
use conditions, resulting in wide band characteristics.
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