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DESCRIPTION JP2013247660

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DESCRIPTION JP2013247660
Abstract: The present invention provides an electronic device of a type that can be used well and
which vibrates a panel to transmit air conduction noise and vibration noise. An electronic device
of a type that vibrates a panel to transmit air-conduction sound and vibration sound includes a
housing, a vibrating body disposed in a housing, and a microphone disposed in the housing. Is an
electronic device that performs a speaker function that listens to air conduction sound and
vibration sound generated by the vibration, and performs howling reduction processing while
executing the speaker function. [Selected figure] Figure 5
Electronics
[0001]
The present invention relates to an electronic device that presses a vibrating body held in a
housing against the user's ear to hear a sound by cartilage conduction.
[0002]
Patent Document 1 describes an electronic device such as a mobile phone that transmits airconduction sound and bone-conduction sound to a user.
Further, in Patent Document 1, air conduction sound is a sound transmitted to the eardrum by
the vibration of the air caused by the vibration of the object through the ear canal and vibrating
the eardrum. Have been described. Patent Document 1 also describes that bone conduction
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sound is sound transmitted to the user's auditory nerve through a part of the user's body (for
example, the cartilage of the outer ear) that contacts the vibrating object. ing.
[0003]
In the telephone set described in Patent Document 1, it is described that a short plate-shaped
vibrator made of a piezoelectric bimorph and a flexible material is attached to the outer surface
of a housing through an elastic member. In addition, according to Patent Document 1, when a
voltage is applied to the piezoelectric bimorph of the vibrator, the vibrator bends and vibrates as
the piezoelectric material stretches and contracts in the longitudinal direction, and the user
brings the vibrator into contact with the pinna It is described that the air conduction sound and
the bone conduction sound are transmitted to the user.
[0004]
JP 2005-348193 A
[0005]
However, the electronic device described in Patent Document 1 has a vibrating body attached to
the outer surface of a housing such as a mobile phone, and vibrates the vibrating body to hear a
sound, so a panel such as a protection panel of a display surface No problem has been considered
in the electronic devices of the type that vibrates the air and transmits the air conduction noise
and the vibration noise.
[0006]
An object of the present invention is to provide an electronic apparatus of a type that can be used
well and which vibrates a panel to transmit air conduction noise and vibration noise.
[0007]
The present invention has a housing, a vibrating body disposed in a housing, and a microphone
disposed in the housing, and by vibrating the vibrating body, an air conduction sound, and a
vibration sound generated by the vibration. The electronic device performs a speaker function to
listen to, and performs a howling reduction process while executing the speaker function.
[0008]
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It is possible to provide an electronic device of a type that can be used well and which vibrates a
panel to transmit air conduction noise and vibration noise.
[0009]
It is a figure which shows the functional block of the principal part of the electronic device which
concerns on one Embodiment.
It is a figure which shows the suitable shape of a panel.
It is a figure which shows roughly the principal part of the mounting structure of the electronic
device which concerns on one Embodiment of this invention.
It is a figure which shows an example of a vibration of the panel of the electronic device which
concerns on embodiment of FIG.
It is a flowchart which shows operation | movement of the electronic device which concerns on a
1st howling reduction process.
It is a flowchart which shows operation | movement of the electronic device which concerns on a
2nd howling reduction process.
[0010]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
[0011]
FIG. 1 is a diagram showing functional blocks of the main part of an electronic device 1
according to an embodiment of the present invention.
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The electronic device 1 is, for example, an openable / closable mobile phone that can be switched
between a closed state in which two housings having a call function overlap each other in a large
area and an open state in which the overlapping area is small or zero. For example, there are a
folding type, a slide type, and the like. Such a mobile phone includes the wireless communication
unit 5, the microphone 7, the panel 10, the display unit 20, the piezoelectric element 30, the
input unit 40, and the control unit 50. The wireless communication unit 5 has a known
configuration, and is wirelessly connected to a communication network via a base station or the
like. The microphone 7 is a well-known microphone such as a condenser microphone, and
collects a transmitted sound and the like emitted by the user at the time of a call via the wireless
communication unit 5.
[0012]
The panel 10 is a touch panel that detects a touch, a cover panel that protects the display unit
20, or the like. The panel 10 is formed of, for example, glass or a synthetic resin such as acrylic.
The shape of the panel 10 may be plate-like. The panel 10 may be a flat plate, or may be a
curved panel with a smooth surface. When the panel 10 is a touch panel, the panel 10 detects a
touch of a user's finger, a pen, a stylus pen, or the like. As a detection method of the touch panel,
any method such as a capacitance method, a resistance film method, a surface acoustic wave
method (or an ultrasonic method), an infrared method, an electromagnetic induction method, and
a load detection method can be used.
[0013]
The display unit 20 is a display device such as a liquid crystal display, an organic EL display, or
an inorganic EL display. The display unit 20 is provided on the back side of the panel 10. For
example, the display unit 20 is disposed on the back surface of the panel 10 by a bonding
member (for example, an adhesive). Alternatively, the display unit 20 is separated from the panel
10 and supported by the housing of the electronic device 1.
[0014]
The piezoelectric element 30 is an element that expands and contracts or bends according to the
electromechanical coupling coefficient of the constituent material by applying an electric signal
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(voltage). As these elements, for example, those made of ceramic or quartz are used. The
piezoelectric element 30 may be a unimorph, bimorph or stacked piezoelectric element. The
laminated piezoelectric element includes a laminated bimorph element in which bimorphs are
laminated (for example, 16 layers or 24 layers are laminated). The laminated piezoelectric
element is formed of a laminated structure of, for example, a plurality of dielectric layers made of
PZT (lead zirconate titanate) and an electrode layer disposed between the plurality of dielectric
layers. The unimorph stretches when an electrical signal (voltage) is applied, and the bimorph
bends when an electrical signal (voltage) is applied.
[0015]
The piezoelectric element 30 is disposed on the back surface of the panel 10 (the surface on the
inner side of the electronic device 1). The piezoelectric element 30 is attached to the panel 10 by
a bonding member (for example, double-sided tape). Hereinafter, the piezoelectric element and
the panel may be collectively referred to as a vibrator. The piezoelectric element 30 may be
attached to the panel 10 via an intermediate member (for example, a sheet metal). The
piezoelectric element 30 is spaced apart from the surface on the inner side of the housing by a
predetermined distance in a state of being disposed on the back surface of the panel 10. The
piezoelectric element 30 may be separated from the surface on the inner side of the housing by a
predetermined distance even in a state of expansion and contraction or bending. That is, the
distance between the piezoelectric element 30 and the surface on the inner side of the housing
may be larger than the maximum amount of deformation of the piezoelectric element 30.
[0016]
The input unit 40 receives an operation input from the user, and includes, for example, operation
buttons (operation keys). When the panel 10 is a touch panel, the panel 10 can also receive an
operation input from the user by detecting a touch from the user.
[0017]
The control unit 50 is a processor that controls the electronic device 1. At the time of a call, the
control unit 50 processes an audio signal that has been collected by the microphone 7 and
electro-acoustically converted, and is transmitted from the wireless communication unit 5.
Further, the control unit 50 applies, to the piezoelectric element 30, a predetermined electric
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signal (a voice according to the other party's voice, a side tone, a ringing tone, a voltage
according to an acoustic signal such as music including music). The audio signal may be based on
music data stored in the internal memory, or music data stored in an external server or the like
may be reproduced via a network.
[0018]
The open / close detection unit includes a Hall element disposed in one of the housings and a
magnetic force generating member disposed in the other housing. Detect the closed state.
[0019]
When an electrical signal is applied to the piezoelectric element 30, the piezoelectric element 30
stretches or bends in the longitudinal direction.
At this time, the panel 10 to which the piezoelectric element 30 is attached is deformed in
accordance with the expansion or contraction or bending of the piezoelectric element 30, and the
panel 10 bends and vibrates. Here, the maximum voltage of the electric signal applied to the
piezoelectric element 30 by the control unit 50 is, for example, higher than ± 5 V, which is an
applied voltage of a so-called panel speaker for the purpose of sound conduction by air
conduction sound instead of vibration sound. , ± 15V. Thus, even when the user presses the
panel 10 against his / her body with a force of 3 N or more (5 N to 10 N, for example), the panel
10 generates sufficient bending vibration to cause the user's body to Vibration noise can be
generated through a part (for example, the cartilage of the outer ear). In addition, it can be
suitably adjusted according to the fixed strength with respect to the housing | casing of the panel
10 or a support member, or the performance of the piezoelectric element 30 about what
application voltage is used.
[0020]
The panel 10 bends and vibrates not only in the mounting area where the piezoelectric element
30 is mounted, but also in the area away from the mounting area. The panel 10 has a plurality of
points vibrating in a direction intersecting the main surface of the panel 10 in the vibrating area,
and the value of the vibration amplitude changes from positive to negative with time in each of
the plurality of points. Or it changes in the opposite way. At a certain moment, the panel 10
vibrates in such a manner that the relatively large part of the vibration amplitude and the
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relatively small part of the vibration seem to be randomly or periodically distributed over
substantially the entire panel 10. That is, vibration of a plurality of waves is detected over the
entire area of the panel 10. Even if the user presses the panel 10 against his / her body with a
force of, for example, 5N to 10N, the controller 50 controls the piezoelectric element 30 so that
the above-described vibration of the panel 10 does not attenuate. The maximum voltage applied
may be ± 15V. Therefore, the user can hear the sound by bringing the ear into contact with the
area apart from the mounting area of the piezoelectric element 30 described above, for example,
the central portion of the panel 10.
[0021]
Here, the panel 10 may be approximately the same size as the user's ear. Also, as shown in FIG. 2,
the panel 10 may be larger than the user's ear. In this case, when the user listens to the sound,
the entire ear is easily covered by the panel 10 of the electronic device 1, so that it is difficult for
the sound (noise) to enter the ear canal. The panel 10 is wider than a region having a length
corresponding to the distance from the lower ear ring (lower leg) to the anti tragus and a width
corresponding to the distance from the tragus to the anti-ear wheel Should vibrate. The panel 10
preferably has a length corresponding to the distance from the portion near the upper ear ring
leg (upper upper wheel leg) to the ear lobe in the ear ring, and the distance between the portion
from the tragus to the portion near the anti ear ring in the ear ring A region having a width
corresponding to H may vibrate. The region having the above length and width may be a
rectangular region, or may be an elliptical shape having the above length as the major axis and
the above width as the minor axis. The average size of Japanese ears can be known by referring
to the Japanese Human Body Size Database (1992-1994) prepared by the Human Life
Engineering Research Center (HQL). If the size of the panel 10 is larger than the average size of
Japanese ears, the panel 10 is considered to have a size that can cover almost the entire foreign
ears. By having the size and shape as described above, the panel 10 can cover the user's ear and
is tolerant of displacement when placed on the ear.
[0022]
The electronic device 1 described above can transmit the air conduction sound and the vibration
sound through a part of the user's body (for example, the cartilage of the outer ear) to the user
by the vibration of the panel 10. Therefore, when outputting a sound having a volume equivalent
to that of a conventional dynamic receiver, the sound transmitted to the surroundings of the
electronic device 1 due to the vibration of air due to the vibration of the panel 10 is smaller than
that of the dynamic receiver. Therefore, it is suitable, for example, when listening to a recorded
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message on a train or the like.
[0023]
In addition, since the electronic device 1 described above transmits the vibration sound by the
vibration of the panel 10, for example, even if the user wears earphones or headphones, the user
can contact the electronic device 1 by contacting them. You can hear the sound through
headphones and body parts.
[0024]
The electronic device 1 described above transmits a sound to the user by the vibration of the
panel 10.
Therefore, when the electronic device 1 does not separately include a dynamic receiver, it is not
necessary to form an opening (sound outlet) for sound transmission in the housing, and the
waterproof structure of the electronic device 1 can be simplified. In addition, when the electronic
device 1 is equipped with a dynamic receiver, it is good for the sound emission port to be
obstruct | occluded by the member which lets gas pass but can not pass liquid. The part that is
permeable to gas but not liquid is, for example, Gore-Tex®.
[0025]
FIG. 3 is a view schematically showing the main part of the mounting structure of the electronic
device 1 according to one embodiment. 3 (a) is a front view, FIG. 3 (b) is a cross-sectional view
taken along line bb in FIG. 3 (a), and FIG. 3 (c) is taken along line cc in FIG. 3 (a). FIG. In the
electronic device 1 shown in FIG. 3, a cover panel (acrylic plate) for protecting the display unit
20 as the panel 10 is disposed on the front of the upper case 60a, and the input unit 40 is
disposed on the lower case 60b. It is a mobile phone of the formula.
[0026]
A reinforcing member 80 may be disposed between the panel 10 and the piezoelectric element
30. The reinforcing member 80 is a plate made of resin, for example, a plate made of resin, or a
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plate made of resin or glass fiber. That is, the electronic device 1 according to the one
embodiment has a structure in which the piezoelectric element 30 and the reinforcing member
80 are bonded by the bonding member 70, and the reinforcing member 80 and the panel 10 are
bonded by the bonding member 70.
[0027]
Further, in the present embodiment, the display unit 20 is not bonded to the panel 10, but is
supported by the housing 60a. That is, the electronic device 1 according to the present
embodiment has a structure in which the display unit 20 is separated from the panel 10, and the
display unit 20 and the support unit 90 which is a part of the housing 60a are bonded by the
bonding member 70. . In addition, the support part 90 is not limited to the structure as a part of
housing | casing 60, It is possible to comprise as a member independent of the housing | casing
60 by metal, resin, etc. FIG.
[0028]
An opening 42 is formed in the lower housing 60b. Further, the microphone 7 is mounted on the
circuit board 43 built in the housing 60 b so as to face the opening 42 in the housing 60 b.
Therefore, the microphone 7 has directivity on the side facing the input unit 40.
[0029]
According to the electronic device 1 according to the present embodiment, the reinforcing
member 80 and the panel 10 are deformed due to the deformation of the piezoelectric element
30 attached to the panel 10 via the reinforcing member 80, and the panel 10 contacts the
deformed panel 10 Air and vibration sound to the target object. Thus, the air conduction sound
and the vibration sound can be transmitted to the user without putting the piezoelectric element
30 itself on the ear. In addition, the piezoelectric element 30 is attached to the inner surface of
the housing 60 a of the panel 10. Therefore, the air conduction noise and the vibration noise can
be transmitted to the user without causing the piezoelectric element 30 to protrude from the
outer surface of the housing 60a. In addition, deformation occurs in the panel 10 not only in the
mounting area where the piezoelectric element 30 is attached, but also in any portion of the
panel 10 for transmitting the air conduction sound and the vibration sound. Therefore, in
addition to airborne sound through the air, the user can touch the ear to an arbitrary position of
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the panel 10 to hear vibration sound.
[0030]
Further, by arranging the reinforcing member 80 between the piezoelectric element 30 and the
panel 10, for example, when an external force is applied to the panel 10, the external force may
be transmitted to the piezoelectric element 30 and the piezoelectric element 30 may be damaged.
It can be reduced. Further, even if the panel 10 is in strong contact with the human body, the
vibration of the panel 10 can be hardly damped. Further, by arranging the reinforcing member
80 between the piezoelectric element 30 and the panel 10, the resonant frequency of the panel
10 is lowered, and the acoustic characteristics in the low frequency band are improved. In place
of the reinforcing member 80, a plate-like weight may be attached to the piezoelectric element
30 by the joining member 70.
[0031]
The panel 10 may constitute, for example, a capacitive touch panel, and in this case, the panel 10
is supported by the housing 60 a via the bonding member 70 and configured to be able to be
pressed by a pressing force of 3N to 10N. The display unit 20 is connected to the circuit board
130. In addition, a piezoelectric element 30 which constitutes a vibrating body together with the
panel 10 is joined to the upper back surface which is one end side in one direction of the panel
10 via a joining member 70. The piezoelectric element 30 has a rectangular shape, and is joined
such that its long side is along the short side of the panel 10. The bonding member 70 is an
adhesive having a thermosetting property, an ultraviolet ray curing property, or the like, a
double-sided adhesive tape, or the like.
[0032]
The input unit 40 is supported by the housing 60 b on the other end (lower) side in the
longitudinal direction of the panel 10. Further, as shown by a broken line, an opening 42 of the
microphone is formed in the input unit 40. That is, the piezoelectric element 30 is disposed on
the upper side of the rectangular casing 60a, and the opening 42 is formed on the lower side of
the casing 60b. The microphone 7 is mounted on the circuit board 130 so as to face the opening
42. Therefore, the microphone 7 has directivity on the side facing the panel 10.
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[0033]
FIG. 4 is a view showing an example of the vibration of the panel 10 of the electronic device 1
according to the embodiment of the present invention. In the electronic device 1 according to the
present embodiment, the panel 10 is an acrylic plate having a rigidity lower than that of the glass
plate, and the display unit 20 is bonded to the back surface of the panel 10. The amplitude
generated by the piezoelectric element 30 can be larger than that of the electronic device of the
type. Moreover, the panel 10 vibrates not only in the attachment area where the piezoelectric
element 30 is attached but also in an area away from the attachment area. Therefore, in addition
to airborne sound through the air, the user can touch the ear to an arbitrary position of the panel
10 to hear vibration sound.
[0034]
In the electronic device 1 according to the present embodiment, the first or second howling
reduction process is executed based on the sound collected by the microphone 7.
[0035]
FIG. 5 is a flowchart showing the operation of the first howling reduction processing when the
electronic device 1 executes the call function or the hearing aid function.
The hearing aid function is for the user who feels that it is difficult to hear sounds by collecting
surrounding sounds with the microphone 7 and playing back the loud sounds with the speaker
function. It is a function to assist in the hearing of
[0036]
In S501, the control unit 50 monitors the microphone input by detecting the incoming call of the
voice by the wireless communication unit 5 and the execution operation of the hearing aid
function, as well as activating the speaker function and analyzing the sound collected by the
microphone 7. . The sound to be monitored can be detected, for example, by sampling the output
signal of the microphone 7 for a certain period of time, and analyzing the frequency of the
sampled output within the audio frequency band to be transmitted.
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[0037]
In S502, in the predetermined range, for example, in a low frequency band of 300 Hz to 1.5 kHz,
the sound of the same frequency is detected within a predetermined time, for example, 5 times or
more within a predetermined time. Determine if If it is equal to or more than the specified
number, the process proceeds to S503. When the sound of the same frequency is not detected
more than the specified number of times, for example, five times or more, the process proceeds
to S501.
[0038]
In S503, since the sound of the same frequency is input more than the specified number of times,
it is judged that howling has occurred, and the sound is reproduced based on the signal obtained
by reducing or removing the sound of the frequency detected more than the specified number. .
Note that, while the speaker function is being performed, steps S501 to S503 may be repeated.
[0039]
FIG. 6 is a flow chart showing the operation of the second howling reduction processing when
the electronic device 1 executes the call function or the hearing aid function.
[0040]
In S601, the control unit 50 monitors the microphone input by detecting the incoming call of the
voice by the wireless communication unit 5 and the execution operation of the hearing aid
function, as well as activating the speaker function and analyzing the sound collected by the
microphone 7. .
The sound to be monitored can be detected, for example, by sampling the output signal of the
microphone 7 for a certain period of time, and analyzing the frequency of the sampled output
within the audio frequency band to be transmitted.
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[0041]
In S602, the control unit 50 determines whether sound of the same frequency is detected more
than the specified number of times, for example, five times or more in a predetermined range, for
example, a high frequency band of 1 kHz to 20 kHz. If it is equal to or more than the specified
number, the process proceeds to S603. If the sound of the same frequency is not detected more
than the specified number of times, for example, five times or more, the process proceeds to
S601.
[0042]
In S603, since the sound of the same frequency is input more than the specified number of times,
it is determined that howling has occurred, and the sound of the frequency detected more than
the specified number of times is reduced or eliminated to reproduce the sound. Note that, while
the speaker function is being performed, steps S601 to S603 may be repeated.
[0043]
For example, in an electronic device using a vibrating body that generates air conduction sound
and vibration sound, howling occurs when the vibration from the vibrating body is transmitted to
the human body and the opening 42 of the microphone 7 is covered by the human body in a
vibrating state. It has been found by the present inventors that it is likely to occur. Therefore,
such an howling reduction process is effective in an electronic device using a vibrator that
generates air conduction noise and vibration noise.
[0044]
In addition, when there is only one sound path (opening 42) that leads from the outside of the
housing to the microphone inside the housing as the sound input path to the microphone 7, the
sound intrusion path to the microphone is blocked. It has been found by the inventors that
howling is likely to occur. Therefore, howling reduction processing is effective in such electronic
devices.
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[0045]
Also, since the low frequency band has a longer time to detect the same specified number of
times than the high frequency band due to the high and low of the frequency, howling detection
in the low frequency band and howling in the high frequency band are It may be performed
separately from the detection. Thus, howling detection is performed earlier in the high frequency
band than in the low frequency band, and howling reduction processing in the high frequency
band can be performed without waiting for the detection result of the low frequency band.
[0046]
Further, the prescribed number of times may be different between the howling reduction
processing in the low frequency band and the howling reduction processing in the high
frequency band. For example, the prescribed number of times in the low frequency band may be
smaller than the prescribed number of times in the high frequency band. In this case, the
detection of the howling state in the low frequency band is so much for the detection of the
howling state in the high frequency band as compared to the case where the same prescribed
number of times is used as the threshold in the low frequency band and the high frequency band.
It can be done without delay.
[0047]
Further, the detection band of the low frequency band and the detection band of the high
frequency band may be overlapped, and in this case, the detection band is less likely to be
missed.
[0048]
Although the present invention has been described based on the drawings and examples, it
should be noted that those skilled in the art can easily make various changes and modifications
based on the present disclosure.
Therefore, it should be noted that these variations and modifications are included in the scope of
the present invention. For example, it is possible to rearrange the components, the functions
included in each step, etc. so as not to be logically contradictory, and it is possible to combine or
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divide a plurality of components or steps into one. is there.
[0049]
Moreover, in the above-described electronic device 1, the piezoelectric element 30 is attached to
the panel 10, but may be attached to a place different from the panel 10.
[0050]
In addition, the panel 10 can constitute any or all of a display panel, an operation panel, a cover
panel, and a lid panel for making a rechargeable battery removable.
In particular, when the panel 10 is a display panel, the piezoelectric element 30 is disposed
outside the display area for the display function. This has the advantage of being less likely to
interfere with the display. The operation panel includes, for example, a sheet key which is a
member which is integrally formed with the key tops of the operation keys and which constitutes
one surface of the housing on the operation unit side (lower side) in the foldable mobile phone of
FIG.
[0051]
In the above embodiment, the bonding member for bonding the panel 10 and the piezoelectric
element 30 and the bonding member for bonding the panel 10 and the housing 60 (60a) are
described as the bonding member 70 having the same reference numeral. However, as the
joining member, different ones may be used as appropriate depending on the members to be
joined.
[0052]
REFERENCE SIGNS LIST 1 electronic device 5 wireless communication unit 7 microphone 10
panel 20 display unit 30 piezoelectric element 40 input unit 42 opening 43 circuit board 44
sound collecting port 50 control unit 60, 60 a, 60 b housing 70 joining member 80 reinforcing
member 90 support 130 circuit substrate
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