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JP2000277970

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DESCRIPTION JP2000277970
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
portable information devices such as portable telephones and pagers, and more particularly to a
magnetic shielding apparatus provided with a method of shielding the magnetism of electronic
parts provided with magnets.
[0002]
2. Description of the Related Art Conventionally, there is a portable telephone as shown in FIG. 4,
for example, as a portable information device on which an electronic part having a magnet is
mounted. A receiver 44 for outputting sound is provided on the front surface side of the printed
circuit board 43, and a radio circuit unit 46 is formed inside the shield case 45 on the back
surface side. It is disclosed.
[0003]
FIG. 7 is a partially enlarged exploded perspective view showing the positional relationship of the
receiver 44, the wireless circuit 46, the printed circuit board 43 and the shield case 45 shown
above.
[0004]
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1
FIG. 6 shows a general circuit configuration of the wireless circuit 46. As shown in FIG.
As shown in FIG. 6, the radio circuit 46 includes a duplexer 47, an isolator 48, a transmitter 49, a
modulator 50, a transmitter 51, a receiver 52, a demodulator 53, a receiver (not shown), a
controller A transmitter 54, an antenna 55 and a receiver 44 are provided in connection with this
(without the reference number).
[0005]
Next, the operation will be described. The voice added to the transmitter 54 is converted into an
electric signal, amplified by the transmitter 51, then superimposed on the transmission wave by
the modulator 50, passed through the isolator 48 and the duplexer 47, and radiated from the
antenna 55 Be done.
[0006]
After passing through the duplexer 47, the reception wave received by the antenna 55 is
amplified by the reception unit 52, and the demodulation unit 53 demodulates the reception
wave and amplifies the reception wave by the reception unit (without the figure number), and
then the receiver 44. It is converted to voice at.
[0007]
FIG. 5 is a partially enlarged view in the vicinity of the receiver 44. As shown in FIG.
In FIG. 5, the receiver 44 includes a diaphragm 19, a coil 20 fixed to the diaphragm 19, a diskshaped magnet 21 disposed inside the coil 20, a yoke 22 for holding the disk-shaped magnet 21,
and a yoke for holding a magnet 22 together with a frame 23, a lid 24, and a pair of lead wires
57 projecting to the outside, the receiver cushion 26 is compressed by a predetermined amount
and assembled to the upper case 1.
[0008]
The disk-shaped magnet 21 has a south pole on the side facing the yoke 22 and a north pole on
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the opposite side, and the isolator 48 and the receiver 44 do not overlap in plan view.
[0009]
Here, the disk-like magnet 21 of the receiver 44 excites the diaphragm 19 using Fleming's lefthand rule, and the magnet of the isolator 48 is designed to provide a unidirectional tube action
using the Faraday effect.
[0010]
As described above, since both the receiver 44 and the isolator 48 have magnets, they are
deteriorated in performance when they are affected by an external magnetic field. In that case, it
had to be separated by a predetermined amount so as not to overlap.
Alternatively, the receiver 44 not mounted on the surface has to be provided in a direction away
from the printed circuit board 43 so as not to be disposed in the magnetic fields of both.
[0011]
Therefore, the thickness of the device is increased, or the mounting position of the isolator 48 is
restricted, which results in an increase in the size of the shield case 45 covering the isolator 48,
which hinders the downsizing of the device.
[0012]
The present invention has been made in view of the above problems, and an object of the present
invention is to provide magnetic shielding means for preventing the magnetic force of the first or
second magnet from passing through the printed circuit board. An object of the present invention
is to provide a magnetic shielding apparatus capable of reducing the size and thickness of an
apparatus by eliminating the design restriction by preventing the deterioration of the magnet
regardless of the position of the electronic component having the magnet.
[0013]
In order to achieve the above object, the invention according to claim 1 in the present invention
has a printed circuit board, and the first and second magnets provided so as to sandwich the
printed circuit board. It comprises first and second electronic components, and a magnetic
shielding means is disposed between the first and second electronic components.
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[0014]
Therefore, according to the first aspect of the present invention, the magnetic force of the first or
second magnet can prevent the passage of the printed circuit board.
[0015]
According to the second aspect of the present invention, there is provided a printed circuit board,
a first electronic component (isolator) having a first magnet mounted on one side of the printed
circuit board, and the other side of the printed circuit board. A second electronic component
(receiver) having a second magnet is provided, and a magnetic shielding means is disposed
between the printed circuit board and the second electronic component (receiver).
[0016]
Therefore, according to the invention of claim 2, the magnetic force of the magnet of the isolator
or the receiver can prevent the passage of the printed circuit board.
[0017]
According to the third aspect of the present invention, there is provided a printed circuit board, a
first electronic component (isolator) mounted on one side of the printed circuit board and having
a magnet, and the other side of the printed circuit board. A second electronic component
(receiver) having a magnet, and a holding member for holding the second electronic component
(receiver) and formed of a magnetic material, the printed circuit board and the second electronic
component ( The holding member is disposed between the receiver and the receiver.
[0018]
Therefore, according to the third aspect of the present invention, the magnetic force of the
magnet of the isolator or the receiver prevents the passage of the printed circuit board simply by
forming the holding member for holding the receiver with a magnetic body without providing a
special magnetic shielding member. It has the effect of being able to
[0019]
The invention according to claim 4 is a printed circuit board, a first electronic component
(isolator) having a first magnet mounted on one side of the printed circuit board, and the other
side of the printed circuit board A second electronic component (receiver) provided with a
second magnet provided in the housing, a holding member formed of a magnetic material for
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holding the second electronic component (receiver), the printed circuit board and the holding
member And a magnetic shielding means disposed between them.
[0020]
Therefore, according to the invention of claim 4, even if the magnetic force of the magnet of the
isolator or the receiver is large, the magnetic shielding means can prevent the passage of the
printed circuit board.
[0021]
In the invention according to the fifth aspect, the magnetic shielding means is constituted by a
magnet in which the same pole is disposed to one of the first and second magnets.
[0022]
Therefore, according to the invention of claim 5, even if the magnetic force of the magnet of the
isolator or the receiver is large, the magnet can completely prevent the passage of the printed
circuit board.
[0023]
In the invention according to claim 6, the magnet provided as the magnetic shielding means is
fixed by a double-sided adhesive material.
[0024]
Therefore, according to the sixth aspect of the present invention, it is possible to prevent the
movement of the magnet by the action of the repulsive force due to the same poles facing each
other by the adhesive force of the adhesive.
[0025]
According to a seventh aspect of the present invention, there is provided a portable information
device comprising the magnetic shielding device according to any one of the first to sixth
aspects.
[0026]
Therefore, according to the seventh aspect of the invention, although the battery charged with a
limited capacity is mounted, it has an effect of preventing the current consumption from
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increasing by preventing the performance deterioration of the isolator.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
FIG. 1 is a whole block diagram showing an embodiment of the present invention.
Here, it is illustrated as a cross-sectional view of a mobile phone (hereinafter referred to as a
device) provided with the magnetic shielding device of the embodiment of the present invention.
[0028]
In FIG. 1, in a housing formed of an upper case 1 and a lower case 2, a transmitting / receiving
antenna 3, a receiving antenna 4, a receiver 5 for outputting voice, a liquid crystal display unit 6
for displaying characters, symbols, etc. A key sheet 7 on which characters and symbols are
printed, a transmitter 8 and a main body printed circuit board 9 are accommodated, and a
battery 10 for supplying power is mounted outside the casing.
[0029]
In the upper case 1, a sound hole 11 for guiding the voice generated from the receiver 5 to the
outside of the case, a protrusion 12 of the key sheet 7 is inserted, and an opening equal in size to
the key hole 13 and the liquid crystal display 6 The opening 14 is covered with a transparent
window 15 so that the user can recognize and read characters, symbols and the like displayed on
the liquid crystal display unit 6.
[0030]
An oscillator (hereinafter referred to as "VCO") for controlling the transmission frequency by
voltage, a temperature compensated crystal oscillator (hereinafter referred to as "VC-TCXO") for
stably controlling the frequency, a plurality of resistors, a capacitor, etc. The receiver circuit unit
16 is formed of a low noise amplifier, a first mixer, etc., and the transmitter circuit unit 17 is
mounted with a modulator, a power amplifier (hereinafter referred to as PA), an isolator, a
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plurality of resistors, capacitors, etc. It is formed.
The reception circuit unit 16 and the transmission circuit unit 17 are covered with a resin shield
case 18 for preventing the intrusion of electromagnetic waves from the outside.
[0031]
The shield case 18 is formed of a resin material such as acrylonitrile butadiene styrene, etc. The
surface is plated with electroless copper to block the passage of electromagnetic waves, and the
surface is further plated with electroless nickel Anticorrosion treatment of electroless copper
plating is performed.
[0032]
Next, the handset 5 will be described.
FIG. 2 is a partial enlarged view of the vicinity of the handset.
In FIG. 2, the receiver 5 holds the diaphragm 19, the coil 20 fixed to the diaphragm 19, the diskshaped magnet 21 disposed inside the coil 20, the yoke 22 holding the disk-shaped magnet 21,
and the magnet The upper case 1 is composed of a yoke 23, a frame 23, a lid 24, and a pair of
feed terminals 25 protruding to the outside, and the upper case 1 is assembled so that the
receiver cushion 26 is compressed by a predetermined amount. The hook holder 28 is held by a
receiver holder 29 having a hook 28 formed therein.
[0033]
The disk-like magnet 21 has a south pole on the side facing the yoke 22 and a north pole on the
opposite side.
The receiver holder 29 is formed by pressing a sheet metal such as magnetic spring steel (SUP),
magnetic stainless steel plate (for example, SUS 430), silicon steel plate or the like, and the hook
28 is formed by drawing. ing.
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A thin plate magnet 30 containing iron and resin is adhered to the receiver holder 29 by an
adhesive material, and the non-adhesive surface is in contact with the printed circuit board 9.
The thin plate magnet 30 is a double-sided magnetized pattern, and the adhesive surface is an S
pole and the non-adhesive surface is an N pole, and the same poles of the thin plate magnet 30
and the disc magnet 21 are arranged to face each other. ing.
[0034]
In addition, although a rare earth cobalt sintered magnet is generally used as a material of a
magnet, a sintered product is mechanically weak.
This type of portable device is often dropped by the user by mistake, and the impact force at that
time acts on the internal parts, causing damage and disabling the function as a magnet.
[0035]
Therefore, in the present embodiment, a resin magnet compression-formed into a thin plate
shape using a resin material such as Fe--B--R-based quenched fine pieces (R: Nd and / or Pr) and
an epoxy resin as a binder is used.
In addition, because resin is included compared to rare earth cobalt sintered magnets, we
selected those that are relatively light and do not cause weight when used in portable devices.
[0036]
Next, the operation of the handset 5 will be described.
When an electric signal is applied to the coil 20, the disk-shaped magnet 21 and the coil 20
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provided in the magnetic field formed by the disk-shaped magnet 21 follow the rule of Fleming's
left hand, and the disk-shaped magnet 21 fixed does not move. The coil 20 generates a force
corresponding to the electric signal, and this force causes the diaphragm 19 integrally provided
with the coil 20 to vibrate, and this vibration forms a compression wave so that sound is
generated. It has become.
[0037]
FIG. 3 shows a circuit configuration diagram of the mobile phone according to the embodiment
of the present invention.
In FIG. 3, an antenna 31, a duplexer 32, an isolator 33, a transmitter 34, a modulator 35, a
transmitter 36, a transmitter 37, a controller 38, a receiver 39, a demodulator 40, a receiver 41,
a receiver 42. Is equipped.
[0038]
Next, the operation will be described.
The voice applied to the transmitter 37 is converted to an electrical signal and amplified by the
transmitter 36 to an appropriate output.
Next, the electric signal from the transmission unit 36 is superimposed on the transmission wave
by the modulation unit 35, amplified to a sufficient output by the transmission unit 34, and then
passed through the isolator 33 and the duplexer 32, and the transmission wave from the antenna
31 Is emitted.
[0039]
In addition, the received wave received by the antenna 31 is sufficiently amplified by the
receiving unit 39 after passing through the duplexer 32.
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Next, the received wave is demodulated by the demodulation unit 40, appropriately amplified by
the reception unit 41, and converted into voice by the receiver 42.
[0040]
Next, the isolator 33 will be described in detail.
The isolator 33 is provided in the receiving circuit unit 16 and is surface mounted on the back
surface of the printed circuit board 9.
The isolator 33 is disposed at a position overlapping with the handset 5 provided on the opposite
surface, and the upper portion is covered by a shield case 18.
[0041]
The feature of the isolator 33 is a unidirectional tube utilizing the Faraday effect.
An incident wave has a function of rotating a polarization plane by a magnetic force to take out
an output wave, and achieving unidirectionality by appropriately setting the polarization planes
on the input side and the output side.
The isolator 33 takes advantage of this feature and does not transmit the variation in impedance
on the output side to the input side, so it is provided to ensure load variation stability at the time
of antenna transmission. Changes, and the amount of rotation of the polarization plane changes
with the wavelength of the input wave, and the desired action can not be obtained.
[0042]
Therefore, when the receiver 5 and the isolator 33 are disposed in the vicinity with the printed
circuit board 9 in between, either one of them is deteriorated.
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[0043]
In addition, since the copper foil which forms the pattern of the printed circuit board 9 is a
nonmagnetic material, it is effective for shielding electromagnetic waves, but is not effective for
magnetic shielding.
[0044]
Therefore, a receiver holder 29 or a thin plate magnet 30 which is a magnetic body is provided
between the printed board 9 and the receiver 5 so that the magnetic force of the disk-like magnet
21 accommodated in the receiver 5 does not pass through the printed board 9. .
[0045]
Here, experimental results of the inventor will be described.
Table 1 shown below is an experimental result of the correlation between the consumption
current of the mobile phone and the leakage flux from the handset 5 in the embodiment of the
present invention.
[0047]
The above table will be described.
[0048]
State 1 is the state of the mobile phone when the handset 5 is not equipped.
With the consumption current of the state 1 as a reference, the consumption current of each
state described below is indicated by the fluctuation from the state 1.
[0049]
State 2 is a state in which the isolator 33 is mounted at a position overlapping with the handset
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5.
In the state 2, the leakage flux from the receiver 5 was 70 gauss.
[0050]
In state 3, the isolator 33 is mounted at a position overlapping the receiver 5, and the receiver
holder 29, which is a magnetic body, is provided.
In the state 3, the leakage flux from the receiver 5 was 30 gauss.
[0051]
In state 4, the isolator 33 is mounted at a position overlapping the receiver 5, and the thin plate
magnet 30 is provided together with the receiver holder 29, which is a magnetic body.
In the state 3, the leakage flux from the receiver 5 was −10 gauss.
[0052]
That is, the receiver holder 29, which is a magnetic substance, has the function of reducing the
leakage flux from the receiver 5 by 40 gauss. In addition, the thin plate magnet 30 has a function
to reduce the leakage flux from the receiver 5 by 40 gauss.
[0053]
Therefore, according to the experimental results, it is preferable to provide the thin plate magnet
30 together with the magnetic body between the printed circuit board 9 and the receiver 5 when
overlapping, even if the leakage flux is 40 gauss or less. It is understood that deterioration of the
isolator 33 can be prevented by providing the receiver holder 29 which is a magnetic body.
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[0054]
That is, a magnetic flux is interposed between the printed circuit board 9 and the receiver 5 or a
thin plate magnet 30 is provided between the printed circuit board 9 and the receiver 5 so that
the leakage flux from the disk-like magnet 21 of the receiver 5 causes the isolator 33 to
deteriorate. It may be provided so that the same pole as the disk-shaped magnet 21 faces.
[0055]
In this case, although the different pole of the thin plate magnet 30 is opposed to the isolator 32,
by setting the magnetic force of the thin plate magnet 30 to an appropriate value, the leakage
flux from the disc magnet 21 of the receiver 5 and Be offset.
Therefore, the influence of the leakage flux from the different pole of the thin plate magnet 30
applied to the isolator 33 can be eliminated.
[0056]
As described above, according to the present invention, firstly, the printed circuit board and the
first and second electronic components provided so as to sandwich the printed circuit board and
having the first and second magnets. And the magnetic shielding means is disposed between the
first and second electronic components, and the magnetic force of the first or second magnet can
prevent the passage of the printed circuit board. It is possible to prevent the function of the
electronic component from being degraded by utilizing the function of (1), and by this effect, the
arrangement positions of the first and second electronic components can be arbitrarily
determined without design restrictions.
Therefore, in order to miniaturize the apparatus, the influence on the design can be eliminated.
[0057]
Second, the printed circuit board, an isolator mounted on one side of the printed circuit board,
and a receiver provided on the other side of the printed circuit board and having a second
magnet, the printed circuit board and the printed circuit board A magnetic shielding means is
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disposed between the receiver and the receiver, and the magnetic force of the isolator or receiver
magnet can prevent passage of the printed circuit board, thereby preventing degradation of the
function of the isolator or receiver utilizing the function of the magnet. Because of this effect, the
placement positions of these isolators and handsets can be arbitrarily determined without design
restrictions. Therefore, in order to miniaturize the apparatus, the influence on the design can be
eliminated.
[0058]
Thirdly, a printed circuit board, an isolator mounted on one side of the printed circuit board, a
receiver provided with a magnet on the other side of the printed circuit board, and a receiver for
holding the receiver and formed of a magnetic material And the receiver is disposed between the
printed circuit board and the receiver, and the magnetic force of the magnet of the isolator or the
receiver of the receiver can be used without providing a special magnetic shielding member.
Since the passage can be prevented, the function of the isolator or the receiver utilizing the
function of the magnet can be prevented from being deteriorated, and the arrangement position
of these isolators and the receiver can be arbitrarily determined without any design restrictions.
Therefore, in order to miniaturize the apparatus, the influence on the design can be eliminated.
[0059]
Fourth, a printed board, an isolator mounted on one side of the printed board, a receiver
provided on the other side of the printed board, and a holding member formed of a magnetic
material for holding the receiver And the magnetic shielding means is disposed between the
printed circuit board and the holding member, and the magnetic shielding means can prevent
passage of the printed circuit board even if the magnetic force of the magnet of the isolator or
the receiver is large. It is possible to prevent deterioration of the function of the isolator or the
receiver utilizing the action of the magnet, and this arrangement allows the arrangement
positions of these isolators and the receiver to be arbitrarily determined without restriction in
design. Therefore, in order to miniaturize the apparatus, the influence on the design can be
eliminated.
[0060]
Fifth, the magnetic shielding means is a magnet disposed with the same pole facing the magnet
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of the receiver, and even if the magnetic force of the isolator or the magnet of the receiver is
large, the magnet can completely prevent the passage of the printed circuit board Therefore, the
function of the isolator or the receiver utilizing the function of the magnet can be prevented from
being deteriorated, and the arrangement position of the isolator or the receiver can be arbitrarily
determined without any restriction in design due to this effect. Therefore, in order to miniaturize
the apparatus, the influence on the design can be eliminated.
[0061]
Sixth, since the magnet provided as the magnetic shielding means is fixed by the double-sided
adhesive material, the magnet can be prevented from moving by the action of the repulsive force
due to the same pole facing each other, and the magnet is always disposed at the same position.
Therefore, even if the magnetic force of the magnet of the isolator or the handset is large, the
magnet can completely prevent the passage of the printed circuit board, and the function of the
isolator or the handset utilizing the function of the magnet can be prevented from being
deteriorated.
[0062]
Seventh, in a portable information device provided with such magnetic shielding means, a battery
with a limited capacity is mounted, but in order to prevent an increase in current consumption by
preventing the performance deterioration of the isolator, There is no reduction in call time or
standby time.
[0063]
That is, since the capacity of the battery for supplying power to the device is limited, it has an
effect that it is not necessary to shorten the time from charging the battery to emptying, that is,
the use time and the standby time.
[0064]
Furthermore, it is desirable to reduce the size and weight as well as to reduce the size and weight
of this type of device, and this is an obstacle if there is a restriction on the arrangement of parts.
However, since the embodiment of the present invention has the effect of being able to remove
the restriction, it is suitable for this type of device.
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