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JP2002336779

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2002336779
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electromagnetic actuator for use in a cellular phone, pager (registered trademark) or the like for
notifying a call at the time of signal arrival by vibration or sound.
[0002]
2. Description of the Related Art As this type of electromagnetic actuator, one disclosed in WO
99/39843 is known. This electromagnetic actuator is shown in FIG. As shown in FIG. 7, in the
case of the electromagnetic actuator 100, the magnet 105 is disposed in the groove of the yoke
103 in the case 101, and the coil 109 is positioned in the groove through the gap with the
magnet 105 and attached to the diaphragm 107. The yoke 103 is supported by upper and lower
diaphragms 111 and 113 disposed in parallel to the side surface of the housing 101. By applying
a low frequency current to the coil 109, the yoke 103 vibrates by the action of the diaphragms
111 and 112, and a high frequency current is applied to the coil 109 to vibrate the diaphragm
107 to generate high frequency sound. Further, the wedge 115 is disposed radially inward from
the case 101, and the vibration direction of the yoke 103 is regulated in the vertical direction.
[0003]
However, in the above-described technology, since the coil 109 is attached to the diaphragm
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107, the diaphragm 107 is vibrated even when driven by a low frequency current, and a
sufficient vibration output can be obtained. There is a problem that it can not be obtained. On the
other hand, when the rigidity of the diaphragm 107 is controlled to obtain a sufficient vibration
output, the frequency band of the diaphragm 107 that inherently vibrates in the audio frequency
band is limited, and there is a problem that a good sound can not be obtained.
[0004]
In addition, when the wedge 115 for regulating the vibration direction comes in contact with the
yoke 103, there is a problem that the stable vibration is impaired due to the contact friction.
[0005]
Therefore, an object of the present invention is to provide an electromagnetic actuator that can
obtain stable vibration and good sound.
[0006]
The invention according to claim 1 is a vibration coil to which a low frequency current is applied,
a vibration unit, a case for housing these and supporting the vibration coil, and a case. The
diaphragm includes a diaphragm, a voice coil concentrically supported on the diaphragm with
the vibration coil, to which a high frequency current is applied, and an elastic body supporting
the vibration unit with respect to the case. The vibration unit comprises the vibration coil and the
voice. The magnet includes a magnet provided with a gap between the coil and a yoke to which
the magnet is attached, and the N pole and the S pole of the magnet are positioned along the
vibration direction of the vibration unit, for vibration The vibration unit is vibrated by application
of a low frequency current to the coil, and the diaphragm is vibrated by application of a high
frequency current to the voice coil.
[0007]
In the invention according to the first aspect, the magnet in which the N pole and the S pole are
positioned along the vibration direction of the vibration unit forms a magnetic field separately on
the vibration coil side and the voice coil side, When a low frequency current (for example, 100 to
150 Hz) is applied to the vibration coil, the vibration unit vibrates due to the action of the low
frequency current and the magnetic field on the vibration coil side (the yoke and the magnet
vibrate together) As a result, vibration is generated from the electromagnetic actuator.
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2
Similarly, when a high frequency current (e.g., 900 to 8000 Hz) is applied to the voice coil, the
diaphragm vibrates due to the action of the high frequency current and the magnetic field on the
voice coil side to generate a sound from the electromagnetic actuator.
[0008]
The vibration coil is supported by a fixed case, and the vibration unit is supported from the case
via the elastic body, so that stable vibration can be obtained.
In addition, it has both a vibration system consisting of a vibration coil for applying low
frequency current and a vibration unit for low frequency vibration, and a vibration system
consisting of a voice coil for applying high frequency current and a diaphragm high frequency
vibration. Thus, each can be designed independently, so that each efficiency can be increased to
the maximum value, and a sufficient vibration output and a good sound can be obtained.
[0009]
The invention according to claim 2 is a vibration coil to which a low frequency current is applied,
a vibration unit, a case for housing these and supporting the vibration coil, a diaphragm covering
the case, and a diaphragm for the vibration. And an elastic body for supporting the vibration unit
with respect to the case, and the vibration unit provides a gap between the vibration coil and the
voice coil. The magnet is provided with a magnet and a yoke to which the magnet is attached,
and the N pole and the S pole of the magnet are located along the radial direction of the voice
coil, and the low frequency current is applied to the vibration coil The vibration unit vibrates, and
the diaphragm vibrates by the application of a high frequency current to the voice coil.
[0010]
In the invention according to claim 2, the magnet of the vibration unit in which the N pole and
the S pole are positioned along the radial direction of the voice coil (the direction orthogonal to
the vibration direction of the vibration unit) is a vibration coil and a voice coil. When a low
frequency current is applied to the vibration coil, vibration is generated from the electromagnetic
actuator due to the vibration of the vibration unit, and when a high frequency current is applied
to the voice coil, the vibration of the diaphragm causes the electromagnetic vibration to occur.
Sound is generated from the actuator, and the same function and effect as the invention
described in claim 1 is obtained, and both poles of the N pole and the S pole are opposed along
the coil, so both poles of the N pole and the S pole Since the facing area of the coil and the coil
increases, the strength of the magnetic field across the coil can be kept constant even if the
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vibration unit is largely displaced.
[0011]
The invention according to claim 3 is a vibration coil to which a low frequency current is applied,
a vibration unit, a case for housing these and supporting the vibration coil, a diaphragm covering
the case, and a diaphragm for the vibration. And an elastic body for supporting the vibration unit
with respect to the case, and the vibration unit provides a gap between the vibration coil and the
voice coil. The magnet has a magnet arranged and a support for supporting the magnet, and the
N pole and the S pole of the magnet are located along the radial direction of the voice coil, and
the low frequency current is applied to the vibration coil. The vibration unit vibrates, and the
diaphragm vibrates by the application of a high frequency current to the voice coil.
[0012]
In the third aspect of the present invention, the magnet of the vibration unit in which the N pole
and the S pole are positioned along the radial direction of the voice coil (the direction orthogonal
to the vibration direction of the vibration unit) is a vibration coil and a voice coil. When a low
frequency current is applied to the vibration coil, the vibration unit vibrates (the support and the
magnet vibrate together) and vibration occurs from the electromagnetic actuator. When a high
frequency current is applied to the coil, the diaphragm vibrates to generate a sound from the
electromagnetic actuator, and the same effect as that of the second aspect of the invention can be
obtained.
[0013]
The invention according to claim 4 is characterized in that, in the invention according to any one
of claims 1 to 3, the elastic body is interposed between the case and the vibration unit in the
vibration direction.
[0014]
According to the fourth aspect of the invention, when the elastic body is provided in the radial
direction of the voice coil, the vibration unit can be sufficiently provided while achieving the
same function and effect as the invention according to any of the first to third aspects. Because it
is necessary to lengthen the elastic body in order to vibrate it, it is necessary to increase the gap
between the vibration unit and the case in the radial direction of the voice coil, the dead space in
the case becomes large, and the electromagnetic actuator becomes large. turn into.
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On the other hand, by providing the elastic body in the vibration direction of the vibration unit,
the dead space can be occupied by the vibration unit and the mass can be increased, so the gap
between the vibration unit in the vibration direction and the case can not be increased. Also,
since the vibration unit can be sufficiently vibrated and the gap between the vibration unit in the
radial direction of the voice coil and the case can be reduced, space saving in the case can be
achieved, and the electromagnetic actuator can be miniaturized.
[0015]
The invention according to claim 5 is characterized in that, in the invention according to any one
of claims 1 to 4, a shaft is provided for slidably supporting the vibration unit in the vibration
direction.
[0016]
According to the fifth aspect of the present invention, the electromagnetic type can be provided
by providing a shaft that supports the vibration unit so as to be slidable in the vibration direction,
while achieving the same effects as the invention according to any of the first to fourth aspects.
Even when there is an external impact on the actuator, for example, when it is dropped, the
position of the vibration unit can be prevented from being displaced in the radial direction of the
voice coil, and the impact resistance is improved.
Furthermore, regardless of the direction in which the electromagnetic actuator is placed, the
vibration unit is smoothly slid in the axial direction, so that more stable vibration can be
obtained.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will
now be described in detail with reference to the attached drawings.
FIG. 1 is a sectional view showing an electromagnetic actuator according to the present
invention, FIG. 2 is an exploded perspective view of the electromagnetic actuator of FIG. 1, and
FIG. 3 is an example of mounting the electromagnetic actuator in a mobile phone It is sectional
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drawing which shows.
The electromagnetic actuator 1 shown in FIG. 1 is for notifying a carrier of information received
via a mobile phone by vibration or sound.
[0018]
The electromagnetic actuator 1 comprises a vibration coil 10 to which a low frequency current is
applied, a vibration unit 10 comprising a magnet 7, a yoke 9 of magnetic material and a plate 31,
and a shaft supporting the yoke 9 of the vibration unit 10. 11, a case 13 for storing these, a
diaphragm 23 which is a diaphragm fixed at the periphery on the circumferential end face of the
case 13, and a ring-shaped protrusion 23 a of the diaphragm 23, high frequency current is
applied And an upper spring 15 and a lower spring 17 for supporting the yoke 9 of the vibration
unit 10 with respect to the case 13. The vibration unit is applied by applying a low frequency
current to the vibration coil 3 10 vibrates in the axial direction of the shaft 11 (vertical direction
in FIG. 1), and a high frequency current is applied to the voice coil 5 to make the die Fulham 23
is adapted to pronunciation and vibration.
In the present specification, the terms above and below are used for convenience, but this does
not specify the vertical direction.
[0019]
The case 13 includes a cylindrical frame 19 and a cover 21 in which an insertion hole 21 a for
inserting the shaft 11 is formed.
A receiving portion 19a for receiving the upper spring 15 is provided on the inner peripheral
side of the frame 19, and the cover 21 is provided with a plurality of holes 21b for releasing the
fluctuating air pressure.
[0020]
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The lower spring 17, the yoke 9, and the upper spring 15 are disposed in this order on the cover
21, and the upper spring 15 is interposed between the receiving portion 19a of the frame 19 and
the yoke 9, A spring 17 is interposed between the cover 21 and the yoke 9.
The resonance frequency of the vibration system consisting of the spring coefficients of the
upper and lower springs 15 and 17 and the mass of the vibration unit 10 matches the frequency
of the low frequency current applied to the vibration coil 3.
[0021]
In the present embodiment, the upper portion of the upper spring 15 is adhered and fixed to the
receiving portion 19a, the lower portion of the upper spring 15 is adhered to the yoke 9, the
upper portion of the lower spring 17 is adhered to the yoke 9, and the lower portion of the lower
spring 17 is adhered to the cover 21. The vibration unit 10 is fixed relative to the case 13 in the
circumferential direction. Further, by providing the upper and lower springs 15 and 17 on the
upper and lower sides of the yoke 9, the gap between the yoke 9 and the frame 19 can be made
smaller, so space saving in the case 13 can be achieved, and the electromagnetic actuator 1 can
be miniaturized. You can
[0022]
The diaphragm 23 is formed by molding a thin film of a high molecular compound such as
polyethylene into a disk shape, and is fixedly adhered to the upper circumferential portion of the
frame 19. Further, in order to obtain flat natural vibration characteristics in a wide frequency
band, a plurality of cone-shaped moldings are applied, and the portion to which the voice coil 5 is
bonded is formed as a protrusion 23a by projecting in a ring shape. ing. The protrusion 23 a
protrudes toward the gap between the yoke 9 and the magnet 7, and in order to prevent the
vibrating coil 5 from colliding with the diaphragm 23 when the vibrating unit 10 vibrates in the
vertical direction. It is provided. In the compact electromagnetic actuator 1, the intrinsic basic
(lowest) frequency of the diaphragm 23 is a high frequency around 1 kHz, so the current applied
to the voice coil 5 is called a high frequency current.
[0023]
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The yoke 9 is provided with an outer peripheral wall 25, a central projection 27 in which an
insertion hole 27a for inserting the shaft 11 is formed, and a groove 29 formed between the
central projection 27 and the outer peripheral wall 25. It is done. The yoke 9 is slidable in the
axial direction of the shaft 11 by the shaft 11 inserted into the insertion hole 27 a of the central
protrusion 27. The surface of the shaft 11 is made of polytetrafluoroethylene, and the yoke 9 can
slide smoothly in the axial direction with respect to the shaft 11.
[0024]
By providing the shaft 11 for slidably supporting the yoke 9, the position of the yoke 9 is such as
when the electromagnetic actuator 1 is dropped, for example, even when an external impact is
applied to the electromagnetic actuator 1. It is possible to prevent displacement toward the
central projection 27 or the outer peripheral wall 25 (in the lateral direction in FIG. 1), to
improve impact resistance, and to restrict the vibration direction of the vibration unit 10 in the
axial direction.
[0025]
In the groove 29 of the yoke 9, the magnet 7 and a plate 31 made of a magnetic material are
arranged in this order.
A recess 29 a is formed on the bottom of the groove 29 of the yoke 9, and an engagement groove
31 a is formed on the plate 31. The magnet 7 is positioned in the recess 29 a and is also formed
on the engagement groove 31 a of the plate 31. It is engaged. The annular width of the plate 31
is larger than the annular width of the magnet 7 and forms magnetic gaps on the magnetic paths
A and B by the magnet 7.
[0026]
A gap is provided between the plate 31 and the central projection 27 of the yoke 9 to place the
voice coil 5, and a gap is provided between the plate 31 and the outer peripheral wall 25 of the
yoke 9 to form the vibration coil 3. The vibration coil 3 and the voice coil 5 are provided
concentrically. In the present embodiment, the vibration coil 3 and the voice coil 5 are connected
to two or four of the plurality of terminals provided in the mobile phone so that a current can be
applied. It has become.
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[0027]
As shown in FIG. 3, the electromagnetic actuator 1 sandwiches and fixes the upper and lower
circumferential end faces between the substrate 4 and the housing 6 through the annular seat 2
made of a material such as plastic, respectively. The substrate 4 is provided with a vent 4a, and
the housing 6 is provided with an acoustic radiation hole 6a to provide a relief for internal air
that is compressed and vibrated, and to fix the frame 19 of the electromagnetic actuator 1 to a
mobile phone.
[0028]
In the present embodiment, an N pole is provided on the plate 31 side of the magnet 7 disposed
with a gap between the vibration coil 3 and the voice coil 5, and an S pole is provided on the
yoke 9 side of the magnet 7. The N pole and the S pole of the magnet 7 are located in the axial
direction of the shaft 11 (the vibration direction of the vibration unit 10), forming a magnetic
path A on the vibration coil 3 side, and the magnetic path on the voice coil 5 side. It forms B. The
yoke 9 and the plate 31 are magnetic bodies of low magnetic resistance.
[0029]
Next, based on the configuration described above, the operation of the present embodiment will
be described. To assemble the electromagnetic actuator 1, the magnet 7 is positioned in the
recess 29 a of the groove 29 of the yoke 9, and the plate 31 is attached on the magnet 7 to
assemble the vibration unit 10. Next, the upper spring 15 and the lower spring 17 are fixed
(bonded) to the upper and lower surfaces of the outer peripheral wall 25 of the yoke 9,
respectively. Subsequently, the vibration coil 3 is fixed to the frame 19, and the upper spring 15
fixed to the vibration unit 10 is fixed to the upper bottom surface of the receiving portion 19 a of
the frame 19.
[0030]
Then, the shaft 11 is inserted into and fixed to the insertion hole 27 a of the yoke 9 and the
insertion hole 21 a of the cover 21, and the cover 21 is the frame 19 while the lower spring 17
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fixed to the vibration unit 10 is fixed to the cover 21. Stick to The lead wire of the vibration coil 3
is connected to the terminal portion 8 of the frame 19 along the lower surface of the diaphragm
23 along the upper surface of the frame 19.
[0031]
In the electromagnetic actuator 1, when a low frequency current (for example, a single frequency
of 100 to 150 Hz as a perceived frequency) is applied to the vibration coil 3 from the circuit in
the mobile phone, the low frequency current and the vibration The vibration unit 10 vibrates in
the axial direction of the shaft 7 by the action of the magnetic field of the gap on the magnetic
path A on the coil 3 side. When the vibration unit 10 vibrates, the mobile phone fixing the frame
19 vibrates and transmits information such as an incoming call signal to the carrier.
[0032]
In the present embodiment, the mass of the vibration unit 10 and the resonance frequency of the
vibration system including the upper and lower springs 15 and 17 are matched with the
frequency of the low frequency current supplied, and transfer from electromagnetic energy to
kinetic energy Is efficient. The yoke 9 plays a role of increasing the mass of the vibration unit 10,
and the plate 31 forms a magnetic gap on the magnetic paths A and B.
[0033]
When a high frequency current (for example, a wide frequency of 900 to 8000 Hz as an audio
frequency) is applied to the voice coil 5, the diaphragm 23 is in a high frequency band due to the
action of the high frequency current and the magnetic field of the gap on the magnetic path B.
Cause vibration. The diaphragm 23 is a diaphragm in which a thin film material such as
polyethylene is formed into a cone shape, so that the acoustic radiation is faithful to the driving
force in the high frequency band via the voice coil 5. When the diaphragm 23 vibrates, high
frequency sound transmits information such as an incoming call signal to the wearer through the
acoustic radiation hole 6a of the casing 6 of the mobile phone fixing the frame 19.
[0034]
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10
In the present embodiment, the vibration unit 10 is vibrated by the electromagnetic force of the
magnetic field of the gap between the vibrating coil 3 fixed to the frame 19 and the magnetic
path A. That is, since the vibration system is formed independently (independently) of the
vibration of the diaphragm 23, a stable vibration output can be obtained without being affected
by the complicated vibration of the diaphragm 23 itself.
[0035]
Here, regardless of the orientation of the mobile phone, the vibration unit 10 must be moved in
one direction in the vertical direction (axial direction), and even if a lateral impact is applied due
to an external factor, Although it is necessary to vibrate the vibration unit 10 in the axial
direction, in the present embodiment, since the shaft 11 having a polytetrafluoroethylene
processed on the surface is inserted through the center of the vibration unit 10, vibration is
generated by stable sliding friction. The direction can be restricted in one axial direction.
Therefore, as in the case where the weir 115 is provided in the case 101 shown in the
conventional example of FIG. 7, the inconvenient phenomenon in which the weir 115 and the
yoke 103 contact and disturb smooth vibration does not occur.
[0036]
Also, two vibrations of a vibration system comprising a vibration coil 3 applying a low frequency
current and a vibration unit 10 vibrating a low frequency, and a vibration system comprising a
voice coil 5 applying a high frequency current and a diaphragm 23 vibrating a high frequency.
Since the system is formed, it can be designed independently of the vibration coil 3 for low
frequency vibration and the voice coil 3 for high frequency band acoustic system, and the
current drive circuit matched to the respective load characteristics The vibration output
efficiency and the acoustic radiation efficiency can be raised to their respective maximum values
by designing.
[0037]
In addition, it is not necessary to increase the vibration output efficiency and the acoustic
radiation efficiency to the maximum value, and if one current drive circuit, the vibration coil 3
and the voice coil 5 are designed to fall within an appropriate range, the vibration coil 3 and the
voice coil 5 may be connected in series or in parallel to constitute the electromagnetic actuator 1
having two input terminals.
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11
That is, the degree of freedom can be increased in the connection method with the drive circuit in
the mobile phone. A part of the ring-shaped frame body 19 is projected outward as the terminal
portion 8 and is used for connection with the current drive circuit of the mobile phone.
[0038]
Next, other embodiments will be described, but in the description, the same parts as those
described above are denoted by the same reference numerals, and the description thereof will be
omitted.
[0039]
FIG. 4 is a cross-sectional view showing the electromagnetic actuator according to the second
embodiment.
In the second embodiment, as shown in FIG. 4, the case 13 includes a housing 37 and an upper
cover 12 attached to the housing 37, and the lower part of the upper cover 12 is an outer
periphery of the housing 37. The diaphragm 23 is fixed on the portion. A storage groove 39 is
formed in the central portion of the storage body 37 and a plurality of holes 14 are provided.
Similarly, a plurality of holes 16 are provided in the upper cover 21 as well.
[0040]
A shaft 11 that is a magnetic body is attached to a substantially central portion of the bottom
surface of the storage groove 39. A nonmagnetic support 33 to which the magnet 7 is attached is
attached to the shaft 11, and the support 33 is slidable in the axial direction of the shaft 11. The
vibration unit 10 includes the magnet 7 and the support 33. Are configured. A lower spring 17
that biases the magnet 7 toward the support 33 is disposed on the bottom surface of the storage
groove 39. Further, a pressing member 35 positioned above the support 33 and pressing the
support 33 toward the lower spring 17 is attached to the shaft 11.
[0041]
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12
In the present embodiment, a gap is provided between the magnet 7 and the shaft 11 to arrange
the vibration coil 3, and a gap is provided between the magnet 7 and the side wall 39 a of the
storage groove 39 to form the voice coil 5. Is arranged. The N pole is on the shaft 11 side of the
magnet 7, and the S pole is on the side wall 39 a side of the magnet 7, and the N pole and the S
pole of the magnet 7 are in the left-right direction in the figure. The magnetic path C is formed
across the vibration coil 3 and the voice coil 5 in the radial direction of the (the direction
orthogonal to the vibration direction of the vibration unit 10).
[0042]
In the second embodiment, when a low frequency current is applied to the vibration coil 3, the
action of the low frequency current and the magnetic field of the inner gap (between the shaft 11
and the magnet 7) on the magnetic path C. When the vibration unit 10 vibrates in the axial
direction (vertical direction in FIG. 3) of the shaft 7, vibration is generated from the
electromagnetic actuator 1, and when a high frequency current is applied to the voice coil 5, this
high frequency current The diaphragm 23 is vibrated by the action of the magnetic field of the
outer gap (between the magnet 7 and the side wall 39a of the storage groove 39) on the
magnetic path C, and the electromagnetic actuator 1 generates a sound.
[0043]
FIG. 5 is a cross-sectional view showing an electromagnetic actuator according to a third
embodiment.
In the third embodiment, as shown in FIG. 5, a central projection 41 projecting toward the upper
cover 12 is formed from the bottom surface of the storage groove 39 of the case 13, and the
central projection 41 and the magnet 7 A gap is provided therebetween to arrange the voice coil
5, and a gap is provided between the magnet 7 and the side wall 39 a of the storage groove 39 to
arrange the vibration coil 3.
[0044]
Further, an upper support plate 43 is provided in the storage groove 39 in the radial direction of
the voice coil 5 (parallel to the bottom surface of the storage groove 39), and between the upper
support plate 43 and the magnet 7, an upper spring 15 is provided. The lower spring 17
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intervenes between the magnet 7 and the bottom surface of the storage groove 39. The positions
of the N pole and the S pole of the magnet 7 are the same as in the second embodiment, and a
magnetic path C is formed across the vibration coil 3 and the voice coil 5.
[0045]
In the third embodiment, when a low frequency current is applied to the vibration coil 3, the low
frequency current and the magnetic field of the outer gap on the magnetic path C sandwich the
upper and lower springs 15 and 17. When the magnet 7 vibrates in the axial direction (vertical
direction in FIG. 4) of the central protrusion 41, vibration is generated from the electromagnetic
actuator 1, and a high frequency current is applied to the voice coil 5, By the action of the high
frequency current and the magnetic field of the inner gap on the magnetic path C, the diaphragm
23 vibrates to generate a sound from the electromagnetic actuator 1.
[0046]
FIG. 6 is a cross-sectional view showing an electromagnetic actuator according to the fourth
embodiment.
In the fourth embodiment, as shown in FIG. 6, a vibration unit 10 configured of a yoke 9, a
magnet 7 and a plate 31 is provided in a case 13, and the yoke 9 has an outer peripheral wall 25
and The groove portion 29 is formed, and the magnet 7 and the plate 31 are disposed in this
order on the bottom surface of the groove portion 29. A diaphragm 23 to which a coil 45 is
attached is adhered to the upper circumferential portion of the case 13.
[0047]
The vibrating unit 10 is vertically supported by the upper spring 15 and the lower spring 17 and
housed in the case 13, and is slidably supported by the shaft 11. The shaft 11 is inserted into an
insertion hole 29 a formed on the bottom of the groove 29, an insertion hole 7 a formed on the
magnet 7, and an insertion hole 31 a formed on the plate 31. An upper stopper 11 a and a lower
stopper 11 b are provided on the shaft 11 at intervals in the vibration unit 10 to restrict the
movement of the vibration unit 10 in the vertical direction.
[0048]
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14
In addition, a coil is provided between the magnet 7 and the outer peripheral wall 25 to which a
low frequency current or / and a high frequency current is applied by providing a gap, and the
coil 45 is a vibration in the above embodiment. For the coil and the voice coil. In the present
embodiment, there is an S pole on the diaphragm 23 side of the magnet 7 and an N pole on the
cover 21 side, and the N pole and the S pole of the magnet 7 are positioned in the axial direction
of the shaft 11 , The magnetic path D is formed.
[0049]
In the fourth embodiment, the vibration system consisting of the vibration unit 10 and the upper
and lower springs 15 and 17 resonates at a low frequency, and the natural frequency of the
diaphragm 23 resonates at a high frequency wide band. Therefore, when a low frequency current
is applied to the coil 45, the vibration unit 10 vibrates in the axial direction of the shaft 11 by the
action of the low frequency current and the magnetic field of the gap on the magnetic path D.
When a high frequency current is applied to the coil 45, the diaphragm 23 vibrates by the same
electromagnetic force, and a sound is generated from the electromagnetic actuator 1.
[0050]
The present invention is not limited to the embodiments described above, and various
modifications can be made without departing from the scope of the invention. For example, in the
first embodiment, the upper and lower springs 15 and 17 are adhered to the upper and lower
surfaces of the receiving portion 19a, the upper and lower surface of the yoke 9 and the cover
21 respectively, but the upper and lower springs 15 and 17 are not adhered When the vibration
unit 10 is supported by the pressing support, the resonance frequency of the low frequency
vibration system can be reduced by the sliding of the pressing portion.
[0051]
In the first embodiment, if the frame 19 is integrated with all or part of the cover 21, the upper
and lower springs 15 and 17 and the shaft 11 can be supported under the support of the
integrated structure. Can be provided, and the structure to be fixed can be made rigid.
[0052]
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15
Further, in the first embodiment, the magnet 7 having magnetic poles in the vertical direction
and the magnet portion of the plate 31 are replaced with magnets 7 having N poles and S poles
in the radial direction as shown in FIGS. 4 and 5. Also good.
This makes it possible to increase the facing area of the magnet and the coils 3 and 5 in the
magnetic gap.
[0053]
In the first, second and fourth embodiments, the shaft 11 may be integrated with the case 13 to
reduce the number of parts.
[0054]
Although the electromagnetic actuator 1 is used for a mobile phone in the present embodiment,
the present invention is not limited to this. For example, even if it is used for a pager or a pager,
the same function and effect can be obtained.
[0055]
According to the first aspect of the present invention, the vibration coil is supported by the fixed
case, and the vibration unit is supported from the case via the elastic body, so that stable
vibration can be obtained. be able to.
In addition, it has both a vibration system consisting of a vibration coil for applying low
frequency current and a vibration unit for low frequency vibration, and a vibration system
consisting of a voice coil for applying high frequency current and a diaphragm high frequency
vibration. Thus, each can be designed independently, so that each efficiency can be increased to
the maximum value, and a sufficient vibration output and a good sound can be obtained.
[0056]
According to the second aspect of the invention, the same effect as that of the first aspect of the
invention can be obtained, and the opposing area of the magnetic gap to which the
electromagnetic force is applied becomes large. The strength of the crossing magnetic field can
13-05-2019
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be kept constant.
[0057]
The invention described in claim 3 has the same effect as that of the invention described in claim
2.
[0058]
According to the invention of claim 4, the same effects as those of the invention according to any
of claims 1 to 3 can be obtained, and by providing an elastic body in the vibration direction of
the vibration unit, the vibration unit in the vibration direction and the case As the support can be
vibrated sufficiently and the gap between the vibration unit in the radial direction of the voice
coil and the case can be reduced without increasing the gap between the two, space saving in the
case can be achieved, and the electromagnetic actuator Can be made smaller.
[0059]
The invention according to claim 5 exerts the same effect as the invention according to any one
of claims 1 to 4, and provides impact resistance by providing a shaft for slidably supporting the
vibration unit in the vibration direction. As well as improving, regardless of the direction in which
the electromagnetic actuator is placed, the vibration unit is smoothly slid in the axial direction, so
that more stable vibration can be obtained.
[0060]
Brief description of the drawings
[0061]
1 is a cross-sectional view showing an electromagnetic actuator according to the present
invention.
[0062]
2 is an exploded perspective view of the electromagnetic actuator of FIG.
[0063]
3 is a cross-sectional view when the electromagnetic actuator of FIG. 1 is mounted in a mobile
phone.
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17
[0064]
4 is a cross-sectional view showing an electromagnetic actuator according to a second
embodiment.
[0065]
5 is a cross-sectional view showing an electromagnetic actuator according to a third embodiment.
[0066]
6 is a cross-sectional view showing an electromagnetic actuator according to a fourth
embodiment.
[0067]
7 is a cross-sectional view showing a conventional electromagnetic actuator.
[0068]
Explanation of sign
[0069]
Reference Signs List 1 electromagnetic actuator 3 vibration coil 5 voice coil 7 magnet 9 yoke 10
vibration unit 11 shaft 13 case 15 upper spring (elastic body) 17 lower spring (elastic body) 23
diaphragm 33 support body
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