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JP4491529

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DESCRIPTION JP4491529
Electromagnetic actuator and its mounting structure
The present invention relates to an electromagnetic actuator incorporated in a portable
electronic device such as a pager or a telephone, as a call notification means for notifying a call
upon signal arrival by a buzzer sound, voice or vibration, and to an attachment structure thereof.
. BACKGROUND OF THE INVENTION In portable electronic devices such as pagers and
telephones, a call notification device having a vibrator in addition to a buzzer is provided so as to
be suitable for notifying an incoming call at a place where it is difficult to send out an alarm
sound such as during a meeting. There is something to do. If the output mode of the alarm sound
is switched to the vibration mode in advance, instead of outputting the alarm sound when a call
is received, the call can be sensed by the vibration accompanying driving of the vibrator.
Conventionally, as such a vibrator, a small motor provided with an eccentric weight or the like on
a rotating shaft is used, and it is configured to generate a vibration by driving a motor and
rotating the rotating shaft. With the demand for smaller and lighter portable electronic devices
such as pagers and telephones, further miniaturization of the motor has been promoted, but in
the call notification device having a buzzer together with this vibrator, the entire device is
miniaturized There is a limit to In addition, since the amount of vibration is constant due to
battery operation, there is also a disadvantage that the feeling of the strength of the transmission
of the vibration differs depending on individual differences. In order to solve this, the present
inventors developed a speaker type electromagnetic actuator which does not use a small motor
of US Patent 5,528, 697. The electromagnetic actuator is a ground-breaking product that can
simultaneously use the function of selecting vibration call, buzzer call or voice call vibration
mode and the speaker function, and applies a predetermined frequency current to the coil to
make the magnetic field of the magnet Due to the action of the current applied to the coil,
vibration is generated from the diaphragm at low frequencies, and resonance sound can be
generated from the diaphragm at high frequencies. Moreover, since the amount of vibration and
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the frequency can be controlled, the amount of vibration can be adjusted and set to a desired
level of the individual. By the way, along with the generalization of portable electronic devices, an
electromagnetic actuator is required to suppress external leakage of magnetic flux and to have
good frequency characteristics even in a small size. In addition, in the use environment of a
portable electronic device in which an electromagnetic actuator is installed, a device having high
impact resistance that is not broken even if the user drops it is required. Furthermore, in order to
achieve cost reduction, reduction in the number of parts and ease of assembly are required.
SUMMARY OF THE INVENTION The present invention comprises a coil to which current is
applied, a magnet which separates a magnetic gap between a magnetic yoke and a magnetic
circuit to form a magnetic circuit between magnetic poles, and a diaphragm which vibrates by
magnetic action accompanying high frequency current application. An electromagnetic actuator
having a compact and simple configuration that includes a diaphragm that vibrates due to the
magnetic action caused by the application of a low frequency current, the coil is disposed in the
magnetic gap, and the components are accommodated inside the housing. Further improve the
mounting structure of the electromagnetic actuator. One object of the present invention is to
suppress external leakage of magnetic flux. In order to achieve the object, the present invention
comprises a magnet of radial orientation type, a diaphragm of double suspense structure, a case
having a magnetic shielding function, and the like. Another object of the present invention is to
construct a compact electromagnetic actuator having good frequency characteristics. In order to
achieve the object, the present invention selects the material of the diaphragm, and in addition to
the diaphragm and the diaphragm, a housing is provided as a third vibrator. A further object of
the present invention is to construct an electromagnetic actuator having high impact resistance.
In order to achieve the object, the present invention is configured to include an elastic member
for pressing and supporting the diaphragm within the housing. Further, the present invention
aims at achieving cost reduction, and the present invention is configured by including a
diaphragm for supporting the coil by the convex portion and a diaphragm for supporting the
magnetic yoke at the plate surface together with the magnet. is there. Another object of the
present invention is to further improve frequency characteristics and impact resistance from the
mounting structure of the electromagnetic actuator, and the present invention is added between
the housing of the electromagnetic actuator and the housing case of the portable electronic
device. The elastic packing is also provided between the housing of the electromagnetic actuator
and the mounting substrate. DETAILED DESCRIPTION OF THE INVENTION The present invention
will be described in detail with reference to the drawings. The electromagnetic actuator
according to the present invention comprises a first vibrator 1 that generates a resonance by
application of a high frequency current as shown in FIG. A second vibrator 2 that generates
vibration by application of a frequency current, and a housing 3 that accommodates the first and
second vibrators 1 and 2 as at least necessary assembly parts There is. As shown in FIG. 2, the
first vibrating body 1 is a voice coil 10 (hereinafter simply referred to as a "coil") wound in a ring
shape to which a high frequency or low frequency current is selectively applied.
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And a thin-plate shaped diaphragm 11 carrying this coil 10. The diaphragm 11 is formed in a
thin plate-like disc shape from a resin material such as polyether imide (PEI). The projection 11 is
concentrically provided on the diaphragm 11 so as to protrude from the plate surface so as to
have an annular end face to which the coil 10 can be fixed at a predetermined projecting height.
In addition to this, on the plate surface of the diaphragm 11, a rib 11d having an annular shape
is provided concentrically on the outer circumferential side plate surface so as to separate the
vibrating portion 11b and the outer peripheral edge portion 11c required for assembly fixation
to the housing 3. It is done. The coil 10 is supported by the diaphragm 11 by being fixedly
attached to the convex portion 11 a provided on the plate surface of the diaphragm 11.
According to the configuration of the first vibrator 1, since a separate support member for
carrying the coil 10 is not first required, the number of parts can be reduced and the coil 10 can
be easily equipped. Further, since the diaphragm 11 is attached and fixed to the convex portion
11a where the coil 10 protrudes from the plate surface of the vibrating portion 11a, the vibrating
portion 11b is not affected by the installation of the coil 10 and maintains good frequency
characteristics. Can. As shown in FIG. 3, the second vibrator 2 comprises a magnet 20 for
forming a magnetic circuit, a magnetic yoke 21 for holding the magnet 20, and a thin plate-like
diaphragm 22 for supporting the magnetic yoke 21. It is done. The magnet 20 is provided with a
radial orientation type. The radially oriented magnet 20 is magnetized in such a manner that the
N pole and the S pole are divided into an inner peripheral side and an outer peripheral side, and
the magnetic circuit is radially formed between the magnetic poles. The magnet 20 is assembled
integrally with the magnetic yoke 21 so as to be fitted inside the magnetic yoke 21 and to
position the N pole and the S pole in parallel with the first and second vibrators 1 and 2. The
magnet 20 is divided into a plurality of four equal parts so that the magnet 20 can be easily
fitted into the magnetic yoke 21. The magnetic yoke 21 is in the shape of a saucer having an
outer peripheral wall 21a, and a pole piece 21b is raised and formed at the inner center. The pole
piece portion 21 b is provided as a rising portion smaller in diameter than the inner periphery of
the magnet 20 so as to separate the magnetic gap G (see FIG. 1) from the inner periphery of the
magnet 20. The diaphragm 22 is formed by stamping and forming a springy metal thin plate, and
the central plate portion 22a for mounting and fixing the magnetic yoke 21, the outer peripheral
portion 22b required for assembling and fixing to the housing 3, and the both are connected It is
formed in the structure rich in spring property from the plurality of curved arm portions 22c.
Since the second vibrator 2 is provided with the magnet 20 of radial orientation type, the
magnetic force of the magnet 20 and the magnetic force generated by the coil 10 attract and
repel the diaphragm 11 which vibrates by the repulsion action with respect to the vibration
direction of the diaphragm 22. External leakage of magnetic flux can be suppressed. Further, as
with the configuration of the first vibrating body 1, no separate support member for supporting
the magnetic yoke 21 is required, so that the number of parts can be reduced and the magnet 20
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and the magnetic yoke 21 can be easily assembled. . In order to secure a space in which the coil
10 can penetrate deep into the magnetic gap G inside the magnetic yoke 21, the spacer 24 is
assembled with the magnet 20 interposed therebetween. In the second vibrating body 2, in
addition to the above-described diaphragm 22, a central plate portion 23 a similar to the
diaphragm 22, an outer peripheral edge portion 23 b required for assembling and fixing to the
housing 3, and Another diaphragm 23 formed of a plurality of curved arm portions 23c to be
connected is provided. The central hole 23 d of the diaphragm 23 is larger than the outer
diameter of the coil 11 so that the coil 10 can be disposed inside the magnetic gap G. The second
vibrating body 2 has a double suspension structure by providing the two vibration plates 23, and
the magnetic shieldability is further improved, and the external leakage of the magnetic flux can
be more effectively suppressed. In addition, since the vibration resistance is improved, the initial
vibration characteristics can be maintained favorably. Each of the diaphragms 22 and 23 may be
formed of either an alloy of copper and titanium which does not require age hardening after
processing or a stainless steel. With the diaphragms of these materials, the hardness / Young's
modulus as a spring member is increased, so that the resonance frequency can be raised to
generate a large amount of vibration. In order to position and fix the diaphragms 22 and 23
inside the housing 3, a plurality of notches 22d and 23e are provided at regular intervals of the
outer peripheral edge portions 22b and 23b. As shown in FIG. 4, the housing 3 includes a
housing body 30 housing the first and second vibrators 1 and 2 inside, a cover plate 31 covering
the upper side of the housing body 30, and a housing A thin plate-like bottom plate 32 covering
the bottom side of the main body 30 is formed as a disc-like housing body. The casing body 30 is
formed in a circular frame shape from a resin material such as polyether imide (PEI). A stepped
portion 30 a for receiving the cover plate 31 is provided on the inner peripheral surface thereof
along with the outer peripheral edge portion 11 c of the diaphragm 11. Further, on the lower
side of the step portion 30, a protrusion 30b (only one is shown in FIG. 4) with which the notches
22d and 23e of the diaphragms 22 and 23 described above are fitted is provided.
In addition, an air vent hole 30 c is provided in the side wall of the casing body 30, and a notch
30 d is provided in the upper edge for lead-out of the flexi substrate electrically connected to the
coil 10. The cover plate 31 has a disk shape, and a plurality of sound output holes 31a, 31b,...
The cover plate 31 may be formed of a magnetic metal material so as to function as a magnetic
shield plate. The bottom plate 32 doubles as a part of the housing 3 and is formed to function as
a thin plate-like diaphragm from a resin material of polyethylene terephthalate (PET),
polyetherimide (PEI) or polyimide (PI). . The thickness is preferably 50 μm to 100 μm. When
the bottom plate 32 is provided, three vibrators are provided as an electromagnetic actuator, and
the frequency characteristics are further improved including the first and second vibrators 1 and
2. In addition, at least one rib 32a, 32b may be provided concentrically on the temporary surface,
and the frequency characteristics of the bottom plate 32 can be efficiently improved by the ribs
32a, 32b. The housing 3 is provided with an elastic member 33 formed of a rubber-based
elastomer or the like. The elastic member 33 is formed of a cylindrical outer peripheral wall 33a
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fitted to the inside of the casing main body 30, and a convex 33b projecting inward from the
outer peripheral wall 33a. The convex portion 33b of the elastic member 33 can be formed as a
convex line continuous in the circumferential direction, or can be divided and formed into a
plurality of three or four equal parts. The upper edge of the elastic member 33 is also provided
with a notch 33 c fitted with the protrusion 30 b of the housing body 30. In addition to the
elastic member 33, the housing 3 is provided with a spacer ring 34 for securing a vibration space
between the vibration plate 22 of the second vibrating body 2 and the bottom plate 32 of the
housing 3. In each part of the housing 3, as shown in FIG. 1, the elastic member 33 supports the
second vibrating body 2 by receiving the outer peripheral edge 22b of the diaphragm 22 at its
lower end face and sandwiching it with the spacer ring 34. At the same time, the outer peripheral
edge portion 23b of the diaphragm 23 is held by the upper end face to be held between the step
portion 30b of the casing main body 30 and the diaphragm. By providing the elastic member 33
inside the housing 3, even if the user drops the portable electronic device in which the
electromagnetic actuator is installed, the elastic member 33 transmits the impact force directly to
the second vibrator 2. Can be buffered. Further, since the convex portion 33b is located adjacent
to the outer periphery of the magnetic yoke 11, the convex portion 33b as a stopper hits the
outer peripheral surface of the magnetic yoke 11 even if the second vibrating body 2 tries to
swing laterally due to an impact. , Prevent the diaphragms 22 and 23 from twisting and bending.
Therefore, high impact resistance can be provided so that the electromagnetic actuator is not
broken. In order to assemble the entire actuator from the above-described portions, as shown in
FIG. 5, the case body 30 is used as a base so that the coil 11 is received in advance by the
stepped portion 30a It may be fitted into the upper opening edge from the upper side of 30.
Further, the end of the coil 10 can be electrically connected and fixed in advance with the flexi
substrate 4 which is mounted so as to project outward from the outer peripheral edge of the
diaphragm 11 while maintaining a length sufficient to allow the diaphragm 11 to vibrate. . On
the other hand, from the lower side of the case body 30, the notch 23e is aligned with the
projection 30b of the case body 30, and the upper diaphragm 23 of the second vibrating body 2
is fitted. The elastic member 33 is fitted into the inside of the housing body 30 in alignment with
the projection 30b of the main body 30, and the upper diaphragm 2 of the second vibrating body
2 is assembled so as to be pushed in and supported by the outer peripheral edge portion 23b.
Subsequently, the magnetic yoke 21 holding the spacer 24 and the magnet 20 is attached in
advance to the plate surface of the lower diaphragm 22, and the lower diaphragm 22 is fitted
inside the casing main body 30, and the lower diaphragm 22 is The spacer ring 34 which presses
between the lower end surface of the elastic member 33 may be inserted, and the bottom plate
32 may be inserted into the lower opening edge. In the assembled state of the actuator, as shown
in FIG. 1, the first vibrating body 1 and the second vibrating body 2 face each other, and the coil
10 is moved from the central hole 23 d of the upper vibrating plate 23 to the inner periphery of
the magnet 20. Within the magnetic gap G separated from the pole piece portion 21 b of the
magnetic yoke 21, it is configured to be able to be attracted and repelled in the upper and lower
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directions. In this electromagnetic actuator, when a predetermined frequency is applied to the
coil 10, the magnetic action of the magnetic field of the magnet 20 and the applied current of the
coil 10 generates vibrations from the diaphragms 22 and 23 at low frequencies and vibrates the
diaphragm at high frequencies. Can generate resonance sound. In addition, since the amount of
vibration and the frequency can be controlled, the amount of vibration can be adjusted to an
individual's desired level. When this electromagnetic actuator is mounted on a portable electronic
device, the ring-shaped elastic packing is usually positioned between the inner surface of the
device case and the housing of the electromagnetic actuator so as to surround the sound output
hole on the inner side of the device case. It has been practiced to fix the electromagnetic actuator
inside the device case by sandwiching it.
In the mounting structure of the electromagnetic actuator according to the present invention, as
shown in FIG. 6, the ring-shaped elastic packing 5 is positioned so as to surround the sound
emitting hole E, and the inner surface of the device case C and the electromagnetic actuator A
The elastic packing 7 is also interposed between the plate surface of the mounting substrate 6
for housing and fixing the electromagnetic actuator A inside the device case C and the housing 3
of the electromagnetic actuator A while being sandwiched between the housing 3 and the
housing C. By mounting, the electromagnetic actuator A is configured to be accommodated and
fixed in the inside of the device case C. As the elastic packing 5 and 7, what was formed from
resin materials, such as foaming urethane, can be used. Among them, the elastic packing 7
interposed between the mounting board 6 and the plate surface has a circular frame-shaped
outer peripheral wall 7a as shown in FIG. 7 and an elastic base 7b extending inward of the outer
peripheral wall 7a. Can be equipped with The elastic packing 7 is fitted integrally with the
electromagnetic actuator A by fitting the outer peripheral wall 7a to the outside of the bottom of
the case body 30 as shown in FIG. 6 and placing the elastic base 7b against the plate surface of
the mounting substrate 6 The elastic base 7 b is interposed between the plate surface of the
mounting substrate 6 and the housing 3 of the electromagnetic actuator A by sandwiching and
supporting the plurality of hooking claws 6 a and 6 b provided on the mounting substrate 6. The
electromagnetic actuator A can be accommodated and fixed in the inside of the device case C. On
the bottom side of the electromagnetic actuator A, as shown in FIG. 6, a hole 6c is provided on
the plate surface of the mounting substrate 6, and as shown in FIG. 7, the notch 7c extending
over the outer peripheral wall 7a is elastic. Air flow can be achieved by providing the base 7b.
With this mounting structure of the electromagnetic actuator, as shown in FIG. 8, the frequency
characteristics of the 800 Hz to 3 KHz level can be stably obtained as shown in FIG. 9 as
compared to the frequency characteristics by the mounting structure of the electromagnetic
actuator without elastic packing. As a matter of fact, even a small and simple structure can be
configured to be able to further improve the frequency characteristics. As mentioned above, the
terms and expressions used in the present specification are used only for the purpose of
explanation, and do not limit the contents of the present invention. Even if limited terms and
expressions are used, this is not intended to exclude the equivalent of the above-described
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embodiment of the present invention or a part thereof. Therefore, it is apparent that various
modifications can be made within the scope of the claimed invention. BRIEF DESCRIPTION OF
THE DRAWINGS FIG. 1 is a side sectional view showing an assembly structure of an
electromagnetic actuator according to the present invention.
FIG. 2 is a perspective view showing an expanded first vibrator as a component of the
electromagnetic actuator according to the present invention. FIG. 3 is a perspective view showing
an expanded second vibrator which is a component of the electromagnetic actuator according to
the present invention. FIG. 4 is an exploded perspective view showing a housing which is a
component of the electromagnetic actuator according to the present invention. FIG. 5 is an
explanatory view showing an assembly procedure of the electromagnetic actuator according to
the present invention. FIG. 6 is an explanatory view showing the mounting structure of the
electromagnetic actuator according to the present invention in a partial cross section of the
device case and the mounting substrate. FIG. 7 is a perspective view showing an elastic packing
used in the mounting structure of the electromagnetic actuator of FIG. FIG. 8 is a graph showing
frequency characteristics of the mounting structure of the electromagnetic actuator without the
elastic packing of FIG. FIG. 9 is a graph showing frequency characteristics obtained from the
mounting structure of the electromagnetic actuator of FIG.
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