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JP2005242838

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DESCRIPTION JP2005242838
PROBLEM TO BE SOLVED: To miniaturize and reduce the cost of a crime prevention device by
sharing a sensor and an alarm. SOLUTION: A giant magnetostrictive element 11 which can be
expanded and contracted by vibration of an object to be attached, a coil 12 magnetically coupled
to the giant magnetostrictive element 11, a detection circuit 15 for detecting a change in current
flowing in the coil 12, and a detection circuit 15 A predetermined current is supplied to the coil
12 in response to the detection result, and a drive circuit 16 for vibrating the object to be
attached by applying a magnetic field from the coil 12 to the giant magnetostrictive element 11
is provided. As described above, since the giant magnetostrictive actuator doubles as a vibration
sensor and an alarm, it becomes possible to miniaturize the entire device and realize cost
reduction. Moreover, since the object to be attached is the diaphragm of the acoustic speaker, it
is not necessary to install an alarm device such as a speaker on the outdoor side. [Selected figure]
Figure 1
Security device
[0001]
The present invention relates to a crime prevention device, and more particularly to a crime
prevention device using a super magnetostrictive actuator.
[0002]
With the increase in the number of crimes in recent years, people's interest in crime prevention
is increasing day by day.
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1
For this reason, various security devices are currently being developed, but the most common
security device is of the type that detects intrusion of a suspicious person with a sensor and
issues an alarm. In this type of security device, a vibration sensor, an acoustic sensor, an infrared
sensor or the like is used as a sensor, and an acoustic speaker such as a siren or a buzzer or a
lighting device such as a warning light is often used as an alarm. JP 2002-125295 A
[0003]
However, since these security devices separately include a sensor for detecting a suspicious
person and an alarm for emitting an alarm, there has been a problem that the entire device
becomes large in size and the cost becomes high. In particular, it is possible to install a sensor on
the indoor side and install an alarm on the outdoor side, like a security device of a type that
detects intrusion of a suspicious person by detecting vibration of a door or glass and emitting an
alarm. Many security devices have various problems such as the wiring becomes complicated and
the wiring may be cut by a suspicious person.
[0004]
Therefore, an object of the present invention is to miniaturize and reduce the cost of a security
device by sharing a sensor and an alarm.
[0005]
Another object of the present invention is to provide a crime prevention device capable of
preventing intrusion of a suspicious person by installation on the indoor side.
[0006]
The security device according to the present invention comprises: a giant magnetostrictive
element expandable by vibration of an object to be attached, an electromagnetic conversion
means magnetically coupled to the giant magnetostrictive element, and a detection circuit for
detecting a change in current flowing through the electromagnetic conversion means. A driving
circuit for vibrating the object to be attached by supplying a predetermined current to the
electromagnetic conversion means in response to the detection result by the detection circuit and
applying a magnetic field to the super magnetostrictive element from the electromagnetic
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2
conversion means It is characterized by
According to the present invention, since the giant magnetostrictive actuator doubles as a
vibration sensor and an alarm, it is possible to miniaturize the entire device and realize cost
reduction.
Moreover, since the object to be attached is the diaphragm of the acoustic speaker, it is not
necessary to install an alarm device such as a speaker on the outdoor side.
[0007]
The structure of the normal dynamic acoustic microphone and the dynamic acoustic speaker are
basically the same, so in principle, it can be used as an actuator of a crime prevention device that
combines a vibration sensor and an alarm. However, the dynamic type actuator is characterized
by a large displacement amount and a small driving force, so it is extremely unsuitable as an
actuator of a security device attached to a door or the like. On the other hand, in the present
invention, since the super magnetostrictive actuator having a small displacement amount and a
large driving force is used, not only the vibration can be detected with high sensitivity, but also a
large volume can be detected from the mounting object. It can be generated.
[0008]
In the present invention, preferably, the electromagnetic conversion means is a coil having a
hollow portion, and the giant magnetostrictive element is inserted in the hollow portion of the
coil. According to this, it is possible to magnetically couple the giant magnetostrictive element
and the electromagnetic conversion means extremely simply and efficiently.
[0009]
The security device according to the present invention preferably further comprises a shaft
driven in the axial direction by the expansion and contraction of the super magnetostrictive
element, and a fixing means capable of pressing the tip of the shaft against the object to be
attached. According to this, it becomes possible to effectively use the attachment object as the
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3
diaphragm of the acoustic microphone and the diaphragm of the acoustic speaker.
[0010]
In the present invention, it is preferable that the drive circuit flows the predetermined current
through the electromagnetic conversion means in response to the detection circuit detecting a
current change equal to or higher than a threshold. If such a threshold is provided, it is possible
to effectively prevent a malfunction.
[0011]
In the present invention, preferably, the predetermined current includes an AC signal indicating
at least a warning sound or a voice. According to this, it becomes possible to generate a warning
sound and a sound from the attachment object.
[0012]
As described above, in the security device according to the present invention, since the super
magnetostrictive actuator doubles as a vibration sensor and an alarm, the entire device can be
miniaturized and cost reduction can be realized. Moreover, since the object to be attached is used
as the diaphragm of the acoustic speaker, it is possible to issue a warning for the suspicious
person who is outdoors from the indoor side, and as a result, wiring the alarm to the suspicious
person Problems such as disconnection can be avoided.
[0013]
Hereinafter, preferred embodiments of the present invention will be described in detail with
reference to the accompanying drawings.
[0014]
FIG. 1 is a schematic view showing the configuration of a security device 10 according to a
preferred embodiment of the present invention.
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[0015]
As shown in FIG. 1, the security device 10 according to the present embodiment is disposed on
the giant magnetostrictive element 11, the coil 12 wound around the giant magnetostrictive
element 11, and the end 11 a of the giant magnetostrictive element 11. The shaft 13 is driven in
the axial direction (X direction shown in FIG. 1) by the expansion and contraction of the giant
magnetostrictive element 11 according to the application of the magnetic field, the yoke 14
disposed on the end 11b side of the giant magnetostrictive element 11, and the coil 12 , A drive
circuit 16 for supplying current to the coil 12, a power supply 17 for supplying operating power
to the detection circuit 15 and the drive circuit 16, and a case 18 for accommodating the
respective members. And have.
Further, the security device 10 according to the present embodiment is provided with a screw 22
for fixing the housing 18 to the attachment object.
[0016]
Among these elements, the giant magnetostrictive element 11, the coil 12, the shaft 13, and the
yoke 14 constitute a so-called giant magnetostrictive actuator.
A giant magnetostrictive actuator is an actuator utilizing displacement of a giant magnetostrictive
element, and unlike a magnetostrictive element up to now, a magnetostrictive element (super
magnetostrictive element) having a very large displacement of 1,500 ppm to 2,000 ppm has
become known Since then, several proposals have been made to use it as a drive circuit for an
acoustic transducer (see Patent Document 1).
[0017]
The giant magnetostrictive element 11 is a rod-like body made of a giant magnetostrictive
material that expands and contracts in response to the application of a magnetic field, and there
is no particular limitation on the giant magnetostrictive material used, but Tb0.34-Dy0.66- It is
possible to use a super magnetostrictive material or the like whose central composition is Fe
1.90. The size of the giant magnetostrictive element may be appropriately selected according to
the size and output of the desired security device 10. Further, in the present embodiment,
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5
permanent magnets 19a and 19b are disposed at the end portions 11a and 11b of the giant
magnetostrictive element 11, respectively, whereby a magnetic bias is always applied to the giant
magnetostrictive element 11.
[0018]
The coil 12 is held in the hollow portion 12 a with the giant magnetostrictive element 11
inserted therein, and is used as an electromagnetic conversion means magnetically coupled to the
giant magnetostrictive element 11. Therefore, when a predetermined current is supplied from the
drive circuit 16, the coil 12 applies a magnetic field based on this to the giant magnetostrictive
element 11. Conversely, when the giant magnetostrictive element 11 expands and contracts due
to an external force, and the permeability of the giant magnetostrictive element 11 changes
thereby, the coil 12 supplies the current generated thereby to the detection circuit 15.
[0019]
The shaft 13 has a rod-like main body 13a and a collar 13b provided at an end of the main body
13a. The axis of the main body 13a substantially coincides with the axis of the giant
magnetostrictive element 11, and its tip 13c is open. The flange 13b has a diameter larger than
that of the main body 13a, and the end face 13d is pressed against the giant magnetostrictive
element 11 by the bias of the spring 20 (in the present embodiment, the giant magnetostrictive
element 11 is interposed via the permanent magnet 19a. Being pressed). Thus, when the drive
circuit 16 supplies a predetermined current to the coil 12, a magnetic field is applied to the giant
magnetostrictive element 11, and expansion and contraction of the giant magnetostrictive
element 11 according to the magnetic field strength is transmitted to the tip 13c of the shaft 13.
Conversely, when an external force is applied to the tip 13 c of the shaft 13, the super
magnetostrictive element 11 expands and contracts, whereby the current generated in the coil
12 is supplied to the detection circuit 15. As shown in FIG. 1, the tip 13 c of the shaft 13 is open
and held in a slightly projecting state from the mounting surface 18 a of the housing 18.
[0020]
The detection circuit 15 is a circuit that detects a change in current flowing through the coil 12
and is used to detect whether an external force is applied to the tip 13 c of the shaft 13. The
change in current flowing through the coil 12 is transmitted to the detection circuit 15 through
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the pair of wires 21. The detection circuit 15 activates the detection signal 15a when detecting a
current change equal to or higher than a threshold. The reason for providing such a threshold is
to prevent a malfunction.
[0021]
The drive circuit 16 is a circuit for supplying a predetermined current to the coil 12, and
activates the stop signal 16a in response to the activation of the detection signal 15a, and
supplies the predetermined current to the coil 12. The stop signal 16a is supplied to the
detection circuit 15, and when the stop signal 16a is activated, the detection circuit 15
temporarily stops the detection of the current change. This is to prevent the detection circuit 15
from being affected by the current supplied by the drive circuit 16 because the wire 21
connected to the coil 12 is shared by the detection circuit 15 and the drive circuit 16.
[0022]
The power supply 17 is an element for supplying operating power to the detection circuit 15 and
the drive circuit 16 via the power supply wiring 17a and the ground wiring 17b. Specifically, a
battery can be used.
[0023]
FIG. 2 is a schematic perspective view showing a state in which the security device 10 according
to the present embodiment is attached to an object 30.
In FIG. 2, the example which made the door the attachment target object 30 is shown, and in this
case, the crime prevention apparatus 10 is fixed to the indoor side of the door which is the
attachment target object 30, and is used.
[0024]
FIG. 3 is a schematic cross-sectional view showing an enlarged main part of the security device
10 attached to the attachment object 30. As shown in FIG. As shown in FIG. 3, when the security
device 10 is attached to the attachment object 30 using the screw 22, the tip 13 c of the shaft 13
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is pressed against the attachment object 30. Thereby, when vibration is applied to the door which
is the mounting object 30, this vibration causes the super magnetostrictive element 11 to expand
and contract, whereby an electromotive force is generated in the coil 12. This means that the
door itself, which is the mounting object 30, functions as a diaphragm of the acoustic
microphone. Conversely, if a predetermined current is supplied to the coil 12, the door itself that
is the attachment object 30 can be vibrated, and in this case, the door itself that is the attachment
object 30 functions as the diaphragm of the acoustic speaker. Means
[0025]
FIG. 4 is a flowchart for explaining the operation of the security device 10 according to the
present embodiment.
[0026]
Usually, the security device 10 according to the present embodiment is in the monitoring mode,
and the detection circuit 15 constantly monitors the change in the current flowing through the
coil 12 (step S1).
This is a state where it is monitored whether a suspicious person is trying to destroy or illegally
open the door. Then, when the detection circuit 15 detects a current change equal to or higher
than the threshold (step S1: YES), the detection circuit 15 activates the detection signal 15a (step
S2), and the drive circuit 16 receiving this activates the stop signal 16a. It is activated (step S3).
As a result, the detection circuit 15 is stopped, and the security device 10 shifts to the warning
mode. Therefore, it is necessary to set the threshold value of the detection circuit 15 to a level
that can detect the vibration that occurs when a suspicious person tries to break the door or
open the door illegally.
[0027]
When transitioning to the warning mode, the drive circuit 16 applies a predetermined current to
the coil 12 to vibrate the mounting object 30 (door) (step S4). The predetermined current
supplied to the coil 12 is preferably an alternating current signal indicating a warning sound or a
voice. In this case, the mounting object 30 (door) can generate a warning sound or a warning
voice from itself. Such warning sound or sound is generated for a predetermined time (step S5),
and when the predetermined time has elapsed (step S5: YES), the current supply to the coil 12 by
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the drive circuit 16 is stopped (step S6). At the same time, the detection signal 15a and the stop
signal 16a are inactivated (steps S7 and S8), and the monitor mode is returned again.
[0028]
As described above, in the security device 10 according to the present embodiment, since the
giant magnetostrictive actuator including the giant magnetostrictive element 11 doubles as a
vibration sensor and an alarm, the number of parts can be reduced, and the entire device can be
miniaturized. It is possible to realize cost reduction easily. Moreover, since the attachment object
30 itself is used as the diaphragm of the acoustic speaker, it is possible to issue a warning to the
suspicious person who is outdoors from the indoor side, and as a result, wiring the alarm to the
suspicious person Can avoid problems such as disconnection.
[0029]
FIG. 5 is a schematic view showing the configuration of a security device 40 according to another
preferred embodiment of the present invention.
[0030]
The crime prevention device 40 according to the present embodiment has a configuration in
which the tuner 41 is added to the crime prevention device 10 according to the above
embodiment, and the other points are the same as the crime prevention device 10.
The tuner 41 is a tuner such as a television or radio, and generates audio of the television or
radio from the attachment object by supplying the received audio signal to the coil 12 in the
monitoring mode. This makes it possible for the suspicious person to feel ill at home even when
away from home, thus making it possible to prevent the occurrence of a crime in advance.
[0031]
The present invention is not limited to the embodiment described above, and various
modifications are possible within the scope of the invention described in the claims, and they are
also included in the scope of the present invention. It goes without saying that
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[0032]
For example, although each of the above embodiments has a configuration in which the tip 13a
of the shaft 13 is pressed against the mounting object using the screw 22, the fixing means that
can be pressed is not limited to the screw. It does not matter.
The use of an adhesive is particularly suitable in the case where it is difficult to fix with a screw,
as in the case where the object to be attached is a window glass.
[0033]
It is a schematic sectional drawing which shows the structure of the crime prevention apparatus
10 by preferable embodiment of this invention. It is a schematic perspective view which shows
the state which attached the crime prevention apparatus 10 by this embodiment to the
attachment target object 30. FIG. FIG. 6 is a schematic cross-sectional view showing an enlarged
main part of the crime prevention device 10 attached to the attachment object 30. 5 is a
flowchart for explaining the operation of the crime prevention device 10. It is the schematic
which shows the structure of the crime prevention apparatus 40 by other preferable embodiment
of this invention.
Explanation of sign
[0034]
DESCRIPTION OF SYMBOLS 10 security device 11 super magnetostrictive element 11a, 11b end
part of super magnetostrictive element 12 coil 12a hollow part of coil 13 shaft 13a main body
part 13b edge part 13c tip 13d end face 14 yoke 15 detection circuit 15a detection signal 16
drive signal 16a stop signal 17 Power supply 17a Power supply wiring 17b Ground wiring 18
Casing 18a Mounting surface 19a, 19b Permanent magnet 20 Spring 21 Wiring 22 Screw 30
Mounting object 41 Tuner
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