JP2010250574A - Displacement detection device and magnet device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly detect magnetic displacement by enabling a plurality of magnets with different magnetic forces to be compatible. <P>SOLUTION: A displacement detection device detects displacement, such as, opening and closing of a window by detecting magnetic force of a magnet device arranged on a monitoring object, such as the window with a magnetic sensing element. A magnet 14B includes a second magnet 200, which generates the same magnetic force as a first magnet with a plate shape but differs from the first magnet in dimension; and a yoke 202, which is arranged at the second magnet so that the second magnet 200 provides the same magnetic force pattern as that of the first magnet. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention relates to a displacement detection device and a magnet device that detect a displacement in a position state of a monitoring object such as a window using a magnetic detection element.

  Conventionally, as a displacement detection device that detects a change in the state of a window or the like by a magnetic change, the magnetic force of a magnet arranged on the window glass is detected by a magnetic sensing element, and when the detected magnetic force decreases, a window is opened and closed and an alarm is issued. There is a window open / close detection device.

  In addition, there is a type in which the magnetic force of a magnet disposed on an open / close lever of a crescent lock provided on a window is detected by another magnetic sensing element, and when the detected magnetic force decreases, the crescent lock is judged to be opened and an alarm is issued.

  Magnetic sensing elements used in window open / close detection devices mainly use reed switches that mechanically turn contacts on and off according to the strength of the magnetic force. There is a type used by Hall sensors that detect

  The magnetic force that passes through the magnetic sensing element is attenuated in proportion to the square of the distance from the magnet, so it is small yet powerful so that a sufficient change in magnetic force level can be obtained for opening and closing the window. A magnet that generates magnetic force is arranged on the window glass.

  For example, a neodymium magnet or a samarium cobalt magnet is used as a small and powerful magnet that is used for detecting the opening and closing of the window. A neodymium magnet is one of rare earth magnets mainly composed of neodymium, iron, and boron, and has the highest magnetic flux density, but has a low mechanical strength and a large change in magnetic force due to temperature.

  A samarium cobalt magnet is a rare earth magnet composed of samarium and cobalt, which has a magnetic force next to neodymium magnets, and has excellent corrosion resistance and little change in magnetic force due to temperature, but has low mechanical strength and high price.

Samarium cobalt magnets have been mainly used as the magnets used in the window open / close detection device. However, the use of neodymium magnets, which are inexpensive, is also under consideration due to the impact of soaring samarium, a rare resource.

JP 2003-281636 A Japanese Patent Laid-Open No. 2001-14990

  However, when a samarium-cobalt magnet is used as the magnet of such a conventional displacement detector, when this is replaced with a neodymium magnet that generates the same magnetic force, the generated magnetic force is the same. The plate-shaped samarium cobalt magnet and the neodymium magnet have different vertical and horizontal dimensions, and the magnetic pattern generated from the magnet differs due to the difference in dimensions. The magnetic sensing element detects the distance of the magnet as the object is displaced. The change in magnetic level will be different.

  For this reason, when simply replacing the samarium cobalt magnet with a neodymium magnet that generates the same magnetic force, it is necessary to reconstruct the displacement detection device back to the design level, and the samarium cobalt magnet and neodymium magnet cannot simply be interchanged. There's a problem.

An object of this invention is to provide the displacement detection apparatus and magnet apparatus which enable interchange of the several magnet from which a magnetic force pattern differs, without requiring the change by the side of a displacement detection apparatus.

The present invention relates to a displacement detection device that detects the displacement of a monitoring object by detecting the magnetic force of a magnet device arranged on the monitoring object with a magnetic sensing element.
Magnet device
A first magnet having a plate shape of a predetermined dimension; a second magnet having a magnetic material and dimensions different from those of the first magnet;
A yoke member made of a magnetic material arranged on the second magnet so as to have a magnetic force pattern similar to that of the first magnet;
It is provided with.

  Here, the first magnet of the magnet device is a samarium cobalt magnet, the second magnet is a neodymium magnet, and the yoke member is ferrite.

  In addition, a resin coat layer is provided that covers the outer side and fixes it in a plate shape with the yoke member disposed on the second magnet.

Further, the present invention provides a magnet device used in a detection device that detects a change in magnetic force due to displacement of an object by a magnetic sensing element.
A second magnet made of a magnetic material and dimensions different from the first magnet having a plate shape having a predetermined dimension;
A yoke member made of a magnetic material disposed on the second magnet so as to generate a magnetic force pattern similar to that of the first magnet;
It is provided with.

  In this magnet device, the first magnet is a samarium cobalt magnet, the second magnet is a neodymium magnet, and the yoke member is ferrite.

In addition, a resin coat layer is provided that covers the outer side and fixes it in a plate shape with the yoke member disposed on the second magnet.

According to the present invention, the second magnet having a strong magnetic force is smaller than the first magnet when the same magnetic force is generated, but the yoke member made of ferrite or the like is disposed on the second magnet. Thus, even if a second magnet having a different size is used, a magnetic force pattern substantially the same as that of the first magnet can be generated. Compatibility with a magnet device incorporating two magnets can be realized, and the cost of the magnet device can be reduced.

Explanatory drawing which showed the installation state of the window opening / closing detection apparatus by this invention Assembly exploded view showing an embodiment of a window opening and closing detection device according to the present invention Explanatory drawing which showed the relationship between the magnetic sensing element and magnet in the installation state of FIG. Explanatory drawing which showed the window opening / closing detection magnet provided with the samarium cobalt magnet used by this embodiment Explanatory drawing which showed the window opening / closing detection magnet provided with the neodymium magnet used by this embodiment interchangeably usable with FIG. The block diagram which showed the circuit structure of the window opening / closing detection apparatus by this embodiment The flowchart which showed the window opening / closing detection process of this embodiment by the processor of FIG.

  FIG. 1 is an explanatory view showing an installation state of a window opening / closing detection device for detecting opening / closing of a window by a change in magnetic level as a displacement detection device according to the present invention. In FIG. 1, a window opening / closing detection device 10 of the present invention is fixed to a vertical frame of a window sash 12a, 12b of a sliding window to be monitored by a double-sided tape or a screw.

  On the upper side of the window opening / closing detection device 10, the window sash 12 a, 12 b is closed, and a window opening / closing detection magnet 14 is attached to the opposite position with double-sided tape, and the magnetic force from the window opening / closing detection magnet 14 is incorporated. It is detected by a hall sensor as a magnetic sensing element.

  When the window sash 12a, 12b is opened, the magnetic force is reduced by the window opening / closing detection magnet 14 being separated from the window opening / closing detection device 10, and a detection signal indicating the opening of the window is detected by detecting the decrease in the magnetic force with a hall sensor. Sent to the monitoring panel by radio to alert.

  The window open / close detection device 10 is arranged so that the lower end thereof is close to the crescent lock 16 provided on the window sash 12a, 12b, and the magnetic force of the crescent lock detection magnet 20 attached to the open / close lever 18 of the crescent lock 16 is lowered to the lower end. It is detected by another hall sensor built in the side.

  The crescent lock 16 locks the window sashes 12a and 12b at an operation position in which the opening / closing lever 18 is rotated in the illustrated vertical direction. At this time, the crescent lock detection magnet 20 is the hall sensor closest to the window opening / closing detection device 10. The magnetic force to be detected is maximized, and the locked state is detected.

  When the crescent lock 16 is unlocked by turning the opening / closing lever 18 downward, the magnetic force is reduced by the separation of the crescent lock detection magnet 20, and a detection signal indicating the unlocked state is detected by detecting the decrease in the magnetic force with a hall sensor. Sends a warning to the monitoring device by radio.

  FIG. 2 is an exploded view showing an embodiment of the window opening / closing detection apparatus according to the present invention. In FIG. 2, the window opening / closing detection device 10 of the present embodiment includes an apparatus main body 22 and a cover member 24.

  The apparatus main body 22 has a circuit board 38 assembled in a body case 36.

  A sensor board 45 is erected on the upper side of the circuit board 38, and a hall sensor 46 for detecting window opening / closing is disposed here. A crescent lock detecting hall element 48 is provided at the lower end of the circuit board 38.

  The cover member 24 is detachable with respect to the apparatus main body 22, and a display window 57 is provided at the front center so that the display state of the display unit of the apparatus main body 22 can be seen.

  FIG. 3 is an explanatory diagram showing the relationship between the hall sensor and the magnet in the installed state of FIG. 1, in which FIG. 3 (A) shows a plan view and FIG. 3 (B) shows a state seen from the lateral direction.

  As shown in FIG. 3 (A), the window opening / closing detection device 10 of the present embodiment is attached to the vertical frame of the window sash 12a located inside by double-sided tape or screws, and is opposed to the right side surface of the window opening / closing detection device 10. The window opening / closing detection magnet 14 is adhered to the glass surface of the window sash 12b with double-sided tape.

  As shown in FIG. 3B, the window opening / closing detection hall sensor 46 built in the window opening / closing detection device 10 is mounted on the sensor substrate 45 so that the effective detection surface faces the window opening / closing detection magnet 14. When the window sashes 12a and 12b are closed, the distance d from the side of the apparatus is minimum, and the window opening / closing detection magnet 14 is a detection signal of a magnetic force level that is maximum with a positive polarity, for example, in accordance with the direction of the magnetic force lines indicated by broken lines. Is output.

  The minimum distance d when the window is closed varies depending on the structure of the window sash and the attachment state of the window opening / closing detection device 10, but in the present embodiment, the window is at a magnetic force level when it is disposed at a distance within a specified range. The amplification factor and the determination threshold are set by the amplifier so that the closed determination result can be obtained efficiently.

  The window determination threshold value for detecting the opening / closing of the window is measured by arranging a window opening / closing detection magnet 14 that is actually used in combination with a predetermined distance in an inspection process which is the final stage of the manufacturing process or an initial registration operation after installation. This is done through the registration process of the magnetic level using the environment, and details will be made clear later.

  Depending on the structure of the window, the window sash 12b may be on the inside, and the window opening / closing detection device 10 may be installed in the vertical frame in the direction opposite to that in FIG. In that case, the lines of magnetic force generated by the window opening / closing detection magnet 14 affixed to the glass surface of the window sash 12a pass through the window opening / closing detection hall sensor 46 from left to right, and are in the opposite direction to that shown in FIG. Therefore, the magnetic sensor level detection signal having a negative polarity is output from the window opening / closing detection hall sensor 46.

  Furthermore, in the present embodiment, another window determination threshold value is set for judging an illegal act of bringing a strong magnet closer so that the window open / close detection device does not operate due to mischief or the like, and this is regarded as opening the window. The

  FIG. 4 is an explanatory view showing a window opening / closing detection magnet 14A provided with a samarium cobalt magnet (first magnet) used in this embodiment, FIG. 4 (A) is a plan view, FIG. 4 (B) is a longitudinal section, FIG. 4C shows a cross section.

  In FIG. 4, a window opening / closing detection magnet 14A has a vertically long plate shape with a vertical width L, a horizontal width W, and a thickness D, and includes a plate-shaped samarium cobalt magnet 100 inside, and the entire outer side thereof is a resin coat layer made of synthetic resin. Covering with 102, strength is secured and moisture is prevented.

  As shown in FIG. 3, the window opening / closing detection magnet 14A using the samarium-cobalt magnet 100 is bonded to the glass surface of the window sash with a double-sided tape, and is built in the window opening / closing detection device 10 arranged on the window vertical frame side. A magnetic force is applied to the hall sensor 46 to detect the magnetic force level according to the distance.

  FIG. 5 is an explanatory view showing a window opening / closing detection magnet 14B provided with a neodymium magnet (second magnet) used in this embodiment compatible with the window opening / closing detection magnet 14A provided with the samarium cobalt magnet 100 of FIG. 5A shows a plane, FIG. 5B shows a longitudinal section, and FIG. 5C shows a transverse section.

  In FIG. 5, the window opening / closing detection magnet 14B uses a neodymium magnet 200 that generates substantially the same magnetic force as the samarium cobalt magnet 100 of FIG. 4, and generates a stronger magnetic force than the samarium cobalt magnet. It is shortened.

  On both sides of the neodymium magnet 100, ferrite yokes 202 using ferrite as a magnetic material are disposed. The ferrite yoke 202 compensates for the insufficient vertical width (L-L1) of the neodymium magnet 200, the horizontal width W and the thickness D are the same, and the vertical width is (L-L1) / 2.

  In this manner, with the ferrite yokes 202 disposed on both sides of the neodymium magnet 200, the entire outer side is covered and fixed with the resin coating layer 204 made of synthetic resin, thereby ensuring strength and preventing moisture.

  The window opening / closing detection magnet 14B can generate substantially the same magnetic force pattern as the window opening / closing detection magnet 14A by disposing ferrite yokes 202 on both sides of the neodymium magnet 200, and covering and fixing the resin yoke 204.

  Therefore, even when the window opening / closing detection magnet 14A shown in FIG. 4 is used as the window opening / closing detection magnet 14 in the installation state shown in FIG. 3, the window opening / closing detection magnet 14B shown in FIG. A magnetic force equivalent to that used when the sensor is used is applied to the hall sensor 46 built in the window opening / closing detection device 10 so that the opening / closing of the window can be detected from the magnetic force level that changes according to the distance, thereby ensuring compatibility.

  In FIGS. 4 and 5, since the thickness of the resin coats 102 and 204 is very small, the dimensions can be ignored.

  FIG. 6 is a block diagram showing a circuit configuration of the window opening / closing detection apparatus according to the present embodiment. In FIG. 6, a processor 60 provided as a control unit is a computer known as a one-chip microcomputer, and includes a CPU, ROM, RAM, AD conversion port, various input / output ports, etc. on one chip. In the embodiment, a nonvolatile memory 78 such as an EEPROM is externally attached.

  The magnetic force level detection signal from the window opening / closing detection magnet 14 provided on the window glass detected by the window opening / closing detection hall sensor 46 is amplified by the amplification circuit 62 and then applied to the AD conversion port 80 to be converted into a digitally converted magnetic force level (AD Conversion value) is taken into the processor 60.

  The magnetic force level detection signal detected by the lock detection hall sensor 48 and detected by the crescent lock detection magnet 20 on the open / close lever 18 of the crescent lock 16 is also amplified by the amplifier circuit 64 and then applied to the AD conversion port 82 for digital conversion. The obtained magnetic force level (AD conversion value) is taken into the processor 60.

  A display unit 66, a registration switch 70, and a wireless transmission unit 76 are provided for the processor 60.

  The display unit 66 displays a monitoring state such as opening of a window or unlocking.

  The registration switch 70 is used for setting a lock registration mode performed at the start of use of the present embodiment.

  The wireless transmission unit 76 is provided with a transmission circuit, and wirelessly communicates the monitoring state to the monitoring panel.

  The non-volatile memory 78 stores a window determination threshold value TH1 for window opening / closing detection obtained based on the magnetic force level Vs1 acquired from the window opening / closing detection hall sensor 46 of the apparatus.

  Further, the non-volatile memory 78 has a lock determination threshold value for detecting lock opening / closing obtained based on the magnetic force level Vs2 acquired from the lock detection hall sensor 48 in the crescent lock registration process performed with the window opening / closing detection device 10 installed in the window. TH2 is stored.

  The processor 60 is provided with a registration processing unit 84, a window opening / closing monitoring unit 86, a lock monitoring unit 88, and a communication control unit 90 as functions realized by execution of a program by the CPU.

  The registration processing unit 84 detects the magnetic force level Vs1 by the window opening / closing detection magnet 14 arranged at a predetermined distance d and performs initial registration in the nonvolatile memory 78, and lowers the level by a predetermined ratio with respect to the initially registered magnetic force level Vs1. The window determination threshold value TH1 for opening / closing the window is registered in the nonvolatile memory 68.

  Further, as shown in FIG. 1, the registration processing unit 84 moves the opening / closing lever 18 of the crescent lock 16 to the unlocked position after the installation of the window opening / closing detection device 10, the window opening / closing detection magnet 14 and the crescent lock detection magnet 20 is completed. In this state, when the registration switch 70 of the apparatus main body 22 is operated as shown in FIG. 2, the registration mode for a predetermined period is set and the registration process is executed.

  When the registration mode is started, the open / close lever 18 of the crescent lock 16 is moved to the locked position to bring the crescent lock detection magnet 20 closer.

  During operation in the registration mode, the registration processing unit 84 acquires the magnetic force level detected by the locking detection hall sensor 48 at a predetermined period, compares it with a predetermined predetermined effective level, and if it is an effective level, the registration processing unit 84 Stored in the memory 78 as a magnetic force level Vs2.

  When the magnetic force level Vs2 is effectively initially registered in the nonvolatile memory 78, the registration processing unit 84 calculates a value lower by a predetermined ratio than the initially registered magnetic force level, and determines a lock determination threshold TH2 for determining whether the crescent lock is unlocked or unlocked. Is registered in the non-volatile memory 78, and the lock monitoring of the crescent lock by the lock monitoring unit 78 is started.

  The window open / close monitoring unit 86 compares the magnetic force level obtained from the window open / close detection hall sensor 46 with the window determination threshold TH1 read from the nonvolatile memory 68, determines whether the window is open or closed, and wirelessly transmits a message indicating the determination result. The alarm is transmitted from the transmission unit 66 to the monitoring panel and the alarm is released.

  The lock monitoring unit 88 compares the magnetic force level obtained from the lock detection hall sensor 48 with the lock determination threshold value TH2 read from the non-volatile memory 78, and determines that the crescent lock is opened when the lock determination threshold value TH2 or less. An electronic message indicating unlocking is transmitted from the wireless transmission unit 76 to the monitoring device to give an alarm. In addition, the lock monitoring unit 88 wirelessly transmits a message to that effect to the monitoring device even when the lock monitoring unit 88 detects unlocking and returns to locking.

  In addition to the transmission of a message based on the judgments of the window opening / closing monitoring unit 86 and the lock monitoring unit 88, the communication control unit 90 transmits a regular notification message at regular time intervals.

  FIG. 7 is a flowchart showing the monitoring process of the present embodiment by the processor 60 of FIG.

  In FIG. 7, when the power is turned on with the site installed as shown in FIG. 1, the initialization process and the self-diagnosis process are executed in step S1, and if there is no abnormality, the process proceeds to step S2, and the nonvolatile memory Data including the window open / close monitoring window determination threshold value TH1 stored in 78 is read.

  Subsequently, the process proceeds to step S3, where it is determined whether or not the lock monitoring registration mode is set. When the setting of the lock monitoring registration mode is determined by turning on the registration switch 70, the process proceeds to step S4 and the lock detection hall sensor 48 performs the operation. Locking monitoring registration processing including initial registration of the magnetic force level Vs2 and registration of the lock determination threshold value TH2 for detecting locking and unlocking of the crescent lock 16 is executed.

  Subsequently, in step S5, it is determined whether or not a predetermined monitoring period has been reached. If it is determined that the monitoring period has been reached, the process proceeds to step S6 to execute a low battery monitoring process for the battery 44. At this time, if the battery voltage drops below the specified voltage, a message indicating a low battery is wirelessly transmitted to the monitoring device to display a failure.

  Next, in step S7, a window opening / closing monitoring process is executed, and when a window opening or window closing is determined, a message indicating the contents is transmitted to the monitoring device. Furthermore, when the lock monitoring process is executed in step S18 and it is determined whether the lock is unlocked or the subsequent lock is closed, a message indicating the content is transmitted to the monitoring device. Subsequently, in step S9, it is determined whether the periodic notification time has elapsed, and if it has been determined, the process proceeds to step S10, and a periodic notification process for transmitting a periodic notification message to the monitoring device is performed.

  In the above-described embodiment, the first magnet is a samarium cobalt magnet, and a neodymium magnet is taken as an example of a second magnet compatible with the first magnet. If the magnets have compatibility, the present invention can be applied as it is to two types of magnets using appropriate magnetic materials.

  In the above embodiment, the ferrite yokes are arranged on both sides of the neodymium magnet to supplement the vertical width, but yokes made of a magnetic material other than ferrite may be arranged. Also, two ferrites are used on both sides of the second magnet and are coated with resin to form a single plate. However, the present invention is not limited to this, and a single-plate yoke member is formed on the surface of the second magnet. May be applied to form a magnetic force pattern similar to that of the first magnet.

  In addition, the yoke member for forming a magnetic force pattern with the first magnet may be provided with a locking portion that allows the second magnet to be attached and detached so that it can be easily assembled. The magnetic force pattern of the second magnet to which the yoke member is attached is only required to be the same as that of the first magnet, and it is not always necessary to adjust the size to be the same as that of the first magnet.

  The magnetic sensing element is not limited to a hall sensor, and may be a reed switch.

  In the above embodiment, the magnet used for the window opening / closing detection is taken as an example. However, the above embodiment is an apparatus for detecting the magnetic force level due to the displacement of the magnet with the magnet mounted on the object by the magnetic sensing element. If it exists, the present invention can be applied to an appropriate apparatus.

Further, the present invention includes appropriate modifications that do not impair the object and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

10: Window opening / closing detection devices 12a, 12b: Window sashes 14, 14A, 14B: Window opening / closing detection magnet 16: Crescent lock 20: Crescent lock detection magnet 22: Device main body 24: Cover member 36: Body case 38: Circuit board 45: Sensor substrate 46: Hall sensor 48 for detecting opening / closing of window 48: Hall sensor for detecting locking 100: Samarium cobalt magnets 102, 204: Resin coat layer 200: Neodymium magnet 202: Ferrite yoke

Claims (6)

In a displacement detection device for detecting a magnetic force of a magnet device arranged on a monitoring object by a magnetic sensing element and detecting a displacement of the monitoring object,
The magnet device includes:
A first magnet having a plate shape of a predetermined dimension; a second magnet having a magnetic material and dimensions different from those of the first magnet;
A yoke member made of a magnetic material disposed on the second magnet so as to have a magnetic force pattern similar to that of the first magnet;
A displacement detection apparatus comprising:
2. The displacement detection device according to claim 1, wherein the first magnet of the magnet device is a samarium cobalt magnet, the second magnet is a neodymium magnet, and the yoke member is ferrite. Displacement detector.
2. The displacement detection device according to claim 1, further comprising a resin coat layer that covers the outer side and fixes the second magnet to a plate shape in a state where the yoke member is disposed.
In a magnet device used in a detection device that detects a change in magnetic force due to displacement of an object to be monitored by a magnetic sensing element,
A second magnet having a magnetic material and dimensions different from the first magnet having a shape of a predetermined dimension;
A yoke member made of a magnetic material disposed on the second magnet so as to generate a magnetic force pattern similar to the first magnet;
A magnet apparatus comprising:
5. The magnet apparatus according to claim 4, wherein the first magnet is a samarium cobalt magnet, the second magnet is a neodymium magnet, and the yoke member is ferrite.
  5. The magnet device according to claim 4, further comprising a resin coat layer that covers the outer side and fixes the second magnet to a plate shape in a state where the yoke member is disposed.

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