JP2006208307A - Magnetic detection type sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic detection type sensor that employs a switch and prevents determination of a closed state when a window, a door, or the like is in a half closed state. <P>SOLUTION: The magnetic detection type sensor to be installed in the window, door, or the like comprises a switch section and a magnetic field measuring section for measuring the magnetic field strength. When a switch section detects ON and the magnetic field strength obtained from the magnetic field measuring section exceeds a predetermined closing strength, it is determined that the window, door, or the like is closed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a magnetic detection type sensor that detects the proximity of a magnet and switches a switch to an ON or OFF state. The magnetic detection is used when an alarm is activated by detecting opening / closing of a window / door. It relates to a type sensor.

As a magnetic detection type sensor that detects opening and closing using a switch, for example, one described in Patent Document 1 is known.
FIG. 8 is a diagram showing the magnetic detection type sensor of Patent Document 1. As shown in FIG.
This magnetic detection type sensor has a structure in which the proximity of the magnet 24 is detected and the reed switch 42 in the detection unit 40 is switched. When the magnet 24 approaches the detection unit 40, the normally open contact NO is connected under the influence of the magnetic field of the magnet 24, and the reed switch 42 is turned on. Further, when the magnet 24 moves away from the detection unit 40, it is not affected by the magnetic field of the magnet 24, so the normally closed contact NC is connected and the reed switch 42 is turned off.

  The current monitoring circuit 16 of the monitoring unit 10 monitors the current applied to the detection unit 40, and when a current larger than the current in the normal state flows, the alarm 18 is activated and a predetermined alarm is generated by a buzzer or the like. Is generated. That is, when the reed switch 42 is ON, the monitoring unit 10 flows a current in a normal state, and when the reed switch 42 is OFF, a current larger than the current in the normal state flows. Opening / closing of windows and doors can be detected depending on the size.

By the way, the strength of the magnetic field when the reed switch used in such a magnetic detection type sensor changes from OFF to ON is the strength of the magnetic field that the reed switch receives from the magnet while the window is firmly closed. (Hereinafter, referred to as a complete closing value).
The reason for this is as follows.

First, the distance between the detection unit 40 and the magnet 24 varies depending on the window or door on which the magnetic detection sensor is installed. That is, the complete closing value differs depending on the window or door where the magnetic detection type sensor is installed.
When the strength of the magnetic field when the reed switch 42 changes from OFF to ON is set to a fully closed value obtained when the reed switch 42 is installed in a specific window, the window is firmly closed for opening and closing in the specific window. At that time, the reed switch changes from OFF to ON, so that an ideal magnetic detection type sensor is obtained.
However, when this magnetic detection type sensor is installed in another window, the distance between the detection unit 40 and the magnet sensor 24 is not necessarily the same distance as the specific window. Therefore, if the complete closing value of another window is smaller than a specific window, the reed switch 42 does not change from OFF to ON even when the window is firmly closed, and the magnetic detection sensor It becomes impossible to determine that it is closed.

  A second reason is that the strength of the magnetic field received by the reed switch 42 may change due to external factors even when the window is firmly closed. External factors are vibrations caused by cars and winds passing nearby. When the strength of the magnetic field when the reed switch 42 changes from OFF to ON is set to a completely closed value, the strength of the magnetic field applied to the reed switch 42 due to the vibration of the window due to this external factor is reduced. Even if the state is changed and the cover is closed firmly, the reed switch 42 is turned off, and the determination contradicts the state of the window.

  The third reason is the performance error of the parts of the reed switch 42 and the magnet 24. Even with the same reed switch, the strength of the magnetic field when changing from OFF to ON is different, and the strength of the magnetic field is different even with the same magnet. If the strength of the magnetic field when the reed switch 42 changes from OFF to ON is set to a completely closed value, the reed switch 42 is turned off even if it is firmly closed due to the performance error of this part. Therefore, the determination is contrary to the state of the window.

  For the above reasons, the magnetic detection sensor has a low magnetic field strength when detecting ON from OFF, that is, use a highly sensitive reed switch, or conversely, use a magnet with a strong magnetic field. I have to do it. That is, the strength of the magnetic field when the reed switch used in the magnetic detection type sensor changes from OFF to ON is set to a value smaller than the complete closing value.

In addition, in the previously filed Japanese Patent Application No. 2005-1189, the present applicant detects an act of making a magnetic detection type sensor non-sensing state using a planning magnet (hereinafter referred to as a planning action). We propose a magnetic detection sensor that can
Specifically, the planning action is, for example, an action of improperly applying a strong magnetic field to the reed switch so that the reed switch remains on even if the window is opened.
This magnetic detection type sensor includes a reed switch and a magnetic field measuring unit that measures the strength of the magnetic field with respect to the reed switch. The magnetic field strength measured by the magnetic field measurement unit when the reed switch is ON is stored as a reference value, and the difference between the reference value and the magnetic field strength obtained from the magnetic field measurement unit exceeds a predetermined value. And determine whether there is a plan action.

JP-A-9-245266

In the conventional magnetic detection type sensor, the strength of the magnetic field when the reed switch 42 changes from OFF to ON is set to a value smaller than the complete closing value.
Therefore, even if the reed switch 42 outputs ON, the window may be slightly opened (hereinafter referred to as a semi-closed state) depending on how the window is closed.

  In this semi-closed state, the magnetic detection sensor as described in Japanese Patent Application No. 2005-1189 sets the strength of the magnetic field when the window is not firmly closed as a reference value for determining the plan. There is a possibility that.

  If the reference value is set in the semi-closed state, it is determined that there is a planning action even if the planning action is not performed, and an erroneous determination may be made. For example, when the user closes the window firmly from a semi-closed state, the strength of the magnetic field applied to the reed switch 42 changes, and the erroneous determination is made that there is a plan action even though the plan action is not being performed. May end up.

  The present invention has been made to solve such a problem. In a magnetic detection sensor using a switch, it is determined that the window is closed when the window, the door, or the like is in a semi-closed state. It is an object of the present invention to provide a magnetic detection type sensor that prevents this from happening.

  In order to achieve the above object, a magnetic detection sensor according to the present invention includes a magnet installed on a movable member such as a window or a door, and a detection unit installed at a position facing the magnet when the movable member is closed. The sensor unit is a magnetic detection type sensor. The detection unit turns on when the magnet comes close, and turns off when the magnet leaves, the magnetic field measurement unit that measures the strength of the magnetic field, and the switch unit changes from ON to OFF. A storage unit that stores at least a value larger than the strength of the magnetic field to be used as the closing strength, and the movable member when the switch portion is ON and the magnetic field strength obtained from the magnetic field measuring unit exceeds the closing strength. It has the control part containing the closing determination means which determines that is closed, and the output part which outputs the determination result of a control part, It is characterized by the above-mentioned.

  Further preferably, the battery further includes a battery that supplies power to the detection unit, and the control unit is configured to first-activate the magnetic field measurement unit by the closing determination unit when the switch unit detects a change from OFF to ON. It is characterized by including.

  Furthermore, preferably, the control unit has a time measuring unit that measures a predetermined time when the switch unit detects ON, and the control unit activates the magnetic field measuring unit by the closing determination means at every predetermined time measured by the time measuring unit. The second starting means is included.

  Furthermore, preferably, the control unit uses the strength of the magnetic field obtained from the magnetic field measurement unit when the closing determination unit determines that the movable member is closed as a reference value for determining the plan action. It is characterized by including setting means for setting.

  Further, preferably, the closing strength is a value smaller than the strength of the magnetic field applied to the switch portion by the magnet when the movable member is completely closed.

  Further preferably, the control unit includes an open determination unit that determines that the movable member is open when the switch unit detects a change from ON to OFF.

  In the magnetic detection type sensor according to claim 1, the magnetic field strength obtained when the strength of the magnetic field obtained from the magnetic field measurement unit is sufficiently closed even when the switch unit detects ON. If the closing strength is not exceeded, it is not determined that the movable member is closed. Therefore, it is possible to prevent the door from being determined to be closed when the movable member is in a semi-closed state.

  In the magnetic detection type sensor according to claim 2, when the switch unit is changed to ON, the closing determination unit activates the magnetic field measurement unit to determine whether the movable member is closed. It is possible to prevent the movable member from being semi-closed with low power consumption without always monitoring the part.

In the magnetic detection type sensor according to the third aspect, while the switch unit detects ON, the close determination means activates the magnetic field measurement unit every predetermined time to determine whether the movable member is closed.
Therefore, when the switch unit detects ON, but the strength of the magnetic field obtained from the magnetic field measurement unit does not exceed the closing strength and it is not determined that the movable member is closed, the user In order to operate one starter, it is not necessary to open the movable member once and turn off the switch part, then close the movable member and change the switch part to ON.

In the magnetic detection type sensor according to claim 4, the strength of the magnetic field in the magnetic field measurement unit when it is determined by the closing determination means that the movable member is sufficiently closed is a reference value for determining the plan action Set as
Thereby, it is possible to prevent the setting of the reference value in the semi-closed state and erroneous determination of the presence of the plan action. For example, when the user further closes the movable member from the semi-closed state, it can be prevented that it is erroneously determined that the plan action has been performed.

The magnetic detection type sensor according to claim 5 sets the closing strength within a range where a semi-closed state can occur.
Thereby, it can prevent that the semi-closed state which cannot be detected only with a switch part arises.

  In the magnetic detection type sensor according to claim 6, when it is determined that the movable member is closed, in addition to the output of the switch unit and the output of the magnetic field measurement unit, it is determined strictly. When it is determined that the member is open, the determination is made based on the output of the switch unit. Thereby, the magnetic detection type sensor which can perform the open / close determination excellent in crime prevention can be provided.

Embodiments of a magnetic detection sensor according to the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram of a magnetic detection type sensor according to the present invention.
The magnetic detection type sensor includes a detection unit 50 and a magnet 60, and is installed in a window or door having a movable member. And the detection unit 60 is installed and used in the position which opposes the magnet 60 in the state which the window, the door, etc. closed.
In the present embodiment, a description will be given assuming that the magnetic detection type sensor is installed in a plurality of windows.

  The control unit 51 is a CPU or MPU that controls each unit of the detection unit 50. The control unit 51 includes a closing determination unit that determines that the window is closed, a first starting unit and a second starting unit that start the closing determination unit, and an opening determination unit that determines that the window is open. , Setting means for setting a reference value for determining the plan action, and plan determination means for determining the plan action.

  The switch unit 52 is a reed switch that detects the proximity of the magnet 60. This may have a transfer contact as described in Patent Document 1, or may have a make contact. In the present embodiment, description will be made assuming that the latter has a make contact. The switch portion 52 having a make contact is turned on when the magnet 60 approaches, and turned off when the magnet 60 leaves.

  The magnetic field measurement unit 53 is an MR element that measures the strength (or magnetic flux density, etc.) of an external magnetic field. The magnetic field measurement unit 53 is disposed in the vicinity of the switch unit 52 so that the strength of the magnetic field applied to the switch unit 52 from the outside can be measured. For the measurement of the strength of the magnetic field, a Hall element or Hall IC is used in addition to the MR element.

The storage unit 54 is used to determine the operation program of the control unit 51, the closing strength used when it is determined that the window is closed, the open / closed state of the window, the identification code of the magnetic detection sensor, and the measure action. Stores judgment values, reference values, etc.
Here, the determination value is a value having a margin from the strength of the magnetic field received by the magnetic field measurement unit 53 from the magnet 60 in a state where the movable member is sufficiently closed. The plan action is detected based on the determination value.
The closing strength will be described later in the description of the operation flow of the magnetic detection type sensor.

  The output unit 55 monitors signals from the closing determination unit, the opening determination unit, and the plan determination unit in the control unit 51 together with an identification code stored in the storage unit 54 to monitor the state of a magnetic detection sensor described later. 70 is wirelessly transmitted. The reason for transmitting wirelessly is that when the detection unit 50 is installed in a sliding window or a raising / lowering window, the wiring does not get in the way when the window is opened and closed, and the appearance is excellent.

The timer 56 measures a predetermined time.
The battery 57 supplies power for driving the detection unit 50.

  FIG. 7 is a schematic view showing an installation mode when the magnetic detection type sensor according to the present invention is installed in a sliding window as an example.

  The detection unit 50 and the magnet 60 are respectively installed in the window 100 and the window 101 which are movable members so as to face each other in a state where the window is closed. The detection unit 50 is installed on the surface where the crescent lock 102 of the indoor window 100 is located. The magnet 60 is installed on the glass surface of the outdoor window 101 at a position facing the detection unit 60. Then, the detection unit determines the open / closed state of the window 100 and the window 101, and transmits a wireless signal indicating that to the monitoring device 70.

A monitoring device 70 that monitors the state of the magnetic detection type sensor will be described with reference to FIG.
The control unit 71 is a CPU or MPU that controls each unit of the monitoring device 70.
The mode setting unit 74 is a card reader in which a user sets a monitoring mode in which a window is monitored by a magnetic detection sensor and a release mode in which the monitoring is not performed. The mode is switched by authentication using an ID card possessed by the user. In the present embodiment, the mode setting unit 74 is described as a card reader. However, the mode setting unit 74 is not limited to this, and may be a type that inputs a personal identification number or a type that inputs biometric information such as a fingerprint. Good.

The receiving unit 73 is an antenna that receives a radio signal from the magnetic detection type sensor.
The storage unit 74 stores the open / close state of the window, the identification code of the magnetic detection type sensor, the set mode, the ID code input by the ID card when switching the mode, the operation program of the control unit 71, and the like. In addition, the memory | storage part 74 has memorize | stored the opening / closing state of the window for every identification code of a magnetic detection type sensor.
The alarm unit 75 is a buzzer that informs the surroundings of the opening of the window during the monitoring mode.
The display unit 76 displays the currently set mode, the open / closed state of the window, and the like to the user. A known display device such as an LED or a liquid crystal screen is used for display.

3 and 4 are operation flows of the magnetic detection type sensor.
When the power is turned on and the magnetic detection sensor is in an operating state, first, in S101, a change in the state of the switch unit 52 is monitored.
When the switch unit 52 changes from ON to OFF, it is determined that the window is opened. If the closed state is stored in the storage unit 54 (S120 YES), an open detection signal indicating that the window has been opened is transmitted from the output unit 55 to the monitoring device 70 together with its own identification code (S121). The open state is stored in 54 (S122).
On the other hand, when the switch unit 52 changes from OFF to ON, it is further determined whether or not the window is sufficiently closed by the processing from S102.

  That is, the determination as to whether or not the window has been opened is made by the switch unit 52, whereas the determination as to whether or not the window has been closed depends on the output from the magnetic field measurement unit 53 in S102 and subsequent steps. Judgment is made strictly by taking into account the determination process using.

  When the switch unit 52 is changed from OFF to ON in S101, timing of the first predetermined time (T1) is started (S102). In S103, it is determined whether or not a first predetermined time has elapsed. This is to measure the strength of the magnetic field when the window stops moving when the window is closed. Therefore, T1 may be about several seconds.

  When the elapse of T1 is determined in S103, the magnetic field strength measured by the magnetic field measurement unit 53 is sampled and temporarily stored in the storage unit 54 as a reference candidate value (H0) (S104). This sampling may be performed several times at short intervals, and the average value of the obtained sample values may be stored. Thereby, the influence of chattering noise can be eliminated.

Next, it is determined whether the window is sufficiently closed from the temporarily stored reference candidate value (H0). Specifically, it is determined whether or not the reference candidate value obtained in S104 is greater than a predetermined closing strength (TH1) (S105).
If H0> TH1 (YES in S105), it is determined that the window is sufficiently closed, the reference candidate value is stored as a reference value for determining the plan (S106), and the window indicating that the window is closed is closed. The detection signal is transmitted from the output unit 55 to the monitoring device 70 together with its own identification code (S107). Then, the closed state is stored in the storage unit 54 (S108).
Furthermore, in S109, the second threshold value (TH2) and the third threshold value (TH3) for determining the presence / absence of the plan action are set and stored from the reference value. Specifically, a value obtained by adding a determination value to a reference value is TH2, and a value obtained by subtracting the determination value from the reference value is TH3.

Thus, when the switch unit 52 outputs a change from OFF to ON in S101, the output is sampled from the magnetic field measurement unit 53 in S104, and it is determined whether or not the window is sufficiently closed in S105. Execute the process. Thereby, since the process of the magnetic field measurement part 53 which consumes electric power is started only when needed, the power consumption of a magnetic detection type sensor can be suppressed low.
In addition, the reference value for determining the plan action is set as the strength of the magnetic field obtained from the magnetic field measuring unit 53 when the window is sufficiently closed. be able to.

Here, how to determine the closing strength (TH1) in the embodiment will be specifically described with reference to FIG.
In FIG. 6, the vertical axis represents the state of the switch unit 52, and the horizontal axis represents the strength of the magnetic field received by the switch unit 52.
Hmax is the strength of the magnetic field received by the switch unit 52 from the magnet 60 when the window, door, or the like is completely closed.
Then, Hon is the magnetic field strength when the reed switch detects a change from OFF to ON, and Hoff is the magnetic field strength when the reed switch detects a change from ON to OFF.

Since the closing strength (TH1) is a value for determining whether or not the window is sufficiently closed, it is the strength of the magnetic field that the switch unit 52 receives from the magnet when the window is completely closed. It is optimal to set Hmax.
However, Hmax is not necessarily a fixed value. It fluctuates due to the shape of the window, the mounting position, the wind, the vibration of a car passing nearby, and the like. The magnetic field measurement unit 53 is disposed in the vicinity of the switch unit 52 so that the strength of the magnetic field applied to the switch unit 52 from the outside can be measured. However, the magnetic field strength received by the switch unit 52 itself. Cannot be detected.
Therefore, the closing strength (TH1) is set to a value smaller than Hmax by an experiment considering these points.
However, if the closing strength (TH1) is set too low, it is not possible to prevent the half-closed state where the window is closed halfway. That is, it is impossible to prevent a semi-closed state when the magnetic field strength received by the switch unit 52 is larger than Hoff shown in FIG. 6 and smaller than Hmax.
From the above, the closing strength (TH1) is set to a value that is at least larger than Hoff and smaller than Hmax. As the closing strength (TH1) is set to a value closer to Hmax, it can be determined that the window is closed more severely, but it is erroneously determined that the window is sufficiently closed but not closed. The probability of doing will increase. Conversely, the closer the value is to Hoff, the lower the probability of misjudging that the window is fully closed but not closed, but loosely determining that the window is closed. become. Within this range, the closure strength (TH1) is experimentally set to an appropriate value.

Returning to the flow of FIGS. 3 and 4, the description of the operation flow of the magnetic detection type sensor will be continued.
If H0> TH1 is not satisfied in S105, the second predetermined time (T2) that is the sampling period is counted (S130, S132), and the state of the switch unit 52 is determined in this timing loop (S131). ). When the state of the switch unit 52 is OFF, it is determined that the window has been opened, and the process exits the time counting loop and proceeds to S120.

  If the process does not exit from the timed loop to S120 (YES in S132), the process returns to S104, and the magnetic field strength is again sampled from the magnetic field measurement unit 53, and it is determined in S105 whether the window is sufficiently closed. judge.

  If it is determined in S105 that the window is not sufficiently closed, the processing of S104 → S105 → S130 → S131 → S132 is repeated.

This operation is performed in order to prevent a problem that occurs when the switch unit 52 detects ON but the window is not sufficiently closed in the process of S105 and is in a semi-closed state.
The problem is that, from this semi-closed state, when the user sufficiently closes the window, the switch unit 52 originally detects ON, so that the switch unit 52 changes from OFF to ON in S101. In other words, the processing from S102 onward is not executed. Then, the user has to bother to open the window and close the window again so that the switch unit 52 is turned on. This is very inconvenient for the user.

  Therefore, it is determined that the switch unit 52 is turned off in S131 and the window is opened by the process of S104 → S105 → S130 → S131 → S132, or the window is sufficiently closed in the determination of S105. Unless the determination is made, the operation of repeating the determination process of S105 is performed every predetermined time (T2).

  Also, with this operation, when the switch unit 52 detects OFF, the magnetic field measurement unit 53 that consumes power is not monitored, so that power consumption can be minimized.

  On the other hand, when it is determined that the window is sufficiently closed and the second threshold and the third threshold for determining the plan are set in S109, a second predetermined time (T2) that is a sampling period is set. Is measured (S110, S112), and the state of the switch unit 52 is determined in the timed loop (S111). When the state of the switch unit 52 is OFF, it is determined that the window has been opened and the window has opened, and an open detection signal is transmitted from the output unit 55 to the monitoring unit 70 together with its own identification code (S121). And an open state is memorize | stored in the memory | storage part 54 (S122), and it returns to S101.

  If the time loop does not return to S120, H1 obtained by sampling the magnetic field intensity measured by the magnetic field measurement unit 53 is obtained (S113), and whether or not H1> TH2 or H1 <TH3 is satisfied. Is determined (S114).

If the formula of S114 is established, it is determined that there is a plan action and if the closed state is stored (YES in S115), an open detection signal is transmitted from the output unit 55 to the monitoring unit 70 together with its own identification code (S116). . When the monitoring device 70 receives the open detection signal, the monitoring device 70 sounds an alarm buzzer from the alarm unit 75 if the monitoring mode is set. And an open state is memorize | stored in the memory | storage part 54 (S617), and it progresses to S110.
If the expression of S114 is not satisfied and the open state is stored (S140 YES), the close detection signal is transmitted to the monitoring unit 70 together with its own identification code (S141). Then, the closed state is stored in the storage unit 54 (S142), and the process proceeds to S110.

The operation of the monitoring device 70 that monitors the state of the magnetic detection type sensor will be described.
First, when the receiving unit 73 receives an open detection signal or a close detection signal with an identification code added thereto from the magnetic detection type sensor, the control unit 71 sets the open / close state of the window in the corresponding identification code in the storage unit 74. They are stored as an open state and a closed state, respectively.

  Next, the monitoring flow of the monitoring device 70 that monitors the state of the magnetic detection type sensor will be described with reference to FIG. In this flow, it is assumed that the storage unit 74 of the monitoring device 70 in the initial state stores the release mode.

  When the power is turned on and the monitoring device 70 is driven, the mode setting unit 74 determines whether or not there is a mode setting operation using an ID card in S201. If there is a mode setting operation, the process proceeds to S202; otherwise, the process returns to S201.

  In S202, the ID code of the ID card input from the mode setting unit 74 is compared with the ID code stored in the storage unit 74. If they match, the process proceeds to S203 as authentication OK. If the ID codes do not match and authentication is NG, the process returns to S201.

If the authentication is OK in S202, in S203, the open / closed state of the window stored in the storage unit 74 is referred to and it is determined whether all the magnetic detection sensors are closed.
If it is determined that all the magnetic detection sensors are in the closed state, a monitoring mode is set in the storage unit 74 (S204), and monitoring of the magnetic detection sensors is started.
If there is at least one magnetic detection type magnet sensor that is in an open state (NO in S203), it is displayed in S210 that there is an open window, and the process returns to S201. Thereby, unless the magnetic detection type sensor determines that the window is sufficiently closed and transmits a close detection signal to the monitoring device 70, the monitoring device 70 does not set the monitoring mode. It is possible to prevent the monitoring mode from being set in a semi-closed state.

  Note that the display indicating that the window is open in S210 may be one in which the LED is lit and only that the window is open, or the open magnetic detection sensor in the storage unit 74. Based on the identification code, which window is specifically opened may be displayed. In particular, when a window is in a semi-closed state, it is difficult to determine at first glance where it is open, so if you display specifically which window is open, user convenience will improve. .

  When the monitoring mode is set in S204, it is determined whether an open detection signal is received from the magnetic detection sensor (S205). When the open detection signal is not received (S205 NO), it is determined whether or not there is a mode setting operation by the user in S206. If there is an input (YES in S205), the input ID code is compared with the ID code in the storage unit 74. If they match, the monitoring mode is set to the release mode (S108), and the process returns to S201.

On the other hand, when an open detection signal is received from the magnetic detection type sensor in S205 (S205 YES), the alarm unit 75 is activated (S211), a buzzer is sounded, and the process returns to S205.
The alarm unit 75 may be driven until the predetermined time has elapsed, or may be driven until the release mode is set in S208.

  If the mode setting operation is not performed in S206 (NO in S206), and if the authentication of the ID code input in S207 is NG (S207 NO), the process returns to S205 to continuously monitor the opening / closing of the window. Become.

In addition, you may perform the display by the display part 76 in the monitoring apparatus 70 of S210 by providing display parts, such as LED, in a magnetic detection type sensor.
Specifically, when the state of the switch unit 52 changes from ON to OFF in S101 of FIG. 3 or when it is determined in S105 of FIG. 3 that the window is not sufficiently closed (NO in S105). The display unit is driven. And when it determines with the window being fully closed in S105 (S105YES), the display of a display part will be stopped. As a result, the user does not have to confirm with the monitoring device 70 which magnetic detection type sensor is open, but only by checking the display of the magnetic detection type sensor attached to the window, which window is open. Since it is possible to know immediately whether it is open, the convenience is further improved.

  In S101 of FIG. 3, since it can be easily determined that the window is open, the display unit is not driven, and only when it is determined in S105 that the window is not sufficiently closed (NO in S105). By driving the unit, it is possible to realize a magnetic detection sensor that achieves both low power consumption and user convenience.

Further, if the value of the closing strength (TH1) is set to a value larger than Hon in FIG. 6 (the magnetic field strength when the switch unit 52 detects a change from OFF to ON), the switch unit 52 has. The semi-closed state caused by the hysteresis characteristic can be eliminated.
The hysteresis characteristic is a property that it is difficult to turn OFF once the switch unit 52 is turned ON. That is, when the user closes the window strongly and the window hits the window frame (103 in FIG. 7) and rebounds slightly, the switch unit 52 is once turned on, so that a semi-closed state is particularly likely to occur.
Therefore, if the closing strength (TH1) is set to a value that is at least larger than Hon and smaller than Hmax, a semi-closed state due to the hysteresis characteristic of the switch unit 52 is eliminated, and a magnetic detection type sensor that compensates for the drawbacks of the switch unit 52. Can be provided.

  In addition, when the monitoring device 70 receives an open detection signal from the magnetic detection sensor while in the monitoring mode, the monitoring device 70 may transmit that fact to a remote monitoring sensor through a general public line or the like.

  In the embodiment, the case where a plurality of magnetic detection sensors are connected to the monitoring device 70 has been described. However, other various security sensors may be connected. Examples of the security sensor include an infrared sensor that measures the amount of received infrared light and detects an intruder from the amount of change, and an image sensor that images a monitoring area and detects the intruder from the amount of change in the captured image. is there.

It is a block block diagram of the magnetic detection type sensor which concerns on this invention. It is a block block diagram of the monitoring apparatus which monitors the state of the magnetic detection type sensor which concerns on this invention. It is a figure which shows the operation | movement flow (1) of the magnetic detection type sensor which concerns on this invention. It is a figure which shows the operation | movement flow (2) of the magnetic detection type sensor which concerns on this invention. It is a figure which shows the monitoring flow of the monitoring apparatus which monitors the state of the magnetic detection type sensor which concerns on this invention. It is a figure which shows the relationship between the state of a switch part, and the strength of the magnetic field which a switch part receives. It is a schematic diagram which shows one example of installation when the magnetic detection type sensor which concerns on this invention is installed in a sliding window. It is a figure which shows the conventional magnetic detection type sensor.

Explanation of symbols

50 detection unit 52 switch unit 53 magnetic field measurement unit 60 magnet 70 monitoring device

Claims (6)

A magnetic detection sensor comprising a magnet installed on a movable member such as a window or a door, and a detection unit installed at a position facing the magnet in a state where the movable member is closed,
The detection unit is
A switch part that is turned on when the magnet is in proximity and turned off when the magnet is separated;
A magnetic field measurement unit for measuring the strength of the magnetic field;
A storage unit for storing, as a closing strength, a value that is at least larger than the magnetic field strength at which the switch unit changes from ON to OFF;
Control including closing determination means for determining that the movable member is closed when the switch unit is ON and the strength of the magnetic field obtained from the magnetic field measurement unit exceeds the closing strength And
An output unit for outputting a determination result of the control unit;
A magnetic detection sensor characterized by comprising: And a battery for supplying power to the detection unit,
The magnetic detection sensor according to claim 1, wherein the control unit includes a first activation unit that activates the magnetic field measurement unit by the closing determination unit when the switch unit detects a change from OFF to ON. Furthermore, it has a time measuring unit for measuring a predetermined time when the switch unit detects ON,
3. The magnetic detection type sensor according to claim 1, wherein the control unit includes a second activation unit that activates the magnetic field measurement unit by the closing determination unit at predetermined time intervals measured by the timing unit.   Further, the control unit is configured to determine a plan action based on the strength of the magnetic field obtained from the magnetic field measurement unit when the closing determination unit determines that the movable member is closed. The magnetic detection type sensor according to any one of claims 1 to 3, further comprising setting means for setting as follows.   5. The magnetism according to claim 1, wherein the closing strength is smaller than a magnetic field strength applied to the switch unit by the magnet in a state where the movable member is completely closed. Detection type sensor. Furthermore, the said control part contains the open determination means which determines that the said movable member is open when the said switch part detects the change from ON to OFF. The magnetic detection type sensor according to item.

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