JP2006190063A - Magnetic detection sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic detection sensor capable of surely detecting a maneuvering action even in a case that a detection unit is set in a place where it is visually confirmable from the outside. <P>SOLUTION: A control part 51 performing determination processing based on outputs from a switch part 52 and a magnetic field measuring part 53 comprises a reference setting means storing the intensity of magnetic field measured by the magnetic field measuring means 53 in a state where detection of the switch part 25 is in a closed state as a reference value to a storage part 54; and a determination means determining the presence of a maneuvering action in a case that the difference between the intensity of magnetic field obtained from the magnetic field measuring part 53 and the reference value exceeds a determination value. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention detects a proximity of a permanent magnet and switches a switch to an ON or OFF state. For example, a magnetic detection type sensor used for detecting an opening / closing of a door or a window to activate an alarm About.

FIG. 1 is a diagram for explaining a conventional magnetic detection type sensor described in Patent Document 1. In FIG.
This magnetic detection type sensor detects the proximity of the magnet 24 and the reed switch 42 in the detection unit 40 switches. 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. 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 that the normally closed contact NC is connected.
The current monitoring circuit 16 of the monitoring unit 10 monitors the current applied to the detection unit 40. 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. Let

FIG. 2 is a diagram showing an installation location of a conventional magnetic detection type sensor.
The figure shows an example of the installation location of the detection unit 40 and the magnet 24 in a conventional magnetic detection type sensor. The detection unit 40 is attached to the door frame (or window frame) 100 of each room as shown in FIG. Correspondingly, a magnet 24 is attached to the door 110 at a position facing the detection unit 40 when the door is closed. Therefore, in the detection unit 40, the C-NO is connected by the magnetic action of the magnet 24 while the door 110 is closed, and the magnetic action of the magnet 24 is lost and the C-NC is connected when the door 110 is opened. .

JP-A-9-245266

FIG. 3 is a diagram showing a state of installation of the magnetic detection type sensor in the sliding-type window.
When the magnetic detection type sensor is installed in the sliding window (door) or the raising / lowering window (door), the detection unit 40 is not attached to the door frame (or window frame) 100 as shown in FIG. May be attached.

  Specifically, among a plurality of sashes, a detection unit 40 capable of wireless transmission is attached to the outer surface of the sash 31 that is a movable member on the indoor side (the surface with the crescent lock 34), and the sash that is a movable member on the outdoor side. A magnet 24 is installed on the glass surface 33 of 32 at a position facing the detection unit 40.

  The reason for installing in this way is that when a magnetic detection type sensor is installed as shown in FIG. 2, a sensor is required for each window in order to detect opening and closing of the window. That is, it is necessary to provide the magnets 24 on the sash 31 and the sash 32, and to arrange two detection units 40 on the window frame (not shown in FIG. 3) so as to face the magnets 24, respectively. As a result, the system cost increases and the indoor aesthetics are impaired.

  However, the magnetic detection sensor attached in this way has a problem that it is possible to visually recognize the installation location of the detection unit 40 from the outside. Then, by using another magnet, it is possible to perform an action (hereinafter referred to as “planning action”) that the magnetic detection type sensor does not detect even when the window (door) is opened. End up.

FIG. 4 is a diagram for explaining a plan action to be performed on a conventional magnetic detection type sensor.
A specific example of the plan action will be shown with reference to FIG.
The magnetic detection type sensor described in Patent Document 1 has a type having a transfer contact, but FIG. 4 shows a type having a make contact. Any type of contact can be used in the same way.
In the case of a magnetic detection type sensor having a make contact, as shown in FIGS. 4A and 4B, when the magnet 24 is in the vicinity, the reed switch 42 is turned ON, and when it is not in the vicinity, it is turned OFF. Become. This detects opening and closing.

  When the planning action is performed, first, as shown in FIG. 4C, the planning magnet 25 is positioned from the outside so that the detection unit 40 is affected by the magnetic field. Then, the window is opened while maintaining the state. Then, even if the magnet 24 moves and the influence of the magnetic field does not affect the detection unit 40, the planning magnet 25 still continues to influence the magnetic field on the detection unit 40. The contact of the switch 42 is not turned off. Therefore, in this case, the detection unit 40 cannot detect that the window has been opened.

Thus, when the detection unit 40 of the magnetic detection type sensor is installed at a position where it can be visually recognized from the outside, the planner magnet 25 is easily arranged at a position where the detection unit 40 cannot detect that the window has been opened. There was a problem of being able to.
Therefore, an object of the present invention is to provide a magnetic detection type sensor that can reliably detect a plan action even if it is a magnetic detection type sensor installed in a place where the detection unit can be visually recognized from the outside. It is in.

  The magnetic detection type sensor of the present invention is a magnetic detection type 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 when the movable member is closed. The detection unit includes a switch unit that detects the open or closed state of the movable member under the influence of a magnetic field generated from the magnet, a magnetic field measurement unit that measures the strength of the magnetic field, and an output from the switch unit and the magnetic field measurement unit. And a reference value used for the determination process of the control unit and a determination value based on the strength of the magnetic field more than detecting a change from the closed state to the open state of the switch unit A storage unit, and an output unit that outputs a determination result of the control unit, and the control unit stores, as a reference value, the strength of the magnetic field measured by the magnetic field measurement unit when the detection of the switch unit is in a closed state. In the section A reference setting means for, characterized in that the difference between the strength and the reference value of the magnetic field resulting from the magnetic field measuring unit includes a determination means for determining presence of orchestrated action exceeds the judgment value.

  The magnetic detection type sensor of the present invention is a magnetic detection type 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 when the movable member is closed. The detection unit includes a switch unit that detects the open or closed state of the movable member under the influence of a magnetic field generated from the magnet, a magnetic field measurement unit that measures the strength of the magnetic field, and an output from the switch unit and the magnetic field measurement unit. Obtained from the control unit that performs the determination process based on the control unit, the reference value used in the determination process of the control unit and the determination value based on the strength of the magnetic field received by the switch unit from the magnet, and the magnetic field measurement unit When the strength of the magnetic field exceeds a value obtained by adding the determination value to the reference value, the timer has a time measuring unit that outputs a predetermined time, and an output unit that outputs the determination result of the control unit. The control unit detects the switch unit. Reference setting means for storing the magnetic field strength measured by the magnetic field measurement unit as a reference value in the storage unit when the is in a closed state, and the maximum value of the magnetic field strength obtained from the magnetic field measurement unit during timing of the time measurement unit When there is a decrease in the magnetic field strength greater than the judgment value from the maximum value of the magnetic field strength obtained from the maximum value detection means during the time counting of the time measuring unit, Determining means for determining.

  In the magnetic detection type sensor of the present invention, the reference setting means further uses the strength of the magnetic field obtained from the magnetic field measurement section when the timing section is measuring time as long as the determination section does not determine the presence of the planning action. Update as a value.

  In the magnetic detection type sensor of the present invention, the determination means further determines the presence of the planning action when the strength of the magnetic field obtained from the magnetic field measurement unit is below a value obtained by subtracting the determination value from the reference value.

  In the magnetic detection sensor of the present invention, the storage unit further stores a closing strength that is at least stronger than the strength of the magnetic field for detecting a change from the open state to the closed state of the switch unit, and the reference setting means has the switch unit open. If the strength of the magnetic field obtained from the magnetic field measurement unit exceeds the closing strength when the state changes to the closed state, the reference value is updated.

  In the magnetic detection type sensor of the present invention, the magnet and the detection unit are further installed on different movable members, and the output unit of the detection unit transmits a determination result from the determination means by a radio signal.

  In the present invention, when the planning magnet having a magnetic field intensity exceeding the magnitude that can hold the detection of the switch portion in the closed state even when the movable member is opened, the movable member is moved by the determination means when the movable portion is positioned near the switch portion. Is determined to be open. Thereby, even if it is going to open a movable member by making a switch part into a non-sensing state by use of a planning magnet, it can detect that a movable member was in an open state. Therefore, even if it is a magnetic detection type sensor installed in a place where the detection unit can be visually recognized from the outside, there is an effect that the plan action can be reliably detected.

Embodiments of a magnetic detection sensor according to the present invention will be described below with reference to the drawings.
FIG. 5 is a block diagram of the magnetic detection type sensor according to the present invention.
The magnetic detection type sensor is composed of a detection unit 40 and a magnet 24, and in this embodiment, it is assumed to be installed in the same manner as in FIG.

The control unit 51 includes reference setting means and determination means, and controls each part of the detection unit 40.
The switch unit 52 is a reed switch that detects the proximity of the magnet 24. This may have a transfer contact or may have a make contact. When the magnet 24 approaches the detection unit 40, the switch unit 52 is turned on, and when it is separated, it is turned off.
The magnetic field measurement unit 53 measures the strength (or magnetic flux density, etc.) of the 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. An MR element, a Hall element, a Hall IC, and the like are used for measuring the strength of the external magnetic field.

The storage unit 54 stores the operation program of the control unit 51, the reference value set by the reference setting means in the control unit 51, the determination value, the open / closed state of the window, and the like. The determination value is a value that gives a design margin to the strength of the magnetic field measured by the magnetic field measurement unit from the magnet 24 when the window is closed.
The output unit 55 wirelessly transmits a signal from the determination unit in the control unit 51 to a monitoring unit that monitors the state of a magnetic detection sensor described later. The reason for transmitting wirelessly is that when the detection unit 40 is installed in the sliding window or the raising / lowering window of FIG. 3, there is an advantage that the wiring does not get in the way when the window is opened and closed.
The timer 56 measures a predetermined time.
The battery 57 supplies power for driving the detection unit 40.

6 and 7 are operation flows of the magnetic detection type sensor.
With reference to these drawings, an operation flow of the control unit 51 in the detection unit 40 will be described.
First, the state of the switch unit 52 is determined, and the process is branched according to the determination result (S601). (A) When there is no change in the state of the switch unit 52, the process returns to S601. (B) When the state of the switch unit 52 changes from OFF to ON, the process proceeds to S602. (C) The state of the switch unit 52 is changed from ON. If changed to OFF, the process proceeds to S618.

In the case of (C), it is determined that the window has been opened, and an open detection signal is transmitted from the output unit 55 to the monitoring unit described later (S618), and the open state is stored in the storage unit 54 (S619), and the process returns to S601. .
In the case of (B), the first predetermined time (T1) is measured (S602, S603). The first predetermined time is measured in order to measure the strength of the magnetic field when it is considered that the window is closed and the movement of the window is completely stopped. Therefore, T1 may be about several seconds.

  When T1 is measured in S602 and S603, the magnetic field strength measured by the magnetic field measurement unit 53 is sampled, and the absolute value (H0) is temporarily stored in the storage unit 54 as a reference candidate value (S604). This sampling is performed three times at short intervals, and the absolute value of the average value of the three sample values obtained is temporarily stored as a reference candidate value (H0).

  Next, it is determined from the temporarily stored reference candidate value whether or not the window is closed. Specifically, it is determined whether or not the reference candidate value (H0) obtained in S604 is larger than a third threshold (TH3) as a predetermined closing strength (S605). When H0> TH3, the reference candidate value (H0) is stored as a reference value (S606), and a close detection signal indicating that the window is closed is transmitted to the monitoring unit described later (S607). Then, the closed state is stored in the storage unit 54 (S608). Threshold values (TH1, TH2), which will be described later, for detecting the plan action are calculated based on this reference value (H0). If not H0> TH3, the process returns to S601.

  By performing this determination, the processing from S606 onward is executed in a state where the switch unit 52 is ON even though the window is not completely closed (hereinafter referred to as “half-tightened state”). Can be prevented. In other words, due to the hysteresis characteristics of the switch section 52, the switch section 52 is unstable due to the “half-tight state” that occurs because the magnetic field strength that changes from OFF to ON differs from the magnetic field intensity that changes from ON to OFF. It is possible to prevent an intermediate value between the strengths of both magnetic fields from becoming the reference value.

FIG. 8 is a diagram illustrating the hysteresis characteristics of the switch unit 52.
Hereinafter, the hysteresis characteristics of the switch unit 52 will be described with reference to FIG.
As shown in the figure, the switch unit 52 has a hysteresis characteristic that differs between the magnetic field strength Hon when switching from OFF to ON and the magnetic field strength Hoff when switching from ON to OFF.

  The strength of the magnetic field in the magnetic field measurement unit 53 when the window is completely open is smaller than Hoff. When the window is closed, the magnetic field strength in the magnetic field measurement unit 53 changes to a state larger than Hon, and the switch unit 52 is switched from OFF to ON. This is a normal operation relationship between the window and the switch unit 52. On the other hand, when the window is tightly closed and the window bounces back when it hits the window frame, the window may open slightly and stop. At this time, if the strength of the magnetic field is between Hoff and Hon, the switch unit 52 remains in the ON state, and it is determined that the switch unit 52 is in the closed state (unless the process S605 is executed). This is the semi-tight state described above.

When the reference value (H0) is stored when the window is in the half-tight state, the first threshold value (TH1) described later is set to a smaller value than the value set when the window is completely closed. Will be set. As a result, when the window is completely closed from the half-tight state, the magnetic field strength exceeding the first threshold (TH1) may be detected, and it is erroneously determined as a plan action even though it is not a plan action. There are things to do.
Therefore, it is determined in the process of S605 that the temporarily stored reference candidate value (H0) is obtained when the window is completely closed, and the processes after S606 are executed.

A method of determining the third threshold value (TH3) as the predetermined closing strength will be described below.
TH3 is determined in consideration of variations in the component performance of the switch unit 52 and fluctuations in magnetic field strength due to environmental factors.

  The variation in the component performance of the switch unit 52 means that even if the same type of component is used, the values of Hoff and Hon shown in FIG. 8 vary. The variations in Hoff and Hon are obtained experimentally.

  The environmental factor is, for example, wind or vibration caused by a car passing in the vicinity. The closed window or door is shaken by these influences, and the strength of the magnetic field in the magnetic field measuring unit 53 varies. Variations in the strength of the magnetic field due to environmental factors are also experimentally required for various types of windows and doors.

The dotted line in FIG. 8 shows variations in the component performance in the switch 52 and fluctuations in the magnetic field strength due to environmental factors.
Here, ΔHon is a range of values that Hon takes due to variations in component performance in the switch unit 52. Although Hoff has the same width, FIG. 8 shows only the width of Hon necessary for the description. The hysteresis characteristic of the switch unit 52 is obtained by an experiment in which the magnet 24 is moved closer to or away from the detection unit 40. By performing this experiment for a plurality of detection units 40, a range that Hon can take is obtained. In the figure, Hon_min and Hon_max are the minimum value and the maximum value of Hon measured by the magnetic field measurement unit 53, respectively.

  Further, ΔHe is the width of fluctuation of the magnetic field strength (He) due to environmental factors when the window or door is closed. A range He_min ≦ He ≦ He_max of He is obtained by an experiment in which the absolute value of the strength of the magnetic field obtained from the magnetic field measuring unit 53 is measured by applying wind or vibration with the window or door closed. Here, He_min and He_max are the minimum value and the maximum value of the experimental values in the magnetic field measurement unit 53, respectively.

The necessary condition for the temporarily stored reference candidate value (H0) to be obtained when the window is completely closed is H0> Hon_max, as is apparent from FIG.
Therefore, the process may proceed to the processing after S606 when at least H0> Hon_max is satisfied.

Therefore, the third threshold (TH3) used in the determination branch of S605 is
TH3 ≧ Hon_max (1)
It is necessary to satisfy. That is, TH3 must be set to a value that is at least larger than the strength of the magnetic field for detecting the change of the switch unit 52 from the open state to the closed state.
When an appropriate value of TH3 that satisfies this condition is selected and H0> TH3 is established in the determination in S605, it is determined that the window is not half-tight but closed, and the process proceeds to S606 and subsequent steps.

  In order to proceed to the processing after S606 in a state in which it is recognized that the window is completely closed in the determination of S605 (H0> TH3), the value of TH3 should be as large as possible within the range satisfying Expression (1). It is desirable to set. However, if a very large value is selected as the value of TH3, there is a disadvantage that it is determined that the window is not closed even though the window is closed. It is necessary to keep.

If possible, based on the absolute value H (the range is He_min ≦ H ≦ He_max) of the strength of the magnetic field that is considered to be measured by the magnetic field measurement unit 53 when the window is in a closed state under the actual use environment. The value of TH3 should be set, but TH3 is set to TH3 = He_min + α (α> 0) (2)
If a large value such as this is set, it is not determined that the window is closed in S605 even though the window is completely closed, and there is a possibility that inconvenience that the process cannot proceed to S606 and subsequent steps may occur. Get higher.

Therefore, the third threshold (TH3) used in the determination branch of S605 is
TH3 ≦ He_min (3)
It is necessary to satisfy.
Therefore, the third threshold value (TH3) is obtained from the equations (1) and (3).
Hon_max ≦ TH3 ≦ He_min (4)
It shall be set within the range that satisfies the above.

  If TH3 is set to a large value within a range that satisfies Expression (4), it is possible to strictly determine the closing of the window. In addition, if TH3 is set to a small value within this range, it is determined that the window is not closed in S605 even though the window is closed, and there is a problem that it is not possible to proceed to the processing after S606. The possibility can be reduced.

If H0> TH3 in S605, the reference candidate value (H0) is stored in the storage unit 54 as a reference value (S606). Then, a closing detection signal indicating that the window is closed is transmitted to a monitoring unit described later (S607), the closed state is stored in the storage unit 54 (S608), and the process proceeds to S609 and subsequent steps.
In this case, based on the reference value (H0) stored in S606, the first threshold value (TH1) and the second threshold value (TH2) are respectively set according to the equation (6 ′) and the equation (7 ′) described below. The data is set and stored in the storage unit 54 (S609).

Here, how to determine the values of TH1 and TH2 will be described.
The strength of the magnetic field of the magnet 25 that performs the planning action so that the switch section 52 is not turned off when the window is opened is that the switching section 52 is turned on by the planning magnet 25 alone when the magnetic field of the regular magnet 24 is lost. It is considered that the value can be held at least in the state (see FIG. 4C). That is, the strength of the magnetic field that can be planned by the planning magnet 25 is larger than Hoff, as is apparent from FIG.

Further, when the planning magnet 25 is brought close to a closed window to perform the planning action, the measured total magnetic field strength (H) and the normal magnetic field strength (H0) It is considered that the difference is roughly the strength of the magnetic field of the planner magnet 25.
Therefore, the conditions under which the planning magnet 25 can plan are:
| H-H0 |> Hoff (5)
⇔
H-H0> Hoff or H-H0 <-Hoff
⇔
H> H0 + Hoff or H <H0−Hoff (5 ′)
It is.

Based on the above consideration, it is possible to perform the planning action while the switch unit 52 is kept on only when the measured magnetic field strength H satisfies the equation (5 ′). ≒ H0 + Hoff (6)
TH2≈H0−Hoff (7)
According to the first and second thresholds,
H> TH1 or H <TH2 (5 ″)
It is determined that the plan action has been performed with the establishment of.

Strictly speaking, the first and second threshold values are respectively
TH1 = H0 + (Hoff + ε1) (6 ′)
TH2 = H0− (Hoff + ε2) (7 ′)
(The signs of ε1 and ε2 are not necessarily positive). ε1 and ε2 are changes in the component performance of the switch unit 52, the magnetic field measurement unit 53, and the magnet 24, and changes in the magnetic field strength when other magnets having various magnetic field strengths are superimposed on the sensor magnet 24. It is determined experimentally in consideration of the rate. Accordingly, the determination value is Hoff + ε1 in Expression (6 ′) or Hoff + ε2 in Expression (7 ′).

  After setting the threshold value in S609, the second predetermined time (T2) is counted (S610, S612), and the state of the switch unit 52 is determined in this timing loop (S611). When the state of the switch unit 52 changes from ON to OFF, it is determined that the time loop has been exited and the window has been opened, and an open detection signal is transmitted from the output unit 55 to the monitoring unit described later (S618). The state is stored in the storage unit 54 (S619), and the process returns to S601.

  If the process does not escape from the timed loop to S618, the magnetic field strength measured by the magnetic field measurement unit 53 is sampled to obtain the absolute value (H) (S613), and the equation (5 '') It is determined whether or not is established (S614).

When the formula (5 ″) is established in S614, if the closed state is stored (YES in S615), an open detection signal is transmitted from the output unit 55 to the monitoring unit described later (S616), and the open state is stored in the storage unit. 54 (S617). Then, the process proceeds to S610.
In S614, if the expression (5 ″) is not satisfied, if the open state is stored (YES in S620), a close detection signal is transmitted to the monitoring unit described later (S621), and the close state is stored in the storage unit 54. (S622). Then, the process proceeds to S610.

Next, the configuration of the monitoring unit (not shown) will be described.
The monitoring unit includes a mode setting unit that enables the user to monitor the magnetic detection sensor, a reception unit that receives a signal from the magnetic detection sensor, and a signal (related to the open / closed state of the window) from the magnetic detection sensor. And a storage unit for storing the mode, an alarm unit for informing the opening of the window with a buzzer, a display unit, and a monitoring control unit for controlling them.

Next, the operation of the monitoring unit will be described.
The receiving unit receives the open detection signal and the close detection signal from the magnetic detection type sensor, and the open / close state of the window and the like are stored in the storage unit based on these signals.
When monitoring of the magnetic detection type sensor is effectively set by the mode setting unit, the storage unit refers to whether or not the magnetic detection type sensor is in a closed state.

If it is closed, the monitoring set mode is stored. If it is in the open state, a display indicating that the window is not closed is performed on the display unit. Thereby, even if the user recognizes that the window is closed, the user can recognize that the window is incompletely closed, and the window can be completely closed.
When the monitoring set mode is stored, when the receiving unit receives an open detection signal, the alarm unit is driven, and the display unit displays that the window has been opened.
In addition, as will be described later, when the detection of the planning action in the magnetic detection type sensor is transmitted separately from the normal open (closed) detection signal, a display to that effect may be performed separately.

Next, a timing chart in which the magnetic detection sensor according to the present invention detects a plan action will be described.
FIG. 9 is a timing chart for detecting a plan to be performed after the reference value is stored.
When the sash 31 and the sash 32 are in the closed state, the switch unit 52 is turned on and times T1.

  After the lapse of T1, the magnetic field strength measured by the magnetic field measurement unit 53 is sampled, and if the absolute value exceeds TH3, it is stored as a reference value (H0). In this embodiment, three consecutive samplings are performed at short intervals, and if the average absolute value exceeds TH3, it is stored as the reference value (H0). Thereby, the influence of noise etc. can be prevented and an appropriate reference value can be set.

Thus, when the reference value (H0) indicating that the sash is not half-tightened is stored, the first threshold value (TH1) and the second threshold value (TH2) are set.
Thereafter, every time T2 elapses, the strength of the magnetic field is measured, and the absolute value (H) is compared with TH1 and TH2.

  At this time, it is assumed that the planner magnet 25 is brought close to the detection unit 40. Then, the absolute value (H) of the magnetic field intensity measured by the magnetic field measurement unit 53 takes a value in a range that satisfies the equation (5 ′). When H has the strength of the magnetic field that can be planned, TH1 and TH2 are determined so as to satisfy the expression (5 ″), so that the planning action is detected and an open detection signal is transmitted to the monitoring unit.

FIG. 10 is a timing chart for detecting a plan to be performed before the reference value is stored.
First, it is assumed that the planning magnet 25 is attached to the magnet 24 when the sash 31 and the sash 32 are open.

  When the sash is closed, the predetermined time T1 is counted. If the absolute value of the magnetic field intensity measured by the magnetic field measurement unit 53 after T1 has passed exceeds TH3, that value is stored as a reference value (H0). At this time, the reference value (H0) itself is a value obtained from both the magnet 24 and the planning magnet 25, so that the planning is not detected.

Then, a first threshold value (TH1) and a second threshold value (TH2) are set.
Thereafter, the magnetic field strength is measured every time T2 elapses, and the absolute value (H) of the magnetic field strength is compared with TH1 and TH2.

It is assumed that the sash is opened at this time.
When the sash is opened, the magnetic field that affects the detection unit 40 is only the magnetic field of the planning magnet. Therefore, the magnitude of the change in the strength of the magnetic field at this time is roughly the strength of the magnetic field of the regular magnet 24 ( Hn).

That is, at this time
| H−H0 | = Hn (8)
Is established.
By the way, when the sash is closed, the switch unit 52 must be in the ON state. Therefore, the apparatus is designed so that the magnetic field strength (Hn) of the regular magnet 24 satisfies Hn> Hon. (See FIG. 8). From this and Hon> Hoff, Hn> Hoff holds.

Therefore, from the equation (8), regarding the strength (H) of the magnetic field when there is no regular magnet 24 and only the planning magnet is present,
| H-H0 |> Hoff (9)
⇔
H-H0> Hoff or H-H0 <-Hoff
⇔
H> H0 + Hoff or H <H0−Hoff (9 ′)
Is established.
This is the same formula as formula (5 ′).

  The magnetic field strength (H) when the regular magnet 24 is eliminated and only the planning magnet is present also takes a value in a range that satisfies the equation (5 '). Since TH1 and TH2 are determined in advance so as to detect that H is in this range, the plan action is detected and an open detection signal is transmitted to the monitoring unit.

That is, as the first and second threshold values used for “when detecting an action taken before the reference value is stored”, the first threshold used for “when detecting an action executed after the reference value is stored”. The same value as the second threshold value can be used.
Therefore, the method for detecting the plan according to the threshold values calculated by the formulas (6 ′) and (7 ′) and the operation flow of FIGS. 6 and 7 can be used regardless of the state of the windows or doors. It was shown that it can be detected.

  By the way, with respect to ε1 and ε2 in the equations (6 ′) and (7 ′), the change rate of the magnetic field when the sensor magnet 24 is removed from another magnet and the magnet 24 of the superimposed sensor is also taken into consideration. Determine experimentally.

  In the first embodiment, the reference value (H0) is set as a trigger when the state of the switch unit 52 changes from OFF to ON, but the user specifies the timing for setting the reference value. May be.

For example, a reference value setting mode can be provided in the mode setting unit of the monitoring unit, and the reference value can be stored when the user selects this mode. It is also conceivable to provide the reference value setting mode not on the monitoring unit but on the magnetic detection type sensor side.
Further, the reference value can be stored when the user selects the monitoring set mode in the mode setting unit of the monitoring unit.

The operation flow in the second embodiment in which the user designates the timing for setting the reference value as described above will be described below. The method for determining the values of TH1, TH2, and TH3 in the second embodiment is the same as that in the first embodiment.
FIG. 11 is a reference value storing flow.
With reference to the figure, the operation | movement flow of the control part 51 in the detection unit 40 is demonstrated.
As described above, this flow starts when the user selects the reference value setting mode or the monitoring set mode.

First, it is determined whether or not the switch unit 52 is in the ON state (S1101). If it is ON, the process proceeds to S1102, and if not, the process returns to S1101.
If the switch unit 52 is in the ON state in S1101, the magnetic field intensity measured by the magnetic field measurement unit 53 is sampled, and the absolute value is temporarily stored in the storage unit 54 (S1102). This sampling is performed three times at short intervals, and the absolute value of the average value of the three sample values obtained is temporarily stored as a reference candidate value (H0).

  Next, it is determined whether or not the window is closed. Specifically, it is determined whether or not the reference candidate value (H0) obtained in S1102 is larger than the third threshold value (TH3) (S1103). If H0> TH3, the process proceeds to S1104. Otherwise, the process returns to S1101.

  If H0> TH3 in S1103, the reference candidate value (H0) obtained in S1102 is stored in the storage unit 54 as a reference value (S1104). Then, the first threshold value (TH1) and the second threshold value (TH2) are set according to the equations (6 ′) and (7 ′), respectively, and stored in the storage unit 54 (S1105), and the reference value is stored. End the flow.

12 and 13 are monitoring flows of the magnetic detection type sensor.
With reference to these drawings, an operation flow of the control unit 51 in the detection unit 40 will be described.
First, the state of the switch unit 52 is determined, and the process is branched according to the determination result (S1201). (A) If there is no change in the state of the switch unit 52, the process returns to S1201, (B) if the state of the switch unit 52 changes from OFF to ON, the process proceeds to S1202, and (C) the state of the switch unit 52 is changed from ON. If it has changed to OFF, the process proceeds to S1216.

In the case of (C), it is determined that the window has been opened, and an open detection signal is transmitted from the output unit 55 to the monitoring unit (S1216), and the open state is stored in the storage unit 54 (S1217), and the process returns to S1201.
In the case of (B), it is determined whether or not the window is closed. Specifically, it is determined whether or not the absolute value (H) of the magnetic field strength sampled after the first predetermined time (T1) has elapsed is greater than the third threshold (TH3) (S1205). When H> TH3, a closing detection signal is transmitted from the output unit 55 to the monitoring unit (S1206), and the closed state is stored in the storage unit 54 (S1207). If not H> TH3, the process returns to S1201.

  After completion of S1207, the second predetermined time (T2) is counted (S1208, S1210), and the state of the switch unit 52 is determined in this timing loop (S1209). When the state of the switch unit 52 is changed from ON to OFF, it is determined that the time loop is exited and the window is opened, and an open detection signal is transmitted from the output unit 55 to the monitoring unit (S1216). It memorize | stores in the memory | storage part 54 (S1217), and returns to S1201.

  If the process does not escape from the timed loop to S1216, the magnetic field strength measured by the magnetic field measurement unit 53 is sampled to obtain the absolute value (H) (S1211), and the equation (5 ″) Whether or not is satisfied is determined (S1212).

If the closed state is stored when Expression (5 ″) is established (S1213Y), an open detection signal is transmitted from the output unit 55 to the monitoring unit (S1214), and the open state is stored in the storage unit 54. (S1215). Then, the process proceeds to S1208.
If the expression (5 ″) is not satisfied in S1212, if the open state is stored (Y in S1218), a close detection signal is transmitted to the monitoring unit (S1219), and the close state is stored in the storage unit 54. (S1220). Then, the process proceeds to S1208.

  The block diagram of the magnetic detection type sensor in the third embodiment is the same as the block diagram of the magnetic detection type sensor in the first embodiment shown in FIG. 5, but the controller 51 functions as a maximum value detecting means. Has been added. Further, the operation flow of the control unit 51 is different from that of the first embodiment in that an operation for determining the presence or absence of a plan action is performed as shown in FIG.

FIG. 14 is a part of an operation flow of the magnetic detection type sensor.
The third embodiment will be described below with reference to FIG.
FIG. 14 shows only processing portions different from those in the first embodiment. Specifically, it is the processing after S613 in FIG.

In the first and second embodiments, it is determined that there is a plan action when the expression (5 ″) is established.
In the third embodiment, in the formula (5 ″),
H <TH2 (10)
Is established (YES at S630), the process proceeds to S631.
If the closed state is stored (YES at S631), an open detection signal is transmitted (S632), the open state is stored in the storage unit 54 (S633), and the process returns to S610 in FIG.
If the closed state is not stored (S631 NO), the process returns to S610 in FIG.

On the other hand, in formula (5 ''),
H> TH1 (11)
When is established (YES in S634), the open detection signal is not transmitted immediately.

The reason for this will be described with reference to FIG.
In the first and second embodiments, it is determined that the window is closed at the third threshold value (TH3) equal to or less than He_min. However, when the device of the present invention is used in an actual environment, the absolute value H of the magnetic field strength may be in the range of He_min ≦ H ≦ He_max when the window is closed.

  That is, considering the actual use environment, there is no absolute guarantee that TH3 is set to exceed the strength of the magnetic field when the window is completely closed. Therefore, in the first and second embodiments, although the reference value (H0) is set under the condition of H> TH3, the reference value (H0) is set with the window slightly opened. The situation is still conceivable.

  In this situation, when the user closes the window more closely (hereinafter referred to as “increase and close”), the magnetic field strength in the magnetic field measurement unit 53 further increases from the reference value, and thus the expression (11) is obtained. May be satisfied. In this case, in the first and second embodiments, it is erroneously determined that there is a plan action.

Therefore, referring back to FIG. 14, in the third embodiment, the following processing is executed.
When the expression (11) is established (YES in S634), the timer 56 starts measuring the third predetermined time (T3) and the second predetermined time (T2) (S635, S636). However, T3 >> T2.
In the loop from S636 to S638, it is determined whether or not the switch unit 52 is OFF (S637). If it is OFF, the window is open, and the process proceeds to S618 in FIG.

  When T2 elapses in S638 and the process proceeds from S636 to S638 without proceeding to S618, the magnetic field strength from the magnetic field measurement unit 53 is sampled, and the absolute value (H) is temporarily stored in the storage unit 54. (S639).

  As long as the determination in S637 and S641 described later is not YES and the measurement of the third predetermined time (T3) in the loop of S635 to S642 continues, this sampling is performed every second predetermined time (T2) interval. . When a sample value of H at time T2 * n (n is a positive integer) is expressed as H (T2 * n), a numerical sequence {H (T2 * n)} is stored in the storage unit 54 by this sampling and storage.

Next, the maximum value detection means of the control unit 51 detects the maximum value (Hmax) from the term of the sequence {H (T2 * n)} of the absolute value of the magnetic field strength temporarily stored from the start of T3 timing. (S640).
And using the fourth threshold (TH4),
Hmax−H> TH4 (12)
Whether or not is satisfied is determined (S641).
However, H in the above equation is the last term of the sequence {H (T2 * n)}. When Expression (12) is established (YES in S641), it is determined that there is a plan action, and the process proceeds to S631 and subsequent steps in which an open detection signal is transmitted from the output unit 55.

In addition to the establishment of Expression (11), the establishment of Expression (12) within the predetermined time T3 is a further condition for determining that the window is open for the following reason.
If the cause of the establishment of the formula (11) is not a closed action but a plan action, the person who performs the plan action installs the plan magnet 25 so that the direction of the magnetic field is the same as that of the regular magnet 24. It is thought that they are trying to break open.

In this case, after the value of H (T2 * n) exceeds TH1 and reaches the maximum value Hmax, the influence of the magnetic field of the magnet 24 does not reach the detection unit 40 by opening the window, and therefore decreases. Therefore, since the magnitude of this decrease is roughly the magnetic field strength (Hn) of the regular magnet 24, if the last term of the sequence {H (T2 * n)} is H,
Hmax−H = Hn (13)
Is established.

By the way, when the window is closed, the switch section 52 must be in the ON state, so that the magnetic field strength (Hn) of the regular magnet 24 satisfies Hn> Hon (> Hoff). The device is designed (see FIG. 8).
Therefore, the condition under which the planning action is performed under the condition that the expression (11) is established is, from the expression (13),
Hmax−H> Hoff (14)
It is.

For the above reason, only when the last term H of the sequence {H (T2 * n)} satisfies the expression (14), it can be determined that the planning action is performed under the condition that the expression (11) is satisfied. ,
TH4 = Hoff + δ (δ> 0) (15)
To define a fourth threshold,
Hmax−H> TH4 (12)
If it is established, it is determined that there is a plan action under the condition of Expression (11).

  It should be noted that the positive constant δ at TH4 in equation (15) is obtained experimentally in the same manner as the constants for determining other threshold values. TH4 may be the same value as a value obtained by subtracting TH2 from the reference value determined in S630 or a value obtained by subtracting the reference value from TH1 determined in S634. .

On the other hand, if equation (11) is not established within the predetermined time T3 even if equation (11) is established (YES in S642), it is determined that the cause of equation (11) being established in S634 is an additional closing by the user. Then, a reference value is set from one of the terms {H (T2 * n)} of the absolute value of the magnetic field strength temporarily stored from the start of T3 timing and stored in the storage unit 54 (S643). Then, the process proceeds to S609 in FIG. 6, and first and second threshold values are newly set and monitoring is continued.
At this time, the reference value is set by taking the average value of the top three values in the absolute value of the magnetic field strength value {H (T2 * n)} temporarily stored from the start of T3 timing as the reference value. Or the like.

  In the third embodiment, the determination that the window has been opened by the plan action is performed based on the expression (12). However, the determination is made based on the reduction rate of the absolute value of the magnetic field strength per unit time. May be.

When it is determined NO in both S630 and S634, the process proceeds to S644.
If the open state is stored (S644 YES), the close detection signal is transmitted (S645) and the closed state is stored in the storage unit 54 (S646). Then, the process proceeds to S610 in FIG.
If the open state is not stored (NO in S644), the process proceeds to S610 in FIG. 7 and monitoring is continued.

As described above, in the third embodiment, when the intensity of the sampled magnetic field exceeds the first threshold value (TH1), it is not immediately determined that there is a plan action. Then, when there is a decrease in the magnetic field strength exceeding the fourth threshold value (TH4) within a predetermined time, it is determined that there is a plan action.
Therefore, it is possible to distinguish between closing by the user and plan action.
If it is determined that the cause of the sampled magnetic field intensity exceeding the first threshold value (TH1) is an additional closing by the user, the reference value is updated. Action can be determined.

In the above-described embodiment, the transmission form to the outside is wireless, but it may be wired.
In the above-described embodiment, the process for obtaining the absolute value is performed. However, when an element such as an MR element that does not determine the polarity is used, this process is not necessary.
In addition, when it is NO in the determination of whether the window of S605 of FIG. 6, S1103 of FIG. 11, and S1205 of FIG. 12 is closed, a signal that the window is not closed from the output unit 55 to the monitoring unit. May be sent to the user and displayed on the display unit of the monitoring unit.
Also, when determining the presence or absence of a plan action in the process of S613 → S614 in FIG. 7, S1211 → S1212 in FIG. 13, S613 → S630 in FIG. 14, and S613 → S634 in FIG. When all of the determinations of the plurality of times are the same, the subsequent processing (S615 or S620 (FIG. 7), S1213 or S1218 (FIG. 13), S631, S635, or S644 (FIG. 14)) is executed. In other cases, the above process may be skipped and the immediately preceding T2 timing process may be returned. In this way, erroneous determination due to noise or the like can be prevented.
Further, the open detection signal and the close detection signal in S616 and S621 in FIG. 7, S1214 and S1219 in FIG. 13, and S632 and S645 in FIG. 14 are respectively used as a signal indicating a plan abnormality and a signal indicating a recovery from the plan abnormality. You may transmit in distinction. By doing so, it is possible to determine abnormality by distinguishing it from normal opening and closing of windows. In this case, in addition to the flag for storing the open / closed state of the window, the storage unit 54 requires a flag for storing the presence / absence state of the plan state.

  As described above, in the present invention, when the planning magnet having a magnetic field intensity exceeding the magnitude that can hold the detection of the switch unit in the closed state even when the window is opened, is positioned near the switch unit, It is determined by the determining means that the window is open. As a result, even if an attempt is made to open the window with the switch portion being insensitive by using the planning magnet, it is possible to detect that the window has been opened. Therefore, even if it is a magnetic detection type sensor installed in a place where the detection unit can be visually recognized from the outside, there is an effect that the plan action can be detected with certainty.

It is a figure explaining the conventional magnetic detection type sensor. It is a figure which shows the installation place of the conventional magnetic detection type sensor. It is a figure which shows the installation condition of the magnetic detection type sensor to the window of a drawing method. It is a figure which shows the conventional magnetic detection type sensor. It is a block diagram of the magnetic detection type sensor which concerns on this invention. It is an operation | movement flow (1) of a magnetic detection type sensor (1st Example). It is an operation | movement flow (2) of a magnetic detection type sensor (1st Example). It is a figure which shows the hysteresis characteristic of a switch part. It is a timing chart which detects the scheme performed after a reference value is memorized. It is a timing chart which detects the scheme performed before a reference value is memorized. It is a memory | storage flow of a reference value (2nd Example). It is a monitoring flow (1) of a magnetic detection type sensor (2nd Example). It is a monitoring flow (2) of a magnetic detection type sensor (2nd Example). It is a part of operation | movement flow of the magnetic detection type sensor in a 3rd Example (3rd Example).

Explanation of symbols

24 Magnet 40 Detection unit 51 Control unit 52 Switch unit 53 Magnetic field measurement unit 54 Storage unit 55 Output unit 56 Timekeeping unit 57 Battery

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 at a position where the movable member is closed;
The detection unit is
A switch unit that detects an open state or a closed state of the movable member under the influence of a magnetic field generated from the magnet;
A magnetic field measurement unit for measuring the strength of the magnetic field;
A control unit that performs a determination process based on outputs from the switch unit and the magnetic field measurement unit;
A storage unit that stores a reference value used for the determination process of the control unit and a determination value based on the strength of the magnetic field more than detecting a change from the closed state to the open state of the switch unit;
An output unit for outputting a determination result of the control unit;
Have
The controller is
Reference setting means for storing, in the storage unit, the strength of the magnetic field measured by the magnetic field measurement unit when the detection of the switch unit is in a closed state, as a reference value;
A determination means for determining the presence of a plan action when the difference between the magnetic field strength obtained from the magnetic field measurement unit and the reference value exceeds the determination value;
A magnetic detection type sensor comprising: 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 at a position where the movable member is closed;
The detection unit is
A switch unit that detects an open state or a closed state of the movable member under the influence of a magnetic field generated from the magnet;
A magnetic field measurement unit for measuring the strength of the magnetic field;
A control unit that performs a determination process based on outputs from the switch unit and the magnetic field measurement unit;
A storage unit that stores a reference value used in the determination process of the control unit and a determination value based on the strength of the magnetic field received by the switch unit from the magnet;
A timekeeping unit that times a predetermined time when the strength of the magnetic field obtained from the magnetic field measurement unit exceeds a value obtained by adding the determination value to the reference value;
An output unit for outputting a determination result of the control unit;
Have
The controller is
Reference setting means for storing the magnetic field strength measured by the magnetic field measurement unit as the reference value in the storage unit when the detection of the switch unit is in a closed state;
Maximum value detecting means for detecting the maximum value of the strength of the magnetic field obtained from the magnetic field measuring unit during timing of the time measuring unit;
When there is a decrease in the magnetic field strength equal to or greater than the determination value from the maximum value of the magnetic field strength obtained from the maximum value detection means during the time counting of the time measuring unit, the determination means for determining the presence of the planning action,
A magnetic detection type sensor comprising:   Further, the reference setting means updates, as the reference value, the strength of the magnetic field obtained from the magnetic field measurement unit when the timing unit is measuring time when the determination unit does not determine the presence of the planning action. The magnetic detection type sensor according to claim 2.   Furthermore, the said determination means determines the presence of plan action, when the strength of the magnetic field obtained from the said magnetic field measurement part is less than the value which subtracted the said judgment value from the said reference value. Magnetic detection type sensor. Furthermore, the storage unit stores a closing strength that is at least stronger than the strength of the magnetic field for detecting a change from the open state to the closed state of the switch unit,
The reference setting means updates the reference value when the strength of the magnetic field obtained from the magnetic field measurement unit exceeds the closing strength when the switch unit changes from an open state to a closed state. The magnetic detection type sensor according to any one of 1 to 4. Furthermore, the magnet and the detection unit are installed on different movable members,
The magnetic detection type sensor according to any one of claims 1 to 5, wherein the output unit of the detection unit transmits a determination result from the determination unit by a radio signal.

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