JPH1186153A - Thermal sensor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the life of a stepping motor that scans a warning zone, with respect to a thermal sensor for static detection which can scan a warning zone. SOLUTION: The alarming zone of a static detection sensor 11 is not scanned at all times but is scanned only when it is necessary. For instance, when it is in a warning state and also when only an accident warning audible signal is outputted from a movable detection sensor 10 or a sensor head 12 of the sensor 11, is the scan started. After scan has started, it is stopped when the accident warning audible signal disappears from the sensor 10 or from the head 12 of the sensor 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hot-wire sensor system capable of detecting a stationary object.

[0002]

2. Description of the Related Art The present applicant has previously proposed a stationary detection hot-wire sensor capable of detecting a stationary object. In addition, in this specification, the hot-wire sensor for stillness detection means a hot-wire sensor configured to scan the alert zone by any method. If the alert zone is scanned in this way, the alert zone and the person move relatively even when the person is stationary within the scan range, so that the person can be detected. is there.

[0003] On the other hand, a hot-wire sensor that has a fixed alert zone at all times, such as a conventionally widely used hot-wire sensor, can only detect a moving object, and will be referred to as a moving-object detecting hot-wire sensor. Therefore, when the scanning of the alert zone is stopped, the stationary detection heat ray sensor cannot detect a stationary object, and functions as a moving object detection heat ray sensor.

[0004] In the stationary detection hot-wire sensor, at least the following three forms are used to scan the alert zone.
There are types.

[0005] First, the present applicant has filed Japanese Patent Application No. 7-159314.
As disclosed in Japanese Patent Application Laid-Open No. 9-5156, there is a form in which a pyroelectric element and its optical system are integrally reciprocated or rotated to form a security zone. This mode can be said to drive the entire conventional hot-wire sensor for moving body detection.

Further, there is a form in which the pyroelectric element is fixed, and only the optical system which forms the alert zone together with the pyroelectric element reciprocates or rotates with respect to the pyroelectric element. This is a form proposed by the present applicant in Japanese Patent Application No. 7-178344 (Japanese Patent Application Laid-Open No. 9-33663).

Further, a pyroelectric element for forming a security zone and a lens are fixed, a reflecting mirror for reflecting a heat ray radiated from an object and entering the pyroelectric element is provided, and the reflecting mirror is reciprocated. There is a form of moving or rotating.
That is, the guard zone formed by the pyroelectric element and the lens is scanned by the reflecting mirror. FIG. 4 shows an example of the configuration. 4, reference numeral 1 denotes a housing, 2 denotes a pyroelectric element array, 3 denotes a lens, 4 denotes a circuit board, 5 denotes a reflecting mirror, and 6 denotes a motor.

A housing 1 houses a circuit board 4 on which a pyroelectric element array 2 is mounted. The circuit board 4 can be provided with a circuit for operating the pyroelectric element array 2 or a circuit for processing an output signal from the pyroelectric element array 2.

A lens 3 is provided on a surface of the housing 1 facing the pyroelectric element array 2. The lens 3 is formed of a material that transmits at least heat rays, that is, far infrared rays. The pyroelectric element array 2 and the lens 3 form a vertical and / or horizontal alert zone. The housing 1 is used by being fixed to a predetermined location.

On the other hand, a reflecting mirror 5 formed separately from the housing 1 is arranged at a place separated from the housing 1 by an appropriate distance. The reflecting mirror 5 is reciprocated or rotated by a motor 6 as a driving means as shown by an arrow 7 in the figure. Thus, the alert zone formed by the pyroelectric element array 2 and the lens 3 is scanned by the movement of the reflecting mirror 5. In addition,
A stepping motor may be used as the motor 6.

According to this configuration, the heat rays radiated from the object in the alert zone are reflected by the reflecting mirror 5 and the lens 3
, And is incident on the pyroelectric element array 2, so that an object can be detected. In addition, since the alert zone is scanned by the reflector 5, if there is a stationary object in the alert zone, the alert zone is moved relative to the stationary object. It can also detect stationary objects.

[0012]

However, in the above-described stationary detection heat ray sensor, if the alert zone is constantly scanned, the driving means for scanning the alert zone, usually a stepping motor is used. The service life may be shortened.

SUMMARY OF THE INVENTION The present invention has an object to extend the life of a driving means for scanning a warning zone of a heat detection sensor for detecting stillness.

[0014]

Means for Solving the Problems By the way, an intruder intrudes from an entrance or a window, etc. When the intruder is stationary or almost stationary after the intruder intrudes, the intruder is used for detecting a stillness. It can be said that this is a scene where the power of the heat ray sensor is exhibited. When an intruder usually moves when entering from an entrance or a window, it can be detected by a security sensor such as a hot-wire sensor for detecting moving objects or a magnet switch that detects opening and closing of windows. It is believed that there is. Therefore, if an intruder is detected by a security sensor such as a moving object detection hot-wire sensor or a magnet switch, and the presence of an intruder is detected, the alert zone of the still-detection hot-wire sensor is scanned, It is possible to detect even when it hardly moves, and since the alert zone of the hot-wire sensor for stillness detection is scanned only when necessary, the life of the driving means can be extended.

The outputs of the hot-wire sensor for detecting a moving object and the hot-wire sensor for detecting stillness are input to a security device. In general, the security device can set a warning state and a release state for each security area. It is. Then, when the release state is set in a certain guard area, the security device issues an alert indicating that a moving object has been detected from the moving body detection heat ray sensor or the still detection heat ray sensor installed in the guard area. Since the signal is ignored even if it is received, it is understood that it is not necessary to scan the alert zone of the hot-wire sensor for stillness detection.

Therefore, a hot-wire sensor system according to a first aspect of the present invention is a hot-wire sensor system including a security sensor such as a hot-wire sensor for detecting a moving object and a magnet switch, and a hot-wire sensor for detecting stillness. Is usually fixed, and when an alarm signal is output from the security sensor or the hot-wire sensor for stillness detection, the alert zone of the hot-wire sensor for stillness detection is scanned.

According to a second aspect of the present invention, in the hot-wire sensor system including the hot-wire sensor for stillness detection, the alert zone of the hot-wire sensor for stillness detection is usually fixed, and the alert zone is fixed. When the alert signal is output from the hot-wire sensor for stillness detection in the state, the alert zone of the hot-wire sensor for stillness detection is scanned.

Further, the hot-wire sensor system according to a third aspect of the present invention provides a hot-wire sensor for detecting stillness,
In a hot-wire sensor system including a security device whose release state can be set, when the release state is set by the security device, scanning of the guard zone of the heat ray sensor for stillness detection is not performed. .

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a first embodiment of a heat ray sensor system according to the present invention, and shows an embodiment of a heat ray sensor system suitable for being applied to a guard area where there are several places where there is a possibility of intrusion. FIG. In the drawing, reference numeral 10 denotes a moving body detection hot-wire sensor (hereinafter, referred to as a moving body detection sensor), 11 denotes a stationary-detection hot-wire sensor (hereinafter, referred to as a still detection sensor), 12 denotes a sensor head, 13 denotes a driving unit, and 14 denotes a position. A detection unit, 15 is a drive control unit, 16 is a security device, 17 is a warning button, and 18 is a release button.

The moving body detection sensor 10 is a hot-wire sensor in which a warning zone, which is widely used in the past, is fixed.
When a moving object is detected, an alarm signal is output. The alert zone of the moving object detection sensor 10 is directed to a location where there is a possibility of entry. Since the configuration and operation of the moving object detection sensor 10 are well known, detailed description thereof will be omitted.

The stationary detection sensor 11 is a sensor head 1
2, a drive unit 13 and a position detection unit 14. The sensor head 12 includes at least one pyroelectric element forming an alert zone, its optical system, and a processing circuit for detecting an object based on a signal from the pyroelectric element.
When an object is detected, an alarm signal is output from the sensor head 12. Note that the configuration of the sensor head 12 is the same as that of the moving object detection sensor 10, and a description thereof will be omitted.

The sensor head 12 is driven by driving means 13
And a scan of the alert zone is performed. Thus, a stationary body can be detected. However, when the alert zone is not scanned, a stationary object cannot be detected as in the case of the moving object detection sensor 10 and only a moving object can be detected.

The driving means 13 is for scanning the alert zone of the stillness detection sensor 11, and comprises a stepping motor and its peripheral circuits. Here, it is assumed that the drive output 13 reciprocates in the alert zone of the stillness detection sensor 11 over a predetermined angle range.

The position detector 14 detects the current angle of the stepping motor of the driving means 13 and outputs the detected angle information. Such a position detecting means is widely used when a stepping motor is used, and is well-known, so that the description thereof is omitted.

In FIG. 1, the stationary detection sensor 11 is similar to that shown in Japanese Patent Application No. 7-159314 (Japanese Patent Application Laid-Open No. 9-5156).
344 (Japanese Unexamined Patent Publication No. 9-33663), or of course as shown in FIG.

The drive control section 15 controls the operation of the drive means 13. The operation will be described later. FIG.
Although the drive control unit 15 is disposed independently in the embodiment, the drive control unit 15 may be housed inside the security device 16.

The security device 16 determines whether an abnormality has occurred in the security area based on the alarm signal from the moving object detection sensor 10, the alarm signal from the sensor head 12 of the stillness detection sensor 11, and the security state currently set. It is to determine whether or not. Alert button 1 to set the security status
7. A release button 18 is provided.

If the alert button 17 is pressed while the release state is set, the security device 16 sets the alert state to the alert area. Then, when an alert signal is received from the moving object detection sensor 10 and the sensor head 12 in the alert state, it is determined that an abnormality has occurred in the alert area, and an alert is sent to the security center of the security company via the telephone line. Or ring the bell to intimidate an intruder. Note that the telephone line, security center, bell, and the like are omitted in FIG. 1 because they are not essential matters in the present application.

When the release button 18 is pressed while the alert state is set, the security device 16 sets the release state for the alert area. Then, when in the release state, even if an alarm signal is received from the moving object detection sensor 10 and the sensor head 12, it is ignored, and it is not determined that an abnormality has occurred.

Next, the operation of FIG. 1 will be described. First, it is assumed that the alert zone of the stillness detection sensor 11 is fixed at a predetermined position (this is referred to as an initial position).
If the release button 18 is now pressed, the security device 16 sets the release state for the guard area and notifies the drive control unit 15 that the release state has been set by a control signal. Upon receiving this control signal, the drive control unit 15 does not give any instruction to the drive unit 13. Thus, the alert zone of the stillness detection sensor 11 is kept at the initial position. Therefore, in this case, the stillness detection sensor 11 functions as a heat ray sensor for detecting a moving object. Further, when in the release state, the drive control unit 15 ignores the alarm signal from the moving body detection sensor 10 or the sensor head 12 even if it is received. Further, as described above, when the security device 16 is in the released state, it ignores the alarm signal from the moving object detection sensor 10 or the sensor head 12 as described above.

Thereafter, assuming that the guard button 17 is pressed, the guard device 16 sets the guard state in the guard area and notifies the drive control unit 15 that the guard state has been set by a control signal. The operation of the security device 16 in the alert state is as described above.

Upon receiving a control signal indicating that the alert state has been set from the security device 16, the drive control unit 15 receives an alarm signal from the moving object detection sensor 10 or the sensor head 12.

When the drive control unit 15 receives an alarm signal from the moving object detection sensor 10 or the sensor head 12 in the alert state, it instructs the drive unit 13 to scan the alert zone. As a result, the driving unit 13 drives the sensor head 12, so that the alert zone is scanned.

When the scanning of the alert zone is being performed, the drive control unit 15 fetches the angle information from the position detecting unit 14 to monitor the current alert zone position, and also detects the moving object detection sensor 10 and the sensor head 12. From the moving object detection sensor 10 and the sensor head 12 while the alert zone makes one reciprocation in the predetermined angle range defined as the scan range. When the alert signal is output from the moving body detection sensor 10 and the sensor head 12 while the alert zone makes one reciprocation in the scan range, no instruction is given to the driving unit 13. Therefore, in this case, the scanning of the alert zone is continued.

However, if no alert signal is output from the moving object detection sensor 10 and the sensor head 12 during one reciprocation of the alert zone in the scan range, it can be determined that no intruder has existed. Is driving means 1
3 is instructed to stop scanning. Therefore, when the scan is stopped, the alert zone is at the initial position.

Here, one round trip of scanning of the alert zone will be described as follows. For example, assuming that the scanning range of the alert zone is the range of A and B in FIG. Returning to the position is one round trip of the scanning of the alert zone. Further, assuming that the scan range of the alert zone is the range of A and B in FIG. 2B and the initial position is the position of C, for example, the position goes from the position of C to the position of A, and It is one reciprocation of the scanning of the alert zone that the vehicle passes through the position B to the position B and returns from the position B to the position C again.

As described above, according to this heat ray sensor system, the alert zone of the stillness detection sensor 11 is not constantly scanned, but is turned on when necessary, specifically, in the alert state. Scanning is started only when the alarm signal is output from the sensor head 12 of the moving object detection sensor 10 or the stillness detection sensor 11 at a certain time, and after the scan starts, the sensor of the moving object detection sensor 10 or the stillness detection sensor 11 is started. The operation is stopped when the alarm signal from the head 12 disappears, so that the life of the driving means 13 can be extended.

In the above description, the moving body detection sensor 10
However, other security sensors such as a magnet sensor can be used instead of the moving body detection sensor. For example, when a magnet sensor is used in place of the moving object detection sensor 10 in FIG. 1, when the window is opened by an intruder in the alert state, the alert zone of the stillness detection sensor 11 is scanned. Become.

The first embodiment has been described above. Next, the second embodiment will be described. FIG. 3 is a diagram showing a second embodiment of the heat ray sensor system according to the present invention, and shows an embodiment of the heat ray sensor system suitable for being applied to a caution area where there is only one place where there is a possibility of intrusion. FIG. In the figure, the same components as those shown in FIG. 1 are denoted by the same reference numerals.

When there is only one invading point, there is no need to use the moving object detecting sensor as in the first embodiment described above, and the alert zone of the stationary detecting sensor is usually used for the possibility of the intruding. It is good to point to the place where there is. In the second embodiment, this position is the initial position. For this purpose, only the stillness detection sensor 11 is provided in FIG.

Now, referring to FIG.
Security zone is fixed at the initial position. If the release button 18 is now pressed, the security device 16 sets the release state for the guard area and notifies the drive control unit 15 that the release state has been set by a control signal. Upon receiving this control signal, the drive control unit 15 does not give any instruction to the drive unit 13. Thus, the alert zone of the stillness detection sensor 11 is kept at the initial position. Therefore, in this case, the stillness detection sensor 11 functions as a heat ray sensor for moving body detection. In addition, the drive control unit 15 ignores the alarm signal from the sensor head 12 in the release state. The operation when the security device 16 is in the released state is the same as described above.

Thereafter, assuming that the guard button 17 is pressed, the guard device 16 sets the guard state in the guard area, and notifies the drive control unit 15 that the guard state has been set by the control signal. The operation of the security device 16 in the alert state is as described above.

Upon receiving a control signal indicating that the alert state has been set from the security device 16, the drive control unit 15 accepts an alarm signal from the sensor head 12. Then, upon receiving the alarm signal from the sensor head 12 at this time, the drive control unit 15 instructs the drive unit 13 to scan the alert zone. As a result, the driving unit 13 drives the sensor head 12, so that the alert zone is scanned.

When the scanning of the alert zone is being performed, the drive control unit 15 fetches the angle information from the position detecting unit 14 to monitor the current alert zone position, and also issues an alarm signal from the sensor head 12. Of the sensor head 12 while the alert zone makes one round trip through the scan range.
It is determined whether or not the alarm signal is output from the sensor head 12. When the alarm signal is output from the sensor head 12 while the alert zone makes one reciprocation in the scan range, no instruction is given to the driving unit 13. Not performed. Therefore, in this case, the scanning of the alert zone is continued.

However, if no alert signal is output from the sensor head 12 while the alert zone makes one reciprocation in the scan range, it can be determined that no intruder has existed. To stop scanning. Therefore, when the scan is stopped, the alert zone is at the initial position.

As described above, according to this heat ray sensor system, the alert zone of the stillness detection sensor 11 is not always scanned, but is turned on when necessary, specifically, in the alert state. At a certain time, the scan is started only when the alert signal is output from the sensor head 12 of the stillness detection sensor 11, and after the start of the scan,
When the alarm signal from the sensor head 12 of the stillness detection sensor 11 disappears, the operation is stopped, so that the life of the driving unit 13 can be extended.

Although the embodiments of the present invention have been described above, it is obvious to those skilled in the art that the present invention is not limited to the above embodiments, and that various modifications are possible.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a heat ray sensor system according to the present invention, and shows an embodiment of a heat ray sensor system suitable for being applied to a caution area where there are several places where there is a possibility of intrusion. FIG.

FIG. 2 is a diagram for explaining one reciprocation of scanning of the alert zone of the stillness detection sensor 11;

FIG. 3 is a view showing a second embodiment of the heat ray sensor system according to the present invention, and is an embodiment of the heat ray sensor system suitable for being applied to a guard area where there is only one place where there is a possibility of intrusion. FIG.

FIG. 4 is a diagram showing one mode for scanning an alert zone in the hot-wire sensor for stillness detection.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Case, 2 ... Pyroelectric element array, 3 ... Lens, 4 ... Circuit board, 5 ... Reflector, 6 ... Motor, 10 ... Hot wire sensor for moving body detection (moving body detection sensor), 11 ... Hot wire sensor for stillness detection (Stationary detection sensor), 12: sensor head, 13: drive unit, 14: position detection unit, 15: drive control unit, 16 ...
Security device, 17 ... Alarm button, 18 ... Release button.

Claims (3)

[Claims] 1. A hot-wire sensor system including a security sensor such as a moving-body detection hot-wire sensor and a magnet switch, and a stationary-detection hot-wire sensor, wherein the alert zone of the stationary-detection hot-wire sensor is usually fixed. Alternatively, when the alert signal is output from the hot-wire sensor for stillness detection, the alert zone of the hot-wire sensor for stillness detection is scanned. 2. A hot-wire sensor system provided with a hot-wire sensor for stationary detection, wherein the alert zone of the hot-wire sensor for stationary detection is usually fixed, and an alarm is issued from the hot-wire sensor for static detection in a state where the alert zone is fixed. A hot-wire sensor system characterized in that when a signal is output, the alert zone of the hot-wire sensor for stillness detection is scanned. 3. A hot-wire sensor system comprising a hot-wire sensor for detecting stillness and a guard device capable of setting a guard state / clear state of a guard area. A hot-wire sensor system, wherein a scanning of the alert zone of the detection hot-wire sensor is not performed.