JP2504675Y2 - Security detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a security sensor.

[Conventional technology]

Conventionally, this type of sensor is equipped with a reflection mirror for collecting infrared rays and a pyroelectric element for receiving the infrared rays collected by the reflection mirror, and is installed on the ceiling or the like to be protected and radiated from the human body. It is known that the reflected infrared rays are condensed on a pyroelectric element by a reflecting mirror and an alarm signal is output according to a change in the received light level of the infrared rays received by the pyroelectric element. Normally, this security sensor is positioned horizontally and vertically so that it can reliably detect a person in the sensing area during security when it is installed on the ceiling of the security target. Install a detector while adjusting whether the intruder can be detected after setting the detection area).

[Problems to be solved by the device]

Conventional security sensors are exposed to the outside of the installation surface when installed, and their orientation can easily change when external force is applied. During the day when the security sensor is not working, etc.), the security target is disguised as a visitor to the security target.) When the sensing area is artificially changed by operating the reflector or the sensor itself, , The location (direction) of the sensor may be temporarily moved (changed) to change the internal layout of the security target, but if the sensor has not been restored to its original state or readjusted after the layout work is completed, or handling If the reflector is rotated due to the carelessness of the sensor and the sensing area has changed, the sensor cannot sense the object within the set sensing area, and the sensor itself is set to the guarded state. Detect intruders even if When the sensor itself is operating normally, even if there is a deviation (change) between the set original sensing area and the actual sensing area, the security service provider visits for periodic inspection. There was a problem that I did not notice the deviation until.

Therefore, an object of the present invention is to provide a security sensor that can automatically detect that the sensing area of a sensor, which has been set once, is illegally changed.

Another object of the present invention is to promptly notify that a deviation (change) has occurred by issuing a detection area abnormality signal when a deviation (change) has occurred between the set sensing area and the actual sensing area. It is to provide a security sensor to notify.

[Means for solving the problem]

According to the present invention, a sensor body, a movable mounting plate for mounting the sensor body on an installation surface, a pair of arms hanging from the sensor body, and a pair of arms rotatably supported between the arms to collect infrared rays. A reflecting mirror and a pyroelectric element that receives infrared rays collected by the reflecting mirror. The infrared rays emitted from the human body are collected by the reflecting mirror on the pyroelectric element, and the pyroelectric element receives the infrared rays. In a security sensor that outputs an alarm signal according to a change in the received light level of infrared rays, a horizontal contact group provided between the movable mounting plate and the installation surface, and a vertical contact provided between the arm and the reflecting mirror. When the group, the movable mounting plate, and the reflecting mirror are moved, the number of times the horizontal contact group and the vertical contact group are turned on and off within a predetermined time is measured, and is it turned on or off a predetermined number of times or more? If it has been turned on and off a predetermined number of times after judging whether or not Abnormality that outputs a sensing area abnormality signal to the security device side when the determination signal output unit that outputs a constant signal and the security start signal output from the alarm device are input and the determination signal output from the determination signal output unit is input A security sensor comprising signal output means and reset means for resetting the signal output of the determination signal output means.

[Action]

When the sensor body is moved horizontally, the horizontal contact group provided between the movable mounting plate and the installation surface repeats ON and OFF intermittently. Also, when the reflector moves around the short axis, the vertical contact group provided between the arm and the reflector also intermittently turns O
Repeat N and OFF. Horizontal contact group, vertical contact group ON, OFF
The judgment signal output means counts the number of times of occurrence, and when the number of times exceeds a predetermined number (for example, three times per second) within a predetermined time,
The determination signal output means outputs the determination signal to the abnormality signal output means until the reset means is operated. When the security device is switched to the security state by the security switching operator, the security device outputs a security start signal, and the security start signal is input to the abnormal signal output means via the signal transmission / reception means. When the determination signal is output from the determination signal output means and the determination signal is input to the abnormality signal output means, the abnormality signal output means outputs the sensing area abnormality signal to the alarm device side. Since the remote alarm monitoring center (not shown) is connected to the alarm device, it can know that the sensing area of the sensor has been changed, and the security officer can be rushed to the guarded area to detect the area. Correct the gap.

〔Example〕

 Examples will be described with reference to the drawings.

1 to 4, a security sensor 1 includes a sensor body 2, a movable mounting plate 3 for mounting the sensor body 2 on an installation surface (ceiling, etc.) 30 to be guarded, and the sensor body 2 A pair of left and right hanging arms 4, 4 and a reflecting mirror 5 rotatably pivoted between the arms 4, 4 for reflecting and condensing infrared rays.
And a pyroelectric element 6 for receiving the infrared rays condensed by the reflecting mirror 5. Thus, the infrared ray radiated from the human body is focused on the pyroelectric element 6 by the reflecting mirror 5, and an alarm signal can be output according to the change in the received light level of the infrared ray detected by the pyroelectric element 6. . A horizontal contact group 11 is provided between the movable mounting plate 3 and the installation surface 30, and a vertical contact group 15 is provided between the arms 4, 4 and the reflecting mirror 5. The sensor main body 2 is provided with each means for processing the signal from the pyroelectric element 6, and further includes a judgment signal output means 21, a caution signal output means 22, and the judgment signal output means 21 described later. The reset means 24 for resetting the signal output is provided.

Of these, the movable mounting plate 3 is formed with four screw holes 3a, 3b, 3c, 3d of the same shape that are circumferentially spaced at equal intervals, and the movable mounting plate 3 is movable (rotatable). By doing so, the sensing area of the sensor 1 is changed in the horizontal direction by directing the sensor body 2 to an arbitrary position in the horizontal direction.

The reflecting mirror 5 is formed with a predetermined space for reflecting infrared rays from the sensing area.
Bearing shafts 9 and 9 (one of which is not shown) pivotally supported by the short shafts 8 and 8 provided in the. Thus, the reflecting mirror 5 has the short axis 8,
Movable in the direction orthogonal to the axis direction of 8, that is, in the vertical direction,
The sensing area of the sensor 1 is changed to an arbitrary position in the vertical direction.

The horizontal contact group 11 includes a pair of movable contacts (electrodes) 12a and 12b provided on the top surface of the movable mounting plate 3 and the movable contact 12
The movable mounting plate 3 is composed of a _first conductive piece group 13 ₁ , 13 ₂ , 13 ₃ , ..., 13 ₁₄ radially arranged on the installation surface 30 so as to face a and 12 b. In the case, the movable contact 12a,
12b and the first conductive piece group 13 ₁ , 13 ₂ , 13 ₃ , ..., 13 ₁₄
And the movable contacts 12a and 12b are turned on (energized) and turned off (interrupted) several times. On the other hand, the vertical contact group 15 includes a pair of upper and lower fixed contacts (electrodes) 16a and 16b provided in the vicinity of the short axes 8 and 8 of the arms 4 and 4, and the reflecting mirror facing the fixed contacts 16a and 16b. 5, a second conductive piece group 17 ₁ , 17 ₂ , 17 ₃ , ..., 17 ₂₀ radially arranged in the vicinity of the bearing hole 9 and fixed when the reflecting mirror 5 is moved. The contacts 16a, 16b and the second conductive piece group 17 ₁ , 17 ₂ , 17 ₃ , ...
The fixed contact 16a 17 ₂₀ is apart contact, 16b is several times the ON (energized), to form the OFF (blocking) state.

The determination signal output means 21 measures the number of times the horizontal contact group 11 and the vertical contact group 15 are turned on and off within a predetermined time when the movable mounting plate 3 and the reflecting mirror 5 are moved,
It is judged whether or not it is ON / OFF a predetermined number of times or more, and if it is ON / OFF a predetermined number of times or more, a judgment signal is output.

Further, the abnormality signal output means 22 outputs a sensing area abnormality signal when the security start signal output from the alarm device is input via the signal transmission / reception means 23 and the determination signal from the determination signal output means 21 is input, This abnormal sensing area signal is transmitted to the alarm device via the signal transmitting / receiving means 23.

The reset means 24 mainly includes the determination signal output means 21.
Is for resetting when the determination signal is output, and the reset switch forming the reset means 24 can cancel the state in which the sensing area abnormality signal is issued. In other words, the reset means 24 is for the security service provider to correct the sensing area and return to the original state in which the sensing area abnormality signal is not output after the work is completed. The reset switch is a non-lock switch and should be installed only in a place where it can be understood by a security service provider so that it cannot be operated without a dedicated tool. Of course, the reset means 24 can also be used during maintenance and inspection.

Reference numeral 7 is a cover for protecting the sensor body 2.

In the above embodiments, an example of a sensor that receives infrared rays emitted from a human body and outputs an alarm based on a change in the amount of received light has been described, but the sensor has a movable part or the sensor itself is movable. It goes without saying that the present invention can be diverted as long as it does.

[Effect of device]

 The present invention is constructed as described above and has the following effects.

When the sensor itself or the reflector is moved and the sensing area of the sensor is illegally changed, at least one of the horizontal contact group and the vertical contact group repeats the ON / OFF state and issues a sensing area abnormality signal. Therefore, the abnormality in the sensing area can be detected promptly. Therefore, it is possible to avoid a situation in which the security service provider cannot be aware of the change in the sensing area until he / she enters the security target for inspection or the like.

[Brief description of drawings]

1A is a schematic side view of a security sensor, FIG. 1B is a schematic front view thereof, and FIG. 2A is a schematic view showing a group of horizontal contacts constituting the security sensor, FIG. 2B and FIG. FIG. 2C is a front view showing a contacting / separating state of the horizontal contact group, FIG. 3A is a structural view showing a vertical contact group constituting the security sensor, FIG. 3B, and FIG.
FIG. C is a front view showing the contact / separation state of the vertical contact group, and FIG. 4 is a block diagram showing the configuration of the security sensor. 1 ... Sensor, 2 Sensor main body 3 ... Movable mounting plate, 4 ... Arm 5 ... Reflector, 6 ... Pyroelectric element 11 ... Horizontal contact group, 15 ... Vertical contact group 21 ... Judgment Signal output means 22 …… Abnormal signal output means 24 …… Reset means

Claims (2)

(57) [Scope of utility model registration request] 1. A sensor body, a movable mounting plate for mounting the sensor body on an installation surface, a pair of arms depending from the sensor body, and an infrared ray movably supported between the arms to collect infrared rays. And a pyroelectric element that receives infrared rays collected by the reflecting mirror. The infrared rays emitted from the human body are collected by the reflecting mirror on the pyroelectric element, and the pyroelectric element receives the infrared rays. In a security sensor for outputting an alarm signal according to a change in the received light level of infrared rays, a horizontal contact group provided between the movable mounting plate and the installation surface, and a vertical contact provided between the arm and the reflecting mirror. When the group, the movable mounting plate, and the reflecting mirror are moved, the number of times the horizontal contact group and the vertical contact group are turned on and off within a predetermined time is measured, and is it turned on or off a predetermined number of times or more? If it has been turned on and off a specified number of times after judging If the judgment signal output means for outputting the judgment signal and the security start signal output from the alarm device are input and the judgment signal output from the judgment signal output means is input, a sensing area abnormality signal is sent to the security device side. A security detector comprising: an abnormal signal output means for outputting; and a reset means for resetting the signal output of the determination signal output means. 2. The horizontal contact group includes a pair of movable contacts provided on the top surface of the movable mounting plate and a first conductive piece group radially arranged on the installation surface. When the movable contact is moved, the movable contact and the first conductive piece group come into contact with and separate from each other to form the ON / OFF state of the movable contact, and the vertical contact group is provided in the vicinity of the short axis of the arm. It is composed of a pair of fixed contacts and a second conductive piece group radially arranged in the vicinity of the bearing hole of the reflecting mirror, and when the reflecting mirror is moved, the fixed contact and the second conductive piece group. The security sensor according to claim 1, wherein the fixed contact is turned on and off to form an ON / OFF state.