JPS6111839Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an abnormality monitoring device for fire, theft, etc., which combines a detector and an imaging device such as an ITV (industrial television) camera.

Flood prevention and disaster prevention systems using ITV cameras are
It is widely used as a part of the information society. The problem with detectors used in fire and burglar alarm systems is that they sometimes generate false alarms for some reason, but in the case of ITV cameras, the operator can make judgments visually, so there are fewer erroneous judgments, and the reliability of the system is high. This is because it improves.

However, monitoring using ITV cameras is not sufficient in terms of reliability and economy. For example, if a manager takes his eyes off the receiver, it will be impossible to detect an abnormality, and when monitoring a large area such as a large hall or factory, placing ITV cameras in one or two locations will make it impossible to detect abnormalities. Unable to monitor
Installing a large number of ITV cameras so that every corner can be monitored would require a large amount of money, which would be an economic problem.

The present invention improves on these points by distributing a large number of anomaly detectors in a wide monitoring area, and installing an ITV camera in a place where all of these detectors can be seen, so that when an abnormal situation occurs, The detector alerts the user of the occurrence of an abnormality and its location, and then moves to the location.
ITV camera now faces automatically. In this way, a wide area can be reliably monitored with one or a few cameras, and personnel costs, equipment costs, etc. can be saved. Next, the present invention will be explained in detail with reference to examples.

Figures 1 and 2 show a large number of detectors DET and
This shows the arrangement of the ITV camera TVC. S is a monitoring area, and a large number of detectors DET are arranged in a matrix in this monitoring area, and the camera TVC is installed at one corner in the case of FIG. 1, and in the center in the case of FIG. x _±1 , x _±2 ...x _±n , y _±1 , y _±2
...y _±o indicates the x and y coordinates of each detector. camera
The TVC can be aimed at all detectors or their vicinity at a swing angle of 90° in the case of Figure 1, or at a swing angle of 360° in the case of Figure 2.

3 to 5 show position detection circuits for controlling the aiming position of the camera. In Figure 3, x _j-1 and x _j are x
The (j-1)th and (j)th conductors in the conductor group, y _i-1 and y _i are the (i-1)th and (i)th conductors in the y conductor group, and these are vertical, They are arranged horizontally in a matrix, and each intersection point connects to the ground G.
The contacts of the detector DET are connected through a diode D between them. S _ji indicates the contact point of the detector located at the coordinates (x _j , y _i ). A voltage (+V) is applied to each vertical and horizontal conductor via a resistor R, and therefore, in a normal state when the detector detects no abnormality and opens its contacts, both conductors are at a high level. However, a certain detector detects an abnormality and the contact, for example S _ji
When closed, the conductors x _j and y _i are grounded through the diode D and the contact S _ji and become low level. This allows you to know which detector has issued the alarm, and its coordinate signal output circuit is shown in FIG.

In Figure 4, Rx and Ry are connected between the power supplies +V and -V by a resistive voltage divider with a large number of taps, and field effect transistors Q are connected between these taps and the common output conductors Lx and Ly, respectively. , the gates of these transistors are connected to the corresponding vertical and horizontal conductors l, L via the inverter INV and the cable CBL.
connected to. In this circuit, for example, the coordinates x ₁ , y _-1
When the detector located at generates an alarm and closes its contacts indicated by the dotted circle, the conductors l ₁ and L _-1 become low level, which is inverted by the inverter and the transistors Q ₁ and Q connected to the conductors are inverted. Turn on _-1 . Therefore, these transistors Q ₁ ,
Tap voltages V _1n and V _-1o to which Q _-1 is connected appear. Each tap voltage of voltage divider Rx, Ry...V _2n , V _1
n , V _0n ... and ... V _2o , V _1o , V _0o ... are detectors
Since the values are selected to correspond to the x and y coordinates of DET, the voltage Vx appearing on the output conductors Lx and Ly is =
V _1n , Vy = V _-1o is the alarm detector located at x ₁ , y _-1
The x and y coordinates of DET are shown.

Figure 5 shows the camera's
A circuit is shown to obtain the angle signals necessary to direct the TVC to its alarm detector. This conversion circuit includes a division circuit 1, a tan θ→θ conversion circuit 2, a quadrant detection circuit 3, and a synthesis circuit 4. Since the voltages Vx and Vy indicating the x and y coordinates of the alarm detector can be obtained using the circuit shown in Fig. 4,
Determining the ratio Vy/Vx with the divider circuit 1 indicates tan θ for the alarm detector with the x-axis as a reference. The value of tanθ takes a value from 0 to ∞ when the angle changes within the range of 0° to 90°, and this is repeated in each quadrant. It is therefore necessary to detect the quadrant in which the alarm detector is located, and circuit 3 performs this. The quadrant detection circuit 3 has a logic circuit, and if Vx>0 and Vy>0, it is in the first quadrant.
If Vx<0, Vy<0, the second quadrant is determined, and so on. tanθ which is the output of divider circuit 1
is converted into an angle θ in the conversion circuit 2, and then a correction value spread over the quadrant is added in the synthesis circuit 4. Then, the angle θ between the line connecting the origin and the alarm detector and the positive x-axis, that is, the camera TVC The required rotation angle is obtained. Of course, this quadrant detection circuit is not necessary if the camera TVC is arranged as shown in FIG. 1 and can be rotated through 90 degrees to point all the detectors.

If the conversion from tan θ to θ is carried out strictly, the circuit becomes considerably complicated. Therefore, in reality, it is better to use an approximation circuit, which is shown in Figure 7. In this figure, 6 is a large number of fixed resistors Rx and variable resistors of various values.
A tan ^-1 approximation circuit consisting of VR and diode Da adjusts the value of these fixed resistors and the value of the variable resistor to which voltage Va is applied to calculate input voltage Vi vs. output voltage.
The characteristic of V ₀ is as shown in Figure 8, that is, tan
Try to approximate the relationship between θ and θ. input voltage
Since Vi is the output of divider circuit 1, that is, Vy/Vx,
The output V ₀ of the circuit 6 becomes the desired θ. Note that 7 is an operational amplifier, and the output θ is taken out from this amplifier.

Figure 6 shows an imaging camera using the above circuit.
The TVC control device is shown. In this figure, 11 is a large number of detector groups distributed in the monitoring area, and 20 is a fourth detector group.
A position detector 1 consisting of a matrix circuit 12 shown in the figure and an angle detection circuit 13 shown in FIG.
5 is a servo amplifier for the imaging camera TVC;
16 is the same servo motor, and 17 is a television receiver that receives the output from the camera TVC. Further, 19 is a feedback potentiometer whose sliding arm 19A is driven by the rotating shaft of the camera TVC, and its output voltage is fed back to the servo amplifier 15. S ₁ is an automatic manual switching contact, which is operated by a relay device RY. When there is no alarm from the detector group 11, the output of the inverter 14 becomes “1” and the switching contact is activated. Connect S ₁ to automatic side fixed contact a
Switch from to manual side fixed contact m. Reference numeral 18 denotes a sweep oscillator that generates, for example, a triangular wave, which becomes a command voltage for automatic repetitive swinging. 21 is a manual control potentiometer that generates a desired voltage. _S2 is a switch connected to the oscillator side contact r or the manual control potentiometer side contact t.

Next, to explain the operation of this device, the detector group 1
When any of the detectors in the detector 1 issues an alarm, the position detector 20 detects the position of the detector as described above and outputs the angle θ required to direct the camera TVC toward the detector. Further, the output of the inverter 14 becomes "0", and the relay device RY switches the switching contact _S1 to the fixed contact a. As a result, the servo amplifier 15
A signal to command the angle θ is input to servo motor 1.
6 rotates the camera TVC. The camera rotation angle is detected by the potentiometer 19 and fed back to the servo amplifier 15, and when the two match, that is, when the camera is directed toward the alarm detector, the servo amplifier 1
5 loses its output and the servo motor 16 stops. The above is an operation for automatically pointing the camera toward the alarm detector when the detector issues an alarm, but in addition to this, this circuit also manually rotates the camera to a desired position.
Alternatively, the camera can be automatically oscillated repeatedly. That is, when there is no alarm from the detector group 11, the output of the inverter 14 is "1", and the switching contact _S1 is switched to the fixed contact m. Here, the switch _S2 is switched to the potentiometer side contact t, and the potentiometer 21 is further operated. As a result, the output voltage of the potentiometer 21 is input to the servo amplifier 15, and by manually operating this potentiometer, the camera TVC can be directed in a desired direction. When the switch S ₂ is switched to the oscillator side contact r, the output of the sweep oscillator 18 is input to the servo amplifier 15, and the servo motor 16 and hence the camera TVC repeatedly rotate within a predetermined angular range determined by the amplitude of the output voltage of the oscillator 18. . This is used when projecting the entire surveillance area onto a receiver. Manual operation using the potentiometer 21 does not generate any alarm from the detector group, but is preferably used when it is desired to particularly observe a certain part.

In the case of a fire detector, if the position detection circuit and servo mechanism are disconnected when the first alarm is issued from the detector, the source of the fire can be confirmed.

FIGS. 9 and 10 show modified examples. Figure 9 is a modification of Figure 3, where C is a coil through which a horizontal (y) conductor L and a vertical (x) conductor L pass through, and each conductor is commonly connected to an AC or direct-current power source after passing through the coil. be done. The contact S of the detector DET is connected to the intersection of the vertical and horizontal conductors l and L in the same way as in FIG. 3, or in such a way that the vertical and horizontal conductors are connected at the intersection without a diode. In this device, if a certain detector issues an alarm and, for example, the contact S _ji closes, the conductors lj, Li
A current flows through the coils Cj and Ci, which sense this and generate a voltage.The output voltage of these coils indicates the coordinates (xj, yi) of the alarm detector.

FIG. 10 is a modification of FIG. 6, and the same parts are given the same reference numerals. Reference numeral 25 denotes a servo mechanism, which includes a servo amplifier 15 and a servo motor 16 shown in FIG. 26 and 27 are square circuits,
x and y coordinate voltages of matrix circuit 12, respectively
Vx and Vy are squared to output V ² _x and V ² _y . 28 is an arithmetic circuit that takes the square root of the sum of these voltages, and the output of this circuit therefore indicates the straight-line distance from the camera TVC to the alarm detector. The servo mechanism 29 receives the distance signal, zooms the camera TVC, and focuses the camera TVC on the alarm detector. Also, although not shown, a calculation circuit is provided in this servo mechanism, and from the distance to the alarm detector and the height of the alarm detector (this is known), the floor directly below the alarm detector is By calculating the angle of attack of the camera necessary to aim at the surface and adjusting the angle of attack adjustment mechanism of the camera TVC to take this angle of attack, the camera can observe not only the alarm detector but also the floor directly below it. For example, the firing state can be closely monitored from a distance.

As explained in detail above, according to the present invention, it is possible to accurately and automatically monitor the entire surveillance area by simply installing a detector and a single imaging camera in a place overlooking the detector, and at low cost. A highly reliable alarm system can be provided. In addition, if the alarm is issued by the detector and the power of the camera and receiver is turned on, monitoring can be carried out unattended with low power consumption at all times, and when an abnormality occurs, those who hear the alarm can immediately monitor the Using the image receiver, abnormalities can be observed in detail and appropriate measures can be taken.

[Brief explanation of the drawing]

Figures 1 and 2 are plan views illustrating the arrangement of detectors and cameras in the monitoring area, and Figures 3-
Fig. 5 is a circuit diagram and block diagram showing the configuration of the position detector, Fig. 6 is a block diagram showing an embodiment of the present invention, and Figs. 7 and 8 are circuit diagrams and block diagrams of an approximation circuit for tan ^-1 θ. Characteristic curve diagrams, Figures 9 and 10
The figures are a circuit diagram and a block diagram showing a modification of the present invention. In the drawing, DET is the detector, TVC is the imaging camera,
20 is a position detection circuit, and 25 is a servo mechanism.

Claims (1)

[Scope of utility model registration request] A large number of abnormality detectors such as fire and theft detectors are distributed, and imaging cameras are installed in positions where the detectors or their vicinity can be viewed, and when the detectors are activated, the position of the activated detector can be determined based on the output. a position detection circuit that detects and outputs an angle signal; a servo mechanism that is energized by the output of the angle signal from the position detection circuit and operates to direct the imaging camera toward the motion detector or the vicinity thereof; An abnormality monitoring device comprising: a receiver that receives an output from the camera and displays an image of the detector or its vicinity.