JPS62288996A - Optical type alerting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention detects abnormalities when light such as infrared rays emitted from a light transmitter is blocked by an intruder. This invention relates to a light beam warning device that detects light with a light receiver and issues an alarm.

[Prior Art] Conventionally known optical beam warning devices use a light receiver to detect an abnormality when light such as infrared light emitted from a light transmitter is blocked by an intruder, and issue an alarm. I'm doing it like that.

[Problem that the invention attempts to solve] However, the conventional alarm devices mentioned above are used for birds and dogs.

Even when animals such as cats or leaves of trees blocked the light, the alarm was issued, and each time a security guard had to rush to the area where the alarm was issued, it took a lot of effort for the 2G security personnel.

Beneathing margin [Means for solving the problem] The present invention makes it possible to identify what the above-mentioned blocking object is, and to judge in advance whether or not it is necessary to rush to the area where the light is blocked. This is to reduce the labor of security guards.

That is, 1 the present invention provides a light transmitter housing n light transmitting units from the first to the nth and a light receiver housing the n light receiving units from the first to the nth in a restricted area. In a light beam warning device in which the light transmitting parts are installed opposite to each other and each light transmitting part is coupled with the corresponding light receiving part by a single light beam, the light transmitting parts from the first light transmitting part to the nth light transmitting part are connected at regular intervals. a light transmitting section drive control means that sequentially drives the light transmitting section at predetermined time intervals, and a pulse train signal in which the n light receiving outputs are temporally arranged by adding the light receiving outputs of the n light receiving sections from the first to the nth. and the means to obtain it.

Detects a portion where a pulse does not exist in the cis-column signal over multiple periods, detects the time or turn of the portion where the pulse does not exist, and issues an alarm signal when the temporal pattern becomes a predetermined pattern. This is a light beam type warning device having a signal processing means for generating a signal.

Further, each pulse train signal is converted into a video signal for each scanning line of a cathode ray tube display device, so that the above-mentioned temporal pattern is displayed on the cathode ray tube display device. In this way, it is possible to visually recognize the shadow of an object that blocks multiple light rays.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

[Example] Fig. 4 is an overall layout diagram, in which light transmitters and receivers 1, 2, and 3 are composed of a light transmitter and a light receiver that receives light from an adjacent light transmitter.
．． 4 are installed in multiple locations at important points in the restricted area. Each of the transmitter/receivers 1, 2, 3, 4 is connected to the guard post 9 where the security guard is located via signal lines 5, 6, 7.8, and when the light is cut off, the abnormality is detected by the security guard. It can be detected at location 9.

The relationship between the light transmitter and the corresponding light receiver of each light transmitter/receiver is shown in FIG. That is.

The light transmitter 19 generally includes n light emitting diodes (L
ED) 21-1, 21-2. -= , 21-n
'ik has it.

The photodetector 22 has n photodiodes (PDs) as photodetectors.
23-1, 23'-2, -, 23-n, and the optical axes of the light receiving parts corresponding to each light transmitting part are aligned. In addition.

Although n is selected from about 10 to 100, it is not limited to this and is determined depending on the warning conditions.

A drive circuit for the light receiver 22 facing each light transmitter 19 will be explained with reference to FIG.

The output signal of the oscillation circuit 10 provided in the guard post is divided into two signals, one of which is applied to two inputs of an AND circuit 12 via a pulse control circuit 11 and the other.

The output of the AND circuit 12 is sent to the first timer 13. on the light transmitter 19 side. First counter 14. a first divider 15;
It is connected to the second timer 16 and counter 17 on the light receiver 22 side. The first counter 14 is connected to the first timer 13 and the first divider 15. Similarly, the second counter 17 is connected to the second timer 16 and to the second divider 18. first divider 1
The divided terminals of 5 are connected to the LED i of each light transmitting part of the light transmitter 19.
' It is connected to the LED 21 via the line 20. The PD 23 of the light receiver 22 receives the light from the LED 21 and converts it into an electrical signal, and is connected to the AC antenna 24. The plurality of analog switches 25 are connected to individual AC switches 24.
The terminals are connected to the respective divided terminals of the second divider 18, and are connected to the divided terminals of the second divider 18 in sequence. Furthermore, the individual analog switches 25 are connected to each other in the same order as they were connected to the divided terminals of the second divider 18,
The last analog switch 25-n is connected to the waveform shaping circuit 26. The output of the waveform shaping circuit 26 is then transmitted to the signal input section 27. Light shielding detection circuit 28. Arithmetic circuit 29. The image is sent to the CRT 31 via the video RAM 30, and the state of light transmitted from the light transmitter 19 of the light receiver 22 is displayed as an image.

In the above circuit, the Noculus oscillation circuit 10 oscillates the Noculus a shown in FIG. 2 and is applied to the AND circuit 12 and the Noculus control circuit 11. Norse control circuit 11
The output has a pulse waveform in which high level and low level states continue for a long time as shown in b. The output of the AND circuit 12 is of the waveforms a and b.Only when the waveform is in an irregular state, the high output becomes the waveform state of c. That is, the waveform a is output only when the waveform b is at a high level. timer 1
3, a short waveform is outputted at a constant cycle at a predetermined time when the waveform C is at a low level, and is applied to the first counter 14 as a reset pulse. l to the first divider 15
d the output of the first counter 14;

The output of the AND circuit 12 is applied, and the first pulse shown in e of the waveform of C is applied to the first LED drive 20-1.
The second pulse is sent to the second LED drive 20-2,
The nth pulse shown in f is the nth LED drive 20.
-n is sequentially applied, and a pulse of light is emitted from each LED 21 corresponding to each drive 20 in accordance with each pulse. That is, the space between the light transmitter 19 and the light receiver 22 is
Perform the second scan. Among the waveforms of C, n from the first
After each LED 21 sequentially emits light in response to the pulses up to the 1st pulse (after the first scan is completed), the first counter 14 is reset in response to the timer 13. . Therefore, the first AND circuit 12
The waveform of C input from
The signals are sequentially applied to the FD drive 20.

Perform a second scan. This scanning operation is repeated thereafter. In addition, the scanning speed is several 100 to several 10
00 times/sec and input A? to each LED drive.
The pulse width is selected to be 1 to several microseconds.

On the other hand, the other output from the AND circuit 12 is applied to a second timer 16 and a second counter 17. Further, the output of the second timer 16 is applied to the second counter 17 . The output of the second counter 17 is applied to the second de/jer 18.

The output of the second divider 18 corresponds to the first pulse of the waveform of C. The waveform shown in g corresponds to the first analog switch 25-1. The pulse corresponding to the second pulse corresponds to the second analog switch. , n-th pulses are sequentially applied to the n-th analog switch 25-n. or,
After receiving the light emitted from the i LED 21 at each analog switch 25 by the -7zPD2'3, the AC anzo 24
The amplified outputs are sequentially applied9).

Now, when there is no intruder between the light transmitter 19 and the light receiver 22, the pulse applied to the analog switch 25 from the second divider 18 and the pulse applied from the AC amplifier 24 match, so the analog Switch 25 is turned on in response to the pulse. Therefore, each analog switch 25 is sequentially turned on according to the output of the second divider 18 and the output of the AC amplifier 24, and the state is applied to the waveform shaping circuit 26, which sequentially shows the state shown in FIG. A pulse train signal having a waveform indicated by i is output.

The pulse train signal of i is sent to the signal input section 27. Light shielding detection circuit 28
．． Arithmetic circuit 29. Via video RAM 30.

On the screen of the CRT 31, a single Norms waveform appears as a single white dot, which then appears as a continuous white line. The pulses from the first iZ pulse to the nth pulse in the waveform of C are the pulses of each LED.
21 (after the first scan), the second
The pulse from the 1st pulse to the nth 1st pulse is
The waveform shaping circuit 2.6 is sent to the ED 21 as described above.
The waveform shown in 1 is output. Therefore, a second white line appears on the CRT 31 screen.

Then, when a predetermined number of m lines appear as white lines, one screen is formed.

In this way, when there is no similar intruder between the light transmitter 19 and the light receiver 22, no image is projected.

The screen of the CRT 31 is always white.

However, when an intruder passes between the light transmitter 19 and the light receiver 22 and the light is temporarily blocked, the pulse signal from the LED 21 no longer enters the PD 23 corresponding to the blocked light. , the analog switch 25 becomes inoperable. Therefore, the waveform shaping circuit 26 outputs a pulse signal having a shape in which the waveform of the interrupted portion is missing.

That is, when the light from the first, for example, second LED 21-2 is cut off, no light enters the corresponding second PD 23-2, and the analog switch 25-2 does not operate.

Therefore, as shown in j, a pulse signal lacking the second waveform is output from the waveform shaping circuit 26. Such a waveform is detected by the light shielding detection circuit 28 of the subsequent circuit, and the missing portion of the waveform appears as a black dot on the screen of the CRT 31. Therefore, the middle of one white line becomes black and appears chipped.

Generally, when a person intrudes, multiple lights are blocked at once, so a pulse train signal with some pulse waveforms missing from the 1st pulse waveform to the nth pulse waveform is waveform-shaped. It is output from the circuit 26. And the first
After the first pulse signal is output, a second 9-pulse train signal, which similarly lacks some pulse waveforms, is output. Similarly, pulse train signals with missing pulse waveforms are sequentially output.

As described above, these pulse train signals cause a predetermined number of white lines with black parts to appear on the screen of the CRT 31, and the black parts are continuous to form one image pattern.

Thus by monitoring one image pattern.

Was it humans or animals that blocked the light?

Or it can be determined whether it is a tree or a leaf.

Also, even if one image is not monitored, within one line.

The length and height of the black part) and the number of white lines that the black part extends over are multiplied by the number of light shielding parts and the scanning circuit in the calculation circuit 29. It can be calculated as the area seen from , and a warning may be issued automatically based on the value.

Furthermore, when the light shielding object moves slowly between the light transmitter 19 and the light receiver 20, it stops moving.

Since the light of the same IJD 21 is blocked for a long time, a pulse signal lacking the i4 pulse waveform corresponding to that LED 21 is output from the waveform shaping circuit 26 for each scan.
The CRT screen 31 may have a black band-like image with a certain width, and the image may not be distinguishable.

In that case, the output signal may be extracted by skipping several scans at a time.

[Effects of the Invention] As described above, the present invention sequentially sends out Noculus from a plurality of light transmitting sections of a light transmitter at different times and repeats the scans. A light beam warning system that detects the pulse of light and calculates the temporal A' turn of the light that appears in the image or is blocked, thereby making it possible to determine whether the intruder is a human or an animal. device, regardless of the type of intruder as before.

This eliminates unnecessary security where security guards rush to the area every time a blockage is detected, making it possible to provide complete security.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a block diagram. Figure 2 is a waveform diagram for each circuit in Figure 1, and Figure 3 is a waveform diagram for each circuit in Figure 1.
4 is a plan view of the overall arrangement, and FIG. 5 is a side view of the space between the light transmitting and receiving devices shown in FIG. 4. In the figure, 1 to 4 are light transmitters and receivers, 10 is a pulse oscillation circuit, 1
1 is a mother pulse control circuit, and 12 is an AND circuit. 13 is a first timer, 15 is a first divider, 16 is a second timer, 18 is a second divider, 19 is a light transmitter,
21 is an LED (light transmitting section), and 22 is a light receiving section. 25 is an analog switch, and 26 is a waveform shaping circuit. 28 is a light shielding detection circuit, and 31 is a CRT. ””

Claims (1)

[Scope of Claims] 1. A light transmitter housing n light transmitting units from the first to the nth and a light receiver housing the n light receiving units from the first to the nth. In a light beam warning device, which is installed facing each other across the area, and each light transmitting part is coupled with its corresponding light receiving part by a single light beam, the first light transmitting part to the nth light transmitting part are transmitted at regular intervals.
A light transmitting unit drive control means that sequentially drives the light transmitting units up to the nth light transmitting unit at predetermined time intervals, and the light receiving outputs of the n light receiving units from the first to the nth light receiving units are added, and the n light receiving outputs are calculated in a temporal manner. means for obtaining a pulse train signal arranged in a row, and detecting a portion where no pulse exists in the pulse train signal over a plurality of periods to detect a temporal pattern of the portion where no pulse exists, and wherein the temporal pattern becomes a predetermined pattern. and a signal processing means that generates an alarm signal when an alarm occurs. 2. A light transmitter containing n light transmitting parts from the first to nth and a light receiver containing n light receiving parts from the first to nth are installed facing each other across a guarded area. In a light beam warning device in which each light transmitting section is coupled with a corresponding light receiving section by one light beam, the first to nth light transmitting sections are connected at regular intervals.
A light transmitting unit drive control means that sequentially drives the light transmitting units up to the nth light transmitting unit at predetermined time intervals, and the light receiving outputs of the n light receiving units from the first to the nth light receiving units are added, and the n light receiving outputs are calculated in a temporal manner. means for obtaining a pulse train signal arranged in a row, and detecting a portion where no pulse exists in the pulse train signal over a plurality of periods to detect a temporal pattern of the portion where no pulse exists, and wherein the temporal pattern becomes a predetermined pattern. a cathode ray display device; and means for converting the one pulse train signal into a video signal on one scanning line of the cathode ray display device; A light beam warning device, characterized in that the above-mentioned pattern is displayed on the display.