JPS6184586A - Infrared alarm - Google Patents

Abstract

PURPOSE:To reduce the necessary electric power at each relay station by forming only one of infrared beams with pulse light having wide time width and forming other infrared beams with the pulse light having narrow time width. CONSTITUTION:The pulse light with narrow time width is emitted from a projec tor 2. This pulse light is made incident on a photodetector 4. The pulse light with the time width is emitted from a projector 3. This pulse light transmits a signal indicating the position where the abnormality had occurred and the contents thereof. This pulse light is made incident on a photodetector 5. A logical circuit 6 controls the pulse light emitted from the projector 3 correspond ing to the outputs of the photodetectors 4, 5.

Description

[Detailed Description of the Invention] For example, an infrared beam projector and receiver may be installed on the boundary line with the road on the site of a building, etc., so that a warning will be issued when the beam is blocked by an illegal trespasser. There is an infrared warning device.

In such a device, it is necessary to project a plurality of KFi beams vertically in parallel to prevent an intruder from straddling the beam or sneaking under it. In addition, if the warning range is wide or the warning gland is bent, a relay station must be installed along the way. Furthermore, in that case,
If the power source for each relay station and first-stage floodlight is composed of a thick pond and a storage battery charged by its output! ! Since it does not require power wiring, installation is extremely easy.In addition, in order to know the location of the intrusion, K transmits an address signal indicating the relay station from a relay station equipped with a receiver for the blocked beam using an infrared beam. ◎Therefore, in the past, multiple beams were sent to
Rlliff so that A can transmit address signals.
It was formed using wide pulsed light. For this reason, the power required for the relay station and the like increases, requiring a large capacity power source, and there is a drawback that it is not possible to easily configure the solar cell power supply unit 1 as described above. Therefore, the present invention provides an apparatus which operates with a small power supply and can completely prevent undercutting by projecting J beams in parallel.

As described in the claims, the present invention forms only one of the plurality of infrared beams emitted from each relay station, etc. with pulsed light with a wide time width, and the other infrared beams are formed with pulsed light with a wide time width. By using a narrow pulse of light, the required energy is reduced, and the signal indicating the location of one beam being blocked or the location of a failure in the equipment is transmitted using only wide pulses. A logic circuit is provided at a location so that when pulsed light with a small time width is blocked by VfI, the transmission signal using a wide pulse is controlled via the logic circuit. Therefore, the power required at each relay station is reduced by VL('), and this can be easily provided by solar cells and storage batteries.The present invention will now be described in detail with reference to the drawings.

No. 1N consists of hollow cylindrical supports 1++11...- arranged in a line at an appropriate distance on the cordon, and the first stage support 11 has two infrared projectors 2, 3 facing the same direction. Two emitters 2, 3 and two receivers 4 are mounted on the intermediate support 1r-19i at appropriate intervals vertically.
. Also, in Figure 2, the cordon forms a ring with φ
In this case, only intermediate supports 1 to 1.1 are arranged. FIG. 3 shows the arrangement of the electric circuits of the m-coupled optical device and the optical receiver, etc. The output signal of the optical receiver 4.5 is applied to the logic circuit 6, and the output signal is transmitted to the emitters 52, 3. In addition to this, although not shown in the drawings, these devices operate using a large battery provided on each support and a storage battery that is charged by the output of the battery. As shown in FIG. 1, the infrared beam emitted from the projector of each support enters the opposing light receiver 21 of the adjacent support, and in the apparatus of FIG. 1, the last support 1. (Logic circuit 6 in
In addition, in the apparatus shown in FIG. 2, the pulsed light output from the logic circuit 6 of 13 is emitted at a period of, for example, 25 milliseconds.
And the pulsed light is K as shown in the enlarged view in Fig. 5.11.
For example, it is modulated at a frequency of 20' KHy (see Figure 4) Also, the waveform of the external beam is emitted by the wall light projector 3, and the infrared pulsed light with a time width j of, for example, 2.4 milliseconds is emitted by the light projector 2. Similarly, this pulsed light is emitted with a period T of 25 milliseconds and a phase slightly delayed from that of the pulsed light α.As shown in the enlarged view of FIG. 5b, this pulsed light is a binary signal I1. dl-...,...,n, and when each part is modulated by, for example, 30 K11y, the signal [O
J, 50 KH2- is used to indicate a 1 signal "1" when modulated by 0.Furthermore, the first 2 bits a and d of the above 12 bit signals are used as activation signals, and the next 6 bits a,
f...j as support 1. - An address signal indicating each of the IR parameters. Therefore, in this case,
That is, it is possible to provide a maximum of 64 supports and transmit signals indicating any of them. Also, the 4 bits in the tail! , among the hat ducks, the photoreceiver 4 of the kf masono stage
When the pulsed light α is incident on the stage, it is sent out as “NO”, and when the pulsed light α is blocked by an intruder etc., it is sent out as 1. Next, the signal l is sent out as 1. When the support display signal 6°8...j is confirmed by the pulsed light incident on the light receiver 5, ζ几 is set to 0, and when the pulsed light is blocked by an intruder, it is set to 28'. The signal layer is "o" when the power state of that stage is normal, J
% when the received signal level is normal, the signal n is set to 0, and when the received signal level is below a predetermined level, it is set to 7a11'. In other words, the signals 1A and 1n are display signals of the operating state. In the above-mentioned device, when there is no abnormality, the light receivers 4 and 5 of each support receive signals sent from the previous emitter 2 or 3, respectively. The logic circuit 6 that receives the pulsed light signals a and h controls the projector 3 in accordance with the output thereof.In this case, the content of the pulsed light signal S to be sent out is set as described above. The pit support display signal -, /-09,j is the signal α
, 6 can be received together, or if there is an abnormality in the operating status display signal kllllWL- in the received signal hK, the signal 6 sent from the 111th stage is sent from the projector 3 without being changed. However, in cases other than the above, the display number i of the support itself, that is, the address signal unique to each support, is sent out from the projector 3 as a 6-bit signal -1, /, . . . .

Therefore, when the device is operating normally, the address signal indicating the first stage support is always detected by the logic circuit in the last stage support, and the detection signal is applied to the alarm 7. remains inactive. Also, if an infrared beam is interrupted between arbitrary supports by an intruder, etc., or if only one of the two beams is interrupted, or if both of them are interrupted, etc., depending on preset conditions. Then, a signal indicating the support at the subsequent stage of the interception IGi section can be detected by the logic circuit at the final stage. In addition, if this phenomenon is caused by a voltage drop in the telemeter device installed on the support, etc., this will be indicated by the four signal cranes, so it is possible to send out a return message in response to each case, and also to In order to prevent the occurrence of a 0 error in which the location where the error occurred is known, the pulse indicating the abnormality is returned a predetermined number of times in succession as described above. Of course, an alarm should be issued only when :@ occurs.

As described above in the embodiment Kz-, the present invention uses only one pulsed light beam that transmits a signal indicating the location, content, etc. where an abnormality has occurred, and transmits no other signal other than this beam.
In addition to providing one or more infrared beams, a logic circuit is provided on the support of the projector and light receiver 5@, and the content of the signal is controlled according to the state of these beams. Therefore, by making the pulse of the infrared beam that does not carry a signal extremely narrow, the required power of the projector can be made extremely small, and the viewing source of each support can be made compact using a solar cell and a storage battery.

[Brief explanation of drawings]

Figures 1 and 2 show the configuration of an embodiment of the present invention, respectively, and Figure 3 shows the configuration of an 8-digit peep circuit on each support. Figure 41- is a diagram showing the pulse waveform of the infrared beam shown in Figures 1 and 2, and an enlarged diagram of the pulse waveform of Figure 5 fm Tri @ 4. O-de 11+11211. - is a support 4f, 2 and 3 are light emitters, 4 and 5 are light receivers, 6 is a logic circuit, and 7 is an alarm. Leaf umbrella 1]

Claims (1)

[Claims] A plurality of infrared emitters and receivers are provided on each of the plurality of supports arranged on the cordon, and a logic circuit is provided to apply an output signal from each receiver to apply a control signal to one of the light emitters, and each of the supports is provided with a logic circuit. A light pulse emitted from a light emitter is sequentially incident on corresponding light receivers on adjacent supports, and an alarm is provided which operates according to the output signal of the light receiver on the final stage support, and an alarm is provided on each support. Only the pulsed light emitted from one of the projectors is modulated with the support display signal and the operating state display signal, and the pulsed light emitted from the other projectors is not modulated with a signal and its time width is made small. When the logic circuit in each support always sends out a control signal that modulates the pulsed light with the display signal of the first stage support, and a certain abnormality occurs in the pulsed light incident on each light receiver or in the operating state of the circuit. An infrared warning device characterized in that one of the pulsed lights is modulated and emitted with a signal indicating the abnormal state and its support.