JPS581480B2 - Dosakakuninsouchitsukikanshisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a monitoring device used for purposes such as theft prevention.

2. Description of the Related Art A monitoring device used for purposes such as theft prevention is comprised of a detection section and a notification section, which are usually installed separately.

For example, in the case of an infrared monitoring device, the detector, which is the emitter and the receiver, are installed outdoors, and the alarm unit is installed in the night shift room.If an infrared ray reaches the receiver from the emitter and is blocked by an intruder, The method of use is such that a notification unit installed in the night shift room learns of this and takes countermeasures.

On the other hand, these monitoring devices are of no use unless they are constantly confirmed to be operating normally.

For example, in the case of the above-mentioned infrared monitoring device, a car may be parked between the emitter and receiver, blocking the infrared rays, or an object may hit the emitter or receiver, causing the optical axis to shift.
Alternatively, the wiring to each part may be disconnected, and the entire monitoring device may not be able to operate normally.

Therefore, in the past, when using these monitoring devices, a person had to go to the detection unit after the monitoring device was put into operation, actually activate the detection unit, and confirm whether or not the notification unit was reliably reporting the alarm. was.

This confirmation is not very difficult when the distance between the detection unit and the alarm unit is close, but if the distance is a considerable distance, for example several kilometers, it requires a difficult method and it is practically impossible to perform the confirmation operation. There were many things.

For this reason, a time limit means is added to the monitoring device, and after the power is applied until the time limit expires, a state similar to the state in which there was an intruder will be maintained, and after the time limit expires, the state will be similar to the state in which the intruder was present. Japanese Patent Applications No. 47-69688 and No. 48-84258 propose that a state similar to a state in which no state exists can be detected, and a change in this state can be detected by a notification unit to check the operation of the detection unit. However, these proposals are configured so that alarms such as sirens do not operate if the monitoring device is not in normal condition from the beginning, making it difficult for inexperienced operators to overlook that the monitoring device is not normal. was there.

In view of the current situation, the present invention provides a monitoring device in which an alarm is activated after a certain period of time after power is applied if the monitoring device is not normal from the beginning.

Embodiments in which the present invention is applied to an infrared monitoring device will be described below with reference to the drawings.

In Fig. 1, P is a projector that projects infrared rays, R is a receiver that receives infrared rays projected from projector P, and C is an alarm, and projector P and receiver R are separated from alarm C. installed in place.

PL is an indicator light such as a lamp, S is an alarm device such as a siren or buzzer, and each is connected to the alarm device C.

T1 is a time-limited relay that supplies voltage to the floodlight P after a certain period of time has passed after voltage is applied.
It is set longer than the time required for the voltage to be applied to the photodetector R to reach a stable state.

1 is an amplifier, 2 and 3 are NOT circuits, 4 is an AND circuit, T
2 is a second time-limited relay.

The time limit relay T2 continuously outputs a signal after a certain period of time has passed after voltage is applied, and this certain period of time (hereinafter referred to as the time limit time of the time limit relay T2) is set longer than the time limit time of the time limit relay T1. ing.

After the signal from the light receiver R is amplified by the amplifier 1, a part of the signal is sent to the indicator light PL. is operated, and the other signals are applied to an AND circuit 4 via a knot circuit 3 together with the output of a time limit relay T2 to control an alarm S.

When power (not shown) is applied in the above configuration,
First, the receiver R operates, but the emitter P is activated by the time-limited relay T1.
Since the infrared rays have not yet been projected due to the function of the detector R, the signal of the receiver R is in the 0 state, and although the indicator light PL lights up, the time limit relay T2 has not timed out and the alarm S does not operate.

Next, when the time limit relay T1 times out and infrared rays are projected from the emitter P, this reaches the receiver and the receiver R
The signal becomes 1, and the indicator light PL goes out.

Next, when the time limit relay T2 times up, the output of the time limit relay T2 becomes 1 state, but at this time, the not circuit 3
Since the output of is in the 0 state, the alarm S does not operate.

If for some reason the infrared rays projected by the emitter P are not incident on the receiver R from the beginning, the output of the receiver R will continue to be in the 0 state, so until the time limit relay T2 times out. After the indicator light PL lights up and the time limit relay T2 times up, the alarm S operates while the indicator light PL remains lit.

In other words, if the monitoring device is normal, the indicator light lights up for a while when the power is turned on and then turns off. If the monitoring device is not normal, the indicator light PL remains lit and the time limit of time limit relay T2 ends. At the same time, alarm S operates.

When the entire device is normal, the indicator light PL turns on and then goes off as described above, but since the output of the time-limited relay T2 remains at 1, the light receiver R is blocked by an intruder or other light-blocking object. When the reaching infrared rays are cut off, the signal of the light receiver R becomes 0, the indicator light PL lights up, and the alarm S also operates.

When the light blocking object disappears, the signal of the light receiver R becomes 1 state, so the indicator light PL and the alarm S stop operating.

In the above embodiment, the output state of the amplifier 1 and the knot circuits 2 and 3 becomes 0 state when the output of the photoreceiver R is strong or when infrared rays are incident on the photoreceiver R. If it is like that, it is unnecessary and time-limited relay TI
, T2, a similar effect can be obtained by incorporating a time limit means combining a resistor, a capacitor, etc. into an appropriate part of the internal circuit of the projector P or alarm C for control.

Although the above explanation has been made regarding a monitoring device that uses infrared rays as a propagation means between a light emitter and a light receiver, it goes without saying that it can also be applied to a monitoring device that uses ultrasonic waves, electromagnetic waves, etc. as a propagation means.

As described above, in the present invention, since the emitter is provided with the first time limit means, after the time of the time limit means is up, whether or not the indicator light is off or on is used to confirm whether or not the operation between the emitter and the receiver is possible. Since the alarm is controlled by the output of an AND circuit that receives both the output of the receiver and the second time limit means, false alarms are prevented immediately after the power is turned on, and the indicator light is turned off. If an alarm is issued even though the system is in use, it can be confirmed that the operation of the alarm unit is not normal, and the monitoring device as a whole can be prevented from being used in an abnormal state.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a monitoring device showing an embodiment of the present invention. P... Emitter, R... Receiver, C...
...Alarm, PL...Indicator light, S...
・・Alarm, T1, T2・・・Time-limited relay, 1・
...Amplifier, 2, 3...Knot circuit, 4
...and circuit.

Claims (1)

[Claims] 1. A light emitter that projects a propagation means such as infrared rays, a light receiver R serving as a detection unit that detects the presence or absence of the propagation means and outputs a 1 state when the light is being received, and a light receiver connected to the output side of the light receiver. Knot circuit 2, knot circuit 3, indicator light PL
In a monitoring device consisting of an alarm S and an alarm S, a first
A second time limiter set longer than the first time limiter and an AND circuit are connected between the light receiver and the alarm, with both outputs of the light receiver on the input side and the output side serving as the alarm. After power is applied to the device, the indicator lamp lights up, and after the first time limiter times out, if the receiver is normally receiving the propagation means, the indicator light goes out and the second timer turns on before the timer expires. is a monitoring device with an operation confirmation device, characterized in that an alarm is prevented from operating.