JPH062155Y2 - Occupant detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a detector of a type that detects the movement of a person moving indoors as the amount of change caused by the movement, and The present invention relates to a technique for detecting a minute movement of a human who has stopped by using it.

[Conventional technology]

Conventionally, passive infrared detectors, ultrasonic detectors, microwave detectors, etc. have been used as crime prevention detectors for detecting humans that have entered the room, but these are due to human walking in the detection area. Since it detects large fluctuations, it cannot detect the minute movements of humans that have stopped within the detection area. In the case of detecting the presence of a human using this type of detector, the output time of the detector is simply lengthened by a timer circuit.

[Problems to be solved by the invention]

The conventional method is based on the assumption that a person walks within the detection area again while the timer is operating. There was a problem that it was not detected as an occupant in the sense of.

[Means for solving problems]

The present invention utilizes a signal from the detection unit through the amplification unit, and connects the determination unit in which the threshold level changes and the timer unit which is activated from the beginning every time the activation signal is input.

[Action]

When the signal from the amplifier exceeds the higher threshold level, the determination section sends a signal to the timer section to activate the timer section and lower the threshold level for a certain period of time. As a result, an activation signal is sent from the determination unit to the timer unit even for a minute signal, the timer unit returns to the initial state, restarts, and continues the detection output.

In other words, once a person enters the detection area, a faint signal due to a minute movement of the person who has stopped in the detection area can be detected, and the person in the room can be surely detected.

〔Example〕

FIG. 1 is a block diagram showing the configuration of an in-room detector of the present invention. The signal from the detection unit 1 is amplified by the amplification unit 2 and input to the determination unit 3. The determination unit 3 is AD
Converter 31, control unit 32, timer start signal output unit 33
The signal from the determination unit 3 is input to the timer unit 4. The timer unit 4 operates from the beginning each time a signal is input, and outputs an output signal continuously for a fixed time. The signal from here is input to the output unit 5, and is output from the output unit 5 to the outside as a room occupant signal. The control unit in the determination unit 3 monitors the signal digitized by the A / D converter, and when it shows a value exceeding the first determination value (threshold level), the timer start signal generation unit A signal is output from 33. For a certain time after issuing this signal,
A second determination value set to a value smaller than the first setting value is used as a reference, and when this value is exceeded, a timer start signal is output.

FIG. 2 is a diagram showing an input signal and an output signal to the determination unit 3 and an output signal of the timer unit 4 of the detection device.
The solid line in (a) shows the input signal (the output signal of the amplification section 2), and the broken line shows the threshold level. (B) is the output of the determination unit 3, and (c) is the output of the timer unit 4. The horizontal axis represents time and the vertical axis represents voltage value. At time t1, the input signal exceeds the threshold level (first determination value), the determination unit 3 outputs an output signal, and the timer unit 4 outputs. At the same time, the threshold level drops to the second judgment value. The time between t1 and t2 indicates the state where a human is present in the detection area. During this time, the threshold level is decreasing,
An output is output from the determination unit even with a slight signal fluctuation. If you set the timer time longer than this output interval,
The output of the timer unit 4 is continuously output. The time between t2 and t3 is the timer time, and the output from the timer unit 4 disappears after this time elapses, and the threshold level returns to the original state. After that, there is no risk of operation even if the signal fluctuates due to some disturbance until the signal exceeding the first judgment value is input to the judgment unit 3 again. If the timer time and the threshold level can be freely set and changed, it is possible to detect the person in the room most efficiently in accordance with the characteristics such as the sensitivity of the detection unit.

[Effect of device]

As described above, according to the present invention, it is possible to detect humans existing in the detection area by using the detection signal after amplification of a normal moving object detector, so that it is expected to have many applications not only for crime prevention. Therefore, a great effect can be obtained in improving the performance of this type of detection device.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an in-room detector of the present invention. FIG. 2 is a waveform diagram for explaining the operation.

Claims (1)

[Scope of utility model registration request] 1. An amplification section of a passive infrared detector comprising a detection section for detecting an amount of change in infrared energy radiated by an object and generating an electric signal, and an amplification section for amplifying a signal from the detection section. A device which receives a signal from the device as an input, and which outputs a timer start signal when the signal exceeds the first determination value, and then outputs a timer start signal for a certain period of time which is smaller than the first determination value. An occupancy room, comprising: a determination unit that outputs a timer activation signal when the signal exceeds the determination value of 2; and a timer unit that outputs a detection signal for a fixed time each time the timer activation signal is input. Person detection device.