JPH0320793Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a crowding level detection device that measures the number of people and the crowding level from infrared rays emitted by the human body.

The applicant had previously published Japanese Patent Application No. 57-172379 ``Crowding Degree Detection Device'' with the aim of detecting the number of people accurately from infrared rays emitted by the human body with a simple and inexpensive configuration. - No. 192763 proposes ``crowding level detection device''. A detailed explanation of these will be omitted, but the basic configuration is as shown in Figure 1: a condenser lens 2, a scanning mirror 3 that rotates at a constant cycle, and an infrared ray that responds to changes in the incident infrared rays. A detection unit (sensor unit) 1 including a detection element (hereinafter simply referred to as detection element) 4, a preamplifier 10, a bandpass filter 11 for removing noise components, etc., and a sample value for providing a comparison reference potential. A clamper 12, a comparator 1 that outputs a pulse signal when the input signal is at a predetermined level or higher.
3. It consists of a digital multiplexer circuit 14 which emits an output 14a as a sequence of clock pulse numbers corresponding to the pulse width of the pulse signal, a synchronization circuit 15 which sets the detection field of view from the synchronization signal 3a of the scanning mirror 3, and outputs the output signal of the detection element 4. Using the relationship that the width of the waveform is approximately proportional to the number of people being measured, the output 14a
It counts the number of clock pulses and measures the number of people within the field of view. Note that FIG. 1 shows only one channel with one detection element 4, and illustrations of other channels are omitted.

By the way, since the congestion level detection device described above uses a pyroelectric infrared detection element to detect the congestion level, it responds only to changes in the amount of infrared rays incident on the detection element.

On the other hand, at specific times such as at night or on holidays, it is possible to use the above-mentioned congestion level detection device simply as an intruder detection device or a fire detection device, but in this case, the target itself has a component that changes the amount of infrared There is no need to scan. The congestion level detection device described above performs scanning by driving a scanning mirror with a motor, and scanning is performed even when scanning is not necessary, such as when detecting an intruder.
Energy saving. This is unfavorable in terms of motor life, etc.

The present invention was devised in view of the above points.
The purpose is to be able to detect intruders and fires without scanning during specific times such as holidays, etc., and its feature is that the above-mentioned congestion level detection device can detect intruders and fires without scanning during specific times such as nights and holidays. comprising means for stopping a scanning mirror in a predetermined position, and an intruder within a field of view set by the stopped scanning mirror;
The point is that a fire or the like is detected by a circuit that determines the number of people or the degree of crowding.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 2 is a diagram showing the configuration of the sensor section of the congestion degree detection device according to the present invention. In the figure, reference numeral 27 denotes a scanning mirror for performing image plane scanning of the field of view when detecting the degree of congestion, and is driven by a scanning motor 22 via toothed pulleys 21, 24 and a timing belt 23, and is driven at a constant speed. Rotate with. 25a-2
5c is a pyroelectric infrared detection element, and a condenser lens 26
and detects infrared rays within the field of view via the scanning mirror 27. A disk 29 with a slit is attached to the axis of the scanning mirror 27.
is attached, and the rotational position of the scanning mirror 27 is detected by this and a photo interrupter 28, and the field of view is detected. Further, a disc 30 with a notch is attached to the shaft end of the scanning mirror 27, and the scanning mirror 27 can be fixed at a predetermined position by this and a plunger 31.

FIG. 3 shows the configuration of the plunger 31. In the figure, 31 is the main body of the plunger, and a movable rod 32 operates as shown by the arrow by excitation of a built-in solenoid coil (not shown). That is, when detecting an intruder or the like at night or on holidays, the solenoid coil is energized by a signal from a plunger control device (described later) and the movable rod 32 moves to the right. Inside the movable rod 32 are a spring 33 and a steel ball 35.
The spring 33 has one end fixed to the base 34. When the movable rod 32 moves to the right, the disc 3
When the steel ball 35 is pressed against the 0 and reaches the notch 30a, the steel ball 35 fits into the notch 30a and the rotation of the disc 30 stops. Since the stopping position of the disk 30 is determined by the mounting position of the plunger 31, the scanning mirror 27 will stop at an appropriate position so as to face in a predetermined direction.

FIG. 4 is a diagram showing an embodiment of the signal processing system and mechanism control system of the congestion level detection device according to the present invention.
In the figure, 41 is a synchronization circuit for detecting the rotational position of the scanning mirror 27 and setting the field of view based on a signal from the photointerrupter 28, 42 is a preamplifier, and 43
44 is a waveform analysis circuit consisting of a band filter, a clamper, a comparator (corresponding to 11, 12, 13 in Figure 1), etc., and a multiplexer (corresponding to 14 in Figure 1), etc., which combines the signals of each channel. 46 is a clock device that outputs a signal at a preset time; 45 is a motor 2;
2 is a control circuit, and 47 is a control circuit for the plunger 31.

In the above configuration, the scanning mirror 27 is normally rotated to perform scanning, and the degree of congestion within the field of view is detected from the signals detected by the detection elements 25a to 25c via the preamplifier 42 and the waveform analysis circuit 43. , is output from the output circuit 44. When only detecting intruders, fires, etc. at night or on holidays, the clock device 46 is activated at a preset time and a signal pulse is sent to the output circuit 44, motor control circuit 45, and plunger control circuit 47. Emitted. This causes the plunger 31 to operate, and as described above, the scanning mirror 27 is directed in a predetermined direction and stopped at an appropriate position. Further, the motor control circuit 45 receives a signal from the clock device 46 to control the motor 22 after a certain period of time.
This prevents the motor 22 from burning out. In this state, if an intruder enters the field of view of the stopped scanning mirror, or if a fire breaks out within the field of view, the amount of infrared rays incident on the pyroelectric infrared detection element changes, and the scanning mirror A signal can be obtained even if the machine remains stopped. In response to the signal from the clock device 46, the output circuit 44 outputs information such as the presence or absence of an intruder instead of the degree of congestion, thereby making it possible to activate an alarm device.

As described above, according to the present invention, it can be used as a congestion level detection device or at night. It can be used as an intruder and fire detection device during specific times such as holidays.
Moreover, since scanning is performed only when necessary,
It is possible to save energy and extend the life of the scanning motor, which is effective in improving economic efficiency.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a conventional congestion level detection device, FIG. 2 is a diagram showing the configuration of the sensor section of the congestion level detection device according to the present invention, FIG. 3 is a diagram showing the configuration of the plunger, and FIG. The figure is a diagram showing an embodiment of the signal processing system and mechanism control system of the congestion level detection device according to the present invention. 22...Scanning motor, 25a-25c...Pyroelectric infrared detection element, 26...Condensing lens, 27
... Scanning mirror, 28 ... Photo interrupter, 29
...disc with slit, 30...disc with notch, 31...plunger, 41...synchronous circuit,
42... Preamplifier, 43... Waveform analysis circuit, 4
4...Output circuit, 45...Motor control circuit, 46
... Clock device, 47 ... Plunger control circuit.

Claims (1)

[Claims for Utility Model Registration] A scanning mirror that rotates at a constant cycle, an infrared detection element that outputs a signal according to changes in infrared rays incident through the scanning mirror, and a signal synchronized with the rotation of the scanning mirror. A synchronization circuit that sets the field of view of the infrared sensing element, an output signal of the infrared sensing element,
A crowding level comprising a circuit that extracts only a signal that is equal to or greater than a predetermined value within the visual field set by the synchronization circuit, and a circuit that determines the number of people or the degree of crowding within the visual field from the waveform width of the signal that is equal to or greater than the predetermined value. The detection device includes means for stopping the scanning mirror at a predetermined position at specific times such as at night or on holidays, and detects an intruder, fire, etc. within a field of view set by the stopped scanning mirror by the circuit that performs the determination. A congestion degree detection device characterized by: