JPH0430637B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a device that notifies from outside whether a person is in a room or not.

Conventional configuration and problems thereof Conventionally, as shown in FIG. 1, this type of room presence determination device places, for example, an infrared sensor 1 at an appropriate position in a room, and measures the intensity of infrared rays 4 emitted from a human body 2. was detected and displayed or notified on the outdoor display 3.

In this configuration, it is necessary and sufficient that the human body be within the field of view of the infrared sensor and within a distance that covers the infrared detection sensitivity.

OBJECTS OF THE INVENTION The present invention solves these conventional problems, and aims to notify the presence or absence of a person in a room without relying solely on the position of a human body in the room.

Structure of the Invention In order to achieve this object, the present invention provides an ultrasonic detection means at an appropriate position in the room, and furthermore, a means for detecting the passage of a human body at an appropriate place on the indoor side and the outdoor side, separated by a door. and a state storage circuit, and a signal processing circuit generated by these detection means.

This configuration has the effect of determining the occupancy state based on the order and state of activation of the indoor side detection means and the signal of the ultrasonic detection means after the outdoor side detection means is activated.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.
This will be explained using figures.

In Fig. 2, 5 is a door, A and B are indoors that are turned on and off when a person passes by, and switches 6 and 7 are embedded in the floor as outdoor detection means. ing. 8 and 9 are flip-flop circuits as state storage circuits, and 10 is a signal processing circuit.

In FIG. 3, a is a pulse train generated by the outdoor side detection means, b is a pulse train generated by the indoor side detection means, c is the output signal of the flip-flop circuit 8 triggered by the pulses a and b, and d is the output signal of the flip-flop circuit 8. 3 shows a temporal change in the output signal of the flip-flop circuit 9 triggered by this.

e is the output signal of the ultrasonic detection means 11, f is
This is the output signal of the signal processing circuit and is a notification signal.

12 is an ultrasonic generator; ultrasonic generator 1
The ultrasonic detection means 11 detects the reflected signal of the ultrasonic signal generated by the ultrasonic signal 2 reflected by the human body.

Flip-flop circuits 8 and 9 are master-slave type flip-flops and constitute a binary counting circuit. In FIGS. 2 and 3, when a person enters the room, switches 7 to 6 are turned on and off, and when a person goes out, switches 6 to 7 are turned on and off. This situation is illustrated by the pulse trains in FIGS. 3a and 3b. When the flip-flop circuit 8 is triggered by this pulse train, the output waveform becomes as shown in FIG. 3c, and this output waveform triggers the flip-flop circuit 9, so that the output waveform of the flip-flop circuit 9 becomes as shown in FIG. 3d. Here, the time from when switch 6 is activated to when switch 7 is activated is the time that a person is present in the room, and corresponds to _T1 .
On the other hand, T ₂ is the time during which the ultrasonic detection means 11 detects the ultrasonic waves reflected from the human body indoors. T ₁ +T ₂ is determined by the signal processing circuit _{10 .}
This is the time for the logical OR operation.

That is, presence in the room is notified by a signal from either the ultrasonic detection means or the state detection means caused by entering the room.

Effects of the Invention As described above, the room occupancy notification device of the present invention provides the following effects.

(1) Since the presence or absence of a person in the room is determined based on both the signal that stores the operating order and operating state of the detection means that are activated when a person moves between indoors and outdoors, and the signal from the ultrasonic detection means, This has the effect of operating more reliably without depending on the position of the person in the room.

(2) For the above reasons, the detection means and signal processing circuit are simplified.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a conventional room occupancy notification device, FIG. 2 is a configuration diagram of a room occupancy notification device according to an embodiment of the present invention, and FIG. 3 is a timing chart of the same room occupancy determination device. 5...Door, 6...Indoor side detection means, 7...Outdoor side detection means, 8, 9...State detection means, 11...
...Ultrasonic detection means, 10... Signal processing circuit.

Claims (1)

[Claims] 1. Indoor side detection means and outdoor side detection means that are separated by a door and detect the passage of a human body, and respective output signals when the indoor side detection means is activated after the outdoor side detection means is activated, in this order. a state memory circuit that stores the stored state and holds the stored state until the next output signal in the reverse order of the output signal is input; an ultrasonic detection means disposed indoors; and the state memory. A room occupancy notification device comprising a signal processing circuit that reports the presence of the human body in the room based on output signals from the circuit and the ultrasonic detection means.