JPH11214180A - Human body detection switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a human body detection switch preventing such inconvenience that illumination is turned off irrespective of the presence of a human body. SOLUTION: In a human body detection switch provided with a heat ray detection sensor part B which detects the movement of a human body based on a change amount of heat rays in a first area and outputs a movement detection signal, an ultrasonic wave detection sensor part A which sends ultrasonic waves to a second area and outputs a presence detection signal when a waveform pattern of the obtained reflected wave differs from a waveform pattern of a reflected wave immediately before the movement detection signal is output, a general judging part C which outputs human body detection signal when the movement detection signal or the presence detection signal is output and outputs a human body absence detection signal after off delay time determined in advance elapses in the other cases, and an illumination control circuit D which lights illumination when the human body detection signal is output and reduces light of illumination gradually when the human body absence detection signal is output, illumination is lit again as usual when the movement detection signal is output during light reducing time and off delay time is prolonged for a predetermined time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a human body detection switch that detects a human body and automatically turns on illumination.

[0002]

2. Description of the Related Art A conventional human body detection switch comprises an ultrasonic detection sensor section A, a hot-wire detection sensor section B, an overall judgment section C, and an illumination control circuit D, as shown in FIG.

[0003] The ultrasonic detection sensor unit A uses an ultrasonic transducer to transmit an ultrasonic wave having a predetermined frequency into a presence detection area A2 corresponding to a second area.
The presence of an object is detected by receiving a reflected wave from the object within the ultrasonic wave 2 by an ultrasonic vibrator. The presence detection area A2 refers to a space where the transmitted ultrasonic wave can be received when the transmitted ultrasonic wave is reflected by an object that has entered the presence detection area A2. This is a space where intruders can be detected.

The hot-wire detection sensor section B uses a pyroelectric element capable of detecting a temperature change caused by heat radiated by the human body H in a movement detection area A1 corresponding to a first area. This is for detecting the movement of the human body H.

Here, the movement detection area A1 is a space that includes the presence detection area A2 and is wider than the presence detection area A2, and is a space in which the movement of the human body H can be detected by the hot-wire detection sensor unit B.

[0006] The ultrasonic detection sensor unit A includes a transmitter 10
, A transmission circuit 11, a transmission interval determiner 12, an ultrasonic transmitter / receiver 13 having both an ultrasonic transmitter and an ultrasonic receiver
, An amplification circuit 14, a detection circuit 15, and an ultrasonic determination circuit 16.

[0007] The hot-wire detection sensor section B includes a light collector 17,
It comprises a pyroelectric element 18, an amplification circuit 19, and a hot-wire determination circuit 20.

In the ultrasonic detection sensor unit A, a high-frequency oscillation signal output from the transmitter 10 is transmitted to the transmission circuit 11.
Becomes a tone burst wave at the transmission interval determiner 12
Are transmitted intermittently as ultrasonic waves from the ultrasonic transmitter / receiver 13 at the transmission intervals determined by the above.

The transmitted ultrasonic wave is transmitted to the presence detection area A2.
It is reflected by an object inside, is received by the ultrasonic transducer 13 as a reflected wave, and is converted into a received signal which is a voltage signal. The received signal is amplified by the amplification circuit 14 and then detected by the detection circuit 15. Based on the detection signal detected by the detection circuit 15, the ultrasonic determination circuit 16 compares the most recently received waveform pattern of the presence of the human body with the waveform pattern immediately before the movement detection signal is output from the heat ray determination unit, If they are the same, it is determined that the human body H does not exist. Otherwise, the ultrasonic detection circuit 16 outputs a presence detection signal assuming that the human body H exists in the presence detection area A2.

In the hot-wire detection sensor section B, the light collector 1
Reference numeral 7 includes a lens or a reflector, and collects heat rays radiated from an object such as a human body. The collected heat rays are detected by the pyroelectric element 18 as a temperature change.
The output current of the pyroelectric element 18 that changes according to the temperature change is
It is converted into a voltage and output from the pyroelectric element 18. The amplification circuit 19 amplifies the output of the pyroelectric element 18 and
Enter 0. If the input voltage is larger than the threshold voltage, the hot-wire determination circuit 20 determines that the human body H is within the movement detection area A1.
And a movement detection signal is output.

The overall judgment unit C monitors the presence / absence of the presence detection signal output from the ultrasonic judgment circuit 16 and the movement detection signal output from the hot-wire judgment circuit 20. Judge comprehensively. If either signal is output, it is determined that a human body is present, and a human body detection signal is output. If neither signal is output, it is determined that the human body H does not exist, and a human body non-detection signal is output after the off-delay time has elapsed.

The illumination control circuit D turns on the connected illumination when the human body detection signal is output, and dims the connected illumination for a predetermined time when the human body non-detection signal is output, and then turns off the illumination. . For example, in toilet lighting
It is possible to control such that the lighting is turned on at the same time when the human body H enters the toilet, and after a while after leaving the room, the lighting is dimmed and then turned off.

[0013]

When the human body H exits the presence detection area A2 and stops at the movement detection area A1, the light is dimmed after the elapse of the off-delay time. The lighting is turned off after a lapse of time. Therefore, for example, if the human body H is in a state where there is only a slight movement such as washing his / her hand on the washstand installed in the movement detection area A1 outside the presence detection area A2 after using the toilet, the light is turned off. There is a problem that it is.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent a problem that the lighting is turned off despite the presence of a human body. An object of the present invention is to provide a human body detection switch.

[0015]

According to the first aspect of the present invention,
A hot-wire detection sensor unit that determines that a human body has moved when the amount of change of the heat ray in the first area is larger than a predetermined threshold value and outputs a movement detection signal; The ultrasonic wave is transmitted to the area 2 and the obtained reflected wave waveform pattern is compared with the reflected wave waveform pattern immediately before the movement detection signal is output. And an ultrasonic detection sensor unit that outputs a presence detection signal as if there is, and outputs a human body detection signal when the movement detection signal or the presence detection signal is output, and outputs both the movement detection signal and the presence detection signal If not, a general judgment unit that outputs a no-body detection signal after a predetermined off-delay time has elapsed, and turns on the illumination when the no-body detection signal is output, and turns off the illumination when the no-body detection signal is output. Dimming A human body detection switch having an illumination control circuit for turning off the illumination after a predetermined dimming time has elapsed. When a movement detection signal is output during the dimming time, the illumination is normally turned on again, and the off delay is performed. The time is extended by a predetermined time.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS.

FIG. 1 is a schematic configuration diagram showing the configuration of the human body detection switch. 2A and 2B are diagrams showing the state of the detection area and the output of the sensor unit at that time. FIG. 2A shows the state of the human body in the detection area, FIG. 2B shows the output signal of the hot-wire type detection sensor unit, c) shows the signal output of the ultrasonic detection sensor unit. 3A and 3B are time charts showing the operation of the human body detection switch. FIG. 3A shows the state of the human body, FIG. 3B shows the signal output of the movement detection signal, and FIG. 3C shows the signal output of the presence detection signal. , (D) shows the illumination output, and (e) shows the lighting state of the illumination.

The human body detection switch is mounted on the ceiling of a toilet or the like, and controls the lighting and unlit of a lighting device (not shown) of the toilet by accurately detecting a human body in the monitoring space.

Referring to FIG. 1, the human body detection switch includes an ultrasonic detection sensor A, a hot-wire detection sensor B, an overall judgment unit C, and an illumination control circuit D.

The ultrasonic detection sensor unit A includes a transmitter 10
, A transmission circuit 11, a transmission interval determiner 12, an ultrasonic transceiver 13, an amplification circuit 14, a detection circuit 15, and an ultrasonic determination circuit 16. The hot-wire detection sensor unit B is
It comprises a condenser 17, a pyroelectric element 18, an amplification circuit 19, and a heat ray determination circuit 20.

When the movement detection signal is output from the hot-wire detection sensor section B while the illumination is dimmed by the illumination determination circuit D, the comprehensive determination circuit C outputs a human body detection signal to the illumination determination circuit. I do. In addition, the counted off-delay time is reset and the off-delay time is extended. When the presence detection signal output from the ultrasonic determination circuit 16 and the movement detection signal output from the hot-wire determination circuit 20 are not output again, the illumination control circuit D is output after the extended off-delay time has elapsed.
, A human body non-detection signal is output. After the lights are turned off,
The off-delay time will be reset to the initial value.

Next, the operation of this embodiment will be described with reference to FIG. When the human body H enters the room, a movement detection signal is output. Then, since the human body detection signal is output, the lighting is fully turned on. When the human body H sits on the toilet seat,
A presence detection signal is output by a reflected wave reflected from the head or the like of the human body H.

Next, it is assumed that the human body H exits the presence detection area A2 and starts a hand-washing operation in the washstand installed in the movement detection area A1. Since the hand-washing operation is very slight, the movement detection signal is stopped a little after the start of hand-washing, and the off-delay time (here, 10 seconds)
Is counted. After the off-delay time has elapsed, the illumination will be dimmed. Then, the person unconsciously moves due to the change in the lighting, the movement detection signal is output again, the lighting is fully turned on again, and the off-delay time is extended.

Further, even if the human body H continues the hand-washing operation and the movement detection signal is not output again, the off-delay time is extended, so that the lighting is not immediately dimmed as before but all lights are turned on. State will be maintained. When the human body opens the door of the toilet and leaves the room, the movement detection signal is stopped for a while, and when the extended off-delay time (30 seconds in this case) elapses, the illumination is gradually reduced and finally turned off.

According to the present embodiment, the presence detection area A
If the human body H is in a state where there is only a slight movement such as washing his / her hand in the wash basin installed in the movement detection area A1 outside the outside, the light is dimmed after the off-delay time has elapsed, but the lighting state changes. Accordingly, when the human body H moves, the illumination is normally turned on again, so that the problem that the illumination is turned off despite the presence of the human body H can be solved. In addition, since the off-delay time is extended for a predetermined time, it is possible to avoid a situation in which the light is immediately dimmed immediately after the normal lighting state is restored.

[0026]

As described above, according to the first aspect of the present invention, when the variation of the heat ray in the first area is larger than a predetermined threshold, it is determined that the human body has moved, and the movement is performed. A hot-wire detection sensor for outputting a detection signal;
Transmitting an ultrasonic wave to a second area included in the area of
The obtained reflected wave waveform pattern is compared with the reflected wave waveform pattern immediately before the movement detection signal is output, and if they are different, it is determined that an object is present in the second area and the presence detection signal is output. The sonic detection sensor unit outputs a human body detection signal when a movement detection signal or a presence detection signal is output, and a predetermined off delay when neither the movement detection signal nor the presence detection signal is output. A general judgment unit that outputs a human body non-detection signal after a lapse of time, turns on the illumination when the human body detection signal is output, dims the illumination when the human body non-detection signal is output, and sets a predetermined dimming time. When a movement detection signal is output during the dimming time, the lighting is normally turned on again and the off-delay time is set to a predetermined time. Even if the dimming of the lighting is started, if the human body moves unknowingly, the lighting will be turned on again, so that the lighting will be turned off despite the presence of the human body. This has the effect of providing a human body detection switch that can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a configuration of a human body detection switch.

2A and 2B are diagrams illustrating a state of a detection area and an output of a sensor unit at that time, where FIG. 2A illustrates a state of a human body in the detection area, FIG. 2B illustrates an output signal of a hot-wire type detection sensor unit,
(C) shows the signal output of the ultrasonic detection sensor unit.

3A and 3B are time charts showing an operation of a human body detection switch, wherein FIG. 3A shows a state of a human body, FIG. 3B shows a signal output of a movement detection signal, and FIG. 3C shows a signal output of a presence detection signal. (D) shows the illumination output, and (e) shows the lighting state of the illumination.

FIG. 4 is a schematic configuration diagram illustrating a configuration of a conventional human body detection switch.

[Explanation of symbols]

 A Ultrasonic detection sensor section B Hot-wire detection sensor section C Comprehensive judgment section D Lighting control circuit

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01H 35/00 H01H 35/00 P G01V 9/04

Claims (1)

[Claims] 1. A hot-wire detection sensor unit that determines that a human body has moved when a change amount of a heat ray in a first area is larger than a predetermined threshold and outputs a movement detection signal, and a first area. Transmitting an ultrasonic wave to the second area encompassed by, comparing the waveform pattern of the obtained reflected wave with the waveform pattern of the reflected wave immediately before the movement detection signal is output,
If different, an ultrasonic detection sensor unit that outputs a presence detection signal assuming that an object is present in the second area, and outputs a human body detection signal when a movement detection signal or a presence detection signal is output When both the movement detection signal and the presence detection signal are not output, a comprehensive judgment unit that outputs a human body non-detection signal after the elapse of a predetermined off-delay time, and turns on the illumination when the human body detection signal is output, When a human body non-detection signal is output, the illumination is dimmed, and a lighting control circuit that turns off the illumination after a predetermined dimming time has elapsed. When it is output, the light is turned on again normally,
A human body detection switch wherein the off-delay time is extended for a predetermined time.