JP3564991B2 - Human body detection switch - Google Patents

Description

[0001]
TECHNICAL 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]
[Prior art]
The conventional human body detection switch includes an ultrasonic detection sensor unit A, a hot-wire detection sensor unit B, a comprehensive judgment unit C, and an illumination control circuit D, as shown in FIG.
[0003]
The ultrasonic detection sensor unit A transmits an ultrasonic wave having a predetermined frequency into the presence detection area A2 corresponding to the second area using an ultrasonic transducer, and transmits an ultrasonic wave from an object in the presence detection area A2. The presence of an object is detected by receiving the reflected wave from the ultrasonic transducer. The presence detection area A2 refers to a space in which 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.
[0004]
The hot-wire detection sensor unit B uses a pyroelectric element capable of detecting a temperature change caused by heat radiated by the human body H in the movement detection area A1 corresponding to the first area. This is to detect movement.
[0005]
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, It comprises an amplification circuit 14, a detection circuit 15, and an ultrasonic judgment circuit 16.
[0007]
The hot-wire detection sensor section B includes a light collector 17, a pyroelectric element 18, an amplifier circuit 19, and a hot-wire determination circuit 20.
[0008]
In the ultrasonic detection sensor unit A, the high-frequency oscillation signal output from the transmitter 10 becomes a tone burst wave in the transmission circuit 11 and is transmitted and received at the transmission interval determined by the transmission interval determiner 12. It is intermittently transmitted as ultrasonic waves from the device 13.
[0009]
The transmitted ultrasonic wave is reflected by an object in the presence detection area A2, is received by the ultrasonic transmitter / receiver 13 as a reflected wave, and is converted into a received signal that 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 waveform pattern most recently received 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.
[0010]
In the hot-wire detection sensor section B, the light collector 17 includes a lens or a reflecting mirror, 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 a temperature change 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 inputs the amplified output to the heat ray determination circuit 20. If the input voltage is higher than the threshold voltage, the hot-wire determination circuit 20 determines that the human body H has moved in the movement detection area A1, and outputs a movement detection signal.
[0011]
The overall determination unit C monitors the presence / absence of the presence detection signal output from the ultrasonic determination circuit 16 and the presence / absence of the movement detection signal output from the hot-wire determination circuit 20, and comprehensively determines the presence / absence of the human body H from the logical sum of the signals. To judge. If either signal is output, it is determined that a human body is present, and a human body detection signal is output. When neither signal is output, it is determined that the human body H does not exist, and the human body non-detection signal is output after the off-delay time has elapsed.
[0012]
The illumination control circuit D turns on the connected illumination when the human body detection signal is output, dims the connected illumination for a predetermined time when the human body non-detection signal is output, and then turns off. For example, in toilet lighting or the like, 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]
[Problems to be solved by the invention]
In the human body detection switch having the above-described configuration, when the human body H exits the presence detection area A2 and stops in the movement detection area A1, the light is dimmed after the elapse of the off-delay time, and the light is turned off after the elapse of a predetermined time. I will. 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.
[0014]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a human body detection capable of preventing a problem that lighting is turned off despite the presence of a human body. It is to provide a switch.
[0015]
[Means for Solving the Problems]
The invention according to claim 1 is 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 and outputs a movement detection signal, The ultrasonic wave is transmitted to the second area included in the first area, and the waveform pattern of the obtained reflected wave is compared with the waveform pattern of the reflected wave immediately before the movement detection signal is output. For example, 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, and detects movement. When both the signal and the presence detection signal are not output, a general judgment unit that outputs a human body non-detection signal after a predetermined off-delay time elapses, and when the human body detection signal is output, turns on the illumination and detects the human body no detection Signal When a movement detection signal is output during the dimming time, the illumination is turned off when the light is dimmed and the illumination control circuit turns off the illumination after a predetermined dimming time has elapsed. Is normally lit again, and the off-delay time is extended for a predetermined time.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.
[0017]
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.
[0018]
The human body detection switch is mounted on a ceiling of a toilet or the like, and controls lighting and turning off of a lighting device (not shown) of the toilet by accurately detecting a human body in a monitoring space.
[0019]
In FIG. 1, the human body detection switch includes an ultrasonic detection sensor unit A, a hot-wire detection sensor unit B, an overall judgment unit C, and an illumination control circuit D.
[0020]
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, an ultrasonic determination circuit 16 Consists of The hot-wire detection sensor section B includes a light collector 17, a pyroelectric element 18, an amplifier circuit 19, and a hot-wire determination circuit 20.
[0021]
When the movement detection signal is output from the hot-wire detection sensor unit 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. 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 no longer output again, the illumination control circuit D is notified when the extended off-delay time has elapsed. And a human body non-detection signal is output. After the lighting is turned off, the off-delay time is reset to the initial value.
[0022]
Next, the operation in the present 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 of the human body H or the like.
[0023]
Next, it is assumed that the human body H exits the presence detection area A2 and starts a hand-washing operation in the washstand set in the movement detection area A1. Since the hand-washing operation is extremely minute, the movement detection signal is stopped a while 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, a person moves unconsciously due to a change in illumination, a movement detection signal is output again, the illumination is fully turned on again, and the off-delay time is extended.
[0024]
Furthermore, 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 in the previous case, and the lighting is fully lit. Will last. When the human body opens the toilet door and leaves the room, the movement detection signal is stopped for a while, and when the extended off-delay time (here, 30 seconds) elapses, the illumination is gradually dimmed and finally turned off.
[0025]
According to the present embodiment, the off-delay time elapses when the human body H is in a state where there is only a slight movement such as washing his / her hand in the washstand installed in the movement detection area A1 outside the presence detection area A2. Although the light is dimmed later, the illumination is normally turned on again when the human body H moves due to a change in the illumination state, so that the problem that the illumination is turned off despite the presence of the human body H can be solved. It becomes. Further, 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]
【The invention's effect】
As described above, according to the first aspect of the present invention, when the amount of change of the heat ray in the first area is larger than a predetermined threshold, it is determined that the human body has moved, and a movement detection signal is output. A hot-wire detection sensor unit and a waveform pattern of a reflected wave obtained by transmitting an ultrasonic wave to a second area included in the first area and a waveform pattern of a reflected wave immediately before a movement detection signal is output And an ultrasonic detection sensor unit that outputs a presence detection signal assuming that an object is present in the second area if different, and a human body if a movement detection signal or a presence detection signal is output. When the detection signal is output, and the movement detection signal and the presence detection signal are not output together, a comprehensive judgment unit that outputs a human body non-detection signal after a predetermined off-delay time elapses, and a human body detection signal is output Point lighting When a human body non-detection signal is output, the illumination is dimmed, and a human body detection switch including an illumination control circuit that turns off the illumination after a predetermined dimming time has elapsed. When the signal is output, the lighting is turned on again normally and the off-delay time is extended for a predetermined time, so even if the dimming of the lighting is started, if the human body moves unconsciously, the lighting is turned on again Therefore, there is an effect that it is possible to provide a human body detection switch that can prevent a problem that the illumination is turned off despite the presence of a human body.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram illustrating 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, wherein 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

Claims (1)

A hot-wire detection sensor unit that determines that the human body has moved when the amount of change of the heat ray in the first area is larger than a predetermined threshold and outputs a movement detection signal; The ultrasonic wave is transmitted to the area 2 and the waveform pattern of the obtained reflected wave is compared with the waveform pattern of the reflected wave 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 if a movement detection signal or a 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 elapses, when the movement detection signal is output during the dimming time, the illumination is normally turned on again, and the off delay is performed. A human body detection switch wherein the time is extended for a predetermined time.

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