JPH08220250A - Human body detection device - Google Patents

Abstract

PURPOSE: To provide a human body detection device capable of properly detecting a human body. CONSTITUTION: This device is equipped with the first detection means 1 for detecting the motion of a human body, the second detection means 2 for detecting the existence of an object, the first signal generation circuit 3 for generating the first signal (b), when the motion of a human body is detected with the means 1, a control circuit 4 for generating a control signal (c) to keep the means 2 operable, upon receipt of the signal (a), and the second signal generation circuit 5 for generating the second signal (d) when the existence of an object is detected with the means 2 during the generation of the control signal (c).

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present application relates to a human body detection device.

[0002]

2. Description of the Related Art As a human body detecting device, a human body is detected by detecting the movement of the human body by using a pyroelectric infrared sensor or the like, or a transmitting means for transmitting a signal such as light and an object are reflected. There is one which detects a human body by detecting the presence of an object using a transmission / reception type sensor or the like which is composed of a receiving means for receiving the signal such as the light.

[0003]

However, in the case of detecting a human body by detecting the movement of the human body, there is a problem that a stationary human body cannot be detected. Further, in the case of detecting a human body by detecting the presence of an object, there is a problem that an object other than the human body is also detected. Therefore, in either case, it is difficult to reliably detect the human body, and a malfunction is likely to occur.

An object of the invention relating to the present application is to provide a human body detection device capable of surely detecting a human body.

[0005]

A human body detecting apparatus according to the present application comprises a first detecting means for detecting the movement of a human body, a second detecting means for detecting the presence of an object, and a movement of the human body by the first detecting means. A first signal generating circuit for generating a first signal in response to the detection of the first signal, and a control circuit for receiving the first signal and generating a control signal for enabling the second detecting means.
A second signal generating circuit for generating a second signal when the presence of an object is detected by the second detecting means while the control signal is being generated.

[0006]

EXAMPLES Examples will be described below with reference to FIGS. 1, 2 and 3.

FIG. 1 is a block diagram showing the configuration of the embodiment.

The pyroelectric infrared sensor 1 detects that the human body has moved from outside the range indicated by the dotted line to within the range. The light transmitting / receiving sensor 2 detects the presence of an object within the range indicated by the dotted line, and is composed of a light transmitting element 2a and a light receiving element 2b. The light transmitting element 2a is for transmitting light in a predetermined direction, for example, a light emitting diode.
It is configured using the code. The light receiving element 2b receives light from the light projecting element 2a reflected by an object, and is configured using, for example, a PSD (Position Sensitive Device). As shown in FIG. 1, the pyroelectric infrared sensor 1
The detection range of 1 is outside the detection range of the light emitting and receiving sensor 2.

The signal generation circuit 3 includes a pyroelectric infrared sensor 1
The light receiving circuit 3a receives the detection signal "a" from the light receiving circuit 3a and produces an output signal "b" for a certain period (usually about several seconds).
And a clock circuit 3b. Light receiving circuit 3a
Is composed of an amplifier for amplifying the detection signal "a" from the pyroelectric infrared sensor 1, a comparator for comparing the output signal voltage from this amplifier with a predetermined reference voltage, and the like. The time counting circuit 3b receives a detection signal "a" from the pyroelectric infrared sensor 1 and performs time counting operation for a certain period from the time when an output signal is generated from the light receiving circuit 3a.

The RS flip-flop 4 is set by the output signal "b" from the signal generating circuit 3 and reset by the output signal from the gate circuit 6. The control signal “c” from the output “Q” of the RS flip-flop 4 controls the operating state and the non-operating state of the light transmitting / receiving sensor 2.

The signal generating circuit 5 receives the control signal "c" from the RS flip-flop 4 to make the light transmitting / receiving sensor 2 in an operable state, and in this operable state, the light transmitting / receiving sensor 2 has an object. Output signal "d" is generated in the case of detecting the
It is composed of The light sending / receiving circuit 5a sends a light sending signal to the light sending element 2a and receives a light receiving signal from the light receiving element 2b. The operating circuit 5b is for making the light transmitting / receiving circuit 5a operable when the control signal "c" from the RS flip-flop 4 is active.

The operation of FIG. 1 will be described below with reference to the timing charts of FIGS.

When the human body enters the detection range from outside the detection range of the pyroelectric infrared sensor 1, the pyroelectric infrared sensor 1 detects the movement of the human body and generates a detection signal "a". The detection signal "a" is generated only at the moment when the human body crosses the boundary of the detection range of the pyroelectric infrared sensor 1, and becomes a signal as shown in "a" of FIGS. 2 and 3. The detection signal "a" is input to the light receiving circuit 3a, and the time counting operation of the time counting circuit 3b is started in response to the output signal from the light receiving circuit 3a.
The clock signal "b" is output for a certain period. The RS flip-flop 4 is set by the timing signal "b" from the timing circuit 3b, and the control signal "c" becomes active. The operating circuit 5b receives the control signal "c" from the RS flip-flop 4 and makes the light transmitting / receiving circuit 5a operable.

When the human body enters the detection range of the light transmitting / receiving sensor 2, the light transmitting / receiving sensor 2 detects the presence of the human body, and as shown in FIG. 2, the output signal "d" from the light transmitting / receiving circuit 5a. Is output. This output signal “d” continues to be output as long as the human body is within the detection range of the light transmitting / receiving sensor 2. When the human body goes out of the detection range of the light emitting / receiving sensor 2,
The output signal "d" becomes inactive. The output signal "d" is input to one terminal of the gate circuit 6,
The clock signal "b" from the clock circuit 3b is input to the other terminal of the gate circuit 6. Therefore, the RS flip-flop 4 is reset when both the output signal “d” and the clock signal “b” become inactive,
The control signal "c" from the RS flip-flop 4 shifts to the inactive state.

After the human body enters the detection range of the pyroelectric infrared sensor 1, the human body does not enter the detection range of the light transmitting / receiving sensor 2 while the timekeeping signal "b" is held in the active state. , The output signal "d" remains inactive as shown in FIG. Therefore, the RS flip-flop 4 is reset when the clock signal "b" shifts to the inactive state, and the RS flip-flop 4
The control signal "c" from the state transitions to the inactive state.

As described above, in the present embodiment, the output signal "only when the pyroelectric infrared sensor 1 detects the movement of the human body and the light transmitting / receiving sensor 2 detects the presence of the human body within a certain period of time. Since "d" occurs, it is possible to reliably detect the human body, and it is possible to significantly reduce malfunctions. In general, the light-transmitting / receiving sensor 2 consumes much more power than the pyroelectric infrared sensor 1. However, in the present embodiment, the light-receiving sensor 2 is kept in a non-operating state in the normal state. It is possible to significantly reduce power consumption.

[0017]

According to the invention of the present application, the human body can be reliably detected by using the first detecting means for detecting the movement of the human body and the second detecting means for detecting the presence of the object in combination. It is possible to significantly reduce malfunctions.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an example of the present application.

FIG. 2 is a time chart showing the operation of FIG.

FIG. 3 is a time chart showing the operation of FIG.

[Explanation of symbols]

 1 ... Pyroelectric infrared sensor (first detecting means) 2 ... Transmit / receive sensor (second detecting means) 2a ... Light transmitting element (transmitting means) 2b ... Light receiving element (receiving means) 3 ... First signal Generating circuit 4 ... Control circuit 5 ... Second signal generating circuit b ... First signal c ... Control signal d ... Second signal

Claims (3)

[Claims] 1. A first detecting means for detecting the movement of a human body, a second detecting means for detecting the presence of an object, and a first detecting means for detecting the movement of the human body by the first detecting means.
A first signal generating circuit for generating a signal; a control circuit for receiving the first signal to generate a control signal for making the second detecting means operable; and the second circuit when the control signal is generated. A human body detection device, comprising: a second signal generation circuit that generates a second signal when the presence of an object is detected by the detection means. 2. The human body detection device according to claim 1, wherein the first detection means is a pyroelectric infrared sensor. 3. The second detecting means comprises a sending means for sending a signal such as light and a receiving means for receiving the signal such as light reflected by an object. The human body detection device according to claim 1.