JP2015122217A - Entry and exit detection switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an entry and exit detection switch which detects entry and exit of a person into and from a private room such as a toilet automatically and reliably, and capable of lighting a lighting fixture at the time of entry, and unlighting the lighting fixture at the time of exit.SOLUTION: An entry and exit detection switch 1 includes an entry and exit direction determination unit 60 for determining the entry and exit direction of a human body, by arranging two kinds of human body detection sensors 20a, 30a, outputting two kinds of different signal waveforms of a human body detection signal, in series in the entry and exit direction near the doorway of the room, and detecting the difference of the signal waveforms of different kind of human body detection signals detected sequentially by the two kinds of human body detection sensors 20a, 30a.

Description

  The present invention relates to an entry / exit detection switch that detects a person entering / exiting a private room such as a toilet, determines the direction of entry / exit at the time of entry / exit, and enables lighting / extinguishing of a lighting fixture based on the result.

  Conventionally, as a known example for detecting the direction of entering / exiting a private room such as a toilet, a time difference is used, and two sensors A and B of the same kind are physically separated along the direction of entry / exit. The human body is detected in the order of sensors A and B by utilizing the fact that there is a time difference between the time (time) when the person is detected by sensor A and the time (time) when the same person is detected by sensor B. If it is done, it can be detected that the person has moved from A to B, and if a human body is detected in the reverse order of sensors B and A, it can be detected that the person has moved from B to A.

  As such a prior example, an apparatus is disclosed that uses two pyroelectric infrared sensors to detect the presence or absence of a toilet user by detecting the entrance to and exit from the toilet based on the difference in detection time between both pyroelectric infrared sensors. (For example, refer to Patent Document 1).

  In addition, a technology for detecting the infrared rays radiated from the human body with two pyroelectric infrared sensors, determining the moving direction of the human body, and outputting a greeting voice from the speaker to the visitor has already been put into practical use (for example, , See Patent Document 2).

  Furthermore, the technology that detects the near infrared rays and automatically opens and closes the door detects the presence of an object in front of the door with the near infrared rays, confirms that the object is a human body with the far infrared rays, and opens and closes the door. (See, for example, Patent Document 3).

  By the way, in the conventional pyroelectric infrared sensor used for human body detection, a temperature change based on infrared rays from the human body is detected as a voltage, and thus human body detection is performed when there is no movement of the human body in a private room such as a toilet. As a result, it becomes difficult to control the lighting, and there is a problem that the lighting apparatus is turned off while the person is at the toilet seat position.

  To solve the above basic problems, lighting fixtures can be turned on and off without detecting human bodies in private rooms, as long as people can enter and leave private rooms such as toilets. It is.

  However, for example, a known example such as Patent Document 1 functions effectively when the detection of two sensors A and B of the same type are arranged at an interval (distance) that can be reliably identified, In order to detect entry / exit into the room, it is necessary to place two sensors A and B close to each other in the vicinity of the entrance / exit of a narrow space. When the same kind of infrared rays (or the same kind of infrared rays reflected from the human body) radiated from the human body are received by two sensors A and B of the same kind placed at two close points, in addition to direct waves from the human body. The detection output of the two sensors cannot be separated as detection signals corresponding to the two points, such as when the reflected waves reflected in the room are mixedly received or there are harmonics in addition to the main infrared wave. Could not be used to determine the direction of entry and exit. In other words, the frequency characteristics of the two pyroelectric infrared sensors are extremely low, and the outputs of the two pyroelectric infrared sensors overlap each other with respect to the movement of a person in a small private room such as a toilet. There were many problems with the processing of the signals to be used, and it was difficult to put into practical use.

Japanese Patent Laid-Open No. 1-1121422 Japanese Patent No. 2766820 JP 2013-61273 A

  Therefore, in view of the above problems, the present invention can reliably determine that a human body has entered or exited a private room such as a toilet, and in response to the determination result, the lighting fixture is turned on when entering the room, and when leaving the room. An object of the present invention is to provide an entry / exit detection switch that can be turned off.

  The entrance / exit detection switch according to one aspect of the present invention has two types of human body detection sensors that output signal waveforms of two different types of human body detection signals, arranged in series along the entrance / exit direction in the vicinity of the entrance / exit of the room, An entry / exit direction determination unit is provided that detects a difference in signal waveform of different types of human body detection signals sequentially detected by the two types of human body detection sensors, and determines the entrance / exit direction of the human body.

  The entrance / exit detection switch according to another embodiment of the present invention is configured by arranging two types of human body detection sensors that output signal waveforms of two different types of human body detection signals, arranged in series along the entrance / exit direction near the entrance / exit of the room, An entrance / exit direction determination unit that detects a difference in signal waveform of different types of human body detection signals sequentially detected by the two types of human body detection sensors and determines an entrance / exit direction of the human body, and an entrance / exit direction determination unit A controller that controls lighting and extinguishing of the lighting fixture based on the determined entrance / exit direction of the human body.

The front view which shows typically the structure which attached the sensor part of the entrance / exit detection switch which concerns on this invention to the ceiling near a doorway of a toilet. The side view of FIG. The block diagram which shows schematic structure of the in / out detection switch of one Embodiment of this invention. FIG. 4 is a circuit block diagram specifically illustrating the configuration of each unit in FIG. 3. The circuit diagram which shows one Example of the light-receiving part in the 1st human body detection part using the infrared transmission / reception type sensor of FIG. The figure which shows an example of the infrared signal light-emitted from the infrared light emitting diode as a light emission part in the infrared transmission-and-reception type sensor of FIG. The bottom view which shows the sensor part containing the 1st human body detection part using the infrared transmission / reception type sensor of FIG. 4, and the 2nd human body detection part using the pyroelectric human sensor. The longitudinal cross-sectional view of FIG. The figure which shows the signal waveform output from the 2nd human body detection part by a pyroelectric human sensor. The figure corresponding to an infrared signal like FIG. 6, and shows an example of the signal waveform output from the light-receiving part in the 1st human body detection part by an infrared transmission / reception type sensor. The circuit diagram which shows the other Example of the light-receiving part in the 1st human body detection part using an infrared transmission / reception type sensor. The figure explaining the human body detection by an infrared transmission / reception type sensor. The figure which shows the detection signal waveform before the human body detection by an infrared transmission / reception type sensor. The figure which shows the human body detection signal waveform at the time of the human body detection by an infrared transmission / reception type sensor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
One of the entrance / exit detection switches of the present invention uses a pyroelectric infrared sensor (hereinafter referred to as a pyroelectric human sensor), and the other uses an infrared transmission / reception sensor (this is composed of a light emitting part and a light receiving part). Therefore, it is possible to determine the direction of entry / exit of a human body into a private room by detecting a difference in signal waveform of different types of human body detection signals using an infrared transmission / reception sensor). The two types of human body detection sensors do not interfere with each other in the detection operation.

  The entry / exit detection switch 1 according to an embodiment of the present invention includes two types of human body detection sensors 20a and 20b that output signal waveforms of two different types of human body detection signals (corresponding to symbols A and B in FIGS. 1 and 2). Are arranged in series along the entrance / exit direction (hereinafter referred to as the entrance / exit direction) near the entrance / exit of the room (corresponding to the door), and the different types of human body detections sequentially detected by the two types of human body detection sensors 20a, 20b. An entry / exit direction determination unit 60 (see FIGS. 3 and 4) for detecting the difference in signal waveform of the signal and determining the entrance / exit direction of the human body is provided. The entry / exit direction is determined by using two different types of sensors A and B, so that different detection signal waveforms are obtained. Therefore, if the detection signal waveforms are detected in the order of A → B, the entry direction is determined. If it is detected in order, it can be determined that the user leaves the room. This determination can be made without error even when entering or leaving a narrow space such as a toilet.

  1 and 2 show a configuration in which the sensor unit 1a of the entrance / exit detection switch 1 (see FIGS. 3 and 4) is attached to a ceiling near an entrance (ie, door) of a private room (for example, a toilet). In addition to the sensor unit 1a, a lighting fixture 2 for illuminating the inside of the toilet is installed on the ceiling in the toilet. Based on the two types of human body detection signals from the first and second human body detection sensors A and B in the sensor unit 1a, lighting and extinguishing of the lighting fixture 2 are controlled.

  As shown in the side view of FIG. 2, the sensor unit 1a includes an infrared transmission / reception type sensor 20a (a light emitting unit 21 and a light receiving unit 22 shown in FIG. 4) on the front side (closer to the entrance / exit) of the toilet. ) Using the first human body detection unit 20 (see FIGS. 3 and 4) is installed, and the first human body detection unit of the infrared transmission / reception type is approached toward the rear side in the entrance direction (from the entrance to the back). A second human body detection unit 30 (see FIGS. 3 and 4) using the electric human sensor 30a is installed. Details are shown in FIGS. 3, 4, 7 and 8 to be described later.

  In FIG. 2, symbol I indicates a detection area near the entrance / exit of the infrared transmission / reception sensor A (corresponding to 20a in FIG. 3). Near-infrared light is irradiated to the detection area I from the light emitting unit 21 of the infrared transmission / reception sensor A, and the near-infrared reflected light reflected from the human body when a person comes to the detection area I is reflected in the infrared transmission / reception sensor A. By receiving light at the light receiving unit 22, it is possible to detect that a person has passed. The detection area I is narrower than the detection area P described later and forms a pinpoint detection area near the doorway (door).

  In FIG. 2, the code | symbol P has shown the detection area of the vicinity of the toilet seat of the pyroelectric human sensor B (equivalent to 30a of FIG. 3). When a person comes into the detection area P of the pyroelectric human sensor B, the far infrared light emitted from the human body is received by the pyroelectric human sensor B so that the human body can be detected. Yes. The detection area P forms a wide detection area near the toilet seat in the private room several times wider than the detection area I described above.

  In FIG. 2, the sensor A irradiates the detection area I with near-infrared light from its light emitting part, and that its light-receiving part receives near-infrared light reflected from the human body when a person has come to the detection area I. The lighting fixture 2 is turned on based on the human body detection output of the sensor A. Then, immediately after that, the sensor B detects that a person has entered the detection area P of the sensor B by detecting a temperature change based on infrared rays radiated from the human body as a voltage. The lighting state of the luminaire 2 is locked by the human body detection output of the sensor B (the switch element 50 in FIG. 3 is fixed on). In this lighted locked state, even if a person is still in the vicinity of the toilet seat in the private room and the sensor B does not receive (detect) the temperature change of the heat ray caused by the human body, the lighting apparatus 2 is not affected by the influence. The lighting state is maintained (held) without turning off. When the person moves in the direction of the entrance and exit and passes through the detection area I of the sensor A while being locked in this lighting state, the sensor A receives the near infrared light reflected from the human body again. The lighting state is released by the human body detection output of the sensor A, and the lighting fixture 2 is turned off. That is, the control unit 40 shown in FIGS. 3 and 4 turns on the luminaire 2 at the moment when a person enters the private room from the entrance and exits the detection area I of the sensor A, and then the person detects the sensor B. The lighting device 2 is turned on in the locked state at the moment of passing through the area P. Thereafter, when a person moves in the direction of leaving the room and passes through the vicinity of the entrance / exit, it enters the detection area I of the sensor A, and at the same time, the locked state of the lighting is released and the lighting fixture 2 is turned off.

With reference to FIG. 3 thru | or FIG. 5, the structure of the in / out detection switch 1 is demonstrated.
The entry / exit detection switch 1 includes an AC power supply unit AC, a DC power supply unit 10, a first human body detection unit 20, a second human body detection unit 30, a control unit 40 including a timer unit 40a, and an illumination load. The lighting fixture 2 and the lighting switch element 50 which lights and extinguishes the lighting fixture 2 are provided. The first human body detection unit 20, the second human body detection unit 30, and the control unit 40 constitute an entrance / exit direction determination unit 60.

  The entrance / exit direction determination unit 60 includes two types of human body detection sensors 20a and 30a that output signal waveforms of two different types of human body detection signals in series along the entrance / exit direction in the vicinity of the entrance / exit of a room (for example, a toilet). A difference in signal waveforms of different types of human body detection signals that are arranged side by side and sequentially detected by the two types of human body detection sensors 20a and 30a is detected, and the entrance / exit direction of the human body is determined.

  As shown in FIG. 4, the control unit 40 includes, for example, a microcomputer 41 and an illumination control unit 42. The microcomputer 41 also has a timer function.

  The control unit 40 controls lighting and extinguishing of the lighting fixture 2 based on the entrance / exit direction of the human body determined by the entrance / exit direction determination unit 60, and two types of human body detection in the entrance / exit direction determination unit 60 Among the sensors 20a and 30a, when the one closer to the entrance is the first human body detection sensor 20a and the rear side from the entrance is the second human body detection sensor 30a, the human body enters the entrance through the entrance, and the first human body detection When the sensor 20a detects a human body and outputs a first human body detection signal, and then the second human body detection sensor 30a detects a human body and outputs a second human body detection signal, a lighting switch The lighting device 2 is turned on with the element turned on, and then the lighting state is locked. Then, when the human body leaves the room, the first human body detection sensor 20a detects the human body again to detect the first human body. Signal When force is to unlock the lighting state by turning off the lighting switch element 50 performs control to turn off the lighting fixture 2.

The AC power supply unit AC receives an AC power supply voltage from a commercial AC power supply, removes a noise component through a power supply line filter, and outputs it.
The DC power supply unit 10 includes first and second power supply circuits 11 and 12.

  The first power supply circuit 11 includes a full-wave rectifier circuit 111 having a diode bridge DB1, and a switching regulator 112 including a switching transformer TF1 and a switching IC 1 (not shown). A power supply voltage obtained by converting the AC power supply voltage from the AC power supply section AC into a direct current using the diode bridge DB1 is acquired as a DC voltage V2 proportional to the turn ratio on the secondary booster coil side of the switching transformer TF1 (not shown). The acquired DC voltage V2 (for example, 15V) is supplied to the illumination control unit 42 in the control unit 40 through the power output terminals T0 and T2. Further, a DC voltage V1 is obtained on the secondary low voltage coil side of the switching transformer TF1, and is supplied as an input power supply voltage to the second power supply circuit 12 in the next stage.

  The second power supply circuit 12 includes a regulator 121 and capacitors C1 and C2 connected to the input / output sides thereof. From the power output terminals T1 and T2 of the second power supply circuit 12, it is used as the 3V power supply voltage of the first detection unit 20, the second detection unit 30, and the control unit 40.

  The lighting device 2 is supplied with an AC power supply voltage from the AC power supply unit AC via a switch element 50 such as a triac TRAC. The lighting switch element 50 is turned on / off when a control voltage is applied to the gate of the TRIAC TRAC from the lighting control unit 42 (see FIG. 4), and controls the lighting fixture 2 to be turned on / off.

  When the triac TRAC is configured by the lighting switch element 50 (see FIG. 4), the illumination control unit 42 controls the gate of the triac TRAC with a photocoupler (not shown) that conducts at zero cross. The photocoupler is controlled by turning on / off a transistor Q1 (not shown) controlled by the microcomputer 41.

The first human body detection unit 20 includes a light emitting unit 21 and a light receiving unit 22.
The light emitting unit 21 radiates, for example, near infrared rays, and includes a variable resistor VR that can variably adjust the DC power supply voltage, a plurality (two in the figure) of infrared light emitting diodes D1 and D2 connected in series, Two infrared light emitting diodes D1 and D2 are provided with a transistor Q2 having collector-emitter paths connected in series. The transistor Q2 controls the infrared light emitting diodes D1 and D2 to emit an infrared signal modulated at about 40 kHz for a certain period t with a certain period T. The on / off switching of the transistor Q2 is performed by supplying a control signal from the microcomputer 41 to the base of the transistor Q2.

  The light receiving unit 22 is for receiving near infrared rays radiated from the light emitting unit 21 and reflected by the human body, and includes a plurality (two in the figure) of infrared receivers RV1 and RV2 and the two infrared receiving units. And an AND gate unit 221 that calculates the logical product of the two outputs from the RV1 and RV2 units and outputs the logical product to the input terminal of the microcomputer 41. FIG. 5 shows a circuit diagram of an embodiment of the light receiving unit 22. The AND gate unit 221 includes two NOR gates that receive the two outputs from the two infrared receivers RV1 and RV2, respectively, and one AND gate that receives the two outputs from the two NOR gates. It is configured.

  The second human body detection unit 30 includes a pyroelectric human sensor 30a that detects a human body and an amplification unit 31 that amplifies the output of the pyroelectric human sensor 30a. The pyroelectric human sensor 30a is a pyroelectric infrared sensor, and detects a temperature change based on infrared rays from a human body as a voltage. The amplification unit 31 is configured by cascading two amplification units 311 and 312 that perform two-stage amplification. The amplifying units 311 and 312 are each configured by an amplifying circuit using an operational amplifier.

The operation of the above configuration will be described with reference to FIGS.
There are two methods of light emission and light reception of the infrared transmission / reception sensor. In the first method, the light reception waveform of FIG. 10 is acquired as a detection signal waveform with respect to the periodic light emission waveform of FIG. The light irradiated periodically from the ceiling is irradiated with an intensity that does not reach the floor surface, and the infrared light reflected around the head of the moving person is reflected by the light receiving unit 22 of the sensor unit 1a. This is a system that receives light. Another second method is to acquire a light reception waveform of floor surface reflection as shown in FIG. 13 or a light reception waveform of human body reflection as shown in FIG. 14 as a detection signal waveform with respect to a continuous light emission waveform. As shown in FIG. 12 (a), near infrared rays emitted from the light emitting unit 21 of the sensor unit 1a on the ceiling are reflected by the light receiving unit 22 of the sensor unit 1a when light is reflected by the floor surface. As shown in b), when a person passes, infrared light reflected around the person's head is received by the light receiving unit 22.

6 to 10 correspond to the first method among the transmission / reception methods of the infrared transmission / reception sensor.
As shown in FIG. 6, an infrared transmission / reception type first human body detection unit 20 converts an infrared signal modulated at about 40 kHz by a plurality of infrared light-emitting diodes D1 and D2 serving as a light-emitting unit 21 at a fixed period T and a fixed period t. 2 emits light to the detection area I and receives and detects reflected waves from the human body (not shown) by the two infrared receivers RV1 and RV2 constituting the light receiving unit 22. The detected two infrared reflected wave outputs are applied to the AND gate unit 221, and only the reflected wave output for which the logical product is established is acquired and supplied to the input terminal of the microcomputer 41. With the circuit configuration shown in FIG. 5, the SN ratio can be improved except for unnecessary reflected waves.

  7 is a bottom view showing a sensor unit including a first human body detection unit using the infrared transmission / reception sensor of FIG. 4 and a second human body detection unit using a pyroelectric human sensor, and FIG. FIG. In these drawings, reference numeral 3 is a partition wall made of rubber or the like, 4 is a light receiving lens, 5 is a visible light cut filter, 6 is a lens cover, and 7 is a sensor cover.

  Infrared light emitting diodes D1 and D2 have a partition wall 3 made of rubber or the like as shown in FIGS. 7 and 8, so that the infrared signals emitted from the infrared light emitting diodes D1 and D2 do not directly enter the infrared light receivers RV1 and RV2. The partition wall 3 is in close contact with the visible light cut filter 5. Infrared rays pass through the visible light cut filter 5 and are radiated to the detection area I, and infrared rays reflected by the human body pass through the filter 5 and are received by the two infrared receivers RV1 and RV2. The received infrared light passes through the AND gate unit 221, and the signal waveform shown in FIG. 10 is input to one input terminal of the microcomputer 41.

  A sensor unit cover 7 including a polyethylene lens cover 6 and a visible light cut filter 5 through which infrared rays can pass to protect the light receiving lens 4 of the pyroelectric human sensor 30a. Covered.

  On the other hand, the second human body detection unit 30 disposed close to the first human body detection unit 20 and behind the room entrance direction uses the pyroelectric human sensor 30a, and passes through the light receiving lens 4. Far infrared rays emitted from the human body passing through the detection area P (see FIGS. 2 and 8) are received, and the output is amplified by a two-stage amplifier circuit and input to the AD conversion terminal of the microcomputer 41.

  FIG. 9 is a diagram showing a signal waveform output from the second human body detection unit 30 by the pyroelectric human sensor. FIG. 10 is a diagram illustrating a signal waveform output from the first human body detection unit 20 by the infrared transmission / reception sensor. However, the scale of the time axis (horizontal axis) of the waveform diagram of FIG. 10 is five times larger than the waveform diagrams of FIGS.

  Thus, the signal waveform output from the second human body detection unit 30 shown in FIG. 9 and the signal waveform output from the first human body detection unit 20 shown in FIG. 10 have different signal waveforms. And distinguishing between the first human body detection signal and the second human body detection signal by comparing the difference between the two signal waveforms from the comparison of the change states (change characteristics) of a plurality of sampling points over a certain period of each waveform. Is possible. Alternatively, the first human body detection signal and the second human body detection signal are integrated with a signal waveform within a predetermined period, so that the first human body detection signal and the second human body detection signal are different from each other in the integration value between the two human body detection signals. It is also possible to distinguish between the two human body detection signals.

  Next, the microcomputer 41 inputs a signal waveform output from the first human body detection unit 20 by the infrared transmission / reception sensor and a signal waveform output from the second human body detection unit 30 by the pyroelectric human sensor. An operation for detecting the moving direction of the entrance / exit of the human body from the two different signal waveforms and controlling the lighting and extinguishing of the lighting fixture 2 based on the detection result will be described.

  The control unit 40 including the microcomputer 41 is a control unit that turns on and off the lighting fixture 2 using the first and second human body detection signals. When a person enters the toilet from the entrance, the first human body When the detection unit 20 detects a human body and outputs a first human body detection signal, and then the second human body detection unit 30 detects a human body and outputs a second human body detection signal, the first human body detection signal is output. The lighting fixture 2 is turned on based on the human body detection signal to turn on the lighting fixture 2, and the lighting status of the lighting fixture 2 is locked and maintained on the basis of the second human body detection signal, after which the person leaves the room. When the first human body detection unit 20 detects the human body again and outputs the first human body detection signal by moving in the direction of the doorway, the lighting device 2 is unlocked. Then, the lighting fixture 2 is turned off.

  Note that “lighted state lock” holds (fixes) the switch element 50 by a control signal from the microcomputer 41, and “lighted state lock release” means that the switch element 50 is turned on by a control signal from the microcomputer 41. Means to switch off and hold (fix).

  On the other hand, as a special example, there is a case where the second human body detection signal cannot be received within a predetermined time even if the first human body detection signal is received. Such an event is a so-called U-turn event and does not occur.

  Therefore, the control unit 40 instructs the lighting fixture 2 to turn on when only the first human body detection unit 20 detects the human body at least twice, for example, when a person enters the toilet from the entrance and turns back immediately. At the same time, the timer unit 40a for driving the timing to turn off the luminaire 2 is driven, and the luminaire 2 is turned off when the timer unit 40a times out.

  The microcomputer 41 can detect the entrance / exit direction of the human body by determining which of the two input signals having different signal waveforms has been received first.

  Now, if the output of the first human body detection unit 20 using the infrared transmission / reception sensor is A and the output of the second human body detection unit 30 using the pyroelectric human sensor is B, the detection time difference is taken into consideration. In the form of “first → back”, if the combination of A → B is an entrance signal and the combination of B → A is an exit signal, the control unit 40 including the microcomputer 41 has a room- It is possible to turn on the illumination and turn it off by B → A. However, if the user stays still without moving for a long time only by detecting the time of entering the room and turning on the lighting fixture 2, the second human body detection unit 30 using the pyroelectric human sensor is used. There is a possibility that the output B cannot be obtained and the lighting fixture 2 is turned off. That is, there is a problem that after the lighting fixture 2 is turned on once, the lighting state cannot be maintained until the user leaves, but the control operation of the control unit 40 in the above-described embodiment of the present invention (the lighting after turning on when entering the room) If the state is locked and the lighting locked state is released when the user leaves the room, the problem can be solved.

  In care facilities, care recipients often use toilets with the help of caregivers. In this case, the caregiver temporarily goes out of the toilet while the care recipient is using his / her work. After completing the add-on, enter the room again and leave together. In such a case, once the caregiver leaves, there is an inconvenience that the lighting fixture 2 is turned off. In order to solve this problem, the switch 43 is connected to the microcomputer 41 shown in FIG. 4 and the lighting apparatus 2 is turned off after a situation where the switch 43 is turned on and off causes a situation where the user enters and leaves the room twice. Can be considered. In order to deal with these special cases, the switch 43 cannot be dealt with simply by turning it on and off, so it is possible to use a dip switch or the like so that selection corresponding to a large number of cases is possible. Easy.

11 to 14 correspond to the second method of the transmission / reception methods of the infrared transmission / reception sensor.
FIG. 11 shows a circuit diagram of another embodiment of the light receiving unit 22 in the first human body detection unit using the infrared transmission / reception sensor. The embodiment shown in FIG. 11 provides a configuration example different from the embodiment shown in FIG. 5 of the light receiving unit 22 in the first human body detection unit 20. FIG. 12 is a diagram illustrating human body detection by an infrared transmission / reception sensor.

  However, the light emitting unit 21 in the first human body detection unit 20 employs a circuit (not shown) that generates the following continuous wave infrared signal. The light emitting unit 21 modulates the infrared light emitting diode D3 to about 40 kHz so as to reach the floor of the toilet by increasing the infrared radiation level from the infrared light emitting diode D3 (not shown) of the sensor unit 1a attached to the ceiling of the toilet. It is driven by a Darlington-connected transistor circuit. In this case, the infrared signal as the infrared light emission output is a continuous wave unlike the embodiment of FIG.

  The light receiving unit 22 shown in FIG. 11 includes a current / voltage conversion circuit IV that converts a light reception current of a photodiode D as a light receiving element into a voltage, and two-stage amplification units AP1 and AP2 that amplify the converted voltage. Is provided.

  In FIG. 11, as shown in FIG. 12A, the infrared rays that reach the floor surface are reflected and enter the photodiode D. A photocurrent corresponding to the amount of light flows from the photodiode D that receives the reflected infrared light, and the current is converted into a voltage by the current / voltage conversion circuit IV using the operational amplifier OP1 in the first stage. The converted voltage is amplified by two-stage amplifier circuits AP1 and AP2 using operational amplifiers OP2 and OP3. Therefore, when there is no person, the output of the light receiving unit 22 is a reflected output from the floor or wall and maintains a constant level. Therefore, the output of the light receiving unit 22 in FIG. 11 hardly changes as shown in FIG. Output.

When the person enters the toilet, when passing through the infrared region I emitted from the infrared light emitting diode D3 (not shown), the light is reflected from the human body and reflected by the photodiode D as shown in FIG. However, since the reflection from the human body is closer to the infrared light emitting diode D3 than the reflection output from the floor (see FIG. 13), the reflection level is large and the final output varies greatly. In this state, as shown in FIG. 14, a change in output occurs.
This reflected output is supplied to the AD conversion terminal of the microcomputer 41, and the human body can be detected by utilizing the fact that the AD conversion value in the microcomputer 41 is larger than the reference value.

  11 to 14 illustrate an embodiment of the second method among the transmission / reception methods of the infrared transmission / reception type sensor of the first detection unit. The infrared transmission / reception type sensor of the first detection unit 20 is described below. Even if the transmission / reception method is the first method or the second method, the light reception waveform (detection waveform) in the pyroelectric human sensor of the second detection unit 30 is the same as the waveform shown in FIG. Of course.

  Thus, the signal waveform output from the second human body detection unit 30 shown in FIG. 9 and the signal waveform output from the first human body detection unit 20 shown in FIG. 14 have different signal waveforms. And distinguishing between the first human body detection signal and the second human body detection signal by comparing the difference between the two signal waveforms from the comparison of the change states (change characteristics) of a plurality of sampling points over a certain period of each waveform. Is possible. Alternatively, the first human body detection signal and the second human body detection signal are integrated with a signal waveform within a predetermined period, so that the first human body detection signal and the second human body detection signal are different from each other in the integration value between the two human body detection signals. It is also possible to distinguish between the two human body detection signals.

According to the embodiment of the present invention described above, whether a person enters or leaves a room by sequentially detecting the human body with two types of sensors that can output two different signal waveforms arranged in the person's entry direction. Because it is possible to detect the exit of a person in a private room such as a toilet and to manage the presence or absence of a person in the room, it is possible to control the lighting fixtures, especially when a person enters the room, When you are there, you can reliably control the lighting, and when the user leaves the room, you can immediately turn it off, so you can solve the inconvenience of turning off the light while using the conventional toilet, and you can use the toilet comfortably. It can be expected to be effective in realizing energy saving.
In addition to toilets, private rooms include rooms for personal use such as study rooms.

  The infrared transmission / reception sensor 20a corresponds to a so-called active sensor that irradiates a human body or an object with a near-infrared ray at a light emitting unit and reflects the near-infrared ray with a human body or an object at a light receiving unit. The pyroelectric human sensor 30a corresponds to a passive sensor that directly receives far infrared rays emitted from a human body or an object.

  Although one embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. This embodiment and its modifications are included in the scope of the present invention and the gist thereof, and are also included in the invention described in the claims and the equivalent scope thereof.

  DESCRIPTION OF SYMBOLS 1 ... Entrance / exit detection switch, 1a ... Sensor part, 2 ... Lighting fixture, 10 ... Power supply part, 11 ... 1st power supply circuit, 12 ... 2nd power supply circuit, 20 ... 1st human body detection part, 20a ... 1st Human body detection sensor (infrared transmission / reception type sensor, infrared transmission / reception type sensor), 21 ... light emitting part, 22 ... light receiving part, 30 ... second human body detection part, 30a ... second human body detection sensor (pyroelectric human sensor) Sensor, pyroelectric infrared sensor), 40 ... control unit, 40a ... timer unit, 41 ... microcomputer, 42 ... lighting control unit, 50 ... lighting switch element, 60 ... entry / exit direction determination unit.

Claims (5)

  Two types of human body detection sensors that output signal waveforms of two different types of human body detection signals are arranged in series along the entrance / exit direction near the entrance of the room, and are sequentially detected by the two types of human body detection sensors. An entry / exit detection switch comprising an entry / exit direction determination unit that detects a difference in signal waveform of different human body detection signals and determines an entrance / exit direction of a human body. Two types of human body detection sensors that output signal waveforms of two different types of human body detection signals are arranged in series along the entrance / exit direction near the entrance of the room, and are sequentially detected by the two types of human body detection sensors. An entry / exit direction determination unit that detects a difference in signal waveforms of different human body detection signals and determines an entrance / exit direction of the human body;
A control unit for controlling lighting and extinction of the lighting fixture based on the entrance / exit direction of the human body determined by the entrance / exit direction determination unit;
An entry / exit detection switch characterized by comprising: The controller is
Of the two types of human body detection sensors in the entrance / exit direction determination unit, the one close to the entrance / exit is the first human body detection sensor, and the back of the entrance / exit is the second human body detection sensor. Enters from the entrance, the first human body detection sensor detects the human body and outputs the first human body detection signal, and then the second human body detection sensor detects the human body and When the second human body detection signal is output, the lighting switch element is turned on to turn on the lighting fixture, and then the lighting state is locked, and the first time when the human body leaves the room. When the human body detection sensor detects the human body again and outputs the first human body detection signal, the lighting switch element is turned off to unlock the lighting state, and the lighting apparatus is turned off. System Out detection switch according to claim 2, wherein the performing.   When only the first human body detection sensor detects the human body at least twice, the control unit instructs the lighting device to turn on and simultaneously turns on the lighting device, and measures the timing of turning off the lighting device. The exit / entry detection switch according to claim 2, wherein the timer unit is driven and the lighting apparatus is turned off at a timing when the timer unit expires.   The in / out detection switch according to claim 2 or 3, wherein the first human body detection sensor is an infrared transmission / reception type sensor, and the second human body detection sensor is a pyroelectric infrared sensor.

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