JP2021157966A - Lighting device with sensor - Google Patents

Abstract

To provide a lighting device with a sensor that operates with less occurrence of malfunction.SOLUTION: A lighting device with a sensor includes a lighting unit for emitting illumination light, a sensor unit for detecting movement of an object, and a control unit for controlling the lighting unit according to a detection result of the sensor unit. The sensor unit emits microwaves and receives microwaves reflected by the object. The sensor unit can change the transmission intensity of microwaves to be transmitted. The control unit sets the transmission intensity of the microwaves to be transmitted by the sensor unit based on the reception intensity of microwaves received by the sensor unit.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a lighting device with a sensor.

Conventionally, there is known lighting with a microwave sensor that uses a microwave sensor to detect the presence or absence of a person and changes the lighting state of the lighting.

The microwave sensor has advantages such as a wide detection range and less influence on the environment as compared with an infrared sensor which is generally used as a motion sensor.

Japanese Unexamined Patent Publication No. 2012-256510

However, on the other hand, depending on the building member, the detection range of the microwave sensor extends beyond the wall, and the movement of a person beyond the wall may be unnecessarily captured. This causes a malfunction of the lighting with a microwave sensor.

It is desired to develop a lighting device with a sensor that operates with less occurrence of such malfunctions.

The lighting device with a sensor according to the embodiment includes a lighting unit that emits illumination light, a sensor unit that detects the movement of an object, and a control unit that controls the lighting unit according to the detection result of the sensor unit. The sensor unit emits microwaves and receives microwaves reflected by an object. The sensor unit can change the transmission intensity of the transmitted microwave. The control unit sets the transmission intensity of the microwave transmitted by the sensor unit based on the reception intensity of the microwave received by the sensor unit.

According to the embodiment, a lighting device with a sensor that operates with less occurrence of malfunction is provided.

FIG. 1 is a block diagram of a lighting device with a sensor according to an embodiment. FIG. 2 is a graph of the reflectance with respect to the transmission intensity of the microwave transmitted from the sensor unit shown in FIG. FIG. 3 is a plan view showing an installation example of the lighting device with a sensor shown in FIG. 1, and shows a state of microwaves transmitted at a transmission intensity within a range in which the reflectance increases in FIG. .. FIG. 4 is a plan view showing an installation example of the lighting device with a sensor shown in FIG. 1, and shows the state of the microwave transmitted at the transmission intensity at which the reflectance starts to saturate in FIG. FIG. 5 is a plan view showing an installation example of the lighting device with a sensor shown in FIG. 1, and shows a state of microwaves transmitted at a transmission intensity within a range in which the reflectance is saturated in FIG. ..

The lighting device 10 with a sensor of the embodiment includes a lighting unit 20 that emits illumination light, a sensor unit 30 that detects the movement of an object, and a control unit that controls the lighting unit 20 according to the detection result of the sensor unit 30. 40 and. The sensor unit 30 emits microwaves and receives microwaves reflected by an object. The sensor unit 30 can change the transmission intensity of the transmitted microwave. The control unit 40 sets the transmission intensity of the microwave transmitted by the sensor unit 30 based on the reception intensity of the microwave received by the sensor unit 30.

<Configuration of lighting device with sensor>
Hereinafter, embodiments will be described in detail with reference to the drawings. FIG. 1 is a block diagram of a lighting device with a sensor according to an embodiment.

As shown in FIG. 1, the illuminating device 10 with a sensor includes an illuminating unit 20 that emits illuminating light, a sensor unit 30 that detects the movement of an object, and a control unit 40 that controls the illuminating unit 20 and the sensor unit 30. A switch unit 50 that instructs the start of setting the transmission intensity of the microwave is provided.

The illumination unit 20 has a light source 22 that generates illumination light and a power supply 24 that supplies electric power to the light source 22.

The light source 22 is composed of, for example, an LED array. The power supply 24 receives power from the facility power supply and outputs the power supplied to the light source 22. The electric power of the facility power source is an AC voltage, and the electric power supplied to the light source 22 is a DC voltage. For example, the facility power supply supplies an AC voltage of 100 volts, and the power supply 24 converts the AC voltage into a predetermined DC voltage and outputs the AC voltage. The light source 22 receives power from the power supply 24 and emits illumination light. The power supply 24 is turned on / off by the lighting signal Si supplied from the control unit 40.

The sensor unit 30 includes a transmission / reception unit 32 that transmits / receives microwaves and a control unit 34 that controls the transmission / reception unit 32.

The transmitting / receiving unit 32 transmits microwaves and receives microwaves reflected by an object. The transmission / reception unit 32 can change the transmission intensity of the transmitted microwave.

The control unit 34 controls the transmission / reception unit 32. For example, the control unit 34 controls the transmission intensity of the microwave transmitted by the transmission / reception unit 32. The control unit 34 also generates a microwave reception signal received by the transmission / reception unit 32. The received signal includes the microwave reception intensity and the microwave reception frequency.

For example, the control unit 34 controls on / off of the transmission / reception unit 32, that is, transmission / stop of microwaves. Alternatively, the transmission / reception unit 32 may continue to transmit microwaves without the control unit 34 controlling the transmission / stop of microwaves.

For example, the control unit 34 is composed of a hardware circuit including an ASIC (application specific integrated circuit) and the like. Alternatively, the control unit 34 may be composed of a processor and a memory that stores a program that causes the processor to perform the function of the control unit 34.

The control unit 40 supplies electric power Ps to the sensor unit 30 and communicates with the sensor unit 30 by the communication signal Ss. The communication between the control unit 40 and the sensor unit 30 is bidirectional communication. The communication signal Ss includes a set value of the microwave transmission intensity, a specified value of the microwave transmission intensity, a microwave reception intensity, and a signal of the microwave reception frequency. Further, the communication signal Ss may include a signal for instructing the transmission / stop of microwaves.

Further, the control unit 40 supplies the lighting signal Si to the lighting unit 20 for a certain period of time based on the communication signal Ss from the sensor unit 30. While the lighting signal Si is supplied to the illumination unit 20, the power supply 24 is turned on, and the light source 22 emits illumination light.

The control unit 40 supplies power to the control unit 42 that sets the microwave transmission intensity and generates the lighting signal Si, the memory 44 that stores the set value of the microwave transmission intensity, and the control unit 42 and the memory 44. It has a power supply 46 and a power source 46.

The power supply 46 receives power from the facility power supply and outputs power to be supplied to the control unit 42 and the memory 44. The electric power supplied to the control unit 42 and the memory 44 is a DC voltage. For example, the power supply 46 outputs a DC voltage of 5 volts.

The control unit 42 sets the transmission intensity of the microwave based on the reception intensity of the microwave when necessary. Further, the control unit 42 generates a lighting signal Si based on the reception frequency of the microwave.

For example, the control unit 42 is composed of a hardware circuit including an ASIC (application specific integrated circuit) and the like. Alternatively, the control unit 42 may be composed of a processor and a memory that stores a program that causes the processor to perform the function of the control unit 42.

The memory 44 stores the set value of the microwave transmission intensity set by the control unit 42. When necessary, the control unit 42 reads the set value of the microwave transmission intensity from the memory 44 and transmits it to the sensor unit 30.

The switch unit 50 transmits a start signal for setting the microwave transmission intensity to the control unit 40 according to the operation of the installer. The control unit 40 receives the start signal for setting the microwave transmission intensity, enters the setting mode, and starts setting the microwave transmission intensity. For example, the switch unit 50 is composed of a physical switch. Alternatively, the switch unit 50 may be configured by an IR remote controller. Alternatively, the control unit 40 may start setting the microwave transmission intensity when the power is turned on for the first time. In this case, the switch unit 50 may be omitted or may have the switch unit 50.

<Setting of microwave transmission intensity>
The lighting device 10 with a sensor is installed in a building such as a building. 3 to 5 are plan views showing an installation example of the lighting device 10 with a sensor.

In this installation example, as shown in FIGS. 3 to 5, the lighting device 10 with a sensor is installed on the wall of the landing of the staircase where the stairs 84 are placed. The staircase 84 is surrounded by a skeleton 84, a wall 90, and a door 86, and is separated from the passage 82 by the door 86 and the wall 90. For example, the skeleton 84 is made of concrete, the wall 90 is made of wood, and the door 86 is made of metal. The concrete skeleton 84 does not allow microwaves to pass through, but the wooden wall 90 allows microwaves to pass through easily, and the metal door 86 does not allow microwaves to pass through.

Hereinafter, the setting of the microwave transmission intensity will be described with reference to the installation examples of FIGS. 3 to 5.

After the installation of the lighting device 10 with a sensor is completed, the installer confirms that there are no extra objects not included in the building, and then operates the switch unit 50 to instruct the setting of the microwave transmission intensity. do. In response to this, the switch unit 50 transmits a start signal for setting the microwave transmission intensity to the control unit 40.

Upon receiving the start signal, the control unit 40 enters the microwave transmission intensity setting mode and starts setting the microwave transmission intensity. In the setting mode, the control unit 42 generates a signal of a microwave transmission instruction and a specified value of the transmission intensity, and the control unit 40 transmits this to the sensor unit 30. In response to this, in the sensor unit 30, the control unit 34 controls the transmission / reception unit 32 so that the transmission / reception unit 32 transmits microwaves with a transmission intensity of a specified value. Here, the specified value of the transmission intensity is the minimum value of the transmission intensity of the microwave that can be transmitted by the sensor unit 30.

Further, the control unit 42 generates a signal that changes the specified value of the microwave transmission intensity with time from the minimum value to the maximum value, and the control unit 40 transmits this to the sensor unit 30. In response to this, in the sensor unit 30, the control unit 34 controls the transmission / reception unit 32 so that the transmission intensity of the microwave transmitted by the transmission / reception unit 32 changes from the minimum value to the maximum value over time.

Further, the control unit 34 generates a reception signal including the reception intensity of the microwave received by the transmission / reception unit 32, and the sensor unit 30 transmits this to the control unit 40.

The control unit 40 calculates the reflectance based on the specified value of the microwave transmission intensity and the reception intensity of the microwave included in the reception signal. Here, the reflectance is the ratio of the microwave reception intensity to the microwave transmission intensity. That is, assuming that the transmission intensity of _{the microwave is I out} and the reception intensity of the microwave is I _in , the reflectance is expressed by _{I in} / I _out.

FIG. 2 is a graph of the reflectance with respect to the transmission intensity of the microwave transmitted from the sensor unit 30. As shown in FIG. 2, the reflectance increases at first as the transmission intensity increases, but becomes constant from the middle. Hereinafter, being constant is referred to as saturation for convenience. In other words, when the change in reflectance with respect to the change in transmission intensity is less than a predetermined value, the ratio of reflectance is said to be saturated. As the reflectance data obtained from the data of the transmission intensity and the reflection intensity thereof, the average value of the results of a plurality of measurements may be used.

FIG. 3 shows the state of the microwave transmitted at the _{transmission intensity, for example, I 1} , which is within the range where the reflectance increases. In the state shown in FIG. 3, the range of microwaves is limited to the vicinity of the sensor-equipped lighting device 10. Therefore, the range in which the presence / absence of a person or the movement of an object can be detected using microwaves (detection range by microwaves) is considerably narrow. This causes a malfunction, for example, that the lighting device 10 with a sensor does not light even though a person has invaded the stairs 84.

5, the reflectance indicates the state of microwaves transmitted in the outgoing intensities example I ₃ is in the range saturated. In the state shown in FIG. 5, the microwave reach extends beyond the wall 90 and the door 86 and across the passage 82. Therefore, the range in which the presence / absence of a person or the movement of an object can be detected using microwaves is considerably wide. This causes a malfunction such as erroneously detecting a person passing through the passage 82 and turning on the lighting device 10 with a sensor even though the person has not invaded the stairs 84.

FIG. 4 shows the state of the microwave transmitted at the _{transmission intensity I 2} at which the reflectance begins to saturate. In the state shown in FIG. 4, the range of microwaves extends beyond the wall 90 and the door 86, but the metal door 86 is difficult for microwaves to pass through, and when the door 86 is closed, the passage 82 There is little protrusion to the door. Therefore, it can be said that the range in which the presence / absence of a person or the movement of an object can be detected using microwaves is not too wide and not too narrow, and is an appropriate range. For example, a person who has invaded the stairs 84 is surely detected, but a person who passes through the passage 82 is hardly detected. It can be said that the transmission intensity of the microwave at this time is appropriate.

Based on the above situation, the control unit 40 sets the transmission intensity I _{2 at} which the reflectance starts to saturate to the transmission intensity of the microwave of the sensor unit 30. The control unit 40 also stores the set value of the transmission intensity in the memory 44. The transmission intensity to be set does not have to be the transmission intensity I ₂ at which the reflectance starts to saturate strictly, and may be a value within an allowable range near the _{transmission intensity I 2.} After setting the transmission intensity of the microwave, the sensor unit 30 transmits the microwave with the transmission intensity of the set value under the control of the control unit 40.

<Monitoring operation and lighting control>
After that, the lighting device 10 with a sensor enters a normal operation, that is, a monitoring operation by the sensor unit 30 and lighting control of the lighting unit 20.

Under the control of the control unit 40, the sensor unit 30 transmits microwaves with the transmission intensity of the set value set as described above.

For example, the control unit 40 controls the sensor unit 30 so that the sensor unit 30 always emits microwaves.

Alternatively, the control unit 40 may control the sensor unit 30 so that the sensor unit 30 intermittently transmits microwaves. In this case, for example, the control unit 40 transmits a communication signal Ss including an instruction signal for transmitting the microwave for 2 seconds and then stopping the microwave for 1 second to the sensor unit 30. For example, the instruction signal may be a repetition of a transmission stop signal after 2 seconds and a transmission stop signal after 1 second, following the first transmission signal of the microwave. In response to this, in the sensor unit 30, the control unit 34 repeats the operation of turning on the transmitting / receiving unit 32 for 2 seconds and then turning it off for 1 second. In such an intermittent transmission, the operation of the transmission / reception unit 32 is intermittently stopped, which is effective for power saving, reduces the operating load of the transmission / reception unit 32, and extends the life of the transmission / reception unit 32. It is effective for conversion.

The control unit 34 also transmits the communication signal Ss including the reception frequency of the microwave received by the transmission / reception unit 32 to the control unit 40. In the control unit 40, the control unit 42 monitors the reception frequency of microwaves.

As long as there is no intrusion of a person into the stairs 84 or the opening and closing of the door 86, the microwave reception frequency is almost constant, although there are some fluctuations and fluctuations. Hereinafter, this slight fluctuation or fluctuation will be referred to as a fluctuation or fluctuation when the light is turned off for convenience. On the other hand, when a person invades the stairs 84 or the door 86 is opened or closed, the microwave reception frequency changes greatly beyond the fluctuation or fluctuation range when the light is turned off due to the Doppler effect.

The control unit 40 stores in the memory 44 the reception frequency of microwaves when a person does not enter the stairs 84 or the door 86 is not opened or closed. The microwave reception frequency at this time is referred to as a microwave reference reception frequency for convenience. For example, the control unit 42 stores the reference reception frequency of microwaves in the memory 44 when the lighting device 10 with a sensor is installed. Further, the control unit 42 may update the reference reception frequency of the microwave stored in the memory 44 as appropriate when the illumination unit 20 is turned off.

The control unit 42 calculates the difference between the reception frequency of the microwave transmitted from the sensor unit 30 and the reference reception frequency of the microwave stored in the memory 44. The control unit 42 also determines whether or not this difference is larger than a predetermined threshold value that is larger than the fluctuation or fluctuation range when the light is turned off.

When the difference is smaller than the threshold value, the control unit 42 maintains the operation so far.

On the contrary, when the difference is larger than the threshold value, the control unit 42 generates a lighting signal Si for a certain period of time, and the control unit 40 supplies this to the illumination unit 20. While the lighting signal Si is supplied to the illumination unit 20, the power supply 24 is turned on, and the light source 22 emits illumination light. That is, the control unit 40 controls the lighting unit 20 so that the lighting unit 20 lights up for a certain period of time.

It can be said that this is an operation in which the sensor unit 30 detects the movement of a person, the door 86, or the like, and the control unit 40 turns on the lighting unit 20 in response to the movement. If the sensor unit 30 detects the movement of a person, the door 86, or the like again while the lighting unit 20 is lit for a certain period of time, the lighting unit 20 is lit for a certain period of time each time. Will be done.

As described above, the transmission intensity of microwaves is set so that the range in which the presence / absence of a person or the movement of an object can be detected using microwaves is an appropriate range. Therefore, the lighting device 10 with a sensor operates with less occurrence of malfunction.

In addition to this, the control unit 40 may control the sensor unit 30 so as to temporarily stop the transmission of microwaves by the sensor unit 30 while the illumination unit 20 is lit. For example, the control unit 42 delays the start of supply of the lighting signal Si, stops the transmission of microwaves, and generates an instruction signal for transmitting microwaves again after a lapse of a predetermined time. For example, the instruction signal may be a microwave transmission stop signal and a microwave transmission signal after a predetermined time thereof. The control unit 40 transmits a communication signal Ss including this instruction signal to the sensor unit 30.

In response to this, in the sensor unit 30, the control unit 34 stops the transmission / reception unit 32 from transmitting microwaves for a predetermined time, and then the transmission / reception unit 32 transmits microwaves again with the transmission intensity of the set value. The transmission / reception unit 32 is controlled so as to do so.

The total of the time until the microwave transmission is stopped after the start of supply of the lighting signal Si and the time until the microwave is transmitted again is larger than the time while the illumination unit 20 is lit. short. This is to avoid turning off the light even momentarily when the person continues to exist within the detection range of the microwave.

If the microwave transmission is resumed after a certain period of time in which the lighting unit 20 is lit, the lighting unit 20 is turned on immediately after that, but the lighting unit 20 is turned off for a moment. .. This is not a preferable operation of the lighting device 10 with a sensor.

In this way, stopping the transmission of microwaves by the sensor unit 30 while the lighting unit 20 is lit interrupts the operation of the transmission / reception unit 32, so that the sensor unit 30 moves a person or the like. Compared with the configuration in which microwaves are continuously transmitted even after the detection of the above, it contributes to power saving, reduces the operating load of the transmitting / receiving unit 32, and extends the life of the transmitting / receiving unit 32.

Further, as compared with the configuration in which the sensor unit 30 constantly emits microwaves after the installation of the lighting device 10 with a sensor, it greatly contributes to reducing the operating load of the transmitting / receiving unit 32 and extending the life of the transmitting / receiving unit 32.

As described above, the lighting device 10 with a sensor of the embodiment operates with less occurrence of malfunction because the transmission intensity of the microwave is set so that the detection range by the microwave becomes an appropriate range.

Although embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. The embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. The embodiments are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and the equivalent scope thereof.

For example, in the above-described embodiment, the control unit 42 in the control unit 40 calculates the reflectance, but the present invention is not limited to this, and the control unit 34 in the sensor unit 30 calculates the reflectance. May be good.

Further, regarding the suspension of microwave transmission of the sensor unit 30 while the lighting unit 20 is lit, the control unit 40 instructs the timing of stopping and restarting the microwave transmission, but the control unit 40 is configured to instruct the timing of stopping and resuming the microwave transmission. The sensor unit 30 may be configured to instruct only the timing of stopping the transmission of the microwave and resume the transmission of the microwave after the elapse of a predetermined time. This is carried out by changing the division of processing that the control unit 42 and the control unit 34 are in charge of.

10 ... Lighting device with sensor, 20 ... Lighting unit, 22 ... Light source, 24 ... Power supply, 30 ... Sensor unit, 32 ... Transmission / reception unit, 34 ... Control unit, 40 ... Control unit, 42 ... Control unit, 44 ... Memory, 46 ... power supply, 50 ... switch section, 82 ... passage, 84 ... stairs, 86 ... door, 88 ... wall, 90 ... wall.

Claims (3)

With an illumination unit that emits illumination light;
With a sensor that detects the movement of an object;
With a control unit that controls the lighting unit according to the detection result of the sensor unit;
It is a lighting device with a sensor equipped with
The sensor unit can transmit microwaves, receive microwaves reflected by an object, and change the transmission intensity of the transmitted microwaves.
The control unit is a lighting device with a sensor that sets the transmission intensity of microwaves transmitted by the sensor unit based on the reception intensity of microwaves received by the sensor unit. The control unit changes the transmission intensity of the microwave transmitted by the sensor unit, calculates the ratio of the reception intensity of the microwave to the transmission intensity of the microwave, and when the ratio starts to saturate, the sensor unit starts to saturate. The lighting device with a sensor according to claim 1, wherein the transmission intensity of the transmitted microwave is set to the transmission intensity of the microwave transmitted by the sensor unit. The control unit controls the lighting unit so that the lighting unit lights up for a certain period of time according to the detection result of the sensor unit, and the sensor unit emits microwaves during the fixed time period. The lighting device with a sensor according to claim 1 or 2, which controls the sensor unit so as to temporarily stop.

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