JPH11162656A - Lighting equipment - Google Patents

Abstract

(57) [Problem] To provide a lighting device that prolongs the battery life of an internal power supply of a transmitter, suppresses unnecessary lighting of a lighting load, and saves energy. SOLUTION: When a human body is detected, a human body detection unit 11 which outputs a human body detection signal, and when a human body detection signal is received, an output signal is transmitted from a transmission unit 13 and the output signal is transmitted, and then the human body detection signal is again transmitted within a retrigger time. , A transmitter C having a control unit 12 for transmitting an output signal from the transmission unit again after a retrigger time has elapsed, and a reception unit 15 for receiving the output signal and a lighting holding time based on the output signal received by the reception unit. And a lighting device D including a load control unit 17 that turns on the illumination load 18. In the lighting device, the control unit has a mask time of a predetermined time after transmitting the output signal within the retrigger time. In addition, based on the detection of the human body within the mask time, the output signal is not transmitted from the transmission unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device having a transmitter having a human body sensor and a lighting device for turning on and off a load based on a signal from the transmitter.

[0002]

2. Description of the Related Art A conventional lighting device will be described with reference to FIGS. FIG. 10 is a block diagram illustrating a configuration of a lighting device. FIG. 11 is a time chart showing the relationship between the human body detection signal, the output signal, and the lighting state of the load.

[0003] In FIG. 10, the lighting device includes a transmitter A and a lighting fixture B. The transmitter A detects a human body in the detection area and outputs a human body detection signal S1. When the human body detection signal S1 is received from the human body detection unit 1, the transmitter A transmits the output signal S2 from the transmission unit 3. And a control unit 2. The transmitter A is operated by an internal power supply 4 such as a battery.

The lighting fixture B includes a receiving unit 5 for receiving the output signal S2, and a load control signal S3 for lighting the lighting load 8 for a predetermined lighting holding time T1 based on the output signal S2 received by the receiving unit 5. Lighting control unit 6 that outputs
And a load control unit 7 that receives power from the power supply unit 9 and turns on the illumination load 8 based on the load control signal S3. Also, the lighting fixture control unit 6 includes a lighting load 8.
When the output signal S2 is received again during the lighting of, the load control signal S3 for lighting the illumination load 8 for the lighting holding time T1 is output again from that point.

[0005] Incidentally, the transmitter A has an internal power source 4.
For example, if the frequent signal transmission such as transmitting the output signal S2 every time the human body detection signal S1 is output is performed, the battery life of the internal power supply 4 is shortened. Therefore, the control unit 2 does not transmit the output signal S2 from the transmission unit immediately after receiving the human body detection signal S1 except when the human body is detected first,
As shown in FIG. 11, when the human body detection signal S1 is received again within a predetermined retrigger time T2 after receiving the human body detection signal S1, the output signal S2 is again output after the retrigger time T2 has elapsed.
Is transmitted from the transmission unit 3 to reduce the number of signal transmissions.

[0006]

However, in the lighting device shown in FIG. 10 as described above, the human body detecting unit 1
Since the human body detection sensor detects a human body with a plurality of detection beams, when a human crosses the detection area, the human body detection unit 1 outputs the human body detection signal S1 a plurality of times. Therefore, as shown in FIG.
Assuming that the human body has crossed the detection area during the period before, the human body detection signal S1 is also generated within the second retrigger time T2 from the time T5 to the time T6 although the lighting of the output signal S2 for two times is sufficient. Is output, the third output signal S2 is transmitted after the end of the second retrigger time T2. The third output signal S2 is an unnecessary signal from the viewpoint of turning on the illumination load 8 during the movement of the human body, since the human body has already completely passed through the detection area.

Therefore, the transmitter has a problem that the unnecessary signal is transmitted to shorten the battery life of the internal power supply 4 and that the illumination load 8 is turned on for an unnecessarily long time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to prolong the battery life of an internal power supply of a transmitter and to suppress unnecessary lighting of a lighting load. To provide a lighting device that can save energy.

[0009]

According to the present invention, in order to solve the above-mentioned problems, according to the first aspect of the present invention, a human body detection signal which outputs a human body detection signal when the presence of a human body in a detection area is detected. And, when the human body detection signal is received, the output signal is transmitted from the transmission unit, and when the human body detection signal is received again within a predetermined retrigger time after transmitting the output signal, the output signal is transmitted again after the retrigger time has elapsed. A transmitter including a control unit configured to transmit from the transmission unit; a reception unit configured to receive the output signal; and a load configured to light an illumination load for a predetermined lighting holding time based on the output signal received by the reception unit. A lighting unit having a control unit, and a lighting device installed separately from the transmitter, wherein the control unit transmits the output signal within the retrigger time. Has a mask time of a predetermined time, based on the human body detection in the mask time is characterized in that it has decided not to transmit the output signal from the transmitter.

In the invention according to claim 2, the mask time is set to be long when the detection area of the human body detecting section is wide, and is set to be short when the detection area is small. It is assumed that.

According to the third aspect of the present invention, the detection area is formed in a substantially rectangular shape having a longitudinal direction and a lateral direction, and the mask time is determined when the human body crosses the human body detection area in the longitudinal direction. 2. The lighting device according to claim 1, wherein the lighting device is set to be long, and is set short when it crosses in the short direction.

In the invention according to claim 4, the mask time is set long when the transmitter is provided in a moving space in which the human body moves in a substantially constant direction, so that the human body is fixed. In the case of being provided in a stay space that does not move in the direction, the length is set to be short.

According to a fifth aspect of the present invention, the length of the mask time is changed according to the time of human body detection.

According to a sixth aspect of the present invention, the mask time is set short when the retrigger time is short, and set long when the retrigger time is long. .

In the invention according to claim 7, the mask time is set long when the number of human body detection signals input per unit time is large, and the human body detection signal input per unit time is set. When the number is small, it is set to be short.

In the invention according to claim 8, the mask time is set longer if the battery capacity of the internal power supply for supplying the transmitter is small, and the mask time is increased if the battery capacity of the internal power supply for supplying the transmitter is large. The lighting device according to claim 1, wherein the lighting device is set to be shorter.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 is a block diagram showing a configuration of a lighting device. FIG. 2 is a conceptual diagram showing a relationship between a detection beam and a human body detection signal. FIG. 3 is a time chart showing the relationship between the human body detection signal, the output signal, and the lighting state of the load. FIG. 4 is an explanatory diagram showing the relationship between the viewing angle of the human body detection sensor and the size of the detection area. FIG. 5 is an explanatory diagram showing the relationship between the viewing angle of the human body detection sensor and the size of the detection area.

Referring to FIG. 1, the lighting apparatus includes a transmitter C and a lighting fixture D. The transmitter C detects a human body in the detection area and outputs a human body detection signal S4, and a human body detection signal S4 from the human body detection unit 11.
And a control unit 12 for transmitting the output signal S5 wirelessly from the transmission unit 13 upon receipt of the control signal. The transmitter C is operated by an internal power supply 14 such as a battery.

More specifically, the human body detection unit 11 includes an infrared human body detection sensor 11a having a plurality of detection beams G and detecting movement of a human body, an amplification unit 11b for amplifying an output voltage of the infrared human body detection sensor 11a, and an amplification unit. A comparator 11c that compares the amplified amplifier output value of 11b with a predetermined threshold value and outputs a human body detection signal S4 when the amplifier output value exceeds the predetermined threshold value. I have. Then, as shown in FIG.
Each time the detection beam G of 1a crosses from the point A to the point B, an amplifier output value exceeding a substantially threshold value is input to the comparison unit 11c.
c outputs a plurality of human body detection signals S4.

The control section 12 has a timer section 12a. When a human body is first detected, the control section 12 transmits an output signal S5 from the transmission section 13, and within a predetermined retrigger time T7 from the transmission of the output signal S5. Again the human body detection signal S
When receiving the signal 4, the output signal S5 is transmitted again from the transmission unit 3 after the retrigger time T7 has elapsed, and the operation is repeated. Further, the control unit 12 sets a predetermined mask time T from the transmission of the output signal S5 even within the retrigger time T7.
The human body detection signal S4 input before the lapse of eight hours is treated as not having been input. That is, even if the human body detection signal S4 is input only before the predetermined mask time T8 elapses from the transmission of the output signal S5, the control unit 12 outputs the output signal S4.
5 is not transmitted to the transmission unit 13.

The mask time T8 is determined based on the detection area of the infrared human body detection sensor 11a. For example, as shown in FIG. 4, the viewing angle of the infrared human body detection sensor 11a is 120 degrees and the width of the detection area is 1 In the case of .15 [m], assuming that the human walking speed is 0.5 [m / s],
It takes about 2.3 seconds to cross. Therefore, in this case, the mask time T8 is set to 3 seconds. Also,
For example, as shown in FIG.
Has a viewing angle of 140 degrees and a detection area width of 5.5.
In the case of [m], it takes about 11 hours for a human to cross the detection area.
Since it takes seconds, the mask time T8 is set to 11 seconds. The mask time may be predetermined in the transmitter C, or may be arbitrarily set by the user using a setting switch. However, the mask time must be shorter than the retrigger time.

The lighting fixture D has a receiving section 6 for receiving the output signal S5, and a load control signal S6 for lighting the lighting load 18 for a predetermined lighting holding time T14 based on the output signal S5 received by the receiving section 6. A load control unit 16 that receives power from a power supply unit 19 and turns on a lighting load 18 based on a load control signal S6;
Is configured. In addition, the lighting fixture control unit 16
Receives the output signal S5 again during the lighting of the lighting load 18, and outputs the load control signal S6 for lighting the lighting load 18 for the lighting holding time T14 again from that point.

Next, the operation of the illuminating device configured as described above will be described. First, as shown in FIG. 3, if a human crosses the detection area from time T9 to time T10, the human body detection unit 11 outputs a human body detection signal S4, and the control unit 12 sends the first output signal S5 to the transmission unit 13 To be sent. Then, the human body detection signal S4 is further input to the control unit 12 within the retrigger time T7 from the transmission time, and the human body detection signal S4 is controlled even after the mask time T8 has elapsed (between time T11 and time T12). The control unit 12 causes the transmission unit 13 to transmit the output signal S5 because the signal has been input to the unit 12. Then, from the time of the transmission, the next retrigger time T
7, the human body detection signal S4 is input to the control unit 12, but before the mask time T8 elapses (before the time T13), the human body detection signal S4 is input to the control unit 12 even if the mask time T8 is not input. The human body detection signal S4 received at step S12 is treated as not having been input. Since the human body detection signal S4 has not been input to the control unit 12 after the mask time T8 has elapsed (after time T13 has elapsed), the control unit 12 Is the transmission unit 1
3 does not output the output signal S5.

Therefore, the third output signal S5 shown by the broken line in FIG. 3 is not transmitted, and thus the power consumption required for transmission is reduced, so that the internal power supply 14 of the transmitter C can be reduced.
Can be extended, and unnecessary transmission of the output signal S5 can be eliminated, so that unnecessary lighting of the illumination load 18 can be eliminated and energy saving can be achieved.

[Second Embodiment] FIG. 6 is a plan view showing the shape of a detecting element of an infrared human body detecting sensor. FIG. 7 is an explanatory diagram showing the relationship between the direction in which a person crosses the detection area and the amplifier output value.

In the second embodiment, a detailed description of the same portions as those of the lighting device described in the first embodiment will be omitted. The lighting system of the second embodiment is different from the lighting system of the first embodiment described above in that it has the following features.

That is, the detection element shape of the infrared human body detection sensor 11a is rectangular as shown in FIG. 6, and the detection area is rectangular accordingly. The control unit 12 sets the mask time T8 according to the direction in which the human body crosses the detection area.

More specifically, when the human body crosses the detection area in the longitudinal direction, a large number of detection beams S4 are input to the control unit 12 because a large number of detection beams are crossed.
Sets the mask time T8 longer than usual and sets the output signal S
5 is hardly transmitted. On the other hand, when the human body crosses the detection region in the lateral direction, the human body detection signal S4 input to the control unit 12 is a decimal number, so the control unit 12 sets the mask time T8 to a normal time.

Further, whether the human body has crossed the detection area in the longitudinal direction or in the short direction is determined by the amplifying unit 11b.
This is performed based on the amplifier output value. Generally, an infrared human body detection sensor 1 when a human body crosses the detection area in the longitudinal direction
The amplifier output value obtained by amplifying the output voltage of 1a is smaller than the amplifier output value when the human body crosses the detection region in the lateral direction. Therefore, the control unit 12 compares the amplifier output value with a predetermined reference value, and determines that the human body is crossing the detection area in the short side direction if the amplifier output value is larger than the reference value, and determines the amplifier output value g. If it is smaller than the reference value, it is determined that the human body has crossed the detection area in the longitudinal direction.

In the illumination device having the above-described configuration, the mask time T8 is changed according to the direction in which the human body crosses the detection area. Therefore, the unnecessary transmission of the output signal S5 is appropriately performed according to the moving direction of the human body. Can be eliminated.

[Third Embodiment] In the third embodiment, a detailed description of the same portions as those of the illumination device described in the first embodiment will be omitted. The lighting device of the third embodiment is different from the lighting device of the first embodiment described above in that it has the following features.

That is, the configuration is such that the mask time T8 is determined by the place where the transmitter C is installed.

Specifically, the installation location is classified into a mobile space and a stay space, and when the transmitter C is installed in the mobile space, the control unit 12 sets the mask time T8 to be long,
When the transmitter C is installed in the stay-type space, the mask time T8 is set short.

The mobile space is a space such as a corridor through which humans mainly pass, and the stay space is a toilet, an entrance,
It is a space such as a conference room where human movement is less than in a mobile space. The reason why the mask time T8 is set long when the transmitter C is installed in the movable space is that the human body detection signal S4 is sequentially input to the control unit 12. On the other hand, the reason why the mask time T8 is set short when the transmitter C is installed in the stay-type space is that it is difficult for the infrared human body detection sensor 11a to detect a human body and the human body detection signal S4 is difficult to be input to the control unit 12. It is.

In the illumination device configured as described above, since the mask time T8 is set according to the installation location, the unnecessary transmission of the output signal S5 can be efficiently eliminated.

In the third embodiment, the control unit 12
Has been described as setting the mask time T8, but the present invention is not limited to this, and any mask time T8 that can be changed according to the installation location of the transmitter C may be used. Therefore, a setting switch may be provided so that the installer or the like can manually set the mask time T8.

[Fourth Embodiment] FIG. 8 is a block diagram showing a configuration of a lighting device. In FIG. 8, the same reference numerals are given to the same parts as those of the lighting device described in the first embodiment, and the detailed description of the same parts will be omitted.

The lighting apparatus according to the fourth embodiment shown in FIG. 8 is different from the lighting apparatus described in the first embodiment in the following features.

That is, a clock 20 is provided in the control unit 12, and the mask time T8 is determined based on the human body detection time.

More specifically, the control unit 12 sets the mask time T8 long in a time zone where there are many traffics such as morning and evening, and in a time zone where the traffic is relatively small such as daytime and nighttime. Sets the mask time T8 short.

The reason why the mask time T8 is lengthened in a time zone where there are many traffics is that the human body detection signal S4 is sequentially input to the control unit 12. On the other hand, the reason why the mask time T8 is shortened during a time period during which traffic is small is that the infrared human body detection sensor 11a does not easily detect a human body because the number of traffic is small, and the human body detection signal S4 is input to the control unit 12. Because it is difficult.

In the illumination device configured as described above, since the mask time T8 is set according to the time zone, the unnecessary transmission of the output signal S5 can be efficiently eliminated.

[Fifth Embodiment] In the fifth embodiment, a detailed description of the same parts as those of the illumination device described in the first embodiment will be omitted. The lighting apparatus according to the fifth embodiment is different from the lighting apparatus described in the first embodiment in the following features.

That is, the mask time T8 is changed to the retrigger time T
7.

More specifically, the control unit 12 increases the mask time T8 when the retrigger time T7 is long, and also shortens the mask time T8 when the retrigger time T7 is short. That is, the transmission of the output signal S5 among the human body detection signals S4 input to the control unit 12 is performed after the elapse of the mask time T8 and before the elapse of the retrigger time T7.
Is only the one input to the control unit 12 at the time of
When the retrigger time T7 is long, the transmission of the unnecessary output signal S5 can be efficiently eliminated by increasing the mask time T8.

In this embodiment, for example, the retrigger time T
If 7 is 30 seconds, the mask time is set to 15 seconds. If the retrigger time T7 is 60 seconds, the mask time is set to T8.
Is 30 seconds.

The setting of the mask time T8 may be set in conjunction with the setting of the retrigger time T7, or the mask time T8 may be set independently.

[Sixth Embodiment] In the sixth embodiment, a detailed description of the same portions as those of the illumination device described in the first embodiment will be omitted. The lighting device of the sixth embodiment is different from the lighting device of the first embodiment described above in that it has the following features.

That is, the configuration is such that the mask time T8 is determined by the number of the human body detection signals S4 input to the control unit 12 per unit time.

More specifically, when the number of human body detection signals S4 input to the control unit 12 per unit time is larger than a predetermined judgment value, the control unit 12 increases the mask time T8, When the number of the human body detection signals S4 input to the control unit 12 is smaller than a predetermined determination value, the mask time T8 is also shortened.

When the number of the human body detection signals S4 inputted to the control unit 12 per unit time is larger than a predetermined judgment value, the mask time T8 is extended because the human body detection signals S4 are inputted to the control unit 12 one after another. This is because that. On the other hand, when the number of the human body detection signals S4 input to the control unit 12 per unit time is smaller than the predetermined determination value, the mask time T8 is shortened.
This is because it is difficult for the infrared human body detection sensor 11a to detect a human body, and it is difficult for the human body detection signal S4 to be input to the control unit 12.

In the illumination device configured as described above, the mask time T8 is set according to the number of the human body detection signals S4 input to the control unit 12 per unit time, so that unnecessary output is efficiently performed. The transmission of the signal S5 can be eliminated.

[Seventh Embodiment] FIG. 9 is an explanatory diagram showing the relationship between the remaining battery power of the internal power supply and the mask time. In the seventh embodiment, detailed description of the same portions as those of the lighting device described in the first embodiment will be omitted. The lighting device of the seventh embodiment is different from the lighting device described in the first embodiment in the following features.

That is, the configuration is such that the mask time T8 is determined by the battery capacity of the internal power supply 14.

Specifically, when the type of battery used as the internal power supply 14 is a manganese battery, the mask time T8 is set longer than in the case of an alkaline battery.

With the above configuration, the manganese battery has a shorter battery life than the alkaline battery. However, by reducing the number of transmissions, the rate of reduction in battery capacity can be suppressed and the battery life can be extended.

As another configuration, a detection unit for detecting the remaining battery capacity may be provided, and the mask time T8 may be determined according to the remaining battery level. For example, as shown in FIG. 9, two short and long mask times T8a and T8b are provided, and if the remaining battery level is larger than a predetermined threshold value of 2.7 [V], the short mask time T8a is used. If the remaining battery level is smaller than a predetermined threshold value 2.7 [V], a longer mask time T8b may be used.

In the second to seventh embodiments, the mask time T8 is determined by one element.
These may be combined to determine the mask time T8. Specifically, for example, the mask time T8 may be determined by combining the size of the detection area and the time element.

In the first to seventh embodiments, the human body detection signal S4 input to the control unit 12 within the mask time T8 is described as being not input. However, the present invention is not limited to this, and the sensor sensitivity of the infrared human body detection sensor 11a may be reduced within the mask time T8 to make it difficult for the human body detection unit 11 to output the human body detection signal S4.

[0060]

According to the first aspect of the present invention, since the illumination device of the present invention is configured as described above, the control unit transmits the output signal within the retrigger time. Since the transmission unit does not transmit the output signal based on the detection of the human body within the mask time, the battery life of the internal power supply of the transmitter is extended, and the illumination load is reduced. There is an effect that it is possible to provide a lighting device which can save energy by suppressing unnecessary lighting.

According to the second aspect of the present invention, the mask time is set long when the detection area of the human body detection section is wide and short when the detection area is small. There is an effect that it is possible to provide a lighting device capable of suppressing unnecessary lighting of a lighting load more appropriately according to a region and saving energy.

According to the third aspect of the present invention, the mask time is set long when the human body crosses the human body detection area in the longitudinal direction and short when the human body crosses the human body detection area in the short direction. According to the present invention, it is possible to provide a lighting device that can suppress unnecessary lighting of a lighting load more appropriately according to a moving direction of a human body and save energy.

In the invention according to claim 4, the mask time is set long when the transmitter is provided in a moving space in which the human body moves in a substantially constant direction, and the human body is determined. If it is installed in a stay space that does not move in the direction, it is set short, so depending on the installation location of the transmitter, a lighting device that can more appropriately suppress unnecessary lighting of the lighting load and save energy It has the effect that it can be provided.

According to the fifth aspect of the present invention, since the length of the mask time is changed according to time, unnecessary lighting of the illumination load is suppressed more appropriately in accordance with the time to save energy. There is an effect that it is possible to provide an illuminating device that can be used.

According to the present invention, the mask time is set to be short when the retrigger time is short, and is set to be long when the retrigger time is long. Thus, it is possible to provide a lighting device capable of more appropriately suppressing unnecessary lighting of a lighting load and saving energy.

In the invention according to claim 7, the mask time is set long when the number of human body detection signals inputted per unit time is large, and the human body detection signal inputted per unit time is set. When the number is small, it is set short, so that it is possible to provide a lighting device capable of appropriately suppressing unnecessary lighting of a lighting load and saving energy according to the number of human body detection signals per unit time. This has the effect.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a lighting device of the present invention.

FIG. 2 is a conceptual diagram illustrating a relationship between a detection beam and a human body detection signal.

FIG. 3 is a time chart showing a relationship among a human body detection signal, an output signal, and a lighting state of a load.

FIG. 4 is an explanatory diagram showing a relationship between a viewing angle of a human body detection sensor and a size of a detection area.

FIG. 5 is an explanatory diagram showing a relationship between a viewing angle of a human body detection sensor and a size of a detection area.

FIG. 6 is a plan view illustrating a detection element shape of the infrared human body detection sensor.

FIG. 7 is an explanatory diagram showing a relationship between a direction in which a person crosses a detection area and an amplifier output value.

FIG. 8 is a block diagram illustrating a configuration of a lighting device of the present invention.

FIG. 9 is an explanatory diagram showing a relationship between a remaining battery power of an internal power supply and a mask time.

FIG. 10 is a block diagram illustrating a configuration of a conventional lighting device.

FIG. 11 is a time chart illustrating a relationship among a human body detection signal, an output signal, and a lighting state of a load.

[Explanation of symbols]

 Reference Signs List 11 human body detection unit 12 control unit 13 transmission unit 15 reception unit 17 load control unit 18 lighting load C transmitter D lighting equipment

Claims (8)

[Claims] 1. A human body detection unit that outputs a human body detection signal when detecting the presence of a human body in a detection area, and, after receiving the human body detection signal, transmits an output signal from a transmission unit and transmits the output signal. A control unit for receiving the human body detection signal again within a predetermined retrigger time and transmitting an output signal again from the transmitting unit after the retrigger time has elapsed, and a receiving unit for receiving the output signal, A lighting control unit that lights a lighting load for a predetermined lighting holding time based on the output signal received by the receiving unit, and a lighting fixture that is installed separately from the transmitter. The control unit has a mask time of a predetermined time after transmitting the output signal within the retrigger time,
An illumination device, wherein an output signal is not transmitted from a transmission unit based on a human body detection within the mask time. 2. The illumination device according to claim 1, wherein the mask time is set long when the detection area of the human body detection unit is wide, and is set short when the detection area is small. . 3. The detection area has a substantially rectangular shape having a longitudinal direction and a lateral direction, and the mask time is set long when a human body crosses the human body detecting area in the longitudinal direction. 2. The lighting device according to claim 1, wherein the distance is set to be short when the light beam crosses the plane. 4. The mask time is set long when the transmitter is provided in a moving space in which a human body moves in a substantially constant direction, and is set in a stay space in which the human body does not move in a fixed direction. The lighting device according to claim 1, wherein the lighting device is set to be shorter when the lighting device is turned on. 5. The lighting device according to claim 1, wherein the length of the mask time is changed according to the time of human body detection. 6. The illumination device according to claim 1, wherein the mask time is set short when the retrigger time is short, and set long when the retrigger time is long. 7. The mask time is set long when the number of human body detection signals input per unit time is large,
2. The lighting device according to claim 1, wherein when the number of human body detection signals input per unit time is small, the number is set short. 8. The method according to claim 1, wherein the mask time is set longer if the battery capacity of the internal power supply for supplying the transmitter is small, and is set short if the battery capacity of the internal power supply for supplying the transmitter is large. The lighting device according to claim 1.