JP2001345188A - Luminaire with automatic light control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire with an automatic light control device having a constitution for avoiding malfunctions by erroneous detection of sensors caused by heat conduction from a lamp. SOLUTION: This luminaire is provided with the two pyroelectric sensors 34a and 34b having individual detecting ranges and the automatic light control device 37 for controlling lighting of the lamp 19 on the basis of detected signals of the respective pyroelectric sensors 34a and 34b. The automatic light control device 37 judges that a human body exists in the detecting ranges when either one output signal of the two pyroelectric sensors 34a and 34b is larger than a reference value and a difference signal of the detecting signals of the two pyroelectric sensors 34a and 34b is larger than the reference value. The two pyroelectric sensors 34a and 34b are desirably constituted so as to detect the presence of the human body in the individual detecting ranges via a common condensing lens.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting fixture with an automatic lighting control device for detecting the presence of a person within a predetermined detection range by a pyroelectric sensor (infrared sensor) and controlling the lighting of a lamp based on the detection signal. About.

[0002]

2. Description of the Related Art FIG. 1 shows an example of this type of lighting fixture with an automatic lighting control device. The lighting apparatus 11 is a pyroelectric sensor (hereinafter, referred to as a pyroelectric sensor).
12). The sensor 12 includes a condenser lens (not shown), and can detect infrared rays emitted from a predetermined detection range 13.

FIGS. 2A and 2B are a block diagram showing a circuit configuration of the lighting apparatus of FIG. 1 and a signal waveform diagram of each section. The detection signal of the sensor 12 is input to the amplifier 15 of the automatic lighting control device 14 and amplified. Vam in FIG. 2 (b)
The output signal of the amplifier 15 as exemplified by p is input to the comparator 16 and compared with the reference voltage 16a. As a result, a voltage signal as indicated by Vcomp in FIG. This signal Vcomp is input to the timer 17, and is output from the timer 17 to Vti in FIG.
A voltage signal as shown in FIG. The output voltage Vtim of the timer 17 is given to the lamp driving unit 18 and
The lamp 19 is turned on only when m is at the H level (high level). A predetermined power supply current is supplied from the commercial power supply 20 to the automatic lighting control device 14 and the lamp drive unit 18 via the power supply unit 21.

When a human body enters the detection range 13 of the sensor 12, the output signal Vamp of the amplifier 15 indicating the infrared detection level becomes higher than the reference voltage 16a, and the output signal Vcomp of the comparator 16 becomes H level. As a result, the output signal Vtim of the timer 17 also becomes H level,
Lights up. When the human body comes out of the detection range 13 of the sensor 12, the output signal Vamp becomes lower than the reference voltage 16a,
The output signal Vcomp of the comparison unit 16 becomes L level. However, since the output signal Vtim of the timer 17 does not immediately go to the L level but remains at the H level for a set period, the lamp 19 maintains the lighting state during that time. V in FIG. 2 (b)
tim ′ indicates a state in which the value of the timer 17 counts down after the output signal Vcomp of the comparison unit 16 becomes L level, replaced with a voltage. When the timer value (Vtim ') becomes zero, Vtim returns to the L level.

[0005]

When the above-described lighting fixture with an automatic lighting control device is installed, there are the following problems regarding the positional relationship between the lamp 19 and the sensor 12.

As shown in FIG. 3, when the shade of the lamp 19 covers a part of the detection range 13 of the sensor 12, the detection range 13
A shadow portion 23 is generated in this portion, and a human body cannot be correctly detected in this portion. As shown in FIG.
This problem can be solved by separating the sensor and the sensor 12, but a problem arises in that the entire lighting fixture with an automatic lighting control device becomes large.

Further, there is also a problem that the sensor 12 detects erroneously due to the surface temperature of the shade of the lamp 19. To solve this problem, it is necessary to sufficiently separate the lamp 19 and the sensor 12. The convection of wind or air or radiant heat causes the lamp 19
This is because the surface temperature of the shade may cause erroneous detection of the sensor 12. In this case, there is a problem that the lamp continues to light without extinguishing even though the set time has elapsed after the person exits the detection range.

[0008] It is an object of the present invention to provide a lighting fixture with an automatic lighting control device having a configuration for avoiding the above-mentioned problems caused by erroneous detection of a sensor.

[0009]

A first configuration of a lighting apparatus with an automatic lighting control device according to the present invention is an automatic lighting apparatus for controlling lighting of a lamp based on two pyroelectric sensors and a detection signal of each pyroelectric sensor. A lighting control device, wherein the automatic lighting control device lowers the detection sensitivity of one of the two pyroelectric sensors so that the levels of detection signals finally obtained from the two pyroelectric sensors are substantially the same. It is characterized in that it is controlled so that

According to this configuration, the detection sensitivity of the pyroelectric sensor closer to the lamp, which is a heat source, can be reduced, and the effect of heat from the lamp can be reduced. For example, the detection sensitivity of the pyroelectric sensor can be reduced by lowering the amplification factor of the amplifier that amplifies the output signal of one of the two pyroelectric sensors. Alternatively, the detection sensitivity of the pyroelectric sensor is reduced by changing the reference value of the comparison unit that compares the output signal of the amplification unit that amplifies the output signal of one of the two pyroelectric sensors with the reference value. Can be.

A second configuration of the luminaire with an automatic lighting control device according to the present invention comprises two pyroelectric sensors having individual detection ranges and an automatic lighting control for controlling the lighting of the lamp based on the detection signal of each pyroelectric sensor. A lighting control device, wherein the automatic lighting control device controls the lighting of the lamp based on a change in a difference signal between the detection signals of the two pyroelectric sensors. It is unlikely that two pyroelectric sensors having separate detection ranges detect a person at the same time, and such a detection state can be considered to be due to erroneous detection. Thereby, erroneous detection can be avoided. For example, when the output signal of one of the two pyroelectric sensors is larger than the reference value and the difference signal is larger than the reference value, it is determined that a person exists in the detection range.

[0012] Preferably, the two pyroelectric sensors are configured to detect the presence of a person within an individual detection range via a common condenser lens. Usually, the effect of heat from the lamp is caused by the heat of the lamp being transmitted to the condenser lens of the pyroelectric sensor by convection or radiation. Therefore, if the condenser lens is common, the influence of the heat from the lamp is considered to act on the two pyroelectric sensors almost equally.
Therefore, when the lighting control of the lamp is performed based on a change in the difference signal between the detection signals of the two pyroelectric sensors, the influence of heat from the lamp can be eliminated.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 5 shows the appearance of a lighting fixture with an automatic lighting control device according to a first embodiment of the present invention. The lighting fixture 11 with an automatic lighting control device includes a lamp 19, a first sensor 25, and a second sensor 26. The first sensor 25 and the second sensor 26 include a condenser lens (not shown), and can detect infrared rays emitted from predetermined detection ranges 13a and 13b. As shown in FIG. 5, any one of the sensors (first sensor 25)
The shade of the lamp 19 may be applied to a part of the detection range 13a, and a shadow portion 13c may occur in the detection range 13a. As described above, the lighting fixture with the automatic lighting control device of the present embodiment is different from the conventional lighting fixture with the automatic lighting control device in having the two sensors 25 and 26.

FIG. 6 is a block diagram showing a circuit configuration of a lighting fixture with an automatic lighting control device according to the first embodiment of the present invention. The same elements as those in the conventional circuit configuration shown in FIG. The detection signals of the first sensor 25 and the second sensor 26 are input to the first amplifier 28 and the second amplifier 29 of the automatic lighting control device 27, respectively, and are amplified. Output signals of the first amplifier 28 and the second amplifier 29 are input to the first comparator 30 and the second comparator 31, respectively, and are compared with the reference voltage 30a or 31a. The output voltages of the first comparison unit 30 and the second comparison unit 31 are input to the timer 33, the output voltage of the timer 33 is supplied to the lamp driving unit 18, and the lamp 19 is turned on only when the output voltage of the timer 33 is at the H level. I do. A predetermined power supply current is supplied from the commercial power supply 20 to the automatic lighting control device 27 and the lamp drive unit 18 via the power supply unit 21.

Further, a first amplifier 28 and a second amplifier 29
Are also input to the sensitivity adjustment unit 32. The sensitivity adjuster 32 receives the input first amplifier 28 and second amplifier 2
9, the amplification factors (gains) of the first amplifying unit 28 and the second amplifying unit 29 or the reference voltages 30a and 31a of the first comparing unit 30 and the second comparing unit 31 are changed. The amplification factor or the reference voltage may be changed for both the first and second sensors 25 and 26. However, one of the amplification factors or the reference voltage is fixed, and the other amplification factor or the reference voltage is changed. You may do so.

For example, in FIG. 5, the amplification factor of the first amplifying unit 28 for the first sensor 25 near the lamp 19 as the heat source is reduced. Alternatively, the reference voltage 30a of the first comparing section 30 is increased. As a result, the detection sensitivity of the first sensor 25 is lower than the detection sensitivity of the second sensor 26, and the influence of heat from the lamp 19 is reduced.

FIG. 7 is a timing chart showing an example of control for lowering the amplification factor of the first amplifier 28. In this control example, the amplification factor of the first amplification unit 28 is reduced as the output of the comparison unit becomes H level and the lamp 19 is turned on. As the output of the comparison section returns to the L level and the lamp 19 is turned off after the set time has elapsed, the amplification factor of the first amplification section 28 is returned to the original level.

FIG. 8 is a timing chart showing another example of control for lowering the amplification factor of the first amplifier 28. In this control example, as soon as the lamp 19 is turned on, the first amplifier 2
Instead of lowering the amplification factor of 8, the amplification factor of the first amplification unit 28 is reduced after a predetermined time elapses in consideration of the time until the influence of the heat generated by the lamp 19 affects the detection signal of the first sensor 25. Similarly, the gain of the first amplifying unit 28 is restored (increased) not immediately after the lamp is turned off but after a lapse of a predetermined time.

(Embodiment 2) FIG. 9 shows the appearance of a lighting fixture with an automatic lighting control device according to a second embodiment of the present invention. The lighting fixture 11 with an automatic lighting control device includes a lamp 19 and a combination sensor 34.
As shown in FIG. 10 or FIG. 11, the combination sensor 34 includes a first sensor 34a and a second sensor 34b, through a common condenser lens 34c or 34d.
Or 36 is configured to detect infrared rays.

Normally, erroneous detection of the sensor due to heat generation of the lamp occurs via the condenser lens. That is, the heat generated from the lamp reaches the condenser lens by convection or radiation, and is generated when the sensor detects this.

In the combination sensor 34 shown in FIG. 10 or 11, the first sensor 34a and the second sensor 34
b covers different detection ranges via the common condenser lens 34c or 34d, but the condenser lens 34c or 34d
It is considered that the effect of the heat received from the lamps of the first and second sensors acts almost equally on the first sensor 34a and the second sensor 34b. That is, the first sensor 34 due to the effect of heat received from the lamp
It is considered that the changes in the output levels of “a” and the second sensor 34b are almost the same.

On the other hand, when the human body enters the detection range 35 or 36 of the first sensor 34a or the second sensor 34b, the output levels of the first sensor 34a and the second sensor 34b do not change at the same time. Only the level changes. Therefore, the first sensor 34a and the second sensor 34
If the presence or absence of a human body is determined from the change in the difference between the output levels of b, the influence of heat from the lamp, that is, malfunction can be avoided.

FIG. 12 is a block diagram of a lighting fixture with an automatic lighting control device according to a second embodiment for detecting a human body based on the above principle. First sensor 34a and second sensor 34a
The detection signals of the sensors 34b are respectively transmitted to the automatic lighting control device 3
7 and are amplified by the first and second amplifiers 38 and 39. Output signals of the first amplifier 38 and the second amplifier 39 are input to the first comparator 40 and the second comparator 41, respectively, and compared with the reference voltage 40a or 41a.

The output voltages of the first comparing section 40 and the second comparing section 41 are input to the difference change detecting section 42. The output signals of the first amplifier 38 and the second amplifier 39 are also input to the difference change detector 42. The difference between the output signals of the first amplifier 38 and the second amplifier 39 is output by the differential amplifier 42a, and the absolute value is output from the ABS circuit 42b.
The absolute value of the difference is compared with the reference voltage 42d by the comparator 42c, and the comparison output becomes one input of the AND gate 42f. The output voltages of the first comparing section 40 and the second comparing section 41 are O
The signal is input to the R gate 42e, and its output is
The other input of 2f. Therefore, the first amplifier 38
AND when the absolute value of the difference between the output signals of the second and third amplifiers 39 is higher than the reference voltage 42d and one of the output voltages of the first and second comparators 40 and 41 is at the H level.
The output of the gate 42f becomes H level.

The output of the AND gate 42f is input to the timer 43, the output voltage of the timer 43 is applied to the lamp driving unit 18, and the lamp 19 is turned on only when the output voltage of the timer 43 is at the H level. A predetermined power supply current is supplied from the commercial power supply 20 to the automatic lighting control device 37 and the lamp driving unit 18 via the power supply unit 21.

As described above, the absolute value of the difference between the output signals of the first amplifier 38 and the second amplifier 39 is equal to the reference level (for example, 5 of the reference level of the first comparator 40 and the second comparator 41).
0%) is a necessary condition for human body detection. In this way, it is possible to avoid the influence of heat received from the lamp, that is, malfunction. At this time, the first sensor 34
a and the second sensor 34b need to be configured to cover different detection ranges via the common condenser lens 34c or 34d. However, there is no problem even if some detection ranges overlap.

(Embodiment 3) FIG. 13 is a block diagram of a lighting fixture with an automatic lighting control device according to a third embodiment of the present invention. This lighting fixture with an automatic lighting control device is a combination of the first embodiment shown in FIG. 6 and the second embodiment shown in FIG. That is, the automatic lighting control device 37 'in the present embodiment is different from the automatic lighting control device 37 in the second embodiment shown in FIG.
4 is added.

The sensitivity adjuster 44 receives the output signals of the first and second amplifiers 38 and 39 and amplifies the signals of the first and second amplifiers 38 and 39 in accordance with the levels of these output signals. Rate (gain) or first comparing section 40 and second comparing section 4
One of the reference voltages 40a and 41a is changed. For example, the dark noise of each sensor is detected in a state where a heat source such as a human body does not enter the detection range, and the amplification factors of the first amplifying unit 38 and the second amplifying unit 39 are adjusted so that the outputs become substantially uniform. For example, the output amplitude is adjusted so as to be 1/3 ± 10% of the reference voltages 40a and 41a of the comparison units 40 and 41. First amplification section 38
And instead of adjusting the amplification factor of the second amplifier 39,
Reference voltages 40a and 41 of the comparison unit 40 and the second comparison unit 41
a may be adjusted.

The above-described adjustment may be performed when the outputs of the first amplifier 38 and the second amplifier 39 are lower than a predetermined level. The responsiveness of the control at this time is set to be sufficiently slower than the responsiveness of the amplifiers 38 and 39 to the movement of the human body. The movement of the human body is output with a frequency characteristic having a peak at about 1 kHz, and adjustment is performed, for example, every 10 seconds.

The lighting apparatus with the automatic lighting control device according to the present invention has been described according to various embodiments. However,
The present invention is not limited to the above embodiment, but may be implemented in other forms. For example, the present invention can be applied not only to the control of turning on or off the lamp but also to dimming control for changing the brightness of the lamp.

[0032]

As described above, according to the lighting fixture with an automatic lighting control device of the present invention, erroneous detection due to the influence of convection heat or radiant heat from the lamp is avoided, and the automatic lighting control is stabilized. It can be carried out.

[0033]

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a conventional lighting fixture with an automatic lighting control device.

FIG. 2 is a block diagram showing a circuit configuration of a conventional lighting fixture with an automatic lighting control device and a signal waveform diagram of each unit.

FIG. 3 is a diagram for explaining a problem of a conventional lighting fixture with an automatic lighting control device.

FIG. 4 is a diagram for explaining another problem of a conventional lighting fixture with an automatic lighting control device.

FIG. 5 is a view showing an external appearance of a lighting fixture with an automatic lighting control device according to the first embodiment of the present invention.

FIG. 6 is a block diagram showing a circuit configuration of the lighting fixture with the automatic lighting control device according to the first embodiment of the present invention.

FIG. 7 is a timing chart showing an example of control for lowering the amplification factor of the first amplifier.

FIG. 8 is a timing chart showing another example of control for lowering the amplification factor of the first amplifier.

FIG. 9 is a view showing the appearance of a lighting fixture with an automatic lighting control device according to a second embodiment of the present invention.

FIG. 10 is a diagram illustrating a configuration example of a combination sensor.

FIG. 11 is a diagram showing another configuration example of the combination sensor.

FIG. 12 is a block diagram of a lighting fixture with an automatic lighting control device according to a second embodiment of the present invention.

FIG. 13 is a block diagram of a lighting fixture with an automatic lighting control device according to a third embodiment of the present invention.

[Explanation of symbols]

 11 Lighting equipment with automatic lighting control device 25, 26, 34a, 34b Pyroelectric sensor 13a, 13b, 35, 36 Detection range 19 Lamp 27, 37, 37 'Automatic lighting control device 28, 29, 38, 39 Amplifying unit 30, 31, 40, 41 Comparison unit 42 Difference change detection unit 34c, 34d Condensing lens

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K014 GA03 3K073 AA12 AA21 AA28 AA41 BA25 CF13 CF18 CG02 CG15 CG43 CJ00 CJ11 CJ22

Claims (6)

[Claims] An illumination device with an automatic lighting control device for detecting presence of a person within a predetermined detection range by a pyroelectric sensor and controlling lighting of a lamp based on the detection signal, wherein the two pyroelectric sensors And an automatic lighting control device that performs lighting control of the lamp based on a detection signal of each pyroelectric sensor,
The automatic lighting control device controls the detection levels of the detection signals finally obtained from the two pyroelectric sensors to be substantially the same by lowering the detection sensitivity of one of the two pyroelectric sensors. A lighting fixture with an automatic lighting control device, characterized in that: 2. The automatic lighting control device according to claim 1, wherein the detection sensitivity of the pyroelectric sensor is reduced by lowering an amplification factor of an amplification unit that amplifies an output signal of one of the two pyroelectric sensors. The lighting fixture with an automatic lighting control device according to claim 1. 3. The automatic lighting control device changes the reference value of a comparison unit that compares an output signal of an amplification unit that amplifies an output signal of one of the two pyroelectric sensors with a reference value, The lighting fixture with an automatic lighting control device according to claim 1, wherein the detection sensitivity of the pyroelectric sensor is reduced. 4. A lighting device with an automatic lighting control device for detecting presence of a person within a predetermined detection range by a pyroelectric sensor and controlling lighting of a lamp based on the detection signal. And an automatic lighting control device for controlling the lighting of the lamp based on the detection signal of each pyroelectric sensor.
A lighting device with an automatic lighting control device, wherein lighting control of a lamp is performed based on a change in a difference signal between detection signals of two pyroelectric sensors. 5. When the output signal of one of the two pyroelectric sensors is larger than a reference value and the difference signal is larger than the reference value, it is determined that a person exists in the detection range. The lighting fixture with an automatic lighting control device according to claim 4. 6. The automatic lighting control device according to claim 4, wherein the two pyroelectric sensors are configured to detect the presence of a person within an individual detection range via a common condenser lens. lighting equipment.