JPH10302968A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire with a low cost capable of achieving energy saving while ensuring proper brightness by controlling, without inconvenience, means common to the same device irrespective of a difference in the number of illumination fixtures when daylight is efficiently utilized or when an initial optical flux of the light source is efficiently utilized, in the luminaire for feedback-controlling optical output of a light source by detecting luminance of an irradiated face. SOLUTION: This device is provided with an illumination part 2 having a light source and illuminating means for illuminating the light source, brightness detecting means 1 for detecting luminance of an irradiated face, and a control part 3 receiving a detected value of the brightness detecting means 1 and controlling optical output of the light source in a direction in which luminance of this irradiated face is within a target range. When the detected value of the detecting means 1 reaches the target range, a dimming level of the light source when the detected valve of the brightness detecting means 1 reaches the target range is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device, and more particularly to an illuminating device for detecting the illuminance of a surface to be illuminated by a brightness detecting means and performing feedback control of the light output of a light source.

[0002]

2. Description of the Related Art A first conventional example according to the present invention will be briefly described with reference to FIG.

In this example, the brightness level is sequentially feedback-controlled in response to past brightness information. The light amount of the light source is corrected so that the brightness level becomes a certain state. However, as shown in FIG. 10B, a representative point calculation value of a past brightness detection amount for a certain period from the time of correction (for example, Since the correction is performed using the average value or the radian value, for example, the light source does not follow a sudden change such as external light as shown in FIG. The brightness level can be adjusted.

Next, a second conventional example according to the present invention will be briefly described with reference to FIG. In this example, the brightness level is feedback-controlled after measuring the brightness for a certain period. The effective use of the initial luminous flux of the light source and the use of daylight can be shared, and the brightness level can be corrected at a gradual speed in order to eliminate uncomfortable feeling for a person working in the lighting control area. . As shown in FIG. 11A, the light amount level of the light source is not changed during the fixed period Δta, and the brightness level is measured by the brightness detecting means as shown in FIG. Value) is compared with the set brightness level, and the light output amount of the light source is corrected for a certain period Δt1 as shown in FIG. When the correction is completed, the brightness level is measured again. Thereafter, this is repeated.

As described above, the first and second conventional examples are as follows.
This is a means for keeping a sense of discomfort caused by a change in artificial lighting as little as possible without following a sudden change in external light or the like.

[0006]

However, the first conventional example has the following first problem.

Since the information on the past brightness is also included in the judgment level for correcting the light amount of the current light source, A shown in FIG.
In the period of, the actual surrounding brightness is darkened, but the light source is still controlled so as to be dark, that is, it is controlled in a direction away from the required brightness level.

In the second conventional example, the following second problem occurs. When comparing the case where a small number of light sources are controlled with the same device and the case where a large number of light sources are controlled, in the case of a small number of light sources, it is rare that a single correction passes through the target illuminance range. In the case of a large number of light sources, the light often passes through the target illuminance range by one correction, and if the light is repeatedly passed through, the correction shown in FIG.
As shown in (b), a self-resonance phenomenon occurs. In order to suppress this self-resonance phenomenon, the target illuminance range is expanded,
There is also a means. However, if the control amount is set so as to prevent the self-resonance phenomenon when controlling a large number of light sources, the controllability of the light will be considerably degraded when controlling a small number of light sources. There is a big difference in the followability of

SUMMARY OF THE INVENTION The present invention has been made in view of all of the above problems, and has as its object to provide a small illuminating device for detecting the illuminance of a surface to be illuminated and performing feedback control of the light output of a light source. Whether you use the daylight or the initial light flux of the light source effectively, whether in a place with a small number of lighting fixtures, such as an office, or a place with a large number of lighting fixtures, such as a store. Another object of the present invention is to provide a low-cost lighting device that can achieve energy saving while ensuring appropriate brightness without inconvenience by a common control method using the same device regardless of the number of lighting devices.

[0010]

According to the first aspect of the present invention, there is provided an illumination unit having a light source and lighting means for lighting the light source, and detecting an illuminance on a surface to be illuminated. And a control unit that receives the detection value of the brightness detection unit and controls the light output of the light source in a direction in which the illuminance of the illuminated surface is within a target range. When the detected value reaches the target range, the light control level of the light source when the detected value reaches the target range is maintained.

According to the second aspect of the present invention, the illumination unit having the light source and the lighting means for lighting the light source, the brightness detection means for detecting the illuminance of the illuminated surface, and the detection value of the brightness detection means. A control unit for controlling the light output of the light source in a direction in which the illuminance of the surface to be irradiated is within the target range.
When the detected value rises and becomes equal to or more than the target lower limit, the light control level of the light source when the detected value becomes equal to or more than the target lower limit is maintained.

According to the third aspect of the present invention, the illumination unit having the light source and the lighting means for lighting the light source, the brightness detection means for detecting the illuminance of the illuminated surface, and the detection value of the brightness detection means. A control unit for controlling the light output of the light source in a direction in which the illuminance of the surface to be irradiated is within the target range.
When the detected value decreases to be equal to or less than the target upper limit, the light control level of the light source when the detected value becomes equal to or less than the target lower limit is maintained.

According to a fourth aspect of the present invention, there is provided a measurement section for measuring an integrated average value of detected values.

According to a fifth aspect of the present invention, in the measurement section, the dimming level of the light source is substantially constant.

According to a sixth aspect of the present invention, when the integrated average value is different from the target range, the measurement section is shifted to a correction section for correcting the dimming level of the light source.

According to the seventh aspect of the present invention, the dimming level of the light source changes stepwise in the correction section.

According to an eighth aspect of the present invention, the length of the measurement section changes according to the detected value.

According to the ninth aspect of the present invention, the dimming level correction amount of the light source in the correction section changes according to the detected value.

According to the tenth aspect, the dimming level change amount per unit time of the light source in the correction section is:
It is characterized in that it changes according to the detected value.

[0020]

Embodiment

(Embodiment 1) FIG. 1 shows a block diagram of a first embodiment according to the present invention, and FIGS. 2, 3 and 4 show operation waveform diagrams thereof.

In this configuration, the illuminating unit 2 having a light source, the brightness detecting means 1 for detecting the illuminance of the illuminated surface, and the illuminance of the illuminated surface in response to the value detected by the brightness detecting means 1 A control unit 3 for controlling the light output of the light source by the dimming signal so as to be within the target range, and the detection value of the brightness detecting means 1 so that the illuminance of the illuminated surface is within the target range. The light output of the illumination unit 2 is controlled based on the above, that is, feedback control is performed so that the brightness detection unit 1 obtains a preset detection value.

Next, the operation will be briefly described with reference to the operation waveform diagrams shown in FIGS. 2, 3 and 4. The light output amount of the light source does not change for a certain period, the detection value of the brightness detecting means 1 is integrated for a certain time to obtain an integrated average value, and the obtained value is compared with a preset target range of the detection value. If the integrated average value is out of the target range as shown in FIG. 2A, as shown in FIG.
The light output amount of the light source is set to a direction included in the target range for a certain period t.
Correct by one.

Here, when the detected value of the brightness detecting means 1 reaches the target range during the correction, the correction is terminated even if a certain period has not elapsed, and the light control signal level at that time is maintained.

As shown in FIG. 3A, if the integrated average of the detection values of the brightness detecting means 1 during the period ta is smaller than the target lower limit, the period tx is reduced as shown in FIG. 3B. The dimming signal is corrected in the direction of increasing the dimming signal level by α. However, as shown in FIG. 3A, if the detected value of the brightness detecting means 1 exceeds the target lower limit before the period tx elapses, FIG. 3 (b)
As shown in (5), the change of the dimming signal level is stopped, and the process shifts from the correction section to the measurement section. If the detected value of the brightness detecting means 1 does not exceed the target lower limit value by the elapse of the period tx, the dimming signal level is increased by α in the period tx, the dimming signal is maintained, and the process shifts to the measurement section again. .

As shown in FIG. 4A, if the integrated average value of the detection values of the brightness detecting means 1 during the period ta is larger than the target upper limit value, as shown in FIG. β in ty
The dimming signal is corrected only in the direction of lowering the dimming signal level. However, as shown in FIG. 4A, when the detected value of the brightness detecting means 1 falls below the target upper limit before the period ty elapses, FIG. 4
As shown in (b), the change in the dimming signal level is stopped, and the process shifts from the correction section to the measurement section. If the detected value of the brightness detecting means 1 does not fall below the target upper limit value by the elapse of the period ty, the dimming signal level is decreased by β in the period ty, the dimming signal is maintained, and the process shifts to the measurement section again. .

(Embodiment 2) FIG. 5 shows a block diagram of a second embodiment according to the present invention, and FIGS. 6 and 7 show operation waveform diagrams thereof.

There are lighting control units A and B. The lighting control unit A includes a brightness detecting means 1a installed at a position where the reflected light from the surface to be irradiated enters the ceiling surface, and N6 lighting devices 2 And a control unit 3 that receives the detection value of the brightness detection unit 1a and controls the N6 luminaires 2. On the other hand, the illumination control unit B includes a brightness detection unit 1b installed at a position where reflected light from the surface to be irradiated enters the ceiling surface;
There are provided Nn lighting fixtures 2 and a control unit 3 for controlling the Nn lighting fixtures 2 based on the detection values of the brightness detecting means 1b.

However, N6 << Nn, the control unit 3 and the brightness detecting means 1 in each lighting control unit are the same, the type of dimming signal is the same, and the lighting fixture 2 in each lighting control unit is Output the same light when receiving the same dimming signal,
And However, it is assumed that, even if the dimming signal is changed by the same amount, the change in illuminance of the illuminated surface detected by the brightness detecting means 1 increases as the number of lighting fixtures 2 increases.

The operation will be briefly described below with reference to the operation waveform diagrams shown in FIGS. FIG. 6 shows a case where the initial illuminance of the irradiated surface is lower than the target lower limit. When it is detected that the integrated average value (for example, 30 averages of data every one second) of the brightness detection section 1 in the brightness measurement section (for example, 30 seconds) is lower than the target lower limit value, the correction section Δt2 (for example, 10 seconds). In the correction section Δt2, the dimming signal level is increased (for example, 1 step up × 10 times) by β (for example, 10 steps) in a direction to become brighter. FIG.
As shown in FIG. 7A, the value of the brightness detection means 1 is detected as shown in FIG. 7B while increasing by β (for example, the brightness is increased 0.5 seconds after one step of the dimming signal is up). The value of the detecting means 1 is detected, and one step up is performed after 0.5 seconds, provided that the change in brightness corresponding to the step up can be sufficiently detected by the brightness detecting means 1). As shown in FIG. 6D, while increasing the dimming signal level by β, the brightness detecting means 1
If the detected value exceeds the target lower limit value, the change of the dimming signal is stopped at that point and the processing shifts to the brightness measurement section. FIG.
As shown in (b), if the detected value of the brightness detecting means 1 does not exceed the target lower limit value even if the dimming signal level is increased by β, the processing shifts to the brightness measurement section again.

Here, since the control unit B has a larger change in the illuminance of the illuminated surface detected by the brightness detecting means 1 as the number of the luminaires 2 is larger than the control unit A, the dimming signal is set to 1 FIG. 6B and FIG.
As shown in (d), the control unit B is the brightness detection means 1
Changes in the detected value of. The graph on the left side of the drawing of FIG. 7 shows the case where the change of the dimming signal is stopped by detecting the value of the brightness detecting means 1 within the target range.
The graph on the right side of the drawing of FIG. 1 shows the case where the change of the dimming signal is stopped by detecting the value of the brightness detecting means 1 beyond the target range.

FIG. 8 shows a case where the initial illuminance of the irradiated surface is higher than the target upper limit. When it is detected that the integrated average value (for example, 30 averages of data every one second) of the brightness detection section 1 in the brightness measurement section (for example, 30 seconds) is higher than the target upper limit value, the correction section Δt1 (for example, 5 seconds). In the correction section Δt1, the dimming signal level is decreased by α (for example, 5 steps) in a darkening direction (for example, 1 step down × 5 times). While decreasing by α as shown in FIG. 9A, the brightness detecting means 1 as shown in FIG.
(For example, a dimming signal one step down)
0.9 seconds later, the value of the brightness detecting means 1 is detected.
After one second, one step down, where a change in brightness corresponding to the step down can be sufficiently detected by the brightness detecting means 1). As shown in FIG. 8 (d), if the detected value of the brightness detecting means 1 falls below the target upper limit while the dimming signal level is decreased by α, the change of the dimming signal is stopped at that point. Move to the brightness measurement section. As shown in FIG. 8B, if the detected value of the brightness detecting means 1 does not fall below the target upper limit even if the dimming signal level is decreased by α, the processing shifts to the brightness measurement section again.

Here, since the control unit B has a greater change in the illuminance of the illuminated surface detected by the brightness detecting means 1 as the number of the luminaires 2 is larger than the control unit A, the dimming signal is set to 1 8 (b) and 8
As shown in (d), the control unit B is the brightness detection means 1
Changes in the detected value of. Further, the graph on the left side in the drawing of FIG. 9 is a graph on the right side in the drawing of FIG. 9 when the change of the dimming signal is stopped by detecting the value of the brightness detection means 1 within the target range. Shows a case where the change of the dimming signal is stopped by detecting the value of the brightness detecting means 1 beyond the target range.

(Embodiment 3) A third embodiment according to the present invention will be described below.

This embodiment is different from the second embodiment in that the length of the brightness measurement section is changed as occasion demands, and is the same as that of the other second embodiments. The description is omitted by giving the same reference numerals to the components.

If the integrated average value of the brightness detector 1 in the brightness measurement section is within the target range, the brightness measurement section is lengthened (for example, 50 seconds). If the detected value of the brightness detecting means 1 exceeds the target lower limit value while increasing the dimming signal level by α, or if the detected value of the brightness detecting means 1 increases to the target upper limit while decreasing the dimming signal level by β. If the value is less than the value, the length of the brightness measurement section does not change (for example, 40 seconds). Even if the dimming signal level is increased by α, if the detection value of the brightness detecting means 1 does not exceed the target lower limit, or if the dimming signal level is decreased by β, the detection value of the brightness detecting means 1 will not reach the target value. If it does not fall below the upper limit, the brightness measurement section is shortened (for example, 30 seconds). However, the brightness measurement section has an upper limit and a lower limit (for example, the upper limit is 60 seconds and the lower limit is 10 seconds).

(Embodiment 4) A fourth embodiment according to the present invention will be described below.

This embodiment is different from the second embodiment in that the correction amounts α and β of the dimming signal level are changed as occasion demands. The same components as those of the embodiment are denoted by the same reference numerals, and description thereof will be omitted.

If the integrated average value of the brightness detection means 1 in the brightness measurement section is within the target range, the correction amounts α and β of the dimming signal level are not changed (for example, α is 20 steps, β is 10 steps). . If the detected value of the brightness detecting means 1 exceeds the target lower limit while raising the dimming signal level by α,
Alternatively, if the detected value of the brightness detecting means 1 falls below the target upper limit while the dimming signal level is decreased by β, the correction amounts α and β of the dimming signal level are reduced (for example, when the up is performed, α For 15 steps, β when down
To 5 steps). Even if the dimming signal level is increased by α, if the detection value of the brightness detecting means 1 does not exceed the target lower limit, or if the dimming signal level is decreased by β, the detection value of the brightness detecting means 1 will not reach the target value. If the value does not fall below the upper limit value, the correction amounts α and β of the dimming signal level are increased (for example, α is 25 steps when up, and β is 15 steps when down). However, the dimming signal level correction amounts α and β have an upper limit and a lower limit (for example, α is 2 to 40 steps and β is 3 to 30 steps).

(Embodiment 5) A fifth embodiment according to the present invention will be described below.

This embodiment is different from the second embodiment in that the dimming signal change amount Δα / Δt1, Δ
The configuration is such that β / Δt2 is changed, and the same components as those of the second embodiment are denoted by the same reference numerals and description thereof is omitted.

If the integrated average value of the brightness detection means 1 in the brightness measurement section is within the target range, the dimming signal change amount Δα / Δ
t1 and Δβ / Δt2 are not changed. If the detected value of the brightness detecting means 1 exceeds the target lower limit value while increasing the dimming signal level by α, or if the detected value of the brightness detecting means 1 increases to the target upper limit while decreasing the dimming signal level by β. If the value is below the value, the dimming signal change amount Δα / Δt1, Δβ / Δt2
(For example, when up, α every 3 seconds)
Is set to two steps, and when down is performed, β is set to one step every two seconds). Even if the dimming signal level is increased by α, if the detection value of the brightness detecting means 1 does not exceed the target lower limit, or if the dimming signal level is decreased by β, the detection value of the brightness detecting means 1 will not reach the target value. If the value does not fall below the upper limit value, the dimming signal change amounts Δα / Δt1 and Δβ / Δt2 are increased (for example, α is increased by 1.5 steps every 0.8 seconds when up, and 0 when down) .Beta. Is set to 1.2 steps every 9 seconds) However, the dimming signal change amount .DELTA.
α / Δt1 and Δβ / Δt2 have an upper limit and a lower limit.

[0042]

According to the first to tenth aspects of the present invention, an illumination device that detects the illuminance of a surface to be illuminated and feedback-controls the light output of a light source regardless of the number of luminaires is the same. With a common control method in the device, it is possible to prevent unpleasant phenomena such as self-resonance phenomena while maintaining the following of light without inconvenience, without following the temporary sudden change in illuminance change on the irradiated surface Since it follows slow changes, it is possible to provide a low-cost lighting device that can greatly reduce discomfort and achieve energy saving.

[Brief description of the drawings]

FIG. 1 shows a block configuration diagram of a first embodiment according to the present invention.

FIG. 2 shows an operation waveform diagram of the above embodiment.

FIG. 3 shows a second operation waveform chart according to the embodiment.

FIG. 4 shows a third operation waveform diagram according to the embodiment.

FIG. 5 shows a block diagram of a second embodiment according to the present invention.

FIG. 6 shows an operation waveform diagram of the embodiment.

FIG. 7 shows a second operation waveform chart according to the embodiment.

FIG. 8 shows a third operation waveform chart according to the embodiment.

FIG. 9 shows a fourth operation waveform chart according to the embodiment.

FIG. 10 shows an operation waveform diagram of a conventional example according to the present invention.

FIG. 11 shows a second operation waveform diagram according to the conventional example.

FIG. 12 shows a third operation waveform diagram according to the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brightness detection means 2 Illumination part 3 Control part

Claims (10)

[Claims] An illumination unit having a light source and lighting means for lighting the light source; a brightness detection means for detecting the illuminance of the surface to be illuminated; A control unit that controls the light output of the light source in a direction in which the illuminance falls within a target range, wherein the control unit sets the detection value within the target range when the detection value reaches the target range. A lighting device for maintaining a dimming level of the light source when the lighting device reaches the lighting device. 2. An illumination unit having a light source and a lighting means for lighting the light source, a brightness detection means for detecting illuminance on the surface to be illuminated, and a light receiving means for receiving the value detected by the brightness detection means. A control unit that controls the light output of the light source in a direction in which the illuminance falls within a target range, wherein the control unit sets the detection value to a target value when the detection value increases and exceeds a target lower limit value. A lighting device for maintaining a dimming level of the light source when the light source value is equal to or more than a lower limit value. 3. An illumination unit having a light source and lighting means for lighting the light source, a brightness detection means for detecting illuminance on the surface to be illuminated, and a light receiving means for receiving the value detected by the brightness detection means. A control unit for controlling the light output of the light source in a direction in which the illuminance is within a target range, wherein the control unit sets the detection value to a target value when the detection value decreases to a target upper limit value or less. A lighting device for maintaining a dimming level of the light source when the light source value falls below a lower limit value. 4. The lighting device according to claim 1, further comprising a measurement section for measuring an integrated average value of the detection values. 5. The lighting device according to claim 4, wherein a dimming level of the light source is substantially constant in the measurement section. 6. The method according to claim 4, wherein when the integrated average value is different from the target range, the process shifts from the measurement section to a correction section for correcting a dimming level of the light source. Lighting equipment. 7. The lighting device according to claim 6, wherein the dimming level of the light source changes stepwise in the correction section. 8. The lighting device according to claim 1, wherein a length of the measurement section changes according to the detected value. 9. The lighting device according to claim 1, wherein a dimming level correction amount of the light source in the correction section changes according to the detection value. 10. The illumination according to claim 1, wherein a dimming level change amount of the light source per unit time in the correction section changes according to the detection value. apparatus.