JPH10270176A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save the labor of illuminance adjustment for each setting work so as to easily provide desired illuminance by storing the thresh level value of an illuminance sensor in a memory according to the target illuminance value of a surface to be illuminated by a target luminance setting means and the sensitivity value of the illuminance sensor by an illuminance sensor sensitivity switching means. SOLUTION: The illuminance of a surface to be illuminated is detected by an illuminance sensor 1 and outputted to a control unit composed of a microcomputer 7. On the other hand, the thresh level value of the illuminance sensor 1 is stored in a memory 8 according to the target illuminance value of the surface to be illuminated set by a set illuminance switch SW10 and the sensitivity value of the illuminance sensor 1 set by an illuminance sensor sensitivity switch SW9. With the control unit, the illuminance value of the illuminance sensor 1 is compared with the stored thresh level value and then the load output of an illuminator 6 is controlled. Further, preferably, the illuminance sensor 1 increases its sensitivity as a target illuminance is lower or the reflectance ratio of the surface to be illuminated is lower, and thus its light receiving surface area is preferably made variable.

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 having an illuminance sensor for detecting light reflected from a surface to be illuminated and controlling the light output of an illumination load. The present invention relates to a lighting device that performs feedback control.

[0002]

2. Description of the Related Art FIG. 12 is a block diagram showing a conventional example according to the present invention, and FIG.

In this configuration, the output of the illuminance sensor 1 detecting the reflected light on the surface to be illuminated (for example, the surface to be illuminated), the sensitivity value of the illuminance sensor 1 set by the illuminance sensor sensitivity switching means 3, and the illuminance adjustment On the basis of the illuminance value of the surface to be illuminated set by the means 4, the dimming signal 5 transmitted from the control unit 2 causes the illumination load (hereinafter referred to as illumination) so that the detection value of the illuminance sensor 1 becomes substantially constant. This is for controlling the light output of 6. As shown in the block diagram of FIG. 14, the sensitivity value of the illuminance sensor 1 is selected by turning on / off the illuminance sensor sensitivity switching unit 3, and the set illuminance value is set by adjusting the volume of the illuminance adjustment unit 4.

Next, a flowchart shown in FIG. 13 and FIG.
The operation of the conventional example will be briefly described based on the block diagram shown in FIG.

[0005] The detection value of the illuminance sensor 1 that has detected the reflected light on the illuminated surface is compared with the set value of the illuminance adjustment means 4, and if the detected value of the illuminance sensor 1 is larger than the set value of the illuminance adjustment means 4, The dimming ratio of the illumination 6 is reduced, and if the detected value of the illuminance sensor 1 matches the set value of the illuminance adjusting means 4, the dimming ratio of the illumination 6 is maintained, and the detected value of the illuminance sensor 1 is changed to the illuminance adjusting means. If it is smaller than the set value of 4, the dimming ratio of the illumination 6 is increased, and the light output of the illumination 6 is controlled so that the detection value of the illuminance sensor 1 substantially matches the set value of the illuminance adjustment means 4.

Here, the control unit 2 includes resistors R1 to R5 and comparators Comp1 and C2 as shown in a circuit diagram of FIG.
The circuit may be composed of omp2, a photodiode pd, and a switch SW. In this circuit, the amplification factor of the operational amplifier is changed by turning on and off the switch SW. When the illuminated surface has a low reflectance, the switch SW is turned on to increase the sensitivity of the illuminance sensor 1 as shown in FIG. 16A, and when the illuminated surface has a high reflectance, FIG. (B)
The switch SW is turned off to lower the sensitivity of the illuminance sensor 1 as shown in FIG.

[0007]

However, in the above-mentioned conventional example, it is necessary to perform adjustment by the illuminance adjusting means 4 for each setting operation in order to obtain a desired illuminance, and the work of changing the target illuminance becomes complicated. In addition, since the setting result is not stored, the reproducibility of the illuminance is low.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the time and effort required to obtain a desired illuminance and to easily obtain a desired illuminance. It is to provide a device.

[0009]

According to the first aspect of the present invention, there is provided an illuminance sensor for detecting the illuminance of a surface to be illuminated, and an illuminance load receiving the output of the illuminance sensor. A control unit for controlling the light output, a target illuminance setting unit for setting a target illuminance of the illuminated surface, and an illuminance sensor sensitivity switching unit for switching the sensitivity of the illuminance sensor, a target illuminance value set by the target illuminance setting unit And a storage unit for storing a threshold level value of the illuminance sensor in accordance with the sensitivity value set by the illuminance sensor sensitivity switching unit.

According to the invention described in claim 2, the illuminance sensor is characterized in that the sensitivity increases as the target illuminance decreases.

According to the third aspect of the invention, the illuminance sensor is characterized in that the lower the reflectance of the illuminated surface, the higher the sensitivity.

According to a fourth aspect of the present invention, a change means for changing the light receiving surface area of the illuminance sensor is provided.

According to a fifth aspect of the present invention, an initial illuminance correction means for correcting the initial illuminance of the illuminated surface is provided.

[0014]

Embodiment

(Embodiment 1) FIG. 1 shows a block diagram of a first embodiment according to the present invention.

The difference from the conventional example shown in FIG. 12 is that instead of the control unit 2, the illuminance sensor sensitivity switching unit 3, and the illuminance adjustment unit 4, a storage unit for storing the threshold level of the illuminance sensor 1 (hereinafter, referred to as a storage unit). 8, an illuminance sensor sensitivity switch SW9 for switching the sensitivity of the illuminance sensor 1, and a set illuminance switch SW10 for switching the set illuminance of the irradiated surface.
And the detection value of the illuminance sensor 1 becomes substantially constant based on the detection value of the illuminance sensor 1, the data stored in the memory 8, the set value of the illuminance sensor sensitivity switch SW9, and the set value of the set illuminance switch SW10. A microcomputer (hereinafter, referred to as a microcomputer) 7 for controlling the light output of the illumination 6 is provided in the same manner as described above.

When the reflected light from the illuminated surface is detected by the illuminance sensor 1 provided on the ceiling surface or the like, the illuminance near the illuminance sensor 1 changes depending on the reflectance of the illuminated surface.
Thus, if the reflectance of the illuminated surface is 10%, the illuminance near the illuminance sensor 1 is 100 lx even if the illuminated surface is 1000 lx. Also, the lower the reflectance of the irradiated surface,
When the detection accuracy of the illuminance sensor 1 is improved by setting the sensitivity of the illuminance sensor 1 to be high, for example, from FIG. 3, the reflectance is 10% and the illuminance near the illuminance sensor 1 is 1
If it is 00lx, the output voltage of the illuminance sensor 1 (hereinafter, referred to as a threshold level) is 5V.

Table 1 shows that each of the scales 1, 2, 3, 4, and 5 of the set illuminance switch SW10 has a reflectance of 10% and a reflectance of 20%.
%, 30%, 40%, and 50%, and the set illuminance was set to 200, 300, 400... 1000 for each of the graduations 1, 2, 3,. In this case, the threshold level of the illuminance sensor 1 is shown.

[0018]

[Table 1]

In this embodiment, as shown in Table 1, the scale of the illuminance sensor sensitivity switch SW9 and the set illuminance switch SW10
The threshold level of the illuminance sensor 1 corresponding to the scale is stored in the memory 8.

The operation will be briefly described with reference to the flowchart shown in FIG. First, the illuminance sensor sensitivity switch SW9
Illuminance sensor sensitivity switch SW by setting the scale of
9 is read into the microcomputer 7 and then the set illuminance switch SW
Setting illuminance switch SW1 by setting 10 scales
The value of 0 is read into the microcomputer 7. From the memory 8, the threshold level value A of the illuminance sensor 1 corresponding to the scale set by the illuminance sensor sensitivity switch SW9 and the set illuminance switch SW10 is read. Then, the detection value B of the illuminance sensor 1 is read, and the value A is compared with the value B. Illumination 6 if value A <value B
, The light output of the illumination 6 is maintained if the value A = the value B, and the light output of the illumination 6 is increased if the value A> the value B.
The above operation is repeated, and the light output of the illumination 6 is controlled so that the value A and the value B become substantially constant.

With the above configuration, it is possible to save time and effort for obtaining a desired illuminance in accordance with the reflectance of the surface to be illuminated, and to easily obtain a desired illuminance.

The values to be stored in the memory 8, the set illuminance for each scale of the illuminance sensor sensitivity switch SW9, and the setting of the reflectance for each graduation of the set illuminance switch SW10 are arbitrarily selected according to the use and location. For example, the threshold value A may be set to be different for each reflectance at the same set illuminance. Also,
The illuminance sensor 1 includes, for example, as shown in FIG.
2, R4, R6 to R8... And comparators Comp1, Co
It may be composed of mp2 and a photodiode pd, and may correspond to the reflectance of the illuminated surface by changing the amplification factor, or may have another configuration. Further, as shown in FIG. 6, the sensitivity of the illuminance sensor 1 may be set more finely.
By setting in this way, it is possible to more finely correspond to the reflectance of the irradiated surface. Furthermore, the inclination of the sensitivity of the illuminance sensor 1 may be changed as shown in FIG.

(Embodiment 2) A second embodiment according to the present invention will be described below.

The difference from the first embodiment shown in FIG. 1 is that the illuminance sensor 1 is used in accordance with each reflectance in order to cope with different reflectances of the illuminated surface without changing the sensitivity setting of the illuminance sensor 1. 1 is provided with a changing means for changing the amount of received light. The same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

That is, for example, when the threshold level of the illuminance sensor 1 is set so as to have a sensitivity corresponding to the reflectivity of 30%, the illuminance of the illuminance sensor 1 is increased by 0.6 times the light receiving surface area. The light receiving amount of the sensor 1 can be changed, so that the threshold level can be changed so as to have a sensitivity corresponding to the reflectance of 50% without changing the sensitivity setting of the illuminance sensor 1. In order to change the light receiving surface area of the illuminance sensor 1, for example, FIG.
Although there is a means for providing a light-shielding plate as shown in (c), other means may be used.

(Embodiment 3) FIG. 10 is a block diagram of a third embodiment according to the present invention, and FIG. 11 is a flowchart thereof.

A difference from the first embodiment shown in FIG. 1 is that an illumination light output 70% SW11 for dimming and lighting the illumination 6 by 70% is provided in order to perform initial illuminance correction. The same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

The operation will be briefly described below with reference to FIG. The scale of the illuminance sensor sensitivity switch SW9 is set in advance according to the reflectance of the irradiated surface. Then, when the illumination light output 70% SW 11 is turned on, the illumination 6 is dimmed and turned on by 70%, and the threshold level A of the illuminance sensor 1 at that time is stored in the memory 8. Illuminance sensor 1 stored in memory 8
Is compared with the detection value B of the illuminance sensor 1, and if the value A <the value B, the light output of the illumination 6 is reduced,
If the value A = the value B, the light output of the illumination 6 is maintained, and if the value A> the value B, the light output of the illumination 6 is increased. The above operation is repeated, and the light output of the illumination 6 is controlled so that the value A and the value B become substantially constant.

With this configuration, an energy saving effect can be obtained. In the present embodiment, the illumination 6
Although the threshold level value A of the illuminance sensor 1 for performing 70% dimming lighting is stored in the memory 8, dimming lighting may be performed at another dimming ratio instead of 70% dimming lighting. Further, the threshold level A of the illuminance sensor 1 may be determined in consideration of the maintenance rate of the apparatus.

[0030]

According to the first to fourth aspects of the present invention, it is possible to provide a lighting device capable of easily obtaining a desired illuminance by saving time and effort for obtaining a desired illuminance.

According to the fifth aspect of the present invention, it is possible to provide a lighting device capable of obtaining an energy saving effect in addition to the effects of the first to fourth aspects of the present invention.

[Brief description of the drawings]

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

FIG. 2 is a characteristic diagram showing illuminance near an illuminance sensor 1 with respect to illuminance of an illuminated surface for each reflectance of the illuminated surface according to the embodiment.

FIG. 3 is a characteristic diagram showing an output voltage of the illuminance sensor 1 with respect to illuminance near the illuminance sensor 1 for each reflectance of a surface to be illuminated according to the embodiment.

FIG. 4 shows a flowchart according to the embodiment.

FIG. 5 shows an example of a circuit diagram of the illuminance sensor 1 according to the embodiment.

FIG. 6 is another characteristic diagram showing the output voltage of the illuminance sensor 1 with respect to the illuminance near the illuminance sensor 1 for each reflectance of the illuminated surface according to the embodiment.

FIG. 7 is still another characteristic diagram showing the output voltage of the illuminance sensor 1 with respect to the illuminance near the illuminance sensor 1 for each reflectance of the irradiated surface according to the embodiment.

FIG. 8 is a characteristic diagram showing an output voltage of the illuminance sensor 1 with respect to the illuminance near the illuminance sensor 1 according to the second embodiment of the present invention.

FIG. 9 is a schematic diagram showing a light receiving surface of the illuminance sensor 1 according to the embodiment.

FIG. 10 shows a block diagram of a second embodiment according to the present invention.

FIG. 11 shows a flowchart according to the embodiment.

FIG. 12 shows a block diagram of a conventional example according to the present invention.

FIG. 13 shows a flowchart according to the conventional example.

FIG. 14 shows a block diagram of a control unit 2 according to the conventional example.

FIG. 15 shows an example of a circuit diagram of a control unit 2 according to the conventional example.

FIG. 16 is a characteristic diagram showing an output voltage of the illuminance sensor 1 with respect to the illuminance near the illuminance sensor 1 according to the conventional example.

[Explanation of symbols]

 Reference Signs List 1 illuminance sensor 6 illumination 8 storage means 9 illuminance sensor sensitivity switching SW 10 setting illuminance switching SW

Claims (5)

[Claims] 1. An illuminance sensor for detecting illuminance on a surface to be illuminated, a control unit for controlling the light output of an illumination load in response to an output of the illuminance sensor, and a target illuminance setting means for setting a target illuminance on the surface to be illuminated. And an illuminance sensor sensitivity switching means for switching the sensitivity of the illuminance sensor, according to a target illuminance value set by the target illuminance setting means and a sensitivity value set by the illuminance sensor sensitivity switching means. A lighting device, further comprising storage means for storing a threshold level value of the illuminance sensor. 2. The lighting device according to claim 1, wherein the illuminance sensor has a higher sensitivity as the target illuminance is lower. 3. The illumination device according to claim 1, wherein the illuminance sensor has a higher sensitivity as the reflectance of the illuminated surface is lower. 4. The illuminating device according to claim 1, further comprising changing means for changing an area of a light receiving surface of the illuminance sensor. 5. The illuminating device according to claim 1, further comprising an initial illuminance correction unit for correcting an initial illuminance of the surface to be illuminated.