JP2001345186A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a change in light from a light source other than a lamp. SOLUTION: This lighting system is provided with a lamp 1 for throwing the light to an object surface, a lighting circuit 2 for lighting the lamp 1, two brightness sensors 3A and 3B having mutually different spectral sensitivity characteristics and detecting brightness of the object surface by receiving the reflected light from the object surface and a control part 4 for varying light output of the lamp 1 by controlling the lighting circuit 2 by a dimmer signal corresponding to the light output level of the lamp 1. Since the brightness of the object surface is detected by the brightness sensors 3A and 3B having the mutually different spectral sensitivity characteristics, a change in the light output level of the external light can be detected, and the control part 4 can judge whether or not to be able to determine the corresponding relation of the brightness of the irradiating object surface to the light output level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention improves energy saving and convenience by controlling the light output of a lamp installed in an office, a store, or the like so that the brightness of a surface to be irradiated coincides with a target value. And a lighting device.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. Hei.
There is one described in JP-A-270176. In this conventional example, a brightness sensor that detects the brightness of a surface to be illuminated, a microcomputer that controls the light output of a lighting load in response to the output of the brightness sensor, and a set illuminance switch that sets a target value of the surface to be illuminated A switch, a brightness sensor sensitivity switch for switching the sensitivity of the brightness sensor, and a threshold value of the brightness sensor according to a target value set by the set illuminance switch and a sensitivity value set by the brightness sensor sensitivity switch. And a memory for storing a value. In this conventional example, the threshold level value of the brightness sensor corresponding to the scale set by the brightness sensor sensitivity changeover switch and the set illuminance changeover switch is read from the memory and compared with the detected value of the brightness sensor, and the magnitude relation between the two is read. By controlling the light output of the lighting load according to the condition, the illuminance of the illuminated surface can be set to the target value almost accurately in the absence of external light such as sunlight, and the brightness sensor at that time can be set. The gain of the brightness sensor can be automatically changed so that the output becomes an appropriate value.

[0003]

However, in the actual market, there is a demand for a simple and automatic setting of the target value regardless of the presence or absence of external light even if the accuracy of the set illuminance that can be achieved is reduced. is there. A lighting device that meets such a demand is disclosed in Japanese Patent Application Laid-Open No. H11-214179. In the conventional example described in the publication, for example, a lighting load is rated (100% lighting).
The light output is obtained from the detected value α of the brightness sensor when the lighting is performed and the detected value β of the brightness sensor when the dimming operation is performed at the light output level of 25% when the lighting load is set to 100%. Of the brightness sensor with respect to 1% of A (= (α−
β) / (100-25)), that is, the straight line L1 in FIG.
Is calculated, and the detection value of the brightness sensor when the light output level is set to a desired level X (for example, 70%) is 70 ×
A is calculated and stored from A, and the detection value of the brightness sensor is 70 ×
If the lighting load is controlled so as to substantially coincide with A, it is possible to set the brightness when the lighting load is turned on at a desired light output level regardless of the presence or absence of external light. That is, if the light output level of the external light does not change between when the lighting load is turned on at 100% and when the lighting load is turned on at 25%, 100 when the external surface is not irradiated with the external light (the straight line L1 in FIG. 14).
The difference α between the detected value α at% lighting and the detected value β at 25% lighting
−β and the difference α′−β ′ between the detection value α ′ at the time of 100% lighting and the detection value β ′ at the time of 25% lighting when the external light is irradiated (the straight line L2 in FIG. 14) match. (Α−β = α ′
−β ′), it is possible to easily and automatically set a target value (a detection value of a brightness sensor when a lighting load is turned on at a desired light output level) regardless of the presence or absence of external light.

[0004] However, as shown in FIG.
Light output levels V1 and V of external light at% lighting and 25% lighting
2 changes, the difference α−β between the detection value α at the time of 100% lighting and the detection value β at the time of 25% lighting when the external surface is not irradiated with the external light (the straight line L1 in FIG. 15), 100% of the case where light is irradiated (straight line L2 in FIG. 15)
The difference α′−β ′ between the detection value α ′ at the time of lighting and the detection value β ′ at the time of 25% lighting does not match (α−β ≠ α′−
β '). As a result, even if the detection value A of the brightness sensor for 1% of the light output is obtained, the value becomes different from the case where there is no external light, and the brightness sensor detects when the lighting load is turned on at a desired light output level. There is a problem that the value deviates from an accurate value, and the setting accuracy of the target value decreases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an illuminating device capable of detecting a change in light emitted from a light source other than a lamp. is there.

[0006]

In order to achieve the above object, a first aspect of the present invention provides a lamp for irradiating a surface to be irradiated with light, a lighting circuit for lighting the lamp, and different spectral sensitivity characteristics. A plurality of brightness sensors for detecting the brightness of the illuminated surface by receiving the reflected light from the illuminated surface, and controlling the lighting circuit by a dimming signal corresponding to the light output level of the lamp to control the lamp A control unit for varying the light output of the lamp, the control unit outputs a dimming signal so that the light output of the lamp is a plurality of different levels, controls the lighting circuit unit, and for each light output level The correspondence between the brightness of the illuminated surface and the light output level is determined from the detection output difference and the light output level difference of each brightness sensor, and a target value of the brightness of the illuminated surface is set from the obtained correspondence. , Almost match the set target value Characterized by outputting to the lighting circuit unit to the dimming signal for the light source other than the lamp by the spectral sensitivity characteristics different brightness sensor can detect the change of light irradiation.

According to a second aspect of the present invention, in the first aspect, the plurality of brightness sensors have a spectral sensitivity characteristic having substantially the same sensitivity to at least a wavelength range of light emitted by the lamp. Calculates the correspondence between the light output level and the brightness of the illuminated surface when the detected output difference of each brightness sensor with respect to each light output level substantially matches. It is determined that the light emitted by the light source has changed, and the same effect as the invention of claim 1 is exerted.

According to a third aspect of the present invention, in the first aspect of the invention, the plurality of brightness sensors are a first brightness sensor having sensitivity in a wavelength range of light irradiated by the lamp, A second brightness sensor having no sensitivity in a wavelength range and having a sensitivity in a wavelength range of light emitted by a light source other than a lamp, wherein the control unit includes a second brightness sensor for each light output level. If the detected output differences between the two substantially match, the correspondence between the light output level and the brightness of the irradiated surface is determined. If the detected output difference from the second brightness sensor is different, the light emitted by a light source other than the lamp is used. Is determined to have changed, and the same operation as the invention of claim 1 is achieved.

According to a fourth aspect of the present invention, in the second or third aspect, when the control unit determines that the light emitted from the light source other than the lamp has changed, the control unit notifies the user of the change. As a feature, in addition to the effect of the invention of claim 1,
The notification by the notification means makes it possible to determine whether or not the setting of the target value can be accurately performed by obtaining the correspondence between the light output level and the brightness of the irradiated surface.

According to a fifth aspect of the present invention, in the second or third aspect of the present invention, when the control unit determines that the light emitted by the light source other than the lamp has changed, the brightness of the irradiated surface with respect to the light output level is again determined. In addition to the operation of the first aspect of the present invention, a target value can be set with high accuracy based on the correspondence between the light output level and the brightness of the irradiated surface.

According to a sixth aspect of the present invention, in the second or third aspect of the present invention, when the control section determines that the light emitted from the light source other than the lamp has changed, the control section notifies the user of the change and re-outputs the light. A process for obtaining a correspondence relationship between the level and the brightness of the illuminated surface. In addition to the operation of the invention of claim 1, the brightness of the illuminated surface with respect to the light output level is notified by the notification means. It is possible to determine whether or not the target value can be set with high accuracy by obtaining the corresponding relationship, and to set the target value with high accuracy based on the correspondence between the light output level and the brightness of the irradiated surface.

A seventh aspect of the present invention is characterized in that, in any one of the first to sixth aspects, the lamp is a fluorescent lamp, and has the same effect as any of the first to sixth aspects.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the light source other than the lamp includes the sun. Play.

According to a ninth aspect of the present invention, in any one of the first to eighth aspects of the present invention, the control unit determines the correspondence between the light output level and the brightness of the illuminated surface. A dimming signal is output so that one of the levels is set to the rated level of the lamp, and the same operation as the invention according to any one of claims 1 to 8 is achieved.

According to a tenth aspect of the present invention, in any one of the first to ninth aspects of the present invention, the control unit determines the correspondence between the light output level and the brightness of the illuminated surface. 2. The method according to claim 1, wherein the dimming signal is output so that one of the levels is a level of about 25% when expressed as a ratio to a rated level of the lamp.
The present invention has the same effect as any of the ninth inventions.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) As shown in FIG. 1, a lighting device according to the present embodiment includes a lamp 1 for irradiating light to a surface to be illuminated, a lighting circuit unit 2 for lighting the lamp 1, and Two brightness sensors 3A and 3B that have different spectral sensitivity characteristics and detect the brightness of the irradiated surface by receiving reflected light from the irradiated surface, and a dimming signal corresponding to the light output level of the lamp 1 And a control unit 4 that controls the lighting circuit unit 2 to vary the light output of the lamp 1.

The lighting circuit section 2 dims and lights the lamp 1 by varying the power supplied to the lamp 1 in accordance with a dimming signal supplied from the control section 4. The lighting circuit section 2 uses a conventionally known inverter circuit. Is achieved. The control unit 4 has a microcomputer as a main component, executes a program stored in advance to perform processing as described below, and controls the lighting circuit unit 2 so that the brightness of the irradiated surface matches the target value. To output a dimming signal.

In the present embodiment, a neutral white three-band emission fluorescent lamp (EX-N) having a spectral distribution characteristic shown by a curve A in FIG. It should be noted that what is indicated by the curve B in the figure is the spectral distribution characteristic of external light (sunlight). Further, as shown by a curve C in FIG. 3, one brightness sensor 3A has a spectral distribution characteristic of the lamp 1 (curve A in FIG. 2).
, And has a spectral sensitivity characteristic similar to the relative luminous efficiency characteristic, and the other brightness sensor 3B corresponds to the spectral distribution characteristic of the external light (curve B in FIG. 2) as shown by a curve d in FIG. There is a distribution distribution characteristic in which the wavelength at which the sensitivity becomes maximum (hereinafter, referred to as “peak wavelength”) substantially coincides with the brightness sensor 3A and the sensitivity becomes higher on the longer wavelength side and the shorter wavelength side than the peak wavelength. are doing. That is, since the two brightness sensors 3A and 3B have spectral sensitivity characteristics having at least substantially the same sensitivity to the wavelength range of the light irradiated by the lamp 1, the light of the lamp 1 (hereinafter referred to as "artificial light") is used. ) Is irradiated on the surface to be irradiated, the detection values of the two brightness sensors 3A and 3B become substantially equal.

Next, referring to the flowchart of FIG.
A procedure for obtaining the correspondence between the light output level of the lamp 1 and the brightness of the irradiated surface (the detection values of the brightness sensors 3A and 3B) by the control unit 4 will be described. First, the control unit 4 outputs a dimming signal to the lighting circuit unit 3 to light the lamp 1 at the rated lighting (light output level 100%) (step 1), and detects the detected values α _A of the brightness sensors 3A and 3B at this time. , Α _B (step 2). Further, the control unit 4 outputs a dimming signal to the lighting circuit unit 3 to set the lamp 1 at a rated value of 100%.
Dimming lighting is performed at a light output level of 5% (step 3), and the detected values β _A and β _B of the brightness sensors 3A and 3B at this time are stored (step 4). Then, the control unit 4 compares the differences (α _A −β _A ) and (α _B −β _B ) between the detected values of the brightness sensors 3A and 3B during the rated lighting and the dimming lighting (Step 5). For example, if the light illuminating the surface to be irradiated is only artificial light, the sensitivity of the two brightness sensors 3A and 3B to the artificial light is almost equal, so the light in each of the brightness sensors 3A and 3B as shown in FIG. The straight lines L1 and L2 indicating the relationship between the output level and the detection values α and β almost coincide, and the difference between the detection values becomes equal (α _A −β _A = α _B −β _B = α−β). Alternatively, when not only the artificial light but also the external light is irradiated on the surface to be irradiated and the light output level of the external light hardly changes with time, as shown in FIG. , 3B are added to the detected values α ′ _A , α ′ _B , β ′ _A , and β ′ _B in accordance with the light output level of the external light. Here, since the two brightness sensors 3A and 3B have different sensitivities to external light, the added components θ _A , θ _B , φ _A , and φ _B are different for each of the brightness sensors 3A and 3B. Since the output level does not change with time, the above-mentioned increments during rated lighting and dimming lighting become equal (θ _A = θ _B , φ _A =
φ _B ). Therefore, the straight lines L1 ′, L2 ′ indicating the relationship between the light output levels of the brightness sensors 3A, 3B and the detection values α, β,
L2 'is a straight line obtained by translating the straight lines L1 and L2 in the positive direction of the vertical axis, and the difference between the detected values is also equal (α'
_A− β ′ _A = α ′ _B −β ′ _B = α−β). Therefore, regardless of whether external light is irradiating the surface to be irradiated, if the difference between the detected values of the brightness sensors 3A and 3B at the time of rated lighting and at the time of dimming lighting is the same, the description has been given in the conventional example. Thus, the target value can be automatically set (step 6).

On the other hand, when the light output level of the external light irradiating the surface to be illuminated changes with time, the detected values α ″ _A , α ″ _{B of the} brightness sensors 3A, 3B as shown in FIG. ,
The added components θ ′ _A , θ ′ _B , φ ′ _A , and φ ′ _B according to the light output level of the external light added to β ″ _A and β ″ _B respectively, Because of the change, it differs between rated lighting and dimming lighting (θ ′ _A ≠ θ ′ _B , φ ′
_A ≠ φ ' _B ). Therefore, the slopes of the straight lines L1 "and L2" indicating the relationship between the light output levels and the detection values α "and β" in the brightness sensors 3A and 3B do not match, and the difference between the detection values differs (α "). _A −β ” _A ≠ α” _B −β ” _B ≠ α−
β). Therefore, if the difference between the detected values at the time of rated lighting and at the time of dimming lighting does not match, the control unit 4 determines that it is difficult to accurately set the target value and that an error has occurred in the processing result (step 7).

As described above, in this embodiment, since the brightness of the illuminated surface is detected by the brightness sensors 3A and 3B having different spectral sensitivity characteristics, a change in the light output level of external light is detected. This makes it possible to determine whether or not it is possible to obtain the correspondence between the light output level and the brightness of the irradiated surface. Here, if the control unit 4 determines that it is difficult to set the target value accurately and an error occurs in the processing result, the above processing may be repeated again, and the brightness of the irradiated surface with respect to the light output level may be adjusted. There is an advantage that the target value can be set with high accuracy based on the correspondence relationship. In the present embodiment, when determining the correspondence of the brightness of the irradiated surface to the light output level, the lamp 1 is turned on 25% after the rated lighting, but is not limited to this. What is necessary is just to light up with several different light output levels.

(Embodiment 2) Since the configuration of this embodiment is the same as that of Embodiment 1, illustration and description are omitted.

In this embodiment, one of the brightness sensors 3A
Has a spectral sensitivity characteristic corresponding to the spectral distribution characteristic of the lamp 1 (curve a in FIG. 8) and similar to the relative luminous efficiency characteristic, as indicated by the curve E in FIG. 8, and the other brightness sensor 3B has the same characteristic. As shown by the curve in the figure, the peak wavelength is on the longer wavelength side than the spectral distribution characteristic of the lamp 1 and has a distribution distribution characteristic that does not intersect with the spectral sensitivity characteristic of the brightness sensor 3A. That is, one brightness sensor 3A has a spectral sensitivity characteristic having sensitivity to the wavelength range of the light emitted from the lamp 1, and the other brightness sensor 3B has sensitivity to the wavelength range of the light emitted from the lamp 1. And has sensitivity only to the wavelength range of external light.

Next, referring to the flowchart of FIG.
A procedure for obtaining the correspondence between the light output level of the lamp 1 and the brightness of the irradiated surface (the detection values of the brightness sensors 3A and 3B) by the control unit 4 will be described. First, the control unit 4 outputs a dimming signal to the lighting circuit unit 3 to light the lamp 1 at the rated lighting (light output level 100%) (step 1), and detects the detected values α _A of the brightness sensors 3A and 3B at this time. , Α _B (step 2). Further, the control unit 4 outputs a dimming signal to the lighting circuit unit 3 to set the lamp 1 at a rated value of 100%.
Dimming lighting is performed at a light output level of 5% (step 3), and the detected values β _A and β _B of the brightness sensors 3A and 3B at this time are stored (step 4). Then, the control unit 4 compares the detection values α _B and β _B of the brightness sensor 3B during the rated lighting and the dimming lighting (Step 5). For example, if the light to irradiate the irradiated surface is only artificial light, the sensitivity of one of the brightness sensors 3B to the artificial light is almost equal to zero, and thus the detection value α of the brightness sensor 3B as shown in FIG. _{B, β B} is zero. Alternatively, if not only the artificial light but also the external light is illuminating the irradiated surface and the light output level of the external light hardly changes with time, one of the brightness sensors as shown in FIG. The detected value α ′ _A , β ′ _A of 3A is added to the value according to the light output level of the external light, and the detected value α ′ _B , β ′ _{B of} the other brightness sensor 3B is set to a non-zero positive value. Become. Here, since the light output level of the external light does not change with time, the detection values α ′ _B and β ′ _B of the brightness sensor 3B at the time of rated lighting and at the time of dimming lighting match (α ′).
_B = β ′ _B ). In addition, the above increments θ _A and φ _A at the time of rated lighting and the time of dimming lighting of the brightness sensor 3A become equal (θ
_A = _{φ A).} Therefore, the detection values of the brightness sensor 3B are also equal (α ′ _B = β ′ _B ), and the brightness sensor 3B
A straight line L2 'indicating the relationship between the light output level and the detected value α at B is a straight line having a zero slope parallel to the horizontal axis. Therefore, regardless of whether external light is irradiating the irradiated surface,
If the detected values of the brightness sensor 3B at the time of rated lighting and at the time of dimming lighting match, the target value can be automatically set as described in the conventional example (step 6).

On the other hand, when the light output level of the external light applied to the surface to be illuminated changes with time, it is added to the detection values α ″ _A and β ″ _A of the brightness sensor 3A as shown in FIG. The added components θ ′ _A and φ ′ _A according to the light output level of the outside light differ between the rated lighting and the dimming lighting because the light output level of the outside light changes with time. 3B
Also, the detection values at the time of rated lighting and at the time of dimming lighting differ from each other (α ″ _B ≠ β ″ _B ). Therefore, the straight line L indicating the relationship between the light output level and the detection value α ″ in the brightness sensor 3B
2 ”is a straight line having an inclination that is not parallel to the horizontal axis. Therefore, if the detected values of the brightness sensor 3B during rated lighting and during dimming lighting do not match, the control unit 4 sets the target value accurately. It is difficult to perform the process, and it is determined that an error has occurred in the processing result (step 7).

As described above, in this embodiment, as in the first embodiment, the brightness of the illuminated surface is detected by the brightness sensors 3A and 3B having different spectral sensitivity characteristics. A change in the level can be detected, and it is possible to determine whether or not it is possible to obtain the correspondence between the light output level and the brightness of the irradiated surface. Here, the control unit 4
If it is determined that it is difficult to set the target value accurately and an error has occurred in the processing result, the above processing may be repeated and may be performed based on the correspondence relationship between the light output level and the brightness of the irradiated surface. There is an advantage that the target value can be set with high accuracy. In the present embodiment, when determining the correspondence of the brightness of the irradiated surface to the light output level, the lamp 1 is turned on 25% after the rated lighting, but is not limited to this. What is necessary is just to light up with several different light output levels.

(Embodiment 3) As shown in FIG. 13, the lighting apparatus of the present embodiment includes a light emitting diode, a buzzer, and the like in addition to the configuration of Embodiment 1, and the brightness of the illuminated surface with respect to the light output level. When the control unit 4 determines that the external light has changed during the processing for obtaining the correspondence, the control unit 4 is provided with a notification unit 5 for notifying the determination.

The control unit 4 according to the first or second embodiment accurately sets the target value because the external light changes during the process of obtaining the correspondence between the light output level and the brightness of the irradiated surface. When it is determined that it is difficult to perform the processing, an error is output to the notification unit 5 when it is determined that an error has occurred in the processing result. The notification unit 5 receiving this error occurrence signal,
The light emitting diode is turned on or off, or a buzzer sounds to notify that an error has occurred. By notifying the occurrence of an error by the notifying unit 5 in this manner, it is possible to determine the correspondence between the light output level and the brightness of the irradiated surface and determine whether or not the target value can be set with high accuracy. Here, when the control unit 4 determines that an error has occurred, an error occurrence signal may be output, and the above-described processing may be repeated again, and the correspondence between the light output level and the brightness of the irradiated surface may be determined. There is an advantage that the target value can be set with high accuracy.

[0029]

According to the first aspect of the present invention, there is provided a lamp for irradiating a surface to be irradiated with light, a lighting circuit for lighting the lamp, and receiving reflected light from the surface to be irradiated having different spectral sensitivity characteristics. A plurality of brightness sensors that detect the brightness of the irradiated surface, and a control unit that controls the lighting circuit unit with a dimming signal corresponding to the light output level of the lamp to vary the light output of the lamp, The control unit outputs a dimming signal to control the light output of the lamp to a plurality of different levels, controls the lighting circuit unit, and detects a difference between the detected output difference of each brightness sensor for each light output level and the light output. From the level difference between the light output level and the brightness of the illuminated surface, the target value of the brightness of the illuminated surface is set based on the obtained relationship, and the brightness is adjusted to substantially match the set target value. Output optical signal to lighting circuit It is characterized by a light source other than the lamp by the spectral sensitivity characteristics different brightness sensor is an effect that it is possible to detect the change of light irradiation.

According to a second aspect of the present invention, in the first aspect of the invention, the plurality of brightness sensors have spectral sensitivity characteristics having substantially the same sensitivity at least to the wavelength range of the light emitted by the lamp. Calculates the correspondence between the light output level and the brightness of the illuminated surface when the detected output difference of each brightness sensor with respect to each light output level substantially matches. It is determined that the light emitted by the light source has changed, and the same effect as the invention of claim 1 is achieved.

According to a third aspect of the present invention, in the first aspect of the present invention, the plurality of brightness sensors are a first brightness sensor having sensitivity in a wavelength range of the light irradiated by the lamp, and a plurality of brightness sensors. A second brightness sensor having no sensitivity in a wavelength range and having a sensitivity in a wavelength range of light emitted by a light source other than a lamp, wherein the control unit includes a second brightness sensor for each light output level. If the detected output differences between the two substantially match, the correspondence between the light output level and the brightness of the irradiated surface is determined. If the detected output difference from the second brightness sensor is different, the light emitted by a light source other than the lamp is used. Is determined to have changed, and the same effect as that of the invention of claim 1 is achieved.

According to a fourth aspect of the present invention, in the second or third aspect of the present invention, when the control unit determines that the light emitted from the light source other than the lamp has changed, the control unit notifies the user of the change. Features, in addition to the effect of the invention of claim 1,
The notification by the notification means has an effect that it is possible to determine whether the setting of the target value can be performed with high accuracy by obtaining the correspondence between the light output level and the brightness of the irradiated surface.

According to a fifth aspect of the present invention, in the second or third aspect of the present invention, when the control unit determines that the light emitted from the light source other than the lamp has changed, the brightness of the illuminated surface with respect to the light output level is again determined. In addition to the effect of the first aspect of the present invention, a target value based on the correspondence between the light output level and the brightness of the irradiated surface can be accurately set. is there.

According to a sixth aspect of the present invention, in the second or third aspect, when the control section determines that the light emitted from the light source other than the lamp has changed, the control section informs the fact and outputs the light again. Processing for obtaining a correspondence relationship between the level and the brightness of the illuminated surface. In addition to the effect of the invention according to claim 1, the brightness of the illuminated surface with respect to the light output level is notified by the notification means. The effect is that it is possible to determine whether or not the target value can be set with high accuracy by obtaining the correspondence between the target and the target value based on the correspondence between the light output level and the brightness of the irradiated surface. There is.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the lamp is a fluorescent lamp, and the same effects as those of the first to sixth aspects can be obtained.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the light source other than the lamp includes the sun, and the same effect as any of the first to seventh aspects is obtained. Play.

According to a ninth aspect of the present invention, in the processing of any one of the first to eighth aspects, the control section determines a correspondence relationship between the light output level and the brightness of the illuminated surface. A dimming signal is output so that one of the levels is set to the rated level of the lamp, and the same effects as those of any of the first to eighth aspects of the invention are obtained.

According to a tenth aspect of the present invention, in any one of the first to ninth aspects of the present invention, the control unit determines the correspondence between the light output level and the brightness of the illuminated surface. 2. The method according to claim 1, wherein the dimming signal is output so that one of the levels is a level of about 25% when expressed as a ratio to a rated level of the lamp.
The same effect as that of any one of the inventions 9 is achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment.

FIG. 2 is a diagram illustrating spectral distribution characteristics of artificial light and external light.

FIG. 3 is a diagram showing a spectral sensitivity characteristic of the brightness sensor in the first embodiment.

FIG. 4 is a flowchart for explaining the operation of the above.

FIG. 5 is an operation explanatory diagram in the case where there is no external light as in the above.

FIG. 6 is an operation explanatory diagram in the case where there is external light which does not change with time according to the above.

FIG. 7 is an operation explanatory diagram in the case where there is time-varying external light as in the above.

FIG. 8 is a diagram illustrating spectral sensitivity characteristics of a brightness sensor according to the second embodiment.

FIG. 9 is a flowchart for explaining the same operation.

FIG. 10 is an operation explanatory diagram in the case where there is no external light as described above.

FIG. 11 is an operation explanatory diagram in the case where there is external light which does not change with time according to the above.

FIG. 12 is an operation explanatory diagram in the case where there is time-varying external light according to the first embodiment;

FIG. 13 is a block diagram showing a third embodiment.

FIG. 14 is a diagram illustrating the operation of a conventional example when there is external light that does not change over time.

FIG. 15 is an operation explanatory diagram in the case where there is time-varying external light as in the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lamp 2 Lighting circuit part 3A, 3B Brightness sensor 4 Control part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K073 AA13 AA14 AA53 BA26 BA27 BA28 CA05 CE12 CE17 CF01 CF13 CG42 CH03 CH42 CJ22 CM07

Claims (10)

[Claims] 1. A lamp for irradiating light to a surface to be illuminated, a lighting circuit for lighting the lamp, and a light receiving surface having different spectral sensitivity characteristics and receiving light reflected from the surface to be illuminated to thereby increase the brightness of the surface to be illuminated A plurality of brightness sensors for detecting the brightness of the lamp, and a control unit for varying the light output of the lamp by controlling the lighting circuit unit with a dimming signal corresponding to the light output level of the lamp. The lighting circuit is controlled by outputting a dimming signal so that the output has a plurality of different levels, and the light output is obtained from the difference between the detection output of each brightness sensor and the level difference of the light output for each light output level. Determine the correspondence of the brightness of the irradiated surface to the level, set the target value of the brightness of the irradiated surface from the obtained correspondence, and send a dimming signal to the lighting circuit section to make it approximately match the set target value. Output, characterized by Lighting device. 2. The brightness sensor according to claim 1, wherein the plurality of brightness sensors have spectral sensitivity characteristics having substantially the same sensitivity to at least a wavelength range of light emitted by the lamp, and the control unit controls each brightness sensor for each light output level. If the difference between the detected outputs is approximately the same, the correspondence between the light output level and the brightness of the irradiated surface is determined.If the difference between the detected outputs is different, it is determined that the light emitted from the light source other than the lamp has changed. The lighting device according to claim 1, wherein: 3. A brightness sensor comprising: a first brightness sensor having sensitivity in a wavelength range of light emitted from a lamp; and a brightness sensor having no sensitivity in a wavelength range of light emitted from the lamp and other than the lamp. A second brightness sensor having sensitivity in a wavelength range of the light emitted by the light source, wherein the control unit determines whether the light output level of the second brightness sensor is substantially equal to the light output level of the second brightness sensor. A correspondence relationship between the output level and the brightness of the illuminated surface is obtained, and when the difference between the detection outputs of the second brightness sensor is different, it is determined that the light emitted from a light source other than the lamp has changed. The lighting device according to claim 1. 4. The illuminating device according to claim 2, further comprising a notifying unit for notifying, when the control unit determines that the light emitted from a light source other than the lamp has changed, that fact. 5. The control unit according to claim 1, wherein when the control unit determines that the light emitted from the light source other than the lamp has changed, the control unit again performs a process of obtaining a correspondence relationship between the light output level and the brightness of the irradiated surface. Item 4. The lighting device according to item 2 or 3. 6. When the control unit determines that the light emitted from a light source other than the lamp has changed, the control unit notifies the fact and calculates again the correspondence between the light output level and the brightness of the irradiated surface. The lighting device according to claim 2, wherein the lighting is performed. 7. The lighting device according to claim 1, wherein the lamp is a fluorescent lamp. 8. The lighting device according to claim 1, wherein the light source other than the lamp includes the sun. 9. The control unit according to claim 1, wherein in the processing for obtaining the correspondence between the light output level and the brightness of the irradiated surface, the control unit outputs the dimming signal so that one of the plurality of different light output levels is set to the rated level of the lamp. The lighting device according to claim 1, wherein the lighting device outputs the light. 10. The control unit according to claim 1, wherein in the processing for obtaining the correspondence between the light output level and the brightness of the illuminated surface, one of a plurality of mutually different light output levels is represented by a ratio to a rated level of the lamp. 10. A dimming signal is output so as to have a level of 25%.
The lighting device according to any one of the above.