JPH11185974A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system capable of making a sufficient illuminance correction without resetting the light beam attenuation data of an illumination load due to the stain of a luminaire even when the stain of the luminaire is removed, i.e., when the luminaire is cleaned. SOLUTION: This lighting system is constituted of a lamp 5, a memory section 1 storing the correction data in response to the light beam attenuation due to external causes such as the stain of a luminaire or the stain of an illuminance sensor 3, the illuminance sensor 3 detecting the reflected light on the upper face of a desk and outputting a voltage proportional to the reflected light quantity, a control part 2 changing the dimming signal in response to the correction data stored in the memory section 1 and the detected value of the illuminance sensor 3 and a dimming stabilizer 4 receiving the dimming signal from the control part 2 and controlling the light output of the lamp 5. The light output of the lamp 5 is feedback-controlled so that the detected output of the illuminance sensor 3 becomes a prescribed set value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device, and more particularly, to a lighting device that performs daylight-linked and initial illuminance correction by feedback-controlling the light output of an illumination load so as to maintain a set illuminance. Related to the device.

[0002]

2. Description of the Related Art A first conventional example according to the present invention is disclosed in Japanese Patent Application Laid-Open No. 64-89287. In this conventional example, the luminous flux reduction characteristics due to aging and the characteristics due to dirt on the lighting fixtures are stored in advance for each lighting fixture, and an appropriate illuminance is secured based on an illuminance correction value corresponding to the characteristics.

A second prior art according to the present invention is disclosed in
There is one disclosed in JP-A-143189. In this conventional example, a predetermined light output can be obtained by calculating a detection value of the temporal decrease of the luminous flux of the illumination load and a correction value of the temporal contamination of the luminaire stored in advance.

[0004]

However, in the first and second conventional examples, when the dirt of the lighting equipment is removed, that is, when the lighting equipment is cleaned, the illumination correction value, the time-dependent dirt correction value, etc. However, it is necessary to reset the data for performing the light output reduction correction due to the dirt on the lighting fixture, and even if the data is reset (= initialized), the dirt on the lighting fixture does not necessarily return to the initial state. Not limited,
There is a problem that sufficient illuminance correction cannot be performed.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for lighting a lighting device by cleaning the lighting device even if the lighting device is cleaned. An object of the present invention is to provide an illumination device capable of performing sufficient illuminance correction without resetting light flux attenuation data of a load.

[0006]

According to the first aspect of the present invention, there is provided an illuminance sensor for detecting illuminance on a desk surface, and correction data corresponding to luminous flux attenuation of an illumination load due to an external factor. And a control unit that performs feedback control in a direction in which the desk surface illuminance becomes substantially constant according to the correction data and the detection value of the illuminance sensor.

According to the second aspect of the invention, the external factor is at least one of deterioration of the lighting load, dirt of the lighting fixture, dirt of the lighting load, dirt of the illuminance sensor, and dirt degree of the installation place of the lighting fixture. It is characterized by including.

According to a third aspect of the present invention, a switching means is provided for selecting a degree of contamination at a place where the lighting equipment is installed.

[0009]

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

In this configuration, a lighting load (hereinafter referred to as a lamp) 5 and correction data corresponding to luminous flux attenuation due to external factors such as lamp deterioration, lamp dirt, dirt on lighting equipment, dirt on the illuminance sensor 3 and the like are stored. A storage unit 1 for storing, an illuminance sensor 3 for detecting reflected light on the desk surface and outputting a voltage proportional to the amount of reflected light, and dimming according to correction data stored in the storage unit 1 and a detection value of the illuminance sensor 3 Controller 2 for changing signal
And a dimming stabilizer 4 that receives a dimming signal from the control unit 2 and controls the light output of the lamp 5. Then, control is performed to feed back the light output of the lamp 5 so that the detection output of the illuminance sensor 3 becomes the set value X.

Here, the set value X in the illuminance sensor 3 is represented by the following equation. Set value X = Illuminance sensor output A at 100% light output A × Lamp deterioration ratio α × Lamp contamination ratio β × Lighting appliance contamination ratio γ × Illuminance sensor contamination ratio ε (where α, β, γ,
It is sufficient that at least one of ε is included. Then, by controlling with the set value X as described above, the light output of the lamp rises with the passage of time as shown by the solid line in FIG. 2, and the illuminance on the desk surface becomes longer as shown by the broken line in FIG. It becomes almost constant regardless of progress.

With the above-described configuration, the illuminance on the desk surface can be made substantially constant regardless of external factors at least until the end of the lamp life, and the illuminance sensor detects the light output of the luminaire. Therefore, the desk surface illuminance can be made substantially constant without performing a reset or the like even when cleaning the appliance.

It is assumed that the amount of light reflected on the desk surface incident on the illuminance sensor 3 and the illuminance on the desk surface are substantially proportional. FIG. 3 shows the luminous flux deterioration characteristics which occur over time due to external factors such as lamp deterioration, lamp dirt, lighting fixture dirt, and illuminance sensor dirt. 3A shows the case of lamp deterioration, FIG. 3B shows the case of lamp dirt, FIG. 3C shows the case of lighting fixture dirt, and FIG. 3D shows the case of illuminance sensor dirt. Further, here, the point in time when the luminous flux deterioration is reduced by about 30% from the initial value is determined as the lamp life (here, about 1200
(When 0 hour has passed).

(Embodiment 2) FIG. 4 shows a block diagram of a second embodiment according to the present invention.

The difference from the first embodiment shown in FIG. 1 resides in that a dirt degree switching means 6 is provided, and the same components as those in the other first embodiments are denoted by the same reference numerals. Is omitted. The storage unit 1 stores the lamp deterioration,
It is assumed that correction data corresponding to luminous flux attenuation due to external factors such as lamp dirt, lighting fixture dirt, illuminance sensor dirt, and dirt degree at the place where the lighting fixture is installed are stored.

Here, the set value X of the illuminance sensor 3 is represented by the following equation. Set value X = Illuminance sensor output A at 100% light output A × Lamp deterioration ratio α × Lamp dirt ratio β × Lighting fixture dirt ratio γ × Illuminance sensor dirt ratio ε × Dirt degree P depending on lighting fixture installation location (However, it is sufficient that at least one of α, β, γ, and ε is included.) By controlling with the set value X as described above, the light output of the lamp becomes a solid line in FIG. As shown in FIG. 5, the illuminance of the desk surface rises with the passage of time, and the illuminance of the desk surface becomes substantially constant irrespective of the passage of time as shown by the broken line in FIG.

With this configuration, it is possible to obtain a substantially constant desk surface illuminance irrespective of the degree of contamination of the place where the lighting equipment is installed. In addition, as shown in FIG. 5, it is desirable to set so that the degree of increase in the light output of the lamp increases as the degree of contamination at the place where the lighting equipment is installed is lower.

[0018]

According to the first to third aspects of the present invention,
At least until the end of the lamp life, the desk surface illuminance can be made substantially constant regardless of external factors, and the illuminance sensor detects the light output of the lighting equipment. Illuminating device that can make the desk surface illuminance substantially constant without performing the above.

[Brief description of the drawings]

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

FIG. 2 shows a characteristic diagram of light output and desk surface illuminance according to the embodiment.

FIG. 3 is a diagram showing a luminous flux attenuation characteristic due to an external factor.

FIG. 4 shows a block diagram of a second embodiment according to the present invention.

FIG. 5 is a characteristic diagram of light output and desk surface illuminance according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage part 2 Control part 3 Illumination sensor 5 Lighting load 6 Switching means

Claims (3)

[Claims] An illuminance sensor for detecting illuminance of a desk surface; a storage unit for storing correction data corresponding to a luminous flux attenuation of an illumination load due to an external factor; and a desk surface according to the correction data and a detection value of the illuminance sensor. A control unit that performs feedback control in a direction in which the illuminance becomes substantially constant. 2. The external factor includes at least one of deterioration of a lighting load, dirt of a lighting fixture, dirt of a lighting load, dirt of the illuminance sensor, and dirt of a place where the lighting fixture is installed. The lighting device according to claim 1, wherein: 3. The lighting device according to claim 2, further comprising a switching unit for selecting a degree of contamination at a place where the lighting fixture is installed.