JPH097774A - Variable color temperature light source device - Google Patents

Abstract

PURPOSE: To obtain a variable color temperature light source device which can realize the lights of different color rendering properties by the same light color. CONSTITUTION: The variable color temperature light source device is composed of a low color temperature light source 1 belonging to a low color temperature area, and a high color temperature light source 2 belonging to a high color temperature area, and to the light source of the low color temperature light source, a three-wavelength area emission type fluorescent lamp 11a and a continuous spectrum high color rendering type fluorescent lamp 11b are used as at least two sorts of light source with different spectrum. To the light source of the high color temperature light source, a three-wavelength area emission type fluorescent lamp 21a and a continuous spectrum high color rendering type fluorescent lamp 21b are used as at least two sorts of light source with different spectrum, and those lamps are flashed or dimming controlled by a dimming control device 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable color temperature light source device which realizes light having a desired correlated color temperature by blinking or dimming a plurality of light sources which emit light of different color temperatures.

[0002]

2. Description of the Related Art FIG. 6 shows, for example, JP-A-6-260295.
It is a figure which shows the conventional color temperature variable light source device shown by the publication, 11 is a 1st fluorescent lamp which shows a warm-colored light color, 21 is a 2nd fluorescence which shows a cold-colored light color. A lamp, 12 is a first lighting device that lights the first fluorescent lamp, 22 is a second lighting device that lights the second fluorescent lamp, and 3 is a dimming control device including a remote control receiver.

The conventional color temperature variable light source device is constructed as described above, and the first lighting device 12 is the first fluorescent lamp 11.
Lighting control is performed, and the second lighting device 22 controls lighting of the second fluorescent lamp 21. In the conventional color temperature variable light source device,
The chromaticity point of the light obtained by mixing the first fluorescent lamp 11 and the second fluorescent lamp 21 is the first by the principle of additive color mixing.
Is located on the line segment connecting the chromaticity point of the fluorescent lamp 11 and the chromaticity point of the second fluorescent lamp 21. When it is desired to illuminate with a light color intermediate between the light colors of the first fluorescent lamp and the second fluorescent lamp, the light quantity ratio of these fluorescent lamps can be mixed by adjusting the light quantity ratio to a predetermined value by means such as dimming. realizable.

[0004]

In the color temperature variable light source device as described above, when the first fluorescent lamp and the second fluorescent lamp are specified, the realizable light color, color rendering performance, and luminous flux range are automatically determined. However, there is a problem that the light color, the color rendering performance, and the luminous flux located outside this range cannot be realized.

The present invention has been made to solve the above problems, and belongs to at least one of the light sources belonging to the respective color temperature regions of low color temperature and high color temperature. The light source is composed of at least two types of light sources having different spectra, and by controlling the blinking or dimming of these two types of light sources, it is possible to realize light of the same light color and different color rendering performance. The purpose is to obtain the device.

[0006]

A color temperature variable light source device according to the present invention is a color temperature variable light source device which realizes light of a desired correlated color temperature by controlling blinking or dimming of light sources having different color temperatures. A low color temperature light source unit belonging to the low color temperature region, and a high color temperature light source unit belonging to the high color temperature region,
It is characterized in that the light source of at least one of the light source units is composed of at least two types of light sources having different spectra. That is, for at least one of the high color temperature region and the low color temperature region, there is provided means for blinking or dimming control of a plurality of light sources belonging to this color temperature region and having different spectra.

In the above color temperature variable light source device, the two kinds of light sources having different spectra are a high efficiency lamp and a high color rendering lamp, and more preferably, a three-wavelength light emitting type fluorescent lamp is used as the high efficiency lamp. A continuous spectrum high color rendering fluorescent lamp is used as the lamp.

Further, the present invention has a low color temperature light source part belonging to the low color temperature region and a high color temperature light source part belonging to the high color temperature region. Of these light source parts, the low color temperature light source part is included. A color temperature conversion filter that lowers the correlated color temperature of the light source is used for the light source of, and a color temperature conversion filter that increases the correlated color temperature of the light source is used for the light source of the high color temperature light source unit. This is a temperature variable light source device.

[0009]

In the color temperature variable light source device of the present invention constructed as described above, light having different spectra is mixed in one color temperature region, and the light due to the mixed light is spectrum-mixed according to the mixing ratio. The characteristics are different, and the color of the object illuminated by this light is also rendered into a different color due to the spectral characteristics. In this case, when two kinds of light sources having different spectra are a high-efficiency lamp and a high color-rendering lamp to realize a desired light color with an emphasis on efficiency,
In addition, it is possible to cope with both cases where a desired light color is realized with emphasis on color rendering performance.

Further, by mounting a color temperature conversion filter for lowering the correlated color temperature of the light source on the light source in the low color temperature region, the spectrum on the short wavelength side is cut off, and the correlated color temperature of the light source is on the low color temperature side. Shift to. By attaching a color temperature conversion filter that increases the correlated color temperature of the light source to the light source in the high color temperature region, the spectrum on the long wavelength side is blocked, and the correlated color temperature of the light source shifts to the high color temperature side.

[0011]

【Example】

Embodiment 1 FIG. 1 is a conceptual diagram showing a configuration of a color temperature variable light source device according to a first embodiment of the present invention. In the figure, 1 belongs to a low color temperature region, a low color temperature light source unit, and 2 belongs to a high color temperature region. The high color temperature light source parts 11a and 11b are the three wavelength band light emitting type fluorescent lamps and the continuous spectrum high color rendering light bulb color fluorescent lamps 21a and 21 constituting the low color temperature light source part 1.
b is a three-wavelength band emission type daylight fluorescent lamp which constitutes the high color temperature light source unit 2 and a continuous spectrum high color rendering type daylight fluorescent lamp, and 12a, 12b, 22a and 22b are dimming fluorescent lamps 11a, 11b, 21a and 21b, respectively. The lighting device 3 to be operated is the lighting device 12a, 12b, 22a, 22.
It is a dimming control device that determines a dimming level for each b and generates a dimming signal.

FIG. 2 is a conceptual diagram showing a cross-sectional structure of the color temperature variable light source device of FIG. 1. Reference numeral 4 is a mixture of light from the low color temperature light source unit 1 and light from the high color temperature light source unit 2. The diffuser plate reduces the color unevenness on the light emitting surface of the lighting device due to the mixed light and diverges the illumination light having a desired correlated color temperature to the outside of the lighting device. Reference numeral 5 is a main body of the lighting equipment.

FIG. 3A shows a typical spectral energy distribution of the three-wavelength band emission type fluorescent lamp, and FIG. 3B shows a typical spectral energy distribution of the continuous spectrum high color rendering fluorescent lamp. The three-wavelength band emission type fluorescent lamp mentioned here is represented by a fluorescent lamp model name EX, and the continuous spectrum high color rendering type fluorescent lamp is a lamp represented by a fluorescent lamp model name SDL or EDL. As is clear from these figures, the three-wavelength band emission type fluorescent lamp is composed of light of the colors corresponding to the three primary colors of red, green and blue, and the continuous spectrum high color rendering fluorescent lamp is 380 to 780. It has a continuous spectrum over the visible range of [nm].

Next, the operation will be described. Depending on the application and situation in which this color temperature variable light source device is used, desired correlated color temperature, color rendering performance, luminous flux, etc. are determined for the low color temperature light source section 1 and the high color temperature light source section 2, respectively, and adjusted. Light control device 3
Is input to The dimming control device 3 determines the dimming level of the fluorescent lamps 11a, 11b, 21a, 21b based on this information.

Regarding the light source colors of the three-wavelength band emission type fluorescent lamp and the continuous spectrum high color rendering type fluorescent lamp, if the chromaticity is the same, the perceived light color is the same. However, it is necessary to consider the spectral energy distribution of the light source for the object color that is the color of the illuminated object. As shown in FIG. 3A, the three-wavelength band emission type fluorescent lamp emits light in a narrow band of red, green and blue. On the other hand, an illuminated object generally has a continuous spectral reflectance distribution. Therefore, when illuminated by a three-wavelength band emission type fluorescent lamp, light is reflected only in the wavelength range inside the narrow band, and light is not reflected in other bands. That is, the color of the object illuminated by the three-wavelength band fluorescent lamp is rendered different from the color of the object illuminated by the continuous spectrum light source. Therefore, for example, it is insufficient as a color rendering of skin color by cosmetics, lighting for painting production, and painting appreciation.
In this case, since the yellow and blue-green light is not reflected, the color of the object looks more vivid. On the other hand, a continuous spectrum high color rendering fluorescent lamp reflects light corresponding to the spectral reflectance distribution of an object illuminated over the entire visible range, so that the color of the object looks more natural, and the skin color rendering and painting production are possible.・
It is more suitable as a light source for appreciation.

However, the efficiency of the three-wavelength emission type fluorescent lamp is 89 [lm / w], and the efficiency of the continuous spectrum high color rendering type fluorescent lamp is 55 [lm / w], which are greatly different in terms of efficiency. There is. Generally, a high-efficiency light source is superior in efficiency to a high color rendering light source, but is inferior in color rendering performance to a high color rendering light source. When lighting is required to efficiently realize light colors such as the atmosphere of lighting,
Alternatively, there are cases where the light color and the color rendering performance are emphasized as in the case of seeing the color of the skin to which makeup is applied, and the light color and the color rendering performance according to the purpose are required. When color rendering performance is most important, such as in makeup, painting, and meals, the continuous spectrum high color rendering bulb color fluorescent lamp 11b and the continuous spectrum high color rendering daylight fluorescent lamp 21b are blinked or dimmed by the dimming control device 3. Light control is performed, and if the ratio of the luminous flux of the fluorescent lamp 11b is large, the light color is shifted to the low color temperature side, and if the ratio of the luminous flux of the fluorescent lamp 21b is large, the light color is shifted to the high color temperature side, and desired light having high color rendering performance is obtained. Colored light can be generated. In situations such as parties and reading where brightness and light color are important, and color rendering performance is also important to some extent, three-wavelength range light emitting type fluorescent lamp 11a, continuous spectrum high color rendering light bulb color fluorescent lamp 11b, three wavelength emitting daylight color Flashing or dimming control of the fluorescent lamp 21a and the continuous spectrum high color rendering daylight fluorescent lamp 21b by the dimming control device 3 makes it possible to generate light with high illuminance and with a certain emphasis on color rendering performance. In a daytime scene production or a scene where importance is placed on brightness and efficiency such as office work, the three-wavelength band emission type light bulb color fluorescent lamp 11a and the three-wavelength range light emitting type daylight color fluorescent lamp 21a are blinked or adjusted by the dimming control device 3. By performing light control, light with high illuminance can be realized with high efficiency.

Example 2. FIG. 4 is a conceptual diagram showing the configuration of the second embodiment of the present invention. In the first embodiment, the case where each fluorescent lamp is provided one by one is described, but these may be plural, and the lighting devices 12a, 12b, 22a, 2 are provided.
In order to effectively use 2b, a switch 6 is provided between the lamp and the lighting device as shown in FIG. 4, and for example, when the three-wavelength band emission type fluorescent lamps 11a and 21a are turned on, a continuous spectrum high color rendering type is used. The lighting devices 12b and 22b that have turned on the fluorescent lamps 11b and 21b may be switched to turn on the three-wavelength band emission type fluorescent lamps 11a and 21a. That is, in the present embodiment, the three-wavelength band emission type fluorescent lamp 11 constituting the low color temperature light source unit 1 and the high color temperature light source unit 2 is used.
Since each of a and 21a is provided with two lighting devices 12b and 22b of the continuous spectrum high color rendering fluorescent lamp using the switch 6, high illuminance can be realized without increasing the number of lighting devices.

Example 3. FIG. 5 is a conceptual diagram showing the configuration of the third embodiment of the present invention. In the present embodiment, the light source of the low color temperature light source unit 1 uses a three-wavelength band emission type light bulb color fluorescent lamp 11a, and the light source of the high color temperature light source unit 2 uses a three-wavelength band emission type daylight color fluorescent lamp 21a. A color temperature conversion filter 13a that lowers the color temperature of the light emitted from the color temperature conversion filter 13a is installed in the low color temperature region, and a color temperature conversion filter 23a that increases the color temperature of the high color temperature region is installed.

As one of the purposes of the variable color temperature light source, there is a demand to realize light in a wide range of correlated color temperature such as from sunset to blue sky light. Since it is not possible to meet the requirement of, the color temperature conversion filter is installed. Mitsubishi Electric Osram's three-wavelength emission type light bulb color fluorescent lamp and daylight fluorescent lamp have correlated color temperatures of 3000, respectively.
[K] and 6700 [K], and the color temperature conversion filter 1
By installing 3a and 23a, respectively, 28
It was possible to convert to correlated color temperatures of 00 [K] and 7200 [K].

In the third embodiment, the fluorescent lamp is a three-wavelength band emission type fluorescent lamp, but a continuous spectrum high color rendering fluorescent lamp having a continuous spectrum may be used. In each of the above examples,
There may be a plurality of light sources in the low color temperature region and the high color temperature region, respectively, and the three-wavelength region emission type fluorescent lamp and the continuous spectrum high color rendering type fluorescent lamp may be mixed. Further, although the fluorescent lamp has been described, any other light source capable of blinking or dimming control can be used.

[0021]

Since the color temperature variable light source device of the present invention is constructed as described above, it has the effects described below.

It is composed of light source units belonging to two kinds of color temperature regions, that is, a low color temperature region and a high color temperature region, and at least one of the light sources belonging to each of these color temperature regions is different. Since it is composed of at least two kinds of light sources having a spectrum, it is possible to realize light with the same light color and different color rendering performance.

Since two types of light sources having different spectra are a high-efficiency lamp and a high color-rendering lamp, when a desired light color is realized with an emphasis on efficiency and when a desired light color is realized with emphasis on a color rendering performance. Both can be accommodated.

At least one of a color temperature conversion filter for lowering the correlated color temperature of the light source is provided for the light source in the low color temperature region, and a color temperature conversion filter for increasing the correlated color temperature of the light source is provided for the light source in the high color temperature region. Since it is installed in the light source in the color temperature region, it is possible to inexpensively realize the correlated color temperature in a wider range than the correlated color temperature range that can be realized by those lamps themselves.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a configuration of a lighting fixture according to a first embodiment of the present invention.

FIG. 3 is a diagram showing an example of spectral energy distribution of a three-wavelength band emission type fluorescent lamp and a continuous spectrum high color rendering type fluorescent lamp.

FIG. 4 is a conceptual diagram showing a configuration of a second embodiment of the present invention.

FIG. 5 is a conceptual diagram showing a configuration of a third exemplary embodiment of the present invention.

FIG. 6 is a conceptual diagram showing a conventional color temperature variable light source device.

[Explanation of symbols]

1 low color temperature light source section, 2 high color temperature light source section, 3 dimming control device, 11a three-wavelength band emission type light bulb color fluorescent lamp, 1
1b Continuous spectrum high color rendering type incandescent fluorescent lamp, 12
a, 12b, 22a, 22b lighting device, 21a three-wavelength band emission type daylight fluorescent lamp, 21b continuous spectrum high color rendering daylight fluorescent lamp, 13a color temperature conversion filter for decreasing color temperature, 23a color temperature conversion for increasing color temperature filter.

Claims (4)

[Claims] 1. A color temperature variable light source device which realizes light of a desired correlated color temperature by controlling blinking or dimming of light sources having different color temperatures, and a low color temperature light source part belonging to a low color temperature region, A variable color temperature light source device, comprising: a high color temperature light source unit belonging to a color temperature region, wherein at least one of the light source units is composed of at least two types of light sources having different spectra. 2. The variable color temperature light source device according to claim 1, wherein the two types of light sources having different spectra are a high efficiency lamp and a high color rendering lamp. 3. The variable color temperature light source device according to claim 2, wherein the high-efficiency lamp is a three-wavelength band emission type fluorescent lamp, and the high color rendering lamp is a continuous spectrum high color rendering type fluorescent lamp. 4. A color temperature variable light source device which realizes light of a desired correlated color temperature by controlling blinking or dimming of light sources having different color temperatures, and a low color temperature light source section belonging to a low color temperature region and a high color temperature light source section. A color temperature conversion filter for reducing the correlated color temperature of the light source in the light source of the low color temperature light source unit, which has a high color temperature light source unit belonging to the color temperature region; A color temperature variable light source device characterized in that a color temperature conversion filter for increasing a correlated color temperature of a light source is installed in at least one of the light sources in a light source of the light source section.