JPH04296491A - Color temperature variable lighting device - Google Patents

Abstract

PURPOSE:To prevent the brightness by visual sense from being changed at the time of changing the color temperature in a lighting device in which the color temperature is variable. CONSTITUTION:An equipment body 1 has light sources 2R, 2G, 2B having red, green and blue luminescent colors, respectively. The dimming amount of each light source 2R, 2G, 2B is independently controlled by dimmers 4R, 4G, 4B, whereby the color temperature as the whole is regulated. The dimming amount of each dimmer 4R, 4G, 4B is determined according to the dimming data to each dimmer 4R, 4G, 4B set every color temperature in a dimming data memory part 6. The dimming data is set so that the whole luminescent light quantity is reduced in accordance with the lowering of the color temperature.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable temperature lighting device that can adjust the color temperature of mainly white illumination light.

0002

2. Description of the Related Art In recent years, in order to improve the living environment, it has been required to be able to adjust the color temperature of illumination light depending on the time, place, and purpose. In order to meet such requirements, a lighting device is configured that includes a plurality of light sources with different light colors, and the amount of light emitted by each light source is controlled by a control unit so as to change the ratio of the amount of light emitted from each light source. is considered. That is, by changing the ratio of the amount of light emitted from each light source, the color temperature of the illumination light obtained by the lighting equipment is changed.

0003

By the way, it is known that when the color temperature is adjusted while keeping the physical illuminance constant, the visual sensation gives the impression that the brightness has changed. Generally, the lower the color temperature, the brighter it feels. As a result, when adjusting the color temperature, there is a problem in that an unnatural feeling as if the brightness has changed occurs.

[0004] The present invention aims to solve the above-mentioned problems, and aims to provide a color temperature variable illumination device that does not give an unnatural feeling as if the brightness has changed even when the color temperature is changed.

[0005]

[Means for Solving the Problems] In claim 1, in order to achieve the above-mentioned object, the lighting equipment includes a lighting device including a plurality of light sources of different light colors, and a control unit that controls the amount of light emitted from each light source. In a color temperature variable lighting device that adjusts the color temperature of the illumination light obtained by the lighting equipment by changing the ratio of the amount of light emitted from each light source, the control unit adjusts the total amount of light emitted as the color temperature decreases. This reduces the

[0006] In claim 2, the control section has a color temperature of 400.
In the region lower than the specified temperature of 0 to 7000°K, 20
The total amount of emitted light is reduced within 20% per 00°K.

[0007]

[Operation] According to the structure of claim 1, since the total amount of emitted light is reduced as the color temperature decreases, even if the color temperature is adjusted, changes in brightness in the visual sense are reduced. This reduces the discomfort that occurs when adjusting the color temperature. The configuration of claim 2 is a preferred embodiment.

[0008]

[Example 1] In this example, as shown in FIG. 1(a), a first light source 2R of red color, a second light source 2G of green color, and a third light source of blue color are used. A lighting fixture is constructed by providing the light source 2B in one fixture body 1. In this embodiment, it is assumed that the emitted light color and maximum emitted light amount of each of the light sources 2R, 2G, and 2B are set as follows. If the emitted color is expressed by chromaticity coordinates, the maximum amount of emitted light is expressed by total luminous flux, and is expressed by a triplet of (x coordinate, y coordinate, total luminous flux (unit: lumens)), then the first light source is red. 2R is (0.377, 0.334, 2550), the second green color
The light source 2G is (0.331, 0.536, 3670),
The blue third light source 2B is (0.157, 0.082,
1100). Here, light sources 2R, 2G, 2
B can be of any type as long as it can emit light of different colors, such as a fluorescent lamp, a colored light bulb, an HID lamp, or a combination of a lamp and a color filter.

Each of the light sources 2R, 2G, and 2B is dimmed by a control section 3. The control unit 3 includes dimmers 4R, 4G, 4B provided for each light source 2R, 2G, 2B and inserted between each light source 2R, 2G, 2B and a power source AC, and each dimmer 4R,
A dimming signal generation unit 5 outputs a dimming signal for setting the dimming amount by 4G and 4B, and the color temperature of the illumination light obtained by the lighting equipment and the dimming amount of each light source 2R, 2G, and 2B. a dimming data storage unit 6 storing matched dimming data;
It consists of an operation section 7 that sets the amount of dimming of each of the light sources 2R, 2G, and 2B by specifying the dimming data stored in the dimming data storage section 6. The dimming data storage unit 6 is a ROM
For each address (cell), each light source 2R, 2
The dimming data for G and 2B are stored as a triplet. That is, an address corresponds to a color temperature, and by specifying an address corresponding to a desired color temperature, dimming data corresponding to that color temperature is output. Therefore, the operation section 7 may be configured to be able to specify the address of the dimming data storage section 6, and is configured by an up/down counter, a switch, and the like.

Incidentally, the light control data is set to have a relationship as shown in FIG. 1(b). In other words, the setting is such that the lower the color temperature, the lower the total amount of emitted light (expressed here as relative illuminance). If the color rendering index is the same, the relative illuminance will decrease by 1 for every 2000°K decrease in color temperature.
Set to decrease by 0%. In this way, even if the color temperature changes, the brightness will not change visually. In other words, if we focus on 5000°K,
The relationship between color temperature Tc and relative illuminance E is E=1+α(Tc
-5000). however,
0.00075≦α≦0.0001. In this embodiment, the light sources 2R, 2G, and 2B have the above characteristics, so if the color temperature is set to 3000°K, the dimming amount of each light source 2R, 2G, and 2B is set to (65 %, 7
0%, 2%), and if the color temperature is 5000°K, then (
45%, 90%, 35%) and the color temperature is 6500°K.
If so, set it as (40%, 100%, 50%).

[0011] In this embodiment, the dimmers 4R, 4G,
4B and the dimming signal generating section 5 are separated, but they may be integrated. Further, as the dimming signal, a well-known signal such as a phase signal, a duty signal, or an analog signal may be used. Furthermore, the dimming data storage unit 6 stores all the light sources 2R, 2G,
Although only one light source is provided for 2B, a separate light source may be provided for each light source. The operation unit 7 includes a switch that changes the output of an up/down counter, as well as a switch that changes the output of an up/down counter.
It may be operated in an analog manner using a fader.

(Example 2) In this example, as shown in FIG. 2, in a region where the color temperature is lower than a predetermined temperature in the range of 4000 to 7000°K, the color temperature is set to 2000°K.
The setting is such that the illuminance decreases within 20% each time the temperature decreases by °K. The changing point of the region where the illuminance is reduced may be set at any temperature between 4000 and 7000°K. In addition, the illuminance changes with respect to the color temperature in the region lower than the change point (4000°K) are linear with a relatively large rate of change as shown in A in Figure 2, and linear with a relatively large rate of change as shown in B in Figure 2. A curved one, C in Figure 2
It can be arbitrarily selected, such as a linear one with a relatively small rate of change. For regions where the color temperature is higher than the change point, settings can be made as shown in E and D in FIG. 2 (illuminance does not change with respect to color temperature). The change point is 7
000°K, changes such as F and G in FIG. 2 may be adopted.

(Embodiment 3) In this embodiment, as shown in FIG. 3, a light source 2a, which is a fluorescent lamp, and a light source 2b, which is an incandescent lamp, are provided in the appliance body 1. is constituted by a changeover switch SW that selectively turns on one of the light sources 2a and 2b. Further, a lighting circuit 8 is inserted between the light source 2a and the changeover switch SW.

For example, the light source 2a is two round fluorescent lamps of 30W and 32W (color temperature 5000°K),
Light source 2b is four 80W incandescent bulbs (color temperature 2800°)
K), the total luminous flux of each light source 2a, 2b will be 4,600 lumens and 4,000 lumens, respectively. Therefore, the color temperature ranges from 5000°K to 2800°K.
, the luminous flux changes from 4,600 lumens to 4,000 lumens, and the illuminance decreases by 13%. That is, the same changes as in Example 1 were obtained,
This allows you to switch the color temperature without any discomfort.

(Embodiment 4) In this embodiment, as in Embodiment 3, a light source 2a made of a fluorescent lamp and a light source 2b made of an incandescent bulb are provided in the appliance body 1, and as shown in FIG. As shown, between both light sources 2a, 2b and the power supply AC,
Dimmers 4a and 4b are inserted as control units 3, respectively. The amount of dimming of the dimmers 4a and 4b is set by operating the knob 7a of the operating section 7. Here, both dimmers 4a and 4b are controlled so that the amount of dimming is contradictory to each other by operating the operation unit 7, and when one is lit at 100%, the other is lit at 0%, The sum of the amounts of light is set to always be 100%.

It is assumed that four 20W fluorescent lamps (color temperature 5000°K) are used as the light source 2a, and four 80W incandescent lamps (color temperature 2800°K) are used as the light source 2b, each with a maximum luminous flux. are 4,700 lumens and 4,000 lumens, and if the light source 2a is changed from 100% lighting to 0% lighting (lights out) by controlling the amount of dimming of each dimmer 4a and 4b, , the color temperature is 5000
It gradually decreases from °K to 2800 °K, and as the color temperature decreases, the luminous flux is continuously reduced from 4700 lumens to 4000 lumens. In other words, the same changes as in Example 1 can be continuously obtained.

(Embodiment 5) In this embodiment, as shown in FIG. 5, a plurality of lighting fixtures 10 whose color temperature can be adjusted are arranged in a room such as an office. As each lighting fixture 10, those shown in each of the above embodiments can be used. Further, the room is divided into a plurality of sections A to E, and the color temperature of the lighting fixture 10 can be set for each section A to E. The control unit 3 for setting the color temperature of the lighting fixture 10 is provided in one unit for all sections A to E. Furthermore, a sensor 9 that detects the amount of outside light and room temperature is arranged in each section A to E, and the output of the sensor 9 is inputted to the control unit 3 and used to control the amount of dimming of the lighting fixture 10. It has become. That is, the color temperature for each section A to E is individually set by operating the operation section (not shown) of the control section 3, but the color temperature for each section A to E detected by the sensor 9 is set individually. The color temperature is adjusted around the set value, taking into account the amount of outside light and room temperature. Here, if the color temperature changes, the illuminance also changes, so even if the color temperatures of the sections A to E are different from each other, it is possible to prevent the visual brightness from changing. That is, even when people move to different sections A to E, they do not feel uncomfortable due to changes in brightness.

[0018] Since elderly people do not perceive much glare even when the color temperature is low, it is desirable to set the color temperature low in sections A to E where elderly people are mainly working.

[0019]

[Effects of the Invention] As described above, the present invention reduces the total amount of emitted light as the color temperature decreases, so even if the color temperature is adjusted, changes in visual brightness are reduced. This has the advantage that the discomfort that occurs when adjusting the color temperature is reduced.

[Brief explanation of drawings]

FIG. 1 shows Example 1, (a) is a block diagram, (b)
is an operation explanatory diagram.

FIG. 2 is an explanatory diagram of the operation of the second embodiment.

FIG. 3 is a block diagram of a third embodiment.

FIG. 4 is a block diagram of a fourth embodiment.

FIG. 5 is a schematic configuration diagram of Example 5.

[Explanation of symbols]

1. Equipment body 2R Red light source 2G green light source 2B Blue light source 3 Control section 4R Red dimmer 4G green dimmer 4B Blue dimmer 5 Dimming signal generation section 6 Dimming data storage section 7　　　　Operation section

Claims (2)

[Claims] Claim 1: A lighting equipment comprising a plurality of light sources with different light colors, and a control unit that controls the amount of light emitted from each light source, and the lighting equipment has a control unit that controls the amount of light emitted from each light source. 1. A variable color temperature lighting device that adjusts the color temperature of illumination light, wherein the control unit reduces the total amount of light emitted as the color temperature decreases. 2. The control unit has a color temperature of 4000 to 700.
2. The color temperature variable lighting device according to claim 1, wherein the total amount of emitted light is reduced within 20% per 2000°K in a region lower than a predetermined temperature of 0°K.