JP2005050769A - Lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device whose color temperature can be changed, while keeping light flux approximately constant, using a simple control. <P>SOLUTION: When the color temperature is at 3,000°K, an electric bulb color light lamp L is lighted at a dimming ratio of 100%, and a daylight color lamp D and a blue light lamp B are turned off. When the color temperature is raised from 3,000°K, the electric bulb color light lamp L increases its dimming ratio, to decrease its light quantity and contrarily the daylight color lamp D decreases its dimming ratio to increase its light quantity according to the color temperature. At the color temperature of A point or higher where the dimming ratio of the lamp D becomes 100%, the lamp B having blue light is lighted and its dimming ratio is decreased gradually according to the color temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an illumination device used for main illumination in a room such as an office or a house.

  Conventionally, in order to change the light color of the illumination in order to change the atmosphere of the room in the room, it is common to use a lamp installed in the illumination device by replacing it with a lamp of a desired light color. . However, in this case, it is necessary to replace the lamp every time the light color is changed, and it is difficult to change frequently.

  Therefore, in order to solve the above problems, as a first conventional example, lamps of three primary colors of red, green and blue are installed in one lighting device, and the mixture ratio of the dimming amount of each lamp is continuously changed. A lighting device has been proposed.

As a second conventional example, one of red and blue lamps is used in a state in which white lamps are always lit using three types of lamps of white, red and blue. There is also an illumination device that changes the color temperature by adjusting the amount of light alone. (For example, see Patent Document 1)
Next, as a third conventional example in which the light color to be changed is limited to a predetermined color temperature range and instead a large amount of light flux is obtained, each of a light bulb color with a color temperature of 3000K and a daylight color with 6500K is used. Some lamps are used to adjust the color temperature within the range of the light bulb color and the daylight color by dimming and combining them. (For example, see Patent Document 2)
In order to make the light on the lower surface of such an illumination device uniform, a milky white panel may be attached.
JP-A-4-154086 (page 2 lower left row 14 lines to page 3 lower left row 3 lines, FIGS. 1 and 4) JP-A-8-64367 (paragraph numbers [0025] to [0031], FIGS. 1 to 3)

  However, in the above conventional example 1, it is necessary to use three lamps of the three primary colors of red, green, and blue, and each has a small luminous flux. Therefore, even if the luminous fluxes of the three lamps are combined, one white lamp is required. It was possible to obtain only about a luminous flux, and the lighting device was very inefficient. Further, the control is complicated in order to obtain a desired color temperature by changing the dimming ratio of the three color lamps.

  In the above conventional example 2, the white lamp is always lit, so the control is simple. However, the luminous flux changes according to the increase or decrease of the light quantity of the red and blue lamps, and the change range of the color temperature. The lighting could not be operated with a constant luminous flux.

  In the above conventional example 3, the color temperature can be changed by using two lamps with a luminous flux of about one ordinary white lamp, and the illumination apparatus is more efficient than the case of using three primary color light sources. However, in general, the daylight color lamp has a luminous flux of 3240 lm in the case of, for example, an FLR40 type fluorescent lamp, whereas the light bulb color lamp has 3450 lm, and the daylight color lamp in the case of an FHF32 type fluorescent lamp has 4650 lm. The light bulb color lamp is 4950 lm, and its luminous flux is lower than that of the light bulb color lamp. When the color temperature is changed to a high color temperature, the luminous flux decreases, and illumination is performed with a constant luminous flux within the change range of the color temperature. In some cases, the lighting design could not be operated.

  In addition, when a milky white panel is attached to make the light on the lower surface of the lighting device uniform, the milky white panel has poorer transmission characteristics of the blue component on the short wavelength side than the red component on the long wavelength side. In addition, when the light passes through the panel, the blue component is relatively reduced, the color temperature obtained as a lighting device is lowered, and light having a high color temperature cannot be obtained.

  The present invention has been made in view of the above-described reasons, and an object of the present invention is to provide an illuminating device capable of changing the color temperature while maintaining a substantially constant luminous flux with simple control.

  The invention of claim 1 includes a plurality of light sources having different light colors, a lighting device capable of dimming each light source, and a control unit that changes the color temperature by controlling the dimming amount of each light source, The plurality of light sources are a light source having a warm color temperature, a light source having a cold color temperature, and a blue light source. When the color temperature is increased, the dimming ratio of the warm color light source is reduced. Increasing the dimming ratio of the cold color light source substantially simultaneously and lowering the color temperature substantially simultaneously increasing the dimming ratio of the warm color light source and decreasing the dimming ratio of the cold color light source. The color temperature can be changed with simple control while maintaining a substantially constant light flux.

  According to a second aspect of the present invention, in the first aspect, the warm color light source is a light bulb color, and the cold color light source is a daylight color, and a warm color light source and a cool color system are used at a color temperature of about 3000K to 6500K. The color temperature can be continuously changed by controlling each dimming ratio of the light source.

  According to a third aspect of the present invention, in the first or second aspect, when the color temperature is increased, the control unit decreases the dimming ratio of the warm color light source and increases the dimming ratio of the cold color light source. At the same time, it is characterized by increasing the dimming ratio of the blue light source by turning on the blue light source on the high color temperature side from the point when the dimming ratio of the cold color light source reaches 100%. Can do.

  According to a fourth aspect of the present invention, in the first or second aspect, when the color temperature is increased, the control unit reduces the dimming ratio of the warm color light source and increases the dimming ratio of the cold color light source. At the same time, from the time when the dimming ratio of the warm color light source becomes 0%, the blue color light source is turned on at the high color temperature side to increase the dimming ratio of the blue light source, and it is changed to the high color temperature. Can do.

  According to a fifth aspect of the present invention, the ratio of increasing or decreasing the dimming ratio of the warm color light source and the ratio of increasing or decreasing the dimming ratio of the cold color light source are the light amount of the warm color light source and the cold color system. The ratio is such that the total amount with the light amount of the light source is constant, and the luminous flux can be made more constant with respect to changes in color temperature.

  The invention of claim 6 is characterized in that, in claim 4, the ratio for increasing or decreasing the dimming ratio of the warm color light source and the ratio for increasing or decreasing the dimming ratio of the cold color light source are the same. It is possible to easily set the change of the control, and to simplify the control.

  The invention according to claim 7 is the warm color system according to any one of claims 1 to 6, wherein the control unit performs dimming while maintaining a constant color temperature when the light amount is smaller than when the light amount is large. It is characterized by increasing the luminous flux ratio of the light source, and light control can be performed while maintaining a constant color temperature.

  As described above, the present invention has an effect that the color temperature can be changed with a simple control while maintaining a substantially constant light flux.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in the block configuration of FIG. 1, the lighting device of the present embodiment includes one each of a light bulb color lamp L having a color temperature of 3000K, a daylight color lamp D having a color temperature of 6500K, and a lamp B having a blue light color. Provided. The lighting devices 10L, 10D, and 10B are connected to the lamps L, D, and B, respectively, and the lighting devices 10L, 10D, and 10B use the AC power supply AC as an input to dimm the lamps L, D, and B, respectively. . These lamps L, D, B and lighting devices 10L, 10D, 10B are housed in the same lighting fixture 1. The lamps L, D, and B have an x-coordinate and y-coordinate in the UCS chromaticity diagram, and the maximum luminous flux is a light bulb color lamp L: (x = 0.435, y = 0.401, luminous flux 4950 lm), daylight color Lamp D: (x = 0.310, y = 0.326, luminous flux 4650 lm), blue lamp B: (x = 0.100, y = 0.080, luminous flux 1100 lm) Has been. And lighting device 10L, 10D, 10B is connected to the controller 2 provided outside the lighting fixture 1, and the controller 2 controls lamp L, D, by controlling the light control amount of lighting device 10L, 10D, 10B. The desired color temperature is obtained by changing the dimming ratio of B.

  Next, a color temperature control method by the controller 2 will be described with reference to FIG. First, the user controls the controller 2 to set a desired color temperature. For example, when a color temperature of 3000K is set, the color temperature 3000K is obtained by setting the dimming ratio of the light bulb color lamp L to 100% and turning off the other lamps D and B. When the color temperature is higher than 3000K, the dimming ratio of the light bulb color lamp L is lowered as the color temperature is increased, and at the same time, the dimming ratio of the daylight color lamp D is increased. At this time, the lamp B having the blue light color is turned off. That is, when the color temperature is 3000K, the light bulb color lamp L is turned on at a dimming ratio of 100%, the lamps D and B are turned off, and the light bulb color lamp is increased as the color temperature is increased from 3000K. L lowers the dimming ratio to lower the amount of light, and at the same time, the daylight lamp D increases the dimming ratio to increase the amount of light. At this time, the daylight color lamp D has a smaller amount of light than the light bulb color lamp L. Therefore, the rate at which the light amount of the lamp D increases is larger than the rate at which the light amount of the lamp L decreases. The luminous flux obtained by mixing the luminous fluxes is the same as the luminous flux when the bulb-shaped lamp L is turned on 100%. In this way, by changing the dimming ratio of each lamp, the color temperature can be continuously changed while keeping the light flux constant.

  However, the increase in the dimming ratio of the daylight color lamp D is faster than the decrease in the dimming ratio of the light bulb color lamp L. Therefore, the point A at which the dimming ratio of the lamp D becomes 100% (color temperature: about At a color temperature of 5800 K) or more, the dimming ratio of the daylight lamp D is constant, the dimming ratio of the lamp lamp L is decreasing, and the luminous flux obtained by mixing the luminous fluxes of the lamps L and D is Decrease. That is, it is impossible to change only the color temperature in a state where the luminous flux is constant.

  Therefore, in the region where the color temperature is higher than the point A, the lamp B having a blue light color is turned on so as to compensate for the decrease in the luminous flux of the light bulb color lamp L, and the dimming ratio of the lamp B is gradually increased. . By doing so, the color temperature can be changed while keeping the luminous flux constant up to the color temperature of 10,000 K at which the dimming ratio of the light bulb color lamp L becomes 0% and the light is turned off. After the light bulb color lamp L is extinguished, a higher color temperature can be obtained. When the color temperature is lowered, the dimming ratio of each lamp may be changed in the opposite manner.

  In the above control, the light bulb color lamp L and the daylight color lamp D are controlled until the color temperature reaches point A, and the daylight color lamp D and the lamp B having a blue light color are controlled on the higher color temperature side than the point A. Therefore, it is always necessary to control only two types of lamps, and the color temperature can be changed with simple control. Further, by turning on the lamp B, it is possible to obtain a color temperature higher than the color temperature 6500K of the daylight color lamp D, and even when the color temperature is lowered by attaching a milky white panel to the lower surface of the lighting fixture 1, it is 6500K. The color temperature can be obtained.

(Embodiment 2)
The lighting device of the present embodiment is shown in the block configuration of FIG. 1 as in the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted, and the color temperature of the controller 2 of the present embodiment is adjusted. The control method will be described below with reference to FIG. The control of the lamps L and D is the same as in the first embodiment, but when the color temperature is increased, the lamp having the blue light color from the time when the dimming ratio of the light bulb color lamp L becomes 0% and the lamp is turned off. The point which makes B light is different from Embodiment 1. There is a point in time when only the daylight color lamp D is lit on the higher color temperature side than the point A at which the dimming ratio of the daylight color lamp D becomes 100%, and the color temperature at this time is lowered to the color temperature 6500K of the lamp D. When the lamp B is controlled, it is not necessary to control the lamps L and D, and the control becomes simpler.

(Embodiment 3)
The lighting device of the present embodiment is shown in the block configuration of FIG. 1 as in the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted, and the color temperature of the controller 2 of the present embodiment is adjusted. The control method will be described below with reference to FIG. The point that the lamp B having the blue light color is turned on after the dimming ratio of the light bulb color lamp L becomes 0% and is turned off is the same as that of the second embodiment, but the dimming ratio of the lamps L and D is changed. It is different from the second embodiment in that it is increased or decreased at the same ratio. Therefore, the lamp L and the lamp D may be controlled in the same way, and the setting of the change in the light control ratio is simplified.

  In this embodiment, the rate at which the dimming ratio of the daylight color lamp D increases or decreases is smaller than that in the second embodiment, and the A ′ point at which the dimming ratio of the lamp D is 100% in this embodiment is the embodiment. 2, the color temperature is higher than the point A where the dimming ratio of the lamp D is 100%.

(Embodiment 4)
The illuminating device of this embodiment is shown by the block configuration of FIG. 1 similarly to the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted. First, in FIG. 1, when dimming while keeping the color temperature constant, the entire luminous flux is adjusted while keeping the dimming ratio of the light bulb color lamp L and the dimming ratio of the daylight color lamp D at a constant ratio. Control to lower. For example, when the lamps L and D are lit at a dimming ratio of 30% and 70%, respectively, when the total light amount is halved, the dimming ratio of each of the lamps L and D is halved to 15% and 35%. %.

  However, when the lamp is a fluorescent lamp, the obtained light color has a spectrum obtained by synthesizing the light emission from the phosphor and the emission line spectrum of mercury in the visible range (for example, 435 nm). When the lamp output is lowered from the state where the lamp is lit at a dimming ratio of 100% to reduce the amount of light, the degree of decrease in the spectral line intensity of mercury with respect to the decrease in spectrum intensity emitted by the phosphor is There is a tendency to become smaller. For this reason, when the lamp is dimmed and the output is lowered, the ratio of the blue emission line spectrum of mercury increases, and the light color becomes bluish and the color temperature increases. For example, in the case of the daylight color lamp D, the color temperature is 6000K when the dimming ratio is 100%, whereas the color temperature increases to 6700K when the dimming ratio is 20%. The light bulb color lamp L has the same tendency. Therefore, if the overall output is lowered while maintaining the ratio of the dimming ratio of the lamp L and the dimming ratio of the lamp D at the initial setting, the outputs of the lamps L and D are obtained by mixing. The light color has a higher color temperature than when the amount of light is large.

  Therefore, in order to prevent such a phenomenon, when the light of the entire lighting fixture 1 is reduced, control is performed to increase the ratio of the lamp L of the light bulb color in order to keep the color temperature constant. For example, in order to halve the amount of light when the dimming ratio between the light bulb color lamp L and the daylight color lamp D is 30% and 70%, the dimming ratio between the lamp L and the lamp D is reduced. Is turned on at 17% and 33%. That is, the ratio of the dimming ratio between the lamp L and the lamp D was initially set to 30:70, but when the amount of light was halved, the ratio of the dimming ratio between the lamp L and the lamp D was set to 34. : 66, by increasing the ratio of the light bulb color lamp L, it is possible to prevent the color temperature from becoming high and to reduce the light amount of the entire apparatus while keeping the color temperature constant.

(Embodiment 5)
The illumination device of the present embodiment uses a daylight white lamp N having a color temperature of 5000K instead of the daylight color lamp D in the block configuration of FIG. The color temperature control method by the controller 2 of this embodiment is basically the same as that of the second embodiment, and will be described below with reference to FIG. First, since the color temperature of the lamp N on the high color temperature side is lower than that of the daylight color lamp D of the second embodiment, the point A ″ at which the dimming ratio of the lamp N becomes 100% is the dimming ratio of the lamp D. Is shifted to a lower color temperature side than the point A at which 100% becomes 100%. Since the lamp N can obtain the same luminous flux as the light bulb color lamp L, the decrease in the dimming ratio of the lamp L and the increase in the dimming ratio of the lamp N are changed at the same rate up to a color temperature of 5000K. Just do it.

  In the present embodiment, the color temperature can be freely changed within a commonly used color temperature range of 3000K to 5000K. Further, on the high color temperature side, a sufficient luminous flux can be obtained at a sufficiently high color temperature up to about 8000 K by turning on the lamp B having a blue light color.

(Embodiment 6)
The block configuration of the illumination device of this embodiment is shown in FIG. 6, and the difference from FIG. 1 is that there are two lighting lamps L and two daylight lamps D, and lighting devices corresponding to the respective lamps. As shown in FIG. 1, one lamp B having a blue light color is used. As in the first embodiment, the controller 2 controls the dimming ratio for each lamp via each lighting device, so that the upper limit of the color temperature is lower than that in the first embodiment. In the range of 3000K to 6500K, it is possible to obtain a luminous flux equivalent to two light bulb color lamps L, and to obtain a luminous flux equivalent to that of a general base lighting fixture, and it can be used without any problem for main illumination.

  In addition, a light bulb color lamp L and a daylight color lamp D are arranged in parallel on both sides of the blue light lamp B, and can be arranged in the order of D, L, B, L, and D with the lamp B in the center. Therefore, there is little color unevenness on the light emitting surface of the lighting fixture 1, and the lighting device has high uniformity.

It is a figure which shows the structure of the illuminating device of Embodiment 1 of this invention. It is a figure which shows the change of the light control ratio with respect to color temperature same as the above. It is a figure which shows the change of the light control ratio with respect to the color temperature of the illuminating device of Embodiment 2 of this invention. It is a figure which shows the change of the light control ratio with respect to the color temperature of the illuminating device of Embodiment 3 of this invention. It is a figure which shows the change of the light control ratio with respect to the color temperature of the illuminating device of Embodiment 5 of this invention. It is a figure which shows the structure of the illuminating device of Embodiment 6 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Controller 10L, 10D, 10B Lighting device L Light bulb color lamp D Daylight color lamp B Lamp with blue light color AC AC power supply

Claims (7)

A plurality of light sources having different light colors, a lighting device capable of dimming each light source, and a control unit that changes the color temperature by controlling the dimming amount of each light source. When the color temperature is high, the dimming ratio of the warm color light source is reduced and the dimming temperature of the cold color light source is adjusted. The illumination is characterized in that when the color temperature is lowered by increasing the ratio substantially simultaneously, increasing the dimming ratio of the warm color light source and decreasing the dimming ratio of the cold color light source are performed substantially simultaneously. apparatus. The lighting device according to claim 1, wherein the warm color light source has a light bulb color, and the cold color light source has a daylight color. The controller simultaneously reduces the dimming ratio of the warm color light source and increases the dimming ratio of the cold color light source when the color temperature is increased, so that the dimming ratio of the cold color light source is 100%. 3. The lighting device according to claim 1, wherein the light source is turned on at a high color temperature side to increase the dimming ratio of the blue light source. When the color temperature is increased, the control unit simultaneously reduces the dimming ratio of the warm color light source and increases the dimming ratio of the cold color light source, so that the dimming ratio of the warm color light source becomes 0%. 3. The lighting device according to claim 1, wherein the light source is turned on at a high color temperature side to increase the dimming ratio of the blue light source. The ratio for increasing / decreasing the dimming ratio of the warm color light source and the ratio for increasing / decreasing the dimming ratio of the cold color light source are such that the sum of the light amount of the warm color light source and the cold light source is constant. The lighting device according to claim 3 or 4. 5. The lighting device according to claim 4, wherein a ratio for increasing or decreasing the dimming ratio of the warm color light source and a ratio for increasing or decreasing the dimming ratio of the cold color light source are the same. The control unit increases the luminous flux ratio of the warm color light source when the light amount is smaller than when the light amount is large when dimming while maintaining a constant color temperature. 6. The lighting device according to any one of 6.

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