JP2012089282A - Lighting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting apparatus which permit dimming and color matching to be changed freely and can maintain brightness on an irradiated plane constant with high accuracy.SOLUTION: A lighting apparatus 10 includes a plurality of light sources 11 and 12 with different light colors, a dimming switch-on circuit 15 which controls dimming and color matching by dimming the light sources 11 and 12 every light color, a brightness sensor 18 which detects brightness on a plane irradiated from the light sources 11 and 12, and an automatic dimming control circuit 19 which automatically controls dimming based on signals from the brightness sensor 18 to ensure that brightness on the irradiated plane is constant. The lighting apparatus sets a dimming/color matching mode in which the light sources 11 and 12 of each light color are dimmed and have their light colors matched independently of each other and an automatic dimming mode in which the brightness on the irradiated plane is held constant while the dimming ratios between the respective light colors are fixed and the light color ratios are maintained.

Description

  The present invention relates to a lighting fixture that automatically controls the brightness of a room by detecting the illuminance between artificial light from lighting and natural light such as outside light entering from a window.

2. Description of the Related Art Conventionally, there has been known a luminaire that is equipped with a brightness sensor and performs dimming so as to keep the illuminance in the room constant using outside light or the like entering from a window (for example, see Patent Document 1).
In the conventional lighting apparatus described in Patent Document 1, the lighting device turns on the light source, the illuminance detection unit detects the illuminance of the irradiated surface by the light source, and the control unit is based on the illuminance detection value by the illuminance detection unit. It has an illuminance constant control function for controlling the light output so as to make the detected illuminance value constant in accordance with the illuminance target value for controlling the light output of the light source and setting the illuminance of the irradiated surface to a predetermined value. And the conventional lighting fixture described in patent document 1 is a reference curve which is an illuminance reference value corresponding to each dimming level in which the control unit changes the dimming level in the state of the standard irradiated surface. Using the correction coefficient calculated based on the reflectance of the actual irradiated surface, calculate and set the illuminance target value during constant illuminance control, and use the light source output when the light output of the light source is stable as the correction coefficient. Alternatively, a value calculated based on the detected illuminance value of the irradiated surface is used.

JP 2010-49834 A (FIG. 2, claim 1)

The lighting fixture described in Patent Document 1 described above can prevent excessive lamp output in constant illumination control and can save energy.
By the way, like the lighting fixture described in Patent Document 1 described above, a high-efficiency lighting fixture that employs a high-efficiency and small-sized LED as a light source and lights a plurality of LEDs side by side has been proposed. .
Such conventional lighting fixtures can freely control toning and dimming by using LEDs having different light colors and switching light of LEDs having different light colors while dimming.
However, in a conventional lighting fixture, it is not possible to perform correct control if control is performed to keep room illuminance constant while dimming by combining a dimming function and a brightness sensor.
This is because, in the conventional lighting fixture, the spectral sensitivity of the illuminance sensor of the illuminance detection unit varies depending on the light color. In particular, it becomes a problem when combined with a light source having a sharp peak at a specific wavelength such as an LED.

As shown in FIG. 4, in the conventional lighting fixture, the spectral sensitivity of the LED having a light color different from the spectral sensitivity of the illuminance sensor is mainly emitted from the LED of the light bulb color light source having a peak near 620 nm. The LED of the daylight color light source mainly emits two lights having peaks at around 460 nm and around 560 nm. On the other hand, the illuminance sensor detects light emission in the vicinity of 380 to 630 nm. For example, even if a daylight color LED and a light bulb color LED that emit light with the same brightness are detected, the daylight color LED is detected. However, the detected value is larger than that of the light bulb color LED.
Therefore, when the conventional lighting fixture performs color matching by performing constant illumination control, the illumination detection value of the illumination sensor changes and cannot be controlled constantly.
When light control is performed with the toning ratio kept constant, the absolute illuminance changes, but the spectral sensitivity characteristic does not change, so the light control ratio and the sensor sensitivity are proportional.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to illuminate that can freely switch between dimming and toning and can keep the brightness of the irradiated surface constant with high accuracy. To provide an instrument.

  A luminaire according to the present invention includes a plurality of light sources having different light colors, a dimming lighting circuit for dimming and toning light by dimming the light sources for each light color, and a surface to be irradiated from the light sources. A brightness sensor for detecting brightness; and an automatic dimming control circuit that automatically performs dimming control so that the brightness of the irradiated surface is constant according to a signal from the brightness sensor, and each light color A light control / color control mode that performs light control and color control by adjusting the light source independently of the light source, and a ratio of the light control ratio of each of the light colors, while maintaining the color control ratio. And an automatic light control mode for keeping the brightness of the surface constant.

  In the lighting fixture according to the present invention, the light control / color control mode and the automatic light control mode can be selected by a remote controller.

  The luminaire according to the present invention has a reflectance measurement function for setting an illuminance target value at the time of automatic light control, and automatically performs light control at a light control ratio at the time of reflectance measurement.

  According to the lighting fixture of the present invention, it is possible to freely switch between dimming and toning, and it is possible to keep the brightness of the irradiated surface constant with high accuracy.

The block block diagram of the lighting fixture of one Embodiment which concerns on this invention The top view of the remote controller of the lighting fixture of one Embodiment which concerns on this invention FIG. 5 is a diagram illustrating the relationship between the dimming ratio of each light color and the dimming degree in automatic dimming in the lighting fixture according to the embodiment of the present invention. Relationship diagram between spectral sensitivity of illuminance sensor and spectral sensitivity of LED light sources with different light colors in conventional lighting fixtures

Hereinafter, a lighting apparatus according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a lighting fixture 10 according to an embodiment of the present invention includes a first white LED (light source) 11 having a light color of at least two different light colors and a second LED (light source) 12 having a light bulb color. A first lighting circuit (lighting circuit) 13 for turning on, turning off, and dimming the first LED 11, a second lighting circuit (lighting circuit) 14 for turning on, turning off, and dimming the second LED 12, and a dimming control circuit 15, The remote controller 16, the reception circuit 17 that receives a signal generated when the user operates the remote controller 16 and instructs the dimming control circuit 15 to operate, the brightness sensor 18, and the brightness sensor 18 signal And an automatic dimming control circuit 19 that generates a dimming signal so as to control the brightness at a constant level.

  As shown in FIG. 2, the remote controller 16 keeps the toning ratio by fixing the ratio of the dimming ratio of the daytime white first LED 11 and the bulb-colored second LED 12 when pressed on the upper surface of the case 20. An automatic light control button 21 for setting an automatic light control mode for keeping the brightness of the irradiated surface constant is provided. The remote controller 16 sets, on the upper surface of the case 20, a light control / color control mode in which the first white LED 11 and the second LED 12 of the light bulb color are dimmed independently to perform dimming and toning. A light control / color control button 22 is provided. When pressed on the upper surface of the case 20, the remote controller 16 activates a reflectance measurement function for setting an illuminance target value at the time of automatic light control, and automatically performs light control at a light control ratio at the time of reflectance measurement. A reflectance correction button 23 is provided.

The remote controller 16 has a first light source button 24 for setting the first white LED 11 on the upper surface of the case 20, a second light source button 25 for setting the second LED 12 having a light bulb color, and the first light source button 24 or the second light source. A bright button 26 that increases the brightness when the button 25 is pressed, and a dark button 27 that decreases the brightness when the first light source button 24 or the second light source button 25 is pressed are further provided.
Therefore, the user can easily select the light control / color control mode and the automatic light control mode by operating the remote controller 16 at hand.

Next, operation | movement of the lighting fixture 10 is demonstrated.
If the reflectance correction button 23 of the remote controller 16 is pressed in a state where there is no external light before automatic light control, the toning ratio at the time when the reflectance correction button 23 is pressed, that is, day white The ratio of the dimming ratio between the first LED 11 and the second LED 12 of the light bulb color is transmitted to the dimming control circuit 15 through the receiving circuit 17 and stored therein.
At the same time, lighting is performed at the maximum light output while the color adjustment ratio is maintained, and the sensor voltage at that time is stored in the light adjustment control circuit 15. Specifically, the higher one of the daylight white first LED 11 and the light bulb color second LED 12 is turned on at 100%, and the color adjustment ratio of the day white first LED 11 and the light bulb color second LED 12 is adjusted. The lower one is dimmed while maintaining the dimming ratio.
For example, if the first white LED 11 is turned on at 80% and the second LED 12 is turned on at 40%, the dimming ratio is expressed by the following equation.

When the reflectance correction button 23 is pressed in this state, the first white LED 11 having a high dimming ratio is turned on at 100%, and the second LED 12 having a light bulb color is turned on at 50% while maintaining the dimming ratio 0.5. In this state, the measurement value of the brightness sensor 18 is stored in the automatic light control circuit 19.
Therefore, the reflectance measurement function activated by pressing the reflectance correction button 23 is used to measure the light color at the time of automatic dimming as the correction coefficient of the target illuminance value by measuring the reflectance of the space where the lighting fixture 10 is installed. The dimming ratio at the time of storage is used, and automatic dimming is performed according to the dimming ratio of the user by automatically dimming with the dimming ratio.

As shown in FIG. 3, when the automatic dimming mode is set by pressing the automatic dimming button 21 of the remote controller 16 thereafter, the daylight white first LED 11 is maintained while maintaining the toning ratio 0.5. The brightness is controlled so that the sensor voltage becomes constant while the light bulb-colored second LED 12 is continuously dimmed.
Therefore, by selecting the automatic dimming mode, the ratio of the dimming ratio between the daylight white color and the light bulb color is fixed, and the brightness of the irradiated surface is kept high with the toning ratio maintained. Can be kept constant.

At this time, when the light control / color control button 22 is pressed, the automatic light control is canceled and the light control / color control mode is set. Then, when the first light source button 24, the second light source button 25, the bright button 26, and the dark button 27 are pressed by the user, dimming control and toning control according to the user's intention are performed. Done.
Accordingly, since the daylight white first LED 11 and the light bulb color second LED 12 are dimmed independently by selecting the dimming / toning mode, the dimming and toning can be switched freely.

  The lighting fixture 10 fixes the toning ratio at the time of automatic dimming to the setting at the time of reflectance correction, and thereafter performs automatic dimming. However, at the time of automatic dimming, the daylight white first LED 11 and the light bulb color second LED 12 All can be lit with the same dimming ratio. In this case, at night when there is no external light, the daylight white first LED 11 and the light bulb color second LED 12 are turned on at 100%.

  As described above, according to the lighting apparatus 10 of the embodiment, when the automatic light control mode is selected, the ratio of the light control ratios of the daylight white color and the light bulb color are fixed and the color control ratio is adjusted. Thus, the brightness of the irradiated surface can be kept constant with high accuracy while maintaining. Moreover, according to the lighting fixture 10 of one embodiment, when the light control / color control mode is selected, the daylight white first LED 11 and the light bulb color second LED 12 are independently light controlled. Toning can be switched freely.

  Further, according to the lighting apparatus 10 of the embodiment, the user can easily select the light control / color control mode and the automatic light control mode by operating the remote controller 16 at hand.

  And according to the lighting fixture 10 of one Embodiment, the reflectance of the space in which the lighting fixture 10 was installed is changed into the light color at the time of automatic light control by the reflectance measurement function started by pressing down the reflectance correction button 23. Is measured and stored as a correction coefficient for the illuminance target value, and the light is adjusted automatically according to the user's preferred color by automatically adjusting the light according to the light adjustment ratio.

  In the lighting fixture of the present invention, the first lighting circuit, the second lighting circuit, the receiving circuit, the brightness sensor, and the like are not limited to the above-described embodiment, and appropriate modifications and improvements can be made. .

10 lighting equipment 11 first LED (light source)
12 Second LED (light source)
15 Dimming control circuit (dimming lighting circuit)
16 Remote controller 18 Brightness sensor 19 Automatic light control circuit

Claims (3)

A plurality of light sources having different light colors;
A dimming lighting circuit for dimming and toning by dimming the light source for each light color;
A brightness sensor for detecting the brightness of the irradiated surface from the light source;
An automatic dimming control circuit that automatically performs dimming control so that the brightness of the irradiated surface is constant by a signal from the brightness sensor;
A light control / color control mode for performing light control and color control by independently adjusting the light source of each light color;
A lighting fixture having an automatic dimming mode in which the ratio of the dimming ratio of each light color is fixed and the brightness of the irradiated surface is kept constant while the toning ratio is maintained. The lighting fixture according to claim 1,
A lighting fixture capable of selecting the light control / color control mode and the automatic light control mode by a remote controller. The lighting fixture according to claim 1 or 2,
A luminaire having a reflectance measurement function for setting an illuminance target value at the time of automatic light control, and automatically adjusting light by a light control ratio at the time of reflectance measurement.

Images