JP2013008501A - Lighting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide lighting equipment that can perform constant brightness control with high precision.SOLUTION: Lighting equipment 10 has plural light sources 11, 12 different in light color, lighting control turn-on circuits 13, 14 for performing lighting control on the light sources 11, 12 every light color to perform lighting control and color matching, a brightness sensor 15 for detecting the brightness of an irradiation target face from the light sources 11, 12, and an automatic lighting control circuit 16 for automatically performing lighting control on the basis of a signal from the brightness sensor 15 so that the brightness of the irradiation target face is constant. In order to set an irradiation target value under automatic lighting control, one light source 11 is turned on to measure reflectivity, and the lighting control is performed by using a calculated irradiation target value under lighting control and color matching.

Description

  The present invention relates to a luminaire that automatically controls brightness by detecting the illuminance of light from illumination and outside light entering through a window, and in particular, when adjusting light by adjusting light sources of a plurality of light colors. The present invention also relates to a lighting apparatus that automatically controls the brightness of the room.

2. Description of the Related Art Conventionally, there is known a luminaire that includes a lighting device that turns on a light source and an illuminance detection unit that detects the illuminance of an irradiated surface by the light source, and controls the light output of the light source based on the illuminance detection value by the illuminance detection unit. (For example, refer to Patent Document 1).
Patent Document 1 includes a control unit having an illuminance constant control function for controlling brightness so that an illuminance detection value becomes constant in accordance with an illuminance target value for setting the illuminance of an irradiated surface to a predetermined value.

In Patent Document 1, the control unit sets the reference curve that is the illuminance reference value corresponding to each dimming level obtained by changing the dimming level in the state of the standard illuminated surface, and the reflectivity of the actual illuminated surface. An illuminance target value at the time of constant illuminance control is calculated and set using the correction coefficient calculated on the basis of the correction coefficient.
In Patent Document 1, the illuminance target value at the time of constant illuminance control is calculated and set using the reference curve and the correction coefficient, thereby keeping the illuminance in the room constant.

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

  Patent Document 1 can automatically adjust light so as to keep the illuminance in the room constant by using outside light or the like entering from a window, can prevent excessive lamp output in constant illuminance control, and can save energy.

By the way, in recent years, high-efficiency lighting fixtures have been proposed in which a plurality of high-efficiency and small light sources such as LEDs are turned on side by side.
Furthermore, there has been proposed a lighting fixture that can freely control toning and dimming by switching light sources having different light colors while dimming using light sources having different light colors.
Such conventional luminaires are provided with light sources of daylight color and light bulb color, and are adjusted by changing the dimming ratio of each light source, and are dimmed by maintaining the dimming ratio of each color. Dimming is possible while maintaining the color ratio.

However, if such a lighting device with a toning function and a brightness sensor are combined and control is performed to keep the room illuminance constant while toning, the control may not be performed correctly.
This is because the spectral sensitivity of the sensor of the illuminance detector varies depending on the light color. This occurs particularly when combined with a light source having a sharp peak at a specific wavelength, such as an LED.

As shown in FIG. 5, such a conventional lighting apparatus 100 mainly emits light having a peak near 620 nm in the light bulb color LED in the spectral sensitivity of the brightness sensor and the spectral sensitivity of the LED having different light colors. It is.
On the other hand, such a conventional luminaire 100 mainly emits two lights having peaks at around 460 nm and around 560 nm in a daylight color LED.

On the other hand, in such a conventional lighting apparatus 100, the brightness sensor detects light emission in the vicinity of 380 to 630 nm.
Therefore, even if such a conventional lighting fixture 100 detects the light of daylight color and light bulb color LED emitting at the same brightness, the detection value of the daylight color LED is larger than that of the light bulb color LED. Become.
Therefore, even if such a conventional lighting fixture 100 performs the illuminance constant control, if toning is performed, the illuminance detection value of the sensor changes, and it becomes impossible to perform the constant control.

Furthermore, in such a conventional lighting fixture 100, when the illuminance is different between when it is lit 100% only in the daylight color and when it is lit 100% only in the light bulb color, the illuminance target value for controlling the illuminance is respectively Depending on the light color.
In addition, when the conventional lighting fixture 100 mixes the daylight color and the light bulb color to adjust the illuminance target value depending on the toning ratio, the illuminance target value cannot be controlled correctly.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a lighting apparatus that can perform constant brightness control with high accuracy.

  The luminaire according to the present invention includes a plurality of light sources having different light colors, a dimming lighting circuit for dimming and toning the light source by dimming the light source for each light color, and brightness of an irradiated surface from the light source. A brightness sensor that detects the brightness, and an automatic light control circuit that automatically performs light control so that the brightness of the irradiated surface is constant according to a signal from the brightness sensor. In order to set the illuminance target value, a certain light source is turned on, the reflectance is measured, and dimming control is performed using the illuminance target value at the time of light control and color adjustment obtained by calculation.

  The luminaire according to the present invention includes the illuminance target value at the time of dimming and toning, the illuminance ratio when the light source is fully lit, the sensitivity ratio of the brightness sensor to the light source, and the light source when lit. It is determined from the dimming ratio and the measured value of the reflectance.

  According to the lighting fixture concerning this invention, there exists an effect that brightness constant control can be performed with high precision.

The block block diagram of the lighting fixture of one Embodiment which concerns on this invention FIG. 5 is a diagram illustrating the relationship between the illuminance and the color mixture ratio when the illuminance of a plurality of light sources is linearly increased / decreased in the lighting fixture according to the embodiment of the present invention FIG. 5 is a diagram showing the relationship between the toning sensor voltage and the toning ratio in the state of the standard irradiated surface when there is no external light in the lighting apparatus according to the embodiment of the present invention. FIG. 5 is a diagram illustrating the relationship between the sensor voltage and the dimming ratio when the dimming ratio of the plurality of light sources is kept constant in the lighting fixture of the embodiment according to the present invention. Relationship diagram between the spectral sensitivity of the brightness sensor of conventional lighting fixtures and the spectral sensitivity of light sources with different light colors

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 light source 11 that is an LED that emits a first light color of daylight color, and a second light bulb color that is different from the first light color. And a second light source 12 that is an LED that emits light color.
In addition, the lighting fixture 10 includes a first lighting circuit 13 that is a dimming lighting circuit that performs dimming and toning by adjusting the first light color of the first light source 11, and the second light color of the second light source 12. And a second lighting circuit 14 that is a dimming lighting circuit that performs dimming and color adjustment by dimming the light.

The luminaire 10 has a brightness sensor 15 that detects the brightness of the irradiated surface from the first light source 11 and the second light source 12, and the brightness of the irradiated surface is constant by a signal from the brightness sensor 15. And an automatic dimming control circuit 16 that automatically performs dimming control.
Furthermore, in order to set the illuminance target value at the time of automatic dimming by the automatic dimming control circuit 16, the luminaire 10 measures the reflectance by turning on the first light source 11, and the dimming and toning obtained by calculation A dimming control circuit 17 that performs dimming control using the illuminance target value at the time is provided.
In addition, in the lighting fixture 10, the dimming control circuit 17 sets the illuminance target value for dimming and toning, the illuminance ratio when the first light source 11 is fully lit, and the brightness sensor 15 for the first light source 11. It is obtained from the sensitivity ratio, the dimming ratio of the first light source 11 at the time of lighting, and the measured value of reflectance.

In the lighting fixture 10, the first light source 11 and the second light source 12 can be dimmed continuously, and the first light source 11 and the second light source 12 are dimmed to change the toning ratio. Can do.
Since the luminaire 10 includes the brightness sensor 15, the illuminance in the room can be controlled to be constant.
In order to correct the sensitivity of the brightness sensor 15 in the indoor environment, the luminaire 10 lights the first light source 11 100% at the time of installation, and sets the correction value with the sensor voltage at that time.
The lighting fixture 10 calculates | requires an illumination intensity target value by calculation at the time of light control and toning.

  The method of controlling the toning of the lighting fixture 10 is that when the first light source 11 of daylight color is turned on at the maximum output and the second light source 12 is turned on (or turned off) at the minimum output, the color is adjusted to the second light source 12 side of the light bulb color. The output of the second light source 12 is increased at the same time as the output of the first light source 11 is decreased.

Next, the case where the illumination intensity of the 1st light source 11 and the 2nd light source 12 is increased / decreased linearly, for example is demonstrated.
As shown in FIG. 2, the illuminance of the first light source 11 and _{L 1,} the illuminance of the second light source 12 as _{L 2,} the maximum illumination intensity of the first light source 11 and _L 1 max, the maximum illuminance of the second light source 12 Let L ₂ max.
The mixed color output is the sum of the first light source 11 and the second light source 12, and the illuminance L changes linearly.
That is, the toning ratio a is defined as 0 when only the first light source 11 is lit, and is defined as 1 when only the second light source 12 is lit, and when the dimming ratio a changes from 0 to 1, The illuminance L ₁ of one light source 11 is obtained by the following mathematical formula 1.

Further, the illuminance L ₂ of the second light source 12 is obtained by the following mathematical formula 2.

The mixed color illuminance L _s at this time is obtained by the following Equation 3.

Also, if the maximum luminance _L 1 maximum illumination of the second light source 12 with respect to max _L 2 max of the first light source 11 is small, when the magnification m times (m <1), the maximum luminance L of the second light source 12 ₂ max is obtained by the following mathematical formula 4.

The mixed color illuminance L _s at this time is obtained by the following Equation 5.

Next, a description will be given of a case where color adjustment is performed in a standard irradiated surface state when there is no external light.
As shown in FIG. 3, an illuminance _{L 1} of the first light source 11 and the illumination _{L 2} of the second light source 12 is a case identical.
In this case, the sensor voltage V ₂ at the time of irradiation of the second light source 12, when the n-times of the sensor voltages V ₁ at the time of irradiation of the first light source 11 (n <1), at the maximum output of the first light source 11 The sensor voltage V ₁ max and the sensor voltage V ₂ max of the second light source 12 are obtained by the following Expression 6.

Here, the sensor voltage V _s at the time of color adjustment from the sensor voltage V ₁ max at the maximum output of the first light source 11 toward the sensor voltage V ₂ max of the second light source 12 is changed from the sensor voltage V ₁ max to the sensor voltage V _1. It changes linearly between ₂ max.
That is, the toning ratio a is defined as 0 when only the first light source 11 is turned on, and is defined as 1 when only the second light source 12 is turned on, and when the toning ratio a changes from 0 to 1, The sensor voltage V ₁ is obtained by the following formula 7.

The sensor voltage V ₂ is obtained by the following formula 8.

Therefore, the sensor voltage V _s when the standard irradiated surface is irradiated with this mixed color is obtained by the following Equation 9.

Next, a description will be given of a case where light control is performed with the light control ratio between the first light source 11 and the second light source 12 kept constant.
As shown in FIG. 4, the sensor voltage V at this time changes linearly with respect to the dimming ratio b (0 is extinguished and 1 is 100% illuminated).
From the sensor voltage V _s at the time of color matching when 100% is lit, the sensor voltage V is obtained by the following formula 10.

At this time, since the sensor voltage V is a sensor voltage based on reflection in the state of the standard irradiated surface, the reflectance of the irradiated surface in the actual installation environment of the lighting fixture 10 is measured, and the difference is calculated. The correction coefficient is k.
For example, when the lighting apparatus 10 is installed in a room, the sensor voltage when the first light source 11 is turned on 100% in a state where there is no external light as an environment setting is measured, and the sensor of the first light source 11 in a standard environment is measured. obtaining a correction value k as compared with the voltage V _1.
The sensor voltage V _r when there is no external light in the actual environment is obtained by the following formula 11.

At this time, the parameter a and the parameter b are control parameters of the first light source 11 and the second light source 12, and m is a fixed value set in advance as the lighting fixture 10.
Further, n is a value determined in advance by the specifications of the first light source 11 and the second light source 12 and the brightness sensor 15 set in the lighting fixture 10.
That is, if the correction value k is obtained in the actual use environment, the sensor voltage due to the light from the luminaire 10 can be understood even if the toning and dimming are performed.
Therefore, the illuminance target value can be set correctly in any toning / dimming state, and automatic dimming can be performed with constant illuminance even when outside light enters.

As described above, according to the lighting fixture 10 of the embodiment according to the present invention described above, the first light source 11 is turned on 100% at the time of installation for the sensitivity correction of the brightness sensor 15 in the indoor environment, and the sensor at that time The correction value k is set by voltage.
And according to the lighting fixture 10, the illumination intensity target value is calculated | required by calculation at the time of light control and toning.
Therefore, according to the lighting fixture 10, the brightness constant control can be accurately performed by measuring the reflectance of the installation environment by turning on the first light source 11.

Moreover, according to the lighting fixture 10 of one Embodiment which concerns on this invention, the illuminance target value at the time of light control and toning, the illuminance ratio at the time of the 1st light source 11 lighting, and the brightness sensor 15 with respect to the 1st light source 11 Of the first light source 11 at the time of lighting, and a measured value of reflectance.
Therefore, the illuminance target value at the time of light adjustment and color adjustment can be acquired with high accuracy.

  In addition, a brightness sensor, an automatic light control circuit, etc. in the lighting fixture of this invention are not limited to one Embodiment mentioned above, A suitable deformation | transformation, improvement, etc. are possible.

10 lighting equipment 11 first light source (light source)
12 Second light source (light source)
13 First lighting circuit (dimming lighting circuit)
14 Second lighting circuit (dimming lighting circuit)
15 brightness sensor 16 automatic dimming control circuit

Claims (2)

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 illuminated 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;
To set the illuminance target value for automatic dimming, turn on a light source, measure the reflectance, and perform dimming control using the illuminance target value for dimming and toning obtained by calculation apparatus. The lighting fixture according to claim 1,
The illuminance target value during dimming and toning, the illuminance ratio when the light source is fully lit, the sensitivity ratio of the brightness sensor to the light source, the dimming ratio of the light source when lit, and the reflectance Lighting device obtained from the measured value of

Images