JP2014212083A - Lighting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting apparatus capable of obtaining illumination light with little uncomfortable feeling under a low color temperature even when two color light-emitting devices are used.SOLUTION: The color temperature of an illumination light source 3 lowers to 2500K and the light quantity is also reduced by rotating an operation part 11 of a controller 1. When two color light-emitting devices 31 and 32 are used, at a color temperature of 2600K, particularly at 2500K or less, deviation from a black body locus of the illumination light gets further larger in the light quantity simulating a light control curve of incandescent lamp causing a larger uncomfortable feeling. Therefore, the light quantity is set to sharply lower at least at 2600K, particularly at 2500K. That is, the light control curve (light control curve of incandescent lamp) higher than the color temperature at 2600K particularly at 2500K and the light control curve at the color temperature lower than that are discontinuous.

Description

  The present invention relates to a lighting fixture including light emitting elements of two colors.

  Traditionally, bright blue-white light (light with high color temperature) such as a daylight fluorescent lamp refreshes the person's mood, but if the illumination is too low, it feels gloomy and cold, while an incandescent lamp It is known that reddish light (light with low color temperature) produces a gentle atmosphere when the illuminance is low, and it is harsh, uncomfortable and uncomfortable when the illuminance is too high (Kreuzov effect). ing. And paying attention to such a psychological effect, various illumination devices in which the light color (color temperature) of illumination light is variable are provided.

  While such a technique is provided, Patent Document 1 proposes an illumination device that can easily adjust the color temperature and the amount of illumination light.

  In the lighting device, in accordance with the operation input received by the operation input receiving unit, the determining unit increases or decreases the color temperature and the light amount of the illumination light in association with the change of the operation input in a range below the predetermined color temperature. Thus, the light quantity of each light emitting element of the illumination light source is determined. Here, the light amount of each light emitting element of the illumination light source is determined so that the color temperature of the illumination light increases or decreases in response to the change of the operation input while keeping the light amount within the predetermined range in the range above the predetermined color temperature.

  According to the above control, the color temperature and the light amount of the illumination light can be easily adjusted as compared with the operation control in which a person adjusts the light amount for each color.

  The above technique is proposed in an illumination light source having light emitting elements (light emitting diodes) of three colors of red (R), green (G), and blue (B). On the other hand, from the viewpoints of cost reduction, mitigation of variation in accuracy of light emitting elements, ease of control, etc., recently, it has been proposed to configure an illumination light source with two color light emitting elements.

  Patent Document 2 discloses a lighting device using light emitting elements of two colors as an example. This document discloses that a deviation duv from a black body locus of a straight line connecting chromaticity points (chromaticity coordinates) of two color light emitting elements falls within a predetermined range.

JP 2010-176984 A JP 2009-238729 A

  However, in an illumination light source including light emitting elements of two colors, a technique for appropriately determining the light amount of each light emitting element corresponding to a desired color temperature of illumination light is not provided. That is, in the case of two-color light-emitting elements, the illumination light obtained by mixing light emitted from each light-emitting element is more limited than in the case of three-color light-emitting elements, and it is difficult to set an appropriate color temperature and light amount.

  The present invention provides a technique for appropriately determining the amount of light of each light emitting element corresponding to the color temperature of illumination light in a lighting fixture using light emitting elements of two colors.

  A lighting apparatus according to the present invention includes a first light emitting element that emits light having a color temperature of 2700K or less and a second light emitting element that emits light having a color temperature of 5000K or more, and the first and first light sources. A light emitting element driving unit that emits light of each of the two light emitting elements individually with an arbitrary light amount, and a color temperature and a light amount of illumination light emitted from the illumination light source become a color temperature and a light amount according to an operation input from the outside A light amount determining unit that determines the light amount of each of the first and second light emitting elements, wherein the light emitting element driving unit determines the light amount of the first and second light emitting elements. The light amount determination unit defines a relationship between the color temperature and the light amount when the light amount of the first and second light emitting elements is between zero and a predetermined amount of light. Based on the first relationship, depending on the operation input The light amount determination unit determines a light amount corresponding to a color temperature, and the light amount determination unit determines a relationship between the color temperature and the light amount when a color temperature corresponding to a light amount larger than the predetermined amount of light is input by an operation input. A light amount corresponding to the color temperature is determined based on the second relationship to be defined. In the first relationship and the second relationship, the light amount increases as the color temperature increases, and the first relationship And the first maximum light amount that is the maximum light amount based on the second relationship and the minimum light amount that is the minimum light amount based on the second relationship are different values, and the minimum light amount is the first maximum value. A third amount of light that is greater than the amount of light and that has a larger amount of change with respect to the amount of change in color temperature between the first maximum amount of light and the minimum amount of light than the first relationship and the second relationship. A relationship is established.

  As an embodiment of the present invention, for example, the third relationship is established in a color temperature region of 2600K or less.

  As an embodiment of the present invention, for example, the third relationship is established at a color temperature near 2500K.

  As an embodiment of the present invention, for example, the difference between the color temperature at the first maximum light amount and the color temperature at the minimum light amount is substantially zero.

  As an embodiment of the present invention, for example, the first maximum light amount is a value of 15% or less with respect to a second maximum light amount that is a maximum light amount based on the second relationship, and the minimum The value light quantity is a value of 30% or more with respect to the second maximum light quantity.

  As one embodiment of the present invention, for example, the relationship between the amount of light larger than the second maximum amount of light and the color temperature is defined by a fourth relationship in accordance with the dimming curve of natural light.

  As one embodiment of the present invention, for example, the second relationship is in accordance with a dimming curve of an incandescent lamp.

  As an embodiment of the present invention, for example, the second relationship is established in a color temperature region of 3100K or less.

  According to the lighting apparatus according to the present invention, it is possible to obtain illumination light with a little uncomfortable feeling at a low color temperature even when two color light emitting elements are used.

The lighting fixture of embodiment of this invention is shown, (a) is a whole block diagram, (b) is a block diagram of a power supply unit, (c) is a circuit block diagram of a light emitting element drive part. The top view of the illumination light source of the lighting fixture of embodiment which concerns on this invention The figure which shows a part of xy chromaticity diagram limited to the range of x = 0.26-0.56 and y = 0.29-0.47. It is a figure which shows the light control curve which shows the relationship between the color temperature set with respect to the light of a lighting fixture, and a light quantity, (a) is a lighting control curve of the lighting fixture which has the light emitting element of the conventional 3 colors, ( b) is a dimming curve of a lighting fixture having light emitting elements of two colors according to an embodiment of the present invention. The figure which shows the light control curve of a prior art example and embodiment in color temperature 2000K-3000K. The figure which shows the dimming curve of five kinds of incandescent lamps The modification of a 3rd relationship is shown, (a) is the 3rd relationship of embodiment, (b) is an example from which a light quantity changes linearly with respect to color temperature, (c) is color temperature. On the other hand, the amount of light changes stepwise

  Hereinafter, the lighting fixture of embodiment which concerns on this invention is demonstrated with reference to drawings.

The lighting fixture 40 of this embodiment is comprised by the illumination light source 3 and the power supply unit 2 as shown to Fig.1 (a). The illumination light source 3 includes a first light emitting element (light emitting diode) 31 and a second light emitting element (light emitting diode) 32. However, the two color light emitting elements may be light emitting elements other than the light emitting diodes, for example, organic EL elements. Here, the chromaticity coordinates of the light colors of the light emitting elements 31 and 32 of the respective colors are (x ₁ , y ₁ ) and (x ₂ , y ₂ ), respectively, and the light amounts of the light emitting elements 31 and 32 are Y ₁ , If Y ₂ , the chromaticity coordinates (x ₀ , y ₀ ) and the light amount Y ₀ of the light color of the illumination light that is mixed color light are expressed by the following formula 1.

Here, since the light color (light wavelength) does not change even if the light amounts Y ₁ and Y ₂ are changed for the light emitting elements 31 and 32 made of light emitting diodes, the ratio of the light amounts Y ₁ and Y ₂ of the light emitting elements 31 and 32. The light color of the illumination light obtained as a mixed color can be changed by changing the light amount, and the light amounts Y ₁ and Y ₂ are changed while maintaining the ratio of the light amounts Y ₁ and Y ₂ of the light emitting elements 31 and 32. By doing so, it is possible to change the amount of illumination light in the same light color. Since the light amounts Y ₁ and Y ₂ of the light-emitting elements 31 and 32 formed of light-emitting diodes are determined by the amount of power supply, as described later, the amount of power supplied to the light-emitting elements 31 and 32 from the power supply unit 2 is increased or decreased as described later. Light color and light quantity can be adjusted. Here, by determining the light amounts Y ₁ and Y ₂ of the light emitting elements 31 and 32 of the illumination light source so that the chromaticity of the illumination light changes almost along the black body locus, the light color of the illumination light is changed to the color temperature. Can be specified.

The amount of light is an indicator of the brightness of the illumination light and corresponds to an amount such as a luminous flux or illuminance. The unit of luminous flux is “lm (lumen)”, and the unit of illuminance is “lx (lux)” or “lm / m ² (lumen per square meter)”.

  As shown in FIG. 1B, the power supply unit 2 includes a control signal input unit 20 to which a control signal is input from a controller 1 described later, and an alternating current that converts an alternating current voltage fed through the controller 1 into a desired direct current voltage. / DC converter 21, first light emitting element driver 22A (light emitting element driver) for driving first light emitting element 31, and second light emitting element driver 22B (light emitting element) for driving second light emitting element 32. Drive unit) and a drive signal conversion unit 23 that converts a control signal input to the control signal input unit 20 into a drive signal to be supplied to the first light emitting element driving unit 22A and the second light emitting element driving unit 22B. Yes.

  The first light emitting element driving unit 22A and the second light emitting element driving unit 22B have a common configuration, and as shown in FIG. 1C, the output terminal on the high potential side of the AC / DC converting unit 21 and the light emission. The source is connected to the current limiting resistor R inserted between the anodes of the elements 31 and 32, the cathodes of the light emitting elements 31 and 32, and the drain is the output terminal (ground) on the low potential side of the AC / DC converter 21. ) Connected to the switching element Q1 and a waveform shaping circuit for shaping the drive signal output from the drive signal conversion unit 23. This waveform shaping circuit is well known in the art, and includes a PNP bipolar transistor Tr1 having a collector connected to the output terminal on the high potential side of the AC / DC converter 21 and an emitter connected to the gate of the switching element Q1. The NPN type bipolar transistor Tr2 has a collector connected to the gate of the switching element Q1 and an emitter connected to the ground. The drive signal input to the bases of the two transistors Tr1 and Tr2 connected in parallel is waveform-shaped. Output to the gate of the switching element Q1. Here, the drive signal conversion unit 23 outputs a drive signal composed of a rectangular wave signal having a constant cycle with a variable on-duty ratio, thereby switching the switching elements of the first light emitting element driving unit 22A and the second light emitting element driving unit 22B. The amount of power supplied to the light emitting elements 31 and 32 is adjusted by PWM (pulse width modulation) control of Q1. Accordingly, the first light emitting element driving unit 22A and the second light emitting element driving unit 22B function as a light emitting element driving unit that causes the first light emitting element 31 and the second light emitting element 32 to emit light individually and with an arbitrary amount of light. .

  In the lighting fixture 40 of this embodiment, the illumination light source 3 is packaged together with the connector 36 as a housing unit 34 with a connector. The connector-equipped housing unit 34 can be easily connected to the power supply unit 2 via the connector 36. And the lighting fixture 40 is connected with the controller 1, and comprises an illumination system (apparatus) as a whole.

The controller 1 has a housing 10 made of a box-shaped synthetic resin molded product, and a cylindrical operation portion 11 and a power switch operation button 12 are arranged on the front surface of the housing 10 (FIG. 1).
(See (a)). The power switch (not shown) includes a tumbler switch and a push button switch, and opens and closes a power feeding path from the AC power supply AC to the power supply unit 2. A control signal generator (not shown) that generates a control signal that varies depending on the operation of the operation unit 11 is housed in the housing 10. The control signal generation unit generates a control signal corresponding to the operation of the user operation unit 11 and outputs the control signal to the power supply unit 2.

  The operation unit 11 is provided so as to be rotatable with respect to the housing 10. When the user rotates the operation unit 11 clockwise or counterclockwise, the mark 11 a formed on the front surface rotates. Located in a predetermined position between two positions in the direction. The control signal from the controller varies according to this rotation.

In the power supply unit 2, the control signal output from the control signal generation unit of the controller 1 is converted into a DC voltage signal having a voltage level corresponding to the on-duty ratio (reciprocal color temperature) by the control signal input unit 20. The DC voltage signal is converted by the drive signal conversion unit 23 into drive signals for the first light emitting element drive unit 22A and the second light emitting element drive unit 22B of each color system. The drive signal conversion unit 23 includes a microcomputer and a memory, and the signal level (reciprocal color temperature) of the DC voltage signal, the color temperature calculated backward from the reciprocal color temperature, and the color of the illumination light corresponding to the color temperature. The degree coordinate (x ₀ , y ₀ ), the ratio of the light amounts Y ₁ and Y ₂ of the light emitting elements 31 and 32 corresponding to the chromaticity coordinates, and the correspondence relationship of the light amounts Y ₁ and Y ₂ of the light emitting elements 31 and 32 Is stored in the memory, and the microcomputer converts the DC voltage signal into a drive signal based on the conversion table.

  The control signal input unit 20 and the drive signal conversion unit 23 make the color temperature and the light amount of the illumination light from the illumination light source 3 become the color temperature and the light amount according to the operation input of the operation unit 11 that is an operation input from the outside. In addition, a light amount determining unit that determines the light amounts of the first light emitting element 31 and the second light emitting element 32 is configured. The light emitting element driving units (first light emitting element driving unit 22A and second light emitting element driving unit 22B) supply power to the first light emitting element 31 and the second light emitting element 32 according to the light amount determined by the light amount determining unit.

  FIG. 2 shows a plan view of the illumination light source 3. The illumination light source 3 includes a substrate 37, a first light emitting element 31, a second light emitting element 32, and two electrode pads 35 and 35. The substrate 37 is made of a ceramic base material. Each of the two electrode pads 35, 35 formed on the substrate 37 is connected to the first light emitting element driving unit 22 </ b> A and the second light emitting element driving unit 22 </ b> B of the power supply unit 2 via the connector 36. Further, a system of metal conductor circuits extending from the two electrode pads 35, 35 is formed on the substrate 37. Then, an LED (Light Emitting Diode) chip is mounted on the metal conductor circuit, and the two different colors of the first light emitting element 31 and the second light emitting element 32 are applied by applying phosphors having different colors on the LED chip. A light emitting element is formed. That is, the illumination light source 3 is provided as an LED package having these two light colors. Such an LED package is a so-called COB (Chip On Board), SMD (Surface Mount Device) or the like.

  In the present embodiment, five LED chips are arranged in series on one metal conductor circuit, and a first phosphor is formed by applying a phosphor that forms a predetermined color on three of the five chips. Three sub light emitting elements 31A, 31B, and 31C constituting the light emitting element 31 are formed in order in the vertical direction from the top of the figure. Further, the other two LED chips out of the five chips are arranged on the same metal conductor circuit, and the second light emitting element 32 is configured by applying a fluorescent material forming another color on the chip. Two sub light emitting elements 32A and 32B are formed between the sub light emitting elements 31A, 31B and 31C, respectively. That is, the first light emitting element 31 and the second light emitting element 32 are mounted on one substrate 37. In the present embodiment, since sub-light emitting elements having other colors are arranged between the sub-light emitting elements having the same color, mixing of radiated light from each sub light-emitting element is improved, and good illumination light is obtained. It is done. However, the first light emitting element 31 and the second light emitting element 32 may be mounted on each of two different substrates. There are no limitations on the number of sub-light-emitting elements and the way of arrangement.

  The first light emitting element 31 and the second light emitting element 32 have different color temperatures. In the present embodiment, the first light emitting element 31 emits light having a color temperature of 2200K, The light emitting element 32 emits light having a color temperature of 8000K. The color temperature of each light-emitting element can be appropriately set by changing the type and components of the phosphor to be applied, and the type and components of the phosphor are not particularly limited.

  FIG. 3 shows a part of a so-called xy chromaticity diagram shown limited to the ranges of x = 0.26 to 0.56 and y = 0.29 to 0.47. In this figure, the black body locus is drawn with a solid line. The black body locus is close to the locus of sunlight, and above this, it is close to the natural color of sunlight (or natural light or incandescent light), so that light that humans feel subjectively and comfortably is obtained. On the other hand, the light deviating from the black body locus tends to feel uncomfortable.

  When an illumination light source is obtained using light emitting elements (light emitting diodes) of three colors of red (R), green (G), and blue (B), by changing the ratio of the light amount of each light emitting element, It is possible to arrange the obtained irradiation light on arbitrary chromaticity coordinates in the chromaticity diagram. Therefore, when using light emitting elements of three colors, light on the black body locus can be easily obtained.

On the other hand, from the viewpoint of cost reduction or the like, it has been proposed to configure an illumination light source and a lighting fixture by the two-color light emitting elements 31 and 32 as in the embodiment of FIG. As shown in FIG. 3, the chromaticity coordinates of the first light emitting element 31 are P1 (x ₁ , y ₁ ), and the chromaticity coordinates of the second light emitting element 32 are P2 (x ₂ , y ₂ ). In this case, the color temperature of the illumination light P0 (x ₀ , y ₀ ), which is a mixed color light obtained by mixing the light of both light emitting elements, is changed by changing the ratio of the amount of light emitted from both light emitting elements. As described above, the chromaticity coordinate P1 (x ₁ , y ₁ ) of the first light emitting element 31 is located at the coordinate (yellow color) of the correlated color temperature of 2200K, and the chromaticity coordinate P2 of the second light emitting element 32. (X ₂ , y ₂ ) is located at the coordinate (white to blue color) of the correlated color temperature of 8000K.

However, in the case of light emitting elements of two colors, it is impossible to arrange the coordinates of the obtained illumination light P0 (x ₀ , y ₀ ) on arbitrary chromaticity coordinates in the xy chromaticity diagram. As represented by a straight line, it can be arranged only on a straight line connecting P1 (x ₁ , y ₁ ) and P2 (x ₂ , y ₂ ). In the lighting fixture, the first light-emitting element 31 and the second light-emitting element 31 are assumed on the assumption that the illumination light in the region of the color temperature of 2700K to 5000K that is most practically used is obtained in the vicinity of the black body locus. Generally, the light emitting element 32 is employed. In this example, the two chromaticity points P1 and P2 are located above the black body locus, and a straight line connecting the two chromaticity points P1 and P2 intersects the black body locus at coordinates P3 and P4. (P1 to P3 and P2 to P4) are on the upper side of the black body locus, and other portions (P3 to P4) are on the lower side of the black body locus. With such an arrangement relationship between the straight line and the black body locus, illumination light close to the black body locus can be obtained in the range of 2700K to 5000K.

  From the above, in order to obtain a straight line passing through the vicinity of the black body locus, at least the first light emitting element 31 is selected to emit light having a color temperature of 2700 K or lower, and the second light emitting element 32 is 5000 K or higher. Those that emit light of color temperature are selected. As an alternative to incandescent lamps, lighting fixtures (such as downlights) that use the light-emitting elements as in the embodiment are used. In the lighting fixtures in the embodiments as well, it is desired to create a space with the same atmosphere as incandescent lamps. However, incandescent lamps are often used with relatively dimming. When the incandescent lamp is dimmed, the color temperature may decrease from 2700K to 2000K depending on the degree of dimming. Accordingly, illumination light over a color temperature range of 2200K (or 2000K) to 5000K is required for a downlight or the like that substitutes for an incandescent lamp, and the first light emitting element 31 having a lower color temperature than 2700K is used. Is required.

  However, particularly in the color temperature range of 2700 K or less, the illumination light obtained by mixing the light of the first light emitting element 31 and the second light emitting element 32 has a large deviation from the black body locus. In this example, duv as a deviation greatly shifts to the plus side, the color becomes worse, and humans tend to feel uncomfortable subjectively. Here, duv is a CIE 1960 UCS chromaticity coordinate defined in JIS Z8725-1999. The deviation of u and v values from a black body locus having a corresponding color temperature is multiplied by 1000, and the target coordinate is a black body. When it is on the upper side of the locus, it is a positive value (plus; +), and when it is on the lower side, it is a value indicated as a negative value (minus;-).

  As a result of examining the inconveniences as described above, the inventors have found a technique for appropriately determining the light amount of each light emitting element corresponding to the color temperature of the illumination light even in a lighting fixture using two color light emitting elements.

  FIG. 4 shows a dimming curve showing the relationship between the color temperature and the amount of light set for the illumination light of a luminaire having a light emitting element. In particular, FIG. 4A shows an illumination having a conventional three-color light emitting element. FIG. 4B is a dimming curve of the lighting fixture according to the embodiment of the present invention. As can be seen from FIG. 4A, in the color temperature range of 5000K to 2700K, a dimming curve indicating a change in the amount of illumination light substantially similar to sunlight (or natural light or incandescent light) is drawn. In the range of the color temperature of ˜2200K, a dimming curve of illumination light showing the same light amount change as that of the incandescent lamp is drawn.

  As shown in FIG. 4A, there was no particular problem when using conventional three-color light emitting elements. However, as described with reference to FIG. 3, when two-color light emitting elements are used, in the range of 2700 K or less, the divergence (deviation) of the emission color of the illumination light from the black body locus becomes large, and humans feel uncomfortable. It becomes the color you feel (yellow becomes too strong, etc.).

  On the other hand, in the embodiment of the present invention, in order to eliminate the inconvenience as described above, the amount of illumination light is controlled as shown in FIG.

  As shown in FIG.4 (b), in the lighting fixture of embodiment, a color temperature is 2200K or less, and a light quantity is zero. As the color temperature increases to 2500K, the amount of light increases at a predetermined rate. The predetermined ratio does not need to be a constant ratio (straight line), but the amount of light continuously increases and is not discontinuous, but the increase is small. The relationship between the color temperature and the light amount here is defined as a first relationship.

  When the color temperature is 2500K, the amount of light changes discontinuously and rapidly. That is, at the moment when the color temperature exceeds 2500K from the low temperature side, the amount of light increases discontinuously and rapidly. In the range from 2500K to 2700K, the amount of light increases at a predetermined rate as the color temperature increases. In the present embodiment, the predetermined ratio is not a fixed ratio (straight line), but the amount of light with respect to the color temperature is determined by a dimming curve that follows the dimming curve of the incandescent lamp. The relationship between the color temperature and the light amount here is defined as a second relationship.

As described above, the light amount changes discontinuously and rapidly at a color temperature of 2500K. The relationship between the color temperature and the light amount here is defined as a third relationship. That is, when defining a first light quantity of the maximum value based on the relationship first maximum light amount L ₁ and described above, the maximum amount of light L ₁ of the first is the amount of light at a color temperature 2500 K. On the other hand, when the amount of the minimum value based on the second relationship defines the minimum amount of light L _2, also the minimum quantity L ₂ a quantity of at 2500 K. However, since the first relationship and the second relationship are discontinuous via the third relationship, the minimum value light amount L ₂ is larger than the first maximum value light amount L ₁ (L ₂ > L ₁ ). In the third relationship, the dimming curve changes substantially at an angle of 90 degrees, and the difference between the color temperature at the first maximum light amount L _{1 and} the color temperature at the minimum light amount L ₂ is substantially equal. Zero. That is, in this embodiment, the amount of change in the light amount (the slope of the graph) with respect to the amount of change in color temperature in the third relationship can be said to be infinite, but at least this amount of change in the third relationship is It becomes larger than the change amount of the relationship and the second relationship.

Then, the color temperature 2700 K, the light amount becomes a second maximum value amount L ₃ is the amount of the maximum value based on the second relation. In the color temperature range of 2700K to 5000K, the amount of light increases at a predetermined rate as the color temperature increases. The predetermined ratio here does not need to be a constant ratio (straight line), and the light quantity continuously increases. Here, the relationship between the light amount and the color temperature is such that the light amount is determined with respect to the color temperature by a light control curve that follows the light control curve of natural light, and light control without any sense of incongruity is possible. The relationship between the color temperature and the light amount here is defined as a fourth relationship. Amount in the color temperature 5000K is increased until use maximum amount _{L 4 (L 4> L 3} )

In the description so far, the description has been made in order from the left side of the graph of FIG. Hereinafter, the left from the right side of the graph shown in FIG. 4 (b), it will be described along the order of decreasing the using maximum light amount L ₄ the amount of light to zero.

When the mark 11a of the operation unit 11 is in the position of the maximum light quantity, the color temperature is 5000K, the light amount is the maximum amount of light _{L 4} used. When the user turns the operation unit 11 in a predetermined direction (clockwise or counterclockwise) until the mark 11a comes to a predetermined position, both the color temperature and the light amount decrease. In the color temperature range of 5000K to 2700K, especially 3300K to 2700K, which is most used practically, the flat characteristic in which the amount of illumination light is relatively maintained according to the fourth relationship is the same as the conventional example. maintain. This is because in this range, the emission color of the illumination light close to the black body locus can be obtained as described above.

  Further, the user turns the operation unit 11. At this time, in the color temperature range of 2700K to 2500K, the dimming of the illumination light is performed with a dimming curve (second relationship) that follows the dimming curve of the incandescent lamp. In the above description, in the color temperature range of 2700K or less, the deviation from the black body locus of the illumination light obtained by mixing the light of the two light emitting elements becomes large, the color becomes worse, and humans feel subjectively uncomfortable. Explained that it would be easier to feel. Here, the color temperature of 2500K is widely used as a sunset color temperature in retro lamps, low color temperature LED bulbs, outdoor HID (High Intensity Discharge) light sources, etc., and ensures a constant light quantity (light flux). This is the lowest color temperature in a space where it is necessary. At lower color temperatures, humans tend to feel uncomfortable when the light intensity is at a certain level, but at higher color temperatures, it is difficult to feel uncomfortable even if the light intensity remains at a certain level. Control is performed according to a dimming curve of an incandescent lamp capable of maintaining the amount of light.

  As the operation unit 11 rotates, the color temperature drops to 2500K and the amount of light also decreases. However, in the range of the color temperature of 2500 K or less, the amount of light following the dimming curve of the incandescent lamp further increases the divergence from the black body locus of the illumination light and increases the sense of discomfort. Therefore, in this embodiment, the amount of light is suddenly reduced based on the third relationship at 2500K. In other words, in the present embodiment, the dimming curve at the color temperature above (the dimming curve of the incandescent lamp) and the dimming curve (the first dimming curve at the color temperature below it) at the color temperature 2500K as a boundary. The relationship is discontinuous.

The degree to which the amount of light is reduced is not strictly limited. In the present embodiment, when the second maximum amount _{L 3} is 100%, the minimum amount of light _{L 2} is 40%, the first maximum value amount _{L 1} is in the 3%. The first maximum light quantity L ₁ may be a value of 15% or less (15%, 10%, 5%, 3%, etc.), but may be a value of 1% or less, and is set to a value that is as close to zero as possible. Can reduce the sense of incongruity as much as possible. Minimum quantity L ₂ is 30 percent of the second maximum value quantity L ₃ or more, preferably can be set to a value of 30% to 50%, enabling dimming control conforming to the dimming curve of an incandescent lamp Become. FIG. 4 (b) to a maximum value amount _{L 4} used as shown in, (100 + x)% and becomes, the range of x is also not particularly limited.

  When the user further turns the operation unit 11 based on the third relationship, the light amount rapidly decreases, and the color temperature and the light amount decrease based on the first relationship. When the mark 11a arrives at a predetermined position, the amount of light becomes zero (color temperature is 2200K).

  FIG. 5 shows dimming curves of the conventional example and the embodiments (Examples 1 and 2) at a color temperature of 2000K to 3000K. This curve corresponds to an enlarged portion of the color temperature 2000K to 3000K in the graph of FIG. 4, but in the actual comparative example and the embodiment, the light amount was changed (reduced) while changing (decreasing) the color temperature. It is a thing. As described above, the dimming curve of the comparative example and the dimming curve of the embodiment are substantially the same in the color temperature range of 2500 K or higher. On the other hand, at less than 2500K, the difference between the two is large. In the control of the comparative example, dimming was performed in accordance with the dimming curve of the incandescent lamp even in the color temperature range of 2500K or less, and the observer felt uncomfortable with the illumination light (the light felt yellowish) . On the other hand, in the control of the embodiment (Examples 1 and 2), it was found that a sense of incongruity was not felt, and a sudden change in the amount of light as in the third relationship led to rather good results. That is, in the lighting fixture of the present invention, it is possible to obtain appropriate illumination light with a little uncomfortable feeling even under a low color temperature such as 2500K or less.

  In particular, when using a downlight or a bracket that illuminates the wall, which is installed close to the wall surface, illumination light with a color temperature of 2500 K or less is highly likely to be noticeable in color, and thus the application of the present invention is effective.

  The dimming curves according to the first to fourth relationships are registered in the memory of the drive signal conversion unit 23. The control signal input unit 20 and the drive signal conversion unit 23 that constitute the light amount determination unit so that the color temperature and the light amount of the illumination light from the illumination light source 3 become the color temperature and the light amount according to the operation input of the operation unit 11. The light quantity of each of the first light emitting element 31 and the second light emitting element 32 is determined. According to the light amount determined by the light amount determination unit, the light emitting element driving unit (the first light emitting element driving unit 22A and the second light emitting element driving unit 22B) supplies power to the first light emitting element 31 and the second light emitting element 32, The light control curves shown in FIGS. 4B and 5 are obtained.

In the above embodiment, the second maximum amount L ₃ is the amount of the maximum value based on the second relation is adapted to set the obtained color temperature 2700 K. Here, the second relationship is preferably determined based on the dimming curve of the incandescent lamp, but there are various dimming curves of the incandescent lamp. Figure 6 shows the dimming curve of the six incandescent lamp, the second maximum value quantity L ₃ for each example is set under the following such color temperature.

Example 1: 2731K
Example 2: 2740K
Example 3: 2760K
Example 4: 2805K
Example 5: 3091K

As can be seen from the incandescent lamps example 5, the setting of the second maximum value quantity L ₃ color temperature 3100K is obtained, may be the second relation is such that established in the following color temperature region 3100K.

  In the above embodiment, the third relationship is established at 2500K. However, it is not strictly required to be 2500K, and it may be established at a color temperature in the vicinity of 2500K (a temperature slightly higher than 2500K is preferable) under the condition of not feeling uncomfortable. Furthermore, depending on the environment, it is possible to change the amount of light abruptly at a color temperature above 2500K (humans may not feel uncomfortable), so the third relationship does not exceed 2700K, for example, 2600K or less It may be established in the range of color temperature. Compared to 2500K, 2600K is closer to the black body locus, and it becomes easier to realize beautiful dimming by changing the amount of light at 2600K.

In the embodiment of Example 1 in FIGS. 4B and 5, as shown in FIG. 7A, the dimming curve changes substantially at an angle of 90 degrees in the third relationship. a color temperature at the maximum value quantity L _1, the difference between the color temperature at the minimum value light quantity L ₂ is substantially zero. However, as shown in the modified examples of FIGS. 7B and 7C, this difference does not have to be strictly zero, and it is sufficient that the change is abrupt as compared with the first and second relationships before and after. The example in FIG. 7B corresponds to Example 2 in FIG. 5, and the amount of light changes linearly with respect to the color temperature. In the example of FIG. 7C, the amount of light with respect to the color temperature is stepped. Has changed.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

DESCRIPTION OF SYMBOLS 1 Controller 2 Power supply unit 3 Illumination light source 31 1st light emitting element 32 2nd light emitting element 11 Operation part 20 Control signal input part (light quantity determination part)
22A 1st light emitting element drive part (light emitting element drive part)
22B 2nd light emitting element drive part (light emitting element drive part)
23 Drive signal conversion unit (light quantity determination unit)
34 Housing Unit with Connector 36 Connector 40 Lighting Equipment

Claims (8)

An illumination light source having a first light emitting element that emits light having a color temperature of 2700K or less and a second light emitting element that emits light having a color temperature of 5000K or more;
A light emitting element driving section for emitting the first and second light emitting elements individually and with an arbitrary amount of light;
Determination of light amount for determining the light amount of each of the first and second light emitting elements so that the color temperature and the light amount of the illumination light emitted from the illumination light source become the color temperature and the light amount according to an operation input from the outside. A lighting fixture comprising:
The light emitting element driving unit causes the first and second light emitting elements to emit light with the light amount determined by the light amount determining unit,
The light quantity determination unit is configured to perform an operation input based on a first relation that defines a relation between a color temperature and a light quantity when the light quantity of the first and second light emitting elements is between zero and a predetermined quantity of light. Determine the amount of light corresponding to the color temperature,
When the color temperature corresponding to the light amount larger than the predetermined amount of light is input by the operation input, the light amount determination unit, based on a second relationship that defines the relationship between the color temperature and the light amount, Determine the amount of light corresponding to the color temperature,
In the first relationship and the second relationship, the amount of light increases as the color temperature increases,
The first maximum light amount that is the maximum light amount based on the first relationship and the minimum light amount that is the minimum light amount based on the second relationship are different values, and the minimum light amount is Greater than the first maximum light quantity,
Between the first maximum light amount and the minimum light amount, a third relationship is established in which the amount of change in light amount with respect to the amount of change in color temperature is greater than in the first relationship and the second relationship. ,lighting equipment. The lighting fixture according to claim 1,
The lighting fixture in which the third relationship is established in a color temperature region of 2600K or less. The lighting fixture according to claim 2,
A lighting fixture in which the third relationship is established at a color temperature in the vicinity of 2500K. It is a lighting fixture of any one of Claim 1 to 3,
A lighting fixture in which a difference between a color temperature at the first maximum light amount and a color temperature at the minimum light amount is substantially zero. It is a lighting fixture of any one of Claim 1 to 4, Comprising:
The first maximum light amount is a value of 15% or less with respect to a second maximum light amount that is a maximum light amount based on the second relationship,
The lighting apparatus, wherein the minimum light amount is a value of 30% or more with respect to the second maximum light amount.
lighting equipment. It is a lighting fixture of Claim 5, Comprising:
The relationship between the light amount greater than the second maximum light amount and the color temperature is defined by a fourth relationship in accordance with a dimming curve of natural light. It is a lighting fixture of any one of Claim 1 to 6,
A luminaire wherein the second relationship is in accordance with a dimming curve of an incandescent lamp. It is a lighting fixture of Claim 7, Comprising:
The lighting fixture in which the second relationship is established in a color temperature region of 3100K or less.

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