JP6094806B2 - lighting equipment - Google Patents

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 a light amount of each of the first and second light emitting elements, the light amount determining unit being a first color temperature that is in a range of a color temperature of less than 2700K The total possible maximum light amount in which the light amount of the illumination light in either the range or the second color temperature range that exceeds 5000K is the sum of the maximum light amounts of the first and second light emitting elements. Less than 30% So that the amount, determines the first light emitting element and the second light amount of the light-emitting element, respectively.

  As one embodiment of the present invention, for example, the light amount determination unit determines the light amount of illumination light in either the first color temperature range or the second color temperature range to be zero.

  As an embodiment of the present invention, for example, the light amount determination unit is configured such that the amount of illumination light in both the first color temperature range and the second color temperature range is 30% or less of the possible maximum light amount. The light amounts of the first light emitting element and the second light emitting element are determined so that

  As one embodiment of the present invention, for example, the light amount determination unit determines that the amount of illumination light in both the first color temperature range and the second color temperature range is zero.

  As an embodiment of the present invention, for example, the light amount determination unit determines a color temperature range of illumination light having a duv exceeding +0.02 as the first color temperature range or the second color temperature range.

  As an embodiment of the present invention, for example, two chromaticity points on the chromaticity diagram of the first light emitting element and the second light emitting element are located above the black body locus on the chromaticity diagram. A straight line connecting the two chromaticity points intersects the black body locus.

  According to the lighting apparatus according to the present invention, it is possible to reduce the amount of irradiation light at the constant temperature side color temperature and the term temperature side color temperature that deviate from the black body locus, and to obtain the irradiation light with less sense of incongruity. It becomes.

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 Diagram showing part of xy chromaticity diagram limited to the range of x = 0.25-0.55 and y = 0.25-0.45 Dimming curve showing the relationship between color temperature and light quantity in the embodiment Dimming curve showing the relationship between color temperature and light intensity in the modified example

  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 in which they are arranged.

  The first light emitting element 31 and the second light emitting element 32 have different color temperatures, and in the present embodiment, the first light emitting element 31 emits light having a color temperature of 2000K, 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 = 0.25 to 0.55 and y = 0.25 to 0.45. 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 (yellowish system) of the correlated color temperature of 2000K, 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. In addition, since a higher color temperature feels brighter, white fluorescent lamps of 5000K to 6500K are popular in recent years. Accordingly, illumination light over a color temperature range of 2000K to 8000K is required for a downlight or the like that substitutes for an incandescent lamp, and the first light emitting element 31 (2000K in the embodiment) having a color temperature lower than 2700K, 5000K. In addition, it is required to use the second light emitting element 32 (8000K in the embodiment) having a higher color temperature than that. Further, it is preferable that the color temperature difference between the first light emitting element 31 and the second light emitting element 32 is large, and the reason will be described later.

  However, especially in the color temperature range of 2700 K or less and the color temperature range of 5000 K or more, the illumination light obtained by mixing the light of the first light emitting element 31 and the second light emitting element 32 has a deviation from the black body locus. growing. 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.

That is, in the color temperature range of 2700K or less and the color temperature range of 5000K or more, 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. And undesired light. As a result of the study, the inventor has come up with the idea of reducing or reducing the amount of illumination light in these ranges to zero. By controlling the amount of light in this way, it becomes difficult for humans to feel uncomfortable with illumination light. Specifically, as shown in FIG. 3, the range of the amount of illumination light P0 (x ₀ , y ₀ ) obtained is limited from the viewpoint of color temperature. More specifically, in the first color temperature range on the low temperature side that is a color temperature range of 2300 K or less, the possible total maximum that is the total value of the maximum light amounts of the first and second light emitting elements 31 and 32. The amount of illumination light was set so that the amount of light was 30% or less of the amount of light. In addition, in the second color temperature range on the high temperature side that is a color temperature range of 6500 K or more, the light amounts of both the first and second light emitting elements 31 and 32 are set to zero, and the light amount of illumination light is set to zero. did.

  As described above, the illumination light obtained by the first and second light emitting elements 31 and 32 is reduced in its light amount over a certain range of color temperatures on the high temperature side and the low temperature side from the viewpoint of the color temperature. Alternatively, the light deviating from the black body locus can be reduced by setting it to zero. As a result, it is possible to obtain illumination light in which humans do not feel uncomfortable.

FIG. 4 shows a dimming curve of illumination light showing the relationship between the color temperature and the amount of light in the above embodiment. In the present embodiment, the light amount determination unit (control signal input unit 20, drive signal conversion unit 23) determines the light amount with respect to the color temperature of the illumination light in accordance with the dimming curve (DEBG) of the thickest line. The dimming curve (BG) of 2700 or less and K or less follows the dimming curve of a general incandescent lamp. Among these, in the range of the color temperature of less than 2300K, the amount of illumination light is possible total 30% of the maximum light intensity. On the other hand, in the range of color temperature exceeding 6500K, the amount of illumination light is zero (EDHI). Further, the above-described possible total maximum light amount is obtained at about 4000 K, and A ₁ J = 100%.

The dotted line indicates the maximum total output possible when the light amounts of the first light emitting element 31 and the second light emitting element 32 are maximized (at a specific position on the x-axis) under the condition for obtaining a specific color temperature. The amount of light (the amount of illumination light). Here, the line segment FG corresponds to the maximum light amount when the first light emitting element 31 emits light alone, and the line segment HI corresponds to the maximum light amount when the second light emitting element 32 emits light alone. The line segment A ₁ J corresponding to the maximum possible light quantity is equal to the sum of the line segment FG and the line segment HI (A ₁ J = FG + HI). Therefore, the portion of the triangle A ₁ BE in 2700K to 6500K corresponds to the energy of the light amount that can be output originally but is not output as a result of being suppressed by the light amount determination unit. This energy is so-called loss energy that is discarded by the action of the light quantity determining unit (increase in resistance component, etc.).

  FIG. 5 shows a dimming curve of illumination light showing the relationship between the color temperature and the amount of light in the modified example. In this example, the light amount is set to zero at a color temperature of less than 2700 K, which is the first color temperature range. Further, the second temperature range is set to a color temperature range exceeding 5000K, and the light quantity is also zero in this range. This is because illumination light having a color temperature in the range of 2700K to 5000K is generally used in practice.

  This light control curve can be realized by a combination (combination A) of the first light emitting element 31 having a color temperature of 2700K and the second light emitting element 32 having a color temperature of 5000K. This light control curve can also be realized by a combination (combination B) of the first light emitting element 31 having a color temperature of 2000K and the second light emitting element 32 having a color temperature of 8000K, as in the case of FIG. is there.

As described above, any light emitting element having any color temperature can be used as long as the light emitting element has a lower temperature side and a higher temperature side than the color temperature range (2700K to 5000K) to be realized. However, as shown in the figure, for the two combinations, the maximum total light amount (light amount of illumination light) that can be output when the light amounts of the first light emitting element 31 and the second light emitting element 32 are maximized is the solid line (EA ₁ B) and the dotted line (HEA ₂ BF) are different. This is because the difference in color temperature of the light emitting elements is different in each combination. In combination A, the color temperature difference is 5000K-2700K = 2300K, and in combination B, the color temperature difference is 8000K-2000K = 6000K.

  Basically, it is preferable that the color temperature difference is large. In this example, the combination B is more preferable than the combination A. Preferred reasons are (1) and (2) below.

(1) The combination having a larger color temperature difference has a smaller loss energy and can reduce power consumption. In combination B, the loss energy corresponds to a portion of triangle A ₂ BE, whereas in combination A, the loss energy corresponds to a portion of triangle A ₁ BE. Therefore, the combination B has less energy loss than the combination A by the amount of the region (A ₁ BA ₂ + A ₁ EA ₂ ).

(2) The combination having a larger color temperature difference can reduce the maximum light amount (power) required for each light emitting element. In the combination B, the maximum light amount required for the first light emitting element 31 is FG, and the maximum light amount required for the second light emitting element 32 is HI. On the other hand, in the combination A, the maximum light amount required for the first light emitting element 31 is BC, and the maximum light amount required for the second light emitting element 32 is ED. It is clear that BC (combination A)> FG (combination B), ED (combination A)> HI (combination B). Therefore, the combination B can use a light emitting element with lower power than the combination A, and can reduce cost and size.

  As shown in the embodiment and the modification, the light amount of illumination light in either the first color temperature range or the second color temperature range may be set to be zero (FIG. 4), or both ranges You may set so that the light quantity of the illumination light in may become zero (FIG. 5). Further, the amount of illumination light in both ranges may be greater than zero and less than or equal to 30% of the total possible maximum amount of light. Also.

  Here, although the method for determining the first color temperature range or the second color temperature range is not strictly limited, the color of the illumination light in which the duv representing the degree of deviation from the black body locus exceeds +0.02. The temperature range can be determined as the first color temperature range or the second color temperature range. Note that when the color temperature of the first light emitting element 31 and the second light emitting element 32 changes, the relative position of the straight line with respect to the black body locus in FIG. 3 changes, so the color of the illumination light whose duv exceeds +0.02 The temperature will also change.

  The dimming curve as described above is registered in the memory of the drive signal converter 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.

  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 (5)

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 amount determination unit is configured to determine a light amount of illumination light in either the first color temperature range that is a color temperature range less than 2700K or the second color temperature range that is a color temperature range that exceeds 5000K. And determining the light quantity of each of the first light emitting element and the second light emitting element so that the light quantity is 30% or less of the possible maximum light quantity, which is the sum of the maximum light quantities of each of the second light emitting elements ,
The light quantity determination unit is a lighting fixture that determines the light quantity of illumination light in either the first color temperature range or the second color temperature range to be zero . 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 amount determination unit is configured to determine a light amount of illumination light in either the first color temperature range that is a color temperature range less than 2700K or the second color temperature range that is a color temperature range that exceeds 5000K. And determining the light quantity of each of the first light emitting element and the second light emitting element so that the light quantity is 30% or less of the possible maximum light quantity, which is the sum of the maximum light quantities of each of the second light emitting elements,
The light amount determination unit is configured to perform the first light emission so that the amount of illumination light in both the first color temperature range and the second color temperature range is equal to or less than 30% of the total possible maximum light amount. A lighting fixture that determines the light quantity of each of the element and the second light emitting element. The lighting fixture according to claim 2 ,
The light amount determination unit is a lighting fixture that determines the light amount of illumination light in both the first color temperature range and the second color temperature range to be zero. The lighting apparatus according to claim 1 or 2 ,
The light amount determination unit is a lighting fixture that determines a color temperature range of illumination light having a duv exceeding +0.02 as the first color temperature range or the second color temperature range. The lighting apparatus according to claim 1 or 2 ,
Two chromaticity points on the chromaticity diagram of the first light-emitting element and the second light-emitting element are located above the black body locus on the chromaticity diagram and connect the two chromaticity points. A lighting fixture in which a straight line intersects the black body locus.

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