JP2012113958A - Light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize natural light colors in a light-emitting device using solid light-emitting elements (LEDs), whose chromaticity conforms to a black body radiation track at each color temperature, even though color temperatures are variable.SOLUTION: A light-emitting device 1 comprises at least three LEDs 2 with different levels of chromaticity including one which emits light of chromaticity along a black body radiation track, a chromaticity setting unit 3 which sets a prescribed level of chromaticity between the lowest and the highest of color temperatures of the LEDs 2, and a control unit 4 which adjusts dimming of the optical output of the LEDs 2 to the level of chromaticity set by the chromaticity setting unit 3. The control unit 4, if there is any LED 2 whose chromaticity matches the set level of chromaticity, causes the LED 2 to light up, and, if there is no LED 2 whose chromaticity matches the set level of chromaticity, causes at least two LEDs 2 to light up, whose color temperatures respectively are close to the high and the low sides of color temperatures from the set level of chromaticity. Thus, it is possible to realize natural light colors whose chromaticity conforms to a black body radiation track at each color temperature, even though color temperatures are variable.

Description

  The present invention relates to a light emitting device using a plurality of solid state light emitting elements as a light source.

  Light emitting diodes (hereinafter referred to as LEDs) are capable of emitting light with low power and high luminance, and are used as light sources for various electric devices such as displays and lighting equipment. In recent years, blue LEDs have been put into practical use in addition to red LEDs and green LEDs, and various light colors can be emitted by combining these RGB three-color LEDs. Moreover, the color temperature of the emitted light can be arbitrarily set by combining phosphors that convert the wavelength of the emitted light of the LED.

  As this type, it has a plurality of LED groups having two or three different color temperatures, adjusts the ratio of each current supplied to these LED groups, and irradiates light of a predetermined chromaticity A light-emitting device that can be used is known (for example, see Patent Document 1).

  Also, LED light sources having different color temperatures in the vicinity of the black body radiation locus in the chromaticity diagram are provided, and the color temperature of the mixed color light can be continuously changed by additive color mixing of light emitted from each light source. A light emitting device is known (see, for example, Patent Document 2). This Patent Document 2 describes a configuration in which, in addition to two LEDs having different color temperatures on a black body radiation locus, LEDs having a chromaticity with a deviation duv in the positive direction with respect to the black body radiation locus. ing.

  Furthermore, a light-emitting device is known in which the deviation duv of the emission color of each LED falls within the range of −0.02 ≦ duv ≦ 0.02 (see, for example, Patent Document 3). This Patent Document 3 describes a configuration using two types of LEDs having a deviation duv in the range of +0.02 with respect to a black body radiation locus and different color temperatures.

JP 2008-262823 A JP 2009-123429 A JP 2009-238729 A

  However, when two colors of light with different color temperatures, such as daylight white and light bulb color, are mixed, the variable range of chromaticity greatly deviates from the black body radiation locus, and it is difficult to generate light of a natural hue. For example, as shown in FIG. 11, in a light emitting device using an LED (a) having a color temperature of 5000K and an LED (b) having a color temperature of 2000K, the output ratio of these two colors is controlled. The chromaticity of the mixed color light changes within a range where the chromaticities of 5000K and 2000K are connected by a straight line. Generally, incandescent lamps and sunlight are said to change on the chromaticity curve of this blackbody radiation locus, and the chromaticity near this blackbody radiation locus may be the most natural and uncomfortable light. Are known. However, the above-mentioned mixed color light has a chromaticity change range greatly deviating from the black body radiation locus, and may become a pinkish light color with a sense of incongruity.

  Also, multiple LEDs with different color temperatures are semiconductors with different characteristics, and the emission chromaticity varies from LED to LED depending on the output, so the color temperature is adjusted for each device that incorporates them, and the color temperature is naturally set. It is difficult to make it variable with various emission colors. However, Patent Documents 1 to 3 do not specifically describe how to control each LED in order to emit a natural emission color along the black body radiation locus. Therefore, depending on the color temperature, the chromaticity of the irradiation light may deviate from the black body radiation locus, and the natural light color may not be obtained.

  An object of the present invention is to solve the above-described problems, and to provide a light emitting device capable of realizing a natural light color in which the chromaticity at each color temperature is along a black body radiation locus while the color temperature is variable. To do.

  In order to solve the above problems, a light-emitting device according to the present invention includes at least three solid-state light-emitting elements that emit light having different chromaticities, including a solid-state light-emitting element that emits light having a chromaticity on a black body radiation locus, A chromaticity setting unit that sets a predetermined chromaticity between the lowest color temperature and the highest color temperature among the color temperatures of the solid state light emitting device, and the light output of the solid state light emitting device by the chromaticity setting unit A control unit that performs dimming control to a set chromaticity, and the control unit includes a solid-state light-emitting element that emits light having a chromaticity that matches the set chromaticity among the solid-state light-emitting elements. If there is no solid light-emitting element that emits light of the solid light-emitting element and emits light having a chromaticity that matches the set chromaticity, the color temperature is higher and lower when viewed from the set chromaticity. At least two solid colors with color temperatures close to each side And characterized in that the light emitting element.

  In the light-emitting device, it is preferable that the chromaticity of the mixed light of the solid-state light-emitting elements having adjacent color temperatures among the solid-state light-emitting elements is set so that the deviation duv from the black body radiation locus is in a negative range. .

  In the light emitting device, the chromaticity of the mixed color light of the solid state light emitting elements having adjacent color temperatures among the solid state light emitting elements is set such that the deviation duv from the black body radiation locus is in the range of −0.02 to 0. Preferably it is.

  In the light emitting device, the solid state light emitting element includes a first solid state light emitting element having a color temperature of 1900 to 3000K, a second solid state light emitting element having a color temperature of 5000K or more, and the first and second solid state elements. And a third solid state light emitting device having a color temperature intermediate that of the light emitting device.

  In the light-emitting device, the solid-state light-emitting element preferably emits light obtained by wavelength-converting light from the light-emitting portion using a phosphor or a filter.

  According to the present invention, it is possible to realize a natural light color in which the chromaticity at each color temperature is along the black body radiation locus while the color temperature is variable.

The block diagram of the light-emitting device which concerns on one Embodiment of this invention. (A) is a perspective view of a lighting fixture incorporating the light emitting device, (b) is an exploded perspective view of the lighting fixture, and (c) is a top view of a solid light emitting element and a substrate used in the light emitting device. The chromaticity diagram which shows the chromaticity of the solid light emitting element used for the light-emitting device. The sectional side view of the solid light emitting element. The figure which shows the light control pattern of three solid light emitting elements in the light-emitting device. The figure which shows the change of the light color and light output of the light-emitting device. The figure which shows the change of the light color and light output of the light-emitting device. The chromaticity diagram which shows the chromaticity of the solid light emitting element used for the light-emitting device which concerns on the modification of the said embodiment. The chromaticity diagram which shows the chromaticity of the solid light emitting element used for the light-emitting device which concerns on another modification. Furthermore, the chromaticity diagram which shows the chromaticity of the solid light emitting element used for the light-emitting device which concerns on another modification. The chromaticity diagram which shows the chromaticity of the solid light emitting element used for the conventional light-emitting device.

  A light emitting device according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the light-emitting device 1 of the present embodiment includes a light-emitting diode (hereinafter, LED) 2 as a solid-state light-emitting element that is a light source, a chromaticity setting unit 3 that sets a predetermined chromaticity, and an LED 2. And a control unit 4 that adjusts the light output to the chromaticity set by the chromaticity setting unit 3. In the present embodiment, the LED 2 has a configuration in which at least three, in this case, three types of LEDs 2a, 2b, and 2c, each configured to emit light having different chromaticities, are used. In addition, these LEDs 2a, 2b, and 2c have a higher color temperature of emitted light in this order. A plurality of LEDs 2a, 2b, and 2c are mounted on the substrate 5 as a package. In the example shown in the figure, six LEDs 2a, 2b and four LEDs 2c are used. However, the number of LEDs 2a, 2b, 2c is not limited to this example, and four or more types of LEDs 2 are used. May be. In general, as the light output of the light emitting device 1 increases, the color temperature also increases accordingly. Therefore, the number of LEDs 2a having a high color temperature is preferably used more than the number of LEDs having a low color temperature. A wiring circuit 51 (wiring circuits 51a, 51b, 51c in the illustrated example) is formed on the substrate 5 so that the same kind of LEDs 2 are connected in series as one package.

  The chromaticity setting unit 3 includes a volume controller 31 for setting the color temperature of the light emitted from the LEDs 2a, 2b, and 2c, that is, the color temperature of the light emitted from the light emitting device 1, to a predetermined value. The volume controller 31 switches the light emitting device 1 from the off state to the on state by a rotation operation of the knob by the user, and changes the light output of the light emitting device 1 according to the rotation range. Further, the volume controller 31 emits light of a low color temperature while the light emitting device 1 is in the on state and the light output is small, and further increases the light output by further rotating the knob, and gradually decreases. A light control operation for irradiating light with a color temperature higher than the color temperature is enabled.

  When a predetermined color temperature is input by the volume controller 31, the chromaticity setting unit 3 causes the chromaticity on the black body radiation locus at the input color temperature, that is, the equal color temperature on the chromaticity diagram at this color temperature. The intersection coordinates of the line and the black body radiation locus are set to the set chromaticity (hereinafter, set chromaticity). Further, the chromaticity setting unit 3 outputs a duty signal including control information on the set chromaticity to the control unit 4.

  The control unit 4 is incorporated in a power supply unit (not shown) that turns on the light emitting device 1, and has a plurality of output terminals (in the example shown, outputs a, b, c) according to the package type of the LEDs 2 a, 2 b, 2 c. ). The control unit 4 receives power from a commercial power source (not shown) and converts the power into a predetermined direct current, and sets the LEDs 2a, 2b, and 2c to correspond to the duty signal from the chromaticity setting unit 3. It has a rectification transformer circuit (not shown) for controlling an applied voltage for dimming control. Each output (terminal) a, b, c is connected to wiring circuits 51a, 51b, 51c by wirings 41a, 41b, 41c, respectively.

  As shown in FIG. 2A, the light emitting device 1 is preferably incorporated in an embedded lighting fixture 10 embedded in a ceiling, a wall surface or the like. The lighting fixture 10 includes a main body 11 that holds the light emitting device 1 and accommodates a power supply unit (not shown) that lights the light emitting device 1. In addition, a frame body portion 12 that is fitted in an opening formed in a ceiling or the like and holds a light source or the like, a terminal block 13 to which a power supply line for receiving power supply from a commercial power source is connected, and the frame body portion 12 And an attachment spring 14 for fixing to a ceiling or the like.

  2B, the lighting fixture 10 is provided between the substrate 5 described above, the heat sink member 6 for dissipating the heat of the LED 2, and the substrate 5 and the LE heat sink member 6. And a member 7. Moreover, the lighting fixture 10 is provided with the protective cover 8 which protects LED2. A screw holder (not shown) is provided on the back side of the protective cover 8, and the protective cover 8 and the heat sink member 6 are fixed by screws (not shown) inserted from the inside of the heat sink member 6 (main body 11). The

  As shown in FIG. 2 (c), the LED 2 has an LED 2c having a low color temperature disposed in a substantially central region of the substrate 5, and the LEDs 2b and 2a having a higher color temperature than the LED 2c are of the same type around the LED 2c. Are arranged alternately so that they are not next to each other. In addition, arrangement | positioning of LED2a, 2b, 2c is not restricted to the structure of an example of a figure.

The substrate 5 is a substrate for a general-purpose light emitting module. For example, a metal oxide (including ceramics) having electrical insulating properties such as aluminum oxide (Al ₂ O ₃ ) or aluminum nitride (AlN), a metal nitride, Or it is comprised from materials, such as a metal, resin, and glass fiber. The wiring circuit 51 (see FIG. 1) formed on the substrate 5 is covered with an insulating material, and the portions connected to the positive and negative electrodes of the LEDs 2a, 2b, and 2c and the portions connected to the wirings 41a, 41b, and 41c, respectively. It is exposed as an electrode terminal (not shown).

  In the present embodiment, as shown in FIG. 3, a plurality of LEDs 2a, 2b, and 2c that emit light having different chromaticities on the black body radiation locus are used. Of the LEDs 2a, 2b, and 2c, at least one chromaticity may be on the black body radiation locus. In the figure, the chromaticity points of these LEDs 2a, 2b, 2c are displayed as 2a, 2b, 2c. When the LEDs 2a and 2b or the LEDs 2b and 2c are caused to emit light, the chromaticity of the mixed color light changes along the line segment 2a-2b or the line segment 2b-2c in the figure according to the light emission ratio. The change range of the chromaticity of the mixed color light indicated by the line segment is in a range where the deviation duv with respect to the blackbody radiation locus is negative. In the present embodiment, the set color temperatures of the LEDs 2a, 2b, and 2c are set to 5000K, 3000K, and 2000K, respectively. That is, the light emitting device 1 can change the color temperature in the range of 2000 to 5000K.

  As shown in FIG. 4, the LED 2 includes a base material 20 having a rectangular cross section, a light emitting unit (LED chip) 21 mounted on the base material 20, a frame body 22 having a recess surrounding the LED chip 21, and a frame And a filler 23 filled in the body 22. The filler 23 is made of silicon or the like, and contains a phosphor 24 that converts the wavelength of light emitted from the LED chip 21. A cathode electrode 25 is provided on one side surface of the substrate 20, and an anode electrode 26 is provided on the other side surface, which are connected to external connection electrodes 27 and 28 formed at both ends of the lower surface of the substrate 20. Further, the cathode electrode 25 and the anode electrode 26 are connected to respective electrode terminals (not shown) of the LED chip 21 by wires 29. The inner peripheral surface of the frame 22 is formed as a conical surface that opens in the light-derived direction, and the surface of the conical surface has a light reflecting function. The LED chip 21 is preferably a blue LED element that emits blue light or a green LED element that emits green light. By adjusting the type or content of the phosphor 24, light having a desired chromaticity is used. LED2 that emits light is obtained. A filter (not shown) that converts the wavelength of the light emitted from the LED 2 by selectively transmitting light having a predetermined wavelength in addition to or instead of the phosphor 24 may be used. This filter may be provided on the protective cover 8 of the luminaire 10 (see FIG. 2B). Further, the LED 2 is provided with a lens member (not shown) for appropriately controlling the light distribution of the emitted light, and the phosphor 24 or the filter described above is disposed on the lens member or between the LED 2 and the lens member. It may be incorporated in. In addition, LED conforming to the LED chromaticity rule (ANSI standard) stipulated in the United States, which is a substantial global standard, has a chromaticity variation within a predetermined range from the black body radiation locus. Therefore, these general-purpose LEDs may be used.

  Here, in addition to FIG.1 and FIG.3 mentioned above, the light control pattern of the light-emitting device 1 is demonstrated with reference to FIG. When there is an LED 2 that emits light having a chromaticity that matches the above-described set chromaticity among the LEDs 2a, 2b, and 2c, the control unit 4 causes the LED 2 to emit light. Further, when there is no LED 2 that emits light having a chromaticity that matches the set chromaticity, at least two LEDs 2 having color temperatures close to the higher and lower color temperatures as viewed from the set chromaticity are caused to emit light. That is, as shown in FIG. 5, when the set chromaticity is a chromaticity corresponding to a color temperature of 5000K, the package of the LED 2a is caused to emit light. Similarly, when the set chromaticity is a chromaticity corresponding to a color temperature of 3000K and 2000K, the LED2b and LED2c packages are caused to emit light, respectively. Further, when the set chromaticity is a chromaticity corresponding to the range of the color temperature of 5000 to 3000K, two types of LEDs 2a having color temperatures close to the higher and lower color temperatures as viewed from the set chromaticity, respectively. The 2b package is illuminated. Similarly, when the set chromaticity is a chromaticity corresponding to a color temperature in the range of 3000 to 2000K, the two types of LEDs 2b and 2c are caused to emit light. Here, “match” is not limited to the case where the respective chromaticities are completely matched, and includes, for example, the case where the deviation duv has a difference of about ± 0.01.

  More specific dimming control patterns of the light emitting device 1 will be described with reference to FIGS. 6 and 7 in addition to FIGS. 1 and 3 described above. FIG. 6 is a plot of the light output of each LED 2a, 2b, 2c corresponding to the light color of the light emitting device 1, and FIG. 7 is a sum of these light outputs. When the user operates the volume controller 31, according to the operation, the control unit 4 switches the light emitting device 1 from the off state to the on state, and gradually increases the light output. At this time, the control unit 4 first causes the LED 2c having the lowest color temperature among the LEDs 2a, 2b, and 2c to emit light (S1 in FIGS. 6 and 7). Since the light emitted from the LED 2c has a chromaticity on the black body radiation locus, a natural light color is realized.

  Subsequently, when the volume controller 31 is operated, the control unit 4 causes the LED 2b having a color temperature of 3000K to emit light in addition to the LED 2c in order to intermittently increase and increase the light output and the color temperature (see FIG. 6 and S2 in FIG. At this time, the chromaticity of the mixed color light of the LEDs 2b and 2c exists on the line segment 2b-2c shown in FIG. 3, and the line segment is close to the black body radiation locus at any point. Light color is realized. When the operation value in the volume controller 31 is 3000K, the control unit 4 turns off the LED 2c and causes only the LED 2b to emit light (S3 in FIGS. 6 and 7). At this time, the light output of the light emitting device 1 is 100%. Since the light emitted from the LED 2b has a chromaticity on the black body radiation locus, a natural light color is realized.

  Further, when the volume controller 31 is operated, the control unit 4 gradually decreases the light output of the LED 2b in order to increase the color temperature intermittently, and gradually increases the light output of the LED 2a having a color temperature of 5000K. They are caused to emit light (S4 in FIGS. 6 and 7). At this time, the chromaticity of the mixed color light of the LEDs 2a and 2b exists on the line segment 2a-2b shown in FIG. 3, and the line segment is close to the black body radiation locus at any point. Light color is realized. When the operation value in the volume controller 31 is 5000K, the control unit 4 turns off the LED 2b and causes the LED 2a to emit light (S5 in FIGS. 6 and 7). The light emitted from the LED 2a also has a natural light color because the chromaticity is on the black body radiation locus.

  The LEDs 2a, 2b, and 2c have the chromaticity of each emitted light on the black body radiation locus, and therefore the chromaticity of the mixed color light of the LEDs 2 that have adjacent color temperatures (in the present embodiment, the LEDs 2a and 2b or the LEDs 2b and 2c). Are set so that the deviations duv from the blackbody radiation locus are in the negative range, respectively. In this way, when the set chromaticity matches the specific chromaticity of the emitted light from the LEDs 2a, 2b, and 2c, the LED 2 having the chromaticity is selectively caused to emit light, so that a particularly natural light color is realized. Even if the set chromaticity does not match the intrinsic chromaticity of the emitted light from the LEDs 2a, 2b, and 2c, the color of the mixed color light can be adjusted by appropriately dimming the adjacent LEDs 2 with their color temperatures. A natural light color with a degree close to the blackbody radiation locus is realized. Moreover, it is preferable that the chromaticity of these mixed color lights is set so that the deviation duv from the blackbody radiation locus is in the range of -0.02 to 0. In this way, a more natural light color is realized.

  Since the light emitting device 1 is configured as described above, it is possible to realize a natural light color in which the chromaticity at each color temperature is along the black body radiation locus while the color temperature is variable. Further, when the light output of the light emitting device 1 is small, as shown in FIG. 2C, the LEDs 2c having a low color temperature arranged so as to gather in the substantially central region of the substrate 5 are mainly lit. Light unevenness on the surface is less likely to occur. Further, when the light output of the light emitting device 1 is large, the LEDs 2b, 2a having a higher color temperature than the LED 2c are lit brightly, so that the non-lighted portion where the LED 2c is arranged is canceled out. Light unevenness on the surface is less likely to occur.

  Here, a modification of the above-described embodiment will be described with reference to FIG. In the above-described embodiment, the configuration using the LEDs 2a, 2b, and 2c having the color temperatures of 5000K, 3000K, and 2000K has been described, but the LED 2 includes the first to third colors that have color temperatures in the following three ranges. LED may be used. That is, the first LED 2c ′ has a color temperature in a range (Rc) of 1900 to 3000K, the second LED 2a ′ is in a range (Ra) of 5000K or more, and the third LED 2b ′ is an LED 2c ′, The color temperature is in the middle range (Rb) of 2a ′. In the figure, the chromaticity points of LEDs 2a ', 2b', 2c 'are indicated by 2a', 2b ', 2c', respectively. The color temperatures are assumed to be 7000K, 3500K, and 2700K, respectively, and any color temperature exists in the above-described ranges Ra, Rb, and Rc.

  This modification is set so that the color temperature of each LED is higher than in the above-described embodiment. Since the curve of the black body radiation locus is gentle at a color temperature of 3500 K or higher, the line segment 2a'-2b 'connecting the chromaticity points 2a' and 2b 'is close to the black body radiation locus. Further, since the color temperature of the LED 2c ′ is higher than that of the above-described embodiment, the line segment 2a′-2c ′ connecting the chromaticity points 2a ′ and 2c ′ is also the color of the LED 2a and 2c of the above-described embodiment. Compared with the line segment connecting the degrees (line segment 2a-2c in FIG. 3), it is relatively close to the black body radiation locus. Therefore, even when the LEDs 2a, 2b, and 2c that are adjacent to each other, as well as the two LEDs 2a and 2b or LEDs 2b and 2c that are adjacent to each other, are lit simultaneously, the chromaticity of the mixed-color light exists in the vicinity of the black body radiation locus. Therefore, the light output can be increased and a natural light color can be realized. This modification is effective in increasing the light output of white light having a color temperature of 4000 to 5000 K that is frequently used as illumination.

  As another modification, the deviation duv of the emitted light can be shifted in the positive direction on the same color temperature line by covering the LED 2b (color temperature 3000K) of the above-described embodiment with a phosphor cap. . In addition, LED2b which covered the fluorescent substance cap is made into LED2b ", and the chromaticity point is shown by 2b" of FIG. In this case, a natural light color along the black body radiation locus can be realized by controlling the three LEDs 2 a, 2 b ″, and 2 c with predetermined dimming control.

  As yet another modification, one LED 2a out of the plurality of LEDs 2 emits light having a chromaticity on the black body radiation locus, and the other LEDs 2d and 2e have chromaticities away from the black body radiation locus. Light may be emitted. The chromaticity points of the LEDs 2a, 2d, and 2e are indicated by 2a, 2d, and 2e in FIG. The LED 2a that emits light of chromaticity on the black body radiation locus preferably has the highest color temperature among the plurality of LEDs 2. That is, the higher the color temperature, the higher the output power, the greater the influence on the chromaticity of the mixed color light. In addition, in this modification, it is preferable that the color temperature of LED2a is about 5000-10000K. The LED 2d is a general-purpose white LED covered with a phosphor cap to emit green light, and its chromaticity coordinates are (x, y: 0.39, 0.54). The LED 2e emits red light with a phosphor cap, and its chromaticity coordinates are (x, y: 0.59, 0.36). Since these can use a general-purpose white LED package, the advantages in cost and procurement are great.

  In addition, this invention is not restricted to the said embodiment, A various deformation | transformation is possible. For example, the three LEDs 2a, 2b, and 2c shown in FIG. 3 are set as one package, and the three LEDs 2a ′, 2b ′, and 2c ′ shown in FIG. 8 are set as one package. Then, by combining these and performing dimming control, it is possible to realize a natural light color in which the variable range of the color temperature is wide and the chromaticity is close to the black body radiation locus at each color temperature.

DESCRIPTION OF SYMBOLS 1 Light-emitting device 2 LED (solid-state light emitting element)
3 Chromaticity setting unit 4 Control unit 24 Phosphor

Claims (5)

At least three solid-state light emitting elements that emit light of different chromaticities, including solid-state light emitting elements that emit light of chromaticity on a black body radiation locus;
A chromaticity setting unit that sets a predetermined chromaticity between the lowest color temperature and the highest color temperature among the color temperatures of the solid-state light emitting element;
A control unit that performs dimming control on the light output of the solid state light emitting device to the chromaticity set by the chromaticity setting unit,
When there is a solid light-emitting element that emits light having a chromaticity that matches the set chromaticity among the solid-state light-emitting elements, the control unit causes the solid-state light-emitting element to emit light, and the set chromaticity and If there is no solid light-emitting element that emits light of the same chromaticity, at least two solid-state light-emitting elements having color temperatures close to the higher and lower color temperatures as seen from the set chromaticity are caused to emit light. A light emitting device characterized by that.   2. The chromaticity of mixed color light of solid light emitting elements having adjacent color temperatures among the solid light emitting elements is set such that a deviation duv from a black body radiation locus is in a negative range. The light emitting device according to 1.   The chromaticity of the mixed color light of the solid state light emitting elements of which the color temperature is adjacent is set so that the deviation duv from the black body radiation locus is in the range of −0.02 to 0. The light emitting device according to claim 2.   The solid state light emitting device includes a first solid state light emitting device having a color temperature of 1900 to 3000K, a second solid state light emitting device having a color temperature of 5000K or more, and an intermediate between the first and second solid state light emitting devices. The light-emitting device according to claim 1, further comprising: a third solid-state light-emitting element having a color temperature.   The light emission according to any one of claims 1 to 4, wherein the solid-state light emitting element emits light obtained by wavelength-converting light from a light emitting unit using a phosphor or a filter. apparatus.

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