Light source device, illumination device, and illumination system

Abstract

To provide a light source device capable of improving the reproducibility of white and surrounding luminous colors.SOLUTION: The light source device includes: a first LED that emits light of a first luminous color; a second LED that emits a second luminous color; a third LED that emits a third luminous color; and a fourth LED that emits a fourth luminous color. On the xy chromaticity diagram, the light source device has a luminous color area S1 of a quadrilateral with four sides of a first line segment L1, a second line segment L2, a third line segment L3, and a fourth line segment L4. The first line segment L1 is a line segment connecting two chromaticity coordinates C11 and C12. The second line segment L2 is a line segment connecting two chromaticity coordinates C12 and C13. The third line segment L3 is a line segment connecting two chromaticity coordinates C13 and C14. The fourth line segment L4 is a line segment connecting two chromaticity coordinates C14 and C11. The luminous color area S1 includes white and white-based luminous colors as specified in JIS Z8110, and a light chromatic color outside the white light color.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a light source device, a lighting device, and a lighting system, and more particularly, to a light source device having a variable emission color, a lighting device including the light source device, and a lighting system including the lighting device.

Background Art

[0002] As a conventional example, a lighting light source (light source device) described in Patent Document 1 is exemplified. The lighting light source described in Patent Document 1 (hereinafter referred to as the conventional example) is configured by mounting four types (four colors) of light emitting diodes on the same circumference on the surface of a substrate so as to be separated from each other by a central angle of 90°. These four types of light emitting diodes are a red light emitting diode, a green light emitting diode, and two blue light emitting diodes having different peak emission wavelengths.

[0003] The conventional example includes two blue light emitting diodes having different peak emission wavelengths, thereby improving the luminous flux and the average color rendering index.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in fields such as stage lighting, improvement in the reproducibility of white and light emission colors in its vicinity on the xy chromaticity diagram is desired.

[0006] An object of the present disclosure is to provide a light source device, a lighting device, and a lighting system capable of improving the reproducibility of white and light emission colors in its vicinity.

Means for Solving the Problems

[0007] A light source device according to one aspect of the present disclosure includes a first light emitting element that emits light of a first emission color, a second light emitting element that emits light of a second emission color, a third light emitting element that emits light of a third emission color, and a fourth light emitting element that emits light of a fourth emission color. The chromaticity coordinates of the first emission color exist in the red or yellow - red region in the xy chromaticity diagram of the XYZ color system. The chromaticity coordinates of the second emission color exist in the yellow - green or green region in the xy chromaticity diagram. The chromaticity coordinates of the third emission color exist in the blue - green or blue region in the xy chromaticity diagram. The chromaticity coordinates of the fourth emission color exist in the blue or blue - violet region in the xy chromaticity diagram. The light source device has a light emission color region in the form of a quadrilateral having a first line segment, a second line segment, a third line segment, and a fourth line segment as its four sides on the xy chromaticity diagram. The first line segment is a line segment connecting the chromaticity coordinates of the first emission color and the chromaticity coordinates of the second emission color. The second line segment is a line segment connecting the chromaticity coordinates of the second emission color and the chromaticity coordinates of the third emission color. The third line segment is a line segment connecting the chromaticity coordinates of the third emission color and the chromaticity coordinates of the fourth emission color. The fourth line segment is a line segment connecting the chromaticity coordinates of the fourth emission color and the chromaticity coordinates of the first emission color. The light emission color region includes white and white - based light emission colors defined in JIS Z8110 and pale colored lights outside the white - based light emission colors.

[0008] An illumination device according to one aspect of the present disclosure includes the light source device and a lighting device that lights the light source device.

[0009] An illumination system according to one aspect of the present disclosure includes the illumination device and a control device that controls the illumination device.

Advantages of the Invention

[0010] The light source device, illumination device, and illumination system of the present disclosure have the effect of being able to improve the reproducibility of white and the surrounding light emission colors.

Brief Description of the Drawings

[0011]

Figure 1

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Figure 9

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Figure 16

Embodiments for Carrying Out the Invention

[0012] Hereinafter, a light source device, a lighting device, and a lighting system according to embodiments of the present disclosure will be described in detail with reference to the drawings. However, each of the drawings described in the following embodiments is a schematic diagram, and the respective ratios of the sizes and thicknesses of the respective components do not necessarily reflect the actual dimensional ratios. Note that the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications can be made according to the design and the like as long as the effects of the present disclosure can be achieved.

[0013] (1) Overview The light source device 1 according to the embodiment includes a first light emitting element (first LED 11) that emits light of a first emission color, a second light emitting element (second LED 12) that emits light of a second emission color, a third light emitting element (third LED 13) that emits light of a third emission color, and a fourth light emitting element (fourth LED 14) that emits light of a fourth emission color (see FIG. 1).

[0014] The chromaticity coordinates C11 of the first emission color exist in the red region RD or the yellow - red region YR in the xy chromaticity diagram of the XYZ color system. The chromaticity coordinates C12 of the second emission color exist in the yellow - green region YG or the green region GR in the xy chromaticity diagram. The chromaticity coordinates C13 of the third emission color exist in the blue - green region BG or the blue region BL in the xy chromaticity diagram. The chromaticity coordinates C14 of the fourth emission color exist in the blue region BL or the blue - purple region PB in the xy chromaticity diagram (see FIGS. 4, 6, 8, and 10). Note that in FIGS. 4, 6, 8, and 10, "PL" is the purple region, "PR" is the red - purple region, and "YL" is the yellow region.

[0015] Further, the light source device 1 according to the embodiment has a light emission color region S1 in the xy chromaticity diagram that is a quadrilateral with four sides being a first line segment L1, a second line segment L2, a third line segment L3, and a fourth line segment L4 (see FIGS. 4, 6, 8, and 10). The first line segment L1 is a line segment connecting the chromaticity coordinates C11 of the first emission color and the chromaticity coordinates C12 of the second emission color. The second line segment L2 is a line segment connecting the chromaticity coordinates C12 of the second emission color and the chromaticity coordinates C13 of the third emission color. The third line segment L3 is a line segment connecting the chromaticity coordinates C13 of the third emission color and the chromaticity coordinates C14 of the fourth emission color. The fourth line segment L4 is a line segment connecting the chromaticity coordinates C14 of the fourth emission color and the chromaticity coordinates C11 of the first emission color. The light emission color region S1 includes white and white-based emission colors defined in JIS Z8110, and light pastel colors outside the white-based emission colors. Note that the "light pastel colors" are nine colors, namely, "light pink", "light yellowish red", "light yellow", "light yellowish green", "light green", "light blue-green", "light blue", "light purplish blue", and "light purple" (see FIG. 4).

[0016] Thus, the light source device 1 according to the embodiment can irradiate light of the emission color of the light emission color region S1 that includes white and white-based emission colors and light pastel colors outside the white-based emission colors by mixing one to four colors of light emitted from four types of light emitting elements (the first LED 11, the second LED 12, the third LED 13, and the fourth LED 14). As a result, the light source device 1 according to the embodiment can improve the reproducibility of white and the emission colors in its vicinity. Note that the light source device 1 according to the embodiment can reproduce white and white-based emission colors by mixing up to four colors of light, so it is also possible to improve the color rendering property (average color rendering evaluation number and special color rendering evaluation number).

[0017] Further, the lighting device 2 according to the embodiment includes the light source device 1 according to the embodiment and a lighting device 20 that lights the light source device 1 (see FIG. 1). Furthermore, the lighting system 9 according to the embodiment includes the lighting device 2 according to the embodiment and a control device 90 that controls the lighting device 2 (see FIG. 1).

[0018] Thus, the lighting device 2 and the lighting system 9 according to the embodiment can improve the reproducibility of white and the emission colors around it, similar to the light source device 1 according to the embodiment.

[0019] (2) Details (2-1) Details of the lighting device and the lighting system according to the embodiment The lighting system 9 according to the embodiment (hereinafter abbreviated as the lighting system 9) includes the lighting device 2 according to the embodiment (hereinafter abbreviated as the lighting device 2) and the control device 90 (see FIG. 1). The lighting system 9 desirably has a plurality of lighting devices 2. The lighting system 9 is used for applications such as stage lighting and performance lighting. However, the lighting system 9 may be used for applications other than stage lighting and performance lighting.

[0020] The control device 90 is, for example, a controller for stage lighting called a dimming console. The control device 90 includes at least two input devices called faders. The operation position of one fader corresponds to the light amount of the illumination light of the lighting device 2, and the operation position of the other fader corresponds to the light color of the illumination light of the lighting device 2. That is, the control device 90 generates an instruction value for the light amount and an instruction value for the light color of each lighting device 2 based on the operation position of the fader operated by the operator, and transmits a command (control signal) including the generated instruction value to each lighting device 2 via a communication cable.

[0021] Each lighting device 2 includes the light source device 1 according to the embodiment (hereinafter abbreviated as the light source device 1) and a lighting device 20 for lighting the light source device 1 (see FIG. 1). Each lighting device 2 further includes a control circuit 25 for controlling the lighting device 20 and a communication circuit 26 for communicating with the control device 90.

[0022] The lighting device 20 has a first lighting circuit 21, a second lighting circuit 22, a third lighting circuit 23, and a fourth lighting circuit 24. Since the first lighting circuit 21, the second lighting circuit 22, the third lighting circuit 23, and the fourth lighting circuit 24 have the same circuit configuration, the circuit configuration of the first lighting circuit 21 will be described as a representative.

[0023] The first lighting circuit 21 includes a rectifier circuit, a power factor correction circuit, a DC / DC converter, etc. The rectifier circuit is composed of, for example, a diode bridge, and full-wave rectifies the AC voltage supplied from the AC power system. The power factor correction circuit is composed of, for example, a boost chopper circuit, and improves the power factor by boosting the pulsating DC voltage output from the rectifier circuit. The DC / DC converter is composed of, for example, a buck chopper circuit, steps down the DC voltage output from the power factor correction circuit, and supplies a DC current (load current) to the light source device 1 to cause the light source device 1 to emit light (light up). However, the rectifier circuit and the power factor correction circuit may be configured separately from the first lighting circuit 21, the second lighting circuit 22, the third lighting circuit 23, and the fourth lighting circuit 24. That is, it is also possible to supply a DC voltage from a set of rectifier circuit and power factor correction circuit to the first lighting circuit 21, the second lighting circuit 22, the third lighting circuit 23, and the fourth lighting circuit 24.

[0024] The communication circuit 26 is configured to be communicable with the control device 90 via a communication cable. The communication circuit 26 has a function of transmitting and receiving a digital control signal (hereinafter referred to as a DMX signal) conforming to a communication standard suitable for lighting control, for example, DMX (Digital Multiplex) 512A. However, the communication circuit 26 may have a function of transmitting and receiving a control signal conforming to a communication standard other than DMX512A, for example, DALI (Digital Addressable Lighting Interface: registered trademark), or a wired LAN standard such as 100BASE-T and 1000BASE-T.

[0025] The control circuit 25 has a microcontroller as a main component. The control circuit 25 controls the lighting device 20 in response to a command received from the control device 90 through the communication circuit 26 by executing a lighting control program with the microcontroller, and performs operations such as blinking, dimming, and color adjustment of the light source device 1.

[0026] (2-2) Structure of the lighting device As shown in FIGS. 2 and 3, the lighting device 2 includes a light source unit 4 and a control unit 3. The lighting device 2 is a so-called horizontal light (lower horizontal light) used for illuminating a wall surface (horizontal plane) as a background such as a television station's shooting studio or stage (stage lighting, production lighting).

[0027] The control unit 3 has a metal housing 30 and a pair of arms 31. The housing 30 is formed in a box shape and houses the above-described lighting device 20, control circuit 25, communication circuit 26, etc. inside.

[0028] Each of the pair of arms 31 is formed in an arc shape by a metal plate. An arc-shaped groove 310 penetrates each of the pair of arms 31 in the thickness direction of the arm 31. The pair of arms 31 are screwed to both ends in the longitudinal direction of the housing 30 by two knob screws 32 inserted one by one into the respective grooves 310. The front ends of the pair of arms 31 are fixed to the rear surface of the main body 40 (see FIG. 3) of the light source unit 4.

[0029] The light source unit 4 includes a main body 40, two LED modules 41, a lens unit 42, and a diffusion member 43 (see FIG. 3). The two LED modules 41 correspond to the light source device 1 according to the embodiment. In the following description, unless otherwise specified, the front-rear, left-right, and up-down directions indicated by the arrows in FIG. 3 are defined as the front-rear, left-right, and up-down directions of the light source unit 4, respectively.

[0030] The main body 40 is formed in a long rectangular parallelepiped shape by a material with good thermal conductivity such as aluminum or an aluminum alloy (see FIG. 3). Two LED modules 41 are supported side by side in the longitudinal direction (left-right direction) on the front surface 400 of the main body 40. The two LED modules 41 are fixed to the front surface 400 of the main body 40 by, for example, screwing.

[0031] The two LED modules 41 have a common configuration. The LED module 41 has a rectangular substrate 410 and a plurality of LEDs 411 mounted on the front surface of the substrate 410 (see Fig. 3). The plurality of LEDs 411 are four types of LEDs (the first LED 11, the second LED 12, the third LED 13, and the fourth LED 14) with different emission colors from each other. However, the LED module 41 (light source device 1) will be described in detail in the section of “(2-3) Configuration of the light source device”.

[0032] The diffusion member 43 is formed in a rectangular flat plate shape by a synthetic resin material having translucency such as acrylic resin or polycarbonate resin (see Fig. 3).

[0033] The diffusion member 43 is configured to diffuse the transmitted light, for example, by being formed by filling a filler such as titanium oxide, glass beads, or mica into the synthetic resin material. Alternatively, the diffusion member 43 may be configured to diffuse the transmitted light by being subjected to uneven processing or embossing on the surface or both the front and back surfaces.

[0034] The lens unit 42 has a first lens block 421, a second lens block 422, and a base 420 (see Fig. 3). Note that the first lens block 421, the second lens block 422, and the base 420 are integrally formed as a molded body of a synthetic resin having translucency such as acrylic resin or polycarbonate resin.

[0035] The base 420 is formed in a rectangular flat plate shape. A first lens block 421 and a second lens block 422 are provided on the rear surface of the base 420. The first lens block 421 is provided along the longitudinal direction of the base 420 on the lower side of the rear surface of the base 420. The second lens block 422 is provided along the longitudinal direction of the base 420 on the upper side of the rear surface of the base 420. Therefore, the front surface of the base 420 becomes the light-emitting surfaces of the first lens block 421 and the second lens block 422. The first lens block 421 and the second lens block 422 are each configured to control the light distribution of the light emitted from the LED module 41.

[0036] Here, the lens unit 42 is attached to the main body 40 so as to cover the two LED modules 41 from the front. Also, the diffusion member 43 is attached to the main body 40 so as to cover the front surface of the base 420 of the lens unit 42.

[0037] The light source unit 4 is rotatably attached to the housing 30 of the control unit 3 by two hinges 33 (see Figure 2). However, the light source unit 4 is rotatable along the grooves 310 of the pair of arms 31 and is fixed at an arbitrary position of the arm 31 by being tightened by two knob screws 32.

[0038] (2-3) Configuration of the light source device The light source device 1 has a plurality of four types of LEDs, namely a first LED 11, a second LED 12, a third LED 13, and a fourth LED 14. These four types of LEDs are so-called package-type (surface-mount type) LEDs. The package-type LED has an LED chip that emits light by current excitation, a substrate on which the LED chip is mounted, an anode electrode and a cathode electrode supported by the substrate, bonding wires that electrically connect the LED chip to the anode electrode and the cathode electrode, and a sealing portion that seals at least the LED chip and the bonding wires.

[0039] The sealing portion is formed of a synthetic resin having translucency such as silicone resin. However, a phosphor for wavelength conversion may be mixed into the synthetic resin forming the sealing portion. That is, in the case of an LED of a type in which no phosphor is mixed into the sealing portion (hereinafter, sometimes referred to as "LED (without phosphor)"), the emission color of the light emitted from the LED chip and the emission color of the light transmitted through the sealing portion and emitted to the outside of the LED are the same. On the other hand, in the case of an LED of a type in which a phosphor is mixed into the sealing portion (hereinafter, sometimes referred to as "LED (with phosphor)"), the emission color of the light emitted from the LED chip and the emission color of the light transmitted through the sealing portion and emitted to the outside of the LED are different. In the following description, unless otherwise specified, the emission color of the LED means the emission color of the light transmitted through the sealing portion and emitted to the outside of the LED. Also, the emission color of the first LED 11 is referred to as the first emission color, the emission color of the second LED 12 is referred to as the second emission color, the emission color of the third LED 13 is referred to as the third emission color, and the emission color of the fourth LED 14 is referred to as the fourth emission color.

[0040] In the embodiment, each of the first LED 11, the second LED 12, the third LED 13, and the fourth LED 14 is an LED (with phosphor) having an LED chip with a blue emission color and a sealing portion in which a phosphor is mixed, and their emission colors are different depending on the type of the phosphor and the like.

[0041] For example, the chromaticity coordinates C11 of the first emission color of the first LED 11 are x = 0.595 and y = 0.368, and the chromaticity coordinates C12 of the second emission color of the second LED 12 are x = 0.321 and y = 0.550. Also, the chromaticity coordinates C13 of the third emission color of the third LED 13 are x = 0.179 and y = 0.290, and the chromaticity coordinates C14 of the fourth emission color of the fourth LED 14 are x = 0.165 and y = 0.125. Here, the xy chromaticity diagram in which the chromaticity coordinates C11 of the first emission color, the chromaticity coordinates C12 of the second emission color, the chromaticity coordinates C13 of the third emission color, and the chromaticity coordinates C14 of the fourth emission color are plotted is shown in FIGS. 4 and 5. Note that the xy chromaticity diagram in FIG. 4 corresponds to Reference Figure 1 of JIS Z8110.

[0042] As shown in FIG. 4, the chromaticity coordinates C11 of the first emission color exist in the yellow-red region YR in the xy chromaticity diagram. The chromaticity coordinates C12 of the second emission color exist in the yellow-green region YG in the xy chromaticity diagram. The chromaticity coordinates C13 of the third emission color exist in the blue-green region BG in the xy chromaticity diagram. The chromaticity coordinates C14 of the fourth emission color exist in the blue region BL in the xy chromaticity diagram.

[0043] Here, on the xy chromaticity diagram, assume a light-emitting color region S1 that is a quadrilateral with four line segments, namely the first line segment L1, the second line segment L2, the third line segment L3, and the fourth line segment L4, as its four sides (see FIG. 4). However, the first line segment L1 is a line segment connecting the chromaticity coordinates C11 of the first emission color and the chromaticity coordinates C12 of the second emission color. The second line segment L2 is a line segment connecting the chromaticity coordinates C12 of the second emission color and the chromaticity coordinates C13 of the third emission color. The third line segment L3 is a line segment connecting the chromaticity coordinates C13 of the third emission color and the chromaticity coordinates C14 of the fourth emission color. The fourth line segment L4 is a line segment connecting the chromaticity coordinates C14 of the fourth emission color and the chromaticity coordinates C11 of the first emission color.

[0044] As shown in FIG. 4, the light-emitting color region S1 includes the white region WH and the light-emitting color regions of white systems defined in JIS Z8110, and the light pastel-colored regions outside the light-emitting color regions of white systems. The light-emitting color regions of white systems are five regions: the light pink region LPK, the yellowish white region YW, the greenish white region GW, the bluish white region BW, and the purplish white region PW. Also, in the embodiment, the light pastel-colored regions include the light yellow-red region LYR, the light yellow region LY, the light yellow-green region LYG, the light green region LG, the light blue-green region LBG, the light blue region LB, the light purple-blue region LPB, and the light purple region LPL. However, in the embodiment, the purple-pink region PP, the pink region PK, and the orange-pink region OP are not included in the light pastel-colored regions.

[0045] The light source device 1 can emit light of an arbitrary emission color within the emission color region S1 as light obtained by mixing at least one color or a plurality of colors among the first emission color, the second emission color, the third emission color, and the fourth emission color by adjusting the light amounts of the first LED 11, the second LED 12, the third LED 13, and the fourth LED 14. Note that the light amount of the first LED 11 is proportional to the current flowing through the first LED 11 (the load current of the first lighting circuit 21), and the light amount of the second LED 12 is proportional to the current flowing through the second LED 12 (the load current of the second lighting circuit 22). Similarly, the light amount of the third LED 13 is proportional to the current flowing through the third LED 13 (the load current of the third lighting circuit 23), and the light amount of the fourth LED 14 is proportional to the current flowing through the fourth LED 14 (the load current of the fourth lighting circuit 24).

[0046] Here, the control circuit 25 mainly includes a microcontroller. Therefore, the control circuit 25 can only discretely adjust the direct current supplied from the lighting device 20 to the light source device 1. That is, the number of chromaticity coordinates that can be adjusted by the control circuit 25 is determined by the memory capacity of the microcontroller. Therefore, without increasing the memory capacity, as the emission color region on the xy chromaticity diagram becomes wider, the control circuit 25 will increase the number of chromaticity coordinates that cannot be adjusted.

[0047] On the other hand, the light source device 1 includes white and white-based emission colors and light pastel colors outside the white-based emission colors within the emission color region S1 surrounded by the line segments L1 - L4 connecting the chromaticity coordinates C11 - C14 of the four types of emission colors. That is, the light source device 1 can improve the reproducibility (increase the number of reproducible chromaticity coordinates) of white and white-based emission colors and light pastel colors outside the white-based emission colors while suppressing an increase in the memory capacity.

[0048] Here, at least one of the four sides (the first line segment L1, the second line segment L2, the third line segment L3, and the fourth line segment L4) of the light emission color region S1 preferably contacts or intersects the boundary line outside the light pastel color regions LPK, LYR, LY, LYG, LG, LBG, LB, LPB, and LPL (the side away from the white region WH). However, "intersecting the boundary line" means that at least one of the chromaticity coordinates of the plurality of chromaticity coordinates through which each of the first line segment L1, the second line segment L2, the third line segment L3, and the fourth line segment L4 passes on the xy chromaticity diagram coincides with the chromaticity coordinate belonging to the "boundary line". Further, "contacting the boundary line" means the case where the shortest distance between the plurality of chromaticity coordinates through which each line segment passes and the plurality of chromaticity coordinates belonging to the "boundary line" is within a predetermined range. The "predetermined range" referred to here is preferably a numerical range of the order of the error (such as the measurement error of the measuring instrument) when obtaining the chromaticity coordinates of the LED. However, the "predetermined range" is not limited to the above numerical range.

[0049] Thus, since the light source device 1 makes at least one of the four sides of the light emission color region S1 contact or intersect the boundary line outside the light pastel color region, it is possible to further improve the reproducibility of white and white-based light emission colors and the light pastel color outside the white-based light emission colors.

[0050] Here, in order to satisfy the above condition that the third line segment L3 contacts or intersects the boundary line outside the light emission color region S1, the light source device 1 makes the region where the chromaticity coordinate C13 of the third light emission color exists different from the region where the chromaticity coordinate C14 of the fourth light emission color exists (see FIG. 4). That is, the light source device 1 can bring the third line segment L3 closer to the boundary line outside the light emission color region S1 by making the region where the chromaticity coordinate C13 of the third light emission color exists different from the region where the chromaticity coordinate C14 of the fourth light emission color exists. As a result, the light source device 1 can further improve the reproducibility of white and the light emission colors around it.

[0051] Furthermore, in order to satisfy the condition that the fourth line segment L4 touches or intersects the outer boundary line of the emission color region S1, the light source device 1 overlaps the fourth line segment L4 with at least one of the pink region PK or the purple-pink region PP in the xy chromaticity diagram (see FIG. 4). That is, the light source device 1 can bring the fourth line segment L4 closer to the outer boundary line of the emission color region S1 by overlapping the fourth line segment L4 with at least one of the pink region PK or the purple-pink region PP. As a result, the light source device 1 can further improve the reproducibility of white and the emission colors in its vicinity.

[0052] In addition, the light source device 1 includes all the chromaticity ranges of daylight color, cool white, white, warm white, and incandescent color defined in JIS Z9112 in the emission color region S1 (see FIG. 5). The respective correlated color temperatures of daylight color, cool white, white, warm white, and incandescent color are 5700K - 7100K, 4600K - 5500K, 3800K - 4500K, 3250K - 3800K, and 2600K - 3250K.

[0053] Thus, by including all the chromaticity ranges of daylight color, cool white, white, warm white, and incandescent color in the emission color region S1, the light source device 1 can further improve the reproducibility of the emission color of so-called white (daylight color, cool white, white, warm white, and incandescent color) and the color rendering property.

[0054] Furthermore, the light source device 1 includes in the emission color region S1 a chromaticity range having a lower correlated color temperature than incandescent color (see FIG. 5). The solid curve CL1 in FIG. 5 indicates the blackbody locus, and the plurality of points and numerical values on the curve CL1 indicate the correlated color temperature (unit: K (Kelvin)). Here, the lower limit value of the chromaticity range having a lower correlated color temperature than incandescent color is preferably, for example, 2000K or 1563K. Note that 1563K is the lower limit value of the correlated color temperature shown in Table B.1 in Appendix B of JIS Z8725.

[0055] Thus, the light source device 1 can reproduce a light emission color with a color temperature lower than that of a light bulb color by including the light emission color region S1 up to a chromaticity range with a color temperature lower than that of the light bulb color.

[0056] Incidentally, the combination of the chromaticity coordinates C11 - C14 of the first to fourth light emission colors is not limited to the combination described above (referred to as the first combination). For example, the following three types of combinations may be used.

[0057] In the second combination, the chromaticity coordinates C11 of the first light emission color of the first LED 11 are x = 0.571 and y = 0.332, and the chromaticity coordinates C12 of the second light emission color of the second LED 12 are x = 0.363 and y = 0.542. Also, the chromaticity coordinates C13 of the third light emission color of the third LED 13 are x = 0.141 and y = 0.302, and the chromaticity coordinates C14 of the fourth light emission color of the fourth LED 14 are x = 0.198 and y = 0.152. Here, the xy chromaticity diagram of the XYZ color system in which the chromaticity coordinates C11 of the first light emission color, the chromaticity coordinates C12 of the second light emission color, the chromaticity coordinates C13 of the third light emission color, and the chromaticity coordinates C14 of the fourth light emission color in the second combination are plotted are shown in FIGS. 6 and 7. As shown in FIG. 6, the chromaticity coordinates C11 of the first light emission color exist in the red region RD in the xy chromaticity diagram. The chromaticity coordinates C12 of the second light emission color exist in the yellow - green region YG in the xy chromaticity diagram. The chromaticity coordinates C13 of the third light emission color exist in the blue - green region BG in the xy chromaticity diagram. The chromaticity coordinates C14 of the fourth light emission color exist in the purple - blue region PB in the xy chromaticity diagram.

[0058] In the third combination, the chromaticity coordinates C11 of the first emission color of the first LED 11 are x = 0.681 and y = 0.315, and the chromaticity coordinates C12 of the second emission color of the second LED 12 are x = 0.321 and y = 0.545. Also, the chromaticity coordinates C13 of the third emission color of the third LED 13 are x = 0.179 and y = 0.290, and the chromaticity coordinates C14 of the fourth emission color of the fourth LED 14 are x = 0.165 and y = 0.155. Here, the xy chromaticity diagrams in the XYZ colorimetric system plotting the chromaticity coordinates C11 of the first emission color, the chromaticity coordinates C12 of the second emission color, the chromaticity coordinates C13 of the third emission color, and the chromaticity coordinates C14 of the fourth emission color in the third combination are shown in FIGS. 8 and 9. As shown in FIG. 8, the chromaticity coordinates C11 of the first emission color exist in the red region RD in the xy chromaticity diagram. The chromaticity coordinates C12 of the second emission color exist in the yellow-green region YG in the xy chromaticity diagram. The chromaticity coordinates C13 of the third emission color exist in the blue-green region BG in the xy chromaticity diagram. The chromaticity coordinates C14 of the fourth emission color exist in the blue region BL in the xy chromaticity diagram.

[0059] In the fourth combination, the chromaticity coordinates C11 of the first emission color of the first LED 11 are x = 0.601 and y = 0.395, and the chromaticity coordinates C12 of the second emission color of the second LED 12 are x = 0.315 and y = 0.530. Also, the chromaticity coordinates C13 of the third emission color of the third LED 13 are x = 0.161 and y = 0.260, and the chromaticity coordinates C14 of the fourth emission color of the fourth LED 14 are x = 0.202 and y = 0.126. Here, the xy chromaticity diagrams in the XYZ colorimetric system plotting the chromaticity coordinates C11 of the first emission color, the chromaticity coordinates C12 of the second emission color, the chromaticity coordinates C13 of the third emission color, and the chromaticity coordinates C14 of the fourth emission color in the fourth combination are shown in FIGS. 10 and 11. As shown in FIG. 10, the chromaticity coordinates C11 of the first emission color exist in the yellowish red region YR in the xy chromaticity diagram. The chromaticity coordinates C12 of the second emission color exist in the yellow-green region YG in the xy chromaticity diagram. The chromaticity coordinates C13 of the third emission color exist in the blue-green region BG in the xy chromaticity diagram. The chromaticity coordinates C14 of the fourth emission color exist in the purplish blue region PB in the xy chromaticity diagram.

[0060] When the light source device 1 adopts any one of the second combination, the third combination, and the fourth combination, similar to the case of adopting the first combination, it is possible to improve the reproducibility of white and white-based emission colors and light pastel-colored emission colors outside the white-based emission colors, and to improve the color rendering property.

[0061] Here, in the third combination, the region surrounded by the first line segment L1, the fourth line segment L4, and the boundary line outside the emission color region S1 is wider than the regions surrounded by the boundary lines of the first line segment L1 and the second line segment L2, the second line segment L2 and the third line segment L3, and the third line segment L3 and the fourth line segment L4, respectively (see FIG. 8). That is, when the light source device 1 adopts the third combination, it can reproduce a white emission color with a correlated color temperature of 2000 K or higher (see FIG. 9). Note that when the light source device 1 adopts the fourth combination, it can reproduce a white emission color with a correlated color temperature of 1500 K or higher (see FIG. 11).

[0062] Incidentally, in the third combination and the fourth combination, it is preferable that the first LED 11 is composed of an LED (without a phosphor), and the second LED 12, the third LED 13, and the fourth LED 14 are composed of LEDs (with a phosphor). That is, since the chromaticity coordinates of the first emission color in each of the third combination and the fourth combination are both on the red spectral locus in the xy chromaticity diagram, the luminous efficiency can be improved by configuring the first LED 11 with an LED (without a phosphor).

[0063] (2-4) Arrangement of LEDs in the light source device Next, the arrangement of the first LED 11, the second LED 12, the third LED 13, and the fourth LED 14 in the light source device 1 will be described with reference to the drawings. In the following three types of arrangement examples, the longitudinal direction of the long substrate 15 on which the first LED 11, the second LED 12, the third LED 13, and the fourth LED 14 are mounted is defined as the first direction D1, and the short-side direction of the substrate 15 is defined as the second direction D2 (see FIG. 12).

[0064] (2-4-1) First arrangement example As shown in FIG. 12, in the first arrangement example, a plurality of first LEDs 11 and a plurality of fourth LEDs 14 are arranged so as to be alternately arranged in a single row along the first direction D1. Also, in the first arrangement example, a plurality of second LEDs 12 and a plurality of third LEDs 13 are arranged so as to be alternately arranged in a single row along the first direction D1. Further, the first LED 11 and the third LED 13 are arranged so as to be aligned along the second direction D2, and the second LED 12 and the fourth LED 14 are arranged so as to be aligned along the second direction D2. And the interval d2 between the first LED 11 and the third LED 13 along the second direction D2 and the interval d2 between the second LED 12 and the fourth LED 14 along the second direction D2 are narrower than the interval d1 between the first LED 11 and the fourth LED 14 along the first direction D1 and the interval d1 between the second LED 12 and the third LED 13 along the first direction D1 (d2 < d1). However, the intervals d1 and d2 between the respective LEDs are equal to the distances between the LED chips of the respective LEDs.

[0065] When the light source device 1 reproduces the light in the white region WH of the xy chromaticity diagram shown in FIGS. 4, 6, 8, and 10, it is necessary to emit light from four types of LEDs (first LED 11, second LED 12, third LED 13, fourth LED 14).

[0066] In the first arrangement example, the light source device 1 arranges the pair of the first LED 11 and the third LED 13 with the chromaticity coordinates C11 and C13 at the diagonal positions of the emission color region S1 and the pair of the second LED 12 and the fourth LED 14 with the chromaticity coordinates C12 and C14 along the second direction D2. Therefore, the light source device 1 can adjust the emission color obtained by mixing the first emission color and the third emission color and the emission color obtained by mixing the second emission color and the fourth emission color to the emission color in the white region WH, respectively. Moreover, the light source device 1 makes the interval d2 between the LEDs along the second direction D2 narrower than the interval d1 between the LEDs along the first direction D1. As a result, the light source device 1 can suppress color unevenness when reproducing the light in the white region WH.

[0067] (2-4-2) Second arrangement example The second arrangement example is basically the same as the first arrangement example. However, in the second arrangement example, in the light source device 1, the first LED 11 and the third LED 13, and the second LED 12 and the fourth LED 14 have swapped their respective arrangements in the second direction D2 alternately along the first direction D1 (see Fig. 13).

[0068] That is, in the first arrangement example, the light source device 1 arranges the first LED 11 and the fourth LED 14 alternately and in a single row along the first direction D1, and arranges the second LED 12 and the third LED 13 alternately and in a single row along the first direction D1. In contrast, in the second arrangement example, the light source device 1 makes the arrangement along the second direction D2 the same as that in the first arrangement example, and then arranges the first LED 11, the second LED 12, the third LED 13, and the fourth LED 14 in order and in a single row along the first direction D1 (see Fig. 13). Therefore, similar to the case of the first arrangement example, the light source device 1 can adjust the emission color obtained by mixing the first emission color and the third emission color, and the emission color obtained by mixing the second emission color and the fourth emission color, to the emission color of the white region WH respectively. Moreover, by adopting the second arrangement example, the light source device 1 can further suppress color unevenness in the second direction D2 compared with the case of adopting the first arrangement example.

[0069] (2-4-3) The third arrangement example In the third arrangement example, the light source device 1 arranges the first LED 11, the second LED 12, the third LED 13, and the fourth LED 14 in a single row along the first direction D1 (see Fig. 14). Further, the light source device 1 arranges the first LED 11 and the second LED 12, and the third LED 13 and the fourth LED 14 so that they are not adjacent to each other respectively (see Fig. 14). Specifically, the light source device 1 arranges the third LED 13 and the fourth LED 14 adjacent to the first LED 11, and arranges the third LED 13 and the fourth LED 14 adjacent to the second LED 12. That is, the light source device 1 alternately arranges the third LED 13 and the fourth LED 14 between the first LED 11 and the second LED 12.

[0070] Here, the third arrangement example arranges four types of LEDs in a single row so as to satisfy the following two conditions.

[0071] The first condition is to arrange the first LED 11 and the third LED 13, which are located at the diagonal of the light emission color region S1, adjacent to each other, and also to arrange the second LED 12 and the fourth LED 14, which are located at the diagonal of the light emission color region S1, adjacent to each other.

[0072] The second condition is that when arranging LEDs that are not located at the diagonal of the light emission color region S1 adjacent to each other, arrange an LED with a larger distance between two adjacent LEDs next to it. Specifically, since the fourth line segment L4 is longer than the first line segment L1 in the light source device 1, the fourth LED 14 is arranged next to the first LED 11 instead of the second LED 12.

[0073] Thus, by adopting the third arrangement example, the light source device 1 can avoid adjacent LEDs with relatively close distances on the xy chromaticity diagram when arranging four types of LEDs in a row along the longitudinal direction (the first direction D1) of the substrate 15. As a result, the light source device 1 can suppress color unevenness when reproducing the light of the white region WH.

[0074] (2-5) Modifications of the lighting device according to the embodiment Finally, several modifications of the lighting device according to the embodiment will be described.

[0075] (2-5-1) Modification 1 As shown in FIG. 15, the lighting device 5 of Modification 1 applies the light source device according to the embodiment to a spherical LED lamp.

[0076] The lighting device 5 of Modification Example 1 includes a frustum-shaped lamp body 50, a cover 51 attached to the large-diameter bottom surface of the lamp body 50, and a base 52 provided on the small-diameter bottom surface of the lamp body 50. A light source device and a lighting device are accommodated inside the lamp body 50. The cover 51 is formed in a spherical shape by glass or a synthetic resin having translucency. However, for the light source device in Modification Example 1, it is preferable to mount, for example, the first LED 11, the second LED 12, the third LED 13, and the fourth LED 14 side by side in the circumferential direction on the surface of a disc-shaped substrate. The cover 51 is attached to the lamp body 50 so as to cover the light source device. The illumination light emitted from the light source device is diffused when passing through the cover 51 and irradiated onto the illumination space. Note that the lighting device is electrically connected to the base 52. The lighting device 5 is attached to the lighting fixture, for example, by mounting the base 52 on a socket of the lighting fixture for an incandescent lamp.

[0077] (2-5-2) Modification Example 2 The lighting device 6 of Modification Example 2 includes a light source device 1 composed of a so-called straight tube LED lamp, an appliance body 60, a pair of lamp sockets 61, and a power supply unit 62 (see FIG. 16).

[0078] The light source device 1 includes, for example, a cover 100 formed in a long cylindrical shape by a synthetic resin having translucency such as acrylic resin or polycarbonate resin, and a pair of bases 101 provided at both ends of the cover 100. An LED module is accommodated inside the cover 100. The LED module is configured by mounting four types of LEDs (the first LED, the second LED, the third LED, and the fourth LED) on the surface of a long substrate.

[0079] The appliance body 60 is formed in a long trapezoidal shape by a metal plate. The appliance body 60 is directly attached to the ceiling. A pair of lamp sockets 61 project one by one from both ends in the longitudinal direction on the bottom surface of the appliance body 60. Note that inside the appliance body 60, a power supply unit 62 that houses a lighting device, a control circuit, and a communication circuit in a case is accommodated.

[0080] The lighting device 6 of Modification 2 is configured by attaching a pair of bases 101 to a pair of lamp sockets 61 one by one, thereby attaching the light source device 1 to the fixture main body 60. The light source device 1 is lit (emits light) by being supplied with a direct current from the power supply unit 62 through a pair of lamp sockets 61 and a pair of bases 101.

[0081] (3) Summary The light source device (1) according to the first aspect of the present disclosure includes a first light emitting element (first LED 11) that emits light of a first emission color, a second light emitting element (second LED 12) that emits light of a second emission color, a third light emitting element (third LED 13) that emits light of a third emission color, and a fourth light emitting element (fourth LED 14) that emits light of a fourth emission color. The chromaticity coordinates (C11) of the first emission color exist in the red region (RD) or the yellow - red region (YR) in the xy chromaticity diagram of the XYZ color system. The chromaticity coordinates (C12) of the second emission color exist in the yellow - green region (YG) or the green region (GR) in the xy chromaticity diagram. The chromaticity coordinates (C13) of the third emission color exist in the blue - green region (BG) or the blue region (BL) in the xy chromaticity diagram. The chromaticity coordinates (C14) of the fourth emission color exist in the blue region (BL) or the blue - purple region (PB) in the xy chromaticity diagram. The light source device (1) according to the first aspect has a light emission color region (S1) in the xy chromaticity diagram, which is a quadrilateral with four sides being a first line segment (L1), a second line segment (L2), a third line segment (L3), and a fourth line segment (L4). The first line segment (L1) is a line segment connecting the chromaticity coordinates (C11) of the first emission color and the chromaticity coordinates (C12) of the second emission color. The second line segment (L2) is a line segment connecting the chromaticity coordinates (C12) of the second emission color and the chromaticity coordinates (C13) of the third emission color. The third line segment (L3) is a line segment connecting the chromaticity coordinates (C13) of the third emission color and the chromaticity coordinates (C14) of the fourth emission color. The fourth line segment (L4) is a line segment connecting the chromaticity coordinates (C14) of the fourth emission color and the chromaticity coordinates (C11) of the first emission color. The light emission color region (S1) includes white and white - based light emission colors defined in JIS Z8110, and pale colored lights outside the white - based light emission colors.

[0082] The light source device (1) according to the first aspect can irradiate light of a light emission color in a light emission color region (S1) that includes white and white-based light emission colors, and a pale chromatic color outside the white-based light emission colors, by mixing four colors of light emitted from four types of light emitting elements (first LED 11, second LED 12, third LED 13, fourth LED 14). As a result, the light source device (1) according to the first aspect can improve the reproducibility of white and the surrounding light emission colors.

[0083] The light source device (1) according to the second aspect of the present disclosure can be realized by combination with the first aspect. In the light source device (1) according to the second aspect, it is preferable that at least one of the first line segment (L1), the second line segment (L2), the third line segment (L3), and the fourth line segment (L4) is in contact with or intersects the boundary line outside the pale chromatic color.

[0084] The light source device (1) according to the second aspect can further improve the reproducibility of white and the surrounding light emission colors.

[0085] The light source device (1) according to the third aspect of the present disclosure can be realized by combination with the second aspect. In the light source device (1) according to the third aspect, it is preferable that the region where the chromaticity coordinates (C13) of the third light emission color exist and the region where the chromaticity coordinates (C14) of the fourth light emission color exist are different.

[0086] The light source device (1) according to the third aspect can further improve the reproducibility of white and the surrounding light emission colors by bringing the third line segment (L3) closer to the outer boundary of the light emission color region (S1).

[0087] The light source device (1) according to the fourth aspect of the present disclosure can be realized by combination with any one of the first to third aspects. In the light source device (1) according to the fourth aspect, it is preferable that the fourth line segment (L4) overlaps at least one of the pink region (PK) or the purple-pink region (PP) in the xy chromaticity diagram.

[0088] The light source device (1) according to the fourth aspect can bring the fourth line segment (L4) closer to the outer boundary line of the emission color region (S1) by overlapping at least one of the pink region (PK) or the purpleish pink region (PP) with the fourth line segment (L4). As a result, the light source device (1) according to the fourth aspect can further improve the reproducibility of white and the emission colors in its vicinity.

[0089] The light source device (1) according to the fifth aspect of the present disclosure can be realized by a combination with any one of the first to fourth aspects. In the light source device (1) according to the fifth aspect, the region surrounded by the outer boundary line of the faint chromatic color between the first line segment (L1) and the fourth line segment (L4) is preferably wider than the regions surrounded by the boundary lines with the first line segment (L1) and the second line segment (L2), the second line segment (L2) and the third line segment (L3), and the third line segment (L3) and the fourth line segment (L4), respectively.

[0090] The light source device (1) according to the fifth aspect can reproduce emission colors with a lower correlated color temperature.

[0091] The light source device (1) according to the sixth aspect of the present disclosure can be realized by a combination with any one of the first to fifth aspects. In the light source device (1) according to the sixth aspect, the emission color region (S1) preferably includes all chromaticity ranges of daylight color, cool white, white, warm white, and incandescent color defined in JIS Z9112.

[0092] The light source device (1) according to the sixth aspect can further improve the reproducibility of so-called white (daylight color, cool white, white, warm white, and incandescent color) emission colors.

[0093] The light source device (1) according to the seventh aspect of the present disclosure can be realized by a combination with the sixth aspect. In the light source device (1) according to the seventh aspect, the emission color region (S1) preferably includes chromaticity ranges with a lower correlated color temperature than incandescent color.

[0094] The light source device (1) according to the seventh aspect can reproduce a light emission color having a color temperature lower than that of a light bulb color by including the light emission color region (S1) up to a chromaticity range having a color temperature lower than that of a light bulb color.

[0095] The light source device (1) according to the eighth aspect of the present disclosure can be realized by a combination with any one of the first to seventh aspects. In the light source device (1) according to the eighth aspect, it is preferable that the first light emitting element is configured to emit the light radiated from the semiconductor element without wavelength conversion. It is preferable that the second light emitting element, the third light emitting element, and the fourth light emitting element are each configured to emit a part of the light radiated from the corresponding semiconductor element after wavelength conversion.

[0096] Since the first light emitting element of the light source device (1) according to the eighth aspect is configured to emit the light radiated from the semiconductor element without wavelength conversion, it is possible to improve the light emission efficiency.

[0097] The light source device (1) according to the ninth aspect of the present disclosure can be realized by a combination with any one of the first to eighth aspects. In the light source device (1) according to the ninth aspect, it is preferable that the plurality of first light emitting elements and the plurality of fourth light emitting elements are arranged to be alternately arranged in a row along the first direction (D1). It is preferable that the plurality of second light emitting elements and the plurality of third light emitting elements are arranged to be alternately arranged in a row along the first direction (D1). It is preferable that the first light emitting element and the third light emitting element are arranged to be arranged along the second direction (D2) intersecting the first direction (D1). It is preferable that the second light emitting element and the fourth light emitting element are arranged to be arranged along the second direction (D2). The interval (d2) between the first light emitting element and the third light emitting element along the second direction (D2) and the interval (d2) between the second light emitting element and the fourth light emitting element along the second direction (D2) are preferably narrower than the interval (d1) between the first light emitting element and the fourth light emitting element along the first direction (D1) and the interval (d1) between the second light emitting element and the third light emitting element along the first direction (D1).

[0098] The light source device (1) according to the ninth aspect can suppress color unevenness when reproducing the light in the white region (WH).

[0099] The light source device (1) according to the tenth aspect of the present disclosure can be realized by combination with the ninth aspect. In the light source device (1) according to the tenth aspect, it is preferable that the first light emitting element and the third light emitting element, and the second light emitting element and the fourth light emitting element alternately exchange their respective arrangements in the second direction (D2) along the first direction (D1).

[0100] The light source device (1) according to the tenth aspect can further suppress color unevenness in the second direction (D2).

[0101] The light source device (1) according to the eleventh aspect of the present disclosure can be realized by combination with the ninth aspect. In the light source device (1) according to the eleventh aspect, a plurality of first light emitting elements, a plurality of second light emitting elements, a plurality of third light emitting elements, and a plurality of fourth light emitting elements are arranged in a line along the first direction (D1), and it is preferable that the first light emitting element and the second light emitting element, and the third light emitting element and the fourth light emitting element are not adjacent to each other respectively.

[0102] The light source device (1) according to the eleventh aspect can suppress color unevenness when reproducing light in the white region (WH).

[0103] The lighting device (2; 5; 6) according to the twelfth aspect of the present disclosure includes the light source device (1) according to any one of the first to twelfth aspects and a lighting device (20) for lighting the light source device (1).

[0104] The lighting device (2; 5; 6) according to the twelfth aspect can improve the reproducibility of white and the surrounding emission colors.

[0105] The lighting system (9) according to the thirteenth aspect of the present disclosure includes the lighting device (2; 5; 6) according to the twelfth aspect and a control device (90) for controlling the lighting device (2; 5; 6).

[0106] The lighting system (9) according to the thirteenth aspect can improve the reproducibility of white and the surrounding emission colors.

Explanation of reference numerals

[0107] 1 Light source device 2 Lighting device 5 Lighting device 6 Lighting device 9 Lighting system 11 First LED (first light-emitting element) 12 Second LED (second light-emitting element) 13 Third LED (third light-emitting element) 14 Fourth LED (fourth light-emitting element) 20 Lighting device 90 Control device C11 Chromaticity coordinates of the first emission color C12 Chromaticity coordinates of the second emission color C13 Chromaticity coordinates of the third emission color C14 Chromaticity coordinates of the fourth emission color L1 First line segment L2 Second line segment L3 Third line segment L4 Fourth line segment RD Red region YR Yellow-red region YG Yellow-green region GR Green region BG Blue-green region BL Blue region PB Purple-blue region S1 Emission color region PK Pink region PP Purple-tinged pink region D1 First direction D2 Second direction d1 Distance between the first light-emitting element and the fourth light-emitting element d2 Distance between the second light-emitting element and the fourth light-emitting element

Claims

1. A first light-emitting element that emits light of a first emission color, A second light-emitting element that emits light of a second emission color, A third light-emitting element that emits light of a third emission color, A fourth light-emitting element that emits light of a fourth emission color, comprising the chromaticity coordinates of the first emission color are present in the red or yellow-red region in the xy chromaticity diagram of the XYZ color system, the chromaticity coordinates of the second emission color are present in the yellow-green or green region in the xy chromaticity diagram, the chromaticity coordinates of the third emission color are present in the blue-green or blue region in the xy chromaticity diagram, the chromaticity coordinates of the fourth emission color are present in the blue or blue-violet region in the xy chromaticity diagram, on the xy chromaticity diagram, a first line segment connecting the chromaticity coordinates of the first emission color and the chromaticity coordinates of the second emission color, a second line segment connecting the chromaticity coordinates of the second emission color and the chromaticity coordinates of the third emission color, a third line segment connecting the chromaticity coordinates of the third emission color and the chromaticity coordinates of the fourth emission color, and a fourth line segment connecting the chromaticity coordinates of the fourth emission color and the chromaticity coordinates of the first emission color, having a light-emitting color region in the shape of a quadrilateral with these four sides, the light-emitting color region includes white and white-based light-emitting colors defined in JIS Z8110 and pale colored light outside the white-based light-emitting colors, a light source device.

2. at least one of the first line segment, the second line segment, the third line segment, and the fourth line segment is in contact with or intersects the boundary line outside the pale colored light, The light source device according to Claim 1.

3. the region where the chromaticity of the third emission color exists is different from the region where the chromaticity of the fourth emission color exists, The light source device according to Claim 2.

4. the fourth line segment overlaps at least one of the pink region or the purple-pink region in the xy chromaticity diagram, The light source device according to any one of claims 1 to 3.

5. The region surrounded by the first line segment, the fourth line segment, and the outer boundary line of the pale chromatic color is wider than the regions surrounded by the first line segment and the second line segment, the second line segment and the third line segment, and the third line segment and the fourth line segment respectively and the boundary line. The light source device according to any one of claims 1 to 3.

6. The light emission color region includes all chromaticity ranges of daylight color, cool white, white, warm white, and incandescent color defined in JIS Z9112. The light source device according to any one of claims 1 to 3.

7. The light emission color region includes a chromaticity range with a lower correlated color temperature than the incandescent color. The light source device according to claim 6.

8. The first light emitting element is configured to emit the light radiated from the semiconductor element without wavelength conversion. The second light emitting element, the third light emitting element, and the fourth light emitting element are each configured to wavelength-convert and emit a part of the light radiated from the respective semiconductor elements. The light source device according to any one of claims 1 to 3.

9. The plurality of first light emitting elements and the plurality of fourth light emitting elements are arranged to be alternately arranged in a row along a first direction. The plurality of second light emitting elements and the plurality of third light emitting elements are arranged to be alternately arranged in a row along the first direction. The first light emitting element and the third light emitting element are arranged to be arranged side by side along a second direction intersecting the first direction. The second light emitting element and the fourth light emitting element are arranged to be arranged side by side along the second direction. The distance between the first light-emitting element and the third light-emitting element along the second direction and the distance between the second light-emitting element and the fourth light-emitting element along the second direction are narrower than the distance between the first light-emitting element and the fourth light-emitting element along the first direction and the distance between the second light-emitting element and the third light-emitting element along the first direction. The light source device according to any one of claims 1 to 3.

10. The first light-emitting element and the third light-emitting element and the second light-emitting element and the fourth light-emitting element alternately exchange their respective arrangements in the second direction along the first direction. The light source device according to claim 9.

11. The plurality of first light-emitting elements, the plurality of second light-emitting elements, the plurality of third light-emitting elements, and the plurality of fourth light-emitting elements are arranged in a row along the first direction, and the first light-emitting element and the second light-emitting element and the third light-emitting element and the fourth light-emitting element are arranged so as not to be adjacent to each other. The light source device according to claim 9.

12. The light source device according to any one of claims 1 to 3, A lighting device for lighting the light source device, comprising a lighting device.

13. The lighting device according to claim 12, a control device for controlling the lighting device, having a lighting system.

Images