Lighting device

Abstract

To prevent red from being conspicuous in an end part in an illuminating device in which light sources in a plurality of colors including red are arranged in rows.SOLUTION: In an illuminating device, LED packages in a plurality of colors are arranged in a plurality of rows including a first row and a second row between one end part and the other end part, and a diffusion cover is provided in front of the LED packages in the plurality of colors. The LED packages in the plurality of colors include an LED package in red, an LED package in a first color different from red, and an LED package in a second color different from red and the first color. In the first row, the LED package closest to the one end part is the LED package in the first color. In the second row, the LED package closest to the one end part is the LED package in the second color.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] This invention relates primarily to a linear light source that allows for variable color of LED lighting, and more particularly to a linear light source using three light sources of different colors. [Background technology]

[0002] With the widespread adoption of LED lighting using small LEDs, it has become easy to realize color-adjustable lighting devices that can freely change colors by mixing two or three colors of LEDs. Color-adjustable lighting devices can mimic the changes in colors in nature, such as the bluish-white light of a blue sky during the day and the red light of a sunset in the evening, creating light that matches the natural biological rhythms that humans inherently possess. It is believed that this can contribute to improving work efficiency, promoting relaxation, improving sleep quality, and ultimately improving human health.

[0003] While it is common practice to use two white light sources with high and low color temperatures and change the ratio of their brightness to achieve color toning, there are also examples that use three light sources, as shown below.

[0004] Figure 2 of Patent Document 1 describes a fluorescent lamp replacement LED lighting device (hereinafter referred to as a straight-tube LED) that arranges RGB LED elements that emit red, green, and blue light, respectively. It is stated that by providing a sealing material containing a diffusing agent inside a light-transmitting case, the red, green, and blue light can be mixed to emit, for example, white light as a whole.

[0005] Patent Document 2 discloses a lighting device that includes a first group of LEDs using phosphors, a second group of solid-state light-emitting materials (blue), and a third group of solid-state light-emitting materials (red), and that can dim the chromaticity coordinates enclosed by the three groups of LEDs by changing the brightness of the LEDs in the three groups.

[0006] Figure 7 of Patent Document 3 discloses a lighting device that adjusts the color within a chromaticity coordinate system enclosed by three color LEDs (BSY1, BSY2, R, where BSY stands for blue-shifted yellow). [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2010-97763 [Patent Document 2] Special Publication No. 2013-535084 [Patent Document 3] U.S. Patent No. 8598809 [Overview of the project] [Problems that the invention aims to solve]

[0008] Using three colors of LEDs—red (R), a bluish-white color, and a yellowish-white color—we prototyped a linear light source in which the LEDs were repeatedly arranged in a single row in the R-starting arrangement described in Patent Document 1. We found that the red color was particularly prominent at one end of the LED arrangement that began with R.

[0009] The present invention aims to prevent the color from being conspicuously visible at the ends of a linear light source using three colored light sources. [Means for solving the problem]

[0010] The present invention relates to a lighting device in which multiple LED packages of multiple colors are arranged in multiple rows, including a first row and a second row, between one end and the other end, and a diffusion cover is provided on the front of the multiple LED packages of multiple colors. The aforementioned multiple-color LED package includes a red LED package, an LED package of a first color different from red, and an LED package of a second color different from red and the first color. The first row consists of an LED package of the first color, an LED package of the red color, and an LED package of the second color.In the first row, the LED package located closest to one end is the LED package of the first color. Arranged to , The second row consists of the second color LED package, the red LED package, and the first color LED package. In the second row, the LED package located closest to one end is the LED package of the second color. They are arranged in such a way, In the first and second rows, the LED package located at the second position from one end is the red LED package That is the case.

[0011] The present invention relates to a lighting device in which multiple LED packages of multiple colors are arranged in multiple rows, including a first row and a second row, between one end and the other end, and a diffusion cover is provided on the front of the multiple LED packages of multiple colors. The aforementioned multiple color LED packages include a red LED package, an LED package of a first color different from red, and an LED package of a second color different from red and the first color. Combination , A diffusion cover end face is provided that extends from the end of the diffusion cover toward the mounting surface side of the plurality of LED packages. In the first row, the red LED package, the first color LED package, and the second LED package are arranged such that the LED package closest to the end face of the diffuser cover is the first color LED package. In the second row, the red LED package, the first color LED package, and the second LED package are arranged such that the LED package positioned closest to the end face of the diffuser cover is the second color LED package. , In the first and second columns, the LED package located at the second position from one end is the red LED package. It is a lighting device.

[0012] In the present invention, the LED package of the first color may be a yellow-white LED package having chromaticities within a range surrounded by (0.5, 0.5), (0.423, 0.355), (0.342, 0.312), (0.352, 0.44), (0.37, 0.63) and a chromaticity boundary line in the CIE1931 chromaticity coordinate system.

[0013] In the present invention, the LED package of the first color may be a blue-white LED package having chromaticities within a range surrounded by (0.336, 0.24), (0.352, 0.44), (0.15, 0.2), (0.2, 0.1) in the CIE1931 chromaticity coordinates.

[0014] In the present invention, the LED package of the first color may be a green LED package or a blue LED package.

[0015] In the present invention, the LED package of the first color may be a day-white LED package.

Effect of the Invention

[0016] According to the present invention, it is possible to provide an LED linear light source in which a color different from the overall emission color, particularly red, is not prominent at the ends.

Brief Description of the Drawings

[0017] [Figure 1] External perspective view of the linear light source of Embodiment 1. [Figure 2] Cross-sectional view of the linear light source of Embodiment 1. [Figure 3] Chromaticity diagram showing the color adjustment range in the linear light source of Embodiment 1. [Figure 4] Cross-sectional view of the linear light source for explaining the relationship between the LED arrangement and color unevenness. [Figure 5] Cross-sectional view of the linear light source for explaining the relationship between the LED arrangement and color unevenness. [Figure 6] Arrangement diagram of the LED packages in the linear light source of Embodiment 1. [Figure 7]External perspective view and cross-sectional view of the linear light source of Embodiment 2. [Figure 8] External perspective view of the linear light source of Embodiment 3. [Figure 9] Cross-sectional view of the linear light source of Embodiment 3. [Figure 10] Arrangement diagram of the LED package in the linear light source of Embodiment 3. [Modes for carrying out the invention]

[0018] <Embodiment 1> <Basic configuration> The lighting device 300 according to this embodiment is a fixture body and linear light source separated type lighting device. As shown in the external perspective view Figure 1, the fixture body 310 is directly attached to the ceiling, and the linear light source 320 is attached to the fixture body 310. Since the fixture body 310 and the linear light source 320 are separable, the screws or suspension bolts used to attach the fixture body 310 to the ceiling can be hidden by the linear light source 320. The width of the lighting device is 2 cm and the length is 120 cm, for example.

[0019] Figure 2 shows a cross-sectional view of the fixture body 310 and the linear light source 320. The fixture body 310 is box-shaped with an open bottom and is equipped with a spring receiver 311 and a connector 312.

[0020] The linear light source 320 comprises a mounting portion 321, a substrate 322, an LED package 323, a diffuser cover 324, a power supply 325, a control unit 326, a mounting spring 327, and a connector 328. The diffuser cover 324 has diffuser cover end faces (diffuser cover left end face 324L and diffuser cover right end face 324r). Since the diffuser cover end faces emit light, multiple linear light sources 320 can be arranged so that their diffuser cover end faces face each other, allowing the entire set of multiple linear light sources 320 to form a continuous, long light source.

[0021] The mounting spring 327 is attached to the spring receiver 311 of the appliance main body 310, the connector 328 is connected to the connector 312 of the appliance main body 310, and commercial power is supplied to the power supply 325. Note that when distinguishing from the LED chip described later, "LED" may be referred to as "LED package".

[0022] The power supply 325 converts commercial AC power into DC and has three-channel drive outputs to operate three types of LED packages. Each drive output can be controlled by an external control signal. In this embodiment, the control signal is transmitted wirelessly and received by the control unit 326. The control unit 326 sends the control signal to the power supply 325, and the power supply 325 is controlled. By independently controlling the three-channel drive outputs by the control signal, the linear light source 320 can emit light at an arbitrary chromaticity surrounded by the chromaticities of the three LEDs.

[0023] <Chromaticity of LED> As the LED packages 323 used in this embodiment, three types are used: blue-white LED "Bw", red LED "R", and yellow-white LED "Yw". Note that although Yw is a color close to yellow on the chromaticity diagram, it also appears as a color close to green when Bw and R are lit simultaneously. FIG. 3 is a chromaticity coordinate for explaining the chromaticities of these LEDs, and the line connecting the chromaticities of blackbody radiation at each color temperature is shown as a dotted line for reference.

[0024] Bw, which is a blue-white LED, emits light at a chromaticity within the range surrounded by (0.336, 0.24), (0.352, 0.44), (0.15, 0.2), and (0.2, 0.1) in the CIE1931 chromaticity coordinates of FIG. 3, and is, for example, (0.23, 0.26).

[0025] R, which is a red LED, emits light at a chromaticity within the range surrounded by (0.66, 0.23), (0.423, 0.355), (0.5, 0.5), and the chromaticity boundary line E in the chromaticity coordinates of FIG. 3, and is, for example, (0.60, 0.38). Note that it is not the same as the general definition of red.

[0026] Yw, which is a yellowish-white LED, emits light at chromaticities within the range enclosed by (0.5, 0.5), (0.423, 0.355), (0.342, 0.312), (0.352, 0.44), (0.37, 0.63) and the chromaticity boundary line E in the chromaticity coordinates of FIG. 3, and is, for example, (0.44, 0.47).

[0027] Among the chromaticity range of Yw, d from the line connecting the chromaticities of blackbody radiation at each color temperature is preferably within the positive range, and d uv is particularly preferably from +0.03 to 0.

[0028] Among the chromaticity ranges of Bw and R, d from the line connecting the chromaticities of blackbody radiation at each color temperature uv is particularly preferably within the range from +0.03 to -0.03.

[0029] Note that it can also be expressed in terms of the chromaticity coordinates (u', v') in CIE1976 instead of the chromaticity coordinates (x, y) in CIE1931, and the two can be mutually converted by the conversion formula u' = 4x / (-2x + 12y + 3), v' = 9y / (-2x + 12y + 3). It may also be expressed in other chromaticity coordinate systems.

[0030] <Reason for the color being prominent at the end of the LED array> Regarding the reason for the color being prominent at the end of the LED array, which is an object of the present invention, the following considerations were made.

[0031] FIG. 4 shows an enlarged cross-sectional schematic view in the column direction of the left side portion of the linear light source 320 shown in FIG. 2. Consider three-color LEDs A, B, and C (at this point, it is undetermined which color is assigned to each of A, B, and C). They are arranged as "A1·B1·C1·empty·A2·B2·C2····" from the left end L. Let the distance between the LEDs in a set such as A1·B1·C1 be W1, and the distance between the LEDs between C2 and A3 with an empty space be W2. Let the distance from the LED (LED package 323) to the inner surface of the diffusion cover 324 be d.

[0032] Consider point P1 (the point in the center of the diffuser cover) on the diffuser cover 324 in Figure 4(a). The diffuser cover 324 is located on the front surface (θ≒0) of the LED package B3, at a distance d from the LED package B3. At this point P1, the ratio of d to W1 is set so that A3, B3, and C3 are mixed. By placing the three LEDs close together (reducing W1), good color mixing can be obtained at point P1 even with a relatively small d. The effect of each LED can be expressed by the "fourth power law of cosθ", where θ is the angle between the LED normal and the line from the LED to point P1. This is because the distance r is d / cosθ and the illuminance is the square of the distance, the effect of the light being shone on an oblique surface is cosθ, and the light distribution characteristic of a typical surface-mount LED is a Lambertian light distribution represented by cosθ. Taking these factors into account, the effect of LEDs far from P1 on color unevenness at point P1 can be almost ignored.

[0033] It should be noted that the above discussion concerns the "internal illuminance" of the diffuser cover 324, and in practice, the "external luminance" of the diffuser cover 324 must also be considered. If the diffuser cover is not perfectly diffusive but has a directional component, the influence of oblique light on the external luminance of the diffuser cover is often less.

[0034] At point P2 (the point in the center of the diffuser cover), which is in the "empty space" in Figure 4(b), d is set so that good color mixing can be obtained. In the internal illuminance of point P2, C2 and A3 have a large influence, and B2 and B3 also have an influence, while A2 and C3 have a small influence.

[0035] At point Q on the end of diffuser cover 324, near the left end surface 324L of the diffuser cover in Figure 4(c), the influence of light other than A1, B1, and C1 on the right can be ignored, and since A1 is closest to point Q, the color of A1 becomes more prominent. Although the boundary between the center of the diffuser cover and the end of the diffuser cover is not clear, as a general guideline, the area of ​​the diffuser cover to the left of directly above A1, the leftmost LED in Figure 4(c), will be referred to as the "end of the diffuser cover."

[0036] At point R on the left end face 324L of the diffuser cover in Figure 4(d), the influence of light other than A1, B1, and C1 on the right can be ignored, and since A1 is closest to point R, the color of A1 becomes more prominent. The diffuser cover end face is the portion that extends from the end of the diffuser cover toward the mounting surface of the LED package, and in this embodiment, the portions 324L and 324r that extend perpendicular to the diffuser cover are just one example.

[0037] As described above, the principle behind the occurrence of color unevenness at the edges of linear light sources is simple, but since it is a color unevenness that occurs in only a small area of ​​a long linear light source, and because it is unavoidable that one of the colors A, B, or C will be more prominent at the edges unless the distance d is made larger than the size required for color mixing outside the edges, and furthermore, because there have been few linear light sources equipped with a diffuser cover edge, it seems that the issue of making the edge color less prominent has not been considered until now.

[0038] In this invention, we also take into consideration that even among the LEDs used, there are noticeable colors and relatively inconspicuous colors, and we have investigated which color LED is most suitable to place at the ends of the linear light source 320 used in this embodiment.

[0039] A visual comparison experiment was conducted using blue-white LEDs (Bw), yellow-white LEDs (Yw), and red LEDs (R) placed at the edges of a field. The conditions used were composite chromaticity at 1800K, 2800K, 5000K, and 6500K (all chromaticity points on blackbody radiation). The results showed that, except for 1800K, the red LED (R) was the most conspicuous when placed at the edges. The yellow-white LED (Yw) was the least conspicuous across the entire range. The blue-white LED (Bw) was not conspicuous at 6500K and 1800K (however, at 1800K, the brightness of Bw was almost nonexistent).

[0040] Considering that the chromaticity commonly used in lighting is in the range of 2800K to 5000K, the result is that Yw is suitable as the LED to be arranged at the end, Bw is somewhat suitable, and R is not very suitable.

[0041] <LED Array> As shown in FIG. 5, three types of LED packages 323 are repeatedly arranged in a row on the substrate 322.

[0042] As shown in FIG. 5(a), the arrangement of the LED packages is such that the three LEDs in the LED set are repeatedly arranged in the same order "Yw·R·Bw", that is, from the left end L, "Yw·R·Bw·empty·Yw·R·Bw·(omitted in the middle)·empty·Yw·R·Bw" to the right end r. In this arrangement, the LED closest to the left end L is Yw, and the LED closest to the right end r is Bw, and neither is R. Therefore, red color is not prominent at the end face of the diffusion cover.

[0043] The width of the empty space is preferably about 1 to 5 package widths, and more preferably 1.5 to 3 package widths. When the three LEDs are arranged close to each other in this way, as described above using FIG. 4(a), good color mixing can be obtained at point P1 even if d is relatively small.

[0044] As shown in FIG. 5(b), the arrangement of the LED packages may be a repeated arrangement of "Yw·R·Bw" omitting "empty", that is, from the left end L, "Yw·R·Bw·Yw·R·Bw·(omitted in the middle)·Yw·R·Bw" to the right end r. Since the three LEDs each generate heat, it is more advantageous for heat dissipation to arrange them evenly.

[0045] Also in this arrangement, the LED closest to the left end L is the yellow-white LED (Yw), and the LED closest to the right end r is the blue-white LED (Bw), and neither is the red LED (R). Therefore, red color is not prominent at the end face of the diffusion cover.

[0046] The LED package arrangement, as shown in Figure 6(a), may consist of repeating sets of three LEDs, "Yw·R·Bw" (LC), which can be folded back at the central fold line F, and repeated in the reverse order of sets of LEDs, "Bw·R·Yw" (rC), i.e., starting from the left end L, it can be "Yw·R·Bw·empty·Yw·R·Bw·(omitted)·Bw·R·Yw·empty·Bw·R·Yw" and ending at the right end r. In this arrangement, Yw is placed at both the left end L and the right end r. This is because Yw is a color that includes the chromaticity of blackbody radiation in the range of warm white (2800K) to cool white (5000K), which is the most commonly used color, and is close to white, so the difference in color between the center and the ends of the diffuser cover is less noticeable. Note that the position of the fold line F does not have to be near the center.

[0047] Here, when the LC and rC sets are folded back along the fold line F, Bw and Bw are arranged on the left and right sides of the fold line F, respectively, and the color of the diffuser cover surface in front of them becomes close to Bw. To prevent this phenomenon, for example, the three LED packages on the right side of the fold line F may be changed to a set FC with two "R·Yw" packages. In that case, the LED package arrangement near the fold line F will be "Yw·R·Bw / R·Yw".

[0048] The arrangement of the LED packages can be as shown in Figure 6(b), where the LED packages are evenly distributed by eliminating the "gaps" between sets of LC and sets of rC, and the arrangement can be folded back, for example, at a folding line F near the center.

[0049] The arrangement of the LED packages may be such that, as shown in Fig. 6(c), the left LED set LC is "Yw·Bw·R", the right LED set rC is "R·Bw·Yw", and it is folded back by line F. In this arrangement, since Bw and R are adjacent, there is an advantage that neither color stands out when both are lit. Also, since the arrangement inside the LED set is folded back by line F, the LEDs arranged at both ends can be Yw, and the color of the diffusion cover end face can be made inconspicuous (if there is no folding, the right-end LED would be R). In order to prevent the colors of the same LED packages from overlapping on both sides of the folding line F, the LED set FC near the line F is composed of two LEDs "Bw·Yw".

[0050] As shown in Fig. 6(d), the arrangement of the LED packages may be made as an arrangement of a set LC of four LEDs "Yw·R·Bw·R" instead of repeating the set of three LEDs. That is, from the left end L, it may be "Yw·R·Bw·R·Yw·R·Bw·(omitted in the middle)·Bw·R·Yw·R·Bw·R·Yw" and the right end r. That is, in this arrangement where Yw and Bw are arranged alternately and R is arranged between them, Yw is arranged at both the left end L and the right end r. Therefore, the difference in color at the diffusion cover end face is less conspicuous. In this arrangement, since the number of Rs increases, for example, the brightness of each R is adjusted to be 1 / 2 compared to the arrangement in Fig. 6(a). This arrangement can also be regarded as an arrangement of a set rC of four LEDs "R·Bw·R·Yw" from the right.

[0051] <Structure of LED Package> The LED package used in this embodiment is a surface-mount type and is roughly rectangular in shape. It has at least an anode electrode and a cathode electrode connected to the LED chip on its bottom surface, and these electrodes can be connected to a printed circuit board. LED packages with widths of 3 mm, 5 mm, and 7 mm are commercially available, and a type called CSP (Chip Scale Package) with a width of about 1 mm is also available. Note that the LED in this invention is not limited to a surface-mount LED package, but may also be bullet-shaped, COB (Chip On Board) type, etc.

[0052] Bw is a package in which an InGaN-based blue LED chip is placed at the bottom of the package, and a encapsulating material containing green phosphor particles or yellow phosphor is sealed inside the package. It may also contain red phosphor particles.

[0053] Similar to Bw, Yw has an InGaN-based blue LED chip placed at the bottom of the package, and a encapsulant containing green or yellow phosphor particles is sealed inside the package, but the phosphor concentration is higher than in Bw. It may also contain red phosphor particles.

[0054] For R, a suitable configuration is one in which an AlGaInP-based LED chip is placed at the bottom of the package and sealed with a transparent encapsulant.

[0055] Furthermore, R may also be a component similar to Yw and Bw, in which an InGaN-based blue LED chip is placed at the bottom of the package, and a sealing material containing red phosphor particles is enclosed inside the package.

[0056] When the LED package uses an AlGaInP-based LED chip as R, it is preferable in that the emission spectrum does not include blue, but since the drive voltages of Bw and Yw are different, the drive circuit becomes complicated. In the case of an LED package combining a blue LED chip and a red phosphor as R, a process for reducing the blue included in the emission spectrum is required. For example, it is preferable to increase the concentration of the red phosphor to reduce the ratio of the light from the blue LED chip radiated to the outside, but a filter that absorbs blue may also be used.

[0057] In each of the above LED packages, as the yellow phosphor particles, for example, (Y 1-x Gd x )3Al5O 12 :Ce 2+ (0 ≦ x ≦ 1) is used as the green phosphor particles, for example, Lu3Al5O 12 :Ce 2+ is used as the red phosphor, for example, Sr x Ca 1-x AlSiN3:Eu 3+ (0 ≦ x ≦ 1) phosphor, Sr[LiAl3N4]:Eu 2+ or K2SiF6:Mn 4+ phosphor can be preferably used. Quantum dots can also be preferably used.

[0058] <Diffusion cover> The diffusion cover is made of a translucent material having light diffusibility. As the material, for example, polycarbonate is preferable, but an acrylic resin may also be used. In the present embodiment, the cross-sectional shape of the diffusion cover is a rectangle with a missing substrate side.

[0059] <Embodiment 2> <Basic configuration> The linear light source 420 according to this embodiment is a straight tube LED. As shown in FIG. 7(a) which is a perspective view and FIG. 7(b) which is a cross-sectional view, it includes a terminal 429, a mounting portion 421, a substrate 422, an LED package 423, a diffusion cover 424, a power supply 425, and a control unit 426. Three LED packages 423 are repeatedly arranged in a row on the substrate 422. The terminal 429 is connected to a socket (not shown) of the fixture body installed on the ceiling, and commercial AC power can be received from the terminal.

[0060] The power supply 425 converts commercial AC power into DC and has three-channel drive outputs to operate three types of LED packages. Each drive output can be controlled by an external control signal. In this embodiment, the control signal is transmitted wirelessly and received by the control unit 426. The control unit 426 sends the control signal to the power supply 425, and the power supply 425 is controlled.

[0061] <LED Array> In this embodiment, LED packages 423 are mounted in a row on the substrate 422, and the array form is the same as that described in FIG. 6 of Embodiment 1.

[0062] <Embodiment 3> <Basic Configuration> The lighting device 500 according to this embodiment is also a fixture body - linear light source separable lighting device, but compared with Embodiment 1, the width of the linear light source is wider. Therefore, two rows of LEDs are arranged in the linear light source.

[0063] FIG. 8 shows a linear light source 520 combined with a fixture body 510 with a reflector called an inverted Fuji shape directly attached to the ceiling. Since the fixture body 510 and the linear light source 520 are separable, the screws or suspension bolts for attaching the fixture body 510 to the ceiling are hidden by the linear light source 520.

[0064] FIG. 9 shows a schematic cross-sectional view of the fixture body 510 and the linear light source 520 as seen from the left side of FIG. 8. The fixture body 510 is box-shaped with an open bottom surface and includes a spring receiver (not shown) and a connector (not shown).

[0065] The linear light source 520 includes a mounting part 521, a substrate 522, an LED package 523, a diffusion cover 524, a left end face 524L and a right end face 524R (FIG. 8) of the diffusion cover, a power source 525, a control unit (not shown), a mounting spring (not shown), and a connector (not shown). The mounting spring is attached to the spring receiver of the appliance body 510, the connector on the linear light source side is connected to the connector on the appliance body side, and commercial power is supplied to the power source 525.

[0066] The power source 525 converts commercial AC power into DC and has three-channel drive outputs to operate three types of LED packages. Each drive output can be controlled by an external control signal. In this embodiment, the control signal is transmitted wirelessly and received by the control unit. The control unit sends the control signal to the power source 525, and the power source 525 is controlled.

[0067] <LED Array> As shown in FIG. 10, three types of LED packages 523 are repeatedly arranged in two rows on the substrate 522.

[0068] As shown in FIG. 10(a), in the arrangement of the LED packages, the upper row (referred to as the first row) in the figure has "Yw·R·Bw·empty·Yw·R·Bw·(omitted in the middle)·empty·Yw·R·Bw" from the left end L to the right end R, and the lower row (referred to as the second row) in the figure has "Rw·R·Bw·empty·Rw·R·Bw·(omitted in the middle)·empty·Rw·R·Bw" from the left end L to the right end R. In this arrangement, above the left end L is Yw, and below the left end L is Bw, and neither is R. By using both Yw and Bw as the LEDs arranged at one end in this way, not only is the color of R less prominent, but it is further possible to suppress the prominence of the color of Yw or Bw on one end face of the diffusion cover.

[0069] As shown in FIG. 10(b), the arrangement of the LED packages may be an arrangement without gaps.

[0070] <Variation>

[0071] (1) While embodiments with one or two rows of LEDs have been described, there may be three or more rows.

[0072] (2) The example described shows three LED packages of the same color arranged in a repeating row with spacing W1, but the spacing W1 and W2 may change, for example, due to the screw fastening of the circuit board. Also, as already explained, it is not necessary to have all three LED packages near the folding line F. In other words, it is sufficient to have at least a portion where the three LED packages of the same color are arranged in a repeating row.

[0073] (3) The example of R, Yw, and Bw was used for the three-color LEDs, but other three-color LEDs may also be used. For example, R, Yw, and B (LEDs with chromaticity coordinates x ≤ 0.2 and y ≤ 0.2) may be used, in which case Yw is most preferred as the end LED and R should be avoided. R, G (LEDs with chromaticity coordinates x ≤ 0.35 and y ≥ 0.4) and B may also be used, in which case G is most preferred as the end LED and R should be avoided. R, G, and Bw may also be used.

[0074] (4) As a color-tunable light source, it was explained that the brightness of three LEDs can be arbitrarily set to obtain a color within the range enclosed by the chromaticity of the three LEDs. However, if there is too much freedom in color selection, users may be confused about which color to choose, making it difficult to use. Therefore, for example, the intensity ratio of the LEDs that can obtain a specific emission color such as "daylight," "neutral white," "incandescent color," or "candlelight color" may be defined, and the user can simply select that color to display it.

[0075] (5) The fixture body can be recessed into the ceiling or mounted directly to the ceiling, and the linear light source can be narrow or wide, and these can be combined with each other. Variations in the shape of the fixture body can also be used, such as inverted V-shape, reflector-type, trough-type, and wall washer-type (a type in which one side of the trough type is shortened to illuminate the wall from diagonally above).

[0076] Furthermore, the embodiments disclosed herein are illustrative in all respects and do not constitute a limiting interpretation. Therefore, the technical scope of the present invention is not construed solely by the embodiments described above, but is defined based on the claims. This also includes all modifications within the meaning and scope of the equivalents of the claims. [Explanation of Symbols]

[0077] 310, 410, 510 main unit of the device 311 Spring support 312 connector 413 Socket 320, 420, 520 linear light source 321, 421, 521 Mounting parts 322, 422, 522 circuit boards 323, 423, 523 LED Bw Blue-white LED Yw Yellow-white LED R Red LED 324, 424, 524 Diffusion Cover 324L Diffusion cover left end face 324r Diffusion cover right end face 325, 425, 525 power supply 326, 426 Control Unit 327 Mounting spring 328 connector 429 terminals

Claims

1. A lighting device in which multiple LED packages of multiple colors are arranged in multiple rows, including a first row and a second row, between one end and the other, and a diffusion cover is provided on the front of the multiple LED packages of multiple colors, The aforementioned plurality of colored LED packages include a red LED package, an LED package of a first color different from red, and an LED package of a second color different from red and the first color. In the first and second rows, a set consisting of the red LED package, the first color LED package, and the second color LED package is positioned on the side closest to one end, such that the LED package furthest from the one end of the set is separated from the other LED packages by at least one package width. In the first row, the LED package located closest to one end is an LED package of the first color. In the second row, the LED package located closest to one end is the LED package of the second color. A lighting device in which, in the first and second rows, the LED package located at the second position from one end is the red LED package.

2. A lighting device in which multiple LED packages of multiple colors are arranged in multiple rows, including a first row and a second row, between one end and the other, and a diffusion cover is provided on the front of the multiple LED packages of multiple colors, The aforementioned LED package of multiple colors consists of a red LED package, an LED package of a first color different from red, and an LED package of a second color different from both red and the first color. A diffusion cover end face is provided that extends from the end of the diffusion cover toward the mounting surface side of the plurality of LED packages. In the first and second rows, a set consisting of the red LED package, the first color LED package, and the second color LED package is positioned on the side closest to one end, such that the LED package furthest from the one end of the set is separated from the other LED packages by at least one package width. The first row is arranged such that the LED package located closest to the end face of the diffuser cover is an LED package of the first color. The second row is arranged such that the LED package located closest to the end face of the diffuser cover is the LED package of the second color. A lighting device in which, in the first and second rows, the LED package located at the second position from one end is the red LED package.

3. The first color LED package is a yellow-white LED package whose chromaticity is within the range enclosed by (0.5, 0.5), (0.423, 0.355), (0.342, 0.312), (0.352, 0.44), (0.37, 0.63) and the chromaticity boundary line in the CIE 1931 chromaticity coordinate system. The lighting device according to claim 1 or 2.

4. The first color LED package is a blue-white LED package whose chromaticity is within the range enclosed by (0.336, 0.24), (0.352, 0.44), (0.15, 0.2), and (0.2, 0.1) in the CIE 1931 chromaticity coordinate system. The lighting device according to claim 1 or 2.

5. The first color LED package is either a green LED package or a blue LED package. The lighting device according to claim 1 or 2.

6. The aforementioned first color LED package is a daylight white LED package. The lighting device according to claim 1 or 2.

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