lighting equipment

Abstract

To prevent a red color from becoming conspicuous at an edge part in an illumination device in which light sources of a plurality of colors including a red color are arranged in a row.SOLUTION: There is provided an illumination device 300 in which a plurality of LED packages 323 are arranged in a row, and a diffusion cover 324 is provided on the front face of the plurality of LED packages 323. The plurality of LED packages 323 include a red LED package, an LED package of a first color different from the red color, and an LED package of a second color different from the red color and the first color. A diffusion cover left edge face 324L extends on an installation face side from the left edge part of the diffusion cover 324, and a diffusion cover right edge face 324r extends on the installation face side from the right edge part of the diffusion cover 324. The LED package 323 disposed at a position the closest to the diffusion cover left edge face 324L is the LED package of the first color. The LED package 323 disposed at a position the closest to the diffusion cover right edge face 324r is the LED package of the first color.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a linear light source that mainly changes the color of LED lighting, and more particularly to a linear light source that uses three light sources of different colors. [Background technology]

[0002] With the spread of LED lighting using small LEDs, it has become easy to create color-tunable lighting devices that can freely change color by mixing two or three color LEDs. Color-tunable lighting devices can create light that matches the natural human biological rhythm by imitating the color changes of nature, such as the pale blue light of a blue sky in the daytime and the red light of a sunset in the evening, and are therefore thought to contribute to improving work efficiency, relaxation, and sleep quality, and ultimately to improving human health.

[0003] The most common method of adjusting color is to use two white light sources, one with a high color temperature and one with a low color temperature, and change the brightness ratio between them, but there are also examples of using three light sources, as shown below.

[0004] Figure 2 of Patent Document 1 shows an LED lighting device (hereinafter referred to as a straight tube LED) that replaces fluorescent lamps and has an array of RGB LED elements that emit red, green, and blue light, respectively. By providing a sealing material containing a diffusing agent inside the light-transmitting case, it is possible to mix the red, green, and blue colors and emit, for example, white light overall.

[0005] Patent Document 2 discloses a lighting device that includes a first group of LEDs using a phosphor, a second group of solid-state light emitters (blue), and a third group of solid-state light emitters (red), and that can adjust the brightness of the LEDs in the three groups to adjust the chromaticity coordinates surrounded by the LEDs in the three groups.

[0006] FIG. 7 of Patent Document 3 discloses a lighting device that adjusts the color within a chromaticity coordinate surrounded 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 Application Laid-Open No. 2010-97763 [Patent Document 2] Special Publication No. 2013-535084 [Patent Document 3] U.S. Patent No. 8,598,809 Summary of the Invention [Problem to be solved by the invention]

[0008] Using three colors of LEDs - red (R), white close to blue, and white close to yellow - we prototyped a linear light source in which the LEDs were repeatedly arranged in a row in an arrangement starting with R as described in Patent Document 1, and found that the red color was more noticeable at one end of the LED arrangement starting with R.

[0009] An object of the present invention is to prevent colors from becoming conspicuous at the ends of a linear light source that uses light sources of three colors. [Means for solving the problem]

[0010] The present invention provides a lighting device in which a plurality of LED packages are arranged in a row on an installation surface and a diffusion cover is provided on the front surface of the plurality of LED packages, the plurality of 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; a diffusion cover left end surface extending from a left end of the diffusion cover toward the installation surface, a diffusion cover right end surface extending from a right end of the diffusion cover toward the installation surface, the LED package disposed closest to the left end surface of the diffusion cover is the LED package of the first color, In the lighting device, the LED package disposed closest to the right end face of the diffusion cover is the LED package of the first color.

[0011] The present invention further provides a first set of LED packages, each of which is arranged in the order of the first color LED package, the red LED package, and the second color LED package from the position closest to the left end surface of the diffusion cover, and is repeatedly arranged; A second set in which the first color LED package, the red LED package, and the second color LED package are arranged in this order from the position closest to the right end surface of the diffusion cover is repeatedly arranged. 、 The first set and the second set have an arrangement of the first color LED package, the red LED package, the second color LED package, the red LED package, and the first color LED package. It may also be a lighting device.

[0012] The present invention further provides a third set of LED packages, each of which is arranged in the order of the first color LED package, the red LED package, the second color LED package, and the red LED package, from the position closest to the left end surface of the diffusion cover, and is repeatedly arranged; moreover The lighting device may be configured such that the LED package of the first color is disposed closest to the right end face of the diffusion cover. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a linear LED light source in which a color different from the overall emitted color at the end, particularly red, is not conspicuous. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is an external perspective view of a linear light source according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the linear light source according to the first embodiment. [Figure 3] 3 is a chromaticity diagram showing the color-tuning range of the linear light source according to the first embodiment. [Figure 4]This is a cross-sectional view of a linear light source to explain the relationship between LED arrangement and color unevenness. [Figure 5] This is a cross-sectional view of a linear light source to explain the relationship between LED arrangement and color unevenness. [Figure 6] 3 is a diagram illustrating the arrangement of LED packages in the linear light source of the first embodiment. [Figure 7] 10A and 10B are an external perspective view and a cross-sectional view of a linear light source according to a second embodiment. [Figure 8] FIG. 11 is an external perspective view of a linear light source according to a third embodiment. [Figure 9] FIG. 10 is a cross-sectional view of a linear light source according to a third embodiment. [Figure 10] FIG. 10 is a diagram illustrating the arrangement of LED packages in a linear light source according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] <Embodiment 1> <Basic configuration> The lighting device 300 according to this embodiment is a lighting device with a separated fixture body and linear light source. As shown in the external perspective view of FIG. 1, the lighting device has a fixture body 310 directly attached to the ceiling, and a linear light source 320 attached to the fixture body 310. Because the fixture body 310 and the linear light source 320 are separable, the screws or hanging bolts used to attach the fixture body 310 to the ceiling can be hidden by the linear light source 320. The lighting device has a width of 2 cm, for example, and a length of 120 cm, for example.

[0016] 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 includes a spring receiver 311 and a connector 312.

[0017] The linear light source 320 includes a mounting portion 321, a substrate 322, an LED package 323, a diffusion cover 324, a power supply 325, a control unit 326, a mounting spring 327, and a connector 328. The diffusion cover 324 has diffusion cover end faces (diffusion cover left end face 324L and diffusion cover right end face 324r). Since the diffusion cover end faces emit light, a plurality of linear light sources 320 can be arranged such that the diffusion cover end faces face each other, and the entire plurality of linear light sources 320 can be made into a continuous long light source.

[0018] The mounting spring 327 is attached to the spring receiver 311 of the instrument body 310, the connector 328 is connected to the connector 312 of the instrument body 310, and commercial power is supplied to the power supply 325. When distinguishing from the LED chip to be described later, "LED" may also be referred to as "LED package".

[0019] The power supply 325 converts commercial AC power into DC and has three-channel drive outputs so as 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 with an arbitrary chromaticity surrounded by the chromaticities of three LEDs.

[0020] <Chromaticity of LED> As the LED package 323 used in this embodiment, three types are used: a blue-white LED "Bw", a red LED "R", and a yellow-white LED "Yw". Note that although Yw is a color close to yellow on the chromaticity diagram, it also appears to be 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.

[0021] Bw, which is a cyan-white LED, emits light with chromaticities within the range enclosed 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).

[0022] R, which is a red LED, emits light with chromaticities within the range enclosed 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 this is not the same as the general definition of red.

[0023] Yw, which is a yellow-white LED, emits light with 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).

[0024] Among the chromaticity ranges of Yw, the line connecting the chromaticities of blackbody radiation at each color temperature is preferably within the range where d uv is positive, and it is particularly preferable that d uv is from +0.03 to 0.

[0025] Among the chromaticity ranges of Bw and R, the line connecting the chromaticities of blackbody radiation at each color temperature is particularly preferably within the range where d uv is from +0.03 to -0.03.

[0026] 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.

[0027] <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.

[0028] Fig. 4 shows a schematic cross-sectional view in the column direction, enlarging the left portion of the linear light source 320 shown in Fig. 2. Consider three color LEDs, A, B, and C (at this point, it is not yet decided which colors will be assigned to A, B, and C). Starting from the left end L, they are arranged as "A1, B1, C1, space, A2, B2, C2...". The distance between the LEDs in a pair, A1, B1, C1, etc., is W1, and the distance between the LEDs C2 and A3, with the space in between, is W2. The distance from the LED (LED package 323) to the inner surface of the diffusion cover 324 is d.

[0029] Consider point P1 (the center point of the diffuser cover) on the diffuser cover 324 in Figure 4(a). The diffuser cover 324 is located in front of LED package B3 (θ ≒ 0), a distance d from LED package B3. The ratio of d to W1 is set so that A3, B3, and C3 blend at point P1. By closely arranging the three LEDs (reducing W1), good color blending can be achieved at point P1 even with a relatively small d. The influence of each LED can be expressed by the "cosθ fourth power law," where θ is the angle between the normal to the LED and the line from the LED to point P1. This is because the distance r is d / cosθ, meaning that illuminance is the square of the distance; the influence of an obliquely irradiated surface is cosθ; and the light distribution characteristic of typical surface-mounted LEDs is a Lambertian light distribution, which is expressed as cosθ. Taking these factors into consideration, the influence of LEDs located far from P1 on color unevenness at point P1 can be virtually ignored.

[0030] Note that the above discussion is about the "internal illuminance" of the diffusion cover 324, and in reality it is necessary to consider the "external luminance" of the diffusion cover 324. If the diffusion cover is not completely diffusive and has a rectilinear component, the influence of oblique light on the external luminance of the diffusion cover is often smaller.

[0031] Set d so that good color mixing can be obtained even at point P2 (the point at the center of the diffuser cover), which is in the "empty" area in Figure 4(b). The inner illuminance at point P2 is heavily influenced by C2 and A3, and also by B2 and B3, with little influence from A2 and C3.

[0032] At point Q on the end of diffusion cover 324 near diffusion cover left end surface 324L in Figure 4(c), the influence of light other than A1, B1, and C1 on the right can be ignored, and the color of A1 stands out because it is closest to point Q. Note that the boundary between the center of the diffusion cover and the end of the diffusion cover is not clear, but as a rough guide, the area of ​​the diffusion cover to the left of A1, the leftmost LED in Figure 4(c), will be referred to as the "end of the diffusion cover."

[0033] At point R on the left end surface 324L of the diffusion cover in Figure 4(d), the influence of light other than A1, B1, and C1 on the right side can be ignored, and the color of A1 stands out because it is closest to point R. The diffusion cover end surface is the part that extends from the end of the diffusion cover toward the installation surface of the LED package, and in the embodiment, the parts 324L and 324r that extend perpendicular to the diffusion cover are just one example.

[0034] As described above, the theory behind the occurrence of color unevenness at the edges of a linear light source is simple; however, the color unevenness occurs in only a small area of ​​a long linear light source, and it is unavoidable that one of the colors A, B, or C will be noticeable at the edges unless the distance d is made larger than the size required for color mixing other than at the edges. Furthermore, there have not been many linear light sources equipped with diffusion cover edges, so it seems that making the colors at the edges less noticeable has not been seen as an issue until now.

[0035] <Conspicuous color at the edge and surface of the diffusion cover> In the present invention, attention is also paid to the fact that some LEDs used have conspicuous colors and others have relatively inconspicuous colors, and consideration is also given to which color LED is most suitable for placement at the end of the linear light source 320 used in this embodiment.

[0036] A visual comparison experiment was conducted on cyan-white LED (Bw), yellow-white LED (Yw), and red LED (R) at the ends. As conditions, the synthetic chromaticities were set to 1800K, 2800K, 5000K, and 6500K (all chromaticity points on blackbody radiation). As a result, it was found that when the red LED (R) was placed at the end, it was the most conspicuous in cases other than 1800K. The yellow-white LED (Yw) was the least conspicuous throughout the range. The cyan-white LED (Bw) was not conspicuous at 6500K and 1800K (however, at 1800K, the luminance of Bw was almost non-existent).

[0037] Considering that the chromaticity commonly used for lighting is in the range of 2800K to 5000K, the result was that Yw is suitable as the LED to be placed at the end, Bw is somewhat suitable, and R is not very suitable.

[0038] <LED Array> As shown in FIG. 5, three types of LED packages 323 are repeatedly arranged in a single row on the substrate 322.

[0039] 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·space·Yw·R·Bw·(omitted in the middle)·space·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 does not stand out at the end face of the diffusion cover.

[0040] The width of the 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.

[0041] The LED package arrangement can be a repeating arrangement of "Yw·R·Bw" with the "empty" spaces omitted, as shown in Figure 5(b), that is, "Yw·R·Bw·Yw·R·Bw·(omitted)·Yw·R·Bw" from the left end L to the right end r. Because each of the three LEDs generates heat, arranging them evenly is advantageous for heat dissipation.

[0042] Even in this arrangement, the LED closest to the left end L is a yellow-white LED (Yw), and the LED closest to the right end r is a bluish-white LED (Bw), neither of which is a red LED (R). Therefore, the red color does not stand out at the ends and edges of the diffusion cover.

[0043] As shown in Figure 6(a), the LED package arrangement is such that a set of three LEDs (Yw, R, Bw) (LC) is repeatedly arranged. For example, it can be folded back at the center fold line F, and a set of LEDs (r, ...

[0044] Here, when the sets LC and rC are folded at the folding line F, Bw and Bw are arranged on the left and right sides of the folding line F, respectively, and the color of the front diffusion cover surface becomes closer to Bw. To prevent this phenomenon, for example, the three LED packages on the right side of the folding line F can be grouped into a set FC of two "R·Yw". In that case, the LED package arrangement near the folding line F will be "Yw·R·Bw / R·Yw".

[0045] As shown in Fig. 6(b), the array of LED packages can be arranged such that the "gaps" between the sets of LC and the sets of rC are eliminated and the LED packages are evenly arranged. For example, it can be an array folded at the folding line F near the center.

[0046] As shown in Fig. 6(c), the array of LED packages can be arranged such that the set of LC of the left - hand side LEDs is "Yw·Bw·R" and the set of rC of the right - hand side LEDs is "R·Bw·Yw", and it is folded at the line F. In this arrangement, since Bw and R are adjacent, when both are lit, neither color stands out. Also, because the arrangement inside the set of LEDs is folded at the line F, the LEDs arranged at both ends can be Yw, and the colors of the diffusion cover ends and end faces can be made less prominent (if there is no folding, the right - hand end LED would be R). Note that in order to prevent the colors of the same LED packages from overlapping on both sides of the folding line F, the set of FC of the LEDs near the line F is composed of two LEDs "Bw·Yw".

[0047] As shown in Fig. 6(d), instead of repeating the set of three LEDs, the array can be the arrangement of the set of LC of four LEDs "Yw·R·Bw·R", with the left - hand end L being "Yw·R·Bw·R·Yw·R·Bw·(omitted in the middle)·Bw·R·Yw·R·Bw·R·Yw" and the right - hand end r. That is, in this array where Yw and Bw are arranged alternately with R placed between them, Yw is placed at both the left - hand end L and the right - hand end r. Therefore, the difference in color at the diffusion cover ends and end faces is less prominent. In this array, since the number of Rs increases, for example, the brightness of each R is adjusted to be 1 / 2 compared to the array in Fig. 6(a). Note that this arrangement can also be regarded as the arrangement of the set of rC of four LEDs "R·Bw·R·Yw" from the right.

[0048] <Structure of LED Package> The LED package used in the embodiment is a surface-mount type, and is approximately rectangular. 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 CSP (Chip Scale Package) packages with a width of approximately 1 mm are also available. The LED in the present invention is not limited to a surface-mount type LED package, and may be a bullet type or a COB (Chip On Board) type.

[0049] Bw has an InGaN blue LED chip placed at the bottom of a package, and an encapsulant containing green or yellow phosphor particles is enclosed within the package. Red phosphor particles may also be included.

[0050] Like Bw, Yw has an InGaN blue LED chip placed at the bottom of the package and an encapsulant containing green or yellow phosphor particles sealed inside the package, but the phosphor concentration is higher than Bw and it may also contain red phosphor particles.

[0051] For R, an AlGaInP LED chip is preferably placed at the bottom of the package and sealed with a transparent sealing material.

[0052] As with Yw and Bw, R may be an InGaN blue LED chip placed at the bottom of a package, with a sealant containing red phosphor particles sealed inside the package.

[0053] An LED package using an AlGaInP-based LED chip as R is preferable because it does not contain blue in the emission spectrum, but the drive voltage is different from that of Bw or Yw, making the drive circuit more complex. An LED package that combines a blue LED chip and red phosphor as R requires processing to reduce the blue in the emission spectrum. For example, it is preferable to increase the concentration of the red phosphor to reduce the proportion of light emitted from the blue LED chip to the outside, but a filter that absorbs blue may also be used.

[0054] In each of the above LED packages, the yellow phosphor particles are, for example, (Y 1-x Gd x )3AlO 12 :Ce 2+ (0≦x≦1), and for green phosphor particles, for example, Lu3Al5O 12 :Ce 2+ For example, Sr x Ca 1-x AlSiN3:Eu 3+ (0≦x≦1) Phosphor, Sr[LiAl3N4]:Eu 2+ and K2SiF6:Mn 4+ Phosphors can be preferably used, and quantum dots can also be preferably used.

[0055] <Diffusion cover> The diffusion cover is made of a translucent material that diffuses light, and is preferably made of polycarbonate, but acrylic resin may also be used. In this embodiment, the cross section of the diffusion cover is rectangular with the substrate side cut out.

[0056] <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 an appliance body installed on the ceiling, and commercial AC power can be received from the terminal.

[0057] 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.

[0058] <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.

[0059] <Embodiment 3> <Basic configuration> The lighting device 500 according to this embodiment is also a lighting device with a separable appliance body and linear light source. However, 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.

[0060] FIG. 8 shows a linear light source 520 combined with an appliance body 510 with a reflector called an inverted Fuji type directly attached to the ceiling. Since the appliance body 510 and the linear light source 520 are separable, screws or suspension bolts for attaching the appliance body 510 to the ceiling are hidden by the linear light source 520.

[0061] FIG. 9 shows a schematic cross-sectional view of the appliance body 510 and the linear light source 520 as seen from the left side of FIG. 8. The appliance body 510 is box-shaped with an open bottom surface and includes a spring receiver (not shown) and a connector (not shown).

[0062] The linear light source 520 includes a mounting portion 521, a substrate 522, an LED package 523, a diffusion cover 524, a left end surface 524L and a right end surface 524r of the diffusion cover (Fig. 8), a power supply 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 supply 525.

[0063] The power supply 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 supply 525, and the power supply 525 is controlled.

[0064] <LED array> As shown in Fig. 10, three types of LED packages 523 are repeatedly arranged in two rows on the substrate 522.

[0065] As shown in Fig. 10(a), for the arrangement of the LED packages, in the upper row of the figure (referred to as the first row), from the left end L, it is "Yw·R·Bw·empty·Yw·R·Bw·(omitted in the middle)·empty·Yw·R·Bw" to the right end r, and in the lower row of the figure (referred to as the second row), from the left end L, it is "Rw·R·Bw·empty·Rw·R·Bw·(omitted in the middle)·empty·Rw·R·Bw" 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 can further suppress the prominence of the color of Yw or Bw at one end face of the diffusion cover.

[0066] As shown in Fig. 10(b), the arrangement of the LED packages may also be an arrangement without spaces.

[0067] <Variation>

[0068] (1) Although the embodiments have been described with one or two rows of LEDs, three or more rows may be used.

[0069] (2) In the above example, three color LED packages are arranged in a row repeatedly in the same order at intervals W1, but the intervals W1 and W2 may be changed, for example, due to the convenience of screwing the board. Also, as already explained, it is not necessary to provide LED packages of all three colors near the folding line F. In other words, it is sufficient if there is at least a portion where the three color LED packages are arranged in a row repeatedly in the same order.

[0070] (3) Although the three-color LEDs described above are R, Yw, and Bw, other three-color LEDs may also be used. For example, R, Yw, and B (LEDs with chromaticity coordinates x≦0.2, y≦0.2) may be used, in which case Yw is most preferable as the LED at the end, and R should be avoided. Three-color LEDs of R, G (LEDs with chromaticity coordinates x≦0.35, y≧0.4), and B may also be used, in which case G is most preferable as the LED at the end, and R should be avoided. R, G, and Bw may also be used.

[0071] (4) As for the color-adjustable light source, we have explained that the brightness of the three LEDs can be arbitrarily set to obtain a color within the range bounded by the chromaticity of the three LEDs, but if there is a large degree of freedom in color selection, the user may be confused about which color to select, which can make it difficult to use. Therefore, it is possible to determine the intensity ratio of the LEDs to obtain specific emitted colors, such as "daylight color," "neutral white," "incandescent color," and "candle color," and then allow the user to display that color simply by selecting that color.

[0072] (5) The fixture body is available in ceiling-embedded and direct-mounted types, and the linear light source is available in narrow and wide types, which can be combined with each other. The fixture body shape is available in inverted Fuji type, reflector-mounted type, trough type, and wall washer type (a type in which one side of the trough type is shortened to illuminate the wall from above at an angle). ) Any variation may be used.

[0073] It should be noted that the above-described embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present invention should not be interpreted solely by the above-described embodiments, but should be defined by the claims. Furthermore, all modifications within the scope and meaning equivalent to the claims are included. [Explanation of symbols]

[0074] 310, 410, 510 fixture body 311 Spring holder 312 Connector 413 Socket 320, 420, 520 linear light source 321, 421, 521 mounting part 322, 422, 522 board 323, 423, 523 LEDs Bw Blue-white LED Yw Yellow-white LED R Red LED 324, 424, 524 diffusion cover 324L Diffusion cover left end 324r Right end of diffusion cover 325, 425, 525 power supply 326, 426 Control section 327 Mounting spring 328 Connector 429 terminal

Claims

1. A lighting device in which a plurality of LED packages are arranged in a row on an installation surface and a diffusion cover is provided on a front surface of the plurality of LED packages, the plurality of 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; a diffusion cover left end surface extending from a left end of the diffusion cover toward the installation surface, a diffusion cover right end surface extending from a right end of the diffusion cover toward the installation surface, a first set is arranged in which the first color LED package, the red LED package, and the second color LED package are arranged in this order from a position closest to a left end surface of the diffusion cover; a second set is arranged in which the first color LED package, the red LED package, and the second color LED package are arranged in this order from a position closest to a right end surface of the diffusion cover; Between the first set and the second set, an LED package of the first color, an LED package of the red color, an LED package of the second color, an LED package of the red color, and an LED package of the first color are arranged in order from the position closest to the first set. Lighting equipment.

2. A lighting device in which a plurality of LED packages are arranged in a row on an installation surface and a diffusion cover is provided in front of the plurality of LED packages, the plurality of 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; a diffusion cover left end surface extending from a left end of the diffusion cover toward the installation surface, a diffusion cover right end surface extending from a right end of the diffusion cover toward the installation surface, a third set in which the first color LED package, the red LED package, the second color LED package, and the red LED package are arranged in this order from the position closest to the left end face of the diffusion cover is repeatedly arranged, and further, a first color LED package is arranged at a position closest to the right end face of the diffusion cover; Lighting equipment.

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