JP2022156357A - Led module, illumination apparatus, and illumination structure - Google Patents

Abstract

To provide an LED module in which LEDs are unlikely influenced by heat and color nonuniformity is prevented as far as possible from occurring in illumination light, and an illumination apparatus with the LED module.SOLUTION: An LED module 1 constituting an illumination apparatus is configured by disposing a plurality of LEDs including a plurality of full color LEDs 2 and a plurality of white LEDs 3 in a row on a substrate 4 and configured by disposing a plurality of LED groups in each of which three white LEDs 3 are disposed adjacently to one full color LED 2, in a row. An inter-center distance A between the full color LED 2 and the white LED 3 which are adjacent to each other in the same LED group is set longer than an inter-center distance B between the white LEDs 3 in both ends in the three white LEDs in the same LED group. An inter-center distance between the full color LED2 and the white LED3 which are adjacent in the adjacent LED groups is equal to the distance A.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to an LED module, a lighting device equipped with the LED module, and a lighting structure.

An LED module is known in which a plurality of LEDs are arranged in a row on a substrate. For example, Patent Literature 1 discloses an LED module having a configuration in which a plurality of groups of LEDs, in which a red LED, a green LED, and a blue LED are arranged in this order between a pair of white LEDs, are arranged in a row. In order to reduce color unevenness of illumination light, this LED module has a center-to-center distance (2N) between one white LED and its adjacent red LED in the same LED group, and the other white LED and its adjacent blue LED. The center-to-center distance (2N) from the LEDs is shorter than the center-to-center distance (2L) between adjacent white LEDs in the adjacent LED group. That is, the color unevenness is reduced by bringing the colored LEDs (red LEDs and blue LEDs) closer to the white LEDs in the LED group.

Japanese Patent No. 6558672

The inventors of the present application have developed an LED module in which a plurality of LEDs including a plurality of full-color LEDs and a plurality of white LEDs are arranged in a row on a substrate. During this development, we encountered the following problems. That is, since the full-color LED has elements of RGB three colors in one chip, it generates more heat than the white LED. Therefore, the white LEDs and the full-color LEDs need to be arranged so that they are not easily affected by each other's heat. On the other hand, it is necessary to arrange these LEDs so that the illumination light has as little color unevenness as possible, and it is difficult to achieve both.

An object of the present invention is to provide an LED module in which LEDs are not easily affected by heat and in which color unevenness in illumination light is minimized, an illumination device including the LED module, and an illumination structure.

The LED module of the present invention is an LED module in which a plurality of LEDs including a plurality of full-color LEDs and a plurality of white LEDs are arranged in a row on a substrate, and a plurality of white LEDs are arranged next to one full-color LED. The arranged LED groups are arranged in a row in a plurality of groups, and the center-to-center distance between the adjacent full-color LEDs and the white LEDs in the same LED group is the distance between the white LEDs at both ends of the plurality in the same LED group. It is characterized by being longer than the center-to-center distance.

A lighting device according to the present invention includes the above-described LED module and a housing that accommodates the LED module.

A lighting structure according to the present invention includes the lighting device described above and a reflecting surface for reflecting light from the lighting device, and the lighting device is used as indirect lighting.

Advantageous Effects of Invention According to the present invention, it is possible to provide an LED module in which LEDs are not easily affected by heat and in which color unevenness in illumination light is minimized, an illumination device including the LED module, and an illumination structure.

It is a figure showing typically the lighting installation provided with the LED module concerning one Embodiment of this invention. FIG. 2 is a diagram showing an installation example of the lighting device of FIG. 1; 3 is a diagram showing another installation example of the lighting device of FIG. 1; FIG. FIG. 2 is a schematic diagram of the LED module of FIG. 1; 5 is an enlarged view of the main part of FIG. 4; FIG. It is a schematic diagram of the LED module of a comparative example. It is a graph showing the luminance value of the illuminating device of FIG. 1 and the illuminating device of a comparative example, and is a graph at the time of making each illuminating device light a light bulb color. It is a graph showing the luminance value of the illuminating device of FIG. 1 and the illuminating device of a comparative example, and is a graph at the time of making each illuminating device light-emit red. It is a graph showing the luminance value of the illuminating device of FIG. 1 and the illuminating device of a comparative example, and is a graph at the time of making each illuminating device emit light in green. It is a graph showing the luminance value of the illuminating device of FIG. 1 and the illuminating device of a comparative example, and is a graph at the time of making each illuminating device light-emit blue.

An “LED module”, “illumination device” and “illumination structure” according to one embodiment of the present invention will be described with reference to FIGS.

A lighting device 10 shown in FIG. 1 includes an LED module 1 , a housing 9 housing the LED module 1 , and a transparent cover attached to an opening 9 a of the housing 9 .

The LED module 1, which is schematically shown, is composed of a plurality of LEDs including a plurality of full-color LEDs and a plurality of white LEDs arranged in a row on a long and narrow substrate in the longitudinal direction of the substrate. Four LED modules 1 having a length of about 30 cm are used in the illumination device 10 of this example, and the respective LED modules 1 are arranged in the longitudinal direction.

The transparent cover allows the light from the LED module 1 to pass therethrough, and is attached with a light diffusion sheet. Thus, it is preferable to provide a diffusion layer such as a light diffusion sheet on the transparent cover to increase the light distribution angle. By doing so, it is possible to further reduce the color unevenness of the illumination light.

The illumination device 10 of this example is intended to be used as an interior lamp of a railway vehicle. Further, as shown in FIG. 2, the lighting device 10 is installed obliquely upward so that its longitudinal direction (the direction in which the LEDs are arranged) is in the traveling direction of the vehicle 11 and that the light hits the ceiling 12. It is intended to be used as lighting.

That is, the lighting structure shown in FIG. 2 is composed of a lighting device 10 used as indirect lighting and a ceiling 12 as a reflecting surface for reflecting the light from the lighting device 10 . In addition, the ceiling 12 is a light diffusion surface (not a mirror surface, but a surface that diffuses and reflects incident light) so as to further reduce color unevenness of the illumination light. By using the illumination device 10 as indirect illumination in this manner, the light is mixed on the illuminated surface, resulting in a more uniform color. In this example, the lighting device 10 is provided with a light diffusion sheet, and the ceiling 12 is a light diffusion surface. and at least one of the light diffusion surface.

Note that, as shown in FIG. 3, the lighting device 10 may be installed facing downward so that the light directly hits the seat 14 and the floor 13 . That is, the illumination device 10 can also be used as direct illumination.

Next, the element arrangement of the LED module 1 will be described. As shown in FIG. 4 , the LED module 1 is configured by arranging a plurality of LEDs including a plurality of full-color LEDs 2 and a plurality of white LEDs 3 in a row on a substrate 4 . As shown in FIG. 5, the plurality of full-color LEDs 2 are those in which RGB three-color elements 2r, 2g, and 2b are incorporated in one chip. In this example, elements 2r, 2g, and 2b of three colors of RGB are arranged in this order in the direction in which the plurality of LEDs 2 and 3 are arranged.

The plurality of LEDs 2 and 3 are regularly arranged in the order of full-color LED 2, white LED 3, white LED 3, white LED 3, full-color LED 2, white LED 3, white LED 3, white LED 3, . That is, a plurality of groups of LEDs each having three white LEDs 3 arranged next to one full-color LED 2 are arranged in a row. A dashed-dotted line in FIG. 4 represents a unit of each LED group, and each LED group is composed of elements enclosed by the dashed-dotted line. In this example, ten LED groups are arranged on one substrate 4 . Therefore, in this example, the LED module 1 is composed of 10 full-color LEDs 2 and 30 white LEDs 3 .

The plurality of LEDs 2 and 3 are spaced apart from each other. The intervals are set as follows.

That is, the center-to-center distance A between the full-color LED 2 and the white LED 3 adjacent to each other in the same LED group is set longer than the center-to-center distance B between the white LEDs 3 at both ends of the three in the same LED group. The three white LEDs 3 in the same LED group are arranged at regular intervals. In addition, the center-to-center distance between adjacent full-color LEDs 2 and white LEDs 3 in adjacent LED groups is equal to the distance A described above. In this example, A=10.1834 mm and B=8.9834 mm.

As described in the section of the problem to be solved by the invention, the full-color LED 2 generates more heat than the white LED 3 because the three color elements 2r, 2g, and 2b of RGB are built in one chip. Therefore, in the present invention, as described above, the center-to-center distance A between the full-color LED 2 and the white LEDs 3 on both sides thereof is made longer than the center-to-center distance B between the white LEDs 3 on both ends of the three aligned full-color LEDs 2 . , and the white LED 3 are arranged so that they are not easily affected by heat.

The inventors of the present application installed the lighting device 10 on a mock-up of a vehicle, applied light to a wall surface, and evaluated color unevenness and luminance distribution on the wall surface. For comparison, a lighting device equipped with the LED module 301 shown in FIG. direction) and compared the two.

The LED module 301 of the comparative example shown in FIG. 6 is formed by alternately arranging white LEDs 3 and full-color LEDs 2 in a row on the substrate 4 (however, two white LEDs 3 are arranged in succession at three places on the way). is being used). This LED module 301 is composed of 26 full-color LEDs 2 and 30 white LEDs 3 .

Regarding the color unevenness evaluation, the lighting device 10 of the present invention and the lighting device of the comparative example emit light in incandescent color (only the white LED 3 is lit), red, green, and blue. was confirmed visually. As a result, it was confirmed that the lighting device 10 of the present invention was comparable in each color to the lighting device of the comparative example and had no color unevenness.

Regarding the luminance distribution evaluation, the lighting device 10 of the present invention and the lighting device of the comparative example emit light in incandescent color (only the white LED 3 is lit), red, green, and blue, and the luminance image of the wall surface is obtained in each color. and plotted the luminance value for each pixel position. 7 is a graph when light is emitted in incandescent color, FIG. 8 is a graph when light is emitted in red, FIG. 9 is a graph when light is emitted in green, and FIG. 10 is a graph when light is emitted in blue. It is a graph when The "pixel position" on the horizontal axis of each graph is the position in the horizontal direction of the wall surface, and is the position in the direction in which the lighting device 10 of the present invention and the lighting device of the comparative example are arranged. As is clear from these graphs, it was confirmed that the lighting device 10 of the present invention had a luminance distribution substantially equal to that of the lighting device of the comparative example in each color, and that there was no problem with luminance unevenness.

As described above, according to the present invention, an LED module 1 in which the LEDs 2 and 3 are not easily affected by heat and in which color unevenness in illumination light is minimized, a lighting device 10 including the LED module 1, and lighting structures.

In the above-described embodiment, each LED group of the LED module has a configuration in which three white LEDs 3 are arranged next to one full-color LED 2, but the present invention is not limited to this, and each LED group has one A configuration in which two white LEDs 3 are arranged next to a full-color LED 2 may be used, or a configuration in which three or more white LEDs 3 are arranged next to one full-color LED 2 may be used. In any case, the center-to-center distance between the full-color LED and the white LED adjacent to each other in the same LED group should be set longer than the center-to-center distance between the white LEDs at both ends among the plurality of white LEDs in the same LED group. Just do it.

In addition, the above-described embodiment merely shows a typical form of the present invention, and the present invention is not limited to the embodiment. That is, various modifications can be made without departing from the gist of the present invention.

1 LED module 2 full color LED
3 white LEDs
4 substrate 10 lighting device

Claims (5)

An LED module in which a plurality of LEDs including a plurality of full-color LEDs and a plurality of white LEDs are arranged in a row on a substrate,
LED groups in which a plurality of white LEDs are arranged next to one full-color LED are arranged in a row in a plurality of groups,
An LED module, wherein a center-to-center distance between a full-color LED and a white LED adjacent to each other in the same LED group is longer than a center-to-center distance between white LEDs at both ends of a plurality of the same LED group. An illumination device comprising: the LED module according to claim 1; and a housing housing the LED module. 3. The lighting device according to claim 2, further comprising a light diffusion sheet through which light from the LED modules is transmitted. A lighting device according to claim 2 or 3, and a reflecting surface that reflects light from the lighting device,
A lighting structure, wherein the lighting device is used as indirect lighting. 5. The lighting structure of Claim 4, wherein the reflective surface is a light diffusing surface.

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