JP6878911B2 - Lighting device - Google Patents

Description

The present invention relates to a lighting device.

Patent Document 1 describes a system that communicates using light. The system described in Patent Document 1 includes an LED as a light source. For example, the system comprises at least two LEDs, a red LED, a green LED or a blue LED, and communicates by changing the color of the light.

International Publication No. 2016/001972

White light can be obtained by using three color LEDs, namely red LED, green LED and blue LED. However, the white light obtained by using the red LED, the green LED and the blue LED has low color rendering properties. Therefore, in the system described in Patent Document 1, even if a three-color LED is provided as a light source, for example, sufficient color rendering properties cannot be obtained. When the system described in Patent Document 1 was used for lighting, the color of the irradiated object could not be reproduced accurately.

The present invention has been made to solve the above-mentioned problems. An object of the present invention is to provide a lighting device capable of realizing communication using light and obtaining high color rendering properties.

The lighting device according to the present invention includes a first red light emitting element and a second red light emitting element that emit red light, a first green light emitting element and a second green light emitting element that emit green light, and a second that emits blue light. 1 Blue light emitting element and 2nd blue light emitting element, red light emitted from 1st red light emitting element and 2nd red light emitting element, green light emitted from 1st green light emitting element and 2nd green light emitting element, and 1st A first control means for transmitting specific information by changing at least one of the blue light emitted from the blue light emitting element and the second blue light emitting element, and a first white light emitting element for emitting white light. A second white light emitting element and a second control means for adjusting the white light emitted from the first white light emitting element and the second white light emitting element are provided. Of the first red light emitting element, the first green light emitting element, the first blue light emitting element, and the first white light emitting element, the remaining three light emitting elements are the second red light emitting element, the second green light emitting element, and the like. It is arranged closer to the second blue light emitting element and the second white light emitting element. Of the second red light emitting element, the second green light emitting element, the second blue light emitting element, and the second white light emitting element, the remaining three light emitting elements are the first red light emitting element, the first green light emitting element, and the like. It is arranged closer to the first blue light emitting element and the first white light emitting element.

The lighting device according to the present invention emits at least one of red light emitted from the first light emitting element, green light emitted from the second light emitting element, and blue light emitted from the third light emitting element, for example. It includes a first control means for transmitting specific information by changing it, and a second control means for adjusting white light emitted from a fourth light emitting element. The lighting device according to the present invention can realize communication using light and can obtain high color rendering properties.

It is a figure which shows the use example of the lighting apparatus in Embodiment 1 of this invention. It is a figure which shows the example of a luminaire and a control unit. It is a figure which shows the example of RGB light radiated from a luminaire. It is a figure which shows the example of the white light radiated from a luminaire. It is a figure which shows the example of the whole light radiated from a luminaire. It is a figure which shows the example of RGB light, white light and whole light emitted from a luminaire. It is a figure which shows another example of the light radiated from a luminaire. It is a figure which shows another example of the light radiated from a luminaire. The exploded perspective view of the luminaire is shown. It is a figure which looked at the substrate and LED from the B direction shown in FIG. It is a figure which shows the arrangement example of LED and a lens. It is a figure which shows the comparative example of a lighting fixture. It is a figure which shows the appearance that the color crack occurred in the shadow part of the irradiated object. It is a figure which shows another example of a luminaire. It is a figure which shows another example of a luminaire. It is a figure which shows the use example of the lighting apparatus in Embodiment 2 of this invention. It is a figure which shows the example of the lighting equipment. It is an exploded perspective view of a lighting fixture. It is a figure which shows the arrangement example of a substrate and LED. It is a figure which shows the comparative example of a lighting fixture. It is a figure which shows the comparative example of a lighting fixture. It is a figure which shows the other comparative example of a luminaire. It is a figure which shows the other comparative example of a luminaire. It is a figure which shows the use example of the lighting apparatus in Embodiment 3 of this invention. It is a figure which shows the CC cross section of FIG. It is a figure which shows the arrangement example of a substrate and LED. It is a figure which shows the comparative example of a lighting fixture. It is a figure which shows the other comparative example of a luminaire. It is a figure which shows the other use example of the lighting apparatus in Embodiment 3 of this invention. It is a figure which shows the cross section of the luminaire shown in FIG. It is a figure which shows the comparative example of a lighting fixture. It is a figure which shows the other comparative example of a luminaire.

The present invention will be described with reference to the accompanying drawings. Overlapping description will be simplified or omitted as appropriate. In each figure, the same reference numerals indicate the same parts or corresponding parts.

Embodiment 1.
FIG. 1 is a diagram showing an example of using the lighting device according to the first embodiment of the present invention. The lighting device includes, for example, a lighting fixture 1 and a control unit 2. The control unit 2 includes a first control unit 2a and a second control unit 2b.

The luminaire 1 emits light. The luminaire 1 emits light, for example, to illuminate a specific object to be irradiated. The luminaire 1 may radiate light toward a specific space. FIG. 1 shows an example in which the luminaire 1 is used to illuminate the bag 3. The light emitted from the luminaire 1 hits the bag 3. A part of the light that hits the bag 3 is reflected by the bag 3. In FIG. 1, among the light reflected by the bag 3 from the lighting fixture 1, the light directed to the mobile terminal 4 is indicated by the arrow A.

FIG. 2 is a diagram showing an example of the lighting fixture 1 and the control unit 2. The luminaire 1 includes, for example, a plurality of LEDs (Light Emitting Diodes). In the example shown in FIG. 2, the luminaire 1 includes a plurality of red LEDs 5, a plurality of green LEDs 6, and a plurality of blue LEDs 7. The red LED 5 emits red light toward a specific area. The green LED 6 emits green light toward the specific area. The blue LED 7 emits blue light toward the specific region. In the example shown in FIG. 1, the bag 3 is placed in the specific area.

FIG. 2 shows an example in which a plurality of red LEDs 5 are connected in series. The red LEDs 5 may be connected in parallel. The luminaire 1 may have only one red LED 5. FIG. 2 shows an example in which a plurality of green LEDs 6 are connected in series. The green LEDs 6 may be connected in parallel. The luminaire 1 may have only one green LED 6. FIG. 2 shows an example in which a plurality of blue LEDs 7 are connected in series. The blue LEDs 7 may be connected in parallel. The luminaire 1 may have only one blue LED 7.

FIG. 3 is a diagram showing an example of RGB light emitted from the luminaire 1. FIG. 3 shows an example of red light emitted from the red LED 5, green light emitted from the green LED 6, and blue light emitted from the blue LED 7. FIG. 3 shows a spectrum of RGB light having a color temperature of about 5000 K. The exponent Ra of the spectrum shown in FIG. 3 is 18. Ra is one of the color rendering indexes indicating color reproducibility. In the following, the color rendering index is also referred to as the average color rendering index. FIG. 3 shows that the RGB light from the luminaire 1 alone is not suitable for lighting.

The first control unit 2a controls the red LED 5, the green LED 6, and the blue LED 7. For example, the first control unit 2a emits RGB light from the luminaire 1. The first control unit 2a emits red light from, for example, the red LED 5. The first control unit 2a emits green light from the green LED 6. The first control unit 2a emits blue light from the blue LED 7. The first control unit 2a can individually control the red LED 5, the green LED 6, and the blue LED 7.

The first control unit 2a adjusts the RGB light emitted from the luminaire 1. "Adjusting light" includes, for example, changing the intensity of light. "Adjusting the light" includes, for example, changing the color of the light. Any method may be adopted for adjusting the light. For example, amplitude control may be adopted to adjust the RGB light emitted from the luminaire 1. In amplitude control, the brightness is adjusted by controlling the direct current of the LED. Further, PWM (Pulse Width Modulation) control may be adopted to adjust the RGB light emitted from the luminaire 1. In PWM control, the LED is turned on and off at a constant frequency, and the brightness is adjusted by controlling the ratio of the on-time. The first control unit 2a adjusts, for example, the red light emitted from the red LED 5. The first control unit 2a adjusts the green light emitted from the green LED 6. The first control unit 2a adjusts the blue light emitted from the blue LED 7. The first control unit 2a can individually adjust the red light emitted from the red LED 5, the green light emitted from the green LED 6, and the blue light emitted from the blue LED 7.

The first control unit 2a causes the luminaire 1 to transmit specific information. The first control unit 2a causes, for example, transmit identification information from the lighting fixture 1. The identification information is information for identifying the lighting fixture 1. Unique identification information is assigned to the luminaire 1 in advance. The first control unit 2a changes the light of at least one of the red light emitted from the red LED 5, the green light emitted from the green LED 6, and the blue light emitted from the blue LED 7, for example, to change the lighting equipment. The identification information is transmitted from 1.

Any method may be used as a method of changing the light in order to transmit information from the luminaire 1. For example, the first control unit 2a changes the intensity of one color light or two color light of the red light emitted from the red LED 5, the green light emitted from the green LED 6, and the blue light emitted from the blue LED 7. By doing so, the identification information may be transmitted from the lighting fixture 1. The first control unit 2a may transmit identification information from the luminaire 1 by changing the intensity of RGB light while maintaining the control conditions for illuminating the light radiated from the luminaire 1. The "control condition as illumination" is, for example, at least one of dimming intensity, light color, and color temperature. For example, the first control unit 2a obtains identification information from the luminaire 1 by slightly changing the brightness of RGB light while keeping the color temperature of the light radiated from the luminaire 1 within a certain reference value or reference range. Send it. The "control condition as illumination" may be a luminous flux. For example, the first control unit 2a transmits identification information from the luminaire 1 by slightly changing the brightness of RGB light while keeping the luminous flux of the light radiated from the luminaire 1 within a certain reference value or reference range. You may let me. The first control unit 2a can individually adjust the radiant flux of red light radiated from the red LED 5, the radiant flux of green light radiated from the green LED 6, and the radiant flux of blue light radiated from the blue LED 7. Various visible light communication technologies can be applied to the transmission of the identification information.

In the example shown in FIG. 2, the luminaire 1 includes a plurality of white LEDs 8 in addition to the red LED 5, the green LED 6, and the blue LED 7. For example, the luminaire 1 includes the same number of red LEDs 5, green LEDs 6, blue LEDs 7, and white LEDs 8, respectively. The white LED 8 is provided because the red LED 5, the green LED 6, and the blue LED 7 alone cannot obtain sufficient color rendering properties for lighting. The white LED 8 emits white light toward the specific region. In the example shown in FIG. 1, red light from the red LED 5, green light from the green LED 6, and blue light from the blue LED 7 are emitted toward the region where the white light from the white LED 8 is emitted. That is, in the example shown in FIG. 1, the white light emitted from the white LED 8 hits the bag 3. FIG. 2 shows an example in which a plurality of white LEDs 8 are connected in series. The white LEDs 8 may be connected in parallel. The luminaire 1 may include only one white LED 8.

FIG. 4 is a diagram showing an example of white light radiated from the luminaire 1. FIG. 4 shows an example of white light emitted from the white LED 8. FIG. 4 shows a spectrum of white light having a color temperature of about 4000 K. The exponent Ra of the spectrum shown in FIG. 4 is 83. FIG. 4 shows that the white LED 8 alone has sufficient color rendering properties for lighting.

The second control unit 2b controls the white LED 8. The second control unit 2b can independently control the white LED 8 regardless of the control performed by the first control unit 2a. The second control unit 2b emits white light from, for example, the white LED 8. Further, the second control unit 2b adjusts the white light emitted from the white LED 8. For example, the second control unit 2b adjusts the radiant flux of white light emitted from the white LED 8. The white LED 8 is for lighting and is not used for visible light communication. That is, information such as identification information is not transmitted using the white LED 8.

The control unit 2 may include, for example, a controller and a power supply device (both not shown). The controller controls the power supply unit. The control of the luminaire 1 is performed by the controller controlling the power supply device. The controller and the power supply device may exist as independent devices and may be connected by a signal line. The controller and the power supply device may be an integrated device.

FIG. 5 is a diagram showing an example of the entire light emitted from the luminaire 1. FIG. 5 shows a spectrum obtained by mixing the spectrum shown in FIG. 3 and the spectrum shown in FIG. FIG. 5 shows an example in which the radiant flux of RGB light emitted from the luminaire 1 is about 5% of the radiant flux of the entire light. The radiant flux of RGB light is a radiant flux of red light emitted from the red LED 5, green light emitted from the green LED 6, and blue light emitted from the blue LED 7. The radiant flux of the entire light is a radiant flux of red light emitted from the red LED 5, green light emitted from the green LED 6, blue light emitted from the blue LED 7, and white light emitted from the white LED 8. The color temperature of the spectrum shown in FIG. 5 shifts only about + 40K from the color temperature of the spectrum shown in FIG. The exponent Ra of the spectrum shown in FIG. 5 is 86. The exponent Ra of the spectrum shown in FIG. 5 is larger than the exponent Ra of the spectrum shown in FIG. FIG. 5 shows that the use of luminaire 1 is suitable for lighting.

With this lighting device, it is possible to realize communication using light and obtain high color rendering properties. It is desirable that the radiant flux of light for communication is up to about 10% of the radiant flux of the entire light. If the radiant flux of RGB light emitted from the luminaire 1 is 5% to 10% of the radiant flux of the entire light, communication using light can be realized and high color rendering properties can be obtained. In addition, the amount of color temperature shift can be kept at a level where there is no problem in practical use. Specific calculation results are shown in Table 1 below. The detailed data required to obtain the results in Table 1 are shown in Table 2 below.

In this lighting device, the red light emitted from the red LED 5, the green light emitted from the green LED 6, and the blue light emitted from the blue LED 7 are individually adjusted by the control by the first control unit 2a. Further, the white light emitted from the white LED 8 is adjusted by the second control unit 2b regardless of the control of the first control unit 2a. Therefore, with this lighting device, it is possible to realize color reproducibility according to the user's preference.

For example, FIG. 6 is a diagram showing an example of RGB light, white light, and overall light emitted from the luminaire 1. FIG. 6 shows an example in which the radiant flux of RGB light emitted from the luminaire 1 is 5% of the total radiant flux of light. 7 and 8 are diagrams showing other examples of the light emitted from the luminaire 1. FIG. 7 shows an example in which red is emphasized. FIG. 8 shows an example in which blue is emphasized. Table 3 shows detailed data of the examples shown in FIGS. 6 to 8.

For example, when the user wants to make the red color of the irradiated object stand out, the output of the red light may be increased to increase the average color rendering index R9 as shown in FIG. When the user wants to make the blue color of the irradiated object stand out, the output of blue light may be increased to increase the average color rendering index R12 as shown in FIG. With this lighting device, as shown in FIGS. 7 and 8, color reproducibility according to the user's preference is suppressed while the fluctuation of the luminous flux and the shift amount of the correlated color temperature are suppressed to a level at which there is no practical problem. Can be realized. The above adjustment can be performed by changing the current flowing through the red LED 5, the green LED 6, and the blue LED 7. If a means capable of changing the current value flowing through the red LED 5, the green LED 6, and the blue LED 7 is prepared in advance, the user can make the above adjustment according to his / her preference after the luminaire 1 is installed. It is possible.

Next, a specific example of the lighting fixture 1 will be described. FIG. 9 shows an exploded perspective view of the luminaire 1. In the example shown in FIG. 9, the luminaire 1 includes three red LEDs 5, three green LEDs 6, three blue LEDs 7, and three white LEDs 8. In addition to the above 12 LEDs, the luminaire 1 includes, for example, a substrate 9, three lenses 10, a case 11, and a lens holder 12.

FIG. 10 is a view of the substrate 9 and the LED as viewed from the B direction shown in FIG. FIG. 11 is a diagram showing an arrangement example of the LED and the lens 10. In the example shown in FIGS. 9 to 11, one LED group is formed by one red LED 5, one green LED 6, one blue LED 7, and one white LED 8. 9 and 10 show an example in which the luminaire 1 includes three LED groups.

In the following description, when it is necessary to individually specify the LEDs provided in the luminaire 1, the letters a to c are added after each code as shown in FIGS. 9 and 10 to distinguish them. In the examples shown in FIGS. 9 and 10, the same alphabetic characters are attached to LEDs belonging to the same LED group. That is, the luminaire 1 includes red LEDs 5a to 5c, green LEDs 6a to 6c, blue LEDs 7a to 7c, and white LEDs 8a to 8c. The red LED 5a, the green LED 6a, the blue LED 7a and the white LED 8a belong to the LED group GA. The red LED 5b, the green LED 6b, the blue LED 7b and the white LED 8b belong to the LED group GB. The red LED 5c, the green LED 6c, the blue LED 7c and the white LED 8c belong to the LED group GC. Similarly, when it is necessary to individually specify the lens 10, the letters a to c are added after the reference numerals as shown in FIGS. 9 and 10 to distinguish the lenses 10.

The substrate 9 has, for example, a disk shape. The red LEDs 5a to 5c, the green LEDs 6a to 6c, the blue LEDs 7a to 7c, and the white LEDs 8a to 8c are provided on the substrate 9. The first control unit 2a controls the red LEDs 5a to 5c, the green LEDs 6a to 6c, and the blue LEDs 7a to 7c. The first control unit 2a changes at least one of the red light emitted from the red LEDs 5a to 5c, the green light emitted from the green LEDs 6a to 6c, and the blue light emitted from the blue LEDs 7a to 7c. Sends specific information. The first control unit 2a can individually adjust the red light emitted from the red LEDs 5a to 5c, the green light emitted from the green LEDs 6a to 6c, and the blue light emitted from the blue LEDs 7a to 7c. The second control unit 2b controls the white LEDs 8a to 8c. The second control unit 2b can adjust the white light emitted from the white LEDs 8a to 8c regardless of the control performed by the first control unit 2a.

LEDs belonging to the same LED group are collected and arranged in a specific area of the substrate 9 so as to function as one light emitting body in which color cracking does not occur in the luminaire 1. For example, the red LED 5a, the green LED 6a, the blue LED 7a, and the white LED 8a belonging to the LED group GA are centrally mounted in the first region of the substrate 9 so as to function as one light emitting body in the luminaire 1. Similarly, the red LED 5b, the green LED 6b, the blue LED 7b, and the white LED 8b belonging to the LED group GB are centrally mounted in the second region of the substrate 9 so as to function as one light emitting body in the luminaire 1. The red LED 5c, the green LED 6c, the blue LED 7c, and the white LED 8c belonging to the LED group GC are centrally mounted in the third region of the substrate 9 so as to function as one light emitting body in the luminaire 1.

In the LED group GA, the red LED 5a is adjacent to the blue LED 7a and the white LED 8a. The green LED 6a is adjacent to the blue LED 7a and the white LED 8a. The green LED 6a is arranged diagonally to the red LED 5a. With respect to the LEDs belonging to the LED group GA, the remaining LEDs are arranged closer to the LEDs belonging to the other LED groups. That is, the distance between the LEDs belonging to the LED group GA is shorter than the distance between the LEDs belonging to the LED group GA and the LEDs belonging to other LED groups.

For example, the green LED 6a is closer to the red LED 5a than the red LED 5b, the green LED 6b, the blue LED 7b, and the white LED 8b. Similarly, the blue LED 7a is closer to the red LED 5a than the red LED 5b, the green LED 6b, the blue LED 7b and the white LED 8b. The white LED 8a is closer to the red LED 5a than the red LED 5b, the green LED 6b, the blue LED 7b, and the white LED 8b. The same applies to the green LED 6a, the blue LED 7a, and the white LED 8a. For example, the blue LED 7a is closer to the white LED 8a than the red LED 5b, the green LED 6b, the blue LED 7b, and the white LED 8b.

In the LED group GB, the red LED 5b is adjacent to the blue LED 7b and the white LED 8b. The green LED 6b is adjacent to the blue LED 7b and the white LED 8b. The green LED 6b is arranged diagonally to the red LED 5b. With respect to the LEDs belonging to the LED group GB, the remaining LEDs are arranged closer to the LEDs belonging to the other LED groups. That is, the distance between the LEDs belonging to the LED group GB is shorter than the distance between the LEDs belonging to the LED group GB and the LEDs belonging to other LED groups.

For example, the green LED 6b is closer to the red LED 5b than the red LED 5a, the green LED 6a, the blue LED 7a, and the white LED 8a. Similarly, the blue LED 7b is closer to the red LED 5b than the red LED 5a, the green LED 6a, the blue LED 7a and the white LED 8a. The white LED 8b is closer to the red LED 5b than the red LED 5a, the green LED 6a, the blue LED 7a, and the white LED 8a. The same applies to the green LED 6b, the blue LED 7b, and the white LED 8b. For example, the blue LED 7b is closer to the white LED 8b than the red LED 5a, the green LED 6a, the blue LED 7a, and the white LED 8a.

The above is a description of the LED belonging to the LED group GA and the LED belonging to the LED group GB. The same can be said for the LED belonging to the LED group GB and the LED belonging to the LED group GC. The same can be said for the LED belonging to the LED group GC and the LED belonging to the LED group GA.

The red LED 5a, the green LED 6a, the blue LED 7a, and the white LED 8a belonging to the LED group GA face the lens 10a. The red light emitted from the red LED 5a enters the lens 10a and passes through the lens 10a. The green light emitted from the green LED 6a enters the lens 10a and passes through the lens 10a. The blue light emitted from the blue LED 7a enters the lens 10a and passes through the lens 10a. The white light emitted from the white LED 8a enters the lens 10a and passes through the lens 10a. The lens 10a emits a mixture of red light emitted from the red LED 5a, green light emitted from the green LED 6a, blue light emitted from the blue LED 7a, and white light emitted from the white LED 8a.

The red LED 5b, the green LED 6b, the blue LED 7b, and the white LED 8b belonging to the LED group GB face the lens 10b. The red light emitted from the red LED 5b enters the lens 10b and passes through the lens 10b. The green light emitted from the green LED 6b enters the lens 10b and passes through the lens 10b. The blue light emitted from the blue LED 7b enters the lens 10b and passes through the lens 10b. The white light emitted from the white LED 8b enters the lens 10b and passes through the lens 10b. The lens 10b emits a mixture of red light emitted from the red LED 5b, green light emitted from the green LED 6b, blue light emitted from the blue LED 7b, and white light emitted from the white LED 8b.

The red LED 5c, the green LED 6c, the blue LED 7c, and the white LED 8c belonging to the LED group GC face the lens 10c. The red light emitted from the red LED 5c enters the lens 10c and passes through the lens 10c. The green light emitted from the green LED 6c enters the lens 10c and passes through the lens 10c. The blue light emitted from the blue LED 7c enters the lens 10c and passes through the lens 10c. The white light emitted from the white LED 8c enters the lens 10c and passes through the lens 10c. The lens 10c emits a mixture of red light emitted from the red LED 5c, green light emitted from the green LED 6c, blue light emitted from the blue LED 7c, and white light emitted from the white LED 8c.

In the example shown in this embodiment, the lens 10 corresponds to the transmissive member described in the claims.

The substrate 9 is supported by the case 11. FIG. 9 shows an example in which the case 11 has a cylindrical shape. The case 11 is arranged so as to surround the red LED 5, the green LED 6, the blue LED 7, and the white LED 8. Further, the case 11 is arranged so as to surround the periphery of the substrate 9 and the lens 10. The lens retainer 12 is provided in, for example, the case 11. The lens 10 is positioned by the lens retainer 12.

In the example shown in this embodiment, one red LED 5, one green LED 6, one blue LED 7, and one white LED 8 are centrally arranged in one place so as to function as one light emitter. Will be done. The light emitted from the four LEDs is incident on one lens 10, and the light emitted from the lens 10 is a mixture of the lights emitted from the four LEDs. Therefore, it is possible to prevent color cracking from occurring in the shadow portion of the irradiated object.

FIG. 12 is a diagram showing a comparative example of a lighting fixture. FIG. 12 shows an unfavorable example of a luminaire. FIG. 12 corresponds to a view of a luminaire, which is a comparative example, as viewed from the B direction shown in FIG. In the example shown in FIG. 12 (a), the luminaire includes three sets of communication LED groups. Each communication LED group includes one red LED, one green LED and one blue LED. One lens is provided for one communication LED group. Further, in the example shown in FIG. 12A, 15 white LEDs are provided for illumination. One lens is provided for one white LED.

In the example shown in FIG. 12B, one red LED, one green LED, and one blue LED are provided for communication. One lens is provided for the red LED. One lens is provided for the green LED. One lens is provided for the blue LED. Further, in the example shown in FIG. 12B, 16 white LEDs are provided for lighting. One lens is provided for one white LED.

In the examples shown in FIGS. 12 (a) and 12 (b), the number of lenses increases and the luminaire becomes large. Further, in the example shown in FIG. 12B, the red light from the red LED, the green light from the green LED, and the blue light from the blue LED are not mixed and are emitted from the lighting fixture. Therefore, color cracking occurs in the shadow portion of the irradiated object. FIG. 13 is a diagram showing a state in which color cracking occurs in a shadow portion of the irradiated object. FIG. 13 shows an example in which light is applied to the irradiated object from the lighting fixture shown in FIG. 12 (b).

In the example shown in this embodiment with respect to the example shown in FIG. 12, one lens 10 is provided for one LED group. Therefore, the number of lenses 10 can be reduced, and the luminaire 1 can be miniaturized. Further, in the example shown in this embodiment, four LEDs belonging to one LED group function as one light emitting body. Therefore, it is possible to prevent color cracking from occurring in the shadow portion of the irradiated object.

14 and 15 are views showing another example of the luminaire 1. FIG. 14 is a diagram corresponding to FIG. FIG. 15 is a diagram corresponding to FIG. In the examples shown in FIGS. 14 and 15, the luminaire 1 includes three LED packages 13 as light sources. The LED package 13 corresponds to the LED group in the examples shown in FIGS. 9 to 11. In the following description, the differences from the examples shown in FIGS. 9 to 11 will be described in detail. The description of the same features as those shown in FIGS. 9 to 11 will be omitted as appropriate. Further, when it is necessary to individually specify the LED package 13 provided in the luminaire 1, as shown in FIG. 14, alphabetic characters a to c are added after each code to distinguish them.

Each LED package 13 includes one red LED 5, one green LED 6, one blue LED 7, and one white LED 8. For example, the LED package 13a includes a red LED 5a, a green LED 6a, a blue LED 7a, and a white LED 8a. The LED package 13b includes a red LED 5b, a green LED 6b, a blue LED 7b, and a white LED 8b. The LED package 13c includes a red LED 5c, a green LED 6c, a blue LED 7c, and a white LED 8c. In addition to the LED package 13, the luminaire 1 includes, for example, a substrate 9, three lenses 10, a case 11, and a lens holder 12.

The LED packages 13a to 13c are provided on the substrate 9. In the example shown in FIGS. 14 and 15, the first control unit 2a controls the red LEDs 5a to 5c, the green LEDs 6a to 6c, and the blue LEDs 7a to 7c. The first control unit 2a changes at least one of the red light emitted from the red LEDs 5a to 5c, the green light emitted from the green LEDs 6a to 6c, and the blue light emitted from the blue LEDs 7a to 7c. Sends specific information. The first control unit 2a can individually adjust the red light emitted from the red LEDs 5a to 5c, the green light emitted from the green LEDs 6a to 6c, and the blue light emitted from the blue LEDs 7a to 7c. The second control unit 2b controls the white LEDs 8a to 8c. The second control unit 2b can adjust the white light emitted from the white LEDs 8a to 8c regardless of the control performed by the first control unit 2a.

The LED package 13a faces the lens 10a. That is, the red LED 5a, the green LED 6a, the blue LED 7a, and the white LED 8a face the lens 10a. The LED package 13b faces the lens 10b. That is, the red LED 5b, the green LED 6b, the blue LED 7b, and the white LED 8b face the lens 10b. The LED package 13c faces the lens 10c. That is, the red LED 5c, the green LED 6c, the blue LED 7c, and the white LED 8c face the lens 10c.

The LED package 13a functions as one light emitter in the luminaire 1. For example, the red light emitted from the red LED 5a enters the lens 10a and passes through the lens 10a. The green light emitted from the green LED 6a enters the lens 10a and passes through the lens 10a. The blue light emitted from the blue LED 7a enters the lens 10a and passes through the lens 10a. The white light emitted from the white LED 8a enters the lens 10a and passes through the lens 10a. The lens 10a emits a mixture of red light emitted from the red LED 5a, green light emitted from the green LED 6a, blue light emitted from the blue LED 7a, and white light emitted from the white LED 8a.

Similarly, the LED package 13b functions as one light emitter in the luminaire 1. For example, the lens 10b emits a mixture of red light emitted from the red LED 5b, green light emitted from the green LED 6b, blue light emitted from the blue LED 7b, and white light emitted from the white LED 8b. Radiation. Further, the LED package 13c functions as one light emitting body in the luminaire 1. For example, the lens 10c emits a mixture of red light emitted from the red LED 5c, green light emitted from the green LED 6c, blue light emitted from the blue LED 7c, and white light emitted from the white LED 8c. Radiation.

Even in the examples shown in FIGS. 14 and 15, the same effects as those shown in the examples shown in FIGS. 9 to 11 can be obtained. That is, even in the examples shown in FIGS. 14 and 15, communication using light can be realized and high color rendering properties can be obtained. Further, the number of lenses 10 can be reduced, and the luminaire 1 can be miniaturized. Further, it is possible to prevent color cracking from occurring in the shadow portion of the irradiated object.

In the present embodiment, an example in which the luminaire 1 includes three LED groups or three LED packages 13 has been described. The number of LED groups or LED packages 13 included in the luminaire 1 may be increased or decreased from three according to the application of the luminaire 1. For example, when the number of LED groups included in the luminaire 1 is increased from three, the output of the luminaire 1 can be increased and the signal transmission range can be expanded.

Embodiment 2.
FIG. 16 is a diagram showing a usage example of the lighting device according to the second embodiment of the present invention. In the present embodiment, the differences from the example shown in the first embodiment will be described in detail. The description of the same features as those of the example shown in the first embodiment will be omitted as appropriate. The lighting device includes, for example, a lighting fixture 1 and a control unit 2. In the present embodiment, an example in which the lighting device includes the base type lighting fixture 1 will be described. The function of the control unit 2 is the same as the function disclosed in the first embodiment. For example, the control unit 2 includes a first control unit 2a and a second control unit 2b.

FIG. 17 is a diagram showing an example of the lighting fixture 1. FIG. 18 is an exploded perspective view of the luminaire 1. In the example shown in FIGS. 17 and 18, the luminaire 1 includes eight red LEDs 5, eight green LEDs 6, eight blue LEDs 7, and eight white LEDs 8. The luminaire 1 includes, for example, a substrate 9, a case 11, and a cover 14 in addition to the above 32 LEDs.

FIG. 19 is a diagram showing an arrangement example of the substrate 9 and the LED. Also in the example shown in this embodiment, one LED group is formed by one red LED 5, one green LED 6, one blue LED 7, and one white LED 8. FIG. 17 shows an example in which the luminaire 1 includes eight LED groups.

Also in the following description, when it is necessary to individually specify the LEDs provided in the luminaire 1, as shown in FIG. 18, letters a to h are added after each code to distinguish them. In the example shown in FIG. 18, the same alphabetic characters are attached to LEDs belonging to the same LED group. That is, the luminaire 1 includes red LEDs 5a to 5h, green LEDs 6a to 6h, blue LEDs 7a to 7h, and white LEDs 8a to 8h. The red LED 5a, the green LED 6a, the blue LED 7a and the white LED 8a belong to the LED group GA. The red LED 5b, the green LED 6b, the blue LED 7b and the white LED 8b belong to the LED group GB. Similarly, the red LED 5h, the green LED 6h, the blue LED 7h and the white LED 8h belong to the LED group GH.

The substrate 9 has, for example, a rectangular shape. The red LEDs 5a to 5h, the green LEDs 6a to 6h, the blue LEDs 7a to 7h, and the white LEDs 8a to 8h are provided on the substrate 9. The first control unit 2a controls the red LEDs 5a to 5h, the green LEDs 6a to 6h, and the blue LEDs 7a to 7h. The first control unit 2a changes at least one of the red light emitted from the red LEDs 5a to 5h, the green light emitted from the green LEDs 6a to 6h, and the blue light emitted from the blue LEDs 7a to 7h. Sends specific information. The first control unit 2a can individually adjust the red light emitted from the red LEDs 5a to 5h, the green light emitted from the green LEDs 6a to 6h, and the blue light emitted from the blue LEDs 7a to 7h. The second control unit 2b controls the white LEDs 8a to 8h. The second control unit 2b can adjust the white light emitted from the white LEDs 8a to 8h regardless of the control performed by the first control unit 2a.

LEDs belonging to the same LED group are collected and arranged in a specific area of the substrate 9 so as to function as one light emitting body in which color cracking does not occur in the luminaire 1. For example, the red LED 5a, the green LED 6a, the blue LED 7a, and the white LED 8a belonging to the LED group GA are centrally mounted in the first region of the substrate 9 so as to function as one light emitting body in the luminaire 1. The red LED 5b, the green LED 6b, the blue LED 7b, and the white LED 8b belonging to the LED group GB are centrally mounted in the second region of the substrate 9 so as to function as one light emitting body in the luminaire 1. Similarly, the red LED 5h, the green LED 6h, the blue LED 7h, and the white LED 8h belonging to the LED group GH are centrally mounted in the eighth region of the substrate 9 so as to function as one light emitting body in the luminaire 1. In the examples shown in FIGS. 17 to 19, since a plurality of LEDs belonging to the same LED group are arranged so as to function as one light emitting body in the lighting fixture 1, color cracking or uneven issuance occurs in the cover 14. Can be prevented. If the cover 14 is made of, for example, a milky white light-diffusing member, it is possible to further suppress the occurrence of color cracking in the shadow portion of the irradiated object.

In the LED group GA, the red LED 5a is adjacent to the blue LED 7a and the white LED 8a. The green LED 6a is adjacent to the blue LED 7a and the white LED 8a. The green LED 6a is arranged diagonally to the red LED 5a. With respect to the LEDs belonging to the LED group GA, the remaining LEDs are arranged closer to the LEDs belonging to the other LED groups. That is, the distance between the LEDs belonging to the LED group GA is shorter than the distance between the LEDs belonging to the LED group GA and the LEDs belonging to other LED groups.

Similarly, in the LED group GB, the red LED 5b is adjacent to the blue LED 7b and the white LED 8b. The green LED 6b is adjacent to the blue LED 7b and the white LED 8b. The green LED 6b is arranged diagonally to the red LED 5b. With respect to the LEDs belonging to the LED group GB, the remaining LEDs are arranged closer to the LEDs belonging to the other LED groups. That is, the distance between the LEDs belonging to the LED group GB is shorter than the distance between the LEDs belonging to the LED group GB and the LEDs belonging to other LED groups.

The same applies to other LED groups. For LEDs belonging to a certain LED group, the remaining LEDs are arranged closer to the LEDs belonging to another LED group. For example, the distance between the LEDs belonging to the LED group GH is shorter than the distance between the LEDs belonging to the LED group GH and the LEDs belonging to another LED group.

The substrate 9 is supported by the case 11. 17 and 18 show an example in which the case 11 is shaped like a base of a substrate 9. The cover 14 is provided on the case 11, for example. The cover 14 is arranged so as to cover the substrate 9. The cover 14 is transparent or translucent. The cover 14 has a function of diffusing, for example, transmitted light.

The red LED 5a, the green LED 6a, the blue LED 7a, and the white LED 8a belonging to the LED group GA face the cover 14. The red light emitted from the red LED 5a enters the cover 14 and passes through the cover 14. The green light emitted from the green LED 6a enters the cover 14 and passes through the cover 14. The blue light emitted from the blue LED 7a enters the cover 14 and passes through the cover 14. The white light emitted from the white LED 8a enters the cover 14 and passes through the cover 14. From the cover 14, a mixture of red light emitted from the red LED 5a, green light emitted from the green LED 6a, blue light emitted from the blue LED 7a, and white light emitted from the white LED 8a is emitted.

The red LED 5b, the green LED 6b, the blue LED 7b, and the white LED 8b belonging to the LED group GB face the cover 14. The red light emitted from the red LED 5b enters the cover 14 and passes through the cover 14. The green light emitted from the green LED 6b enters the cover 14 and passes through the cover 14. The blue light emitted from the blue LED 7b enters the cover 14 and passes through the cover 14. The white light emitted from the white LED 8b enters the cover 14 and passes through the cover 14. From the cover 14, a mixture of red light emitted from the red LED 5b, green light emitted from the green LED 6b, blue light emitted from the blue LED 7b, and white light emitted from the white LED 8b is emitted.

The same applies to other LED groups. For example, the red LED 5h, the green LED 6h, the blue LED 7h, and the white LED 8h belonging to the LED group GH face the cover 14. The red light emitted from the red LED 5h enters the cover 14 and passes through the cover 14. The green light emitted from the green LED 6h enters the cover 14 and passes through the cover 14. The blue light emitted from the blue LED 7h enters the cover 14 and passes through the cover 14. The white light radiated from the white LED 8h enters the cover 14 and passes through the cover 14. From the cover 14, a mixture of red light emitted from the red LED 5h, green light emitted from the green LED 6h, blue light emitted from the blue LED 7h, and white light emitted from the white LED 8h is emitted.

In the example shown in this embodiment, the cover 14 corresponds to the transmissive member described in the claims.

Even in the example shown in the present embodiment, the same effect as that of the example disclosed in the first embodiment can be obtained. For example, in the example shown in the present embodiment, communication using light can be realized and high color rendering properties can be obtained.

In the example shown in this embodiment, one red LED 5, one green LED 6, one blue LED 7, and one white LED 8 are centrally arranged in one place so as to function as one light emitter. Will be done. The light radiated from the four LEDs is incident on the cover 14, and the diffusive cover 14 radiates a mixture of the lights radiated from the four LEDs. Therefore, the cover 14 can further suppress the occurrence of color cracking in the shadow portion of the irradiated object.

20 and 21 are diagrams showing comparative examples of lighting fixtures. 20 and 21 show an unfavorable example of a luminaire. FIG. 20 is an exploded perspective view of the luminaire. In the example shown in FIGS. 20 and 21, the luminaire comprises three sets of communication LED groups. Each communication LED group includes one red LED, one green LED and one blue LED. Further, in the examples shown in FIGS. 20 and 21, six white LEDs are provided for illumination. The communication LED group and the white LED are arranged in a straight line at equal intervals. It is difficult to match the color of the light emitted from the communication LED group with the color of the light emitted from the white LED. Therefore, in the above-mentioned lighting equipment, white light emission unevenness or brightness unevenness occurs as shown in FIG.

22 and 23 are diagrams showing other comparative examples of lighting fixtures. 22 and 23 show an unfavorable example of a luminaire. FIG. 22 is an exploded perspective view of the luminaire. In the examples shown in FIGS. 22 and 23, one red LED, one green LED, and one blue LED are provided for communication. Further, in the examples shown in FIGS. 22 and 23, six white LEDs are provided for illumination. The nine LEDs are arranged in a straight line at equal intervals. In the above-mentioned lighting equipment, as shown in FIG. 23, light emission unevenness of each color occurs in a portion of the cover on which the communication LED faces.

In the example shown in this embodiment as opposed to the example shown in FIGS. 20 to 23, four LEDs belonging to one LED group function as one light emitting body. Therefore, it is possible to prevent color cracking or uneven light emission from occurring on the cover 14.

Also in the example shown in this embodiment, the luminaire 1 may include the LED package 13 as a light source. The LED package 13 includes, for example, one red LED 5, one green LED 6, one blue LED 7, and one white LED 8. The LED package 13 is provided on the substrate 9 so as to face the cover 14. When the LED package 13 is applied to the lighting fixture 1 shown in FIGS. 17 to 19, for example, eight LED packages 13 are arranged in a straight line at equal intervals.

Embodiment 3.
FIG. 24 is a diagram showing a usage example of the lighting device according to the third embodiment of the present invention. In the present embodiment, the differences from the example shown in the first embodiment will be described in detail. The description of the same items as those shown in the first embodiment will be omitted as appropriate. The lighting device includes, for example, a lighting fixture 1 and a control unit 2 (not shown in FIG. 24). In the present embodiment, an example in which the lighting device includes the guidance display board type lighting fixture 1 will be described. The function of the control unit 2 is the same as the function disclosed in the first embodiment. For example, the control unit 2 includes a first control unit 2a and a second control unit 2b.

FIG. 25 is a diagram showing a CC cross section of FIG. 24. In the example shown in FIGS. 24 and 25, the luminaire 1 includes 24 red LEDs 5, 24 green LEDs 6, 24 blue LEDs 7, and 24 white LEDs 8. In addition to the 96 LEDs described above, the luminaire 1 includes, for example, a substrate 9, a case 11, and a cover 14. FIG. 24 shows a state in which the cover 14 is removed from the case 11.

FIG. 26 is a diagram showing an arrangement example of the substrate 9 and the LED. Also in the example shown in this embodiment, one LED group is formed by one red LED 5, one green LED 6, one blue LED 7, and one white LED 8. FIG. 24 shows an example in which the luminaire 1 includes 24 LED groups.

Since the number of LEDs is large in the example shown in this embodiment, only the LEDs belonging to the LED group GA and the LEDs belonging to the LED group GB are distinguished from other LEDs by adding an alphabetic character after the code. For example, the red LED 5a, the green LED 6a, the blue LED 7a and the white LED 8a belong to the LED group GA. The red LED 5b, the green LED 6b, the blue LED 7b and the white LED 8b belong to the LED group GB.

The substrate 9 has, for example, a rectangular shape. The red LED 5, the green LED 6, the blue LED 7, and the white LED 8 are provided on the substrate 9. The first control unit 2a controls the red LED 5, the green LED 6, and the blue LED 7. The first control unit 2a changes specific information by changing at least one of the red light emitted from the red LED 5, the green light emitted from the green LED 6, and the blue light emitted from the blue LED 7. Send. The first control unit 2a can individually adjust the red light emitted from the red LED 5, the green light emitted from the green LED 6, and the blue light emitted from the blue LED 7. The second control unit 2b controls the white LED 8. The second control unit 2b can adjust the white light emitted from the white LED 8 regardless of the control performed by the first control unit 2a.

LEDs belonging to the same LED group are collected and arranged in a specific area of the substrate 9 so as to function as one light emitting body in which color cracking does not occur in the luminaire 1. For example, the red LED 5a, the green LED 6a, the blue LED 7a, and the white LED 8a belonging to the LED group GA are centrally mounted in the first region of the substrate 9 so as to function as one light emitting body in the luminaire 1. The red LED 5b, the green LED 6b, the blue LED 7b, and the white LED 8b belonging to the LED group GB are centrally mounted in the second region of the substrate 9 so as to function as one light emitting body in the luminaire 1.

In the LED group GA, the red LED 5a is adjacent to the blue LED 7a and the white LED 8a. The green LED 6a is adjacent to the blue LED 7a and the white LED 8a. The green LED 6a is arranged diagonally to the red LED 5a. With respect to the LEDs belonging to the LED group GA, the remaining LEDs are arranged closer to the LEDs belonging to the other LED groups. That is, the distance between the LEDs belonging to the LED group GA is shorter than the distance between the LEDs belonging to the LED group GA and the LEDs belonging to other LED groups.

In the LED group GB, the red LED 5b is adjacent to the blue LED 7b and the white LED 8b. The green LED 6b is adjacent to the blue LED 7b and the white LED 8b. The green LED 6b is arranged diagonally to the red LED 5b. With respect to the LEDs belonging to the LED group GB, the remaining LEDs are arranged closer to the LEDs belonging to the other LED groups. That is, the distance between the LEDs belonging to the LED group GB is shorter than the distance between the LEDs belonging to the LED group GB and the LEDs belonging to other LED groups.

The same applies to other LED groups. For LEDs belonging to a certain LED group, the remaining LEDs are arranged closer to the LEDs belonging to another LED group.

The substrate 9 is supported by the case 11. 24 and 25 show an example in which the case 11 has a box shape. The case 11 is arranged so as to surround the red LED 5, the green LED 6, the blue LED 7, and the white LED 8. Further, the case 11 is arranged so as to surround the periphery of the substrate 9. The cover 14 is provided on the case 11 so as to close the opening of the case 11, for example. The cover 14 is arranged so as to cover the substrate 9. The cover 14 is transparent or translucent. For example, characters and patterns for guidance are attached to the surface of the cover 14.

The red LED 5a, the green LED 6a, the blue LED 7a, and the white LED 8a belonging to the LED group GA face the cover 14. The red light emitted from the red LED 5a enters the cover 14 and passes through the cover 14. The green light emitted from the green LED 6a enters the cover 14 and passes through the cover 14. The blue light emitted from the blue LED 7a enters the cover 14 and passes through the cover 14. The white light emitted from the white LED 8a enters the cover 14 and passes through the cover 14. From the cover 14, a mixture of red light emitted from the red LED 5a, green light emitted from the green LED 6a, blue light emitted from the blue LED 7a, and white light emitted from the white LED 8a is emitted.

The red LED 5b, the green LED 6b, the blue LED 7b, and the white LED 8b belonging to the LED group GB face the cover 14. The red light emitted from the red LED 5b enters the cover 14 and passes through the cover 14. The green light emitted from the green LED 6b enters the cover 14 and passes through the cover 14. The blue light emitted from the blue LED 7b enters the cover 14 and passes through the cover 14. The white light emitted from the white LED 8b enters the cover 14 and passes through the cover 14. From the cover 14, a mixture of red light emitted from the red LED 5b, green light emitted from the green LED 6b, blue light emitted from the blue LED 7b, and white light emitted from the white LED 8b is emitted.

The same applies to other LED groups. The cover 14 emits a mixture of red light emitted from the red LED 5, green light emitted from the green LED 6, blue light emitted from the blue LED 7, and white light emitted from the white LED 8.

In the example shown in this embodiment, the cover 14 corresponds to the transmissive member described in the claims.

Even in the example shown in the present embodiment, the same effect as that of the example disclosed in the first embodiment can be obtained. For example, in the example shown in the present embodiment, the guidance display board type lighting device can be provided with a communication function using light.

In the example shown in this embodiment, one red LED 5, one green LED 6, one blue LED 7, and one white LED 8 are centrally arranged in one place so as to function as one light emitter. Will be done. The light emitted from the four LEDs is incident on the cover 14, and the light emitted from the cover 14 is a mixture of the lights emitted from the four LEDs. Therefore, it is possible to prevent color cracking or uneven light emission from occurring on the cover 14.

FIG. 27 is a diagram showing a comparative example of lighting equipment. FIG. 27 shows an unfavorable example of a luminaire. In the example shown in FIG. 27, the luminaire comprises two sets of communication LED groups. Each communication LED group includes one red LED, one green LED and one blue LED. Further, in the example shown in FIG. 27, 22 white LEDs are provided for lighting. The communication LED group and the white LED are arranged in a grid pattern at equal intervals. It is difficult to match the color of the light emitted from the communication LED group with the color of the light emitted from the white LED. Therefore, in the above-mentioned lighting equipment, white light emission unevenness or brightness unevenness occurs.

FIG. 28 is a diagram showing another comparative example of the lighting equipment. FIG. 28 shows an unfavorable example of a luminaire. In the example shown in FIG. 28, three red LEDs, three green LEDs and three blue LEDs are provided for communication. Further, in the example shown in FIG. 28, 24 white LEDs are provided for lighting. The 24 white LEDs are arranged in a grid pattern at equal intervals. The nine LEDs for communication are arranged between the white LEDs. In the above-mentioned lighting equipment, uneven light emission of each color occurs in the portion of the cover where the communication LEDs face each other.

In the example shown in this embodiment as opposed to the examples shown in FIGS. 27 and 28, four LEDs belonging to one LED group function as one light emitting body. Therefore, it is possible to prevent color cracking or uneven light emission from occurring on the cover 14.

Also in the examples shown in FIGS. 24 to 26, the luminaire 1 may include the LED package 13 as a light source. The LED package 13 includes, for example, one red LED 5, one green LED 6, one blue LED 7, and one white LED 8. The LED package 13 is provided on the substrate 9 so as to face the cover 14. When the LED package 13 is applied to the lighting fixture 1 shown in FIGS. 24 to 26, for example, 24 LED packages 13 are arranged in a grid pattern at equal intervals.

FIG. 29 is a diagram showing another use example of the lighting device according to the third embodiment of the present invention. The lighting device includes, for example, a lighting fixture 1 and a control unit 2 (not shown in FIG. 29). The function of the control unit 2 is the same as that of the above-mentioned example. FIG. 30 is a diagram showing a cross section of the luminaire 1 shown in FIG. 29. In the example shown in FIGS. 29 and 30, the luminaire 1 includes 9 red LEDs 5, 9 green LEDs 6, 9 blue LEDs 7 and 9 white LEDs 8. In addition to the 36 LEDs described above, the luminaire 1 includes, for example, a substrate 9, a case 11, a cover 14, and a reflective member 15.

The red LED 5, the green LED 6, the blue LED 7, and the white LED 8 are provided on the substrate 9. Also in the examples shown in FIGS. 29 and 30, one LED group is formed by one red LED 5, one green LED 6, one blue LED 7, and one white LED 8. FIG. 29 shows an example in which the luminaire 1 includes a group of nine LEDs. LEDs belonging to the same LED group are centrally mounted in a specific region of the substrate 9 so as to function as one light emitting body in which color cracking does not occur in the luminaire 1. In the examples shown in FIGS. 29 and 30, since a plurality of LEDs belonging to the same LED group are arranged so as to function as one light emitting body in the lighting fixture 1, color cracking or uneven issuance occurs in the cover 14. Can be prevented. If the cover 14 is made of, for example, a milky white light-diffusing member, it is possible to further suppress the occurrence of color cracking in the shadow portion of the irradiated object.

The substrate 9 is supported by the case 11. The reflective member 15 is supported by the case 11. The cover 14 is provided on the case 11 so as to close the opening of the case 11, for example. The cover 14 is arranged so as to cover the substrate 9 and the reflective member 15. The cover 14 is transparent or translucent. For example, characters and patterns for guidance are attached to the surface of the cover 14.

The reflective member 15 is obliquely opposed to the red LED 5, the green LED 6, the blue LED 7, and the white LED 8. The reflective member 15 is obliquely opposed to the cover 14. In each LED group, the red light emitted from the red LED 5 hits the reflecting member 15 and is reflected by the reflecting member 15. The red light from the red LED 5 reflected by the reflecting member 15 enters the cover 14 and passes through the cover 14. The green light emitted from the green LED 6 hits the reflecting member 15 and is reflected by the reflecting member 15. The green light from the green LED 6 reflected by the reflecting member 15 enters the cover 14 and passes through the cover 14. The blue light emitted from the blue LED 7 hits the reflecting member 15 and is reflected by the reflecting member 15. The blue light from the blue LED 7 reflected by the reflecting member 15 enters the cover 14 and passes through the cover 14. The white light radiated from the white LED 8 hits the reflecting member 15 and is reflected by the reflecting member 15. The white light from the white LED 8 reflected by the reflecting member 15 enters the cover 14 and passes through the cover 14. From the cover 14, the red light emitted from the red LED 5 reflected by the reflecting member 15, the green light emitted from the green LED 6 reflected by the reflecting member 15, the blue light emitted from the blue LED 7 reflected by the reflecting member 15, and the like. Light mixed with white light emitted from the white LED 8 reflected by the reflecting member 15 is emitted.

In the examples shown in FIGS. 29 and 30, the cover 14 corresponds to the transmissive member described in the claims.

Even in the examples shown in FIGS. 29 and 30, the same effects as those shown in the examples shown in FIGS. 24 to 26 can be obtained. For example, in the example shown in FIGS. 29 and 30, the guide display board type lighting device can be provided with a communication function using light.

In the examples shown in FIGS. 29 and 30, one red LED 5, one green LED 6, one blue LED 7, and one white LED 8 are concentrated in one place so as to function as one light emitter. Be placed. The light radiated from the four LEDs is reflected by the reflecting member 15 and then incident on the cover 14, and the cover 14 radiates a mixture of the lights radiated from the four LEDs. Therefore, it is possible to prevent color cracking or uneven light emission from occurring on the cover 14.

FIG. 31 is a diagram showing a comparative example of a lighting fixture. FIG. 31 shows an unfavorable example of a luminaire. In the example shown in FIG. 31, the luminaire includes three sets of communication LED groups. Each communication LED group includes one red LED, one green LED and one blue LED. Further, in the example shown in FIG. 31, six white LEDs are provided for lighting. The communication LED group and the white LED are arranged in a straight line at equal intervals. It is difficult to match the color of the light emitted from the communication LED group with the color of the light emitted from the white LED. Therefore, in the above-mentioned lighting equipment, white light emission unevenness or brightness unevenness occurs.

FIG. 32 is a diagram showing another comparative example of the lighting equipment. FIG. 32 shows an unfavorable example of a luminaire. In the example shown in FIG. 32, one red LED, one green LED, and one blue LED are provided for communication. Further, in the example shown in FIG. 32, six white LEDs are provided for lighting. The nine LEDs are arranged in a straight line at equal intervals. In the above-mentioned luminaire, uneven light emission of red, green and blue occurs on a part of the cover.

In the example shown in FIGS. 29 and 30, four LEDs belonging to one LED group function as one light emitting body as opposed to the example shown in FIGS. 31 and 32. Therefore, it is possible to prevent color cracking or uneven light emission from occurring on the cover 14.

Also in the examples shown in FIGS. 29 and 30, the luminaire 1 may include the LED package 13 as a light source. The LED package 13 includes, for example, one red LED 5, one green LED 6, one blue LED 7, and one white LED 8. The LED package 13 is provided on the substrate 9 so as to diagonally face the reflective member 15. When the LED package 13 is applied to the lighting fixture 1 shown in FIGS. 29 and 30, for example, nine LED packages 13 are arranged in a straight line at equal intervals.

In the first to third embodiments, an example in which the red LED5, the green LED6, and the blue LED7 are used for lighting and visible light communication has been described. The red LED5, the green LED6, and the blue LED7 may be used exclusively for visible light communication. In the first to third embodiments, an example in which the lighting fixture 1 includes an LED has been described. The luminaire 1 may include a light emitting element other than the LED. For example, the luminaire 1 may include a light emitting element such as an organic EL.

The control unit 2 includes a processing circuit including, for example, a processor and a memory as hardware resources. The control unit 2 realizes each function of the first control unit 2a and the second control unit 2b by executing the program stored in the memory by the processor. A part or all of each function of the control unit 2 may be realized by hardware.

1 Lighting equipment 2 Control unit 2a 1st control unit 2b 2nd control unit 3 Bag 4 Mobile terminal 5 Red LED
6 green LED
7 blue LED
8 white LED
9 Substrate 10 Lens 11 Case 12 Lens holder 13 LED package 14 Cover 15 Reflective member

Claims (2)

The first red light emitting element and the second red light emitting element that emit red light,
The first green light emitting element and the second green light emitting element that emit green light,
A first blue light emitting element and a second blue light emitting element that emit blue light,
The red light emitted from the first red light emitting element and the second red light emitting element, the green light emitted from the first green light emitting element and the second green light emitting element, and the first blue light emitting element and the second. A first control means for transmitting specific information by changing at least one of the blue light emitted from the blue light emitting element.
A first white light emitting element and a second white light emitting element that emit white light,
A second control means for adjusting the white light emitted from the first white light emitting element and the second white light emitting element, and
With
In any of the first red light emitting element, the first green light emitting element, the first blue light emitting element, and the first white light emitting element, the remaining three light emitting elements are the second red light emitting element, the said. It is arranged closer to the second green light emitting element, the second blue light emitting element, and the second white light emitting element.
In any of the second red light emitting element, the second green light emitting element, the second blue light emitting element, and the second white light emitting element, the remaining three light emitting elements are the first red light emitting element, the said. A lighting device arranged closer to the first green light emitting element, the first blue light emitting element, and the first white light emitting element. The first control means is a radiation bundle of red light emitted from the first red light emitting element and the second red light emitting element, and green light emitted from the first green light emitting element and the second green light emitting element. The lighting device according to claim 1 , wherein the radiation bundle and the radiation bundle of blue light emitted from the first blue light emitting element and the second blue light emitting element can be individually adjusted.

Images