JP2023175460A - Light source device for notification - Google Patents

Abstract

To provide a light source device for notification, capable of securing an appearance adopted to a leaf color.SOLUTION: In a light source device 3 for notification, when a color degree point of a reference light source is set to (U*0, V*0) in a color degree diagram of (U*, V*) corresponded to a color chip of a leaf color, the color degree point when the light source device for the notification is set to a sample light source is set to (U*1, and V*1), a length of a first line segment connecting an original point and the color degree point of the reference light source is set to L0, a length of second line segment connecting the original point and the color degree point of the sample light source is set to L1, an angle formed by the first line segment and the second segment is set to θ(°), and L0=((U*0)2+(V*0)2)1/2, L1=((U*1)2+(V*1)2)1/2, θ=(tan-1(V*1/U*1)-tan-1(V*0/U*0))×(180/π), and r=L1/L0 are satisfied, the following relation of -2.5≤θ≤4 and 0.9≤r≤1.25 is satisfied.SELECTED DRAWING: Figure 2

Description

The present invention relates to a notification light source device.

In recent years, the use of LEDs as various light sources has progressed, and various lighting devices using LEDs (LED lighting devices) have been proposed as light sources for illumination. Among these, LED lighting devices installed on the ceiling of a room are mainly used for base lighting (overall lighting) that illuminates the entire indoor space like a ceiling light, and for providing various information to people using the room. There is also notification lighting.

Patent Document 1 discloses a network system including a plurality of temperature sensors and a plurality of lights for illuminating the surroundings of each temperature sensor. In this network system, temperature-related information is reported by changing the color of the lighting according to the temperature detected by the temperature sensor. Patent Document 2 discloses base lighting that enables design of color rendering performance. In this base lighting, the chromaticity point of the light source is set to a predetermined condition based on the (U ^* , V ^* ) chromaticity diagram corresponding to the red color chart.

Patent No. 5624429 Patent No. 6128488

According to the lighting described in Patent Document 1, information regarding temperature can be reported. However, when the colors of a plurality of lights are changed depending on the temperature, disturbances may occur in the indoor color environment.

According to the base illumination described in Patent Document 2, it is possible to provide a visual appearance suitable for red, such as human skin. However, using this base illumination, it is not always possible to provide appropriate visibility for colors different from red. Furthermore, the conditions applied to this base illumination are not necessarily applicable to the notification light source device.

For example, in order to provide a relaxing space, plants or ornamental plants are sometimes placed indoors, but in order to provide a space that does not look unnatural in a room that is illuminated with signal light for notifications, planting It is necessary to ensure that the appearance is suitable for the color of leaves, which is the representative color of trees. Therefore, an object of the present invention is to provide a notification light source device that can ensure visibility suitable for the color of leaves on trees.

In order to achieve the above object, one aspect of the notification light source device according to the present invention is a notification light source device that emits light based on at least one of the internal conditions and external conditions of a space, In the ₍ ^{U *} , ^{V *} ) chromaticity diagram _{corresponding} to the color chart of The point is (U ^* ₁ , V ^* ₁ ), the length of the first line segment connecting the origin and the chromaticity point of the reference light source is _L0 , and the length of the first line segment connecting the origin and the chromaticity point of the sample light source is L0. The length of the two line segments is _L1 , the angle between the first line segment and the second line segment is θ (°),
L ₀ = ((U ^* ₀ ) ² + (V ^* ₀ ) ² ) ^1/2 ,
L ₁ = ((U ^* ₁ ) ² + (V ^* ₁ ) ² ) ^1/2 ,
θ = (tan ^-1 (V ^* ₁ / U ^* ₁ ) - tan ^-1 (V ^* ₀ / U ^* ₀ )) × (180/π),
When r=L ₁ /L ₀ ,
The following relationships are satisfied: -2.5≦θ≦4 and 0.9≦r≦1.25.

According to the present invention, it is possible to provide a notification light source device that can ensure visibility suitable for the color of leaves on trees.

1 is a diagram showing a notification light source device and a lighting system including the notification light source device according to an embodiment; FIG. It is a (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the color of the leaves of a tree. It is a figure which shows the 1st range in the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the leaf color of the light source device for notifications based on embodiment. It is a figure which shows the 2nd range in the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the leaf color of the light source device for notifications based on embodiment. It is a figure which shows the 3rd range in the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the leaf color of the light source device for notifications based on embodiment. FIG. 1 is a block diagram showing the configuration of a lighting system. FIG. 1 is a diagram showing the configuration of a notification light source device according to an embodiment. It is a figure showing the composition of the LED module concerning an embodiment. It is a figure which shows the structure of the LED module based on the modification of embodiment. FIG. 2 is a block diagram showing a functional configuration of a lighting system according to Modification 1. FIG. 7 is a block diagram showing a mechanical configuration of a lighting system according to modification 2. FIG.

(Findings that formed the basis of the present invention)
The findings that form the basis of the present invention will be explained with reference to FIGS. 1 to 5.

FIG. 1 is a diagram showing a notification light source device 3 and a lighting system 1 including the notification light source device 3 according to an embodiment.

As shown in FIG. 1, the lighting system 1 includes a plurality of base lighting devices 2 and a plurality of notification light source devices 3.

The base lighting device 2 is a lighting device that illuminates the entire indoor space, such as a ceiling light. The indoor space is set to provide a preferable lighting environment using the base lighting device 2.

The notification light source device 3 is a lighting device for notifying various information to people using the room. The various information includes information regarding temperature, air quality, etc., which will be described in detail later. Note that the plurality of base lighting devices 2 do not necessarily need to be included in the lighting system 1 as components of the lighting system 1.

The notification light source device 3 reports various information by irregularly changing the emission color and brightness of the signal light output from the notification light source device 3. The notification light source device 3 needs to output signal light so that people in the room can sufficiently recognize the signal light. On the other hand, if the signal light is made too conspicuous in order to make the signal light recognizable, there is a problem that the lighting environment suitably set by the base lighting device 2 will be disturbed. For example, in a work environment such as an office, if the signal light stands out too much, the indoor lighting environment may be disturbed and the work efficiency of the office worker may be reduced.

That is, it is desired that the signal light output from the notification light source device 3 is light that is not too conspicuous and does not feel unnatural to people. Therefore, in order to create a lighting environment in which people do not feel unnatural in a room where signal light is irradiated, the inventors of the present invention focused on the appearance of the color of tree leaves, which is the representative color of plants and ornamental plants. . Specifically, the chromaticity point used to derive the R14 value defined by JIS defines how a leaf-colored object will appear when signal light is irradiated with it. The reason why we focused on the appearance of the color of tree leaves is that the appearance of the color of tree leaves is important when providing a space that resembles a natural environment. This is because there is a strong correlation with how colors appear.

The way an object's color appears can be expressed as color rendering performance (color rendering properties). For evaluating the color rendering properties of illumination light sources, there is an index called average color rendering index Ra, and in addition, there is a special color rendering index R14 as an index indicating the fidelity of the appearance of the color of leaves. In this case, it is often thought that the higher the value of R14, the better the appearance of the color of the leaves on the trees. Therefore, it is considered possible to use the value of R14 to design a green-colored irradiated object so that it looks preferable.

However, the value of R14 only indicates the difference in appearance from the reference light source, and cannot determine the direction of color shift, that is, the direction and amount of changes in saturation, hue, and each other. For example, even if there are two types of sample light sources with R14=20, these two sample light sources will simply have the same color shift from the reference light source, and the color of the leaves on the trees will appear duller than the reference light source. In some cases, it may appear more vivid than the reference light source.

As a result of intensive study on these issues, the inventors of the present application determined that the range of the coordinate space should be defined using the (U ^* , V ^* ) coordinate system rather than R14 itself, thereby creating an appropriate way to view green color. We found that it is possible to define

Specifically, first, it was confirmed that the appearance of the color of leaves on trees is strongly related to the position on the chromaticity coordinates (U ^* , V ^* ). It was also revealed that even if the value of R14 is the same, the appearance of the color of the leaves may differ depending on the case. Based on this, when discussing the desirability of how the colors of leaves appear, the relative positional relationship between each test light color and the corresponding chromaticity coordinates (U ^* , V ^* ) of the reference light source is important. I discovered that.

(Summary of the present invention)
Hereinafter, with respect to the notification light source device 3, a method discovered by the inventors of the present invention to define an appropriate appearance of the color of the leaves will be described.

FIG. 2 is a (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the color of leaves on a tree. FIG. 2 shows a (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the color of the leaves of a tree for the notification light source device 3, which is one constituent unit.

As shown in Figure 2, for the chromaticity point on the (U ^* , V ^* ) chromaticity diagram that corresponds to the color chart of the leaf color (that is, the color chart used when calculating the R14 value), the chromaticity of the reference light source is The point is (U ^* ₀ , V ^* ₀ ), the chromaticity point when the notification light source device 3 is used as the sample light source (test light source) is (U ^* ₁ , V ^* ₁ ), and the origin 0 and the reference light source are The length of the first line segment LX connecting the chromaticity point (U ^* ₀ , V ^* ₀ ) (the distance from the origin of the chromaticity point of the reference light source) is _L0 , and the chromaticity point of the origin 0 and the sample light source is Let the length of the second line segment LY connecting (U ^* ₁ , V ^* ₁ ) (the distance from the origin of the chromaticity point of the sample light source) be L ₁ , and the first line segment X and the second line segment Y Let the angle formed by this be θ (°). In this case, L ₀ , L ₁ , θ, and r can be expressed by the following formulas.

L ₀ = ((U ^* ₀ ) ² + (V ^* ₀ ) ² ) ^1/2
L ₁ = ((U ^* ₁ ) ² + (V ^* ₁ ) ² ) ^1/2
θ = (tan ^-1 (V ^* ₁ / U ^* ₁ ) - tan ^-1 (V ^* ₀ / U ^* ₀ )) × (180/π),
r=L ₁ /L ₀

Here, the inverse function tan ⁻¹ α of tan is defined such that α satisfies “0≦α<π”. Generally, it is sometimes taken as "-π/2≦α<π/2," but in the case of this patent, the case where the possible chromaticity point is in the second quadrant of the (U ^* , V ^* ) coordinates is discussed. Therefore, it is more appropriate to define it as above.

Here, the coordinates in the (U ^* ,V ^* ) chromaticity diagram in Figure 2 are the U* value and ^{V* value} determined by the U ^* V ^* W ^* color space (CIE 1964 color space) defined by CIE in 1964. This is the one taken. Further, a specific calculation formula for calculating the corresponding (U ^* , V ^* ) coordinates from the spectral distribution of the light source is based on JIS Z8726. In addition, in the (U ^* , V ^* ) chromaticity diagram in Figure 2, the chromaticity point of the reference light source is the color rendering evaluation of the sample light source, assuming that the chromaticity point of the sample light source coincides with that point. This is the chromaticity point when the index R14 is 100. Note that the reference light source is a light source that has a spectral distribution that serves as a reference when evaluating the color rendering performance of the light source. For example, it is defined by JIS Z 8720 as a light bulb or a light source that simulates daylight.

When ^evaluating the color rendering performance of an illumination light source, it should be discussed in terms of "hue" and "saturation," which are the two elements of color ^appearance. ) Since the chromaticity of the sample light source can be defined by the chromaticity diagram, "hue" and "saturation" can be shown separately. In other words, it is not possible to quantitatively evaluate "hue" and "saturation" individually using only the R14 value, but by using the (U ^* , V ^* ) chromaticity diagram, "hue" and "saturation" can be evaluated individually. This makes it possible to quantitatively and individually evaluate each of the "degrees".

Specifically, "hue" corresponds to types of colors such as red, green, and blue, and is the angle θ in the circumferential direction on the (U ^* , V ^* ) chromaticity diagram in FIG. It can be expressed as a characteristic defined by . Further, "chroma" refers to the vividness of a color, and can be expressed as a distance (length) from the origin 0 on the (U ^* , V ^* ) chromaticity diagram of FIG.

Based on this knowledge, the inventors of the present application have developed a method for defining an appropriate appearance of tree leaf colors using the (U ^* , V ^* ) chromaticity diagram corresponding to the leaf color chart (i.e., R14). , found that the following points are important.

First, in the (U ^* , V ^* ) chromaticity diagram of FIG. 2, in order to define an appropriate appearance of the color of the leaves, it is necessary that the angle θ is less than a certain angle. This is because if the angle θ is too large, the difference in "hue" will become large and it will look unnatural.

Second, it is necessary that r (=L ₁ /L ₀ ) be within a certain range. r is a parameter related to "saturation"; if r is too small, "saturation" will be insufficient and visibility will deteriorate; on the other hand, if r is too large, "saturation" will be too high, resulting in poor visibility. This is because it looks natural and is not desirable.

Here, changes in r, a parameter related to "saturation," are less likely to cause unnaturalness in the sense of color, but changes in angle θ, a parameter related to "hue," It turns out that people are more likely to feel unnatural sensations. For example, the natural light irradiating plants and the like changes frequently in daily life, so even if the saturation of the plants changes, the change feels natural to people. On the other hand, in daily life, the hue of plants, etc. rarely changes suddenly, so for example, the hue of plants may shift and become bluish green or yellowish green. When change occurs, it feels unnatural to people.

Also noteworthy is the discovery that there is an asymmetry in the allowable range of θ. Originally, the chromaticity point of the reference light source corresponding to the R14 color chart is located between green and yellow in terms of hue (tint). In this case, it was found that compared to the reference light source, the tolerance range is relatively large for the direction in which the sample light source deviates in the green direction, but on the contrary, the tolerance range is small in the direction in which the sample light source deviates in the yellow direction. Considering the value of θ, it was found that the tolerance range is wider when θ shifts in the positive direction (shifts toward green) compared to when θ shifts in the negative direction (shifts toward yellow). This is presumed to be due to the fact that compared to the reference light source, people tend to feel a sense of discomfort or discomfort when the light is shifted toward yellow. As described above, the present invention requires completely different technical research from the study of the R9 value in the prior literature, and is not an invention that can be simply inferred as a design matter from the prior literature. In other words, this technology was discovered by starting from scratch with a completely different approach to studying how human skin looks.

Hereinafter, the range of angles θ and r depending on the specifications and uses of the notification light source device 3 will be explained using FIGS. 3 to 5.

FIG. 3 is a diagram showing the first range in the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the leaf color of the notification light source device 3. In FIG. 3, in the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the leaf color in FIG. 2, the chromaticity point of the notification light source device 3 is -2.5≦θ≦4, and A case is shown in which the relationship 0.9≦r≦1.25 is defined.

By stipulating that the above relationship is satisfied, it becomes possible to secure the necessary appearance of the color of leaves to the extent that there are no major practical problems in general residential spaces such as homes, offices, and schools. . That is, it is possible to suppress the hue shift to an appropriate range, and to ensure the saturation of the color of the leaves to a level that poses no problem in practice.

FIG. 4 is a diagram showing a second range in the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the leaf color of the notification light source device 3. In FIG. 4, in the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the leaf color in FIG. 2, the chromaticity point of the notification light source device 3 is -0.5≦θ≦3, and A case is shown in which the relationship 1.0≦r≦1.20 is defined. That is, FIG. 4 shows a case in which the relationship in FIG. 3 is further defined to satisfy the relationships -0.5≦θ≦3 and 1.0≦r≦1.20.

By defining the above relationship to satisfy the above relationship, it is possible to ensure a more preferable appearance of the color of the leaves compared to the case shown in FIG. 3 when used in general residential spaces such as general homes, offices, and schools. That is, it is possible to suppress the hue shift to an appropriate range, to ensure the saturation of the color of the leaves to an acceptable level, and to suppress an excessive increase in the saturation.

FIG. 5 is a diagram showing the third range in the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the leaf color of the notification light source device 3. In FIG. 5, in the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the leaf color in FIG. 2, the chromaticity point of the notification light source device 3 is 0≦θ≦2 and 1.04. A case is shown in which the relationship is defined to satisfy the relationship ≦r≦1.10. That is, FIG. 5 shows a case where the relationship in FIG. 3 is further defined to satisfy the relationships 0≦θ≦2 and 1.04≦r≦1.10.

By stipulating that the above relationship is satisfied, it is possible to ensure a desirable appearance of the color of the leaves in a space where it is desired to express colors more favorably and vividly, such as in a store or an amusement facility. That is, it is possible to suppress the hue shift to an appropriate range, and it is also possible to ensure the saturation of the color of the leaves to a level that does not cause problems considering the intended use.

(Embodiment)
Hereinafter, more specific embodiments of the notification light source device 3 and the lighting system 1 including the notification light source device 3 will be described with reference to the drawings. A preferred specific example is shown below. Therefore, the numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples and do not limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims representing the most significant concept of the present invention will be explained as arbitrary constituent elements.

[Specific configuration of lighting system]
FIG. 6 is a block diagram showing the configuration of the lighting system 1.

As shown in FIG. 6, the lighting system 1 includes a plurality of base lighting devices 2, a plurality of notification light source devices 3, an information acquisition section 4, and a control section 5. Each base lighting device 2, each notification light source device 3, and information acquisition section 4 are communicatively connected to a control section 5.

The base lighting device 2 is used to illuminate an entire relatively wide space in a building, such as the interior of a general home, an office, a public facility such as a school, a store, an amusement facility, an art museum, a color inspection facility, or a factory/warehouse. For example, the total luminous flux when turned on with input power of 13 W is 1800 lm or more. The base lighting device 2 is, for example, a lighting device having a structure in which a straight tube LED lamp with a built-in LED module is attached to a fixture body attached to a ceiling 8 etc., or a lighting device configured by attaching a straight tube LED lamp with a built-in LED module to a fixture body attached to a ceiling 8 etc. This is a lighting device or the like that has a module directly installed. The base lighting device 2 is controlled to be lit by the control unit 5, and the base lighting device 2 sets the interior of the room to provide a preferable lighting environment. The space in this embodiment refers to the indoor space inside the room 7.

The information acquisition unit 4 is a device that acquires information regarding internal conditions and external conditions of a space, and is provided, for example, on the ceiling 8, wall, floor, pedestal, or outside the room 7 of the room 7. The information acquisition unit 4 is, for example, a temperature sensor, a humidity sensor, a gas sensor, a camera, a microphone, a pulse meter, a thermometer, an electroencephalogram, a power meter, a clock, and an illumination meter. The information acquisition unit 4 may be a communication module connected to an external information network.

The information regarding the internal conditions of the space that the information acquisition unit 4 acquires includes indoor temperature, humidity, air quality, odor, presence or absence of people, density of people, location of a specific person, volume of human voice, and conversation. activity level, specific sounds (e.g. voice ordering at a restaurant), human biological information (pulse, body temperature, brain waves such as alpha waves and beta waves), human emotions, human mental state, and indoor consumption. It is at least one of the amount of electric power (the amount of power consumed by an air conditioner, etc.). The information regarding the external conditions of the space is at least one of outdoor temperature, time (break time, etc.), illuminance, weather, traffic conditions (road congestion level, train time, bus time), and disaster information. . The information regarding the internal and external conditions of the space acquired by the information acquisition section 4 is output to the control section 5.

The control unit 5 is a device that controls the overall operation of the lighting system 1, and is realized by, for example, a microprocessor. The control unit 5 may be installed inside the room 7 or outside the room 7. The control unit 5 also includes a memory. A software program for operating the base lighting device 2, the notification light source device 3, the information acquisition section 4, and the control section 5 in cooperation is stored in the memory. Furthermore, information for controlling the dimming and color adjustment of the notification light source device 3 is stored in the memory. The information for controlling the dimming and color adjustment is, for example, lighting control information that can realize the chromaticity points shown in FIGS. 3 to 5. This lighting control information is stored in the memory in a state in which it is linked to information regarding the internal conditions and external conditions of the space.

The control unit 5 acquires information regarding the internal conditions and external conditions of the space output from the information acquisition unit 4. The control unit 5 compares the acquired information with the lighting control information stored in the memory, and outputs the lighting control information corresponding to the acquired information to the notification light source device 3.

The notification light source device 3 operates based on lighting control information output from the control section 5. This lighting control information is linked to each of the information regarding the internal conditions and external conditions of the space, so the notification light source device 3 is configured to control the lighting control based on at least one of the internal conditions and external conditions of the space. It will emit light. For example, the notification light source device 3 may irradiate the signal light so that the hue of the irradiated object remains constant and the saturation changes within the range shown in FIG. 4 or 5. The notification light source device 3 may irradiate the signal light so that the saturation of the irradiated object remains constant and the hue changes within the range shown in FIG. 4 or 5. The notification light source device 3 may irradiate the signal light so that both the saturation and hue of the irradiated object change within the range shown in FIG. 4 or 5.

In addition, although the example in which the control part 5 controls lighting of the notification light source device 3 was shown above, it is not limited to this. For example, if the notification light source device 3 includes a control unit with the same function as the control unit 5 described above, the notification light source device 3 controls its own lighting based on the information output from the information acquisition unit 4. You may go. Furthermore, when the lighting environment provided by the base lighting device 2 is not necessarily constant and changes over time, the notification light source 3 may emit signal light in accordance with the changing lighting environment.

[Specific configuration of notification light source device]
The notification light source device 3 is, for example, a lighting device having a configuration in which a light bulb-shaped LED lamp or a spot-shaped LED lamp is attached to a fixture body attached to a ceiling 8 or the like. Note that the notification light source device 3 is not limited to the ceiling 8, and may be installed on the floor, wall, pedestal, or the like.

The installation height of the notification light source device 3 is preferably 1 m or more and 4 m or less from the floor surface. By installing it at this height, the notification light source device 3 becomes easily visible. Further, it is more desirable that the installation height of the notification light source device 3 is 1 m or more and 3 m or less from the floor surface. By installing it at this height, the notification light source device 3 becomes more easily visible. Further, it is more desirable that the minimum height at which the notification light source device 3 is installed is 2.3 m or more so that it does not obstruct the view.

Note that the luminous flux of the notification light source device 3, which is the sample light source, is 50 [lm (lumens)] or less. According to this, the illumination environment formed by the base illumination can be prevented from being disturbed by the sample light source. Further, the illuminance at a position 2 m away from the notification light source device 3 is 10 [lx (lux)] or less in any direction. According to this, the irradiation light on the desk surface and the floor surface can be suppressed as much as possible, and disturbances in the lighting environment can be suppressed.

Further, in this embodiment, the luminous intensity of the signal light emitted from the notification light source device 3 in the horizontal direction is set to be higher than the luminous intensity directly below the signal light (downward in the vertical direction). In this way, by making the luminous intensity in the horizontal direction stronger than the luminous intensity directly below, it is possible to transmit information widely in the horizontal direction, while suppressing the illumination light on the desk top and floor surfaces as much as possible, and suppressing disturbances in the lighting environment. can.

In addition, in the above, the horizontal luminous intensity of the signal light emitted from the notification light source device 3 is set to be higher than the luminous intensity directly below the signal light, that is, the signal light is set such that (horizontal luminous intensity/luminous intensity directly below)>1 Although it has been shown that there is a relationship of .0, the relationship is not limited to this. For example, the signal light may have a relationship of (horizontal luminosity/luminous intensity directly below)>1.5, or (horizontal luminous intensity/luminous intensity directly below)>2.0, (horizontal luminous intensity) /Light intensity directly below)>3.0, or (Light intensity in the horizontal direction/Light intensity directly below)>5.0.

Further, the notification light source device 3 may emit monochromatic signal light and notify information by turning on or turning off the signal light. By making the signal light monochromatic, the structure of the device becomes simple. Further, the notification light source device 3 may notify information by emitting multicolored signal light and changing the hue expressed by the signal light. By changing the hue mentioned above, more information can be expressed than with a single color. Note that the signal light may be one that normally functions as general illumination. Further, the signal light may be used as ordinary decorative lighting without being caused by input information or the like, or may function as a signal light upon receiving some kind of command.

In the notification light source device 3 according to the present embodiment, θ and r in the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the leaf color can be changed as shown in FIGS. 3 to 5 depending on the specifications and uses. It is set to satisfy the relationship shown in one of them.

Since this notification light source device 3 emits light based on the lighting control information based on the chromaticity point described above, it is possible to ensure a visual appearance suitable for the color of the leaves on the trees.

Note that the chromaticity point in the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the color of leaves can be changed, for example, by changing the type and amount of phosphor contained in the sealing member 13 of the LED module 10. It can be adjusted by

A specific example of such a notification light source device 3 will be explained using FIG. 7. FIG. 7 is a diagram showing the configuration of the notification light source device 3 according to the embodiment of the present invention.

In FIG. 7, an integrated LED base light 410 is illustrated as the notification light source device 3. As shown in FIG. 7, the integrated LED base light 410 includes an LED module 10, a fixture body 411 in which the LED module 10 is installed, and a translucent cover 412 that covers the LED module 10. The module 10 and the instrument main body 411 are integrated.

For example, the LED module 10 is directly attached to the mounting surface of the instrument main body 411. Further, the appliance main body 411 is, for example, a circular base, and is fixed to the ceiling 8 via, for example, a rod-shaped fixture. The cover 412 has a circular shape, for example, and is fixed to the instrument main body 411 so as to cover the instrument main body 411.

In this embodiment, the integrated LED base light shown in FIG. 7 is a direct-mount type in which the fixture body is directly attached to the ceiling 8 etc., but it may also be a recessed type in which the fixture body is embedded in the ceiling 8 etc. good.

[LED module]
Next, the configuration of the LED module 10 used as a light source of each of the above-mentioned notification light source devices 3 will be explained using FIG. 8. FIG. 8 is a diagram showing the configuration of an LED module according to an embodiment of the present invention.

The LED module 10 is a light emitting module having a light emitting element, and emits light of a predetermined color (wavelength) such as white. The LED module 10 in this embodiment is a BY type white LED light source that emits white light using a blue LED chip and a yellow phosphor.

As shown in FIG. 8, the LED module 10 is a COB (Chip On Board) type light emitting module in which an LED chip is directly mounted on a substrate, and includes a substrate 11 and a plurality of LEDs (bare chips) 12. and a sealing member 13 that seals the LED 12.

The board 11 is a mounting board (insulating board) on which the LED 12 is mounted. Note that in the LED module 10 shown in FIG. 8, four substrates are used as the substrates 11 to form a donut shape when combined.

The substrate 11 is a ceramic substrate made of alumina, aluminum nitride, etc., a resin substrate made of resin such as epoxy resin, a metal base substrate made of metal such as aluminum alloy, or a glass substrate made of glass. Note that the substrate 11 is not limited to a rigid substrate, and may be a flexible substrate.

The LED 12 is an example of a light emitting element, and is a semiconductor light emitting element that emits light using a predetermined electric power. A plurality of LEDs 12 are arranged on the substrate 11, and are arranged in a line along the longitudinal direction of the substrate 11, for example. Note that the LEDs 12 may be arranged in multiple rows.

Each LED 12 is a bare chip that emits monochromatic visible light, and is, for example, a blue LED chip that emits blue light when energized. As the blue LED chip, for example, a gallium nitride-based semiconductor light emitting element made of an InGaN-based material and having a center wavelength of 440 nm to 470 nm can be used.

Note that each LED 12 can be connected in series, in parallel, or in a combination of series and parallel connections using metal wiring (not shown) or gold wire (not shown) patterned into a predetermined shape on the substrate 11. It can be configured as follows.

The sealing member 13 is made of resin, for example, and is formed to cover the LED 12 . For example, the sealing member 13 is formed in a linear shape so as to seal one row of the plurality of LEDs 12 at once. Note that the sealing member 13 may seal the LEDs 12 individually.

The sealing member 13 is mainly made of a translucent material, but if it is necessary to convert the wavelength of the light from the LED 12 to a predetermined wavelength, a wavelength conversion material is mixed into the translucent material.

The sealing member 13 in this embodiment is a wavelength conversion member that includes a phosphor as a wavelength conversion material and converts the wavelength (color) of light emitted by the LED 12. Such a sealing member 13 can be made of, for example, an insulating resin material containing phosphor particles (phosphor-containing resin). The phosphor particles are excited by the light emitted by the LED 12 and emit light of a desired color (wavelength). In other words, the sealing member 13 is a light emitting section that includes the LED 12.

As the resin material constituting the sealing member 13, for example, silicone resin can be used. Furthermore, a light diffusing material such as silica may be dispersed in the sealing member 13. Note that the sealing member 13 does not necessarily need to be formed of a resin material, and may be formed of an organic material such as a fluororesin, or an inorganic material such as a low-melting glass or a sol-gel glass.

For example, when the LED 12 is a blue LED chip that emits blue light, the phosphor particles to be contained in the sealing member 13 include, for example, YAG (yttrium aluminum garnet)-based yellow phosphor to obtain white light. Particles can be used. Specifically, as the sealing member 13, a phosphor-containing resin in which YAG-based yellow phosphor particles are dispersed in a silicone resin can be used. As a result, the yellow phosphor particles are excited by the blue light from the blue LED chip and emit yellow light, so that white light is emitted from the sealing member 13 as a composite light of the excited yellow light and the blue light from the blue LED chip. light is emitted.

Note that the substrate 11 may also be formed with an electrode terminal for receiving DC power for causing the LED 12 to emit light, or a white resist for improving the insulation and reflectivity of the substrate 11.

In the LED module 10 configured in this manner, for example, by changing the type and amount of the phosphor contained in the sealing member 13, the color rendering performance of the emitted light can be changed. That is, by adjusting the type and amount of the phosphor, the position of the chromaticity point in the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the leaf color in FIG. 2 can be changed. For example, in the case of the BY type white LED light source as described above, the color rendering properties can be improved by further mixing a red phosphor or a green phosphor in addition to the yellow phosphor.

In the above embodiment, the LED module 10 has a COB type structure in which the LED chip is directly mounted on the substrate 11, but the present invention is not limited to this. Instead of the COB type LED module 10, as shown in FIG. 9, an SMD (Surface Mount Device) type LED module 10A may be used. The LED module 10A uses a package type LED (SMD type LED element) 12A as a light emitting element, and can be constructed by mounting a plurality of LEDs 12A (light emitting part) on the substrate 11. The LED 12A includes a resin container (package) 12a having a recess, an LED chip 12b placed inside the container 12a (inside the recess), and formed inside the container 12a (inside the recess) so as to cover the LED chip 12b. and a sealing member (phosphor-containing resin) 12c.

[Modified example of lighting system]
Hereinafter, a modification of the lighting system 1 will be described. For example, the base lighting device 2 is independent from the control unit 5 and does not need to communicate with the control unit 5. FIG. 10 is a block diagram showing the functional configuration of a lighting system 1a according to the first modification.

Further, a server device 6 may be connected to the control unit 5, an external information source 9 may be connected to the server device 6, and the server device 6 may provide information obtained from the external information source 9 to the control unit 5. FIG. 11 is a block diagram showing the mechanical configuration of a lighting system 1b according to such a second modification.

The server device 6 manages weather information in the area to which the space belongs, disaster information in the area to which the space belongs, traffic information around the area to which the space belongs, current time information, etc., and controls these information. This is a computer device provided to Department 5. The external information source 9 may be a sensor or may be another server device different from the server device 6. For example, if disaster information such as J alert is provided to the server device 6 by the external information source 9, the control unit 5 can cause the notification light source device 3 to emit light based on the disaster information.

(summary)
The notification light source device 3 according to the present embodiment is a device that emits light based on at least one of the internal conditions and external conditions of the space. The notification light source device 3 sets the chromaticity point of the reference light source to (U ^* ₀ , V ^* ₀ ) in the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of the color of the leaves. The chromaticity point when is the sample light source is (U ^* ₁ , V ^* ₁ ), the length of the first line segment connecting the origin and the chromaticity point of the reference light source is L ₀ , and the distance between the origin and the sample is The length of the second line segment connecting the chromaticity point of the light source is _L1 , the angle between the first line segment and the second line segment is θ (°),
L ₀ = ((U ^* ₀ ) ² + (V ^* ₀ ) ² ) ^1/2 ,
L ₁ = ((U ^* ₁ ) ² + (V ^* ₁ ) ² ) ^1/2 ,
θ = (tan ^-1 (V ^* ₁ / U ^* ₁ ) - tan ^-1 (V ^* ₀ / U ^* ₀ )) × (180/π),
When r=L ₁ /L ₀ ,
The following relationships are satisfied: -2.5≦θ≦4 and 0.9≦r≦1.25.

According to this configuration, it is possible to provide the notification light source device 3 that can ensure visibility suitable for the color of the leaves on the trees.

Furthermore, the notification light source device 3 may further satisfy the relationships of -0.5≦θ≦3 and 1.0≦r≦1.20.

According to this configuration, it is possible to further ensure that the appearance is suitable for the color of the leaves on the trees.

Further, the notification light source device 3 may further satisfy the relationships of 0≦θ≦2 and 1.04≦r≦1.10.

According to this configuration, it is possible to further ensure that the appearance is suitable for the color of the leaves on the trees.

Moreover, the luminous flux of the sample light source may be 50 [lm] or less.

According to this configuration, it is possible to suppress the illumination environment formed by the base illumination from being disturbed by the sample light source.

Further, the illuminance at a position 2 m away from the sample light source may be 10 [lx] or less in any direction.

According to this configuration, it is possible to suppress the irradiation light on the desk surface and the floor surface as much as possible, and to suppress disturbances in the lighting environment.

Further, when the light emitted from the sample light source is used as the signal light, the luminous intensity of the signal light in the horizontal direction may be higher than the luminous intensity immediately below the signal light.

In this way, by making the luminous intensity in the horizontal direction stronger than the luminous intensity directly below, it is possible to transmit information widely in the horizontal direction, while suppressing the illumination light on the desk top and floor surfaces as much as possible, and suppressing disturbances in the lighting environment. can.

Further, when the light emitted from the sample light source is used as signal light, the signal light is monochromatic, and the sample light source may notify information by turning on or off the signal light.

For example, by making the signal light monochromatic, the structure of the device can be simplified.

In addition, the internal conditions mentioned above include indoor temperature, humidity, air quality, odor, the presence or absence of people, the density of people, the location of specific people, the volume of human voices, the level of activity of conversation, and specific sounds. , human biological information, human emotions, and indoor power consumption, and the external conditions include at least one of outdoor temperature, time, illuminance, weather, traffic conditions, and disaster information. It may be one.

According to this configuration, it is possible to provide the notification light source device 3 that can ensure a visual appearance suitable for the color of the leaves of a tree, depending on the internal conditions and external conditions described above.

(Other embodiments)
Although the notification light source device according to the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments.

For example, in the above embodiment, the LED module 10 is configured to emit white light using a blue LED chip and a yellow phosphor, but the present invention is not limited to this. For example, instead of using a yellow phosphor, a phosphor-containing resin containing a red phosphor and a green phosphor may be used, and this may be combined with a blue LED chip to emit white light. can. Alternatively, a configuration may be adopted in which a blue LED chip, a red LED chip, and a green LED chip are used to emit white light without using a phosphor.

Furthermore, in the above embodiments, an LED chip that emits a color other than blue may be used as the LED chip. For example, when using an LED chip that emits ultraviolet light, the phosphor particles may be a combination of phosphor particles of each color that emit light in the three primary colors (red, green, and blue). Furthermore, wavelength conversion materials other than phosphor particles may be used. For example, wavelength conversion materials such as semiconductors, metal complexes, organic dyes, and pigments absorb light of a certain wavelength and produce wavelengths different from the absorbed light. A material containing a substance that emits light may also be used.

Furthermore, in the above embodiments, an LED (LED chip) is used as an example of a light emitting element, but other solid state elements such as a semiconductor light emitting element such as a semiconductor laser, an EL element such as an organic EL (electro luminescence) or an inorganic EL, etc. A light emitting element may also be used.

Further, in the above embodiment, the chromaticity point in the (U ^* , V ^* ) chromaticity diagram is changed by changing the type and amount of the phosphor, but the present invention is not limited to this. For example, the chromaticity point in the (U ^* , V ^* ) chromaticity diagram can be changed by changing the emitted light color (wavelength) of the LED chip, or by adjusting the output or number of LED chips mounted. It is possible.

In addition, forms obtained by applying various modifications to the embodiments and modifications that those skilled in the art can think of, and arbitrary combinations of components and functions in the embodiments and modifications without departing from the spirit of the present invention. The present invention also includes forms realized by the following.

3 Notification light source device

Claims (8)

An information light source device that emits light based on at least one of internal conditions and external conditions of a space,
In the (U ^* , V ^* ) chromaticity diagram corresponding to the color chart of tree leaves, the chromaticity point of the reference light source is (U ^* ₀ , V ^* ₀ ), and the notification light source device is used as the sample light source. The chromaticity point is (U ^* ₁ , V ^* ₁ ), the length of the first line segment connecting the origin and the chromaticity point of the reference light source is _L0 , and the origin and the chromaticity point of the sample light source are The length of the second connecting line segment is _L1 , the angle between the first line segment and the second line segment is θ (°),
L ₀ = ((U ^* ₀ ) ² + (V ^* ₀ ) ² ) ^1/2 ,
L ₁ = ((U ^* ₁ ) ² + (V ^* ₁ ) ² ) ^1/2 ,
θ = (tan ^-1 (V ^* ₁ / U ^* ₁ ) - tan ^-1 (V ^* ₀ / U ^* ₀ )) × (180/π),
When r=L ₁ /L ₀ ,
A light source device for notification that satisfies the relationship of -2.5≦θ≦4 and 0.9≦r≦1.25. The notification light source device according to claim 1, further satisfying the following relationships: -0.5≦θ≦3 and 1.0≦r≦1.20. The notification light source device according to claim 1, further satisfying the following relationships: 0≦θ≦2 and 1.04≦r≦1.10. The notification light source device according to any one of claims 1 to 3, wherein a luminous flux of the sample light source is 50 [lm] or less. The notification light source device according to any one of claims 1 to 3, wherein illuminance at a position 2 m away from the sample light source is 10 [lx] or less in any direction. The notification device according to any one of claims 1 to 3, wherein when the light emitted from the sample light source is signal light, the horizontal luminous intensity of the signal light is higher than the luminous intensity directly below the signal light. Light source device. Any one of claims 1 to 3, wherein when the light emitted from the sample light source is signal light, the signal light is monochromatic, and the sample light source notifies information by turning on or turning off the signal light. The notification light source device described in . The internal conditions include indoor temperature, humidity, air quality, odor, the presence or absence of people, the density of people, the location of a specific person, the volume of a person's voice, the activity level of conversation, a specific sound, and the presence of a person. at least one of biological information, human emotions, and indoor power consumption;
The notification light source device according to claim 1, wherein the external condition is at least one of outdoor temperature, time, illuminance, weather, traffic conditions, and disaster information.

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