JP6982545B2 - Lighting device and dimming method of lighting device - Google Patents

Description

The present invention relates to a lighting device and a dimming method for the lighting device.

Regarding dimming of a lighting device in which a plurality of light sources are installed at intervals (hereinafter, also referred to as a conventional lighting device), for example, Patent Document 1 describes a light source unit in which a plurality of light sources are installed at intervals. A method of dimming by arranging a plurality of fluorescent element units in which a plurality of fluorescent elements are installed at intervals so as to face each other and moving each fluorescent element unit with respect to a light source unit is disclosed. There is. In this method, the light emitted from a plurality of light sources is dimmed by changing the degree of overlap between the light source and each fluorescent element.

By the way, as the conventional lighting device, as shown in FIG. 8, a plurality of purple LED elements 210 are installed at intervals, and the plurality of purple LED elements 210 are installed in an RGB fluorescent layer 220 (red phosphor, green phosphor). , A fluorescent layer containing a blue fluorescent substance), and the following phenomenon has been confirmed in this illuminating device 200.

More specifically, when the lighting device 200 is visually viewed from the fluorescent layer 220 side, the portion located directly above each purple LED element 210 has a strong blue color, whereas the portion directly above each purple LED element 210. The part that is not located in is a strong red color.

This phenomenon is caused by the following principle. That is, when a general phosphor absorbs light of a certain wavelength, it emits light having a wavelength longer than the wavelength of the absorbed light. Then, in the lighting device 200, the distance of the light emitted from the purple LED element 210 passing through the RGB fluorescent layer 220 becomes longer as it goes away from directly above it (see the dotted line in FIG. 8). Therefore, the light emitted from the purple LED element 210 is converted into light having a longer wavelength by each phosphor contained in the RGB fluorescent layer 220 as the direction away from the purple LED element 210 increases. As a result, the closer to directly above the purple LED element 210, the shorter the wavelength of blue, the stronger the chromaticity of light is emitted, while the farther away from directly above the purple LED element 210, the longer the wavelength of red, the stronger the chromaticity of light is emitted. Ru.

Japanese Unexamined Patent Publication No. 2008-186777

Therefore, the main object of the present invention is to provide a new dimming method by utilizing the above phenomenon with respect to a lighting device in which a plurality of light sources are installed at intervals.

That is, the lighting device according to the present invention is arranged with a light source unit having an installation area in which a plurality of light sources are installed in an array at intervals on a predetermined surface, and is arranged so as to face the installation area, from each of the light sources. A single fluorescent layer that converts the wavelength of the emitted light, and a plurality of colors that are arranged so as to face the installation area with the fluorescent layer interposed therebetween and change the chromaticity of the light emitted from the fluorescent layer. The degree changing element includes a chromaticity changing unit installed in an array along a plane parallel to the predetermined surface, and the chromaticity changing unit is slidable along the predetermined surface with respect to the light source unit. The position of each chromaticity changing element with respect to each light source is determined so that the chromaticity of the light emitted through the chromaticity changing unit becomes a predetermined chromaticity. It is a thing.

In such a case, the difference in chromaticity centered on the light source in the light emitted from the fluorescent layer is determined by the degree of overlap between the portion directly above the light source of the fluorescent layer and the chromaticity changing element and the non-directly above the light source of the fluorescent layer. It can be adjusted by changing the degree of overlap between the portion and the chromaticity changing element. This enables dimming of the lighting device. In addition, the array shape is not only a mode in which a plurality of light sources or chromaticity changing elements are arranged two-dimensionally, in other words, in a plane, but also a mode in which a plurality of light sources or chromaticity changing elements are arranged one-dimensionally, in other words, linearly or curvedly. Is also a concept.

Further, the light source unit installs the plurality of light sources at a predetermined pitch at intervals, and the chromaticity changing unit arranges the plurality of chromaticity changing elements at the same pitch as the predetermined pitch. It was installed. Even in such a case, it becomes easy to grasp in advance the chromaticity of the light emitted from each of the portion directly above the light source and the portion not directly above the light source of the fluorescent layer, and dimming becomes easy.

Specifically, the chromaticity changing element selectively transmits or reflects the wavelength of the light emitted from the fluorescent layer, or converts the wavelength of the light emitted from the fluorescent layer. be.

Further, it further includes a position adjusting mechanism for adjusting the position of each chromaticity changing element with respect to each light source by sliding the chromaticity changing unit with respect to the light source unit along the predetermined surface. With such a case, it becomes easy to finely adjust the position of the chromaticity changing unit with respect to the light source unit.

Further, the dimming method of the lighting device according to the present invention is a dimming method of a lighting device including a light source unit having an installation area in which a plurality of light sources are installed in an array at intervals on a predetermined surface. A single fluorescent layer that converts the wavelength of the light emitted from each of the light sources is arranged so as to face the installation area, and a plurality of chromaticity changes that change the chromaticity of the light emitted from the fluorescent layer. The chromaticity changing units in which the elements are arranged in an array along a plane parallel to the predetermined surface are arranged so as to face the installation area with the fluorescent layer interposed therebetween, and the chromaticity is described with respect to the light source unit. The changing unit is slid along the predetermined surface, and the chromaticity changing element for each light source is set so that the chromaticity of the light emitted through the chromaticity changing unit becomes a predetermined target chromaticity. It adjusts the position.

According to the present invention, it is possible to easily perform dimming of a lighting device in which a plurality of light sources are arranged at intervals.

It is an exploded perspective view schematically showing the lighting apparatus which concerns on Embodiment 1. FIG. It is sectional drawing which shows typically the lighting apparatus which concerns on Embodiment 1. FIG. It is a top view which shows the slide state of the chromaticity change unit with respect to the light source unit of the lighting apparatus which concerns on Embodiment 1. FIG. It is a schematic diagram for demonstrating the dimming principle of the lighting apparatus which concerns on Embodiment 1. FIG. It is a schematic diagram which shows typically the lighting apparatus which concerns on Embodiment 2. It is a schematic diagram which shows the slide state of the chromaticity change unit with respect to the light source unit of the lighting apparatus which concerns on Embodiment 3. FIG. It is a schematic diagram which shows the slide state of the chromaticity change unit with respect to the light source unit of the lighting apparatus which concerns on other embodiment. It is a schematic diagram which shows the conventional lighting apparatus.

Hereinafter, the lighting device according to the present invention will be described with reference to the drawings.

The lighting device according to the present invention is not particularly limited in its use, but is suitable for use as indoor lighting because it can perform delicate dimming (color matching), and is particularly suitable for an observer. It is preferable to use it as interior lighting for museums and museums where works of art that need to convey color are exhibited.

<Embodiment 1> As shown in FIGS. 1 and 2, the lighting device 100 according to the present embodiment includes a light source unit 10 having an installation area R in which a plurality of light sources 11 are installed at intervals on a predetermined surface S. , A single fluorescent layer 20 arranged so as to face the entire installation area R of the light source unit 10 and a chromaticity change arranged so as to face the installation area R of the light source unit 10 with the fluorescent layer 20 interposed therebetween. It is equipped with a unit 30 and.

The light source unit 10 has a plurality of light sources 11 arranged in an array on a substrate 12. As the light source 11, for example, an LED element such as a purple LED element can be used. In this embodiment, the surface of the substrate 12 is a predetermined surface S, and a plurality of light sources 11 are arranged vertically and horizontally at a predetermined pitch on the surface.

The fluorescent layer 20 contains a phosphor that converts the wavelength of light emitted from each light source 11 into different wavelengths. Specifically, the fluorescent layer 20 is a fluorescent layer 20 in which the same type of fluorescent material is dispersed over the entire area thereof. In the present embodiment, a binder (for example, a silicone resin) containing the fluorescent substance is laminated on the light source unit 10 to form the fluorescent layer 20. Therefore, the light source unit 10 and the fluorescent layer 20 are integrated. Further, as the fluorescent substance, a red fluorescent substance, a green fluorescent substance, and a blue fluorescent substance (hereinafter, these three fluorescent substances are collectively referred to as an RGB fluorescent substance) are used, but the present invention is not limited to this, and various types are used. Fluorescent materials can be used or combined.

The chromaticity changing unit 30 is a transparent substrate 32 in which a plurality of chromaticity changing elements 31 for changing the chromaticity of light emitted from the fluorescent layer 20 are arranged in an array. The chromaticity changing element 31 is a wavelength selection element that selectively transmits or reflects a part of the wavelength of the light emitted from the fluorescent layer 20, and converts the wavelength of the light emitted from the fluorescent layer 20 into a different wavelength. A wavelength conversion element is included. The plurality of chromaticity changing elements 31 are arranged on a plane parallel to the predetermined surface S of the light source unit 10. Here, the plane on which the plurality of chromaticity changing elements 31 are arranged may not be parallel to the predetermined surface S in a strict sense, and may be slightly inclined with respect to the predetermined surface S.

The wavelength selection element may have a property of reflecting or transmitting all of the predetermined wavelengths among the wavelengths of the light emitted from the fluorescent layer 20, or may transmit a part of the predetermined wavelength. It may also have the property of reflecting the rest, or it may be a combination of these two properties.

The wavelength conversion element contains a phosphor that converts the wavelength of light emitted from the fluorescent layer 20 into a different wavelength. The wavelength conversion element can be formed by laminating a binder containing a phosphor as in the fluorescent layer 20 on the transparent substrate 32.

In this embodiment, a plurality of chromaticity changing elements 31 are arranged vertically and horizontally at the same pitch as the predetermined pitch on the transparent substrate 32 to form the chromaticity changing unit 30. The chromaticity changing element 31 is a filter that transmits all of the red wavelengths of the wavelengths of the light emitted from the fluorescent layer 20, transmits a part of the green and blue wavelengths, and reflects the rest. The shape of the wavelength selection element is used.

Next, a dimming method of the lighting device 100 according to the present embodiment will be described.

In the present embodiment, as described above, since the fluorescent layer 20 is laminated on the substrate 12 constituting the light source unit 10, the light source unit 10 and the fluorescent layer 20 are integrated. Therefore, first, a chromaticity changing unit 30 separate from these is arranged on the fluorescent layer 20. Then, the chromaticity changing unit 30 is slid along a plane parallel to the predetermined surface S with respect to the light source unit 10 so that the chromaticity of the light emitted through the fluorescent layer 20 becomes a predetermined target chromaticity. While doing so, the degree of overlap between each light source 11 and each chromaticity changing element 31 is adjusted for dimming. Here, the degree of overlap can be said to be the size of the area where the light source 11 and the chromaticity changing element 31 overlap when viewed from a direction orthogonal to the predetermined surface S.

In this embodiment, as shown in FIG. 3, the chromaticity changing unit 30 is slid and moved in parallel to the light source unit 10 without rotating. Therefore, the degree of overlap of the chromaticity changing elements 31 corresponding to each light source 11 is the same. As a result, the chromaticity of the light emitted from the illuminating device 100 becomes substantially uniform over the entire light emitting surface.

Then, after the dimming is completed, the chromaticity changing unit 30 is fixed on the fluorescent layer 20 in a state where the degree of overlap is maintained, that is, a state where the position of the chromaticity changing unit 20 with respect to the light source unit 10 is maintained. It is possible to obtain a lighting device that emits light of a target chromaticity.

As a means for fixing the chromaticity changing unit 30 on the fluorescent layer 20, the chromaticity changing unit 30 may be attached and fixed on the fluorescent layer 20 with an adhesive, an adhesive, or the like, or the light source unit. 10. The fluorescent layer 20 and the chromaticity changing unit 30 may be fixed together by a clamp member or the like that sandwiches the chromaticity changing unit 30 together. In addition, the chromaticity changing unit 30 can be fixed to the light source unit 10 so as not to be displaced. It is not particularly limited as long as it is such a means.

Next, the dimming principle of the lighting device according to the present embodiment will be described with reference to FIG. Note that FIG. 4A shows a state in which the light source 11 and the chromaticity changing element 31 do not completely overlap, and FIG. 4B shows a state in which the light source 11 and the chromaticity changing element 31 completely overlap. It shows the state.

Here, in order to briefly explain the dimming principle according to the present embodiment, the following assumptions are made. In the portion A (hereinafter, also referred to as the portion A directly above the light source) located directly above the light source 11 of the fluorescent layer 20, the light having a purple wavelength emitted from the light source 11 is red [intensity 1], green [intensity 2], and light. In the portion B (hereinafter, also referred to as the portion B not directly above the light source), which is converted into light having a wavelength of blue [intensity 3] and is not located directly above the light source 11 of the fluorescent layer 20, the light having a purple wavelength emitted from the light source 11 is emitted. Is converted into light having wavelengths of red [intensity 3], green [intensity 2], and blue [intensity 1]. Further, the chromaticity changing element 31 transmits all of the light having a red wavelength among the wavelengths of the light emitted from the fluorescent layer 20, transmits 1/2 of the light having a green wavelength, and is 1/2. Is reflected, and it is assumed that 1/3 of the light having a blue wavelength is transmitted and 2/3 is reflected. Further, it is assumed that all of the light of the wavelength reflected by the chromaticity changing element 31 passes through the fluorescent layer 20 and is emitted through the transparent substrate 32 without passing through the chromaticity changing element 31 again. .. In the following, the numerical value in square brackets is used as the intensity, and the value after the decimal point 2 is omitted.

First, in a state where each light source 11 and each chromaticity changing element 31 do not completely overlap, as shown in FIG. 4A, light having a wavelength converted by the fluorescent layer 20 is emitted from the portion A directly above the light source. It is ejected as it is through the transparent substrate 32. Specifically, light having wavelengths of red [1], green [2], and blue [3] is emitted from the portion A directly above the light source via the transparent substrate 32.

On the other hand, from the portion B not directly above the light source, light having a wavelength converted by the fluorescent layer 20 is emitted with the chromaticity changed by the chromaticity changing element 31. Specifically, from the portion B directly above the light source, all of the light having the wavelength converted into red [3] by the fluorescent layer 20 passes through the chromaticity changing element 31. Further, in the light having a wavelength converted to green [2] by the fluorescent layer 20, the green [1] is transmitted through the chromaticity changing element 31, and the remaining green [1] is reflected by the chromaticity changing element 31. .. Further, in the light having a wavelength converted to blue [1] by the fluorescent layer 20, the blue color [0.33] passes through the chromaticity changing element 31, and the remaining blue color [0.66] passes through the chromaticity changing element 31. Is reflected by.

Further, the light reflected by the chromaticity changing element 31 is converted again by the fluorescent layer 20 and emitted from the transparent substrate 32. Specifically, the light having a wavelength of green [1] reflected by the chromaticity changing element 31 is converted into light having a wavelength of green [0.5] and red [0.5] by the fluorescent layer 20 and is transparent. It is ejected from the substrate 32. Further, the light having a wavelength of blue [0.66] reflected by the chromaticity changing element 31 is converted into light having a wavelength of green [0.33] and red [0.33] by the fluorescent layer 20, and is a transparent substrate. Ejected from 32.

Therefore, in a state where each light source 11 and each chromaticity changing element 31 do not completely overlap, red [4.83], green [3.83], and blue [3.33] are viewed from the entire lighting device 100. Light of the wavelength of will be emitted.

Next, in a state where each light source 11 and each chromaticity changing element 31 completely overlap, as shown in FIG. 4B, the light having the wavelength converted by the fluorescent layer 20 is the chromaticity changing element 31. The chromaticity is changed by and ejected. Specifically, from the portion A directly above the light source, all of the light having the wavelength converted into red [1] by the fluorescent layer 20 passes through the chromaticity changing element 31. Further, in the light having a wavelength converted to green [2] by the fluorescent layer 20, the green [1] is transmitted through the chromaticity changing element 31, and the remaining green [1] is reflected by the chromaticity changing element 31. .. Further, in the light having a wavelength converted to blue [3] by the fluorescent layer 20, the blue [1] is transmitted through the chromaticity changing element 31, and the remaining blue [2] is reflected by the chromaticity changing element 31. ..

Further, the light reflected by the chromaticity changing element 31 is converted again by the fluorescent layer 20 and emitted from the transparent substrate 32. Specifically, the light having a wavelength of green [1] reflected by the chromaticity changing element 31 is converted into light having a wavelength of green [0.5] and red [0.5] by the fluorescent layer 20 and is transparent. It is ejected from the substrate 32. Further, the light having a wavelength of blue [2] reflected by the chromaticity changing element 31 is converted into light having a wavelength of green [1] and red [1] by the fluorescent layer 20 and emitted from the transparent substrate 32.

On the other hand, from the portion B directly above the light source, light having a wavelength converted by the fluorescent layer 20 is emitted as it is through the transparent substrate 32. Specifically, light having wavelengths of red [3], green [2], and blue [1] is emitted from the portion B directly above the light source via the transparent substrate 32.

Therefore, in a state where each light source 11 and each chromaticity changing element 31 completely overlap, the wavelengths of red [5.5], green [4.5], and blue [2] are viewed from the entire lighting device 100. Light will be emitted.

As can be seen from the above virtual example, by changing the degree of overlap between each light source 11 and each chromaticity changing element 31, the intensity of light of each wavelength emitted from the entire lighting device 100 can be adjusted. This enables dimming of the lighting device 100.

<Embodiment 2> This embodiment is a modification of the lighting device 100 according to the first embodiment, and the lighting device 100 according to the present embodiment is for adjusting the position of the chromaticity changing unit 30 with respect to the light source unit 10. The configuration is different from that of the first embodiment in that the position adjusting mechanism 40 is provided, but the other configurations are the same.

As shown in FIG. 5, the position adjusting mechanism 40 is a support body provided with a light source unit 10 on which the fluorescent layer 20 is laminated and a support groove 43 into which the chromaticity changing unit 30 is slidably inserted. 40 and a screw 42 for fixing the chromaticity changing unit 30 inserted into the support 40 to the light source unit 10 on which the fluorescent layer 20 is laminated are provided.

With such a configuration, the degree of overlap of the chromaticity changing element 31 with respect to each light source 11 can be adjusted by adjusting the slide position of the chromaticity changing unit 30 with respect to the light source unit 10 fixed to the support groove 43. Therefore, the dimming of the lighting device 100 can be performed.

<Embodiment 3> This embodiment is a modified example of the dimming method in the lighting device 100 according to the first embodiment. In the embodiment shown in FIG. 6, an arbitrary axis perpendicular to the predetermined surface S is used as a rotation axis, and the light source unit 10 is slid and moved so as to rotate with respect to the chromaticity changing unit 30.

If this is the case, the degree of overlap of the dye changing elements 31 corresponding to each light source 11 will be different. Specifically, the degree of overlap of the chromaticity changing elements 31 corresponding to each light source 11 changes depending on the distance from the rotation axis of each light source 11. As a result, the chromaticity of the light emitted from the lighting device 100 changes depending on the distance from the rotation axis. In the embodiment shown in FIG. 6, the light source 11 having a longer distance from the rotation axis has a smaller degree of overlap with the chromaticity changing element 31.

As the arbitrary axis, for example, an axis passing through the center of the installation area R as shown in FIG. 6A, an axis passing through the corner of the installation area R as shown in FIG. 6B, and the like are selected. be able to.

<Other Embodiments> In each of the above-described embodiments, the light source 11 has the same pitch in the vertical direction and the pitch in the horizontal direction, but the pitch in the vertical direction and the pitch in the horizontal direction may be different. Further, as shown in FIG. 7, a plurality of light sources 11 may be arranged concentrically and arranged at equal pitches on each circle. The chromaticity changing element 31 is arranged in the same manner as the plurality of light sources 11 so as to face the ring-shaped installation area R in which the plurality of light sources 11 are installed. In this case, when the chromaticity changing unit 30 is slid so as to rotate with respect to the light source unit 10 with the center of the concentric circles as the rotation axis, the degree of overlap of the chromaticity changing elements 31 corresponding to each light source 11 is increased. It changes depending on the distance from the rotation axis of the light source 11. In the embodiment shown in FIG. 7, the light source 11 having a longer distance from the rotation axis has a smaller degree of overlap with the chromaticity changing element 31.

Further, in each of the above-described embodiments, the chromaticity changing elements 31 are arranged at the same pitch as the light source 11, but may be arranged at different pitches.

Further, in the above-described embodiment, the fluorescent layer 20 is laminated on the light source unit 10 and integrally formed, but the fluorescent layer 20 may be formed as a separate body from the light source unit 10, and may be fluorescent. The layer 20 may be integrated with the chromaticity changing unit 30. In any case, the fluorescent layer 20 is arranged so as to face the installation area R of the light source unit 10.

Further, in each of the above-described embodiments, the same type of elements are used as the plurality of chromaticity changing elements 31 arranged in the chromaticity changing unit 20, but two or more types may be used. In this case, two or more types of chromaticity changing elements 31 may be arranged alternately at intervals, or may be arranged so as to be alternately and continuously connected. That is, the plurality of chromaticity changing elements 31 arranged in the chromaticity changing unit 20 do not necessarily have to be arranged at intervals. However, when the adjacent chromaticity changing elements 31 are of the same type, it is necessary to arrange them at intervals. Incidentally, the same type of chromaticity changing element changes the light having a predetermined chromaticity to a predetermined chromaticity, while the different chromaticity changing elements differ from the light having a predetermined chromaticity. It changes to chromaticity.

In addition, the present invention is not limited to each of the above-described embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

100 Lighting device 10 Light source unit S Predetermined surface R Installation area 11 Light source 20 Fluorescent layer 30 Chromaticity changing unit 31 Dye changing element

Claims (6)

A light source unit having an installation area in which a plurality of light sources are installed in an array at intervals on a predetermined surface, and a light source unit.
A single fluorescent layer that is arranged to face the installation area and converts the wavelength of light emitted from each of the light sources.
A plurality of chromaticity changing elements arranged so as to face the installation area with the fluorescent layer interposed therebetween and changing the chromaticity of the light emitted from the fluorescent layer are arranged in an array along a plane parallel to the predetermined surface. Equipped with a chromaticity changing unit installed in
The chromaticity changing unit is configured to be slidable along the predetermined surface with respect to the light source unit, and the chromaticity of the light emitted through the chromaticity changing unit becomes a predetermined target chromaticity. In addition, the lighting device is characterized in that the position of each chromaticity changing element is determined with respect to each of the light sources. The light source unit installs the plurality of light sources at predetermined pitches at intervals.
The lighting device according to claim 1, wherein the chromaticity changing unit installs the plurality of chromaticity changing elements at the same pitch as the predetermined pitch at intervals. The lighting device according to claim 1 or 2, wherein the chromaticity changing element selectively transmits or reflects the wavelength of light emitted from the fluorescent layer. The lighting device according to claim 1 or 2, wherein the chromaticity changing element converts the wavelength of light emitted from the fluorescent layer. One of claims 1 to 4, further comprising a position adjusting mechanism for adjusting the position of each chromaticity changing element with respect to each light source by sliding the chromaticity changing unit along the predetermined surface with respect to the light source unit. The lighting device described in. A method of dimming a lighting device including a light source unit having an installation area in which a plurality of light sources are arranged in an array at intervals on a predetermined surface.
A single fluorescent layer that converts the wavelength of the light emitted from each of the light sources is arranged so as to face the installation area.
A chromaticity changing unit in which a plurality of chromaticity changing elements for changing the chromaticity of light emitted from the fluorescent layer are installed in an array along a plane parallel to the predetermined surface is sandwiched between the fluorescent layers. Place it so that it faces the installation area,
The chromaticity changing unit is slid with respect to the light source unit along the predetermined surface so that the chromaticity of the light emitted through the chromaticity changing unit becomes a predetermined target chromaticity. A method for dimming a lighting device, which comprises adjusting the position of each chromaticity changing element with respect to each light source.

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