JP2016149229A - Luminaire and lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire and a lighting fixture which maintain high color rendering properties, and which emit illumination light that excels in other appearance of an object to be radiated.SOLUTION: A luminaire includes: a light source 10 having a solid light emitting element for emitting light of an emission spectrum which has first emission peak intensity in the wavelength region of 440 nm or greater and 465 nm or less, and second emission peak intensity which is larger than the first emission peak intensity in the wavelength region of 600 nm or greater and 640 nm or less; and a filter 20 arranged on the emission side of the light source 10 and having an absorption characteristic in the wavelength region of 580 nm or greater and 600 nm or less. In the light from the light source 10 which has transmitted the filter 20, Duv for showing color deviation is -10 or greater and 0 or less, Ra for showing a general color rendering index is 90 or greater, PS for showing a favorable index of skin color is 90 or greater and FCI for showing a feeling of contrast index is 120 or greater.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device and a lighting fixture.

  Solid light-emitting elements such as light emitting diodes (LEDs) are widely used in various devices as light sources for illumination or displays because of their small size and high efficiency. In this case, a white LED light source is used as the light source.

  A white LED light source using an LED has a problem that color rendering is lower than that of a fluorescent lamp. Therefore, as a method to improve the color rendering properties of white LED light sources, a filter that selectively absorbs specific wavelengths is arranged on the light emission side of the white LED light sources to select light with an unnecessary emission wavelength of the white LED light sources. Has been proposed (Patent Document 1). As such a filter, a dye-added filter made of a compound of a dye material that absorbs a specific wavelength has also been proposed (Patent Document 2).

JP 2011-199054 A JP 2011-221456 A

  Conventional illuminating devices using such filters only improve the color rendering properties of the irradiation object. For this reason, there is a problem that the other appearance of the irradiation object becomes unnatural.

  The present invention has been made to solve such problems, and provides a lighting device and a lighting fixture that emit illumination light that is excellent in the appearance of other irradiated objects while maintaining high color rendering properties. For the purpose.

  In order to achieve the above object, one embodiment of a lighting device according to the present invention includes a first emission peak intensity in a wavelength range of 440 nm to 465 nm and a first emission peak intensity in a wavelength range of 600 nm to 640 nm. A light source having a solid-state light emitting element that emits light of an emission spectrum having a large second emission peak intensity, and a filter that is disposed on the light emission side of the light source and has an absorption characteristic in a wavelength range of 580 nm to 600 nm. The light from the light source that has passed through the filter has a Duv indicating a color deviation of -10 or more and 0 or less, a Ra indicating an average color rendering index of 90 or more, and a PS indicating a skin color preference index. The FCI is 90 or more, and the FCI indicating the conspicuous index is 120 or more.

  While maintaining high color rendering properties, it emits illumination light that is also excellent for the appearance of other irradiated objects.

FIG. 1 is a diagram schematically illustrating a schematic configuration of a lighting apparatus according to an embodiment. FIG. 2 is a diagram illustrating an emission spectrum of a light source in the illumination device according to the embodiment. FIG. 3 is a diagram illustrating an absorption spectrum of a filter in the illumination device according to the embodiment. FIG. 4 is a diagram illustrating an optical spectrum of light from a light source that has passed through a filter in the illumination device according to the embodiment. FIG. 5 is an external perspective view of a lighting fixture including the lighting device according to the embodiment. FIG. 6 is a diagram illustrating an example of a specific configuration of the lighting apparatus according to the embodiment. FIG. 7 is an exploded perspective view when the illumination device according to the embodiment is viewed from below. FIG. 8A is a cross-sectional view of the lighting apparatus according to the embodiment. FIG. 8B is a bottom view of the lighting apparatus according to the embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, component arrangement positions, connection forms, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment)
[Schematic configuration of lighting device]
First, a schematic configuration of the illumination device 1 according to the embodiment will be described with reference to FIG. FIG. 1 is a diagram schematically illustrating a schematic configuration of a lighting apparatus 1 according to an embodiment.

  As shown in FIG. 1, the lighting device 1 includes a light source 10, a filter 20, and an optical member 30. The light source 10 emits white light having a predetermined emission spectrum. The filter 20 is disposed on the light emission side of the light source 10. The optical member 30 is disposed between the light source 10 and the filter 20. In the illumination device 1, the light emitted from the light source 10 passes through the optical member 30 and the filter 20 and is emitted as illumination light.

  The optical member 30 is not necessarily provided. The lighting device 1 may include a power supply circuit for generating power for causing the light source 10 to emit light and supplying the power to the light source 10.

  Hereinafter, each structural member of the illuminating device 1 in this Embodiment is demonstrated in detail.

[light source]
The light source 10 emits light having an emission spectrum having a first emission peak intensity in a wavelength range of 440 nm to 465 nm and a second emission peak intensity greater than the first emission peak intensity in a wavelength range of 600 nm to 640 nm. It has a solid light emitting element that emits light.

  The light source 10 in the present embodiment emits light having an emission spectrum (spectral distribution) shown in FIG. FIG. 2 is a diagram illustrating an emission spectrum of the light source 10 in the illumination device 1 according to the embodiment.

  As shown in FIG. 2, in the emission spectrum of the light source 10, the peak wavelength of the first emission peak intensity (P1) is 455 nm, and the peak wavelength of the second emission peak intensity (P2) is 600 nm.

  In addition, the second emission peak intensity (P2) is larger than the first emission peak intensity (P1). When the second emission peak intensity (P2) is 100%, the first emission peak intensity (P1) is preferably 20% to 60%, and is about 45% in FIG.

  In the present embodiment, the light source 10 is an LED light source having an LED element as a solid light emitting element, for example. Specifically, the light source 10 is a white LED light source that emits white light.

  The LED element in the light source 10 is composed of, for example, an LED chip and a wavelength conversion material such as a phosphor.

  The LED chip is a bare chip that emits monochromatic visible light, and emits light with a predetermined DC power. For example, a blue LED chip that emits blue light when energized is used as the LED chip. The blue LED chip can be made of, for example, a gallium nitride-based semiconductor material, and has a main light emission peak in a wavelength region of, for example, 380 nm to 500 nm. In this case, the peak wavelength of the first emission peak intensity (P1) in the emission spectrum of the light source 10 corresponds to the peak wavelength of the blue LED chip.

  The phosphor is excited by light emitted from the LED chip and emits light of a desired color (wavelength). That is, the phosphor emits fluorescence by the light (excitation light) of the LED chip serving as the excitation light source. The type of phosphor can be selected so that the peak wavelength of the synthesized light by the phosphor corresponds to the peak wavelength of the second emission peak intensity (P2) in the emission spectrum of the light source 10.

  When a blue LED chip is used as an excitation light source, in order to obtain white light, for example, a yellow phosphor having a main emission peak in a wavelength range of 545 nm to 595 nm can be used. In the present embodiment, in order to improve the color rendering properties, for example, a red phosphor having a main emission peak in a wavelength region of 560 nm to 700 nm is also added. These phosphors are contained in a translucent resin material such as a silicone resin, and are configured as phosphor-containing resins. In addition, the kind of fluorescent substance is not restricted to these fluorescent substances.

  Thus, the LED element in the light source 10 is a BY type white LED element constituted by a blue LED chip and a yellow phosphor. In this case, since the yellow phosphor is excited by the blue light emitted from the blue LED chip and emits yellow light, the yellow light from the phosphor and the blue light from the blue LED chip are mixed to form white light, which is emitted from the LED element. Emits white light. Furthermore, in the present embodiment, a red phosphor is added. As a result, the red phosphor is excited by the blue light emitted from the blue LED chip and emits red light, so that the red light becomes white light in which red light is mixed with white light of yellow light and blue light. Note that a green phosphor may be added instead of or together with the red phosphor.

  In addition, as a structure of the LED element which comprises the light source 10, either a COB (Chip On Board) structure and a SMD (Surface Mount Device) structure may be sufficient. Further, instead of the red phosphor and the green phosphor, the LED element may be configured by using a red LED chip that emits red light and a green LED chip that emits green light, or a plurality of types without using a phosphor. The LED element may be composed of only the LED chip.

  As the LED element constituting the light source 10, for example, an LED for illumination (CLL 020-1202A1-273M1A2: manufactured by Citizen Electronics Co., Ltd.) can be used.

[filter]
The filter (filter element) 20 is a light-transmitting component having absorption characteristics in a part of the visible light wavelength range. That is, the filter 20 is a wavelength selection member that selectively absorbs a specific wavelength in a part of the visible light range, and the light color of the light that is transmitted by selectively absorbing the specific wavelength of the light transmitted through the filter 20. It has a function to change.

  The filter 20 in the present embodiment has an absorption characteristic in a wavelength range of 580 nm to 600 nm, and has, for example, an absorption spectrum shown in FIG. FIG. 3 is a diagram illustrating an absorption spectrum of the filter 20 in the illumination device 1 according to the embodiment.

  As shown in FIG. 3, the filter 20 has a maximum absorption wavelength in the range of 580 nm to 600 nm, selectively absorbs wavelengths in the range of 580 nm to 600 nm, and transmits other light. That is, the filter 20 cuts a wavelength component of 580 nm or more and 600 nm or less of the transmitted light. Specifically, the total light transmittance of the maximum absorption wavelength (λmax) in the wavelength range of 580 nm to 600 nm for the filter 20 is 30% to 50%. As shown in FIG. 3, in the present embodiment, the maximum absorption wavelength of the filter 20 is 590 nm, and the total light transmittance at the maximum absorption wavelength is about 33%.

  The filter 20 disposed on the light emission side of the light source 10 selectively absorbs a wavelength component of 580 nm or more and 600 nm or less in the light emitted from the light source 10. In the present embodiment, the light from the light source 10 after passing through the filter 20 has a light spectrum (spectral distribution) shown in FIG. FIG. 4 is a diagram illustrating an optical spectrum of light from the light source 10 that has passed through the filter 20 in the illumination device 1 according to the embodiment.

  As shown in FIG. 4, the light spectrum of the light from the light source 10 that has passed through the filter 20 is a spectrum that combines the emission spectrum of the light source 10 shown in FIG. 2 and the absorption spectrum of the filter 20 shown in FIG. .

  The filter 20 is a dye-added filter to which a wavelength-selective absorbing dye is added as a wavelength-selective absorbing material. That is, all or part of the filter 20 contains a wavelength selective absorption dye as a wavelength selective absorber. In the present embodiment, the absorption spectrum of this wavelength selective absorption dye is the absorption spectrum shown in FIG.

  The filter 20 can be comprised with the resin composition containing a wavelength selective absorption pigment | dye, for example.

  Specifically, the filter 20 can be produced by adding a predetermined amount of a wavelength-selective absorbing dye to the light transmissive resin. In this case, the light transmissive resin is a binder resin, and the filter 20 can be manufactured by making a compound in which a wavelength selective absorption dye is dispersed in the light transmissive resin into a predetermined shape.

  The filter 20 does not disperse the wavelength selective absorption dye in the light transmissive resin, but applies a material containing the wavelength selective absorption dye on the surface of the transparent substrate made of the light transmissive resin and cures it. Can also be made. The surface on which the material containing the wavelength selective absorption pigment is applied may be the surface on the light source 10 side or the surface on the opposite side to the light source 10. Note that the transparent substrate may be made of glass instead of resin.

  The wavelength selective absorption dye constituting the filter 20 is a dye having a property of selectively absorbing a part of the wavelength component in the visible light range. The wavelength selective absorption dye in the present embodiment has absorption characteristics in a wavelength range of 580 nm to 600 nm. That is, the wavelength selective absorption dye selectively absorbs a wavelength component in the range of 580 nm to 600 nm.

  Examples of the wavelength selective absorption dye include dyes mainly composed of organic compounds such as tetraazaporphyrin, tetraphenylporphyrin, octaethylporphyrin, phthalocyanine, cyanine, azo, pyromethene, squarylium, xanthene, dioxane, and oxonol.

  Among these, tetraazaporphyrin compounds can be suitably used because they have a steep absorption peak shape and high fastness to light irradiation from a light source. The tetraazaporphyrin compound is represented by the following chemical formula, for example.

  The central metal (M) of the tetraazaporphyrin compound is at least one selected from copper, cobalt and nickel. The maximum absorption wavelength varies depending on the type of central metal and the type of substituent.

  The filter 20 in the present embodiment contains a dye made of a tetraazaporphyrin compound as a wavelength selective absorption dye. Specifically, a tetraazaporphyrin dye (manufactured by Yamada Chemical Co., Ltd.) made of a tetraazaporphyrin compound having nickel as the central metal was used as the wavelength selective absorption dye.

  The light transmissive resin constituting the filter 20 is a resin having a property of transmitting visible light. Specifically, the light transmissive resin is an optically transparent transparent resin and has a transmittance of 80% or more, preferably 95% or more in the entire wavelength region of the visible light region (400 nm to 700 nm). . The transparent resin may be either a thermoplastic resin or a thermosetting resin.

  Examples of the thermoplastic resin include butyral resin, styrene-maleic acid copolymer, chlorinated polyethylene, chlorinated polypropene, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyurethane resin, and polyester. Examples thereof include resins, acrylic resins, alkyd resins, polystyrene resins, polyamide resins, rubber resins, cyclized rubber resins, celluloses, polyethylene resins, polybutadiene resins, and polyimide resins. In addition, polymethyl methacrylate, polycarbonate, cyclic polyolefin, cyclic polyolefin copolymer, polymethylpentene, etc. may be used as the thermoplastic resin.

  Examples of the thermosetting resin include an epoxy resin, a benzoguanamine resin, a rosin-modified maleic acid resin, a rosin-modified fumaric acid resin, a melamine resin, a urea resin, and a phenol resin. Among them, an acrylic resin is preferably used from the viewpoint of transparency. In addition, as the thermosetting resin, a methacrylic acid resin or a silicone resin may be used. For example, after the crosslinking component is added, the thermosetting resin is solidified by applying energy such as heat, electron beam, or ultraviolet rays.

  Further, in order to suppress the fading of the pigment due to light irradiation from the light source 10, the light-transmitting resin constituting the filter 20 includes an antioxidant, light, and the like within a range that does not impair the wavelength selective absorption function of the filter 20. You may add well-known additives, such as a stabilizer or a ultraviolet absorber.

  As the antioxidant, a phenol-based antioxidant, an amine-based antioxidant, a phosphorus-based antioxidant, a sulfur-based antioxidant, or the like can be used. In particular, phenol-based antioxidants and amine-based antioxidants are preferably used, and hindered amines are preferably used among the amine-based antioxidants. In addition, antioxidant is not restricted to these, A well-known thing can be especially used without a restriction | limiting.

  As the light stabilizer, for example, a hindered amine light stabilizer (HALS) is preferably used as the radical scavenger.

  Examples of the ultraviolet absorber include benzotriazole-based, benzophenone-based, and triazine-based ultraviolet absorbers. In particular, when a tetraazaporphyrin-based dye is used as a wavelength-selective absorbing dye, a benzotriazole-based ultraviolet absorber. Are preferably used. The tetraazaporphyrin-based dye has an absorption band called a Soret band due to its molecular structure in the vicinity of 340 nm, which is almost coincident with the maximum absorption wavelength of benzotriazole-based ultraviolet absorbers of 340 nm to 350 nm. For this reason, the discoloration by the light absorption of the wavelength selective absorption dye can be effectively suppressed by adding the benzotriazole ultraviolet absorber.

  The filter 20 in which the wavelength selective absorption pigment is dispersed in the light transmissive resin can be produced by, for example, the following method.

  First, a predetermined amount of a binder resin made of a light-transmitting resin is weighed, and melted and kneaded at a temperature of 260 ° C. to 280 ° C. in a biaxial kneader / extruder to produce a binder compound pellet containing a wavelength selective absorption dye and the like To do.

  Next, the pellets of the binder compound are put into an injection molding machine, and the filter 20 is produced by injection molding the binder compound into a predetermined shape at a cylinder temperature of 250 ° C. to 270 ° C. and a mold temperature of 60 ° C. Can do. The molding means is not limited to injection molding, and may be molded into a predetermined shape using molding means such as extrusion molding, press molding, cast molding, or calendar molding.

  In the present embodiment, the filter 20 having the absorption spectrum shown in FIG. 3 was produced by this method. An acrylic resin (VH001: manufactured by Mitsubishi Rayon Co., Ltd.) was used as the light transmissive resin, and 3.0 ppm of a tetraazaporphyrin-based dye having a central metal of nickel as a wavelength selective absorption dye was added to the acrylic resin. The shape of the filter 20 was a disk shape having an outer diameter φ of 30 mm and a plate thickness t of 1.5 mm.

  Moreover, the absorption spectrum of the produced filter 20 was measured with a spectrophotometer (U4100: manufactured by Hitachi High-Technologies Corporation). Specifically, the total light transmittance of the filter 20 (sample X) is measured with a spectrophotometer, and the initial transmittance (T0) of the maximum absorption wavelength (595 nm in this embodiment) possessed by the tetraazaporphyrin-based dye. Then, the filter 20 (sample Y) subjected to the light resistance test for 2500 hours was measured in the same manner, and the transmittance (T1) of the maximum absorption wavelength after the light resistance test was calculated. The rate was calculated.

  Residual rate = (TB−T1) / (TB−T0) × 100

In this calculation formula, TB indicates the binder transmittance, and was calculated at TB = 90. In addition, the light resistance (weather resistance) test was performed using a metal weather tester (manufactured by Daipura Wintes Co., Ltd.), the temperature in the tank was 70 ° C., and the light irradiance was 80 mW / cm ² .

  Further, by using this filter 20 and the light source 10 that emits light of the optical spectrum shown in FIG. 2, the spectrum of the light after the light emitted from the light source 10 passes through the filter 20 is converted into an instantaneous multi-photometry system (MCPD-7700). : Otsuka Electronics Co., Ltd.), the spectral distribution (light spectrum) shown in FIG. 4 was obtained.

[Optical member]
The optical member 30 is disposed between the light source 10 and the filter 20. The optical member 30 is, for example, a lens such as a convex lens or a concave lens that imparts a light action such as focusing, divergence, parallelization, or diffusion to the light emitted from the light source 10. As an example, the optical member 30 is a Fresnel lens.

  The optical member 30 is formed of a translucent resin material such as acrylic (PMMA) or polycarbonate (PC).

[Light characteristics of lighting equipment]
Next, the optical characteristics of the illumination device 1 in the present embodiment will be described in comparison with the illumination device of the comparative example.

  The illumination device 1 according to the present embodiment includes a light source 10 that emits light having a light spectrum shown in FIG. 2 and a filter 20 having an absorption spectrum shown in FIG. The light spectrum of the light has a spectral distribution shown in FIG.

  On the other hand, the illumination device of the comparative example has a configuration in which the filter 20 is excluded from the illumination device 1, and other configurations are the same as those of the illumination device 1.

  About lighting device 1 in this embodiment and the lighting device of the comparative example, Duv indicating color deviation, Ra indicating average color rendering index, R9 indicating red special color rendering index with high saturation, and skin color PS (Preference Index of Skin Color) indicating a preference index, FCI (Feeling of Contrast Index) indicating a conspicuous index, and color temperature were measured. The results are shown in Table 1 below.

  The color deviation Duv indicates a deviation from the black body radiation locus. If Duv is within ± 10, white light remains, but if Duv is negative, it is reddish white light (the larger the negative value, the stronger the redness), and Duv is positive. The value is greenish white light (the larger the positive value, the stronger the greenishness).

  The average color rendering index Ra represents the degree of fidelity to the color appearance under the reference light source. The average color rendering index Ra is an average value of eight types of color misregistration evaluated by using a reference light source and a sample light source, and 100 is defined as the maximum value. The higher the value of Ra, the higher the color rendering.

  The special color rendering index R9 is an index indicating the fidelity of the appearance of vivid red among the color rendering indices, and is set to 100 as the highest value. The higher the value of R9, the better the appearance of red.

  The skin color preference index PS represents the degree of preference of the appearance of the skin color of a Japanese woman, and is defined with 100 as the maximum value.

  The conspicuous index (FCI) is an index that represents how vivid the color of the irradiated object is with a certain light source (see New Color Science Handbook [3rd edition] edited by the Japan Color Society). The vividness of the color of the illuminating object is influenced by the conspicuous feeling received from the illuminating object. However, the influence due to the conspicuous feeling cannot be appropriately evaluated only by the average color rendering index Ra. Therefore, the color rendering property of the light source can be more appropriately evaluated by using the conspicuous index FCI which is the evaluation number of the conspicuous feeling. Note that a light source having an FCI greater than 100 can render the color of the irradiated object more vividly than a reference light source, thereby enhancing the noticeability.

  From the results shown in Table 1, the lighting device 1 in the present embodiment has a high skin color preference index and conspicuousness index while maintaining high color rendering properties as compared with the lighting device of the comparative example. An illumination light source excellent in the appearance of an object (irradiation target object) can be realized.

  As described above, according to the illumination device 1 according to the present embodiment, the first emission peak intensity in the wavelength range of 440 nm to 465 nm and the second emission intensity greater than the first emission peak intensity in the wavelength range of 600 nm to 640 nm. A light source 10 having a solid-state light emitting element that emits light of an emission spectrum having an emission peak intensity, and a filter 20 that is disposed on the light emission side of the light source 10 and has an absorption characteristic in a wavelength range of 580 nm to 600 nm. The light from the light source 10 that has passed through the filter 20 has the following optical spectrum (spectral distribution) characteristics.

  Specifically, Duv indicating color deviation is −10 or more and 0 or less, Ra indicating average color rendering index is 90 or more, PS indicating skin color preference index is 90 or more, and the conspicuous index is The indicated FCI is 120 or more.

  According to the illumination device 1 having such light characteristics, it is possible to emit illumination light that is excellent in the appearance of other irradiated objects while maintaining high color rendering properties. For example, human skin can be seen preferably, and meat and planting can be rendered vividly.

  In the present embodiment, the light transmitted through the filter 20 is illumination light emitted from the illumination device 1. Therefore, the optical characteristics of Duv of −10 or more, 0 or less, Ra of 90 or more, PS of 90 or more, and FCI of 120 or more are characteristics of the light spectrum of the illumination light emitted from the illumination device 1.

  In the present embodiment, the light from the light source 10 that has passed through the filter 20 has a low color temperature of 2500 or more and 3000 or less.

  As a result, it is possible to emit illumination light that is even more excellent in the appearance of other irradiated objects while maintaining higher color rendering properties.

  Moreover, in this Embodiment, the filter 20 contains the pigment | dye which consists of a tetraaza porphyrin compound, and the center metal of a tetraaza porphyrin compound is at least 1 type selected from copper, cobalt, and nickel. .

  The compound containing porphyrin has the property that the shape of the absorption peak in the filter 20 can be made steep, and the fastness to light irradiation is high. Therefore, it is possible to realize an illumination device that does not degrade the luminous efficiency as much as possible and that does not degrade the performance for a long time.

  In this case, the central metal of the tetraazaporphyrin compound is preferably nickel.

  Thereby, since durability of the filter 20 with respect to the light irradiation of the light source 10 can be improved, the illuminating device which can suppress performance degradation further can be implement | achieved.

  In the present embodiment, the total light transmittance of the maximum absorption wavelength in the wavelength range of 580 nm to 600 nm for the filter 20 is 30% to 50%.

  Thereby, Ra, PS, and FCI can be further improved.

  Further, an optical member 30 may be disposed between the light source 10 and the filter 20.

  Thereby, the durability of the filter 20 against the light irradiation of the light source 10 can be further improved.

[Application examples of lighting devices]
Next, a specific example of the illumination device 1 according to the embodiment and an application example of the illumination device 1 will be described with reference to FIGS. FIG. 5 is an external perspective view of a lighting fixture 100 including the lighting device 1 according to the embodiment. FIG. 6 is a diagram illustrating an example of a specific configuration of the illumination device 1. FIG. 7 is an exploded perspective view of the illumination device 1 when viewed from below. FIG. 8A is a cross-sectional view of the illumination device 1, and FIG. 8B is a bottom view of the illumination device 1. In the following description, the Z axis + side in the figure is expressed as “upper side”, and the Z axis − side in the figure is expressed as “lower side”. “Lower side” is also described as the light emitting side.

  As shown in FIG. 5, the lighting fixture 100 is a ceiling light attached to the ceiling. The lighting fixture 100 includes a main body 110 and three lighting devices 1 arranged at equal intervals on the outer edge portion of the main body 110. Although not shown, the main body 110 includes a light source that emits illumination light that illuminates the entire room.

  In the present embodiment, each of the three lighting devices 1 is a spotlight for further locally illuminating the room illuminated by the main body 110 of the lighting fixture 100. The lighting device 1 emits light by DC power supplied from a power supply circuit built in the main body 110.

  As illustrated in FIGS. 6 to 8B, the lighting device 1 includes a light source 10, a filter 20, an optical member 30, a housing 40 (first housing 41 and second housing 42), and a cylindrical body 50. And a housing holding unit 60.

  The light source 10 is a light emitting module that emits white light having an optical spectrum shown in FIG. The light emitted from the light source 10 passes through the optical member 30 and the filter element 20 in this order and is emitted to the outside of the illumination device 1. As shown in FIG. 7, specifically, the light source 10 includes a substrate 11 and a light emitting unit 12.

  The substrate 11 has a first main surface (Z-axis-side main surface). A plurality of LED elements constituting the light emitting unit 12 are mounted on the first main surface of the substrate 11. A wiring pattern for supplying power to the plurality of LED elements is formed on the first main surface of the substrate 11. The substrate 11 is, for example, a ceramic substrate, a resin substrate, a metal base substrate, or the like.

  The light emitting unit 12 includes a plurality of LED elements. The emission spectrum of each LED element has a spectral distribution shown in FIG.

  As shown in FIGS. 7 and 8A, the filter 20 is provided between the light source 10 in the housing 40 and the emission port 42a. Specifically, the filter 20 closes the emission port 42 a from the inside of the housing 40. The filter 20 is disposed between the optical member 30 and the emission port 42a. Specifically, the filter 20 is disposed in contact with the surface of the optical member 30. The filter 20 has an absorption spectrum shown in FIG.

  The optical member 30 is disposed between the light source 10 and the filter 20. The optical member 30 is a lens that imparts a light action to the light emitted from the light source 10, and is, for example, a Fresnel lens. The planar shape of the optical member 30 is substantially circular (a part of which is cut off from the outer peripheral side), and an annular prism is provided on the incident surface (the surface on the Z axis + side) of the optical member 30. Yes.

  The optical member 30 may be provided with dimples for suppressing unevenness of light emitted from the optical member 30. In this case, the dimples are provided, for example, on the exit surface (the Z-axis-side surface) of the lens.

  As illustrated in FIG. 8A, the housing 40 houses the light source 10, the filter 20, the optical member 30, and the cylindrical body 50. The housing 40 is, for example, an outer housing having a substantially spherical outer shape. The housing 40 includes a first housing 41 and a second housing 42.

  As shown in FIGS. 7 and 8A, the first housing 41 is a portion of the housing 40 having a support base 41a to which the light source 10 is connected (placed). The first housing 41 is made of a metal material such as aluminum. Since the first housing 41 also functions as a heat sink for the light source 10, it is preferably formed of a metal material, but may be formed of a resin material having high thermal conductivity. In addition, you may provide a thermal radiation member (silicone for thermal radiation, a thermal radiation sheet, etc.) between the light source 10 and the support stand 41a.

  As shown in FIGS. 6, 7, 8 </ b> A, and 8 </ b> B, the second housing 42 is a portion of the housing 40 having an emission port 42 a through which light from the light source 10 is emitted from the housing 40. The emission port 42a is, for example, a circular opening. In the present embodiment, the diameter of the emission port 42 a is smaller than the diameter of the filter 20. For example, the second housing 42 is formed of an insulating resin material such as PBT (polybutylene terephthalate), but may be formed of a metal material.

  The first casing 41 and the second casing 42 are fixed by, for example, screws (not shown) inserted from above (Z axis + side), but the first casing 41 and the second casing are fixed. The fixing means with 42 is not limited to this.

  As shown in FIGS. 7 and 8A, the cylindrical body 50 is a substantially cylindrical member disposed inside the housing 40. Specifically, the cylindrical body 50 is disposed between the light source 10 and the optical member 30. The cylindrical body 50 includes a first opening 51 provided on the light source 10 side and a second opening 52 that is an opening communicating with the first opening 51 and provided on the optical member 30 side. The inner diameter of the first opening 51 is smaller than the inner diameter of the second opening 52. The light source 10 is disposed so as to close the first opening 51, and the optical member 30 is disposed so as to close the second opening 52. The cylinder 50 is formed of an insulating resin material such as PBT, for example, but may be formed of a metal material.

  The outer wall of the cylindrical body 50 is provided with an attachment portion formed with a screw insertion hole for fixing the cylindrical body 50 to the first housing 41 with a screw. The cylindrical body 50 is attached to the first housing 41 by inserting a screw into the screw insertion hole from below (Z axis-side).

  The inner diameter of the first opening 51 of the cylindrical body 50 is slightly larger than the diameter of the light emitting unit 12. Further, the inner diameter (diameter) of the second opening 52 of the cylindrical body 50 is smaller than the diameter of the optical member 30 and slightly smaller than the diameter of the filter 20.

  As shown in FIGS. 6, 7, and 8 </ b> A, the housing holding unit 60 holds the housing 40 in a state in which the posture of the housing 40 (light irradiation direction of the lighting device 1) can be changed. It is. The housing holding part 60 is provided with, for example, a hemispherical recess, and the housing 40 is held in a state where a part of the housing 40 (mainly the first housing 41) is accommodated in the recess. The housing holding unit 60 is formed of, for example, a resin material, but may be formed of a metal material. In addition, the housing | casing holding | maintenance part 60 is located inside the lighting fixture 100 in the state in which the illuminating device 1 was integrated in the lighting fixture 100, and is not visually recognized from the exterior.

  As described above, the lighting fixture 100 according to the present embodiment includes the lighting device 1 including the light source 10 and the filter 20.

  Thereby, the lighting fixture 100 emits illumination light excellent in the appearance of other irradiated objects while maintaining high color rendering properties when the lighting device 1 is lit alone.

(Other variations)
As mentioned above, although the illuminating device and lighting fixture which concern on this invention were demonstrated based on embodiment, this invention is not limited to the said embodiment.

  For example, in the above embodiment, an LED element is used as the solid light emitting element in the light source 10, but a solid light emitting element such as an organic EL element (OLED) or an inorganic EL element may be used instead of the LED element.

  Moreover, in the said embodiment, although the ceiling light was demonstrated as an application example of the illuminating device 1, it is not limited to this, In the range which does not impair the objective of this invention, other lighting fixtures other than a ceiling light It can also be applied to. In addition, the lighting device 1 is not installed as an accessory and the lighting device 1 is used for auxiliary lighting, but a lighting fixture using the lighting device 1 as main illumination may be used, or only the lighting device 1 is used as a light source. It may be a lighting fixture.

  It should be noted that any other form obtained by subjecting each embodiment and modification to various modifications conceived by those skilled in the art, and any combination of constituent elements and functions in the embodiment without departing from the spirit of the present invention. The embodiment realized by the above is also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Illuminating device 10 Light source 20 Filter 30 Optical member 100 Lighting fixture

Claims (7)

A solid that emits light having an emission spectrum having a first emission peak intensity in a wavelength range of 440 nm to 465 nm and a second emission peak intensity greater than the first emission peak intensity in a wavelength range of 600 nm to 640 nm. A light source having a light emitting element;
A filter disposed on the light exit side of the light source and having an absorption characteristic in a wavelength range of 580 nm to 600 nm,
The light from the light source that has passed through the filter has a Duv indicating a color deviation of −10 or more and 0 or less, Ra indicating an average color rendering index of 90 or more, and PS indicating a skin color preference index of 90 or more. There is a lighting device that has an FCI of 120 or more that shows a conspicuous index. The lighting device according to claim 1, wherein the light transmitted through the filter has a color temperature of 2500 or more and 3000 or less. The filter contains a dye composed of a tetraazaporphyrin compound,
The lighting device according to claim 1 or 2, wherein a central metal of the tetraazaporphyrin compound is at least one selected from copper, cobalt, and nickel. The lighting device according to claim 3, wherein a central metal of the tetraazaporphyrin compound is nickel. The illuminating device according to any one of claims 1 to 4, wherein the filter has a total light transmittance of a maximum absorption wavelength in a wavelength range of 580 nm to 600 nm in a range of 30% to 50%. Furthermore, the illuminating device of any one of Claims 1-5 provided with the optical member arrange | positioned between the said light source and the said filter. A lighting fixture comprising the lighting device according to any one of claims 1 to 6.

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