JP2019109981A - Light fitting - Google Patents

Abstract

To provide a light fitting capable of easily bringing a spectrum of emitted light to a design target.SOLUTION: A lighting fixture 10 includes: a light source 12; a first optical filter 15 including a light-emitting material that emits light by absorbing light of a first wavelength range; and a second optical filter 16 including an absorbing material that absorbs light of a second wavelength range. One of the first optical filter 15 and the second optical filter 16 is positioned between the other one of the first optical filter 15 and the second optical filter 16 and the light source 12.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a luminaire including an optical filter that cuts off light in a partial wavelength range.

  In recent years, lighting fixtures using LEDs (Light Emitting Diodes) are becoming widespread. As such a lighting fixture, Patent Document 1 discloses a light emitting device that can be made compact.

JP 2008-270786 A

  By the way, in a lighting fixture, it may be difficult to make the spectrum of emitted light approach a design target.

  The present invention provides a luminaire that makes it easy to bring the spectrum of emitted light close to the design goal.

  A luminaire according to one aspect of the present invention includes a light source, a first optical filter including a light emitting material that emits light by absorbing light in a first wavelength range, and an absorbing material that absorbs light in a second wavelength range. A second optical filter is provided, and one of the first optical filter and the second optical filter is located between the other of the first optical filter and the second optical filter and the light source.

  According to the present invention, it is possible to realize a luminaire that makes it easy to bring the spectrum of emitted light close to the design target.

FIG. 1 is an external perspective view of the lighting apparatus according to the first embodiment. FIG. 2 is an exploded perspective view of the lighting apparatus according to the first embodiment. FIG. 3 is a schematic cross-sectional view of the luminaire according to the first embodiment. FIG. 4 is a diagram showing the spectrum of white light emitted by the light source. FIG. 5 is a diagram showing the characteristics of a first optical filter including a perylene derivative as a light emitting material. FIG. 6 is a diagram showing light transmission characteristics of a second optical filter including a tetraazaporphyrin compound as an absorbing material. FIG. 7 is a diagram showing the spectrum of the light emitted from the lighting apparatus according to Embodiment 1. FIG. 8 is a schematic cross-sectional view of the luminaire according to the second embodiment. FIG. 9 is a diagram showing a change in spectrum of emitted light when the lighting fixture according to Embodiment 1 emits light for 40,000 hours. FIG. 10 is a diagram showing a change in spectrum of emitted light when the lighting apparatus according to Embodiment 2 emits light for 40,000 hours. FIG. 11 is a diagram showing the change from the initial value of the chromaticity of the emitted light of the lighting fixture after emitting light for 40,000 hours. FIG. 12 is a schematic cross-sectional view of a first example of the wavelength control element according to the third embodiment. FIG. 13 is a schematic cross-sectional view of a second example of the wavelength control element according to the third embodiment. FIG. 14 is a schematic cross-sectional view of a third example of the wavelength control element according to the third embodiment. FIG. 15 is a schematic cross-sectional view of a fourth example of the wavelength control element according to the third embodiment.

  Embodiments will be specifically described below with reference to the drawings. The embodiments described below are all inclusive or specific examples. Numerical values, shapes, materials, components, arrangement positions and connection forms of the components, and the like described in the following embodiments are merely examples, and are not intended to limit the present invention. Further, among the components in the following embodiments, components not described in the independent claim indicating the highest concept are described as arbitrary components.

  Each drawing is a schematic view and is not necessarily strictly illustrated. Further, in the drawings, substantially the same configurations are denoted by the same reference numerals, and overlapping descriptions may be omitted or simplified.

Embodiment 1
[Constitution]
Hereinafter, the configuration of the lighting apparatus according to Embodiment 1 will be described. FIG. 1 is an external perspective view of the lighting apparatus according to the first embodiment. FIG. 2 is an exploded perspective view of the lighting apparatus according to the first embodiment. FIG. 3 is a schematic cross-sectional view of the luminaire according to the first embodiment.

  As shown in FIG. 1, the lighting fixture 10 according to the first embodiment is a spotlight for illuminating an indoor space and the like. Specifically, the luminaire 10 includes a main body 11, a light source 12, a reflector 13, a lens 14, a first optical filter 15, and a second optical filter 16.

  The main body 11 has a substantially cylindrical outer shape, and accommodates the light source 12, the reflector 13, the lens 14, the first optical filter 15, and the second optical filter 16 in a space provided on the light emission side. The main body 11 is formed of, for example, a resin material, but part or all of the body 11 may be formed of a metal material.

  The light source 12 is, for example, a COB (Chip On Board) type light emitting module in which a plurality of LED chips mounted on a substrate is sealed by a sealing member. The plan view shape of the substrate is, for example, rectangular, and the plan view shape of the light emitting region on the substrate on which the sealing member is formed is, for example, circular.

  Each of the plurality of LED chips is, for example, a gallium nitride-based LED chip having an emission peak wavelength of 430 nm or more and 480 nm or less, which is made of an InGaN-based material, and emits blue light. The sealing member is made of a translucent resin material containing a yellow phosphor as a wavelength conversion material. As a translucent resin material, although a silicone resin is used, for example, an epoxy resin or a urea resin may be used. Further, for example, a YAG-based phosphor is adopted as the yellow phosphor, but a LuAG-based phosphor may be adopted.

  In the light source 12, part of the blue light emitted from the plurality of LED chips is wavelength-converted to yellow light by the yellow phosphor contained in the sealing member. The blue light not absorbed by the yellow phosphor and the yellow light wavelength-converted by the yellow phosphor are diffused and mixed in the sealing member. Thereby, white light is emitted from the light source 12. FIG. 4 is a diagram showing the spectrum of white light emitted by the light source 12. The vertical axis in FIG. 4 indicates the light intensity, and the horizontal axis indicates the wavelength of light.

  In addition to the yellow phosphor, a red phosphor, a green phosphor, and the like may be contained in the light-transmitting resin material for the purpose of enhancing color rendering and the like. The translucent resin material may contain a green phosphor instead of the yellow phosphor.

  The reflecting plate 13 is a member having a light reflecting function, and has an entrance that is an opening through which light emitted by the light source 12 is incident, and an exit that is an opening through which light incident from the entrance is emitted. The reflection plate 13 is a cylindrical member configured such that the inner diameter increases from the entrance to the exit.

  The inner surface of the reflecting plate 13 is a reflecting surface that reflects the light emitted by the light source 12. The reflective surface reflects the light incident from the entrance and emits the light from the exit. The reflecting plate 13 is formed of, for example, a white resin material. The inner surface of the reflection plate 13 may be coated with a metal deposition film (metal reflection film) made of a metal material such as silver or aluminum. Further, the reflecting plate 13 may be formed using a metal material such as aluminum having a higher reflectance than a resin material. A lens 14 is disposed at the exit of the reflection plate 13.

  The lens 14 is an optical element having specific optical characteristics. The lens 14 is a convex lens (more specifically, a Fresnel lens) for diffusing (or collimating) the light emitted from the light source 12. The lens 14 is disposed to face the light source 12. The plan view shape of the lens 14 is substantially circular. The lens 14 is formed of, for example, a resin material such as an acrylic resin or a polycarbonate resin. The light transmitted through the lens 14 is incident on the first optical filter 15.

  The first optical filter 15 is an optical filter that includes a light emitting material that emits light by selectively absorbing light in the first wavelength range. The first optical filter 15 is, in other words, a light emission filter.

  The first optical filter 15 is a disk-shaped optical element having translucency. Specifically, the first optical filter 15 is formed of an acrylic resin containing a fluorescent dye (in other words, a light emitting dye) as the light emitting material. The base material of the first optical filter 15 is not limited to an acrylic resin, and may be another resin material such as a polycarbonate resin. The fluorescent dye is, for example, a perylene derivative. FIG. 5 is a view showing the characteristics of the first optical filter 15 including a perylene derivative as a light emitting material. In FIG. 5, both the emission spectrum and the absorption spectrum of the first optical filter 15 are illustrated. The vertical axis in FIG. 5 indicates the light transmittance or the light intensity, and the horizontal axis indicates the wavelength of the light.

  As shown in FIG. 5, the first optical filter 15 absorbs light in a first wavelength range of 630 nm or less in the visible light range, for example. In addition, the first optical filter 15 emits light over a third wavelength range of, for example, 550 nm or more and 780 nm or less. The first optical filter 15 has an absorption peak of light around 580 nm and an emission peak around 620 nm. That is, the absorption peak wavelength of the light of the first optical filter 15 is shorter than the emission peak wavelength.

  In addition, the luminescent material which the 1st optical filter 15 contains is not limited to a perylene derivative. The light emitting material may be a pigment such as a tetracene derivative, an anthracene derivative or an amine derivative. In addition, the light emitting material is not limited to an organic compound such as a dye, and may be an inorganic compound such as a phosphor. The light transmitted through the first optical filter 15 enters the second optical filter 16.

  The second optical filter 16 is an optical filter that includes an absorbing material that selectively absorbs light in the second wavelength range. The second optical filter 16 is, in other words, an absorption filter.

  The second optical filter 16 is a translucent disk-shaped color filter. Specifically, the second optical filter 16 is formed of an acrylic resin containing a dye as the absorbing material. The base material of the second optical filter 16 is not limited to the acrylic resin, and may be another resin material such as a polycarbonate resin. The pigment used as the absorbing material is a pigment that does not emit light. The dye used as the absorbent material is specifically, for example, a tetraazaporphyrin compound. FIG. 6 is a view showing the light transmission characteristics of the second optical filter 16 containing a tetraazaporphyrin compound as an absorbing material. The vertical axis in FIG. 6 indicates the light transmittance, and the horizontal axis indicates the wavelength of light.

  As shown in FIG. 6, the second optical filter 16 absorbs light in a second wavelength range of, for example, 500 nm or more and 600 nm or less. The second optical filter 16 has an absorption peak of light near 590 nm. In the luminaire 10, the second wavelength range overlaps the first wavelength range. That is, part of the second wavelength range is included in the first wavelength range.

  The tetraazaporphyrin compound contains, for example, a metal element such as copper (Cu), nickel (Ni), or cobalt (Co). The absorbing material contained in the second optical filter 16 may be a pigment other than the tetraazaporphyrin compound. The absorbing material may be a dye such as a porphyrin derivative, a methine dye, a merocyanine compound, or a phthalocyanine compound.

  As described above, the luminaire 10 includes both the first optical filter 15 and the second optical filter 16. Thus, the designer designs the spectrum of the emitted light by adjusting the type and amount of light emitting material contained in the first optical filter 15 and the type and amount of absorbing material contained in the second optical filter 16. It can be driven to the goal. Therefore, it can be said that the luminaire 10 is a luminaire that is easier to bring the spectrum of the emitted light closer to the design target than a luminaire provided with only the first optical filter 15 or the second optical filter 16. FIG. 7 is a diagram showing the spectrum of the light emitted from the lighting apparatus 10. As shown in FIG. The vertical axis in FIG. 7 indicates the light intensity, and the horizontal axis indicates the wavelength.

  In the luminaire 10, the first optical filter 15 is located between the second optical filter 16 and the light source 12. That is, the first optical filter 15 is positioned closer to the light source 12 than the second optical filter 16. Therefore, after the white light having the spectrum of FIG. 4 passes through the first optical filter 15 having the characteristic of FIG. 5, the spectrum shown by the solid line in FIG. It is a spectrum of the emitted light of the lighting fixture 10 obtained by transmitting through the filter 16.

  In the spectrum of FIG. 7, the light intensity in the wavelength range around 580 nm is relatively reduced. As a result, the lighting fixture 10 with an improved preference index of skin color (PS) or the like indicating the preference of skin color is realized. The spectrum of FIG. 7 is an example, and a combination of the light emitting material contained in the first optical filter 15 and the absorbing material contained in the second optical filter 16 realizes various spectra of emitted light.

  Further, in the luminaire 10, the first optical filter 15 contains only the light emitting material among the light emitting material and the absorbing material, and the second optical filter 16 contains only the absorbing material among the light emitting material and the absorbing material. ing. As a result, compared to the optical filter in which both the light emitting material and the absorbing material are mixed, stable characteristics can be given to each of the first optical filter 15 and the second optical filter 16. The first optical filter 15 may include a plurality of light emitting materials. The second optical filter 16 may include multiple types of absorbing materials.

  By the way, the spectrum shown by a broken line in FIG. 7 is a spectrum of the emitted light of the luminaire according to the comparative example in which the second optical filter 16 is positioned closer to the light source 12 than the first optical filter 15. The lighting fixture according to the comparative example differs only in the arrangement of the lighting fixture 10, the first optical filter 15, and the second optical filter 16.

  When the first wavelength range that is the light absorption range of the first optical filter 15 and the second wavelength range that is the light absorption range of the second optical filter 16 overlap, as in the lighting device according to the comparative example, When the light emitted from the light source 12 enters the second optical filter 16 earlier than the first optical filter 15, the amount of light absorbed by the first optical filter 15 decreases. When the light absorption amount of the first optical filter 15 decreases, the light emission amount of the first optical filter 15 also decreases accordingly.

  On the other hand, in the lighting device 10, since the light emitted by the light source 12 is incident on the first optical filter 15 before the second optical filter 16, the light emission amount of the first optical filter 15 can be secured. Therefore, as shown in FIG. 7, in the spectrum of the emitted light of the lighting apparatus 10 (solid line in FIG. 7), compared to the spectrum of the emitted light of the lighting apparatus according to the comparative example (dotted line in FIG. 7) The light intensity is high, and the utilization efficiency of the light emitted from the light source 12 is improved.

Second Embodiment
The lighting apparatus according to the second embodiment will be described below. FIG. 8 is a schematic cross-sectional view of the luminaire according to the second embodiment. In the second embodiment below, the description will be made focusing on the differences from the first embodiment, and the descriptions of the above-described matters will be omitted as appropriate.

  As shown in FIG. 8, the luminaire 10 a according to the second embodiment differs from the luminaire 10 in the arrangement of the first optical filter 15 and the second optical filter 16. In the luminaire 10 a, the second optical filter 16 is located closer to the light source 12 than the first optical filter 15. That is, the second optical filter 16 is located between the first optical filter 15 and the light source 12.

  The luminaire 10 a has a smaller change in chromaticity of emitted light than after the luminaire 10 even after a long time of use. Hereinafter, the change in chromaticity of the emitted light after use for 40,000 hours will be described with reference to the drawings. FIG. 9 is a diagram showing a change in the spectrum of the emitted light when the lighting apparatus 10 is caused to emit light for 40,000 hours. FIG. 10 is a diagram showing a change in the spectrum of the emitted light when the lighting fixture 10a is caused to emit light for 40,000 hours. FIG. 11 is a diagram showing the change from the initial value of the chromaticity of the emitted light of the lighting device 10 after emitting 40,000 hours and the chromaticity of the emitting light of the lighting device 10a after emitting 40,000 hours.

  In (a) of FIG. 9 and (a) of FIG. 10, the initial state of the spectrum of the emitted light of the luminaire 10 and the luminaire 10 a is shown by a thick line, and the chromaticity of the emitted light at this time is shown in FIG. It corresponds to the "initial value" of. In (b) of FIG. 9, the spectrum of the light emitted from the lighting apparatus 10 after 40,000 hours is shown by a thick line, and the chromaticity of the light at this time corresponds to the “Embodiment 1” of FIG. Do. In (b) of FIG. 10, the spectrum of the light emitted from the luminaire 10a after 40,000 hours is shown by a thick line, and the chromaticity of the emitted light at this time corresponds to “Embodiment 2” of FIG. Do. FIG. 11 is a diagram showing chromaticity coordinates, and the chromaticity of a single light emitted from the light source 12 is also plotted for reference.

  In FIG. 9 and FIG. 10, the characteristics of the first optical filter 15 and the second optical filter 16 are also shown by thin lines in addition to the spectrum of the light emitted from the lighting device 10 and the lighting device 10a. 9 and 10, (1) is an absorption spectrum of light of the first optical filter 15, (2) is an emission spectrum of the first optical filter 15, and (3) is a second optical filter. It is an absorption spectrum of 16 light. In the second embodiment, the absorbing material contained in the second optical filter 16 is a merocyanine compound.

  In general, the second optical filter 16 (that is, the absorption filter) progresses more rapidly than the first optical filter 15 (that is, the emission filter). In the luminaire 10, since the first optical filter 15 is positioned closer to the light source 12 than the second optical filter 16, the deterioration of the second optical filter 16 hardly affects the light emitted from the first optical filter 15. . For this reason, as shown in FIG. 9, the change of the emission spectrum of the first optical filter 15 after the lighting apparatus 10 emits light for 40,000 hours (that is, (2) in FIG. 9A to FIG. The change of)) to (2) is small. In other words, in the luminaire 10, there is no significant change in the spectrum of light incident on the second optical filter 16 from the first optical filter 15 even after emitting 40,000 hours.

  Then, after the lighting apparatus 10 emits light for 40000 hours, the second optical filter 16 is deteriorated and the amount of light absorption is reduced (that is, (3) of FIG. 9A to FIG. (3)), the spectrum of the emitted light changes significantly from the initial state. As shown in FIG. 11, the chromaticity of the spectrum of the light emitted from the lighting apparatus 10 after emitting 40,000 hours is located outside the range of 3 steps of the MacAdam ellipse centered on the initial value. Therefore, the change from the initial value of the chromaticity of the emitted light of the lighting fixture 10 can be recognized by the human eye.

  On the other hand, in the lighting device 10 a, the second optical filter 16 is positioned closer to the light source 12 than the first optical filter 15. For this reason, as shown in FIG. 10, the amount of light absorption of the second optical filter 16 is reduced due to deterioration (that is, (3) in FIG. 10A to (3) in FIG. ), The spectrum of light incident on the first optical filter 15 changes. Then, the change in the emission spectrum of the first optical filter 15 (that is, the change from (2) in (a) of FIG. 10 to (2) in (b) of FIG. 10) becomes relatively large. Specifically, the light emission amount of the first optical filter 15 is increased.

  However, the change in chromaticity due to the decrease in the amount of light absorption of the second optical filter 16 and the change in chromaticity due to the change in emission spectrum of the first optical filter 15 are changes in opposite directions on the chromaticity coordinates. It becomes. That is, the change of the chromaticity due to the decrease of the light absorption amount of the second optical filter 16 and the change of the chromaticity due to the change of the emission spectrum of the first optical filter 15 are offset to some extent.

  As a result, as shown in FIG. 11, the chromaticity of the spectrum of the light emitted from the lighting apparatus 10a after emitting 40,000 hours is located inside the range of 3 steps of the MacAdam ellipse centered on the initial value. Therefore, it is difficult for the human eye to recognize the change from the initial value of the chromaticity of the light emitted from the lighting apparatus 10a.

  Thus, the luminaire 10a in which the second optical filter 16 is positioned between the first optical filter 15 and the light source 12 has an advantage that the change in chromaticity of the emitted light is small even after long time use.

Third Embodiment
In the first embodiment and the second embodiment, the first optical filter 15 and the second optical filter 16 are separate bodies. That is, the first optical filter 15 and the second optical filter 16 are disposed with a gap. Such a configuration has an advantage that the first optical filter 15 and the second optical filter 16 can be individually replaced in the lighting device 10 (or the lighting device 10a).

  However, the first optical filter 15 and the second optical filter 16 may be integrated optical elements. In the following third embodiment, such an integral optical element is defined as a wavelength control element for convenience, and such a wavelength control element will be described. The wavelength control element is an element for controlling the wavelength of light emitted by the light source 12.

  The wavelength control element is formed, for example, by bonding of the first optical filter 15 and the second optical filter 16. FIG. 12 is a schematic cross-sectional view of a first example of the wavelength control element according to the third embodiment.

  In the wavelength control element 20 a shown in FIG. 12, the first optical filter 15 and the second optical filter 16 are bonded by the bonding member 30. Specifically, the main surface of the disk-shaped first optical filter 15 and the main surface of the disk-shaped second optical filter 16 are bonded by the bonding member 30. The thickness of the bonding member 30 is thinner than, for example, the thickness of the first optical filter 15 and the thickness of the second optical filter 16.

  The bonding member 30 is formed of a light transmitting material. In addition, when the base material of the 1st optical filter 15 and the base material of the 2nd optical filter 16 are acrylic resin, it is good for the adhesion member 30 to use an acrylic resin type material. That is, it is preferable that a material having a refractive index close to that of the base of the first optical filter 15 and the base of the second optical filter 16 be used for the adhesive member. Thus, the formation of interfaces between the first optical filter 15 and the adhesive member 30 and between the second optical filter 16 and the adhesive member 30 is suppressed. As a result, the loss of light due to the reflection at the interface decreases, and the light utilization efficiency is improved.

  FIG. 13 is a schematic cross-sectional view of a second example of the wavelength control element according to the third embodiment. In the wavelength control element 20b shown in FIG. 13, the first optical filter 15 and the second optical filter 16 are in direct contact with each other. The first optical filter 15 a is an optical filter having the same function as the first optical filter 15, but the main surface of the second optical filter 16 is coated with the translucent material that is the source of the first optical filter 15 a Are different from the first optical filter 15 in that they are formed. Although the translucent material which becomes the origin of the 1st optical filter 15a is apply | coated by the spin coat method, for example, you may apply by the dispenser method or the inkjet method.

  As a result, the thickness of the first optical filter 15 a becomes thinner than the thickness of the second optical filter 16. In the wavelength control element 20b, the thickness of the first optical filter 15a is, for example, about 50 μm, and the thickness of the second optical filter 16 is, for example, 0.5 mm or more and 2.0 mm or less. That is, the thickness of the first optical filter 15 a is not more than one fifth of the thickness of the second optical filter 16.

  A translucent material that is the source of the second optical filter may be applied to the first optical filter 15. In this case, the thickness of the second optical filter formed by application is thinner than the thickness of the first optical filter 15. Thus, in the case where one of the first optical filter and the second optical filter is formed by application of the translucent material that is the source of the optical filter, the thickness of one of the first optical filter and the second optical filter is And the thickness of the other of the first optical filter and the second optical filter.

  By the way, the optical filter tends to have a longer life as the thickness of the substrate is thicker. As mentioned above, the second optical filter 16 has a relatively shorter life than the first optical filter 15. Therefore, according to the configuration in which the thickness of the first optical filter 15a is thinner than the thickness of the second optical filter 16 as in the wavelength control element 20b, the lifetime of the wavelength control element 20b can be increased.

  Note that both the first optical filter 15 and the second optical filter 16 may be formed by coating. FIG. 14 is a schematic cross-sectional view of a third example of the wavelength control element according to the third embodiment. FIG. 15 is a schematic cross-sectional view of a fourth example of the wavelength control element according to the third embodiment.

  In the wavelength control element 20c shown in FIG. 14, the first optical filter 15a and the second optical filter 16a are stacked on the main surface 41 of the light transmitting substrate 40. Specifically, the second optical filter 16a is formed on the major surface 41 of the substrate 40, and the first optical filter 15a is formed on the second optical filter 16a. The first optical filter 15a and the second optical filter 16a are in direct contact with each other. The first optical filter 15a may be formed on the main surface 41 of the substrate 40, and the second optical filter 16a may be formed on the first optical filter 15a.

  The first optical filter 15a and the second optical filter 16a are both formed by coating. Therefore, the thickness of the first optical filter 15 a and the thickness of the second optical filter 16 a are thinner than the thickness of the substrate 40. The substrate 40 is formed of, for example, a translucent resin material such as an acrylic resin, but may be formed of another resin material such as a polycarbonate resin.

  Further, in the wavelength control element 20d shown in FIG. 15, the first optical filter 15a is provided on one main surface 41 of the light transmitting substrate 40, and the second optical filter is provided on the other main surface 42 of the substrate 40. 16a is provided. That is, in the wavelength control element 20d, the substrate 40 is interposed between the first optical filter 15a and the second optical filter 16a. One main surface 41 and the other main surface 42 are main surfaces facing each other.

  The first optical filter 15a and the second optical filter 16a are both formed by coating. Therefore, the thickness of the first optical filter 15 a and the thickness of the second optical filter 16 a are thinner than the thickness of the substrate 40.

  As described above, in the wavelength control element 20c and the wavelength control element 20d, the first optical filter 15a and the second optical filter 16a can be formed by application of a translucent material.

  The wavelength control element according to the third embodiment described above may be arranged such that the light emitted by the light source 12 enters the first optical filter earlier than the second filter, or the light emitted by the light source 12 May be arranged to be incident on the second optical filter prior to the first optical filter.

  The wavelength control element according to the third embodiment may be realized by providing the first optical filter 15a and the second optical filter 16a on the surface of the lens 14 instead of the substrate 40. In other words, the substrate 40 may have optical properties such as collecting or diffusing light.

(Summary)
As described above, the luminaire 10 includes the light source 12, the first optical filter 15 including the light emitting material that emits light by absorbing the light in the first wavelength range, and the absorbing material that absorbs the light in the second wavelength range And a second optical filter 16 including One of the first optical filter 15 and the second optical filter 16 is located between the other of the first optical filter 15 and the second optical filter 16 and the light source 12.

  Thereby, the designer designs the spectrum of the emitted light by adjusting the type and amount of absorbing material contained in the second optical filter 16 and the type and amount of light emitting material contained in the first optical filter 15 It can be driven to the goal. That is, the luminaire 10 in which the spectrum of the emitted light can be easily brought close to the design target is realized.

  Also, for example, the first optical filter 15 is located between the second optical filter 16 and the light source 12.

  Thus, as described in the first embodiment, when at least a part of the second wavelength range is included in the first wavelength range, etc., the light emission amount of the first optical filter 15 can be secured. . That is, the utilization efficiency of the light emitted from the light source 12 can be improved.

  Also, for example, at least a part of the second wavelength range is included in the first wavelength range.

  Thereby, the light emission amount of the first optical filter 15 can be secured. That is, the utilization efficiency of the light emitted from the light source 12 can be improved.

  In addition, in the luminaire 10 a, the second optical filter 16 is located between the first optical filter 15 and the light source 12.

  As a result, as described in the second embodiment, the lighting apparatus 10a with a small change in the chromaticity of the emitted light even after being used for a long time is realized.

  Also, for example, the first optical filter 15 and the second optical filter 16 are disposed with a gap.

  This makes it easy to replace the first optical filter 15 and the second optical filter 16 individually.

  Further, in the wavelength control element 20 a, for example, the first optical filter 15 and the second optical filter 16 are bonded by the bonding member 30.

  Thus, if a material having a refractive index close to that of the base of the first optical filter 15 and the base of the second optical filter 16 is used for the adhesive member 30, the first optical filter and the second optical filter will The loss of light due to reflection at the interface can be reduced as compared to the case where it is placed open. Therefore, the utilization efficiency of the light which light source 12 emits can be improved.

  In the wavelength control element 20b, the first optical filter 15a and the second optical filter 16 are in direct contact with each other. The same goes for the wavelength control element 20c.

  Thereby, the interface can be reduced as compared with the case where the first optical filter 15a and the second optical filter 16 are disposed with a gap. As a result, the loss of light due to reflection at the interface is suppressed, so the utilization efficiency of light emitted by the light source 12 can be improved.

  In the wavelength control element 20b, the thickness of one of the first optical filter 15a and the second optical filter 16 (specifically, the first optical filter 15a) is the other of the first optical filter 15a and the second optical filter 16. (Specifically, it is thinner than the thickness of the second optical filter 16).

  Thus, by applying the translucent material to the other of the first optical filter 15a and the second optical filter 16, one of the first optical filter 15a and the second optical filter 16 can be formed.

  Moreover, the lighting fixture 10 or the lighting fixture 10a may further be provided with the board | substrate 40 which has translucency. For example, in the wavelength control element 20 c, the first optical filter 15 a and the second optical filter 16 a are stacked on the major surface 41 of the substrate 40.

  Thereby, both the 1st optical filter 15a and the 2nd optical filter 16a can be formed by application | coating of a translucent material.

  Moreover, the lighting fixture 10 or the lighting fixture 10a may further be provided with the board | substrate 40 which has translucency. For example, in the wavelength control element 20 d, the first optical filter 15 a is provided on one main surface 41 of the substrate 40, and the second optical filter 16 a is provided on the other main surface 42 of the substrate 40.

  Thereby, both the first optical filter 15 a and the second optical filter 16 a can be formed by applying a translucent material to the substrate 40.

(Other embodiments)
As mentioned above, although embodiment was described, this invention is not limited to such embodiment.

  For example, in the above embodiment, the lighting apparatus includes one each of the first optical filter and the second optical filter, but may have at least one each of the first optical filter and the second optical filter. That is, the luminaire may comprise a plurality of first optical filters. The luminaire may also comprise a plurality of second optical filters.

  Moreover, in the said embodiment, the lighting fixture was demonstrated as being a spotlight. However, the present invention may be realized as another luminaire comprising a first optical filter and a second optical filter. For example, the present invention may be implemented as a downlight.

  Moreover, the optical system of the lighting fixture demonstrated by the said embodiment is an example. A luminaire having another optical system capable of realizing the characteristic functions of the present invention is also included in the present invention. For example, another optical element may be added to the optical system as long as the same function as the optical system described in the above embodiment can be realized, or some optical elements included in the optical system are It may be omitted.

  Further, in the above embodiment, the light source is a COB type light emitting module, but the light source may be an SMD (Surface Mount Device) type light emitting module.

  In the above embodiment, an LED chip is used as a light emitting element as a light source, but a semiconductor light emitting element such as a semiconductor laser, or a solid light emitting element such as organic EL (Electro Luminescence) or inorganic EL may be used. Good.

  As mentioned above, although the lighting fixture which concerns on one or several aspect was demonstrated based on embodiment, this invention is not limited to this embodiment. Without departing from the spirit of the present invention, various modifications that can be conceived by those skilled in the art may be applied to the present embodiment, and modes configured by combining components in different embodiments may also be in the scope of one or more aspects. May be included within. For example, the present invention may be realized as a method of manufacturing the wavelength control element described in the above embodiment.

DESCRIPTION OF SYMBOLS 10, 10a Lighting fixture 12 Light source 15, 15a 1st optical filter 16, 16a 2nd optical filter 20a, 20b, 20c, 20d Wavelength control element 30 Bonding member 40 Substrate 41, 42 Main surfaces

Claims (10)

Light source,
A first optical filter including a light emitting material that emits light by absorbing light in a first wavelength range;
And a second optical filter including an absorbing material that absorbs light in a second wavelength range,
One of the first optical filter and the second optical filter is located between the other of the first optical filter and the second optical filter and the light source. The luminaire according to claim 1, wherein the first optical filter is located between the second optical filter and the light source. The lighting fixture according to claim 2, wherein at least a part of the second wavelength range is included in the first wavelength range. The luminaire according to claim 1, wherein the second optical filter is located between the first optical filter and the light source. The lighting fixture according to any one of claims 1 to 4, wherein the first optical filter and the second optical filter are disposed with a gap. The lighting fixture according to any one of claims 1 to 4, wherein the first optical filter and the second optical filter are adhered by an adhesive member. The luminaire according to any one of claims 1 to 4, wherein the first optical filter and the second optical filter are in direct contact with each other. The lighting fixture according to claim 7, wherein a thickness of one of the first optical filter and the second optical filter is thinner than a thickness of the other of the first optical filter and the second optical filter. Furthermore, it comprises a light transmitting substrate,
The lighting fixture according to claim 7, wherein the first optical filter and the second optical filter are stacked on the main surface of the substrate. Furthermore, it comprises a light transmitting substrate,
The first optical filter is provided on one main surface of the substrate,
The lighting fixture according to any one of claims 1 to 4, wherein the second optical filter is provided on the other main surface of the substrate.

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