WO2010113771A1

WO2010113771A1 - Light reflector, lighting device, and lighting device for cultivating plant

Info

Publication number: WO2010113771A1
Application number: PCT/JP2010/055274
Authority: WO
Inventors: 智裕水野; 一迅人見; 賢一吉田
Original assignee: 積水化成品工業株式会社
Priority date: 2009-03-30
Filing date: 2010-03-25
Publication date: 2010-10-07
Also published as: TW201044025A; CN102365564A; CN102365564B

Abstract

Provided is a light reflector which reflects light from a light source, such as sunlight or artificial light emitted from a fluorescent lamp and which can emit reflected light having a wavelength distribution different from a wavelength distribution of the light emitted from the light source. A light reflector is characterized by the emission of reflected light having a wavelength distribution different from a wavelength distribution of the light emitted from the light source and can provide a hue which was unable to obtain from a conventional white or silver reflection plate by emphasizing the light having a wavelength distribution different from the wavelength distribution of the light emitted from the light source, can fulfill the dramatic impact effect by illumination, and can be advantageously used in applications in which, for example, the hue of the illumination light, etc., used for commodities arranged in a showcase is considered important.

Description

Light reflector, lighting device and lighting device for plant cultivation

The present invention relates to a light reflector that can emit, as reflected light, light having a wavelength distribution different from the wavelength distribution of light emitted from a light source, and an illumination device and plant cultivation illumination using the light reflector Relates to the device.

Currently, in the display field such as TV and monitor, in the lighting field such as ceiling light, downlight, security light, emergency light and insect light, in the electric signboard field such as advertising light, etc., from the light source such as fluorescent lamp and cold cathode tube In order to effectively use the light, a highly reflective light reflector is used behind the light source. This reflector is silver or white and reflects in the visible light region without changing the spectrum of light emitted from the light source.

In addition, lighting using light of some wavelengths has been proposed, such as artificial lights used for crime prevention lights and insect light. Each method has a problem that the cost is high because a special light source that emits light in a specific wavelength region is used.

For example, Patent Literature 1 proposes an outdoor lighting device that includes a plurality of white LEDs (light emitting diodes) that light white light and a plurality of blue LEDs that light blue light. Yes. This outdoor luminaire is intended to improve the crime prevention effect by utilizing the sedative effect that the blue light radiated from the blue LED acts on the human parasympathetic nerve to calm emotions. Need to be used in a large amount, and there is a problem of high cost.

Patent Document 2 proposes a color correction illumination device that includes a fluorescent lamp as a white light source and a red light emitting diode as a red light source, and is illuminated with mixed light of the fluorescent lamp and the red light emitting diode. Has been.

However, since the color correction illumination device performs color correction using a red light emitting diode with a small amount of light with respect to a fluorescent lamp, the color change of light emitted from the illumination device is slight and red. Currently, the visual effects of lighting are not as good as expected, coupled with the low human visibility.

Therefore, it is conceivable to increase the color change of the light emitted from the lighting device by increasing the number of red light-emitting diodes or increasing the output of the red light-emitting diodes. Cause problems.

On the other hand, abnormal weather such as droughts and floods occurs frequently due to changes in the global environment such as global warming. Furthermore, in order to cope with the increase in population on a global scale, sunlight is collected by lenses and light reflectors. In recent years, the development of technology for irradiating and cultivating plants and plant cultivation technology using artificial light has been rapidly demanded.

Patent Document 3 proposes a plant cultivation apparatus using a fluorescent lamp. Since the growth of plants greatly depends on the wavelength of light irradiated on the plants, in the case of fluorescent light that does not contain so much light in the wavelength range that the plant absorbs, the intensity of the fluorescent light is increased. There is a problem that power consumption is increased, and there is a problem that it becomes difficult to control the cultivation atmosphere temperature of the plant due to the heat generated by the fluorescent lamp.

Patent Documents 4 and 5 propose a plant growing apparatus using red LEDs and blue LEDs. However, since LEDs are inferior in light diffusibility, it is difficult to uniformly irradiate the plants with light. In addition to the above-described problems, the use of LEDs also has the problem of high costs.

JP 2008-305768 A JP 2008-210660 A JP 2001-352838 A Utility Model Registration No. 3105360 Japanese Patent Laid-Open No. 9-252651

The present invention relates to a light reflector capable of reflecting light from a light source such as a fluorescent lamp and irradiating light having a wavelength distribution different from the wavelength distribution of the light emitted from the light source, and the light reflector. The illumination device used and the plant cultivation illumination device are provided.

The light reflector of the present invention is characterized in that light having a wavelength distribution different from the wavelength distribution of the light emitted from the light source is emitted as reflected light.

The light reflector A is not particularly limited as long as light having a wavelength distribution different from the wavelength distribution of the light emitted from the light source is emitted as reflected light. For example, the light reflector A includes a light emitter, a light reflector, and the like. And a light reflector including a layer and a light emitter layer including a light emitter that is laminated and integrated on one surface (first surface) of the reflective layer and emits light in the visible light region.

As the light reflector, a light reflector in which a light emitter layer 2 containing a light emitter emitting light in the visible light region is laminated and integrated on one surface of the light reflective layer 1 as shown in FIG. The light reflecting layer 1 and a light emitter that is laminated and integrated on one surface (first surface) of the light reflecting layer 1 and has an emission spectrum peak in the wavelength region of 400 to 470 nm, or in the wavelength region of 570 to 700 nm. A light reflector comprising a light emitter layer containing either one or both of light emitters having an emission spectrum peak is more preferable. In FIG. 1, a plate-like light reflector is shown as an example.

Next, the light reflecting layer 1 and a light emitter that is laminated and integrated on one surface (first surface) of the light reflecting layer 1 and has an emission spectrum peak in a wavelength region of 400 to 470 nm, or a wavelength of 570 to 700 nm The light reflector provided with the light emitter layer 2 containing either or both of the light emitters having the emission spectrum peak in the wavelength region will be described in detail.

The light reflecting layer 1 is not limited as long as it can reflect light in a wavelength region emitted by the light emitter contained in the light emitter layer 2 described later, and is preferably contained in the light emitter layer 2. It is sufficient that the light in the wavelength region absorbed by the light emitter can be further reflected.

As described above, the light reflecting layer 1 reflects the light in the wavelength region emitted by the light emitter toward the light emitter layer 2, thereby increasing the amount of light having a specific wavelength emitted from the light reflector. The light reflectivity can be improved and the effect of changing the hue of the reflected light can be improved.

Furthermore, when the light reflection layer 1 can further reflect light in the wavelength region absorbed by the light emitter contained in the light emitter layer 2, the light reflector 2 transmits through the light emitter layer 2 and is absorbed by the light emitter. The light that has not been reflected can be reflected in the direction of the illuminant layer 2 by the light reflecting layer 1 and incident again on the illuminant layer 2 to be absorbed by the illuminant. The effect of changing the light reflectivity of the body and the hue of the reflected light can be further improved.

The total light reflectance of the light reflection layer 1 is preferably 80% or more, and more preferably 85% or more. The total light reflectance of the light reflecting layer 1 refers to a value measured according to JIS Z8722.

If the average light transmittance in the wavelength region of 360 to 740 nm in the light reflecting layer 1 is high, the light emitted from the light emitting layer is transmitted through the light reflecting layer, and the light reflectivity of the light reflecting member is reduced. It is preferably 10% or less, more preferably 1% or less, and particularly preferably 0%. The average light transmittance in the wavelength region of 360 to 740 nm in the light reflecting layer is a value measured according to JIS Z8722.

Such a light reflecting layer 1 is preferably a synthetic resin sheet, and more preferably a thermoplastic resin sheet. As the light reflecting layer 1, for example, a light reflecting non-foamed sheet or foamed sheet containing particles such as titanium oxide or silica, or a sheet made of a mixed resin obtained by mixing mutually incompatible synthetic resins is stretched. Non-foamed sheet formed with a large number of voids, non-foamed sheet formed by stretching a sheet containing a filler to form a large number of voids, a light-reflective foamed sheet containing a large amount of fine bubbles, etc. And those that can be thermoformed are preferred. In addition, the light reflection layer 1 may be a layer obtained by appropriately selecting the above non-foamed sheet or foamed sheet and stacking and integrating them.

As shown in FIG. 2, the light reflecting layer 1 is configured such that the non-foamed sheet 1a and the foamed sheet 1b are laminated and integrated, and the non-foamed sheet 1a is on the light emitter layer 2 side. The strength, self-shaping property or moldability can be imparted to the light reflecting layer.

Further, when the light reflecting layer 1 is configured such that the non-foamed sheet 1a and the foamed sheet 1b are laminated and integrated, and the non-foamed sheet 1a is on the light emitter layer side, In order to improve the light reflectance, the foamed sheet 1b preferably contains titanium oxide.

If the content of titanium oxide in the foam sheet 1b is small, the effect of improving the light reflectivity may not be manifested, and if it is large, the lightness of the light reflector may be reduced. The amount is preferably 5 to 50 parts by weight, more preferably 10 to 40 parts by weight based on 100 parts by weight of the synthetic resin.

The synthetic resin constituting the light reflecting layer 1 is not particularly limited, and examples thereof include polyolefin resins such as low density polyethylene, high density polyethylene, ethylene-α-olefin copolymer, polypropylene, and cyclic polyolefin, polyethylene terephthalate. Polyester resins such as polyethylene naphthalate, polybutylene terephthalate and polylactic acid, polyamide resins such as nylon-6 and nylon-6,6, polystyrene resins such as polystyrene, ABS resin and AS resin, polycarbonate, polyester carbonate, etc. And thermoplastic resins such as chlorinated resins such as polycarbonate resins, polyvinyl chloride and polyvinylidene chloride, and acrylic resins such as polymethyl methacrylate and polyethyl methacrylate. In addition, a synthetic resin may be used independently or 2 or more types may be used together. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene, 1-nonene and 1-decene.

Examples of the particles contained in the light-reflective non-foamed sheet or foamed sheet include zinc oxide, zinc white, talc, calcium carbonate, titanium oxide, silica, and the like, and the difference in refractive index from the synthetic resin is large. Titanium oxide having high reflectivity is preferable.

Titanium oxide includes rutile type, anatase type, and brucite type, but rutile type titanium oxide is preferable. Since titanium oxide usually degrades the resin by its photocatalytic action, it is preferable to subject the titanium oxide to a surface treatment.

When the content of titanium oxide in the synthetic resin sheet is small, the light reflection performance of the light reflector is lowered. On the other hand, when the content is large, the lightness of the light reflector is also lowered. Therefore, 30 to 200 g / m ² is preferable. 40 to 150 g / m ² is more preferable. When a plurality of synthetic resin sheets containing titanium oxide are present in the light reflecting layer 1, the content of titanium oxide in the synthetic resin sheet is included in the plurality of synthetic resin sheets. The total content of titanium oxide.

Further, a foam layer may be laminated and integrated on the other surface (second surface) of the light reflecting layer of the light reflector in order to give the light reflector strength, self-shape retention or moldability. . Since the synthetic resin constituting the foam layer is the same as the synthetic resin constituting the light reflecting layer, description thereof is omitted.

Next, the light emitting layer 2 laminated and integrated on the light reflecting layer 1 will be described. The phosphor layer 2 contains a phosphor that emits light in the visible light region (360 to 740 nm wavelength region) in a synthetic resin.

The luminous body layer 2 is either one or both of a luminous body having an emission spectrum peak in the wavelength region of 400 to 470 nm and a luminous body having an emission spectrum peak in the wavelength region of 570 to 700 nm in the synthetic resin. It is preferable to contain.

The light emitter layer 2 contains either or both of a light emitter having an emission spectrum peak in the wavelength region of 400 to 470 nm and a light emitter having an emission spectrum peak in the wavelength region of 570 to 700 nm. The case will be described in detail.

In the light reflector A, the light emitter absorbs a part of the incident light incident on the light emitter layer 2, and each light emitter has a light emission region, that is, a wavelength region of 400 to 470 nm or a wavelength region of 570 to 700 nm. Emits light in the wavelength region.

That is, the light emitter included in the light emitter layer 2 emits light in the wavelength region of 400 to 470 nm (blue light) or light in the wavelength region of 570 to 700 nm (red light). As for the reflected light reflected by the reflector, either one or both of blue light and red light is emphasized as compared with incident light.

Therefore, by emphasizing one or both of blue or red light, it becomes easier for human eyes to recognize blue or red light, and for applications that emphasize hue such as display devices and lighting. It can be used suitably.

The light emitter layer 2 contains only one of a light emitter having an emission spectrum peak in the wavelength region of 400 to 470 nm and a light emitter having an emission spectrum peak in the wavelength region of 570 to 700 nm. However, it may contain both a light emitter having an emission spectrum peak in the wavelength region of 400 to 470 nm and a light emitter having an emission spectrum peak in the wavelength region of 570 to 700 nm. Whether the luminescent material having the emission spectrum peak in the wavelength region of 470 nm, the luminescent material having the emission spectrum peak in the wavelength region of 570 to 700 nm, or both of them is incident on the luminescent material layer 2 What is necessary is just to adjust suitably according to the spectrum of the incident light to perform.

Further, when the light emitter layer 2 contains a light emitter having an emission spectrum peak in the wavelength region of 400 to 470 nm or a light emitter having an emission spectrum peak in the wavelength region of 570 to 700 nm, in the reflection spectrum of the body, the maximum light reflectance in the wavelength region of 400 ~ 470 nm, the difference between the minimum light reflectance in the wavelength region of 470 ~ 570 nm and delta _1, and the maximum light reflectance in the wavelength region of 570 ~ 700 nm it is preferable when the difference between the minimum light reflectance in the wavelength region of 470 ~ 570 nm and delta _2, delta ₁ or delta ₂ is not less than 1%.

In this way, by adjusting Δ ₁ or Δ ₂ to be 1% or more, in the reflected light of the light reflector, blue light or red light having inferior visibility compared to green light can be obtained. It becomes easier for human eyes to recognize.

Further, when the light emitter layer 2 contains a light emitter having an emission spectrum peak in the wavelength region of 400 to 470 nm or a light emitter having an emission spectrum peak in the wavelength region of 570 to 700 nm, In the reflection spectrum of the body, it is preferable that the maximum light reflectance in the wavelength region of 400 to 470 nm or the maximum light reflectance in the wavelength region of 570 to 700 nm exceeds 100%. By adjusting in this way, the reflected light of the light reflector can be emphasized more reliably by increasing the amount of blue light or red light than incident light, compared to green light. This makes it easier for human eyes to recognize blue or red light with poor visibility.

Further, when the light emitter layer 2 contains a light emitter having an emission spectrum peak in the wavelength region of 400 to 470 nm and a light emitter having an emission spectrum peak in the wavelength region of 570 to 700 nm, in the reflection spectrum of the body, the maximum light reflectance in the wavelength region of 400 ~ 470 nm, the difference between the minimum light reflectance in the wavelength region of 470 ~ 570 nm and delta _1, and the maximum light reflectance in the wavelength region of 570 ~ 700 nm When the difference from the minimum light reflectance in the wavelength region of 470 to 570 nm is Δ ₂ , Δ ₁ and Δ ₂ are preferably 1% or more.

In this way, by adjusting Δ ₁ and Δ ₂ to be 1% or more, blue light and red light can be more reliably emphasized in the reflected light of the light reflector. This makes it easier for human eyes to recognize blue and red light, which has inferior visual sensitivity compared to the light of the system.

Further, when the light emitter layer 2 contains a light emitter having an emission spectrum peak in the wavelength region of 400 to 470 nm and a light emitter having an emission spectrum peak in the wavelength region of 570 to 700 nm, In the reflection spectrum of the body, it is preferable that the maximum light reflectance in the wavelength region of 400 to 470 nm and the maximum light reflectance in the wavelength region of 570 to 700 nm exceed 100%. By adjusting in this way, the reflected light of the light reflector can be more reliably emphasized by increasing the amount of blue light and red light than incident light, compared to green light. This makes it easier for human eyes to recognize blue and red light with poor visibility.

Further, in the reflection spectrum of the light reflector, the maximum light reflectance in the wavelength region of 360 to 740 nm is preferably 100% or more. By adjusting in this way, the light in the specific wavelength range emitted from the light emitter can be more reliably emphasized than the incident light in the reflected light of the light reflector.

Note that the synthetic resin constituting the light emitter layer 2 is the same as the synthetic resin constituting the light reflecting layer 1, and therefore the description thereof is omitted. The synthetic resin constituting the light emitter layer 2 and the synthetic resin constituting the light reflecting layer 1 may be different.

As the illuminant contained in the illuminant layer 2, a pigment or a dye that generates fluorescence or phosphorescence is used. Fluorescence refers to light that is emitted when transitioning from an excited singlet state to a ground state. Industrially, phosphors using this phenomenon are widely used as fluorescent pigments and fluorescent dyes.

Phosphorescence refers to light emitted when transitioning from the excited triplet state to the ground state. Industrially, phosphors utilizing this phenomenon are widely used as phosphorescent pigments and phosphorescent dyes. Yes.

An illuminant having an emission spectrum peak in the wavelength region of 400 to 470 nm, or an illuminant having an emission spectrum peak in the wavelength region of 570 to 700 nm includes an organic illuminant having an organic dye structure, an inorganic type There are inorganic light emitters having the following dye structure.

Examples of organic phosphors include xanthene, coumarin, perylene, naphthalimide, acridine, thioflavine, diaminostilbene, imidazole, thiazole, oxazole, pyrazoline, anthraquinone, and methine. And phosphors having an organic dye structure such as benzopyran, thioindigo, azo, or phthalocyanine. The organic light emitters may be used alone or in combination of two or more.

Examples of the inorganic phosphor include inorganic pigment structures such as sulfides such as ZnS and (ZnCd) S, and oxides such as Zn ₂ SiO ₄ , Cd ₂ B ₂ O ₅ , YVO ₃ and CaWO _4. The light-emitting body which has is mentioned. An inorganic type light-emitting body may be used independently, or 2 or more types may be used together.

In addition, as a luminescent material having an emission spectrum peak in the wavelength region of 400 to 470 nm, that is, a pigment or dye that absorbs light in the ultraviolet region and emits fluorescence or phosphorescence in the wavelength region of 400 to 470 nm, it is a product from Clariant. The name “Hostalux KCB”, the product name “OB-1” from Eastman Corporation, the product name “TBO” from Sumitomo Seika Co., Ltd., the product name “Kecoal” from Nippon Kayaku, and the product name “Kayalite from Nippon Kayaku Co., Ltd.” ”, Product names“ Lumogen F Blue 650 ”and“ Lumogen F Violet 570 ”from BASF, product names“ FZ-2808 ”,“ FZ-SB ”and“ FZ-5009 ”from Sinloi, and product names from DeGlo It is commercially available under "ZQ-19" and "IPO-19".

Further, as a light emitter having an emission spectrum peak in the light wavelength region of 570 to 700 nm, that is, a pigment or dye that absorbs light in the ultraviolet region or visible light region and emits fluorescence or phosphorescence in the wavelength region of 570 to 700 nm. Are, for example, trade names “Kayakril Rhodamine FB” from Nippon Kayaku, trade names “Lumogen F Red 305” from BASF, and trade names “FZ-2803”, “FZ-2801”, “FZ- 2817 ”,“ FX-301 ”,“ FX-303 ”,“ FX-307 ”and“ FX-327 ”, trade names“ NX-13 ”,“ GPL-13 ”,“ Z-13 ” “IPO-13” is commercially available from Inagawa River Co., Ltd. under the trade name “Rhodamine B Lake”.

If the total amount of the light emitters in the light emitter layer 2 is small, the amount of light emitted from the light emitter layer is small. Therefore, the amount is preferably 0.01 parts by weight or more with respect to 100 parts by weight of the synthetic resin. 2 does not change, and the concentration may be quenched depending on the concentration and dispersion of the illuminant. Therefore, it is preferably 65 parts by weight or less, more preferably 30 parts by weight or less, based on 100 parts by weight of the synthetic resin. Part by weight or less is particularly preferred.

The light emitter layer 2 may contain a light reflective filler. The light-reflective filler is not limited as long as it can reflect light, but the wavelength region of the reflected light reflected at the interface between the synthetic resin and the light-reflective filler constituting the light emitter layer, and the light emitter It is preferable to select the light reflective filler so that the light absorption wavelength region or the light emission wavelength region in the luminescent material contained in the layer overlaps.

Thus, by making the light emitter layer 2 contain the light reflective filler, the light incident on the light emitter layer 2 is converted into the interface between the synthetic resin constituting the light emitter layer 2 and the light reflective filler. , And the light emitter can absorb a larger amount of light and emit light in the visible light region.

In particular, the wavelength range of the reflected light reflected at the interface between the synthetic resin constituting the phosphor layer and the light reflective filler overlaps with the light absorption wavelength region of the phosphor contained in the phosphor layer. By selecting the light-reflective filler as described above, the light-emitting body in the light-emitting body layer can efficiently absorb light and emit a lot of light of a specific wavelength, thereby enhancing the light-emitting action of the light-emitting body. The hue of the reflected light by the light reflector can be changed more reliably.

Also, the wavelength range of the reflected light reflected at the interface between the synthetic resin constituting the light emitter layer and the light reflective filler overlaps with the light emission wavelength region of the light emitter contained in the light emitter layer. By selecting the light reflective filler as described above, the light emitted from the light emitter can be reflected by the light reflective filler to be efficiently emitted outside the light emitter layer. The hue can be changed more reliably.

Such a light-reflective filler is not particularly limited as long as it has light reflectivity, and examples thereof include synthetic resin particles and pigments having light reflectivity, and pigments are preferable, White pigments are more preferred.

The synthetic resin constituting the synthetic resin particles is not particularly limited as long as it is a synthetic resin having a refractive index different from the refractive index of the synthetic resin constituting the luminescent layer 2. For example, low density polyethylene Polyolefin resins such as high-density polyethylene, polypropylene and cyclic polyolefin, polyester resins such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate and polylactic acid, polyamide resins such as nylon-6 and nylon-6,6, polystyrene Polystyrene resins such as ABS resin and AS resin, polycarbonate resins such as polycarbonate and polyester carbonate, chlorine resins such as polyvinyl chloride and polyvinylidene chloride, polymethyl methacrylate, polyethyl methacrylate, etc. Thermoplastic resins such as acrylic resins. In addition, a synthetic resin may be used independently or 2 or more types may be used together.

The pigment is not particularly limited as long as it has a refractive index different from the refractive index of the synthetic resin constituting the luminescent layer 2, and examples thereof include white pigments such as zinc white, lead white, and titanium oxide. Inorganic pigments such as red lead, yellow lead, zinc yellow, ultramarine blue, prussian blue, xanthene, coumarin, perylene, naphthalimide, acridine, thioflavine, diaminostilbene, imidazole, thiazole, oxazole Organic pigments having a dye structure such as azo-type, pyrazoline-type, anthraquinone-type, methine-type, benzopyran-type, thioindigo-type, azo-type, phthalocyanine-type, etc. White pigments such as zinc white, lead white and titanium oxide having performance are preferable.

The white pigment is not particularly limited. For example, magnesium sulfate, magnesium carbonate, alumina, lead oxide, barium carbonate, barium sulfate, potassium titanate, zinc oxide, zinc white, lead white, talc, calcium carbonate, titanium oxide. Titanium oxide is preferable because it has a high refractive index and a large difference from the refractive index of the synthetic resin constituting the phosphor layer.

Further, if the difference between the refractive index of the light reflective filler and the refractive index of the synthetic resin constituting the light emitter layer 2 is small, the synthetic resin constituting the light reflective filler and the light emitter layer. Since the light reflectivity at the interface may decrease, it is preferably 0.05 or more, more preferably 0.10 or more.

If the content of the light reflective filler in the light emitter layer 2 is small, the light reflectivity in the light absorption wavelength region or the light emission wavelength region of the light emitter layer is lowered, and the amount of emitted light from the light emitter is reduced. The light reflectivity of the light reflector may decrease, and if it is large, the amount of light incident on the light emitter layer is reduced, or the light emitted from the light emitter is less likely to be emitted outside the light emitter layer. Therefore, 0.05 to 50 parts by weight is preferable, 0.05 to 25 parts by weight is more preferable, and 0.1 to 10 parts by weight with respect to 100 parts by weight of the synthetic resin constituting the light emitting layer. Is particularly preferred.

Further, as shown in FIGS. 3 and 4, a light reflective surface layer 3 may be laminated and integrated on one surface of the light emitting layer 2. The surface layer 3 contains a synthetic resin and a light reflective filler. Specifically, the light reflective filler is contained in the synthetic resin.

The surface layer 3 limits the amount of light incident on the light emitting layer 2 by including a light reflective filler in the synthetic resin. It has been found that the illuminant contained in the illuminant layer 2 is deactivated when the total amount (cumulative amount) of the light absorbed by the illuminant reaches a certain amount and does not perform the light emitting action. by.

Therefore, if the average light transmittance in the wavelength region of 360 to 740 nm in the surface layer 3 is high, the amount of light incident on the light emitter layer increases, and the amount of light per unit time absorbed by the light emitter in the light emitter layer is reduced. As a result, the period in which the luminescent material exhibits a light emitting action is shortened, so 70% or less is preferable, 0.05 to 50% is more preferable, and 0.05 to 30% is particularly preferable. The average light transmittance in the wavelength region of 360 to 740 nm in the surface layer 3 is a value measured according to JIS Z8722.

Further, the surface layer 3 absorbs light limited by the surface layer 3 as much as possible by the light emitter in the light emitter layer 2 or emits light emitted from the light emitter as much as possible outside the light reflector from the surface layer 3. The synthetic resin constituting the surface layer 3 and the light contained in the surface layer 3 in order to improve the light reflectivity of the light reflector and to improve the change in the hue of reflected light by the light reflector It is preferable that the wavelength region of the reflected light reflected at the interface with the reflective filler overlaps with the light absorption wavelength region or the emission wavelength region in the light emitter contained in the light emitter layer 2.

The wavelength region of the reflected light reflected at the interface between the synthetic resin constituting the surface layer 3 and the light-reflective filler overlaps with the light absorption wavelength region in the light emitter contained in the light emitter layer 2. By selecting the light reflective filler as described above, the light incident on the light emitter layer 2 is transmitted through the light emitter layer 2 without being absorbed by the light emitter, and reflected by the light reflector layer 1 toward the light emitter layer 2 side. However, the light which has been transmitted but is not absorbed by the light emitter but has passed through the light emitter layer 2 is again reflected by the surface layer 3 toward the light emitter layer 2 and is incident on the light emitter layer 2. The light emitter in the light emitter layer 2 can absorb light efficiently and emit a large amount of light of a specific wavelength to enhance the light emitting action of the light emitter, thereby improving the light reflectivity and light reflection of the light reflector. The hue of light reflected by the body can be changed more reliably.

In addition, the wavelength range of the reflected light reflected at the interface between the synthetic resin constituting the light emitter layer and the light reflective filler overlaps the light emission wavelength region of the light emitter contained in the light emitter layer. By selecting the light-reflective filler as described above, the light in the wavelength region emitted from the light emitter among the light incident on the light reflector is reflected outside the light reflector by the surface layer and emitted from the light emitter. Light can be uniformly emitted outside the light reflector while being irregularly reflected by the light-reflective filler, and the light reflectivity of the light reflector is improved and the hue of light reflected by the light reflector is changed more reliably and uniformly. be able to.

The synthetic resin constituting the surface layer 3 is not particularly limited. For example, polyolefin resins such as low density polyethylene, high density polyethylene, polypropylene, ethylene-α-olefin copolymer, cyclic polyolefin, polyethylene terephthalate, Polyester resins such as polyethylene naphthalate, polybutylene terephthalate, polylactic acid, polyamide resins such as nylon-6, nylon-6,6, polystyrene resins such as polystyrene, ABS resin, AS resin, polycarbonate, polyester carbonate, etc. Examples thereof include thermoplastic resins such as polycarbonate resins, chlorinated resins such as polyvinyl chloride and polyvinylidene chloride, and acrylic resins such as polymethyl methacrylate and polyethyl methacrylate. In addition, a synthetic resin may be used independently or 2 or more types may be used together. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene, 1-nonene and 1-decene.

The light reflective filler is not particularly limited as long as it has light reflectivity, and examples thereof include synthetic resin particles and pigments having light reflectivity. Pigments are preferred, white pigments Is more preferable.

The synthetic resin constituting the synthetic resin particles is not particularly limited as long as it is a synthetic resin having a refractive index different from the refractive index of the synthetic resin constituting the surface layer 3, for example, low density polyethylene, Polyolefin resins such as high-density polyethylene, polypropylene, and cyclic polyolefin, polyester resins such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polylactic acid, polyamide resins such as nylon-6, nylon-6,6, polystyrene, Examples thereof include thermoplastic resins such as polystyrene resins such as ABS resin and AS resin, chlorine resins such as polyvinyl chloride and polyvinylidene chloride, and acrylic resins such as polymethyl methacrylate and polyethyl methacrylate. In addition, a synthetic resin may be used independently or 2 or more types may be used together.

The pigment is not particularly limited as long as it has a refractive index different from that of the synthetic resin constituting the surface layer 3, and examples thereof include white pigments such as zinc white, lead white, and titanium oxide, lead Inorganic pigments such as red, yellow lead, zinc yellow, ultramarine blue, prussian blue, xanthene, coumarin, perylene, naphthalimide, acridine, thioflavine, diaminostilbene, imidazole, thiazole, oxazole Organic pigments having a pyrazoline-based, anthraquinone-based, methine-based, benzopyran-based, thioindigo-based, azo-based, or phthalocyanine-based hue structure, and the like, and white pigments are preferred.

The white pigment is not particularly limited. For example, magnesium sulfate, magnesium carbonate, alumina, lead oxide, barium carbonate, barium sulfate, potassium titanate, zinc oxide, zinc white, lead white, talc, calcium carbonate, titanium oxide. Titanium oxide is preferable because it has a high refractive index and a large difference from the refractive index of the synthetic resin constituting the surface layer 3.

If the difference between the refractive index of the light reflective filler and the refractive index of the synthetic resin constituting the surface layer is small, the interface between the light reflective filler and the synthetic resin constituting the surface layer is small. Since the light reflectivity in may be lowered, 0.05 or more is preferable, and 0.10 or more is more preferable.

If the content of the light-reflective filler in the surface layer is small, the amount of light transmitted through the surface layer increases, and the amount of light absorbed by the light emitter in the light emitter layer increases per unit time. The duration of the effect of changing the hue of the reflected light by the light reflector is shortened and the duration of the effect of changing the hue of the reflected light by the light reflector is shortened. Is less likely to be released out of the light reflector through the surface layer, so 0.05 to 50 parts by weight is preferable with respect to 100 parts by weight of the synthetic resin constituting the surface layer 3, and 0.05 to 25 parts by weight. Part is more preferable, and 0.1 to 20 parts by weight is particularly preferable.

The light reflecting layer 1, the light emitting layer 2 and the surface layer 3 are provided with a stabilizer such as a light stabilizer, an ultraviolet absorber, an antioxidant, a metal deactivator, and an antistatic agent within the range not impairing these physical properties. An additive such as a flame retardant may be added.

Examples of the light stabilizer include bis (2,2,6,6-tetramethyl-4-piperidinyl) sebacate, bis (N-methyl-2,2,6,6-tetramethyl-4-piperidinyl) sebacate, Bis (1,2,2,6,6-pentamethyl-4-piperidinyl) -2- (3,5-di-t-butyl-4-hydroxybenzyl) -2-n-butylmalonate, tetrakis (2, 2,6,6-tetramethyl-4-piperidyl) -1,2,3,4-butane-tetracarboxylate, tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) -1,2 , 3,4-Butane-tetracarboxylate, (2,2,6,6-tetramethyl-4-piperidyl) -1,2,3,4-butane-tetracarboxylate and (2,2,6,6 -Tetramethyl-4 Tridecyl) -1,2,3,4-butane-tetracarboxylate, (1,2,2,6,6-pentamethyl-4-piperidyl) -1,2,3,4-butane-tetracarboxylate And a mixture of (1,2,2,6,6-pentamethyl-4-tridecyl) -1,2,3,4-butane-tetracarboxylate, {2,2,6,6-tetramethyl-4 -Piperidyl-3,9- [2,4,8,10-tetraoxaspiro (5,5) undecane] diethyl} -1,2,3,4-butane-tetracarboxylate and {2,2,6 6-tetramethyl-β, β, β ′, β′-tetramethyl-3,9- [2,4,8,10-tetraoxaspiro (5,5) undecane] diethyl} -1,2,3 A mixture with 4, -butane-tetracarboxylate, {1,2,2,6,6-Pentamethyl-4-piperidyl-3,9- [2,4,8,10-tetraoxaspiro (5,5) undecane] diethyl} 1,2,3,4 Butane-tetracarboxylate and {1,2,2,6,6-pentamethyl-β, β, β ′, β′-tetramethyl-3-3,9- [2,4,8,10-tetraoxaspiro ( 5,5) Undecane] diethyl} 1,2,3,4-butane-tetracarboxylate mixture, poly [6- (1,1,3,3-tetramethylbutyl) imino-1,3,5- Triazine-2,4-diyl], [(2,2,6,6-tetramethyl-4-piperidyl) imino] hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino], 4-hydroxy-2,2,6,6-tetramethyl-1-pi Mixture of lysine ethanol and dimethyl succinate polymer, N, N ′, N ″, N ′ ″-tetrakis {4,6-bis [butyl- (N-methyl-2,2,6,6-tetra Methylpiperidyl-4-yl) amino] -triazin-2-yl} -4,7-diazadecane-1,10-diamine, and the like may be used alone or in combination of two or more.

If the content of the light stabilizer in the light reflecting layer 1, the light emitter layer 2 or the surface layer 3 is small, the resin deterioration of the light reflector cannot be suppressed. Synthetic resin constituting the light reflecting layer 1, the light emitting layer 2, or the surface layer 3 because there is no change in the suppression effect and adverse effects such as reducing the light reflectivity of the light reflector by coloring the light stabilizer itself. 0.01 to 0.8 part by weight is preferable with respect to 100 parts by weight, and 0.05 to 0.5 part by weight is more preferable.

Examples of the ultraviolet absorber include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- [2′-hydroxy-3 ′, 5′-bis (α, α-dimethylbenzyl) phenyl]. -Benzotriazole, 2- (2'-hydroxy-3 ', 5-di-t-butylphenyl) -benzotriazole, 2- (2'-hydroxy-3'-t-butyl-5'-methylphenyl)- 5-chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-t-butylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′-di- t-amyl) benzotriazole, 2- (2′-hydroxy-5′-t-octylphenyl) benzotriazole, 2,2-methylenebis [4- (1,1,3,3-tetramethylbutane) Til) -6- (2N-benzotriazol-2-yl) phenol], 2,4-dihydroxy-benzophenone, 2-hydroxy-4-methoxy-benzophenone, 2-hydroxy-4- Methoxybenzophenone-5-sulfonic acid, 2-hydroxy-4-n-octyl-benzophenone, 2-hydroxy-4-n-dodecyloxy-benzophenone, bis (5-benzoyl-4-hydroxy-2-methoxyphenyl) methane, 2 Benzophenone UV absorbers such as 2,2'-dihydroxy-4-methoxy-benzophenone and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, salicylates such as phenyl salicylate and 4-t-butylphenyl salicylate UV absorber, ethyl-2- Cyanoacrylate-based UV absorbers such as ano-3,3-diphenyl-acrylate and 2-ethylhexyl-2-cyano-3,3′-diphenyl-acrylate, 2-ethoxy-3-t-butyl-2′-ethyl- Oxanilic acid anilide ultraviolet absorbers such as oxalic acid bisanilide and 2-ethoxy-2′-ethyl-oxalic acid bisanilide, 2,4-di-t-butylphenyl-3,5-di-t-butyl-4 -Benzoate UV absorbers such as hydroxybenzoate, 2- [4,6-bis (2,4-dimethylphenyl) -1,3,5-triazin-2-yl] -5-hydroxyphenol, 2- (2 , 4-Dihydroxyphenyl) -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2,4-bis (2-hydride) Examples include triazine-based UV absorbers such as xyl-4-butoxyphenyl) -6- (2,4-dibutoxyphenyl) -1,3,5-triazine. May be.

If the content of the ultraviolet absorber in the light reflecting layer 1, the light emitter layer 2 or the surface layer 3 is small, the light reflecting property of the light reflector cannot be suppressed from being lowered. Since there is no change in the effect of suppressing the decrease in light reflectivity, 0.01 to 0.8 parts by weight with respect to 100 parts by weight of the synthetic resin constituting the light reflection layer 1, the light emitter layer 2 or the surface layer 3 Preferably, 0.05 to 0.5 part by weight is more preferable.

Further, in the case of the light reflector A having the surface layer 3, the maximum light reflectance in the wavelength region of 360 to 740 nm is preferably 100% or more in the reflection spectrum of the light reflector. By adjusting in this way, the light in the specific wavelength range emitted from the light emitter can be more reliably emphasized than the incident light in the reflected light of the light reflector.

In the case of the light reflector A having the surface layer 3, the maximum light reflectance in the wavelength region of 360 to 740 nm in the reflection spectrum of the light reflector is set at a set temperature of 50 ° C. and a set relative relative to JIS K7350-4. It is preferably 100% or more after 100 hours of accelerated exposure test conducted under the condition of 20% humidity. By adjusting in this way, the light in the specific wavelength region emitted by the light emitter in the reflected light of the light reflector can be emphasized over the incident light over a long period of time.

The set temperature of 50 ° C. means that the temperature set in the accelerated exposure apparatus used for the accelerated exposure test is 50 ° C. That is, the accelerated exposure apparatus used in the accelerated exposure test stops heating by the heating member when the measured ambient temperature exceeds the set temperature, while heating by the heated member stops when the measured ambient temperature falls below the set temperature. It is configured to start, and the measured ambient temperature in the accelerated exposure apparatus may rise and fall around a set temperature. However, the measurement ambient temperature in the accelerated exposure apparatus must be such that the minimum temperature is 45 ° C. and the maximum temperature is 55 ° C.

The set relative humidity of 20% means that the relative humidity set in the accelerated exposure apparatus used for the accelerated exposure test is 20%. That is, the accelerated exposure apparatus used for the accelerated exposure test stops the humidification by the humidifying member when the relative humidity of the measurement atmosphere exceeds the set relative humidity, while the relative humidity of the measurement atmosphere is lower than the set relative humidity. Further, the relative humidity of the measurement atmosphere in the accelerated exposure apparatus may be raised or lowered around the set relative humidity. However, the relative humidity in the measurement atmosphere in the accelerated exposure apparatus must be such that the minimum relative humidity is 10% and the maximum relative humidity is 30%.

In addition, as an accelerated exposure apparatus used for the accelerated exposure test, an apparatus commercially available from Suga Test Instruments Co., Ltd. under the trade name “Sunshine Super Long Life Weather Meter WEL-SUN-HC / B type” can be used.

Next, a method for manufacturing the light reflector of the present invention will be described. The method for producing the light reflector is not particularly limited. For example, (1) a thermoplastic resin composition for a phosphor layer containing a thermoplastic resin and a phosphor is supplied to the first extruder and melt kneaded. On the other hand, a thermoplastic resin composition for a light reflecting layer containing a thermoplastic resin and the above particles is supplied to a second extruder, melt-kneaded, and the same die connecting the first and second extruders By supplying the thermoplastic resin composition for the light-emitting layer and the thermoplastic resin composition for the light-reflecting layer to the coextrusion, the light-emitting body is formed on one surface of the light-reflecting layer comprising the thermoplastic resin composition for the light-reflecting layer. A method for producing a light reflector obtained by laminating and integrating a light emitter layer composed of a thermoplastic resin composition for a layer; (2) a paint containing a light emitter is applied and dried on a light reflective layer prepared in advance; Examples include a method of manufacturing a light reflector by laminating and integrating light emitter layers. That.

Also, a method for producing a light reflector having a surface layer will be described. The method for producing the light reflector is not particularly limited. For example, (1) a method for producing the light reflecting layer, the light emitting layer and the surface layer by coextrusion, and (2) a light reflecting property constituting the light reflecting layer. A thermoplastic resin film constituting the light emitter layer is laminated and integrated on the light reflector having the same, and a light reflecting material having light reflectivity constituting the surface layer is laminated and integrated on the thermoplastic resin film. (3) On the light reflector having light reflectivity constituting the light reflection layer, a paint containing a light emitter constituting the light emitter layer is applied and dried, and further on the light emitter layer, It can be manufactured by a manufacturing method in which light reflectors having light reflectivity constituting a surface layer are laminated and integrated, and the thickness of each layer can be easily controlled and the productivity is high. It is preferable to manufacture by. For example, a thermoplastic resin composition for a light reflecting layer containing a thermoplastic resin and the above-mentioned particles is supplied to a first extruder and melt-kneaded, and a thermoplastic resin composition for a phosphor layer containing a thermoplastic resin and a phosphor. The product is supplied to the second extruder and melt-kneaded, and the thermoplastic resin composition for the surface layer containing the thermoplastic resin and the light-reflective filler is supplied to the third extruder and melt-kneaded. By supplying and coextruding the thermoplastic resin composition for the light reflecting layer, the thermoplastic resin composition for the light emitter layer, and the thermoplastic resin composition for the surface layer to the same die to which the three extruders are connected, A light emitting layer made of a thermoplastic resin composition for a light emitter layer is laminated and integrated on one surface of a light reflecting layer made of a thermoplastic resin composition for a light reflecting layer, and heat for the surface layer is formed on one surface of this light emitter layer. The surface layer made of the plastic resin composition is laminated and integrated. And a method of manufacturing a light reflector and the like.

Also, a method for producing a light reflector in which the light reflecting layer is formed by laminating and integrating a non-foamed sheet and a foamed sheet will be described. As a manufacturing method of this light reflector, a general-purpose method is used, for example, a thermoplastic resin composition for a light reflection layer containing a thermoplastic resin and the above particles is supplied to a first extruder and melt-kneaded, A thermoplastic resin composition for a phosphor layer containing a thermoplastic resin and a phosphor is supplied to a second extruder and melt-kneaded, and the thermoplastic resin and additives such as rutile type titanium oxide contained as necessary A thermoplastic resin composition containing the above is supplied to a third extruder and melt-kneaded, and a foaming agent is injected into the third extruder and melt-kneaded to obtain a foamable thermoplastic resin composition. Extruded into a joining die to form a laminate in which the thermoplastic resin composition for the light emitter layer, the thermoplastic resin composition for the light reflecting layer, and the foamable thermoplastic resin composition are laminated in this order, and this laminate is joined Extrusion from a die attached to the tip of the die A non-foamed sheet made of a thermoplastic resin composition for a light reflecting layer is laminated on one side of a foamed sheet obtained by foaming a foamable thermoplastic resin composition, A light reflector formed by laminating and integrating light emitting layers made of the thermoplastic resin composition for layers can be produced.

When the non-foamed sheet of the light reflecting layer is formed from the foamed sheet, a foaming agent may be press-fitted into the first extruder to make the thermoplastic resin composition for the light reflecting layer foamable. When the reflective layer is composed of a single foam sheet, the third extruder need not be connected to the joining die. In addition, when forming a surface layer on the light emitting layer, a fourth extruder is connected to a converging die, and the fourth extruder includes a thermoplastic resin and a light-reflective filler. The resin composition may be supplied to coextrude the surface layer thermoplastic resin composition, and the surface layer thermoplastic resin composition may be laminated and integrated as a surface layer on the phosphor layer. The die is not particularly limited as long as it is widely used in extrusion foaming, and examples thereof include a T die and an annular die.

In the above production method, when a T die is used as the die, the light reflector having the above-described configuration can be produced by extrusion foaming into a sheet form from an extruder.

When an annular die is used as the die, a cylindrical body is produced by extrusion foaming from the annular die into a cylindrical shape, and the cylindrical body is gradually expanded in diameter and then supplied to a cooling mandrel for cooling. After that, the light reflector having the above-described configuration can be manufactured by cutting the cylindrical body continuously between the inner and outer peripheral surfaces in the direction of extrusion, and opening and developing the cylindrical body.

The blowing agent is not particularly limited, and is an organic gas such as saturated aliphatic hydrocarbons such as propane, butane and pentane, and halogenated hydrocarbons such as tetrafluoroethane, chlorodifluoroethane and difluoroethane; carbon dioxide and nitrogen gas. Gaseous inorganic compounds such as water; liquid inorganic compounds such as water; mixtures of organic acids or salts thereof with bicarbonate, such as a mixture of sodium bicarbonate and citric acid, dinitrosopentamethylenetetramine, etc. Solid foaming agents and the like are mentioned, and it is preferable to use a mixture of an organic acid or a salt thereof and bicarbonate and an organic gas, and a mixture of sodium bicarbonate and citric acid and an organic gas are used. It is more preferable to use together.

The light reflector thus obtained contains a light emitter that emits light in the visible light region in the light emitter layer 2 and emits ultraviolet light or visible light incident on the light emitter layer 2 of the light reflector. Absorbs and emits light having an emission spectrum peak in the visible light region, so the wavelength distribution of the light emitted from the light source is different from the wavelength distribution of the reflected light emitted from the light reflector. It can be suitably used for applications where hue is important, such as lighting.

The light reflector is either a light emitter having an emission spectrum peak in the wavelength region of 400 to 470 nm in the light emitter layer 2 or a light emitter having an emission spectrum peak in the wavelength region of 570 to 700 nm. Alternatively, when both are contained, the light emitters absorb light incident on the light emitter layer 2 of the light reflector, and these light emitters have an emission spectrum peak in the wavelength region of 400 to 470 nm. One or both of light and light having an emission spectrum peak in the wavelength region of 570 to 700 nm are emitted.

Moreover, the incident light that has passed through the light emitter layer 2 without being absorbed by the light emitter is reflected by the light reflecting layer 1 toward the light emitter layer 2 and passes through the light emitter layer 2 again to the light emitter. Light that has been absorbed and emits light having the above-described emission spectrum is emitted, and among the light emitted by the light emitter, the light emitted to the light reflecting layer 1 side is also reflected by the light reflecting layer 1 to the light emitting layer 2 side. To do. Therefore, the light having the above emission spectrum emitted from the light emitter of the light emitter layer 2 is efficiently emitted from the light emitter layer 2.

Therefore, according to the light reflector A of the present invention, the light emitted from the light reflector A rather than the light incident on the light reflector A is 400 due to the light emitting action of the light emitter in the light emitter layer 2. Since the amount of light in the wavelength region of ˜470 nm or in the wavelength region of 570 to 700 nm is large, it becomes easier for human eyes to recognize blue or red light, which is inferior in visual sensitivity compared to green light, and a display device It can be suitably used for applications in which hue is important, such as lighting and lighting.

In the above description, the light reflector according to the present invention makes it easier for human eyes to recognize blue or red light, which has inferior visibility compared to green light. However, it can also be used for plant cultivation applications.

As described above, when the light reflector A of the present invention is irradiated with artificial light such as a fluorescent lamp or sunlight, a conventional white or silver light reflector is produced by the action of the light emitter included in the light emitter layer 2. The amount of light reflected by the light reflector A of the present invention is larger than that of the reflected light in one or both of the wavelength region of 400 to 470 nm and the wavelength region of 570 to 700 nm. Yes.

The light in the wavelength region of 400 to 470 nm and the light in the wavelength region of 570 to 700 nm are light effective for plant growth. Therefore, according to the light reflector of the present invention, sunlight, CCFL, fluorescence When cultivating plants using artificial light such as lamps, the plant can be irradiated with more light that is effective for the growth of plants, so that the growth of plants can be promoted, and It can be performed indoors as well as outdoors. Furthermore, when artificial light is used, the power consumption of the artificial light source can be reduced.

Furthermore, when the surface layer 3 is laminated and integrated on one surface of the light emitter layer 2, that is, the light incident surface side of the light reflector, the surface layer 3 contains a light reflective filler, and the light emitter The amount of light incident on the layer 2 is limited. Therefore, the light emitting action of the light emitter included in the light emitter layer 2 can be stably maintained over a long period of time, and the effect of changing the hue of the light reflected by the light reflector can be maintained over a long period of time. Can be sustained.

A light emitter in which a wavelength region of reflected light reflected at an interface between the synthetic resin constituting the surface layer and the light reflective filler contained in the surface layer is contained in the light emitter layer. In the case of overlapping with the light absorption wavelength region, the light that is incident on the light emitter layer but is not absorbed by the light emitter but is reflected by the light reflecting layer and emitted from the light emitter layer is again emitted by the surface layer. By reflecting the light in the direction of the light emitter layer, entering the light emitter layer, and absorbing the light in the light emitter layer, a larger amount of light is emitted from the light emitter, and as a result, reflected by the light reflector. The hue of light can be changed more reliably.

In addition, the light emitter in which the wavelength region of the reflected light reflected at the interface between the synthetic resin constituting the surface layer and the light reflective filler contained in the surface layer is contained in the light emitter layer. When the light emission wavelength region overlaps, light in the wavelength region emitted from the light emitter among the light incident on the light reflector is reflected outside the light reflector by the surface layer and emitted from the light emitter. The reflected light can be uniformly emitted to the outside of the light reflector while being irregularly reflected by the light reflective filler, and the hue of the reflected light from the light reflector can be changed more reliably and uniformly.

Moreover, the incident light that has passed through the light emitter layer 2 without being absorbed by the light emitter is reflected by the light reflecting layer 1 toward the light emitter layer 2 and passes through the light emitter layer 2 again to the light emitter. After being absorbed, the light emitter emits light to the visible light region, and among the light emitted from the light emitter, the light emitted to the light reflection layer 1 side is also reflected by the light reflection layer 1 to the light emitter layer 2 side. The Therefore, the light emitted from the light emitter of the light emitter layer 2 is reflected from the light emitter layer 2 to the surface layer 3 side and is efficiently emitted to the outside through the surface layer 3.

Therefore, according to the light reflector A of the present invention, the light emitting action of the light emitter in the light emitter layer 2 causes the light reflector A to emit light more than the amount of light incident on the light reflector A in the specific wavelength region in the visible light region. Since the amount of emitted light is larger, it can be suitably used for applications in which hue is important, such as a display device or illumination.

Next, an example of a lighting device using the light reflector A of the present invention will be described. As shown in FIG. 5, the lighting device L includes a light source B and a light reflector A disposed behind the light source B.

The light source B is not particularly limited as long as it can emit light in the ultraviolet region and / or the visible light region. For example, a cold cathode tube (CCFL), a fluorescent lamp, a light emitting diode (LED), a mercury lamp, an HID lamp An incandescent bulb may be used, but a fluorescent lamp is preferred because of its excellent light diffusion performance and luminous efficiency and low calorific value. In addition, the light source B may be used independently or 2 or more types may be used together.

Fluorescent lamps are generally classified into three-wavelength type and high color rendering type according to color rendering, white type, daylight type, day white type according to color, straight tube type, annular type, etc. depending on the shape. In the apparatus L, any kind of fluorescent lamp can be used.

Then, behind the light source B, as shown in FIG. 5, for example, a light reflector A formed or deformed into a convex arc shape is disposed at a predetermined interval from the light source B. The light reflector A absorbs part of the light emitted from the light source B, and emits light having a wavelength distribution different from the wavelength distribution of the light emitted from the light source B as reflected light.

The light emitter layer 2 contains either or both of a light emitter having an emission spectrum peak in the wavelength region of 400 to 470 nm and a light emitter having an emission spectrum peak in the wavelength region of 570 to 700 nm. In this case, the light emitted from the light source B and incident on the light emitter layer 2 of the light reflector is absorbed by the light emitters, and these light emitters have light having an emission spectrum peak in the wavelength region of 400 to 470 nm or 570. One or both of light having emission spectrum peaks in a wavelength region of ˜700 nm are emitted.

Therefore, according to the illuminating device L of the present invention, the light emitted from the light reflector A is more emitted from the light reflector A than the light emitted from the light source B and incident on the light reflector A. Due to the light-emitting action, the amount of light in the wavelength region of 400 to 470 nm or the wavelength region of 570 to 700 nm is large, so that the human eye recognizes blue or red light that is less visible than green light. It becomes easy and can be suitably used for applications in which hue is important.

As one of the above-mentioned applications in which the hue is regarded as important, for example, the above-described illumination device can be used for an illumination application for illuminating an article arranged on a merchandise display shelf arranged in a retail store or the like. In addition, it does not specifically limit as articles | goods, For example, foodstuffs, clothing, a noble metal product etc. are mentioned.

For example, when the illuminant included in the illuminant layer 2 is an illuminant having an emission spectrum peak in the wavelength region of 400 to 470 nm, blue light is emphasized as light emitted from the illumination device. Therefore, the articles placed on the merchandise display shelf can be visually recognized in a state close to a blue hue.

When the light emitter included in the light emitter layer 2 is a light emitter having an emission spectrum peak in the wavelength region of 570 to 700 nm, red light is emphasized as light emitted from the illumination device. Therefore, the articles placed on the merchandise display shelf can be visually recognized in a state close to a red hue.

In this way, by illuminating the article placed on the merchandise display shelf with the lighting device of the present invention, the merchandise value can be visually recognized in a state close to a blue or red hue, and the merchandise value can be improved.

For example, when a cold beverage is placed on a merchandise display shelf, the light emitter layer 2 contains an illuminant having an emission spectrum peak in the wavelength region of 400 to 470 nm, whereby the cold beverage is made blue. It can be visually recognized in a state close to the hue of the system, and the drink can be further promoted to promote sales of the drink.

In addition, when a warm beverage is arranged on the product display shelf, the warm beverage is made red by adding a luminous body having an emission spectrum peak in the wavelength region of 570 to 700 nm to the luminous body layer 2. It can be visually recognized in a state close to the hue of the system, and a beverage can be given a warmer impression to promote sales of the beverage.

In the above description, the light reflector A used in the illumination device L of the present invention makes it easier for human eyes to recognize blue or red light, which has poor visibility compared to green light. From this, it has been explained that it can be suitably used for applications in which hue is important, but it can also be suitably used for plant cultivation applications.

As described above, when the light reflector A is irradiated with light from the light source B of the lighting device L of the present invention, it is reflected by the conventional white or silver light reflector due to the action of the light emitter included in the light emitter layer 2. The amount of light reflected by the light reflector A is greater in one or both of the wavelength region of 400 to 470 nm and the wavelength region of 570 to 700 nm than the reflected light.

The light in the wavelength region of 400 to 470 nm and the light in the wavelength region of 570 to 700 nm are light that is effective for the growth of plants. Therefore, according to the lighting device L of the present invention, a cold cathode tube (CCFL) When plants are cultivated using artificial light such as fluorescent lamps, especially fluorescent lamps, the plant can be irradiated with more light that is effective for the growth of the plants, so that the growth of the plants can be promoted. Further, when artificial light, particularly fluorescent lamps are used, the power consumption of the light source can be reduced.

As described above, when the lighting device L of the present invention is used for plant cultivation, for example, as shown in FIG. 6, hydroponics with a predetermined interval in front of the light source B of the lighting device L Plant cultivation shelves C such as shelves and soil cultivation shelves may be arranged so that the reflected light emitted from the light reflector A is irradiated to the plants grown on the plant cultivation shelf C.

When a fluorescent lamp is used as the light source of the lighting device L, light is emitted from the fluorescent lamp radially in all directions, and the emitted light is reflected while being diffused by the light reflector A. The light required for the plants grown on the plant cultivation shelf C disposed in front of the light source B is irradiated almost uniformly, and the plants in the plant cultivation shelf C can be stably and reliably grown. .

Furthermore, in the plant cultivation lighting device L of FIG. 6, a gap is formed between the light reflector A and the plant cultivation shelf C, and the reflected light reflected by the light reflector A is other than the plant cultivation shelf C. Irradiation of the part may reduce the efficiency of plant cultivation.

In such a case, as shown in FIG. 7, the light reflector A formed in a convex arc shape in the plant cultivation lighting device L is used as the first light reflector A, and the first light reflector A The second light reflector D is disposed between both ends, that is, the curved ends A1 and A1 of the light reflector A and the plant cultivation shelf C, and the reflected light emitted from the first light reflector A is reflected. By reflecting the light reflected by the first light reflector A in the direction of the plant cultivation shelf C with the second light reflector D, the plant grown on the plant cultivation shelf C is efficiently irradiated to grow the plant. Can be made more reliable.

And since the light reflected by the second light reflector D is further diffused by the second light reflector D, the light necessary for the plants grown on the plant cultivation shelf C is more uniformly and reliably obtained. Can be irradiated.

As the second light reflector D, a light reflector having the same configuration as that of the first light reflector A may be used, or a light reflector having a configuration different from that of the first light reflector A may be used. Similarly to the first light reflector A, the second light reflector D is configured to emit light having a wavelength distribution different from the wavelength distribution of the light emitted from the light source B as reflected light. Preferably it is.

Since the light reflector of the present invention has the above-described configuration, it emphasizes light in a wavelength region different from the light emitted from the light source, and has a hue that cannot be expressed by conventional white and silver reflectors. For example, it can be suitably used in applications in which hue is important, such as illumination of articles placed on merchandise display shelves.

Furthermore, the light emitter layer of the light reflector is either a light emitter having an emission spectrum peak in the wavelength region of 400 to 470 nm or a light emitter having an emission spectrum peak in the wavelength region of 570 to 700 nm, or both. In the case where it contains, the reflected light is emphasized in the wavelength region of 400 to 470 nm (blue system) or in the wavelength region of 570 to 700 nm (red system), and is blue or red that is difficult to be recognized by human eyes Can be easily recognized. According to the light reflector, the hue of the illumination, the display device, and the object illuminated by them can be changed to a hue that could not be expressed by the conventional white and silver reflectors, and the hue of the display device and the illumination application, etc. It can be suitably used in applications where importance is attached.

Further, the light reflector has a reflected light amount that is higher than that of incident light in a wavelength region effective for plant growth, that is, in one or both of a wavelength region of 400 to 470 nm and a wavelength region of 570 to 700 nm. Is increasing. Therefore, according to the said light reflector, growth of a plant can be aimed at using sunlight or artificial light.

And since the illuminating device using the said light reflector does not need to increase the power consumption of a light source, it can aim at energy saving and suppresses the heat dissipated from a light source, and temperature control of the plant cultivation atmosphere Can be easily performed, and plant cultivation can be performed more reliably and efficiently.

Further, in the above light reflector, when the surface layer is provided, the amount of light incident on the light emitter layer is limited so that the light emitter in the light emitter layer does not absorb light more than necessary. The light emitting action of the light emitter is sustained over a long period of time so that the effect of changing the hue of the reflected light by the light reflector can be stably maintained over a long period of time.

It is the longitudinal cross-sectional view which showed the light reflector of this invention. It is the longitudinal cross-sectional view which showed another example of the light reflector of this invention. It is the longitudinal cross-sectional view which showed another example of the light reflector of this invention. It is the longitudinal cross-sectional view which showed another example of the light reflector of this invention. It is the model side view which showed the illuminating device of this invention. It is the model side view which showed the illuminating device for plant cultivation of this invention. It is the model side view which showed another example of the illuminating device for plant cultivation of this invention. It is the model side view which showed the illuminating device produced in the Example. 5 is a graph showing reflection spectra of light reflectors of Examples 1, 5, 7 and Comparative Example 1. FIG. 10 is a graph showing reflection spectra of light reflectors of Examples 16 to 18 and Comparative Example 3. It is the graph which showed the reflection spectrum of the light reflection board of Examples 21, 33, and 34. FIG. It is the graph which showed the reflection spectrum of the light reflecting plate of Examples 29, 35, and 36. It is the graph which showed the change of the maximum light reflectivity of the light reflection board accompanying the change of the light reflective filler amount in the light-emitting body layer of a light reflection board. It is the graph which showed the change of the maximum light reflectivity of the light reflection board accompanying the change of the light reflective filler amount in the light-emitting body layer of a light reflection board. It is the graph which showed the change of the maximum light reflectivity of the light reflection board accompanying the change of the light reflective filler amount in the light-emitting body layer of a light reflection board. It is the graph which showed the change of the maximum light reflectivity of the light reflection board accompanying the change of the light reflective filler amount in the light-emitting body layer of a light reflection board. It is the graph which showed the reflection spectrum of the light reflection board before and behind the accelerated exposure test in Example 55. It is the graph which showed the reflection spectrum of the light reflection board before and behind the accelerated exposure test in Example 56. It is the graph which showed the reflection spectrum of the light reflection board before and behind the accelerated exposure test in Example 57. It is the graph which showed the reflection spectrum of the light reflection board before and behind the accelerated exposure test in Example 67. 42 is a graph showing reflection spectra of a light reflector before and after an accelerated exposure test in Example 68.

Hereinafter, the embodiments of the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

Example 1
A thermoplastic resin composition for a phosphor layer containing 100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.) and 0.1 part by weight of a fluorescent dye (trade name “Hostalx KCB” manufactured by Clariant Co., Ltd.) as a light emitter. In the first extruder, 100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.) and a master batch containing rutile titanium oxide in an ethylene-propylene block copolymer (trade name “manufactured by Toyo Ink Co., Ltd.”) PPM 1KB662 WHT FD ”, ethylene-propylene block copolymer: 100 parts by weight of titanium oxide = 30% by weight: 70% by weight) A thermoplastic resin composition for a light reflection layer containing 100 parts by weight of polypropylene (Sun Aroma) Product name "PL500A") 24 parts by weight, polypropylene (Nippon Polypro) Product name “FB3312”) 76 parts by weight, masterbatch containing rutile titanium oxide in an ethylene-propylene block copolymer (trade name “PPM 1KB662 WHT FD”, manufactured by Toyo Ink Co., Ltd., ethylene-propylene block co-weight) A thermoplastic resin composition for a foam layer containing 25 parts by weight of titanium oxide = 30% by weight: 70% by weight) and 1.4 parts by weight of a mixture of sodium bicarbonate and citric acid as a foaming agent. Supplied to the three extruders and melt-kneaded. From the first to third extruders, the light emitting layer thermoplastic resin composition, the light reflecting layer thermoplastic resin composition, and the foam layer thermoplastic resin composition are joined together. A foamed resin layer having an annular cross section made of a thermoplastic resin composition for a foam layer, and laminated on the outer surface of the foamable resin layer and from a thermoplastic resin composition for a light reflecting layer A non-foaming resin layer having an annular cross section, and a laminated light emitting resin layer laminated on the outer surface of the non-foaming resin layer and made of a thermoplastic resin composition for a phosphor layer. The laminate was supplied to an annular die connected to a merging die and extruded and foamed into a cylindrical shape from the annular die to obtain a cylindrical foam.

Then, after gradually expanding the diameter of the cylindrical foam, it is supplied to the cooling mandrel and cooled while being molded, and then the cylindrical foam is continuously inner and outer peripheral surfaces in the extrusion direction at two opposing points in the radial direction. A plate-like light reflector having an overall density of 0.7 g / cm ³ was obtained by cutting open and expanding.

In the light reflector, a non-foamed sheet 1a having a thickness of 0.15 mm made of a non-foamable resin layer is laminated and integrated on one surface of a foam sheet 1b having a thickness of 0.5 mm formed by foaming a foamable resin layer. The light reflecting layer 1 and the light emitting layer 2 having a thickness of 0.05 mm formed by being laminated and integrated on the non-foamed sheet 1a of the light reflecting layer 1 and formed of a light emitting resin layer.

(Example 2)
A light reflector was obtained in the same manner as in Example 1 except that 1 part by weight of a fluorescent pigment (trade name “FX-301”, manufactured by Sinloihi) was used instead of the fluorescent dye.

(Example 3)
A light reflector was obtained in the same manner as in Example 1 except that 1 part by weight of a fluorescent pigment (trade name “FX-303” manufactured by Sinloihi) was used instead of the fluorescent dye as the luminescent material.

Example 4
A light reflector was obtained in the same manner as in Example 1 except that 65 parts by weight of a fluorescent pigment (trade name “FX-303” manufactured by Sinloihi) was used instead of the fluorescent dye as the luminescent material.

(Example 5)
A light reflector was obtained in the same manner as in Example 1 except that 1 part by weight of a fluorescent pigment (trade name “FX-307”, manufactured by Sinloihi) was used instead of the fluorescent dye as the luminescent material.

(Example 6)
A light reflector was obtained in the same manner as in Example 1 except that 1 part by weight of a fluorescent pigment (trade name “FX-327”, manufactured by Sinlohi) was used instead of the fluorescent dye as the luminescent material.

(Example 7)
Instead of using a fluorescent dye alone as a luminescent material, 0.1 part by weight of a fluorescent dye (trade name “Hostalx KCB” manufactured by Clariant) and 1 part by weight of a fluorescent pigment (trade name “FX-307” manufactured by Sinloihi) A light reflector was obtained in the same manner as in Example 1 except that was used together.

(Example 8)
Instead of using a fluorescent dye alone as the illuminant, 0.1 part by weight of a fluorescent dye (trade name “Hostalx KCB” manufactured by Clariant) and 1 part by weight of a fluorescent pigment (trade name “FX-327” manufactured by Sinroich) A light reflector was obtained in the same manner as in Example 1 except that was used together.

Example 9
A thermoplastic resin composition for a luminous body layer containing 100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.) and 0.1 part by weight of a fluorescent dye (trade name “Hostax KCB” manufactured by Clariant Co., Ltd.) as a light emitter. In the first extruder, 100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.) and a master batch containing rutile titanium oxide in an ethylene-propylene block copolymer (trade name “manufactured by Toyo Ink Co., Ltd.”) PPM 1KB662 WHT FD ", ethylene-propylene block copolymer: titanium oxide = 30 wt%: 70 wt%) 100 parts by weight of thermoplastic resin composition for light reflecting layer is supplied to the second extruder and melted Kneading, from the first and second extruders, the thermoplastic resin composition for the phosphor layer and the thermoplastic resin composition for the light reflection layer Extruded into a flow die to form a laminated sheet in which a light emitting resin layer made of a thermoplastic resin composition for a light emitter layer is laminated on a non-foamable resin layer made of a thermoplastic resin composition for a light reflecting layer. The laminated sheet was supplied to a T die connected to a merging die, and a light reflector having an overall density of 1.3 g / cm ³ was coextruded from the T die. The light reflector was taken up so that the thickness was 0.2 mm.

The light reflector is formed of a non-foaming resin layer and has a thickness of 0.15 mm. The light reflecting layer 1 is laminated and integrated on the light reflecting layer 1 and is formed of a light emitting resin layer. Of the phosphor layer 2 having a thickness of 0.05 mm.

(Example 10)
A light reflector was obtained in the same manner as in Example 9 except that 1 part by weight of a fluorescent pigment (trade name “FX-301”, manufactured by Sinloihi) was used instead of the fluorescent dye as the luminescent material.

Example 11
A light reflector was obtained in the same manner as in Example 9, except that 1 part by weight of a fluorescent pigment (trade name “FX-303”, manufactured by Sinloihi) was used instead of the fluorescent dye as the luminescent material.

(Example 12)
A light reflector was obtained in the same manner as in Example 9 except that 1 part by weight of a fluorescent pigment (trade name “FX-307” manufactured by Sinloihi) was used instead of the fluorescent dye as the luminescent material.

(Example 13)
A light reflector was obtained in the same manner as in Example 9 except that 1 part by weight of a fluorescent pigment (trade name “FX-327”, manufactured by Sinloihi) was used instead of the fluorescent dye as the luminescent material.

(Example 14)
Instead of using a fluorescent dye alone as the illuminant, 0.1 part by weight of a fluorescent dye (trade name “Hostalx KCB” manufactured by Clariant) and 1 part by weight of a fluorescent pigment (trade name “FX-307” manufactured by Sinroich) A light reflector was obtained in the same manner as in Example 9 except that was used together.

(Example 15)
Instead of using a fluorescent dye alone as the illuminant, 0.1 part by weight of a fluorescent dye (trade name “Hostalx KCB” manufactured by Clariant) and 1 part by weight of a fluorescent pigment (trade name “FX-327” manufactured by Sinroich) A light reflector was obtained in the same manner as in Example 9 except that was used together.

(Comparative Example 1)
A light reflector was obtained in the same manner as in Example 1 except that the light emitter was not used.

(Comparative Example 2)
A light reflector was obtained in the same manner as in Example 9 except that the light emitter was not used.

(Example 16)
A plate-like light reflector was obtained in the same manner as in Example 1. The obtained plate-shaped light reflector was cut into a planar rectangular shape having a short side of 50 cm and a long side of 120 cm. On the other hand, an iron support member E formed in a convex arc shape over the entire length in the long side direction is prepared, and the light reflector is exposed on the inner surface of the support member E. A convex arc-shaped light reflector A was manufactured by laminating and integrating them while being deformed into a convex arc shape along the support member E (see FIG. 8).

Next, the fluorescent lamp B is disposed in front of the light-emitting body layer 2 of the light reflector A, and the fluorescent lamp B is electrically connected to a socket portion (not shown) attached to the support member. L was produced. And the hydroponic cultivation shelf was arrange | positioned ahead of the illuminating device L, and it was used for plant cultivation.

(Example 17)
An illuminator L was produced in the same manner as in Example 16 except that 1 part by weight of a fluorescent pigment (trade name “FX-307”, manufactured by Sinloihi) was used instead of the fluorescent dye as the luminescent material. And the hydroponic cultivation shelf was arrange | positioned ahead of the illuminating device L, and it was used for plant cultivation.

(Example 18)
Instead of using a fluorescent dye alone as the illuminant, 0.1 part by weight of a fluorescent dye (trade name “Hostalx KCB” manufactured by Clariant) and 1 part by weight of a fluorescent pigment (trade name “FX-307” manufactured by Sinroich) A lighting device L was produced in the same manner as in Example 16 except that the above was used together. And the hydroponic cultivation shelf was arrange | positioned ahead of the illuminating device L, and it was used for plant cultivation.

(Comparative Example 3)
A lighting device L was produced in the same manner as in Example 16 except that the light emitter was not used.

For the obtained light reflector and lighting device, the light reflectance was measured in the following manner, and the results are shown in Table 1 and FIGS. FIG. 9 shows only the results of Examples 1, 5, and 7 and Comparative Example 1. FIG. 10 shows only the results of Examples 16, 17, 18 and Comparative Example 3. Further, the total light reflectance in the light reflection layer of the obtained light reflector and the average light transmittance in the wavelength region of 360 to 740 nm were measured in the following manner, and the results are shown in Table 1.

(Light reflectance)
A spectrocolorimeter (trade name “CM-2600d” manufactured by Konica Minolta Co., Ltd.) is used to measure the light reflectance of the light reflector, and in accordance with JIS Z 8722, the room temperature of the measurement atmosphere is 20 ° C. Under the condition of relative humidity of 60%, the light reflectance of the light reflector was measured every 10 nm in the wavelength region of 360 to 740 nm.

In the obtained light reflectance, the maximum light reflectance was determined in the wavelength region of 400 to 470 nm and the wavelength region of 570 to 700 nm, and the minimum light reflectance was determined in the wavelength region of 470 to 570 nm.

A difference Δ ₁ between the maximum light reflectance in the wavelength region of 400 to 470 nm and the minimum light reflectance in the wavelength region of 470 to 570 nm is calculated, and the maximum light reflectance in the wavelength region of 570 to 700 nm is calculated from 470 to 570 nm. The difference Δ ₂ from the minimum light reflectance in the wavelength region was calculated.

(Total light reflectance of light reflecting layer and average light transmittance in wavelength region of 360 to 740 nm)
A test sheet having the same configuration and the same thickness as the light reflecting layer of the light reflector was extruded. A spectroscopic colorimeter (trade name “CM-2600d” manufactured by Konica Minolta Co., Ltd.) was used to measure the total light reflectance of the obtained test sheet, and the measurement atmosphere temperature was 20 ° C. and relative humidity was 60 according to JIS Z8722. %, The light reflectance of the test sheet was measured every 10 nm in the wavelength region of 360 to 740 nm. In the obtained light reflectivity, an arithmetic average value of the light reflectivities in the wavelength region of 360 to 740 nm was obtained and used as the total light reflectivity of the light reflection layer.

In addition, a spectrophotometer (trade name “UV-2450” manufactured by Shimadzu Corporation) was used to measure the light transmittance of the obtained test sheet, and the measurement atmosphere temperature was 20 ° C. and relative humidity was 60 according to JIS Z8722. %, The light transmittance of the test sheet was measured every 1 nm in the wavelength region of 360 to 740 nm. In the obtained light transmittance, the arithmetic average value of the light transmittance in the wavelength region of 360 to 740 nm was obtained and used as the average light transmittance of the light reflecting layer.

(Examples 19 to 36)
100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd., refractive index: 1.48), a predetermined amount of fluorescent dye (trade name “OB” manufactured by Ciba Specialty Chemicals Co., Ltd.) shown in Table 2 as a light emitter, or fluorescent pigment (Product name “FX-327” manufactured by Sinloihi) and a thermoplastic resin composition for a phosphor layer containing a predetermined amount of rutile-type titanium oxide (refractive index: 2.71) shown in Table 2 A master batch (trade name “PPM 1KB662 manufactured by Toyo Ink Co., Ltd.”) containing 100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.) and an ethylene-propylene block copolymer containing rutile titanium oxide in an extruder. WHT FD ", ethylene-propylene block copolymer: titanium oxide = 30 wt%: 70 wt%) 100 parts by weight 25 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.), 75 parts by weight of polypropylene (trade name “FB3312” manufactured by Nippon Polypro Co., Ltd.), ethylene-propylene Master batch containing rutile-type titanium oxide in block copolymer (trade name “PPM 1KB662 WHT FD” manufactured by Toyo Ink Co., Ltd., ethylene-propylene block copolymer: titanium oxide = 30 wt%: 70 wt%) 20 A thermoplastic resin composition for a foam layer containing 1.4 parts by weight of a mixture of sodium bicarbonate and citric acid as a foaming agent is supplied to a third extruder and melt-kneaded. From the three extruders, the thermoplastic resin composition for the light emitter layer, the thermoplastic resin composition for the light reflecting layer, and the thermoplastic resin composition for the foam layer are joined together. A foamed resin layer having an annular cross section made of a thermoplastic resin composition for a foam layer, and an annular cross section made of a thermoplastic resin composition for a light reflecting layer laminated on the outer surface of the foamable resin layer. A laminate comprising a non-foamable resin layer and a light-emitting resin layer having an annular cross-section made of a thermoplastic resin composition for a phosphor layer and laminated on the outer surface of the non-foamable resin layer is formed. The product was supplied to an annular die connected to a confluence die and extruded and foamed into a cylindrical shape from the annular die to obtain a cylindrical foam.

Then, after gradually expanding the diameter of the cylindrical foam, it is supplied to the cooling mandrel and cooled while being molded, and then the cylindrical foam is continuously inner and outer peripheral surfaces in the extrusion direction at two opposing points in the radial direction. A light reflector having an overall density of 0.7 g / cm ³ was obtained by cutting open and expanding.

Fluorescent dye (trade name “OB” manufactured by Ciba Specialty Chemicals Co., Ltd.) absorbed light in the ultraviolet region and had an emission wavelength region of 400 to 500 nm. The fluorescent pigment (trade name “FX-327” manufactured by Sinloihi) absorbed light in the visible light region and had an emission wavelength region of 570 to 710 nm. In the phosphor layer 2, the reflection wavelength region of the reflected light reflected at the interface between polypropylene and rutile titanium oxide was 380 to 780 nm.

(Examples 37 to 54)
100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd., refractive index: 1.48), a predetermined amount of fluorescent dye (trade name “OB” manufactured by Ciba Specialty Chemicals Co., Ltd.) shown in Table 2 as a light emitter, or fluorescent pigment (Product name “FX-327” manufactured by Sinloihi) and a thermoplastic resin composition for a phosphor layer containing a predetermined amount of rutile-type titanium oxide (refractive index: 2.71) shown in Table 2 A master batch (trade name “PPM 1KB662 manufactured by Toyo Ink Co., Ltd.”) containing 100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.) and an ethylene-propylene block copolymer containing rutile titanium oxide in an extruder. WHT FD ", ethylene-propylene block copolymer: titanium oxide = 30 wt%: 70 wt%) 100 parts by weight The thermoplastic resin composition for the light reflection layer is supplied to the second extruder and melt-kneaded, and the thermoplastic resin composition for the light emitter layer and the thermoplastic resin composition for the light reflection layer are merged from the first and second extruders. Extruded into a die to form a laminated sheet in which a light emitting resin layer made of a thermoplastic resin composition for a light emitter layer is laminated on a non-foamable resin layer made of a thermoplastic resin composition for a light reflecting layer. The sheet was supplied to a T die connected to a joining die, and a light reflector having an overall density of 1.3 g / cm ³ was coextruded from the T die. The light reflector was taken up so that the thickness was 0.2 mm.

For the obtained light reflector, the light reflectance and the maximum light reflectance were measured in the following manner, and the results are shown in Table 2 and FIGS. Further, the total light reflectance in the light reflecting layer of the obtained light reflector and the average light transmittance in the wavelength region of 360 to 740 nm were measured in the same manner as described above, and the results are shown in Table 2.

FIG. 11 shows the reflection spectra of Examples 21, 33, and 34. FIG. 12 shows the reflection spectra of Examples 29, 35, and 36. FIG. 13 shows the results of plotting the maximum light reflectance of Examples 19 to 25, 33 and 34 against the amount of rutile titanium oxide added. FIG. 14 shows the results of plotting the maximum light reflectance of Examples 26 to 32, 35 and 36 against the amount of rutile titanium oxide added. FIG. 15 shows the results of plotting the maximum light reflectance of Examples 37 to 43, 51 and 52 against the amount of added rutile titanium oxide. FIG. 16 shows the results of plotting the maximum light reflectance of Examples 44 to 50, 53 and 54 against the addition amount of rutile-type titanium oxide.

In the obtained light reflectance, the maximum light reflectance was determined in the wavelength region of 360 to 740 nm.

(Example 55)
Master batch (trade name “PPM 1KB662 WHT FD”, manufactured by Toyo Ink Co., Ltd.), ethylene-propylene block copolymer containing 100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.), ethylene-propylene block copolymer Propylene block copolymer: Rutile-type titanium oxide = 30% by weight: 70% by weight) 100 parts by weight, UV absorber (trade name “Tinuvin 234” manufactured by Ciba Specialty Chemicals) and light stabilizer (Ciba Specialty) Chemicals Co., Ltd., trade name “CHIMASSORB 119”) The thermoplastic resin composition for light reflecting layer containing 0.2 parts by weight is supplied to the first extruder and melt-kneaded to obtain polypropylene (trade name “PL500A”, manufactured by Sun Allomer Co., Ltd.). 100 parts by weight, luminous body (fluorescent pigment manufactured by Sinloihi) Product name “FX-303”) 1 part by weight, UV absorber (trade name “Tinuvin 234” manufactured by Ciba Specialty Chemicals) 0.1 part by weight and light stabilizer (trade name “CHIMASSORB 119” manufactured by Ciba Specialty Chemicals) 0 A thermoplastic resin composition for a phosphor layer containing 1 part by weight is supplied to a second extruder and melt-kneaded, and 100 parts by weight of polypropylene (trade name “PL500A”, refractive index: 1.48) manufactured by Sun Allomer Co., Ltd. As a light-reflective filler, 1 part by weight of rutile type titanium oxide (refractive index: 2.71), 0.1 part by weight of an ultraviolet absorber (trade name “Tinuvin 234” manufactured by Ciba Specialty Chemicals) and a light stabilizer (Ciba Specialty Chemicals) Product name “CHIMASSORB 119” manufactured by the company) Thermoplastic resin composition for surface layer containing 0.1 part by weight Is supplied to the third extruder and melt-kneaded, and the thermoplastic resin composition for the light reflecting layer, the thermoplastic resin composition for the light emitting layer, and the surface layer are joined to the confluence die connecting the first to third extruders. The thermoplastic resin composition is supplied and coextruded from the T-die connected to the converging die, so that the light reflecting layer 1 made of the thermoplastic resin composition for the light reflecting layer is formed on one surface of the light reflecting layer 1. A light emitting layer 2 which is laminated and integrated and is made of a thermoplastic resin composition for a light emitting layer, and a surface layer 3 which is laminated and integrated on one surface of the light emitting layer 2 and is made of a thermoplastic resin composition for a surface layer. A light reflector was produced.

The light reflector has a total thickness of 0.25 mm, a density of 1.3 g / cm ³ , a light reflection layer 1 thickness of 0.15 mm, a light emitter layer 2 thickness of 0.05 mm, and a surface. The thickness of layer 3 was 0.05 mm.

Fluorescent pigment (trade name “FX-303” manufactured by Sinloihi) absorbed light in the visible light region and had an emission wavelength region of 570 to 710 nm. In the surface layer 3, the reflection wavelength region of the reflected light reflected at the interface between polypropylene and rutile titanium oxide was 380 to 780 nm.

(Example 56)
A light reflector was produced in the same manner as in Example 55 except that the amount of rutile titanium oxide in the thermoplastic resin composition for the surface layer was 8 parts by weight instead of 1 part by weight.

(Example 57)
A light reflector was produced in the same manner as in Example 55 except that the amount of rutile-type titanium oxide in the thermoplastic resin composition for the surface layer was 16 parts by weight instead of 1 part by weight.

(Example 58)
25 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.), 75 parts by weight of polypropylene (trade name “FB3312” manufactured by Nippon Polypro Co., Ltd.), a masterbatch containing rutile titanium oxide in an ethylene-propylene block copolymer (Trade name “PPM 1KB662 WHT FD” manufactured by Toyo Ink Co., Ltd.) ethylene-propylene block copolymer: rutile type titanium oxide = 30 wt%: 70 wt%, 25 parts by weight, ultraviolet absorber (trade name “Ciba Specialty Chemicals, Inc. Tinuvin 234 ”) 0.1 parts by weight, light stabilizer (trade name“ CHIMASORB 119 ”manufactured by Ciba Specialty Chemicals Co., Ltd.) 0.1 parts by weight, and 1.4 parts by weight of a mixture of sodium bicarbonate and citric acid as a blowing agent Expandable thermoplastic resin composition into the first extruder 100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.), 1 part by weight of a phosphor (trade name “FX-303” manufactured by Sinloihi Co., Ltd.), an ultraviolet absorber (Ciba Specialty Chemicals Co., Ltd.) Product name “Tinuvin 234”) 0.1 parts by weight and light stabilizer (product name “CHIMASORB 119”, manufactured by Ciba Specialty Chemicals Co., Ltd.) 0.1 parts by weight To 100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.), 1 part by weight of rutile titanium oxide as a light-reflective filler, and ultraviolet absorber (trade name “Tinvin 234 manufactured by Ciba Specialty Chemicals Co., Ltd.). ]) 0.1 parts by weight and light stabilizer (manufactured by Ciba Specialty Chemicals) (Product name “CHIMASSORB 119”) The thermoplastic resin composition for the surface layer containing 0.1 part by weight is supplied to a third extruder, melted and kneaded, and extruded to a converging die connected to the first to third extruders. A cylindrical laminate in which the thermoplastic resin composition for the surface layer, the thermoplastic resin composition for the light emitter layer, and the foamable thermoplastic resin composition are laminated in this order from the outside to the inside, and this cylinder The cylindrical laminate is produced by extrusion foaming from an annular die attached to the tip of the converging die, and the cylindrical body is gradually expanded and then supplied to the cooling mandrel for cooling. The light-reflecting layer 1 made of a foamed sheet obtained by foaming a foamable thermoplastic resin composition by continuously cutting in the extruding direction between the inner and outer peripheral surfaces, and opening and developing the foamed thermoplastic resin composition. Laminated on one side of the reflective layer 1 And a surface layer 3 that is laminated and integrated on one surface of the light-emitting layer 2 and is made of the surface-layer thermoplastic resin composition. A light reflector was manufactured.

The light reflector has a total thickness of 0.6 mm, a density of 0.6 g / cm ³ , a light reflection layer 1 thickness of 0.5 mm, a light emitter layer 2 thickness of 0.05 mm, and a surface. The thickness of layer 3 was 0.05 mm.

(Example 59)
A light reflector was produced in the same manner as in Example 58 except that the amount of rutile-type titanium oxide in the thermoplastic resin composition for the surface layer was 8 parts by weight instead of 1 part by weight.

(Example 60)
A light reflector was produced in the same manner as in Example 58 except that the amount of rutile-type titanium oxide in the thermoplastic resin composition for the surface layer was changed to 16 parts by weight instead of 1 part by weight.

(Example 61)
Master batch (trade name “PPM 1KB662 WHT FD”, manufactured by Toyo Ink Co., Ltd.), ethylene-propylene block copolymer containing 100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.), ethylene-propylene block copolymer Propylene block copolymer: Titanium oxide = 30% by weight: 70% by weight) 100 parts by weight, UV absorber (trade name “Tinuvin 234” manufactured by Ciba Specialty Chemicals) 0.2 part by weight and light stabilizer (Ciba Specialty Chemicals) (Product name “CHIMASSORB 119”)) 0.2 parts by weight of thermoplastic resin composition for light reflecting layer is supplied to the first extruder, melt-kneaded, and polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.) 100 Parts by weight, illuminant (fluorescent pigment manufactured by Sinloihi) Name “FX-303”) 1 part by weight, UV absorber (trade name “Tinuvin 234” manufactured by Ciba Specialty Chemicals) 0.1 part by weight and light stabilizer (trade name “CHIMASSORB 119” manufactured by Ciba Specialty Chemicals) A thermoplastic resin composition for a phosphor layer containing 1 part by weight is supplied to a second extruder and melt-kneaded, 100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.), rutile type as a light reflective filler. 1 part by weight of titanium oxide, 0.1 part by weight of ultraviolet absorber (trade name “Tinuvin 234” manufactured by Ciba Specialty Chemicals) and 0.1 part by weight of light stabilizer (trade name “CHIMASSORB 119” manufactured by Ciba Specialty Chemicals) The thermoplastic resin composition for the surface layer is supplied to a third extruder, melted and kneaded, and 50 parts by weight of pyrene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.), 50 parts by weight of polypropylene (trade name “FB3312” manufactured by Nippon Polypro Co., Ltd.), 0.1 weight of ultraviolet absorber (trade name “Tinvin 234” manufactured by Ciba Specialty Chemicals) Part, 0.1 parts by weight of light stabilizer (trade name “CHIMASSORB 119” manufactured by Ciba Specialty Chemicals) and 1 part by weight of a mixture of sodium bicarbonate and citric acid as a foaming agent Supply to a four extruder, melt knead, and extrude to a converging die connected to the first to fourth extruders, surface layer thermoplastic resin composition, phosphor layer thermoplastic resin composition, light reflecting layer A cylindrical laminate in which the thermoplastic resin composition and the foamable thermoplastic resin composition are laminated in this order from the outside to the inside; The cylindrical laminate is extruded and foamed from an annular die attached to the tip of the converging die to produce a cylindrical body, and the cylindrical body is gradually expanded and then supplied to the cooling mandrel for cooling. The cylindrical body is continuously cut in the extruding direction between the inner and outer peripheral surfaces, cut open, and developed, so that the light reflecting layer 1 made of the thermoplastic resin composition for the light reflecting layer and the light reflecting layer 1 A light emitter layer 2 laminated and integrated on one surface and made of a thermoplastic resin composition for a light emitter layer, and a surface layer 3 laminated and integrated on one surface of the light emitter layer 2 and made of a thermoplastic resin composition for a surface layer. And a foam layer 4 laminated and integrated on the other surface of the light reflection layer and foamed with a foamable thermoplastic resin composition.

The light reflector has an overall thickness of 0.65 mm, a density of 0.7 g / cm ³ , a light reflection layer 1 thickness of 0.15 mm, a light emitter layer 2 thickness of 0.05 mm, and a surface. The thickness of the layer 3 was 0.05 mm, and the thickness of the foam layer was 0.4 mm.

(Example 62)
A light reflector was produced in the same manner as in Example 61 except that the amount of rutile-type titanium oxide in the thermoplastic resin composition for the surface layer was 8 parts by weight instead of 1 part by weight.

(Example 63)
A light reflector was produced in the same manner as in Example 61 except that the amount of rutile-type titanium oxide in the thermoplastic resin composition for the surface layer was 16 parts by weight instead of 1 part by weight.

(Example 64)
Master batch (trade name “PPM 1KB662 WHT FD”, manufactured by Toyo Ink Co., Ltd.), ethylene-propylene block copolymer containing 100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.), ethylene-propylene block copolymer Propylene block copolymer: Titanium oxide = 30% by weight: 70% by weight) 100 parts by weight, UV absorber (trade name “Tinuvin 234” manufactured by Ciba Specialty Chemicals) 0.2 part by weight and light stabilizer (Ciba Specialty Chemicals) (Product name “CHIMASSORB 119”)) 0.2 parts by weight of thermoplastic resin composition for light reflecting layer is supplied to the first extruder, melt-kneaded, and polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.) 100 Parts by weight, illuminant (fluorescent pigment manufactured by Sinloihi) Name “FX-303”) 1 part by weight, UV absorber (trade name “Tinuvin 234” manufactured by Ciba Specialty Chemicals) 0.1 part by weight and light stabilizer (trade name “CHIMASSORB 119” manufactured by Ciba Specialty Chemicals) A thermoplastic resin composition for a phosphor layer containing 1 part by weight is supplied to a second extruder and melt-kneaded, 100 parts by weight of polypropylene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.), rutile type as a light reflective filler. 1 part by weight of titanium oxide, 0.1 part by weight of ultraviolet absorber (trade name “Tinuvin 234” manufactured by Ciba Specialty Chemicals) and 0.1 part by weight of light stabilizer (trade name “CHIMASSORB 119” manufactured by Ciba Specialty Chemicals) The thermoplastic resin composition for the surface layer is supplied to a third extruder, melted and kneaded, and 25 parts by weight of pyrene (trade name “PL500A” manufactured by Sun Allomer Co., Ltd.), 75 parts by weight of polypropylene (trade name “FB3312” manufactured by Nippon Polypro Co., Ltd.), a masterbatch containing rutile titanium oxide in an ethylene-propylene block copolymer (Trade name “PPM 1KB662 WHT FD” manufactured by Toyo Ink Co., Ltd.) ethylene-propylene block copolymer: rutile type titanium oxide = 30 wt%: 70 wt%, 25 parts by weight, ultraviolet absorber (trade name “Ciba Specialty Chemicals, Inc. Tinuvin 234 ”) 0.1 parts by weight, light stabilizer (trade name“ CHIMASORB 119 ”manufactured by Ciba Specialty Chemicals Co., Ltd.) 0.1 parts by weight, and 1.4 parts by weight of a mixture of sodium bicarbonate and citric acid as a blowing agent Supplying the foamable thermoplastic resin composition to the fourth extruder Melting and kneading and extruding to a converging die connected with first to fourth extruders, surface layer thermoplastic resin composition, phosphor layer thermoplastic resin composition, light reflecting layer thermoplastic resin composition and A cylindrical laminate is formed by laminating a foamable thermoplastic resin composition in this order from the outside to the inside, and the cylindrical laminate is extruded and foamed from an annular die attached to the tip of a converging die. After the cylindrical body is gradually enlarged and supplied to the cooling mandrel for cooling, the cylindrical body is continuously cut in the extruding direction between the inner and outer peripheral surfaces, opened and developed. A foam sheet 1b formed by foaming a foamable thermoplastic resin composition, and a non-foamed sheet 1a made of a thermoplastic resin composition for a light reflecting layer laminated and integrated on one surface of the foam sheet 1b. Reflective layer 1 and this light A light-emitting layer 2 made of a thermoplastic resin composition for a light-emitting body layer, which is laminated and integrated on one surface of the layer 1, and a thermoplastic resin composition for a surface layer, laminated and integrated on one surface of the light-emitting body layer 2. A light reflector made of the surface layer 3 was produced.

The light reflector has a total thickness of 0.75 mm, a density of 0.7 g / cm ³ , a non-foamed sheet 1a constituting the light reflecting layer 1 has a thickness of 0.15 mm, and a foamed sheet The thickness of 1b was 0.5 mm, the thickness of the light emitter layer 2 was 0.05 mm, and the thickness of the surface layer 3 was 0.05 mm.

(Example 65)
A light reflector was produced in the same manner as in Example 64 except that the amount of rutile-type titanium oxide in the thermoplastic resin composition for the surface layer was 8 parts by weight instead of 1 part by weight.

Example 66
A light reflector was produced in the same manner as in Example 64 except that the amount of rutile-type titanium oxide in the thermoplastic resin composition for the surface layer was 16 parts by weight instead of 1 part by weight.

(Example 67)
A light reflector was obtained in the same manner as in Example 55 except that the third extruder was not connected to the joining die and the surface layer was not formed.

Example 68
A light reflector was produced in the same manner as in Example 55 except that the thermoplastic resin composition for the surface layer did not contain rutile titanium oxide.

(Example 69)
A light reflector was produced in the same manner as in Example 58 except that the third extruder was not connected to the converging die and the surface layer was not formed.

(Example 70)
A light reflector was produced in the same manner as in Example 58 except that the thermoplastic resin composition for the surface layer did not contain rutile titanium oxide.

(Example 71)
A light reflector was produced in the same manner as in Example 61 except that the third extruder was not connected to the converging die and the surface layer was not formed.
(Example 72)
A light reflector was produced in the same manner as in Example 61 except that the surface layer thermoplastic resin composition did not contain rutile titanium oxide.

(Example 73)
A light reflector was obtained in the same manner as in Example 64 except that the third extruder was not connected to the converging die and the surface layer was not formed.

(Example 74)
A light reflector was produced in the same manner as in Example 64, except that the surface layer thermoplastic resin composition did not contain rutile titanium oxide.

For the obtained light reflector, the light reflectance, the maximum light reflectance, and the average light transmittance in the wavelength region of 360 to 740 nm in the surface layer were measured in the following manner, and the results are shown in Tables 3, 4 and It is shown in FIGS. Tables 3 and 4 list the total content of titanium oxide contained in the light reflecting layer. For the obtained light reflector, the total light reflectance of the light reflecting layer and the average light transmittance in the wavelength region of 360 to 740 nm were measured in the same manner as described above, and the results are shown in Tables 3 and 4.

FIG. 17 shows the reflection spectra before and after the accelerated exposure test of Example 55. FIG. 18 shows the reflection spectra before and after the accelerated exposure test of Example 56. FIG. 19 shows the reflection spectra before and after the accelerated exposure test of Example 57. FIG. 20 shows the reflection spectra before and after the accelerated exposure test of Example 67. FIG. 21 shows the reflection spectra before and after the accelerated exposure test of Example 68.

(Average light transmittance of surface layer)
A test sheet having the same configuration and the same thickness as the surface layer of the light reflector was extruded. For the measurement of the light transmittance of the obtained test sheet, a spectrophotometer (trade name “UV-2450” manufactured by Shimadzu Corporation) was used, and the temperature of the measurement atmosphere was 20 ° C. and the relative humidity was 60% in accordance with JIS Z8722. Under the conditions, the light transmittance of the test sheet was measured every 1 nm in the wavelength region of 360 to 740 nm. In the obtained light transmittance, the arithmetic average value of the light transmittance in the wavelength region of 360 to 740 nm was determined and used as the average light transmittance of the surface layer.

(Light reflectance)
A spectrocolorimeter (trade name “CM-2600d” manufactured by Konica Minolta Co., Ltd.) is used to measure the light reflectance of the light reflector, and in accordance with JIS Z8722, the room temperature of the measurement atmosphere is 20 ° C. The light reflectance of the light reflector was measured every 10 nm in the wavelength region of 360 to 740 nm under the condition where the humidity was 60%.

In the obtained light reflectivity, the maximum light reflectivity was determined in the wavelength region of 360 to 740 nm, and the results are shown in the columns of “Before accelerated exposure test” in Tables 3 and 4.

Furthermore, using an accelerated exposure tester (trade name “Sunshine Super Long Life Weather Meter WEL-SUN-HC / B type” manufactured by Suga Test Instruments Co., Ltd.), the test tank has a set temperature of 50 ° C. according to JIS K7350-4. The accelerated exposure test was performed by adjusting the surface relative humidity of 20% and irradiating the surface layer of the light reflector with carbon arc lamp light for 100 hours. In addition, about the light reflector of Example 67, 69, 71, 73, the light-emitting body layer was irradiated with light.

Next, for the light reflector after the accelerated exposure test, the maximum light reflectance in the wavelength region of 360 to 740 nm was determined in the same manner as described above, and the results were listed in the columns of “After accelerated exposure test” in Tables 3 and 4. .

The present invention emphasizes light in a wavelength region different from the light emitted from the light source, and is suitable for applications in which hue is important, for example, illumination use of articles placed on a product display shelf, use of a display device, etc. Can be used.

DESCRIPTION OF SYMBOLS 1 Light reflection layer 2 Light-emitting body layer 3 Surface layer A Light reflector, 1st light reflector
A1 Curved end B Light source C Plant cultivation shelf D Second light reflector L Lighting device, Plant cultivation lighting device

Claims

A light reflector characterized by emitting light having a wavelength distribution different from that of light emitted from a light source as reflected light.
The light reflector according to claim 1, wherein the light reflector absorbs light emitted from the light source and emits fluorescence or phosphorescence.
2. The light reflector includes a light reflecting layer and a light emitting layer containing a light emitting body that is laminated and integrated on the light reflecting layer and emits light in a visible light region. The light reflector as described in.
The illuminant that emits light in the visible light region is either an illuminant having an emission spectrum peak in the wavelength region of 400 to 470 nm or an illuminant having an emission spectrum peak in the wavelength region of 570 to 700 nm. It contains, The light reflector of Claim 3 characterized by the above-mentioned.
The phosphor that emits light in the visible light region is a pigment that absorbs light in the ultraviolet region or visible light region and emits fluorescence or phosphorescence in a wavelength region of 400 to 470 nm or 570 to 700 nm. 3. The light reflector according to 3.
The phosphor that emits light in the visible light region is a dye that absorbs light in the ultraviolet region or visible light region and emits fluorescence or phosphorescence in a wavelength region of 400 to 470 nm or 570 to 700 nm. 3. The light reflector according to 3.
In the reflection spectrum of the light reflector, the maximum light reflectance in the wavelength region of 400 ~ 470 nm, the difference between the minimum light reflectance in the wavelength region of 470 ~ 570 nm and delta 1, the maximum light reflectance in the wavelength region of 570 ~ 700 nm 5. One or both of Δ 1 and Δ 2 are 1% or more, where Δ 2 is a difference between the ratio and the minimum light reflectance in the wavelength region of 470 to 570 nm. The light reflector described.
In the reflection spectrum of the light reflector, one or both of the maximum light reflectance in the wavelength region of 400 to 470 nm and the maximum light reflectance in the wavelength region of 570 to 700 nm exceed 100%. The light reflector according to claim 4.
The light reflecting layer according to claim 3, wherein the light emitting layer contains 100 parts by weight of a synthetic resin, 0.05 to 50 parts by weight of a light reflective filler, and a light emitting body that emits light in a visible light region. body.
The wavelength region of the reflected light reflected at the interface between the synthetic resin constituting the light emitter layer and the light reflective filler is a light absorption wavelength region or a light emission wavelength region in the light emitter contained in the light emitter layer. The light reflector according to claim 9, wherein the light reflector overlaps.
The light reflector according to claim 9, wherein a difference between a refractive index of the synthetic resin constituting the light emitting layer and a refractive index of the light reflective filler is 0.05 or more.
10. The light reflector according to claim 9, wherein the light emitter layer contains 0.05 to 25 parts by weight of a light reflective filler with respect to 100 parts by weight of the synthetic resin.
The light reflector according to claim 9, wherein the light reflective filler is a white pigment.
The light reflector according to claim 9, wherein, in the reflection spectrum of the light reflector, the maximum light reflectance in a wavelength region of 360 to 740 nm is 100% or more.
4. The light reflector according to claim 3, wherein the light reflector has a surface layer laminated and integrated on the light emitter layer and containing a synthetic resin and a light reflective filler.
The wavelength region of the reflected light reflected at the interface between the synthetic resin constituting the surface layer and the light reflective filler contained in the surface layer is light in the light emitter contained in the light emitter layer. The light reflector according to claim 15, wherein the light reflector overlaps with an absorption wavelength region or an emission wavelength region.
The light reflector according to claim 15, wherein in the reflection spectrum of the light reflector, the maximum light reflectance in a wavelength region of 360 to 740 nm is 100% or more.
In the reflection spectrum of the light reflector, the maximum light reflectance in the wavelength region of 360 to 740 nm is 100 hours in an accelerated exposure test conducted under conditions of a temperature of 50 ° C. and a relative humidity of 20% in accordance with JIS K7350-4. The light reflector according to claim 15, which is 100% or more later.
The difference between the refractive index of the synthetic resin constituting the surface layer and the refractive index of the light reflective filler contained in the surface layer is 0.05 or more. Light reflector.
The light reflector according to claim 15, wherein the surface layer contains 0.05 to 50 parts by weight of a light reflective filler with respect to 100 parts by weight of the synthetic resin.
The light reflector according to claim 15, wherein the average light transmittance in the wavelength region of 360 to 740 nm in the surface layer is 70% or less.
4. The light reflector according to claim 3, wherein the light reflection layer is formed of a foam.
4. The light reflector according to claim 3, wherein a part of the light reflection layer is formed of a foam.
The light reflector according to claim 3, wherein a foam layer is laminated and integrated on the other surface of the light reflective layer.
The light reflector according to claim 4, wherein the light reflector is used for plant cultivation.
An illumination device comprising: a light source; and the light reflector according to claim 3.
27. The illumination device according to claim 26, wherein the light source is a fluorescent lamp.
27. The lighting device according to claim 26, wherein the lighting device is used to illuminate an article placed on a merchandise display shelf.
An illumination device for plant cultivation comprising a light source and the light reflector according to claim 4.
An illumination device for plant cultivation comprising a light source, the light reflector according to claim 4, and a plant cultivation shelf arranged in front of the light source.
The light reflector is disposed between the first light reflector disposed behind the light source in a curved shape, and the curved end portion of the first light reflector and the plant cultivation shelf. The lighting device for plant cultivation according to claim 30, comprising a second light reflector.