JP2011124189A - Lighting device and light-emitting color change method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of changing color of illumination light at low cost without replacing a light source itself of an LED lighting device. <P>SOLUTION: The lighting device has a light source unit including a circuit board, and a plurality of light-emitting diodes arranged on the surface of the circuit board, a housing member for housing the light source unit, and a phosphor containing sheet containing a phosphor in order to emit wavelength-converted light by converting the light-emitted light from the plurality of light-emitting diodes supported with the housing member. The phosphor containing sheet is a sheet detachably arranged so as to cover the plurality of light-emitting diodes. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lighting device using a light emitting diode device.

  In recent years, LED lighting devices using light emitting diode (LED) devices as light sources are becoming widespread as lighting devices instead of light sources such as incandescent bulbs and fluorescent lamps. The LED is a PN junction semiconductor, and when a forward voltage is applied, electrons from the N region and holes from the P region move to the PN junction portion and emit light when the electrons and holes recombine. Such a semiconductor light emitting device emits only monochromatic light in a narrow wavelength range because energy emitted when free electrons recombine is emitted as light.

  As an LED lighting device, for example, a daylight color suitable for illumination by mixing light of different colors such as blue light emitted from a blue LED element, red light emitted from a red LED element, green light emitted from a green LED element, 2. Description of the Related Art Lighting devices such as LED bulbs that emit daylight white, white, warm white, or bulb colors are known. As another method, as shown in Patent Document 1 below, a wavelength conversion plane containing phosphors attached at a predetermined distance to emit light from a light source unit that uses light emitted from an LED element as a light source. There is also known an LED illumination device that emits white light by using and converting the wavelength.

  These LED illuminating devices have a very long life compared to conventional incandescent bulbs and illuminating devices using fluorescent tubes, for example, several tens of times longer than incandescent bulbs and several times longer than fluorescent tubes. . Therefore, the greatest advantage of LED illumination is that it does not need to be frequently replaced like conventional incandescent bulbs and fluorescent tubes. On the other hand, since the LED lighting device is not sufficiently widespread at the present time as compared with the conventional lighting device, there is a disadvantage that its price is extremely high.

Japanese Patent Laid-Open No. 2006-244779

  Conventionally known LED illumination devices using LED bulbs or the like can emit only one specific type of illumination light. For this reason, when an LED illumination device that emits a specific emission color is installed in a room of a house or store, an LED illumination device that emits light of a different color when it is desired to change the illumination atmosphere over time It was necessary to replace it. However, as described above, since the LED lighting device has a long life, there are few opportunities for replacement due to wear such as incandescent light bulbs and fluorescent tubes. There was a problem of being big. In particular, when renovating a store or the like within a limited budget, replacing the LED lighting device with a new one is extremely costly.

  In order to solve the above-described problems, an object of the present invention is to provide an illumination device that can change the color of illumination light at a low cost without replacing the light source itself of the LED illumination device.

  An illumination device according to an aspect of the present invention includes a light source unit including a circuit board and a plurality of light emitting diodes disposed on the surface of the circuit board, a housing member that houses the light source unit, and a plurality of members disposed on the housing member. A phosphor-containing sheet containing a phosphor for converting the wavelength of light emitted from the light-emitting diode and emitting the wavelength-converted light to the outside, and the phosphor-containing sheet covers a plurality of light-emitting diodes Further, the sheet is detachably disposed. According to such an illuminating device, the color of illumination light can be changed only by replacing the phosphor-containing sheet without replacing the light source using an expensive LED.

  The phosphor-containing sheet is preferably a sheet in which a phosphor-containing member containing a phosphor is supported by a support base material. Specifically, the phosphor-containing member can be laminated on the entire surface of the translucent support base material, or the phosphor-containing member can be scattered and supported only in a region facing the light emitting diode on the support base material. According to such a configuration, it is possible to support a thin phosphor-containing member or a phosphor-containing member formed discontinuously, and the desorption property is also improved by imparting rigidity.

  Moreover, it is preferable to further provide a light diffusion prevention cylinder surrounding each light emitting diode between the circuit board surface and the phosphor-containing sheet. According to such a configuration, diffused light can be guided to the phosphor-containing sheet. Such a light diffusion prevention cylinder may be supported on the surface of the translucent support base material or may be supported on the surface of the circuit board.

  Further, the phosphor-containing member is located on the side facing the plurality of light emitting diodes, the translucent support base is located on the light output side of the lighting device, and the surface roughness of the outer surface of the translucent support base is arithmetic. The average roughness (Ra) is preferably in the range of 0.1 to 8 μm. According to such a structure, since the surface area of the outer surface of a support base material becomes large, the light emission efficiency of an illuminating device can be improved.

  Moreover, it is preferable that a translucent support base material has a lens structure on the outer surface. According to such a structure, the emitted light from an illuminating device can be diffused.

  In addition, the phosphor-containing member is located on the side facing the plurality of light emitting diodes, the translucent support base is located on the light output side of the plurality of light emitting diodes, and absorbs ultraviolet rays on the outer surface of the translucent support base. It is preferable that a layer is further formed. According to such a configuration, even when a light emitting diode that emits ultraviolet light is used, leakage of ultraviolet light to the outside can be suppressed.

  Moreover, it is preferable that the supporting base material is a frame body having an open window in a region facing the plurality of light emitting diodes, and the phosphor-containing member is supported by the frame body so as to be arranged in the open window region. According to such a configuration, the amount of expensive phosphor used can be reduced, and light absorption by the support substrate does not occur. In addition, by forming a reflective film on the surface of the frame, it is possible to suppress a decrease in light extraction efficiency due to light diffusion.

  The phosphor-containing member preferably has a lens structure. According to such a structure, the emitted light from an illuminating device can be diffused.

  It is preferable that the phosphor-containing member contains a silicone resin as a resin base material. Since the silicone resin is excellent in light transmittance, higher light extraction efficiency can be obtained.

  Moreover, it is preferable that at least one of the phosphor-containing member or the translucent support substrate contains a light diffusing agent.

  In addition, a method for changing light emission colors of a plurality of lighting devices according to another aspect of the present invention includes a light source unit including a light emitting diode and a phosphor for converting the wavelength of light emitted from the light emitting diode by covering the plurality of light emitting diodes. The phosphor-containing cover is detachably supported on the light-emitting surface of the lighting device, and the emission wavelength of the lighting device is changed by replacing only the phosphor-containing cover. It is characterized by changing.

  According to the present invention, the color of illumination light can be changed at low cost without replacing the light source itself using an expensive LED.

FIG. 1 is a schematic perspective view for explaining an LED illumination device 10 of the present embodiment. FIG. 2 is a schematic cross-sectional view taken along the line AA ′ of the LED lighting device 10 of FIG. FIG. 3 is an explanatory diagram for explaining the attachment / detachment of the phosphor-containing sheet 2 in the LED lighting device 10 of FIG. 1. FIG. 4 is a schematic diagram for explaining an example of a support means for the phosphor-containing sheet 2 in the LED lighting device 20 of the present embodiment. FIG. 5 is a schematic diagram for explaining another example of the support means for the phosphor-containing sheet 2 in the LED lighting device 30 of the present embodiment. FIG. 6 is a schematic perspective view for explaining a configuration example of the phosphor-containing sheet 22 of the present embodiment. FIG. 7 is a schematic perspective view for explaining another configuration example of the phosphor-containing sheet 25 of the present embodiment. FIG. 8 is a schematic perspective view for explaining another configuration example of the phosphor-containing sheet 32 of the present embodiment. FIG. 9 is a schematic cross-sectional view for explaining the LED lighting device 40 provided with the phosphor-containing sheet 32 shown in FIG. FIG. 10 is a schematic perspective view for explaining another configuration example of the phosphor-containing sheet of the present embodiment. FIG. 11 is a schematic perspective view for explaining another configuration example of the phosphor-containing sheet of the present embodiment. FIG. 12 is a schematic cross-sectional view for explaining the LED lighting device 50 provided with the phosphor-containing sheet 52 shown in FIG. FIG. 13 is an explanatory diagram for explaining the LED lighting device 60 using the phosphor-containing sheet 62 in which the reflective film 65 is formed on the surface of the support base 24 of the phosphor-containing sheet 32 shown in FIG. FIG. 14 is an explanatory diagram for explaining an LED illumination device 70 in which a light diffusion prevention cylinder 45 is disposed between a phosphor-containing sheet and a circuit board. FIG. 15 is an explanatory diagram of a phosphor-containing sheet 52 using a frame body having an open window 30 as a support substrate, in which convex portions 44 that function as lenses are formed on the surface of the phosphor-containing member 53. FIG. 16 is a schematic cross-sectional view for explaining the LED lighting device 51 in which the phosphor-containing sheet 52 is disposed. FIG. 17 is a schematic cross-sectional view for explaining an LED lighting device 41 in which a phosphor-containing sheet 42 in which a lens 54 is provided on a support base 24 is disposed.

[First Embodiment]
First, the entire structure of the LED lighting device according to the first embodiment of the lighting device of the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a perspective view for explaining the LED illumination device 10 of the first embodiment, and FIG. 2 is a cross-sectional view of the LED illumination device 10 of FIG. In the figure, 1 is an LED device (light emitting diode), 2 is a phosphor-containing sheet (phosphor-containing cover), 3 is a circuit board, 3a is an electric circuit formed on the surface of the circuit board 3, 4 is a housing member, 5 is a plug for supplying electric power to the circuit board 3, and 6 is a slide groove for supporting the phosphor-containing sheet 2. In FIG. 1, in order to explain the internal structure of the LED lighting device 10, a part of the phosphor-containing sheet 2 is represented through.

  In the LED lighting device 10, a light source unit is configured by mounting a plurality of LED devices 1 on two straight lines on an electric circuit 3 a formed on the surface of the circuit board 3. In addition, the number and arrangement | positioning of the LED apparatus 1 are not restricted to such a form, It can adjust freely according to a use and the objective. Then, the LED device 1 is turned on by inserting the plug 5 into an unillustrated outlet and supplying power to the circuit board 3. Moreover, you may provide the control circuit for controlling lighting of the LED apparatus 1, an optical sensor, an electronic timer, etc. on the circuit board 3 as needed. Such a light source unit is accommodated in the housing member 4. The housing member 4 has an opening or a light transmission surface on the light emitting surface side of the LED device 1.

  The phosphor-containing sheet 2 is supported by a slide groove 6 provided in the housing member 4 at a predetermined distance from the plurality of LED devices 1. One phosphor-containing sheet 2 covers a plurality of LED devices 1.

  In the LED lighting device 10, the LED device 1 emits light by supplying power from the plug 5 to the circuit board 3. The emission color of the LED device 1 depends on the emission wavelength of the LED chip that is the light source of the LED device 1. Light emitted from the LED device 1 is incident on the phosphor-containing sheet 2. The light incident on the phosphor-containing sheet 2 is wavelength-converted by the phosphor contained in the phosphor-containing sheet 2 to a wavelength determined according to the phosphor composition, and a wavelength different from the emission wavelength of the LED chip itself. Emits the light.

  As the LED device 1, an LED having an element that emits light in a wavelength region such as visible light, near-infrared light, infrared light, or the like that has been known in the past. The apparatus is used without any particular limitation. Among these, ultraviolet light, near ultraviolet light, blue to green wavelength, specifically blue LED device or green LED device having a peak in the range of 360 to 570 nm, and white LED device including these emission wavelengths Is preferable because a wide range of color expression is possible. Examples of blue LED devices include GaN-based, SiC-based; ZnS-based, ZnSe-based, and the like. Moreover, as a green LED apparatus, GaP type; N type; GaP type etc. are mentioned. These may be used alone or in combination of two or more.

  Further, as the circuit substrate 3, an inorganic substrate such as an aluminum substrate such as a ceramic substrate or an aluminum nitride substrate; a resin substrate such as an epoxy resin substrate, a polyamide resin substrate, an aromatic resin substrate, or a silicone resin substrate, etc. Used without limitation.

  The number and output of the LED devices 1 mounted on the circuit board 3 can be freely selected according to the required illuminance or the like.

  In the LED lighting device 10, the phosphor-containing sheet 2 is detachably supported by a slide groove 6 provided in the housing member 4. By supporting the phosphor-containing sheet 2 by the slide groove 6 in this manner, removal and attachment are facilitated. Specifically, as shown in FIG. 3, the phosphor-containing sheet 2 can be easily removed by sliding in the direction of arrow B along the slide groove 6, and the phosphor-containing sheet 2 is moved along the slide groove 6. Can be easily attached by sliding in the direction of arrow C. Then, by replacing the phosphor-containing sheet 2 attached in advance with a phosphor-containing sheet having a different phosphor composition, the colored light of the LED lighting device 10 can be changed easily and at low cost. Specifically, for example, when a blue LED that emits blue light having a wavelength of 450 to 470 nm is used as the LED device 1 and a phosphor-containing sheet containing a YAG phosphor is used, white light is obtained. In addition, when a white LED having a light emitting element such as blue is used as the LED device 1 and a phosphor-containing sheet containing a yellow, orange, or red phosphor is used, the light bulb color or the like is more white than the original white. A low color temperature is obtained. Therefore, by appropriately using phosphor-containing sheets having different phosphor blending compositions, the emission color can be easily changed without replacing the LED device 1 itself of the LED lighting device. Therefore, for example, when the LED lighting device 10 is installed, when it is desired to change the illumination atmosphere over time, or when a store or the like changes the illumination color according to the season, the target emission color is set. It is only necessary to replace it with a phosphor-containing sheet that emits light. According to such an LED lighting device 10, the emission color of the LED lighting device can be changed at low cost.

  Next, another example of the means for supporting the phosphor-containing sheet 2 will be described with reference to FIGS.

  FIG. 4 is a schematic diagram of the LED lighting device 20 that is detachably supported by fitting and fixing the phosphor-containing sheet 2 in a gap between a frame 16a and a fixing claw 16b provided in a step shape on the housing member 14. It is sectional drawing. In the LED lighting device 20, the phosphor-containing sheet 2 is bent to release the fixed state by the frame 16a and the fixing claws 16b, the original phosphor-containing sheet 2 is removed, and the phosphor that performs wavelength conversion to another emission color The colored light of the LED lighting device 20 can be easily changed by replacing with the containing sheet and re-fixing.

  FIG. 5 also shows that the phosphor-containing sheet 2 is detachably supported by the engaging claw 17 provided at the end of the phosphor-containing sheet 2 in the engaging portion provided in the housing member 18. It is a schematic cross section of the LED lighting device 30. In the LED lighting device 30, the phosphor-containing sheet 2 is detachable from the housing member 18 by locking the locking claw 17 provided at the end of the phosphor-containing sheet 2 to the engaging portion provided in the housing member 18. It is supported. Then, the locked state is released, the phosphor-containing sheet 2 is removed, and the phosphor-containing sheet that performs wavelength conversion to another emission color is replaced and engaged, so that the colored light of the LED lighting device 30 can be easily obtained. Can be changed. Moreover, an engaging part may be provided in the edge part of the fluorescent substance containing sheet 2, and the latching claw provided in the housing member 18 may be latched to an engaging part.

  Next, a typical configuration of the phosphor-containing sheet 2 described above will be described in detail.

  The form is not specifically limited if the fluorescent substance containing sheet 2 is one resin sheet containing the fluorescent substance which covers the some LED apparatus 1. FIG. The phosphor-containing sheet 2 may be a single-layer sheet containing a phosphor having a predetermined blending composition, or a laminate in which a plurality of layers having different phosphor types and blending compositions are laminated. Furthermore, a laminate in which a layer containing a phosphor and a layer not containing a phosphor are laminated may be used. Further, the phosphor blended in the phosphor-containing sheet 2 has a region in which the phosphor is partially unevenly distributed or the phosphor does not exist even if the phosphor is uniformly dispersed on the entire surface of the sheet. May be. Below, the preferable form of the fluorescent substance containing sheet 2 is demonstrated.

  FIG. 6 is a schematic perspective view of a phosphor-containing sheet 22 formed by laminating a phosphor-containing layer 23 and a support base 24 that supports the phosphor-containing layer 23 as an embodiment of the phosphor-containing sheet 2.

  The support base 24 is a layer that supports the phosphor-containing layer 23 to be laminated in order to improve the desorption property by imparting rigidity to the phosphor-containing sheet 22. As the support base material 24, a base material made of a material that transmits light emitted from the LED device 1 or light emitted by being converted by the phosphor-containing layer 23 is preferably used. Examples of the material constituting the support base 24 include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polycarbonate, polyarylate, acrylic resin, and epoxy resin. , A light transmissive resin material such as a silicone resin, or a light transmissive inorganic material such as glass or a silicone substrate is used.

  The phosphor-containing layer 23 is a layer obtained by dispersing a phosphor in various resin materials that are excellent in translucency and light resistance to light emitted from the LED device 1.

  Specific examples of the resin material used for the phosphor-containing layer 23 include, for example, acrylic resins, polycarbonate resins, epoxy resins, silicone resins such as silicone elastomers, polyolefin resins, polyester resins, polyurethane elastomers, and the like. Of these, silicone elastomers are preferred because they are excellent in light resistance and light transmission, so that there is little deterioration such as discoloration due to long-time use, and phosphors can be easily dispersed uniformly.

  Next, the phosphor contained in the phosphor-containing layer 23 will be described.

The phosphor contained in the phosphor-containing layer 23 is not particularly limited. Specific examples thereof include, for example, Y _{3 -X} Gd _X Al ₅ O ₁₂ : Ce (0 ≦ x ≦ 3) yttrium aluminate-based fluorescent material (YAG), Ca-α-SiAlON: Eu, and the like. yellow phosphor; CaS: Eu, CaAlSiN _3: red phosphor such as Eu; formula _{AEu (1-x) Ln x} B 2 O 8 (a is selected Li, K, Na, and from the group consisting of Ag Ln is one selected from the group consisting of Y, La, and Gd, and B is W or Mo.) A red phosphor represented by β-SiAlON: Eu Examples thereof include phosphors. These may be used alone or in combination of two or more.

  The blending composition is appropriately changed according to the target luminescent color (for example, daylight color, day white, white, warm white, or light bulb color).

  For example, by combining a phosphor-containing sheet containing a green phosphor and a red phosphor with a white LED obtained by converting the wavelength of light emitted from a GaN-based blue light emitting element with a YAG phosphor as the LED device 1. Thus, it is possible to obtain a warm white light source or a light bulb color light source with improved color rendering index (Ra).

  In addition, a blue LED is used as a light source and is combined with a phosphor-containing sheet containing a green phosphor, a yellow phosphor, a red phosphor, or the like, or contains a predetermined amount of a green phosphor, a yellow phosphor, or the like. Illumination light of a desired color can also be obtained by stacking the phosphor-containing sheet and a phosphor-containing sheet containing a predetermined amount of red phosphor. Furthermore, the LED device 1 that emits ultraviolet rays or near ultraviolet rays is used as a light source, and combined with a phosphor-containing sheet including a blue phosphor, a green phosphor, a red phosphor, a YAG phosphor, a blue phosphor, a green phosphor, It is also possible to stack a plurality of independent phosphor-containing sheets including a red phosphor, a YAG phosphor and the like. In this way, illumination light of a color along a black body radiation locus suitable for general lighting, or an intermediate color other than the vicinity of the black body radiation locus for a store to produce a seasonal feeling due to illumination, for example, dew grass under a common name Illumination light tailored to the sensibility of designers and users can be obtained, such as colors, bamboo colors, moe, Yamabuki, deciduous leaf, and red plum.

  Although the content rate of the fluorescent substance contained in the fluorescent substance content layer 23 is not specifically limited, When using a white LED light source, it is the range of 5-60 mass%, Furthermore, it is the range of 20-50 mass%. preferable.

  Moreover, you may mix | blend an inorganic particle in the fluorescent substance content layer 23 in order to scatter the light emitted from the LED device 1, or to color it further. Examples of such inorganic particles include silica, titanium oxide, aluminum oxide, calcium carbonate, talc, glass powder, and pigments such as cobalt blue, ultramarine blue, and iron oxide. These may be used alone or in combination of two or more.

  Such a phosphor-containing layer 23 is obtained by kneading a phosphor and a resin component using a roll, a Banbury mixer, an extruder, etc., and then extruding with a T-die, or forming into a sheet by pressing or calendaring. It is done.

  The thickness of the phosphor-containing layer 23 is preferably about 10 to 3000 μm, more preferably about 50 to 500 μm. When the thickness of the phosphor-containing layer 23 is in the above range, it can be molded with high dimensional accuracy.

  The phosphor-containing layer 23 is laminated on the surface of the support base 24 described above. In the lamination, for example, the phosphor-containing layer 23 is extruded from a T-die and bonded to the support base 24 in a softened state, or a liquid resin for forming the phosphor-containing layer 23 is applied on the support base 24. Thereafter, it is obtained by a method of curing or solidifying, or bonding a phosphor-containing layer 23 and a support base 24 prepared in advance with an adhesive excellent in light transmittance.

  The thickness of the support base 24 is preferably about 10 to 3000 μm, and more preferably about 50 to 500 μm. When the support base 24 is too thick, the light transmittance tends to decrease and the illuminance tends to decrease. When the support base 24 is too thin, the phosphor-containing sheet 22 has insufficient rigidity, and the phosphor-containing sheet 22. There is a tendency that the handling property at the time of desorbing is reduced.

  Moreover, it is preferable that the outer surface of the support base material 24 has a rough surface whose surface roughness is in the range of arithmetic average roughness (Ra) 0.1 to 8 μm. When the support base material 24 having such a rough surface is used, when the phosphor-containing layer 23 faces the LED device 1 and the support base material 24 faces the light output side of the illumination device, the support base material 24 is supported. Since the surface area of the outer surface of the base material 24 is increased, the light output efficiency can be increased. Further, when the support base 24 having such a rough surface is used, when the support base 24 faces the LED device 1 and the phosphor-containing layer 23 faces the light output side of the lighting device, Since the surface area of the outer surface of the support base 24 is increased, the light incident efficiency of light emission of the LED device 1 can be increased. Moreover, you may provide such a rough surface structure on both the surface of the light emission side of an illuminating device, and the both sides of the side facing the LED device 1.

  The total thickness of the phosphor-containing sheet 22 is preferably 20 to 6000 μm, and more preferably 100 to 1000 μm. If the total thickness of the phosphor-containing sheet 22 is too thin, the rigidity of the sheet is low, so that the detachability of the phosphor-containing sheet 22 tends to decrease, and if it is too thick, the light transmittance tends to decrease. There is.

  Such a phosphor-containing sheet 22 is preferably used as the phosphor-containing sheet 2 that is detachably disposed on the LED lighting device 10.

  FIG. 7 is a perspective schematic view of a phosphor-containing sheet 25 obtained by further laminating an ultraviolet absorbing layer 26 on the outer surface side of the support base 24 of the phosphor-containing sheet 25 as another form of the phosphor-containing sheet 2. The figure is shown. In the phosphor-containing sheet 25, by providing the ultraviolet absorption layer 26, when the LED device 1 emits ultraviolet light, leakage of ultraviolet light to the outside can be suppressed. When the LED device 1 that emits ultraviolet light is used, it is difficult for the phosphor to absorb all the ultraviolet light. Therefore, it is preferable to provide an ultraviolet absorbing layer 26 containing an ultraviolet absorber on the outer surface side of the support base 24. As the ultraviolet absorber, 2- (2-hydroxy-3.5-di-t-butylphenyl) -5-chlorobenzotriazole or the like can be used. By providing the ultraviolet absorption layer 26 in this manner, leakage of ultraviolet rays from the LED lighting device 10 can be suppressed. The ultraviolet absorbing layer 26 can be manufactured by the same method except that an ultraviolet absorber is blended in place of the phosphor in the phosphor-containing layer 23 described above.

  FIG. 8 is a schematic perspective view of a phosphor-containing sheet 32 which is another form of the phosphor-containing sheet 2. The phosphor-containing sheet 32 has the same configuration as that of the phosphor-containing sheet 22 described above except that the phosphor-containing layer 33 is provided in a portion facing a region where the plurality of LED devices 1 accommodated in the LED lighting device 10 are arranged. It is the same composition. FIG. 9 shows a schematic cross-sectional view of the LED lighting device 40 using the phosphor-containing sheet 32 as the phosphor-containing sheet 2. By adopting such a configuration, it is possible to reduce problems with respect to displacement of the mounting position of the LED device and displacement of the phosphor-containing sheet while reducing the amount of phosphor used.

  As shown in FIG. 9, the phosphor-containing sheet 32 is provided with a phosphor-containing layer 33 in a region facing the row in which the plurality of LED devices 1 are arranged. Since the light emitted from the LED device 1 has an extremely high directivity, even if the phosphor is unevenly distributed in the plane like the phosphor-containing sheet 32, the wavelength conversion is sufficiently performed. In order to reduce the manufacturing cost of manufacturing the LED lighting device, it is required to suppress the usage amount of the phosphor, which is an expensive material. By using such a phosphor-containing sheet 32, The amount used can be reduced. In such a case, diffused light can be effectively used by providing an antireflection layer described later in a portion where the phosphor-containing sheet 32 does not exist.

  Furthermore, as shown in FIG. 10, as another form of the phosphor-containing sheet 2, the phosphor-containing layer 43 is dotted on the portion of the support base 24 that faces the area where the plurality of LED devices 1 are arranged. The phosphor-containing sheet 42 thus laminated may be used. By using such a phosphor-containing sheet 42, the usage amount of the phosphor can be further greatly reduced.

  Further, as another form of the phosphor-containing sheet 2, in FIG. 11, a support base material 34 that is a frame having an open window 30 in a region facing the plurality of LED devices 1, and the open window 30 contains a phosphor. The perspective schematic diagram of the fluorescent substance containing sheet | seat 52 formed by arrange | positioning the member 53 is shown. FIG. 12 is a schematic cross-sectional view of an LED lighting device 50 using the phosphor-containing sheet 52 as a phosphor-containing sheet. As shown in FIGS. 11 and 12, the support base material 34 is a frame body having an open window 30, and the phosphor-containing member 53, which is a resin material containing a phosphor, is supported by the frame body to the open window 30. Has been placed. According to such a form, the phosphor-containing member 53 does not have a structure in which the phosphor-containing member 53 is laminated on the support substrate 24 like the phosphor-containing sheets 22, 25, 32, or 42 described above. Therefore, since the light absorption by a support base material does not arise, higher illuminance can be secured. As the phosphor-containing member 53, a resin sheet similar to the phosphor-containing layer described above is used. The method for fixing the phosphor-containing member 53 to the support base material 34 having the open window 30 is not particularly limited. For example, a method for fixing the phosphor-containing member 53 to the support base material 34 by adhesion or the like, or an open window For example, a method of fitting the phosphor-containing member 53 to 30 can be used.

  In the phosphor-containing sheets 32, 42, and 52 described above, the phosphor-containing layers 33 and 43 or the phosphor-containing member 53 are light emitting portions, respectively. In this case, in order to obtain higher illuminance, it is preferable to provide a reflective layer in a region other than the light emitting portion.

  FIG. 13 shows, as an example, an LED using a phosphor-containing sheet 62 in which a reflection layer 65 is provided in a region where the phosphor-containing layer 33 is not formed on the inner surface of the support base 24 of the phosphor-containing sheet 32. 3 is a schematic cross-sectional view of the lighting device 60. FIG.

  Since the light emitted from the LED device 1 has extremely high directivity, the phosphor-containing layer 33 is provided only in the facing region, so that most of the light emitted from the LED device 1 is incident on the phosphor-containing layer 33. However, due to the influence of the distance between the LED device and the phosphor-containing sheet, the distance between the plurality of LED devices, the internal structure of the housing member 4, etc., some light becomes diffuse light and effectively used as illumination light It may not be done. In order to further improve the illumination efficiency, it is important to use such light. In this case, as shown by the arrow L in the LED lighting device 60 of FIG. 13, by providing the reflective layer 65 in a region where the phosphor-containing layer 33 is not formed, the diffused light is diffused. It can lead to 33 and can be used effectively. At this time, if the reflective layer is provided also on the circuit board 3 and the housing member 4, light can be used more effectively.

  Such a reflective layer 65 is obtained by forming a thin film having a high reflectivity by a conventionally known method of selectively forming a thin film in a region where the phosphor-containing layer is not formed on the surface of the support substrate. It is done. Specifically, the portion where the phosphor-containing layer is formed on the surface of the support substrate is masked, and the other regions are reflected by a conventionally known method such as vapor deposition, sputtering, coating, or plating. A metal film having a high rate can be formed.

  Further, as a method for guiding such diffused light to the phosphor-containing layer 33 and effectively using it, as shown in FIG. 14, between the surface of the circuit board 3 and the phosphor-containing sheet 32, the phosphor-containing layer. A light diffusion prevention cylinder 45 that accommodates the LED 33 and the LED device 1 may be provided. In this case, as indicated by an arrow R in the LED illumination device 70 of FIG. 14, the light emitted from the LED device 1 can be efficiently guided to the phosphor-containing layer 33 by reflection on the wall surface of the light diffusion prevention cylinder 45. it can. Such a light diffusion preventing cylinder 45 is formed of a resin cylinder or the like in which a thin film having a high reflectance is formed on the inner surface thereof. Such a light diffusion prevention cylinder 45 may be supported on the circuit board 3, may be supported on the surface of the support base, or may be supported on both the circuit board 3 and the support base.

  Furthermore, you may provide a lens structure in the area | region in which the fluorescent substance containing layer or fluorescent substance containing member of the fluorescent substance containing sheet is formed. By providing such a lens structure, illumination light can be diffused. Since the light emitted from the LED device 1 has high directivity, the light emitted from the LED lighting device inevitably has high directivity. In such a case, by providing the lens structure, the directivity is relaxed and the diffusibility is increased, so that light can be irradiated over a wide range.

  Specifically, for example, as shown in the schematic perspective view of FIG. 15, in a phosphor-containing sheet 52 using a frame having an open window 30 as a support base, it acts as a lens on the surface of the phosphor-containing member 53. The convex part 44 to be formed can be formed. When such a lens structure is provided, as shown by an arrow N in FIG. 16, light having high directivity from the LED device 1 can be changed to illumination light having high diffusibility.

  Such a lens structure may be provided on the surface of the phosphor-containing member 53 as shown in FIGS. 15 and 16, or may be provided with a convex portion 54 on the surface of the support base as shown in FIG. .

  The LED lighting device described above can be preferably used as a light source for various displays in addition to a lighting device such as indoor lighting.

DESCRIPTION OF SYMBOLS 1 LED device 2,22,25,32,42,52,62 Phosphor containing sheet | seat 3 Circuit board 3a Electric circuit 4,14,18 Housing member 5 Plug 6 Slide groove 10,20,30,40,50,60, 70 LED illumination device 16a Frame 16b Fixing claw 17 Locking claw 24, 34 Support base material 23, 33, 43 Phosphor-containing layer 24 Housing member 26 Ultraviolet absorption layer 30 Open window 44, 54 Convex part (lens)
45 Light diffusion prevention cylinder 53 Phosphor-containing member 65 Reflective layer

Claims (18)

A light source unit comprising a circuit board and a plurality of light emitting diodes disposed on the surface of the circuit board; a housing member that houses the light source unit; and light emission from the plurality of light emitting diodes supported by the housing member. A phosphor-containing sheet containing a phosphor for converting and converting the wavelength-converted light to the outside,
The phosphor-containing sheet is a sheet that is detachably disposed so as to cover the plurality of light emitting diodes.   The lighting device according to claim 1, wherein the phosphor-containing sheet is a sheet in which a phosphor-containing member containing a phosphor is supported by a support base material.   The lighting device according to claim 2, wherein the support base material is a translucent support base material, and the phosphor-containing member is laminated on the translucent support base material.   The lighting device according to claim 3, wherein the phosphor-containing member is a sheet having a region in which phosphors are unevenly distributed in a region facing the plurality of light emitting diodes.   The lighting device according to claim 4, further comprising a light diffusion prevention cylinder that surrounds each of the light emitting diodes between the surface of the circuit board and the phosphor-containing sheet.   The lighting device according to claim 5, wherein the light diffusion preventing cylinder is disposed on a surface of the translucent support base material. The phosphor-containing member is located on the side facing the plurality of light emitting diodes, and the translucent support base is located on the light output side of the illumination device;
The illumination device according to any one of claims 4 to 6, wherein the surface roughness of the outer surface of the translucent support base material is in the range of arithmetic average roughness (Ra) of 0.1 to 8 µm.   The lighting device according to claim 7, wherein the translucent support substrate has a lens structure on the outer surface. The phosphor-containing member is positioned on a side facing the plurality of light emitting diodes, and the translucent support base is positioned on a light output side of the plurality of light emitting diodes;
The lighting device according to any one of claims 4 to 8, wherein an ultraviolet absorbing layer is further formed on an outer surface of the translucent support base material.   The support substrate is a frame having an open window in a region facing the plurality of light emitting diodes, and the phosphor-containing member is supported by the frame so as to be disposed in the region of the open window. Item 3. The lighting device according to Item 2.   The lighting device according to claim 10, further comprising a light diffusion prevention cylinder that surrounds each of the light emitting diodes between the circuit board surface and the phosphor-containing sheet.   The lighting device according to claim 11, wherein the light diffusion prevention cylinder is disposed on the frame.   The lighting device according to claim 10, wherein the phosphor-containing member has a surface having a lens structure.   The lighting device according to claim 8, wherein a reflective film is formed on a surface of the frame body.   The lighting device according to any one of claims 2 to 14, wherein the phosphor-containing member contains a silicone-based resin as a resin base material.   The lighting device according to any one of claims 2 to 15, wherein at least one of the phosphor-containing member and the translucent support base contains a light diffusing agent. Using a light source unit composed of a plurality of light emitting diodes, and a lighting device including a phosphor-containing cover containing a phosphor for converting the wavelength of light emitted from the light emitting diodes by covering the plurality of light emitting diodes,
The phosphor-containing cover is detachably supported on the light emitting surface of the lighting device,
A method for changing a light emission color of an illuminating device, wherein the light emitting wavelength of the illuminating device is changed by replacing only the phosphor-containing cover.   The phosphor-containing cover contains a phosphor for wavelength-converting light emitted from the plurality of light-emitting diodes supported by a housing member that accommodates the light source unit and emitting the wavelength-converted light to the outside. The method according to claim 17, wherein the luminescent color is changed.

Images