WO2012063759A1 - Led lighting device - Google Patents

Led lighting device Download PDF

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Publication number
WO2012063759A1
WO2012063759A1 PCT/JP2011/075549 JP2011075549W WO2012063759A1 WO 2012063759 A1 WO2012063759 A1 WO 2012063759A1 JP 2011075549 W JP2011075549 W JP 2011075549W WO 2012063759 A1 WO2012063759 A1 WO 2012063759A1
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WO
WIPO (PCT)
Prior art keywords
prism
led
light source
protective cover
light
Prior art date
Application number
PCT/JP2011/075549
Other languages
French (fr)
Japanese (ja)
Inventor
育夫 三村
Original Assignee
日本カーバイド工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2010-251293 priority Critical
Priority to JP2010251293 priority
Priority to JP2010251316 priority
Priority to JP2010-251316 priority
Application filed by 日本カーバイド工業株式会社 filed Critical 日本カーバイド工業株式会社
Publication of WO2012063759A1 publication Critical patent/WO2012063759A1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00Refractors for light sources
    • F21V5/02Refractors for light sources of prismatic shape
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00Lighting devices or systems using a string or strip of light sources
    • F21S4/20Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F21S4/28Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/69Details of refractors forming part of the light source
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Abstract

The purpose of the present invention is to provide an LED lighting device that allows luminous regions to be adjusted easily. This lighting device is provided with at least an LED light source (3) and an optically-transparent protective cover (1) spaced from the LED light source (3) and positioned so as to face light-emitting regions (33) of the LED light source (3), and is characterized in that a prism sheet (4), which is provided with prisms (42) internally or at least on one of the surfaces, is provided between the LED light source (3) and the protective cover (1). Due to this configuration of the LED lighting device, the light-emitting regions can be adjusted easily.

Description

LED lighting device

The present invention relates to an LED illumination device, and more particularly to an LED illumination device that exhibits improved point light source diffusivity and luminance distribution uniformity.

LED lighting devices are about to replace incandescent bulbs and fluorescent lamps, which are conventional lighting devices, because they emit light emitted from an LED light source because of their excellent durability and low energy consumption. As a system for propagating and irradiating light emitted from the LED, there are mainly a sidelight system and a direct system.

A lighting device using a sidelight type LED light source includes a light guide sheet and an LED light source as main components. The LED light source is installed facing the side surface of the light guide sheet. The light guide sheet has a side surface as a light incident surface, and one main surface of the sheet as a light emission surface, and this light emission surface faces the light irradiation direction of the illumination device. Then, light emitted from the LED light source and incident from the side surface of the sheet propagates in the surface direction of the sheet and is emitted from the emission surface of the sheet in the irradiation direction of the illumination device.

Japanese Laid-Open Patent Publication No. 2003-215584 (Patent Document 1) by Shinohara et al. Discloses a side light type surface light emitting device in which a light guide sheet is disposed under a diffusion prism sheet. In this surface light emitting device, the light emitted from the LED light source arranged to face the side surface of the light guide sheet is emitted from one surface of the light guide sheet, and this light is emitted through the diffusion prism sheet. .

Japanese Laid-Open Patent Publication No. 2005-19417 by Kawakami (Patent Document 2) discloses a sidelight type illumination device in which an optical pattern in which a prism surface and a flat surface are formed on a light incident surface of a plate-like light guide. It is disclosed.

Japanese Patent Application Laid-Open No. 2005-183005 (Patent Document 3) by Hatanaka et al. Discloses a backlight having a color mixing unit that refracts three primary color lights into parallel light and mixes them into white light.

Also, in an illuminating device using a direct light type LED light source, the LED light source irradiates light to the light illuminating device and directly or indirectly irradiates this light.

Japanese Laid-Open Patent Publication No. 2003-86849 (Patent Document 4) by Ideue discloses a surface light emitting device in which a color conversion film for converting LED light into white is provided between an LED chip and a diffusion film.

Japanese Patent Laid-Open No. 2011-60719 (Literature 5) by Lee et al. Discloses a lighting device in which an LED light source is disposed in an inner space, and a lens having the effect of a cylindrical lens is formed on the inner wall of a tube. A lighting device is described.

Japanese Patent Laid-Open No. 2003-215584 JP 2005-19417 A JP 2005-183005 A JP 2003-86849 A JP 2011-60719 A

However, since the illumination devices described in Patent Documents 1 to 3 use the side light method, the LED light source needs to be disposed to face the side surface of the light guide sheet, and thus the arrangement position of the LED light source is limited. . In addition, since the light guide sheet emits light from the exit surface while propagating the light, it is difficult to adjust the light to emit the light in a desired direction, and it is difficult to adjust the portion where the illumination device shines. There is a problem.

In addition, although the lighting device described in Patent Document 4 is color-converted, the light control for changing the direction of light is performed by a light diffusion film that is also a cover. Therefore, the part where the light diffusion film shines depends on the light emission direction of the LED light source. That is, when an LED light source with a large light emission angle is used, a wide part of the light diffusion film shines, and when an LED light source with a small light emission angle is used, a narrow part of the light diffusion film shines. However, since the general LED light source cannot usually adjust the light emission angle, it is substantially impossible to adjust the location where the light diffusion film shines unless the LED light source is changed.

Furthermore, in the illumination device described in Patent Document 5, light adjustment is performed to adjust the light emission direction by a cylindrical lens. Since the lens is formed on the inner wall of the tube, the lens and the outer peripheral surface of the tube As a result, the portion where the tube shines depends substantially on the light emission direction of the LED light source.

Therefore, an object of the present invention is to provide an LED lighting device capable of easily adjusting a portion to shine.

In order to solve the above-described problems, the present invention provides an illuminating device including at least an LED light source and a light-transmitting protective cover that is disposed to face the light output portion of the LED light source at a distance from the LED light source. And the prism sheet | seat in which the prism was provided in the inside or at least one surface is installed between the said LED light source and the said protective cover, It is characterized by the above-mentioned.

According to such an LED illumination device, the distance between the protective cover and the prism sheet can be increased, and the light refracted by the prism sheet is changed between the prism sheet and the protective cover in a state in which the traveling direction is changed. Can propagate a long distance. Therefore, when light is irradiated from the protective cover, the part where the protective cover shines can be easily adjusted. For example, in the case of using a prism sheet that diffuses light, even if the light diffusibility of the prism sheet is weak, it is possible to easily increase the area where the protective cover shines. Moreover, when using the prism sheet which condenses light, even if it is a case where the condensing property of the light of a prism sheet is weak, the site | part which a protective cover shines can be made small easily. As described above, the LED illumination device according to the present invention can easily adjust the portion to shine by sufficiently enjoying the effect of refraction of light by the prism sheet.

Further, the prism sheet may be provided with the prism only on one surface. In this case, the prism sheet may be configured such that the prism is provided on the surface on the LED light source side, or the prism sheet is provided on the surface on the protective cover side. Also good. If the prism of the prism sheet is provided on the surface on the LED light source side, a more dispersion effect can be obtained when light from the LED light source is diffused. Further, if the prism of the prism sheet is provided on the surface on the protective cover side, it is possible to obtain a light condensing effect when condensing light from the LED light source.

Alternatively, the prism sheet may be provided with the prisms on both sides. By providing the prisms on both sides of the prism sheet, it becomes easier to design the light control by the prism sheet than when the prism sheet is provided only on one side, and the traveling direction of light in the prism sheet can be greatly changed.

Alternatively, the prism sheet may be formed by laminating a plurality of layers having different refractive indexes, and the prism may be provided at an interface between two layers laminated together. In this case, the light is refracted inside the prism sheet. In addition, since the prism is at the interface, the prism element can be prevented from being deformed due to scratches or the like when the prism sheet is attached, and light can be adjusted accurately.

The protective cover may be cylindrical, and the LED light source may be installed in a space inside the protective cover. By making the protective cover cylindrical, it is possible to provide a lighting device that can replace the fluorescent tube.

Alternatively, the protective cover may have a semi-cylindrical shape, and the LED light source may be installed in a space inside the protective cover. By forming the protective cover in a semicircular cross section, it is possible to provide a lighting device that is convenient for mounting on a wall surface or ceiling.

The prism may be any one of a triangular prism linear prism, a linear Fresnel lens, a cross prism, a triangular pyramid prism, a Fresnel lens, and a hexagonal prism. In particular, the prism is a cross prism, a triangular pyramid prism. Any one of hexagonal prisms is preferable. Since the cross prism has four orientations, the triangular pyramid prism has six orientations, and the hexagonal prism has three orientations, the light can be adjusted more easily than a linear prism having two orientations.

Further, it is preferable that a light diffusion sheet is installed between the protective cover and the LED light source so as to overlap the prism sheet. By comprising in this way, the light path from an LED light source to a protective cover can be adjusted appropriately combining the light control by a prism sheet, and the spreading | diffusion of the light by a light-diffusion sheet.

Further, in this case, a light diffusion sheet may be installed between the prism sheet and the protective cover, and a light diffusion sheet is installed between the LED light source and the prism sheet. It's also good.

Alternatively, a light diffusion layer may be laminated in the prism sheet. Even in such a configuration, it is possible to appropriately adjust the light path from the LED light source to the protective cover by performing light diffusion using the light diffusion layer while performing light control with the prism.

Alternatively, the prism sheet may be made of a light diffusing material. Even in such a configuration, the light can be dimmed by the prism while diffusing the light in the prism sheet, and the light path from the LED light source to the protective cover by the combination of the dimming and the light diffusion. Can be adjusted appropriately.

In addition, in the optical axis direction of the LED light source, when the distance from the LED light source to the exit surface of the protective cover is 1, the distance from the LED light source to the prism may be 0.5 or less. preferable.

By installing the prism sheet on the LED light source side in this way, the distance between the prism sheet and the protective cover can be made sufficiently large, and the light refraction effect by the prism sheet can be fully enjoyed to protect the light. Can be irradiated from the cover.

Furthermore, in the optical axis direction of the LED light source, when the distance from the LED light source to the exit surface of the protective cover is 1, the distance from the LED light source to the prism is 0.005 to 0.3. Is more preferable, and 0.01 to 0.1 is more preferable.

As described above, according to the present invention, an LED lighting device capable of easily adjusting a light emitting part is provided.

It is a cross-sectional perspective view explaining the structure of the LED lighting apparatus in a reference form. It is a cross-sectional perspective view explaining the structure of the LED lighting apparatus in 1st Embodiment of this invention. It is a figure which shows the structure of the cross section of the LED lighting apparatus shown in FIG. It is a figure which shows the example of the prism sheet using the linear prism which can be used as a prism sheet shown in FIG. It is a figure which shows the example of the prism sheet using the other linear prism which can be used as a prism sheet shown in FIG. It is a figure which shows the example of the prism sheet using the cross prism which can be used as a prism sheet shown in FIG. It is a figure which shows the example of the prism sheet using the triangular pyramid prism which can be used as a prism sheet shown in FIG. It is a figure which shows the example of the prism sheet using the hexagonal prism which can be used as a prism sheet shown in FIG. It is a cross-sectional perspective view explaining the structure of the LED lighting apparatus in 2nd Embodiment of this invention. It is a figure which shows an example of the structure of one surface of the prism sheet which can be used as a prism sheet shown in FIG. It is a figure which shows an example of the structure of the other surface of the prism sheet which can be used as a prism sheet shown in FIG. It is a cross-sectional perspective view explaining the structure of the LED lighting apparatus in 3rd Embodiment of this invention. It is a cross-sectional perspective view explaining the structure of the LED lighting apparatus in 4th Embodiment of this invention. It is a cross-sectional perspective view explaining the structure of the LED lighting apparatus in 5th Embodiment of this invention. It is a figure which shows the prism sheet of FIG. It is a figure which shows the modification of the prism sheet which can be used for a LED lighting apparatus. It is a figure which shows the relationship between the radiation angle and relative luminance in Example 1 and Comparative Example 1. It is a figure which shows the relationship between the radiation angle and relative brightness in Example 2 and Comparative Example 1. It is a figure which shows the relationship between the radiation angle and relative luminance in Example 3 and Comparative Example 1. It is a figure which shows the relationship between the radiation angle in Example 4 and Comparative Example 1, and relative luminance. It is a figure which shows the relationship between the radiation angle and relative brightness in Example 5 and Comparative Example 1. It is a figure which shows the relationship between the radiation angle and the relative luminance in the comparative example 1 and the comparative example 2.

Hereinafter, preferred embodiments of the LED lighting device according to the present invention will be described in detail with reference to the drawings.

(Reference form)
First, the LED lighting device in the reference mode will be described so that the LED lighting device of the present invention can be easily understood.

FIG. 1 is a diagram showing an LED lighting device according to a reference embodiment. This LED lighting device includes a protective cover 1, a base 2 disposed in a space in the protective cover 1, and an LED light source 3 disposed on the base 2 as main components.

The protective cover 1 in this embodiment is made of a light transmissive material and is formed in a cylindrical shape. The light transmissive property may be light transmissive, may be colorless and transparent, may be colored, and may be milky white or the like. Further, the total light transmittance of the protective cover 1 is preferably 30% or more and more preferably 80% or more when measured using an A light source based on JIS K7105. The material constituting the protective cover 1 is not particularly limited as long as it is light transmissive, but various synthetic resins and various glasses can be used. Examples of such synthetic resin include polycarbonate resin, acrylic resin, acrylic styrene resin, vinyl chloride resin, and polyethylene terephthalate resin.

Also, the protective cover 1 can be used in combination with various inorganic fine powders and organic fine powders for the purpose of diffusing light and diffusing the light of the protective cover 1. These fine powders may be used by mixing in the above synthetic resin or glass, or may be dispersed in another synthetic resin and applied to the surface.

Examples of such inorganic fine powders include sodium oxide, calcium oxide, aluminum oxide, bismuth oxide, cerium oxide, copper oxide, silicon dioxide (silica), tin oxide, yttrium oxide, zinc oxide, titanium oxide, zirconium oxide, Examples include glass, quartz, diamond, sapphire and talc. Examples of the organic fine powder include melamine resin, (meth) acrylic resin, urethane resin, styrene resin, polyolefin resin, and fluororesin.

These fine powders are preferably those having a large difference in refractive index from the synthetic resin or glass as a mixed medium because of excellent light scattering properties.

It should be noted that the protective cover 1 is formed with a pair of fixed convex portions 13 that protrude into the inner space and fix the base 2.

The LED light source 3 includes a flat substrate 31 and a plurality of light emitting element portions 32 arranged on the substrate 31. The board | substrate 31 is comprised from materials, such as a metal, ceramics, resin, for example. The light emitting element portion 32 is formed by placing an LED chip in a frame made of ceramic or the like. A part of the upper surface (surface opposite to the substrate 31 side) of the light emitting element portion 32 is a light output portion 33 from which light is emitted. Although not particularly illustrated, the substrate 31 is provided with wiring for applying power to the LED chip.

Various types of LED chips can be used for the light emitting element section 32, and the wavelength of light emitted from the LED chips is not particularly limited. In addition, a dye layer for wavelength conversion and a resinous lens for diffusing light may be directly installed on the LED chip. Moreover, you may install the reflector for directing the light which went to the light emission part 33 side opposite to the light emission part 33 side (back side) to the light emission part 33 side. As a material of the reflector, various ceramics, metals, synthetic resins subjected to vapor deposition or plating, synthetic resins containing a white pigment, and the like can be used.

The base 2 includes a curved portion 21 that is curved along the inner wall of the protective cover 1 and a flat plate portion 22 that is connected to the curved portion 21 and formed in a flat plate shape. The LED light source 3 is fixed to the flat plate portion 22 of the base 2, and various electrical wirings and electrical components are installed on the base 2. The base 2 is installed in the space inside the protective cover 1 with the outside of the curved portion 21 being in close contact with the inner wall of the protective cover 1. In this state where the base 2 is installed in the space in the protective cover 1, the pair of fixed convex portions 13 provided on the protective cover 1 are in contact with the flat plate portion 22 of the base 2, respectively. The movement of the base 2 along the circumferential direction of the protective cover 1 is restricted.

Further, from the viewpoint of efficiently dissipating heat generated by the LED light source 3, the base 2 is preferably made of metal. As a preferred metal, an aluminum alloy can be exemplified. However, the base 2 need not be made of metal, and may be made of resin or ceramics.

In the LED light source device according to such a reference form, electric power supplied from the outside is applied to the LED chip of the LED light source 3, and light is emitted from the light emitting part 33 of the LED chip. The emitted light is irradiated to the outside through the protective cover 1. That is, in the protective cover 1, the inner peripheral surface 12 is a light incident surface, and the outer peripheral surface 11 is a light emitting surface. And in the protective cover 1, there exists a tendency for the part irradiated with the light from the LED light source 3 to become bright.

In this embodiment, in order to adjust the size of the brightened portion, the spread of light emitted from the LED light source 3 is adjusted by mounting the light emitting element portion 32 having the desired light spread of the LED light source 3. There is a need to.

(First embodiment)
Next, a first embodiment of the present invention will be described in detail with reference to FIG. In addition, about the component which is the same as that of the above-mentioned reference form, the same description is attached | subjected and the overlapping description is abbreviate | omitted except the case where it demonstrates especially.

FIG. 2 is a cross-sectional perspective view illustrating the structure of the LED lighting device according to the present embodiment. The LED illumination device according to the present embodiment includes at least an LED light source 3 and a light-transmitting protective cover 1 that is disposed opposite to the LED light source 3 and facing the light output part 33 of the LED light source 3. A prism sheet 4 provided with a prism is installed between the LED light source 3 and the protective cover 1. That is, the LED lighting device of the present embodiment is different from the LED lighting device of the reference embodiment described above in that the prism sheet 4 is installed between the LED light source 3 and the protective cover 1.

The prism sheet 4 of the LED illumination device shown in FIG. 2 is provided with a prism 42 only on one surface. The prism sheet 4 is made of a light transmissive sheet. Examples of the material of the prism sheet 4 include the same materials as the material of the protective cover 1. The prism sheet 4 can refract light incident from one surface by the prism 42 and output the light from the other surface.

The base 2 is provided with a pair of holding portions 23 for sandwiching and holding the prism sheet 4, and the holding portions 23 are connected to the flat plate portion 22. The prism sheet 4 is held at a distance from the protective cover 1 and the LED light emitting part with both ends fixed to the holding part 23 and the prism 42 facing the light emitting part 33 of the LED light source 3. .

FIG. 3 is a diagram showing a cross-sectional structure of the LED lighting device shown in FIG. As shown in FIG. 3, in the LED lighting device of the present embodiment, the distance L1 from the light output portion 33 of the LED light source 3 to the prism 42 is protected from the prism 42 in the optical axis direction of the LED light source 3 indicated by the broken line arrow. The distance to the emission surface of the cover 1 is not more than L2. That is, in the optical axis direction of the LED light source 3, when the distance L from the light output part 33 of the LED light source 3 to the output surface that is the outer peripheral surface 11 of the protective cover 1 is 1, the light output part 33 of the LED light source 3 is connected to the prism. The distance L1 to the prism 42 of the sheet 4 is 0.5 or less. Then, in the optical axis direction of the LED light source 3, when the distance L from the light output part 33 of the LED light source 3 to the emission surface of the protective cover 1 is 1, the prism 42 of the prism sheet 4 from the light output part 33 of the LED light source 3. The distance L1 is more preferably 0.005 to 0.3, and still more preferably 0.01 to 0.1. If the distance L1 is 0.5 or less, it is possible to sufficiently obtain a dimming effect in the space in the protective cover, and it is possible to suppress the prism sheet 4 from being conspicuous from the outside of the protective cover 1. Furthermore, the installation work of the prism sheet 4 becomes easy. Further, when the distance L1 is 0.005 or more, and more preferably 0.1 or more, the prism sheet can be prevented from being deformed by heat generated from the LED module.

The distance L1 from the light output portion 33 of the LED light source 3 to the prism 42 and the distance L2 from the prism 42 to the exit surface of the protective cover 1 are changed by changing the height of the holding portion 23 from the flat plate portion 22. Can do. And the light in the outer peripheral surface 11 (outgoing surface) of the protective cover 1 changes by the distance L1 from the light output part 33 of the LED light source 3 to the prism 42, and the distance L2 from the prism 42 to the outgoing surface of the protective cover 1 changing. The degree of diffusion and condensing can be changed, and the region where the protective cover 1 shines can be changed.

Here, the prism 42 provided on the prism sheet 4 will be described in more detail. The prism 42 includes a shape whose refractive surface is a curved surface. For example, at least one refracting surface of the surfaces constituting the triangular prism linear prism or the triangular pyramid prism may be a curved surface.

Further, in the present embodiment, the prism 42 provided on the prism sheet is a triangular prism linear prism, linear Fresnel lens, cross prism, triangular pyramid prism, Fresnel lens, hexagonal prism, or the like alone or in combination. Among them, a cross prism, a triangular pyramid prism, and a hexagonal prism are preferable. Further, it is preferable that the triangular pyramid prism and the hexagonal prism are cube corner prisms whose side surfaces are in a relationship of 90 degrees with each other. And what kind of prism is installed can be appropriately selected according to the illumination pattern of the illumination device.

When a plurality of light emitting element portions 32 (LED chips) of the LED light source 3 are provided, the linear prisms such as the triangular prism linear prism and the linear Fresnel lens are arranged so that the direction of the groove is aligned with the light emitting element portion 32. It is preferable that the prism sheet 4 is installed. For example, in an LED lighting device using a cylindrical protective cover 1, a plurality of light emitting element portions 32 are often installed along the longitudinal direction of the protective cover. In this case, a triangular prism linear prism, The linear prism such as a linear Fresnel lens is preferably provided with the prism sheet 4 so that the direction of the groove is along the longitudinal direction of the cylindrical protective cover 1.

As described above, the linear prism in which the grooves are arranged in parallel with the plurality of light emitting element portions 32 has an LED light source in the direction of the tangent line of the curve defined by the arrangement of the LED chips or the plane perpendicular to the straight line. Since the light from the light can be spread or narrowed, it has a remarkable effect on the uniformity of the luminance distribution. This is particularly effective when spreading light.

On the other hand, in a prism having three or more directions such as a cross prism, a triangular pyramid prism, or a Fresnel lens, the refraction direction of light can be controlled in various directions. It has a remarkable effect in both uniformity of brightness distribution of emitted light and diffusivity.

In addition, the orientation of the prism in this specification means the number of directions of the prism side surfaces other than the incident surface constituting the prism. In the linear prism, the azimuth has two azimuths, and the directions are 180 degrees opposite each other. On the other hand, the cross prism has four azimuths, and the triangular pyramid prism has six azimuths because there are two triangular pyramid prisms that are rotated 180 degrees and face each other.

Further, when a concentric Fresnel lens is used, the center position of the Fresnel lens and the position of the optical axis of the light emitted from the LED light source 3 are matched so that the light output portion 33 of the LED light source 3 is connected to the Fresnel lens. It is preferable to use the same number as that in combination. Such a Fresnel lens is particularly effective in improving the light diffusibility. And when installing the other prism which is responsible for the improvement of luminance distribution uniformity on the other surface, it can be set as the LED lighting device which has more superior performance.

The light refraction angle can be controlled by changing the angle (side angle) formed by a plurality of side surfaces of the prism. In general, when the angle of light emitted from the LED light source 3 with respect to incident light on the prism 42 is increased, it is preferable to design the side surface angle to be large. Furthermore, it is possible to precisely control the light by installing the prisms 42 on both sides.

Further, it is preferable that the individual side angles are changed symmetrically around the light output portion 33 of the LED light source 3 in order to obtain uniform luminance distribution. The change pattern is preferably changed depending on the target luminance distribution pattern. In general, it is preferable to increase the side surface angle of the prism 42 at the central portion and decrease the side surface angle of the prism 42 at the outer peripheral portion.

In the triangular pyramid prism, a cube-corner retroreflective element whose three side surfaces are substantially perpendicular to each other can also be used. In the cube corner retroreflective element, the light reflected on the surface of the protective cover 1 and returned to the light source direction can be returned to the original direction. Therefore, by making the prism 42 a cube-corner retroreflective element, light incident on the prism sheet 4 from the outside via the protective cover 1 can be retroreflected toward the protective cover 1. In addition, the prism side surfaces in six directions are particularly preferable because they provide uniform luminance distribution performance.

The cube-corner retroreflective element may be a shape other than the triangular pyramid prism, for example, a cube-corner retroreflective element whose incident surface has a square or hexagonal shape. In particular, a hexagonal cube corner retroreflective element is preferable because of its excellent retroreflective efficiency.

FIG. 4 is a diagram showing an example of a prism sheet using the above-described linear prism that can be used as the prism sheet 4 shown in FIG. The projections of the linear prism are symmetrical, and the angle formed by the two prism side surfaces can be arbitrarily changed. As shown in FIG. 4, the prism sheet has a rectangular shape, and the longitudinal direction is set along the longitudinal direction of the protective cover 1 shown in FIG. Accordingly, the groove direction of the linear prism is formed along a direction perpendicular to the longitudinal direction of the protective cover 1, but may be formed along the longitudinal direction of the protective cover 1.

FIG. 5 is a diagram showing an example of a prism sheet using another linear prism that can be used as the prism sheet 4 shown in FIG. The projection of the linear prism has an asymmetric shape, and the angle formed by the two prism side surfaces can be arbitrarily changed. In addition, the angle formed by the prism side surfaces may be periodically changed with respect to the angle of the adjacent prism.

FIG. 6 is a diagram showing an example of a prism sheet using the above-described cross prism that can be used as the prism sheet 4 shown in FIG. The shape of the bottom surface of the cross prism in FIG. 6 is a square, but a cross prism having a rectangular bottom surface shape may be used. Further, similarly to the linear prism shown in FIG. 5, the angle formed by the two prism side surfaces adjacent to each other can be arbitrarily changed.

FIG. 7 is a diagram showing an example of a prism sheet using the above-described triangular pyramid prism that can be used as the prism sheet 4 shown in FIG. In the triangular pyramid prism, a cube-corner retroreflective element whose three side surfaces are substantially perpendicular to each other can also be used. In the cube-corner retroreflective element, the light incident from the outside of the lighting device through the protective cover or the light reflected on the surface of the protective cover 1 and returning to the light source direction is reflected to return to the original direction. be able to. In addition, the surface of the 6-directional prism can provide uniform luminance distribution performance.

FIG. 8 is a diagram showing an example of a prism sheet using the above-described hexagonal prism that can be used as the prism sheet 4 shown in FIG. In particular, FIG. 8 shows a hexagonal cube corner prism in which the angle between the side surfaces of the hexagonal prism is 90 degrees. By using such a prism, the light incident from the outside of the LED lighting device through the protective cover or the light reflected on the surface of the protective cover 1 and returning to the light source direction is reflected with high efficiency, and the original light is reflected. It can be returned to the direction.

According to the illumination device of the present embodiment described above, the light emitted from the light output portion 33 of the LED light source 3 is refracted by the prism sheet 4, and the refracted light is changed in the traveling direction by the prism 42. The light propagates between the prism sheet 4 and the protective cover 1. And since the prism sheet 4 of this embodiment is installed in the space inside the protective cover 1, the distance of the protective cover 1 and the prism sheet 4 can be enlarged. Therefore, when the protective cover 1 is irradiated with light, the part where the protective cover 1 shines can be easily adjusted. For example, in the case of using a prism sheet that diffuses light, since the refraction by the prism is small, even if the light diffusibility of the prism sheet is weak, the portion where the protective cover 1 shines can be easily increased. it can. Further, when a prism sheet that collects light is used, since the refraction by the prism is small, even if the light collecting property of the prism sheet is weak, the portion where the protective cover 1 shines is easily reduced. be able to. As described above, the LED illumination device according to the present invention can easily adjust the shining portion by sufficiently enjoying the light refraction effect of the prism sheet 4.

Further, in the LED illumination device of the present embodiment, in the optical axis direction of the LED light source 3, as described above, the distance L1 from the light output portion 33 of the LED light source 3 to the prism 42 is the emission surface of the protective cover 1 from the prism 42. Or less than the distance L2. By installing the prism sheet 4 on the LED light source 3 side in this way, the distance between the prism sheet 4 and the protective cover 1 can be sufficiently increased, and the effect of light refraction by the prism sheet 4 can be fully enjoyed. Thus, light can be emitted from the protective cover.

In the LED lighting device of the present embodiment, the prism 42 is provided only on one surface of the prism sheet 4, and the prism sheet 4 is disposed inside the protective cover 1 in a state where the prism 42 faces the LED light source 3 side. Was installed in the space. However, the prism 42 may be provided on the protective cover 1 (the side opposite to the LED light source 3 side). That is, the prism sheet 4 may be installed in the space in the protective cover 1 with the prism 42 facing the protective cover 1 side. In this case, in the case where the light from the LED light source 3 is condensed, it is preferable because a light condensing effect can be obtained.

In this embodiment, the protective cover 1 is cylindrical, and the prism sheet 4 is installed between the LED light source 3 and the protective cover 1 installed in the space inside the protective cover 1. Here, unlike the present embodiment, an LED lighting device is assumed in which the protective cover is cylindrical, but the prism is integrally formed on the inner wall surface of the protective cover, and the prism sheet is not installed in the space inside the protective cover. A cylindrical protective cover is generally manufactured by extrusion molding. However, the shape of a prism molded by extrusion is almost limited to a linear prism, and it is sufficient that the height of the prism is not more than about 1 mm. There is a limitation that the prism cannot be molded while maintaining accuracy. However, in the present embodiment, the prism sheet 4 is manufactured separately from the protective cover 1, so that the prism shape can be easily formed in accordance with a desired dimming state. As a method for manufacturing the prism sheet 4 in the present embodiment, for example, a method in which a mold having an inverted shape is prepared in advance, and various synthetic resins are heated and pressed together with the mold, and transferred can be employed. Therefore, even when the height of the prism 42 is small, the shape of the prism 42 can be accurately manufactured. The height of the prism 42 of the prism sheet 4 in the present embodiment is not particularly limited, but is, for example, 0.5 μm to 750 μm, preferably 5 μm to 250 μm. When the height of the prism 42 is 0.5 μm or more, the prism 42 can be transferred with high accuracy, and when the height of the prism 42 is 750 μm or less, the prism does not stand out and the LED illumination device has an excellent appearance. be able to. Moreover, since the prism sheet 4 is a separate body from the protective cover 1, attachment and removal are easy.

(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to FIG. In addition, about the component which is the same as that of 1st Embodiment, or an equivalent component, the overlapping description is abbreviate | omitted except the case where it attaches | subjects the same referential mark and demonstrates in particular. FIG. 9 is a cross-sectional perspective view illustrating the structure of the LED lighting device in the present embodiment.

As shown in FIG. 9, the LED certification device of this embodiment is different from the LED lighting device of the first embodiment in that prisms 42 are provided on both surfaces of the prism sheet 4. By providing the prisms 42 on both sides of the prism sheet 4 in this way, even if the light refraction by the prism 42 is small, the prism sheet 4 as a whole can refract the light greatly.

As the prisms 42 provided on both sides of the prism sheet 4, the prisms exemplified in the description of the first embodiment can be used. The prisms 42 provided on both surfaces of the prism sheet 4 may be the same type of prisms or different types of prisms. Also, the prisms may be light diffusive to each other, the prism formed on one surface may be light diffusive, and the prism provided on the other surface may be light condensing. Even when the same kind of prisms are provided on both surfaces of the prism sheet 4, the size and direction thereof may be the same or different from each other.

As described above, by appropriately selecting the combination of the prisms 42 provided on both surfaces of the prism sheet 4, it is possible to appropriately select how the light is refracted in the prism 42, and to appropriately control the light diffusibility and the light condensing property. can do.

For example, when linear prisms are provided on both sides of the prism sheet 4, it is preferable that the directions of the grooves of the linear prisms formed on one surface and the other surface are orthogonal to each other. By providing the prisms on both sides as described above, the prism sheet 4 has four directions in total, and the light can be dimmed in the directions orthogonal to each other on both sides of the prism sheet 4. For example, when the prisms 42 on both sides exhibit diffusibility with respect to light emitted from the LED light source 3, the light can be adjusted so as to diffuse more uniformly. Therefore, the diffusibility of the light emitted from the LED light source 3 which is a point light source can be further improved.

In addition, for example, when a cross prism is provided on one surface and a triangular pyramid prism is provided on the other surface, the prism sheet 4 has a total of 10 orientations, and light can be further adjusted. it can. Also in this case, when the prisms 42 on both sides exhibit diffusibility with respect to the light emitted from the LED light source 3, the diffusibility of the light emitted from the LED light source that is a point light source can be further improved. . In addition, a triangular pyramid prism is provided on one surface, and a triangular pyramid prism is provided on the other surface so that the directions of the prisms are orthogonal to each other. Even in this case, when the prisms 42 on both sides exhibit diffusibility with respect to the light emitted from the LED light source 3, the light can be adjusted more uniformly.

10 and 11 are diagrams showing examples of prism sheets that can be used as the prism sheet 4 shown in FIG. Specifically, FIG. 10 is a diagram illustrating an example of the structure of one surface of the prism sheet, and FIG. 11 is a diagram illustrating an example of the structure of the other surface of the prism sheet. As shown in FIG. 10, a cross prism is provided on one surface of the prism sheet. The shape of the bottom surface of the cross prism is a square, but the shape of the bottom surface may be a rectangle. Further, similarly to the cross prism shown in FIG. 6, the angle formed by the two adjacent prism side surfaces and the size of the adjacent prisms can be arbitrarily changed.

As shown in FIG. 11, a linear prism is provided on the other surface of the prism sheet. This linear prism is the same as the linear prism of the prism sheet shown in FIG. 4, but in the same way as the linear prism provided on the prism sheet shown in FIG. The angle formed between the two prism side surfaces may be arbitrarily changed, and the angle formed between the prism side surfaces may be periodically changed with respect to the angle of the adjacent prism.

As described above, the prism sheets in the LED lighting device of the present embodiment can have different shapes for the prisms provided on both sides. For example, when the prism formed on one surface is a retroreflective element having retroreflectivity such as a cube-corner triangular pyramid prism or a hexagonal prism, the prism having retroreflectivity is The prism sheet is placed in the space inside the protective cover 1 with the surface on the side facing the LED light source 3 and the other surface provided with the other prisms facing the protective cover 1 side (opposite the LED light source 3 side). It is preferable to install. By installing the prism sheet in this way, the light incident from the outside of the lighting device through the protective cover or the light reflected on the surface of the protective cover 1 and returning to the LED light source 3 is reflected by the retroreflective element. It can be reflected with high efficiency by a certain prism and returned to the original direction, and the light emitted from the LED light source 3 is refracted in a desired direction by the prism provided on one surface and the other surface. be able to.

When the prisms 42 are provided on both sides of the prism sheet 4 as in the LED lighting device of the present embodiment, the distance L1 illustrated in FIG. 3 is equal to the light output part 33 of the LED light source 3 and the light output part 33 of the LED light source 3. The distance L2 means the distance between the prism on the opposite side to the light output part 33 side of the LED light source 3 and the exit surface of the protective cover 1. .

(Third embodiment)
Next, a third embodiment of the present invention will be described in detail with reference to FIG. In addition, about the component which is the same as that of 1st Embodiment, or an equivalent component, the overlapping description is abbreviate | omitted except the case where it attaches | subjects the same referential mark and demonstrates in particular. FIG. 12 is a cross-sectional perspective view illustrating the structure of the LED lighting device in the present embodiment.

As shown in FIG. 12, the LED lighting device of the present embodiment is the first implementation in that a light diffusion sheet 5 is installed between the protective cover 1 and the LED light source 3 so as to overlap the prism sheet 4. It differs from the LED lighting device of the form. The light diffusion sheet 5 may be installed between the LED light source 3 and the prism sheet 4, or may be installed between the prism sheet 4 and the protective cover as shown in FIG.

The light diffusion sheet 5 is light transmissive and has a property of diffusing transmitted light.

The light diffusion sheet 5 is preferably installed in the vicinity of the prism sheet 4 in order to increase the light scattering effect, and is particularly preferably installed in close contact with the prism sheet 4 as shown in FIG. preferable.

Examples of the light diffusion sheet 5 include a sheet made of a light-transmitting synthetic resin or glass coated with various inorganic fine powders and organic fine powders as a single layer, and a light-transmitting material in which these fine powders are dispersed. The sheet | seat which consists of a synthetic resin and glass can be mentioned.

Examples of such inorganic fine powder and organic fine powder include inorganic fine powder and organic fine powder used in the protective cover 1 for the purpose of diffusing light.

In addition, it is preferable that these fine powders have a larger difference in refractive index from the synthetic resin or glass to be dispersed because of excellent light diffusibility.

Further, as the light diffusion sheet 5, a sheet having a fine uneven shape formed on at least one of the light incident surface side and the light emission surface side can be used. In this case, the fine powder is dispersed. You may do it.

According to the LED lighting device according to the present embodiment, the light path from the LED light source 3 to the protective cover 1 is appropriately adjusted by combining the light control by the prism sheet 4 and the light diffusion by the light diffusion sheet 5. be able to. In particular, when the prism sheet 4 is light diffusive, the prism sheet 4 and the light diffusing sheet 5 exhibit more excellent light diffusibility, and the area where the protective cover 1 shines can be increased. It is possible to uniformly illuminate a wide area of.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described in detail with reference to FIG. In addition, about the component same or equivalent to 2nd Embodiment, the overlapping description is abbreviate | omitted except the case where it attaches | subjects the same referential mark and demonstrates in particular. FIG. 13 is a cross-sectional perspective view illustrating the structure of the LED lighting device in the present embodiment.

As shown in FIG. 13, the LED illumination device according to the present embodiment is the second embodiment in that a light diffusion sheet 5 is installed between the protective cover 1 and the LED light source 3 so as to overlap the prism sheet 4. It differs from the LED lighting device of the form. As in the third embodiment, the light diffusion sheet 5 may be installed between the LED light source 3 and the prism sheet 4, and as shown in FIG. 13, between the prism sheet 4 and the protective cover. It may be installed.

This light diffusion sheet 5 has the same configuration as that of the third embodiment. The light diffusion sheet 5 is preferably installed in the vicinity of the prism sheet 4 in order to increase the light scattering effect. The light diffusion sheet 5 may be installed in close contact with the prism on the protective cover 1 side of the prism sheet 4. Particularly preferred.

According to the LED illumination device according to the present embodiment, the light path from the LED light source 3 to the protective cover 1 can be adjusted more appropriately than the LED illumination device of the third embodiment.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described in detail with reference to FIGS. In addition, about the component same or equivalent to 2nd Embodiment, the overlapping description is abbreviate | omitted except the case where it attaches | subjects the same referential mark and demonstrates in particular.

FIG. 14 is a cross-sectional perspective view illustrating the structure of the LED lighting device according to this embodiment. As shown in FIG. 13, the LED illumination device of this embodiment is different from the LED illumination device of the second embodiment in that a prism sheet 4 ′ is used instead of the prism sheet 4.

FIG. 15 is a diagram showing the prism sheet 4 ′ in FIG. 14. As shown in FIG. 15, the prism sheet 4 ′ of the present embodiment includes a first prism layer 4a in which a prism 42 is formed on one side, a second prism layer 4b in which a prism 42 is formed on one side, and a first prism. The light diffusion layer 5a is laminated between the layer 4a and the second prism layer 4b. Specifically, the surfaces of the first prism layer 4a and the second prism layer 4b where the prism 42 is not formed face each other, and the surfaces where these prisms 42 are not formed are both surfaces of the light diffusion layer 5a. It is in close contact with. Thus, the first prism layer 4a, the light diffusion layer 5a, and the second prism layer 4b are laminated in this order. Thus, the prism sheet 4 ′ is a sheet in which the prisms 42 are formed on both surfaces and the light diffusion layer 5 a is laminated.

The first prism layer 4a and the second prism layer 4b have, for example, the same configuration as the prism sheet 4 in the first embodiment. The relationship between the prisms 42 provided in the first prism layer 4a and the second prism layer 4b is the same as that of the prisms 42 provided on both surfaces of the prism sheet 4 of the second embodiment.

The configuration of the light diffusion layer 5a is the same as that of the light diffusion sheet 5 in the third embodiment, for example.

According to the LED illumination device of the present embodiment, the dimming by the prism 42 in the first prism layer 4a and the second prism layer 4b and the light diffusion by the light diffusion layer 5a are combined to provide the protective cover 1 from the LED light source 3. It is possible to appropriately adjust the light path leading up to. Furthermore, in this embodiment, since the prism sheet 4 ′ has a light diffusion layer, it is not necessary to install a light diffusion sheet in addition to the prism sheet as in the third and fourth embodiments. Therefore, even when the space in the protective cover 1 is narrow, refraction by the prism 42 and light diffusion by the light diffusion layer 5a can be realized, and the light path can be adjusted appropriately.

In the present embodiment, the prism 42 is provided on one side of each of the first prism layer 4a and the second prism layer 4b, but the prism 42 is provided only on one side of one prism layer. The prism 42 does not have to be provided on the other prism layer. In this case, the prism sheet 4 ′ is a sheet in which the prism 42 is provided only on one surface.

As mentioned above, although each embodiment was described as an example about the present invention, the present invention is not limited to the above-mentioned embodiment.

For example, in the first embodiment or the second embodiment, the material of the prism sheet 4 may be the same as that of the light diffusion sheet 5 of the third embodiment or the fourth embodiment. By doing in this way, the prism sheet 4 consists of a material which has light diffusivity.

In the above embodiment, the prism 42 is formed on at least one surface of the prism sheets 4 and 4 ′. However, the prism sheet used in the LED lighting device of the present invention is not limited to such an example. FIG. 16 is a diagram showing a modification of the prism sheet that can be used in the LED lighting device of the embodiment. In the description of the present modification, the same or equivalent components as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted unless specifically described.

As shown in FIG. 16, the prism sheet in the present modification example includes a first prism layer 4d, a low refractive index layer 4c, and a second prism layer 4e. The first prism layer 4d and the second prism layer 4e have the same refractive index. The refractive index of the low refractive index layer 4c is lower than those of the twelfth prism layer 4d and the second prism layer 4e. The first prism layer 4d and the second prism layer 4e are made of the same material as the prism sheet 4 in the first embodiment, for example. The material of the low refractive index layer 4c is, for example, a material obtained by adding a dopant that lowers the refractive index, such as fluorine, to the same material as the first prism layer 4d and the second prism layer 4e.

The first prism layer 4d and the second prism layer 4e are each provided with a prism 42 on one surface, and the other surface is a flat surface. The surfaces on which the prisms 42 are provided face each other, and the surfaces on which the prisms 42 are provided are in close contact with both surfaces of the low refractive index layer 4c. Accordingly, the first prism layer 4d, the low refractive index layer 4c, and the second prism layer 4e are laminated in this order. Thus, the prism sheet of this modification is formed by laminating a plurality of layers that are flat on both sides and different in refractive index, and the prism 42 is provided at the interface between the two layers that are laminated together.

In this modification, the low refractive index layer 4c is laminated between the first prism layer 4d and the second prism layer 4e. However, instead of the low refractive index layer 4c, the first prism layer 4d and the second prism layer 4c are stacked. A high refractive index layer having a higher refractive index than that of the prism layer 4e may be laminated. Further, at least one of the first prism layer 4d, the second prism layer 4e, the low refractive index layer 4c, and the high refractive index layer is formed in the same manner as the light diffusion layer 5a in the fifth embodiment. It may be a diffusive layer.

In the above embodiment, in the optical axis direction of the LED light source 3, the distance L1 from the light output portion 33 of the LED light source 3 to the prism 42 is set to be equal to or less than the distance L2 from the prism 42 to the exit surface of the protective cover 1. However, the present invention is not limited to this.

In the above embodiment, the protective cover 1 has a cylindrical shape. However, the present invention is not limited to this, and the outer shape of the protective cover 1 can be any shape. For example, the protective cover 1 may be cylindrical and the cross-sectional shape may be rectangular or elliptical. Alternatively, even if the protective cover is flat, the protective cover is installed on the front surface of the rectangular metal casing, the LED light source is disposed in the casing, and the prism sheet is disposed between the LED light source and the protective cover. good. The protective cover may be a semi-cylindrical shape with a semicircular cross section. In this case, the LED light source may be installed in a space in the protective cover, that is, in a groove formed by the protective cover, and a prism sheet may be disposed between the LED light source and the protective cover. Furthermore, the shape of the protective cover may be a substantially spherical shape. In these cases, the prism sheet may be the same as in the above-described embodiment or modification.

Further, in the above-described embodiments and modifications, the prism sheet is arranged in a flat plate state. However, the present invention is not limited to this, and the prism sheet may be arranged in a curved state. Specifically, it is preferable to bend so as to surround the light output portion of the LED light source, and it is more preferable to bend so that the distance from the light output portion of the LED light source to the prism sheet is equal.

In addition, each modification may be applied to the above embodiment, or a part of the above embodiment or modification may be combined.

Hereinafter, the contents of the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these.

<Comparative Example 1>
An LED chip (white LED product number NSPW300DS manufactured by Nichia Corporation) is 10 mm in the space inside a protective cover made of polycarbonate (refractive index 1.58) with a tube diameter of 26 mm and a tube thickness of 0.5 mm. LED modules as LED light sources arranged at intervals were installed to form an LED lighting device.

Next, the LED lighting device was attached to a goniometer with the longitudinal direction thereof being horizontal. In addition, a spectroradiometer (SR-3AR 0.2 ° field of view manufactured by Topcon Co., Ltd.) was installed in front of the LED light source of the LED illuminator, keeping the distance between the LED illuminator and the spectroradiometer at 400 mm.

Next, the LED illumination device was turned on, and the angle of the goniometer to which the illumination device was attached was changed every 5 ° from plus 80 ° to minus 80 °, and the luminance was measured in a dark room. When the LED light source of the LED lighting device is directly facing the spectroradiometer, the angle of the goniometer is adjusted to 0, and the angle of the goniometer is changed counterclockwise when the measurement system is viewed from above. Is defined as plus, and the radiation angle changed clockwise is defined as minus. Then, the relative luminance with the highest luminance value of 1 in the measurement value group in which the radiation angle was changed was plotted on the vertical axis, and the goniometer angle (radiation angle) was plotted on the horizontal axis.

<Example 1>
Using a polycarbonate film having a thickness of 150 μm, a prism sheet in which triangular pyramid prisms are closely packed and arranged under the conditions described in Example 1 of US Pat. No. 6,318,866 was produced. Specifically, first, on a 100 mm square brass plate whose surface is cut flat, using a diamond bite, the repetition pitch is 210.88 μm in the y direction and the z direction, and the depth is 100 μm. A method of fly-cutting a large number of V-shaped parallel grooves having symmetrical cross-sections in each of the y direction and the z direction so that the crossing angle between the y direction and the z direction is 58.76 °. Cut by. Next, a V-shaped groove in the x direction is a straight line connecting two intersections of the groove in the y direction and the groove in the z direction, using a diamond bite, having a repetition pitch of 214.92 μm and a depth of 115 μm. In parallel, the V-shaped parallel groove group whose cross-sectional shape is symmetric in the x direction was cut in a repeated pattern so that the offset amount from the straight line was 11 μm. Thus, a mother mold was formed in which a large number of convex triangular pyramidal cube corner element groups were arranged in a close-packed manner on a brass plate. The triangular-pyramidal retroreflective element had an optical axis tilt angle (θ) of + 1 °, and the apex angles of the three side surfaces constituting the reflective element were 90 °. Next, a concave cube corner molding die having an inverted shape was created by using this brass mother die. Next, using this molding die, a polycarbonate resin sheet having a thickness of 150 μm is molded, and a large number of triangular pyramid retroreflective elements having a thickness of about 100 μm are arranged on the surface in a close-packed manner. A triangular pyramid cube corner prism sheet was created.

Then, in the optical axis direction of the LED module, the distance between the outer peripheral surface of the protective cover and the prism of the prism sheet is 20 mm, and the distance from the prism to the light emitting part of the LED module is 0.5 mm. And it installed in the protective cover of the LED lighting apparatus similar to the comparative example 1, and produced the LED lighting apparatus. At that time, the prism sheet was disposed so as to cover the LED chip and the prism surface of the prism sheet was on the LED chip side.

Next, the luminance was measured in the same manner as in Comparative Example 1. The measurement results are shown in FIG. As shown in FIG. 17, the LED illumination device of this example has a higher relative luminance curve than the LED illumination device of Comparative Example 1, even when the radiation angle is a large angle, and the relative luminance curve changes relative to the radiation angle. The change in brightness was small. From this, it can be seen that, in the lighting device of Example 1, the part where the protective cover shines widens and the point light source diffusibility and the luminance distribution uniformity are improved as compared with the light emitting state of the LED lighting device of Comparative Example 1. It was.

Also, the appearance of the LED lighting device of this example was visually observed. Visual observation is performed by setting the angle of the goniometer to 0 °, fixing the position of the LED lighting device, and the observer from a position 1 m away from the LED lighting device, and appearance from the front, left and right directions, and up and down directions of the LED lighting device. Was observed. It was found that the lighting device of this example was in a substantially uniform light emission state regardless of the brightness of the LED chip arrangement position at any angle. Moreover, the prism did not stand out and showed an excellent appearance.

<Example 2>
Two molds used in Example 1 were prepared. Then, at the time of heat compression molding of the prism sheet, a prism film similar to the prism of the prism sheet of Example 1 is formed on both surfaces by sandwiching a polycarbonate film having a thickness of 150 μm between two molds and performing heat compression molding on both surfaces. A prism sheet arranged in a close packed arrangement was produced. At this time, the element directions of the triangular pyramid prisms on the front surface and the back surface were formed to coincide with each other.

Then, as in Example 1, the prepared prism sheet was installed to produce an LED lighting device, and the luminance was measured in the same manner as in Comparative Example 1. At this time, in the optical axis direction of the LED module, the distance from the prism on the side opposite to the LED module side (protective cover side) of the prism sheet to the outer peripheral surface of the protective cover is 20 mm, and the distance from this prism to the light emitting part of the LED module Was set to 0.5 mm. The measurement results are shown in FIG. 18 together with Comparative Example 1. As shown in FIG. 18, the LED illumination device of this example has a smaller change in relative luminance due to a change in the radiation angle in the relative luminance curve than the LED illumination device of Comparative Example 1. That is, it is adjusted so that light is appropriately irradiated even in a place with a large radiation angle. From this, it was found that the illuminating device of this example had improved point light source diffusibility and luminance distribution uniformity as compared with the light emitting state of the LED illuminating device of Comparative Example 1.

Moreover, when the external appearance of the LED lighting apparatus of a present Example was observed visually similarly to Example 1, the LED lighting apparatus of a present Example was worried about the brightness of the arrangement position of an LED chip in any angle. In other words, it was found that the light emission state was almost uniform and the LED chip installation position appeared brighter than in Example 1. Moreover, the prism did not stand out and showed an excellent appearance.

<Example 3>
The hexagonal cube corner prism is close-packed in the same manner as in Example 1 except that a hexagonal cube corner prism having a 100 μm side retroreflective element as a retroreflective element is used. The arranged prism sheet was produced.

Then, as in Example 1, the prepared prism sheet was installed to produce an LED lighting device, and the luminance was measured in the same manner as in Comparative Example 1. The measurement results are shown in FIG. 19 together with Comparative Example 1. As shown in FIG. 19, the LED illumination device of this example has a smaller change in relative luminance due to a change in the radiation angle in the relative luminance curve than the LED illumination device of Comparative Example 1. That is, it is adjusted so that light is appropriately irradiated even in a place with a large radiation angle. From this, it was found that the illuminating device of this example had improved point light source diffusibility and luminance distribution uniformity as compared with the light emitting state of the LED lighting device of Comparative Example 1.

Moreover, when the external appearance of the LED lighting apparatus of a present Example was confirmed visually similarly to Example 1, the LED lighting apparatus of a present Example is worried about the brightness of the arrangement position of an LED chip in any angle. In other words, it was found that the light emission state was almost uniform, and was almost the same as in Example 1, and the installation position of the LED chip appeared bright. Moreover, the prism did not stand out and showed an excellent appearance.

<Example 4>
On a 150 mm square brass plate with a flat polished surface, a number of parallel V-shaped members with a depth of 14 μm at a pitch of 30 μm laterally by a fly-cut method using a diamond tool with a tip angle of 90 °. The mold groove group Vx was cut. Next, using a diamond tool having a tip angle of 90 ° so as to intersect the V-shaped groove group at an angle of 90 °, a large number of parallel V-shaped groove groups having a depth of 14 μm at a pitch of 30 μm. Vy was cut to produce a mother die on which a large number of convex cross prism element groups were formed. Using this mother mold, a concave mold was produced by electroforming. A prism sheet in which cross prisms are arranged in a close-packed manner was produced in the same manner as in Example 1 except that this mold was used.

Then, as in Example 1, the prepared prism sheet was installed to produce an LED lighting device, and the luminance was measured in the same manner as in Comparative Example 1. The measurement results are shown in FIG. As shown in FIG. 20, the LED lighting device of this example has a smaller change in relative luminance due to the change in the radiation angle in the relative luminance curve than the LED lighting device of Comparative Example 1. That is, it is adjusted so that light is appropriately irradiated even in a place with a large radiation angle. From this, it was found that the illuminating device of Example 4 had improved point light source diffusivity and luminance distribution uniformity as compared with the light emitting state of the conventional LED illuminating device without the prism layer.

Moreover, when the external appearance of the LED lighting apparatus of a present Example was confirmed visually similarly to Example 1, the LED lighting apparatus of a present Example is worried about the brightness of the arrangement position of an LED chip in any angle. In other words, it was found that the light emission state was substantially uniform, and the LED installation position appeared to be bright as much as in Example 1. Moreover, the prism did not stand out and showed an excellent appearance.

<Example 5>
An LED lighting device was produced in the same manner as in Example 4 except that the direction of the prism of the prism sheet was set on the protective cover side, and the luminance was measured in the same manner as in Comparative Example 1. The measurement results are shown in FIG.

As shown in FIG. 21, the LED illumination device of this example has a smaller emission angle in the relative luminance curve than the LED illumination device of Comparative Example 1 at a large angle. For example, when the radiation angle is plus 40 °, the relative luminance of Comparative Example 1 is 0.40, whereas the relative luminance of Example 5 is 0.26, and the difference is as large as 0.14. Further, when compared with the luminance measurement values, the LED illumination device of Comparative Example 1 has a luminance measurement value of 52500 (cd / m 2 ) at a radiation angle of 0 °, whereas the LED illumination device of Example 5 is similar. At the radiation angle, the measured luminance value is 73900 (cd / m 2 ), indicating a high luminance value. From this, it was found that the LED illumination device of this example focused light at an angle with a small radiation angle as compared with the light emission state of the LED illumination device of Comparative Example 1.

Further, when the appearance of the LED lighting device of this example was visually observed in the same manner as in Example 1, the prism did not stand out and showed an excellent appearance.

<Comparative Example 2>
A prism sheet similar to the prism sheet prepared in Example 1 was prepared. Then, a light-transmitting acrylic ester adhesive (trade name: PE-121, manufactured by Nippon Carbide Industries Co., Ltd.) was applied to the inner wall surface of the protective cover of the LED lighting device of Comparative Example 1 with a thickness of 0.5 mm. Then, the prism sheet was adhered to the inner wall surface of the protective cover so that the direction of the prism was on the light source side. Thus, a prism was formed on the inner wall surface of the protective cover. At this time, the distance from the outer peripheral surface of the protective cover to the prism sheet was 1 mm, and the distance from the prism sheet to the LED chip was 19.5 mm. Thereafter, the luminance was measured in the same manner as in Comparative Example 1.

The result is shown in FIG. As shown in FIG. 21, the relative luminance curve of the LED lighting device of this comparative example shows substantially the same behavior as the relative luminance curve of the lighting device of comparative example 1. For example, when the radiation angle is plus 40 °, the relative luminance of Comparative Example 1 is 0.40, whereas the relative luminance of Comparative Example 2 is 0.34, and the difference is as small as 0.06. The LED lighting device of Comparative Example 1 has a luminance of 52500 (cd / m 2 ) when the radiation angle is 0 °, whereas the LED lighting device of Comparative Example 2 has the same radiation as that of Comparative Example 1. In the case of the angle, the measured luminance value is 55700 (cd / m 2 ), which is substantially the same value as in Comparative Example 1, and it was found that the dimming effect could not be obtained so much. In addition, since the prism sheet was integrated with the protective cover, the prism was conspicuous and inferior in appearance as compared with the LED lighting devices of Examples 1 to 5.

As described above, according to the present invention, an LED lighting device capable of easily adjusting a portion to shine is provided, and can be applied to a lighting device having excellent design properties.

DESCRIPTION OF SYMBOLS 1 ... Protective cover 2 ... Base 3 ... LED light source 4 ... Prism sheet 4a, 4b ... Prism layer 4c ... Low refractive index layer 4d, 4e ... Prism layer 5. ..Light diffusing sheet 5a ... Light diffusing layer 11 ... Outer peripheral surface 12 ... Inner peripheral surface 13 ... Fixed convex portion 21 ... Bending portion 22 ... Plate portion 23 ... Holding portion DESCRIPTION OF SYMBOLS 31 ... Board | substrate 32 ... Light emitting element part 33 ... Light emission part 42 ... Prism

Claims (18)

  1. An illumination device comprising at least an LED light source and a light-transmitting protective cover that is placed opposite to the light output portion of the LED light source with an interval from the LED light source,
    The LED lighting device, wherein a prism sheet provided with a prism inside or at least one surface is installed between the LED light source and the protective cover.
  2. The LED lighting device according to claim 1, wherein the prism sheet is provided with the prism only on one surface.
  3. 3. The LED lighting device according to claim 2, wherein the prism sheet is provided on a surface on the LED light source side.
  4. The LED lighting device according to claim 2, wherein the prism sheet is provided on the surface on the protective cover side.
  5. The LED lighting device according to claim 1, wherein the prism sheet is provided with the prism on both sides.
  6. The prism sheet is formed by laminating a plurality of layers having different refractive indexes.
    The LED lighting device according to claim 1, wherein the prism is provided at an interface between two layers stacked on each other.
  7. The LED illumination device according to any one of claims 1 to 6, wherein the protective cover has a cylindrical shape, and the LED light source is installed in a space in the protective cover.
  8. 7. The LED lighting device according to any one of 1 to 6, wherein the protective cover is semi-cylindrical, and the LED light source is installed in a space in the protective cover.
  9. 9. The LED according to claim 1, wherein the prism is any one of a triangular prism linear prism, a linear Fresnel lens, a cross prism, a triangular pyramid prism, a Fresnel lens, and a hexagonal prism. Lighting device.
  10. The LED lighting device according to claim 9, wherein the prism is any one of a cross prism, a triangular pyramid prism, and a hexagonal prism.
  11. 11. The LED lighting device according to claim 1, wherein a light diffusion sheet is installed between the protective cover and the LED light source so as to overlap the prism sheet.
  12. The LED lighting device according to claim 11, wherein a light diffusion sheet is installed between the prism sheet and the protective cover.
  13. The LED illumination device according to claim 11, wherein a light diffusion sheet is installed between the LED light source and the prism sheet.
  14. The LED lighting device according to any one of claims 1 to 10, wherein a light diffusion layer is laminated in the prism sheet.
  15. The LED lighting device according to any one of claims 1 to 10, wherein the prism sheet is made of a light diffusing material.
  16. In the optical axis direction of the LED light source, when the distance from the LED light source to the exit surface of the protective cover is 1, the distance from the LED light source to the prism is 0.5 or less. The LED illumination device according to any one of claims 1 to 15.
  17. In the optical axis direction of the LED light source, when the distance from the LED light source to the exit surface of the protective cover is 1, the distance from the LED light source to the prism is 0.005 to 0.3. The LED illumination device according to claim 16.
  18. In the optical axis direction of the LED light source, when the distance from the LED light source to the exit surface of the protective cover is 1, the distance from the LED light source to the prism is 0.01 to 0.1. The LED lighting device according to claim 17.
PCT/JP2011/075549 2010-11-09 2011-11-07 Led lighting device WO2012063759A1 (en)

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KR1020137011900A KR20130064138A (en) 2010-11-09 2011-11-07 Led lighting device
JP2011075549A JPWO2012063759A1 (en) 2010-11-09 2011-11-07 LED lighting device
CN2011800540343A CN103221736A (en) 2010-11-09 2011-11-07 Led lighting device

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JPWO2012063759A1 (en) 2014-05-12
KR20130064138A (en) 2013-06-17

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