JP2012119185A - Led lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact LED lighting device having a simple structure.SOLUTION: The LED lighting device 1 includes: an approximately rectangular substrate 2; a plurality of LED elements 20 arranged on at least one face of the substrate in a longitudinal direction; and a cover lens 3 having a lens section 31 for diffusing or concentrating light of the LED elements and covering the whole surface at an LED element-prepared side of the substrate 2.

Description

  The present invention relates to an LED lighting device.

  Fluorescent tubes have been used for indirect lighting in stores, homes, etc., and hand lighting for work in factories, etc., but in recent years, LED lighting devices that use LED elements as light sources that are small and consume less power Has attracted attention, and various LED lighting devices have been proposed (for example, Patent Document 1).

  However, since the LED elements emit light in a dot shape and are used in a plurality, and the light from the plurality of LEDs needs to be diverged or condensed by the lens, the conventional LED lighting device has a component such as a lens or a cover. The score was relatively large and the structure was complicated.

JP 2003-59332 A

  An object of the present invention is to provide a compact LED lighting device having a simple structure.

  The present invention includes a rectangular substrate; a plurality of LED elements arranged in a longitudinal direction on at least one surface of the substrate; and a lens unit for diverging or condensing light of the LED elements, and The present invention relates to an LED illuminating device including a cover lens that covers the entire surface of a substrate on the LED element arrangement side.

In the LED lighting device of the present invention, the cover lens has both a cover function and a lens function, and the number of parts can be reduced, so that the structure is simple and compact. As a result, the process of manufacturing and assembling the LED lighting device can be simplified.
By manufacturing the cover lens by the extrusion molding method, the degree of freedom of the cross-sectional shape of the cover lens is improved, the length of the cover lens in the longitudinal direction is not limited, and the resin can be selected according to the required performance, and the injection molding method There is an advantage that it can be manufactured at a lower cost. Furthermore, any functional layer can be formed simultaneously by manufacturing the cover lens by a coextrusion molding method.
The LED lighting device can be manufactured by simply sliding and attaching the cover lens to the substrate on which the LED elements are arranged in advance by connecting the groove of the support column in the cover lens and both ends in the short direction of the substrate by fitting. Therefore, manufacture is easy.
By simply selecting the material or structure of the substrate or the material of the support column, heat dissipation from the back surface can be easily achieved.

It is a schematic sketch of an example of the LED lighting apparatus which concerns on this invention. It is a schematic sketch of an example of the board | substrate with an LED element in the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (modified example of a board | substrate) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (modified example of a cover lens) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (modified example of a cover lens) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (modified example of a cover lens) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (modified example of a cover lens) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (modified example of a cover lens) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (modified example of a cover lens) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (modified example of a cover lens) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (modified example of a cover lens) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (modified example of a cover lens) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (modified example of a support | pillar part) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (modified example of a support | pillar part) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (formation example of a functional layer) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view of an example (formation example of a functional layer) of the LED lighting apparatus which concerns on this invention. It is a general | schematic vertical sectional view which shows the example of attachment of the LED lighting apparatus which concerns on this invention. 1 is a schematic vertical sectional view of an LED illumination device manufactured in Example 1. FIG. 6 is a schematic vertical sectional view of an LED lighting device manufactured in Example 2. FIG.

  The LED lighting device according to the present invention includes a substrate, a plurality of LED elements, and a cover lens. For example, as shown in FIG. 1A, the LED lighting device has a long shape in the longitudinal direction LD. FIG. 1A is a schematic sketch of an example of an LED lighting device according to the present invention, where 1 is an LED lighting device, 2 is a substrate, 20 is an LED element, and 3 is a cover lens. Hereinafter, an LED lighting device according to the present invention will be described in detail with reference to the drawings. In all the drawings, common reference numerals indicate similar members.

  The substrate 2 has a substantially rectangular shape. For example, in FIGS. 1A and 1B, LD indicates the longitudinal direction, SD indicates the short direction, and TD indicates the thickness direction. The dimension in particular of the board | substrate 2 is not restrict | limited, What is necessary is just to be suitably determined according to the number of LED elements determined according to required brightness, and a use. As the substrate 2, a metal plate such as aluminum or copper is optimal in terms of strength and heat dissipation, but a heat conductive resin plate can also be used. Thermally conductive resins include metal powders such as copper powder and aluminum powder, heat conductive fillers such as zinc oxide, alumina, and graphite, and general thermoplastic resins including transparent or translucent thermoplastic resins described later. A substrate can be made by extruding this synthetic resin. In the case of a metal plate, light can be reflected forward, and light can also be diffused by making the surface uneven. The thickness of the substrate 2 is usually 0.4 to 3.2 mm.

  A plurality of LED elements 20 are arranged in the longitudinal direction LD on at least one surface of the substrate 2. Usually, as shown to FIG. 1B, the some LED element 20 is arrange | positioned on the board | substrate 2 via the electric circuit part 21. As shown in FIG. The electric circuit unit 21 is a circuit that supplies a voltage applied from a power source (not shown) through the wiring 23 to the LED element 20 to emit light. Although the electric circuit portion 21 is shown in a plate shape in FIGS. 1A and 1B, the shape is not particularly limited as long as the voltage applied via the wiring 23 can be supplied to the LED element 20. The wiring 23 is normally connected to both ends of the electric circuit portion 21 in the longitudinal direction. For example, when the power source is an AC power source (100 V), the voltage is normally applied to the electric circuit unit 21 via a DC converter (not shown) and the wiring 23.

  As shown in FIG. 2, when the substrate 2 having the fins 25 on the back surface is used, the substrate 2 can further promote heat dissipation. The back surface is a surface opposite to the surface on which the LED elements are disposed. The fins 25 are continuously formed in the longitudinal direction of the substrate 2. As the constituent material of the fin, the same material as the substrate can be exemplified. The lighting device in FIG. 2 is the same as the lighting device in FIG. 1A except that fins are provided on the back surface of the substrate. When a board | substrate consists of heat conductive resin, the board | substrate which has a fin can be manufactured by the extrusion method mentioned later.

  In FIG. 1A and FIG. 1B, the LED elements 20 are arranged in a row and in a plurality of rows at a predetermined interval in the longitudinal direction LD of the substrate, but are not limited thereto. A plurality of rows may be provided. The number and interval of LED elements in the longitudinal direction and the number and interval of columns may be determined as appropriate according to the required brightness.

  The electric circuit unit 21 is a wiring circuit for supplying a voltage to the LED, and a general printed board or a flexible printed board can be used. The thickness in particular of the electric circuit part 21 is not restrict | limited, For example, it is 0.1-3 mm.

  The electric circuit portion 21 and the substrate 2 are fixed with an adhesive or fixed with screws or the like. Usually, an electric insulating layer (not shown) is provided between the electric circuit portion 21 and the substrate 2. However, if an electric insulating layer is already provided on the back surface of the electric circuit portion 21, it is not necessary to further provide an electric insulating layer. . Moreover, you may use the heat conductive sheet which conducts heat effectively from a viewpoint of heat radiation promotion. As the heat conductive sheet, for example, a gel or elastomer sheet filled with a heat conductive filler such as zinc oxide, alumina, or graphite can be used.

  The lengths of the substrate 2 and the electric circuit portion 21 in the longitudinal direction LD are appropriately determined according to the installation purpose and the installation location.

  The LED element 20 is a light emitting diode that emits light in a dot shape, and a commercially available one can be used. Examples of commercially available LED elements include surface-mounted LEDs (manufactured by Nichia Corporation), surface-mounted LEDs (manufactured by Toyoda Gosei), and chip LEDs (manufactured by ROHM).

  The cover lens 3 covers the entire surface of the substrate 2 on the LED element arrangement side while having a lens portion 31 that diverges or condenses the light of the LED element 20.

  The lens unit 31 includes at least one front surface (opposite portion) of the LED element 20 in the cover lens 3 as two surfaces on which the LED element side and the outer surface are not flat. For this reason, the lens part 31 can diverge or condense the light of the LED element 20. If both the LED element side surface and the outer surface constituting the lens part are flat, the lens part cannot diverge or condense the light of the LED element, and does not exhibit the lens function. Therefore, it is necessary to use a lens as a separate member, and the number of parts cannot be reduced.

  Specifically, the cover lens 3 further includes two support columns 32 that support both ends of the lens unit 31 when represented by a vertical cross-sectional shape with respect to the longitudinal direction of the substrate 2. Combined with both ends in the hand direction. As a result, the support column 32 is coupled to both ends of the substrate while supporting both ends of the lens unit 31 on a cross section perpendicular to the longitudinal direction of the substrate 2. In the cover lens 3, the boundary between the lens portion 31 and the support column portion 32 cannot be strictly defined. Here, when the LED lighting device 1 is viewed from the LED element 20 side of the substrate 2, the front surface portion of the cover lens 3 is defined. The lens part 31 is used, and the remaining part of the cover lens 3 that supports the substrate 2 is used as the support part 32. In particular, in FIG. 1A, for the sake of convenience, their approximate boundaries are indicated by broken lines. In the present specification, the vertical cross section means a vertical cross section with respect to the longitudinal direction LD of the substrate 2 unless otherwise specified.

  The method for joining the support 32 and the substrate 2 is not particularly limited. For example, a method using a known adhesive may be adopted, but from the viewpoint of ease of assembly of the LED lighting device, physical connection is possible. It is preferable to employ a bonding method. The physical bonding method is a method in which bonding is physically achieved by fitting a concave portion and a convex portion without using a chemical such as an adhesive. Specifically, for example, when the support column 32 is represented by a vertical cross-sectional shape, a groove 320 is provided on the surface on the LED element 20 side, and the short-side end of the substrate 2 is fitted into the groove 320. To support both ends of the substrate 2 in the short direction.

  The cover lens 3 is an extrusion-molded body provided with a lens portion 31 and a column portion 32. Since the longitudinal direction LD of the substrate 2 is the extrusion direction, the cover lens 3 has the same vertical cross-sectional shape in the longitudinal direction LD of the substrate.

  The extrusion molding method is a method in which a molding material is extruded from a die having a predetermined vertical cross-sectional shape of the cover lens 3 (lens portion 31 and column portion 32) as an extrusion port, so that the lens portion and the column portion are integrated. It is a molding method obtained by making it, and what was formed by such a method is called an extrusion molding. By manufacturing the cover lens 3 by the extrusion molding method, the cover lens 3 can be manufactured as a long product having a free length.

  The material constituting the lens unit 31 and the support column 32 is usually the same material, and specifically includes at least a transparent or translucent thermoplastic resin. Specific examples of transparent or translucent thermoplastic resins include, for example, acrylic ester resins such as polymethyl methacrylate; polycarbonates; acrylonitrile / styrene copolymer resins, polystyrene, methyl methacrylate / styrene copolymer resins, transparent acrylonitrile / butadiene. Styrenic resins such as styrene copolymer resins; cycloolefin resins such as cycloolefin polymers and cycloolefin copolymers can be used.

In addition to the resin, the lens unit 31 and the support column unit 32 may contain an additive such as a light diffusing agent.
The light diffusing agent is a material capable of diffusing transmitted light, and examples thereof include inorganic fine particles such as silica, alumina, titanium oxide, and calcium carbonate, and organic fine particles such as polymethyl methacrylate, polycarbonate, and polystyrene. . The average primary particle size of the light diffusing agent is preferably 0.1 to 100 μm.

  The lens portion 31 and the support column portion 32 have substantially the same length in the longitudinal direction LD as that of the substrate 2 and the like.

Depending on the lens shape of the lens part 31, the light of the LED element can be diverged or / and condensed.
For example, when the lens unit 31 has a concave lens shape, the light of the LED element is diverged. In this specification, the concave lens shape is a shape in which the thickness of the central portion in the short direction of the substrate is thinner than the end portion when the lens portion is represented by a vertical cross-sectional shape, and such a vertical cross-sectional shape. Is a shape maintained in the longitudinal direction of the substrate. Specific examples of the concave lens shape of the lens unit 31 include the shapes shown in FIGS. 1A, 3, and 4. These shapes are also shapes in which a predetermined vertical cross-sectional shape is maintained in the longitudinal direction of the substrate. 3 and 4 are schematic cross-sectional views of an example of the illumination device of the present invention, and are the same as the illumination device 1 of FIG. 1A except that the shape of the cover lens 3 is different.

The lens portion 31 in FIG. 1A has a plano-concave lens shape in which the LED element side surface is concave and the outer surface is flat.
The lens portion 31 in FIG. 3 has a concave meniscus lens shape in which the LED element side surface is concave, the outer surface is convex, and the central portion is thinner than the end portion.
The lens unit 31 in FIG. 4 has a plano-concave lens shape in which the LED element side surface is a flat surface and the outer surface is a concave surface.

  For example, when the lens part 31 has a convex lens shape, the light of an LED element is condensed. In this specification, the convex lens shape is a shape in which the thickness of the central portion in the short direction of the substrate is thicker than the end portion when the lens portion is represented by a vertical cross-sectional shape, and such a vertical cross-sectional shape. Is a shape maintained in the longitudinal direction of the substrate. Specific examples of the convex lens shape of the lens unit 31 include the shapes shown in FIGS. 5A, 5B, and 5C. These shapes are also shapes in which a predetermined vertical cross-sectional shape is maintained in the longitudinal direction of the substrate. 5A, FIG. 5B, and FIG. 5C are all schematic cross-sectional views of an example of the lighting device of the present invention, and are the same as the lighting device 1 of FIG. 1A except that the shape of the cover lens 3 is different. .

The lens portion 31 in FIG. 5A has a plano-convex lens shape in which the surface on the LED element side is a flat surface and the outer surface is a convex surface.
5B and 5C has a plano-convex lens shape in which the LED element side surface is a convex surface and the outer surface is a flat surface.

  In particular, in the plano-convex lens-shaped lens portion 31 shown in FIG. 5C, when the convex portion 311 on the LED element side is represented by a vertical cross-sectional shape, a groove portion 35 is formed at the tip on the LED element side in a triangular shape convex to the LED element side. It has a formed shape. At this time, the board | substrate 2 is arrange | positioned so that the LED element 20 may be accommodated in the said groove part 35. FIG. The groove part 35 is continuously formed in the longitudinal direction of the substrate. In the illuminating device 1 shown in FIG. 5C, the light from the LED element 20 is internally reflected by the inclined surface 310 of the convex portion 311, and thus is focused and projected forward. The length of the groove portion 35 in the longitudinal direction LD is substantially the same as the length of the substrate 2 or the like in the longitudinal direction LD.

  A Fresnel lens shape having a reduced thickness in the lens part shape having a light collecting function can also be employed. For example, the illuminating device 1 shown in FIG. 6 is the same as the illuminating device of FIG. 5B, except that the lens portion 31 of FIG. 5B has a Fresnel lens shape. Even if the lens portion 31 has the Fresnel lens shape, the lens 31 has the same cross-sectional shape in the longitudinal direction of the substrate. FIG. 6 is also a schematic cross-sectional view of an example of the illumination device of the present invention.

  Specific examples of the shape of the lens part 31 that can diverge and collect the light of the LED element include, for example, the shapes shown in FIGS. 7A to 7C. These shapes are also shapes in which a predetermined vertical cross-sectional shape is maintained in the longitudinal direction of the substrate. 7A to 7C are all schematic cross-sectional views of an example of the illumination device of the present invention, and are the same as the illumination device 1 of FIG. 1A except that the shape of the cover lens 3 is different.

When the lens unit 31 shown in FIGS. 7A to 7C is represented by a vertical cross-sectional shape, the thickness regularly changes in the lateral direction of the substrate. In these drawings, the cross-sectional shape is drawn roughly, but by making the shape finer, the light of the LED element is made diffused light.
When the lens unit 31 of FIG. 7A is represented by a vertical cross-sectional shape, the surface on the LED element side is represented by a curve in which a plurality of semicircles convex on the LED element side are continuously arranged in the short-side direction of the substrate, and It has a plane-groove lens shape in which the outer surface is represented by a straight line.
When the lens unit 31 of FIG. 7B is represented by a vertical cross-sectional shape, the surface on the LED element side is represented by a curve in which convex semicircles and concave semicircles are alternately arranged in the lateral direction of the substrate. And the outer surface has a plane-circular corrugated surface lens shape represented by a straight line.
When the lens portion 31 of FIG. 7C is represented by a vertical cross-sectional shape, the surface on the LED element side is represented by a polygonal line in which a plurality of triangles convex on the LED element side are continuously arranged in the short direction of the substrate, and the outer side. These surfaces have a plane-triangular corrugated lens shape represented by a straight line.

  As shown in FIG. 8, when the column portion 32 is represented by a vertical cross-sectional shape, the LED element light can be guided to the back side of the substrate 2 by extending the column portion 32 to the back surface of the substrate 2. This is because the light of the LED element 20 is internally reflected in the lens unit 31 and the column unit 32 and reaches the column unit on the back surface of the substrate 2.

  At this time, the light of the LED element can effectively reach the back side of the substrate by relatively shortening the length of the substrate 2 in the lateral direction of the substrate. Specifically, when expressed in a vertical cross-sectional shape, as shown in FIG. 8, the coupling portion of the support column 32 with both ends in the short direction of the substrate 2 has a protruding portion 321 protruding toward the substrate 2 side. The protrusions 321 are provided with grooves 320 for fitting with both ends of the substrate in the short direction. Thereby, since the board | substrate short direction length of the board | substrate 2 can be made comparatively short, the light of an LED element can be effectively reached to the back surface of a board | substrate. The illuminating device 1 of FIG. 8 is the same as the illuminating device of FIG. 5A except that the shape of the support | pillar part 32 differs.

  The support | pillar part 32 can promote heat dissipation by forming the contact part with the board | substrate 2 with the said heat conductive resin. For example, in FIG. 9, the contact part 322 with the board | substrate 2 in the support | pillar part 32 is formed with a heat conductive resin. The contact portion 322 formed of a heat conductive resin can also have a function as a light shielding layer described later. The illuminating device 1 of FIG. 9 is the same as the illuminating device of FIG. 5A except that the contact portion 322 of the support column 32 with the substrate 2 is formed of a heat conductive resin.

Such a contact portion 322 can be manufactured by a coextrusion molding method simultaneously with the column portion 32 and the lens portion 31 having the contact portion 322.
The co-extrusion method is a method in which members of different materials are simultaneously and integrally extruded. More specifically, different materials are melted and extruded separately, and at the same time, the melts are integrated and molded in a die having a predetermined vertical cross-sectional shape as an extrusion port.

  The LED lighting device 1 of the present invention can have a functional layer on a part or the whole of the outer surface and / or inner surface of the cover lens 3. Specifically, a functional layer can be provided on a part or the whole of the outer surface and / or the inner surface of the lens unit 31 and / or the support column 32. For example, in the LED lighting device 1 of FIG. 10A, the functional layer 5 is formed on a part of the outer surface of the lens unit 31 and the column unit 32. Further, for example, in the LED lighting device 1 of FIG. 10B, the functional layer 5 is formed on the entire inner surface of the lens unit 31, a part of the outer surface of the lens unit 31, and a part of the outer surface of the support column 32. ing. The lighting device 1 in FIG. 10A is the same as the lighting device in FIG. 5A except that the functional layer 5 is provided. The lighting device 1 in FIG. 10B is the same as the lighting device in FIG. 1A except that the functional layer 5 is provided.

  The functional layer is one or more layers selected from the group consisting of a light diffusion layer (frost layer), a light shielding layer, and a decorative layer, and is appropriately selected depending on the surface to be formed. The functional layer may be formed by laminating two or more layers.

  The light diffusing layer is a resin layer having a function of promoting light diffusion, and the light diffusing agent is dispersed in the resin). The light diffusion layer can be formed on a part or the whole of the outer surface and / or the inner surface of the lens unit 31 and / or the support column 32. By providing the light diffusing layer, the spot light of the LED elements will appear blurred, so that the dazzling when the LED lighting device is directly viewed is reduced, and the plurality of shadows caused by the plurality of LEDs are dispersed, Reduced and preferred.

  The light shielding layer is a resin layer having a function of shielding light, and is formed by dispersing an opaque colorant in the resin. As the colorant contained in the light shielding layer, a general colorant for resin can be used. The light shielding layer can be formed on a part of the outer surface and / or inner surface of the lens unit 31 and / or the support column 32.

  The decorative layer is a resin layer formed for the purpose of improving the appearance of the LED lighting device, and examples thereof include a layer having various color patterns such as a wood grain pattern, and a simple colored layer. The decoration layer is formed on a part or the whole of the outer surface of the lens unit 31 and / or the support column 32.

  The functional layer 5 may be affixed by an adhesive or the like, but is preferably manufactured by a coextrusion molding method simultaneously with the cover lens 3 (the column portion 32 and the lens portion 31). By the coextrusion molding method, the cover lens 3 and the functional layer 5 integrated with the cover lens 3 can be manufactured simultaneously.

The assembly (manufacture) and installation of the LED lighting device 1 of the present invention can be achieved, for example, by the following method.
First, the substrate 2 on which the LED elements 20 are arranged is fixed and installed in advance at a target location with screws. Next, the assembly can be achieved by slidingly inserting the cover lens 3 while fitting the grooves 320 of the cover lens 3 to both ends in the vertical cross section of the substrate 2.

  Alternatively, a mounting bracket is used. First, the mounting bracket is fixed in advance to the destination location. On the other hand, the LED lighting device 1 is assembled by slidingly inserting the cover lens 3 while fitting the grooves 320 of the cover lens 3 to both ends in the vertical section of the substrate 2 on which the LED elements 20 are disposed. Next, the LED lighting device 1 is fixed and installed with screws to the fixed mounting bracket. In this case, as shown in FIG. 11, a folded portion 51 that opens outward is provided at the tip so that the mounting bracket 50 is elastically inward in the width direction, and the lens portion 31 in the support column 32 is The LED illumination device 1 is elastically fitted from the front of the mounting bracket by extending the opposite end of the vertical section in the shape of a protrusion 323 on which the folded portion 51 of the mounting bracket 50 is hooked. Can be fixed. The illuminating device 1 in FIG. 11 is the same as the illuminating device in FIG. 1A except that the end portion of the column portion 32 opposite to the lens portion 31 has a shape that the folded portion 51 of the mounting bracket 50 is hooked. In FIG. 11, the mounting bracket 50 does not have to have the same length in the longitudinal direction as that of the substrate 2, and the lighting device 1 may be fixed using the mounting bracket 50 in at least two places in the longitudinal direction. .

  The longitudinal end face of the LED lighting device 1 of the present invention is covered with another end cover (not shown) or the lighting device is embedded in the installation place.

  The LED lighting device 1 of the present invention can be a lighting device having a small width (length in the substrate lateral direction SD) and depth (thickness) from the structural surface. The LED lighting device 1 of the present invention is useful for indirect lighting of shops and homes, hand lighting for work in factories, etc., particularly under-shelf lighting of merchandise display shelves, corridors, stairs, underfoot lighting in other places, etc. Also useful.

  The LED lighting device described above has a plurality of LED elements arranged on one side of the substrate, but a plurality of LED elements are arranged on both sides of the substrate. Also good. That is, according to the present invention, a plurality of LED elements are arranged on one surface of a substrate, and the LED illumination device covers the entire one surface of the substrate on the LED element arrangement side with a cover lens. It also includes an LED lighting device in which elements are disposed on both sides of a substrate and the entire surface of both sides of the substrate is covered with a cover lens. When the entire surface of the substrate is covered with a cover lens, two cover lenses may be used, one covering one surface of the substrate and the other covering the other surface. An integrated cover lens may be used.

Example 1
A cover lens composed of a lens portion 31 and a column portion 32 having a vertical cross-sectional shape shown in FIG. 12 was manufactured integrally with the functional layer 5 by a coextrusion molding method. The functional layer 5 was formed on the entire inner surface of the lens unit 31. The constituent materials of each member were as follows. The length of all members in the cover lens in the longitudinal direction was 1000 mm.
Lens part 31 and support part 32; 100% by weight of polymethyl methacrylate.
Functional layer 5; light diffusion layer; polymethyl methacrylate 95% by weight + silica fine particles (average primary particle size 5 μm) 5% by weight. Thickness 0.5mm.

As shown in FIG. 12, the electric circuit board 21 is fixed on the substrate 2 with an adhesive, and a plurality of LED elements (surface-mounted LEDs; manufactured by Nichia Corporation) are arranged in a row on the electric circuit board. Set up. The substrate 2 and the electric circuit board 21 were fixed with an epoxy resin adhesive. The interval between the LED elements was 15 mm. The constituent materials of each member were as follows. The length in the longitudinal direction of the substrate 2, the electric insulation layer, and the electric circuit board 21 was 1000 mm.
Substrate 2; aluminum plate. Thickness 1.5mm.
Electric circuit board 21; thickness 0.5 mm. Wiring (not shown) was electrically connected to both ends in the longitudinal direction of the electric circuit board 21.

  The cover lens 3 was slid and inserted into the groove 320 of the cover lens (31, 32) while both ends of the substrate with LED elements were fitted to obtain the LED illumination device 1 shown in FIG. A voltage was applied between the wirings from an AC 100V power source via a DC converter. When the LED lighting device 1 was observed from the cover lens 3 side, the point light of the LED elements looked blurry, so that no glare was felt when the LED lighting device was directly viewed.

(Example 2)
A cover lens composed of a lens portion 31 and a column portion 32 having a vertical cross section shown in FIG. 13 was manufactured integrally with the functional layer 5 by a coextrusion molding method. The functional layer 5 was formed on the entire inner surface of the groove 35. The constituent materials of each member were as follows. The length of all members in the cover lens in the longitudinal direction was 1000 mm.
Lens part 31 and support part 32; 100% by weight of polymethyl methacrylate.
Functional layer 5; light diffusion layer; polymethyl methacrylate 95% by weight + silica fine particles (average primary particle size 5 μm) 5% by weight. Thickness 0.5mm.

  The board | substrate 2 with an LED element was obtained by the method similar to Example 1. FIG.

  The cover lens 3 was slid into the groove 320 of the cover lens (31, 32) while fitting both ends of the substrate with the LED element, and the LED lighting device 1 shown in FIG. 13 was obtained. A voltage was applied between the wirings from an AC 100V power source via a DC converter. When the LED illumination device 1 was observed from the cover lens 3 side, the lens portion had a light collecting function. On the other hand, since the point light of the LED element looked blurry, the glare when the LED lighting device was directly viewed was hardly felt.

DESCRIPTION OF SYMBOLS 1: LED illuminating device 2: Board | substrate 3: Cover lens 5: Functional layer 20: LED element 21: Electric circuit part 23: Wiring 25: Fin 31: Lens part 32: Support | pillar part 50: Mounting bracket 51: Folding part 320: Groove 321: Protruding part 322: Contact part with substrate in supporting part 323: Protruding part

Claims (17)

A substantially rectangular substrate;
A plurality of LED elements arranged in a longitudinal direction on at least one surface of the substrate; and a lens unit for diverging or condensing light of the LED elements, and on the LED element arrangement side of the substrate A cover lens covering the entire surface;
LED lighting device comprising:   The cover lens further includes two support portions that support both ends of the lens portion when represented by a vertical cross-sectional shape with respect to the longitudinal direction of the substrate, and the support lenses are coupled to both ends of the substrate in the short direction. LED lighting apparatus of description.   When the column part is represented by a vertical cross-sectional shape with respect to the longitudinal direction of the substrate, a groove is formed on the surface on the LED element side, and by fitting the end of the substrate into the groove, the column direction and the short direction of the substrate The LED lighting device according to claim 2, wherein coupling with both ends is achieved.   When the connecting portion of the support portion with both ends of the substrate in the short direction of the substrate is expressed by a vertical cross-sectional shape with respect to the longitudinal direction of the substrate, it has a protruding portion protruding toward the substrate side, and the protruding portion has both ends in the short direction of the substrate. The LED lighting device according to claim 3, further comprising a groove for fitting with the LED lighting device.   The LED lighting device according to any one of claims 2 to 4, wherein a contact portion of the support portion with the substrate is formed of a heat conductive resin.   The LED lighting device according to any one of claims 1 to 5, wherein the cover lens is an extruded body.   The LED lighting device according to claim 1, wherein the cover lens includes at least a transparent or translucent thermoplastic resin.   The LED illumination device according to claim 1, wherein the lens portion has a concave lens shape.   The LED illumination device according to claim 1, wherein the lens portion has a convex lens shape.   When the lens portion has a plano-convex lens shape in which the surface on the LED element side is a convex surface and the outer surface is a plane, and the convex portion on the LED element side is represented by a vertical cross-sectional shape with respect to the longitudinal direction of the substrate, The LED element side convex triangle shape has a shape in which a groove portion is formed at the tip of the LED element side, and the substrate is disposed so that the LED element is accommodated in the groove portion. The LED lighting apparatus in any one.   When the lens part is represented by a vertical cross-sectional shape with respect to the longitudinal direction of the substrate, the surface on the LED element side is represented by a curve in which a plurality of semicircles convex on the LED element side are continuously arranged in the lateral direction of the substrate, The LED illumination device according to any one of claims 1 to 7, wherein the LED illumination device has a plane-groove lens shape in which an outer surface is represented by a straight line.   When the lens part is represented by a vertical cross-sectional shape with respect to the longitudinal direction of the substrate, the surface on the LED element side is represented by a curve in which convex semicircles and concave semicircles are alternately arranged in the lateral direction of the substrate. The LED illumination device according to claim 1, wherein the LED illumination device has a planar-circular corrugated surface lens shape whose outer surface is represented by a straight line.   When the lens portion is represented by a vertical cross-sectional shape with respect to the longitudinal direction of the substrate, the surface on the LED element side is represented by a broken line in which a plurality of triangles convex on the LED element side are continuously arranged in the substrate short direction, and The LED illumination device according to any one of claims 1 to 7, wherein the LED illumination device has a plane-triangular waveform surface lens shape in which an outer surface is represented by a straight line.   The LED lighting device according to claim 1, wherein the cover lens has a functional layer on a part or the entire surface of the outer surface and / or the inner surface.   The LED lighting device according to claim 14, wherein the functional layer is one or more layers selected from the group consisting of a light diffusion layer, a light shielding layer, and a decoration layer.   The LED lighting device according to claim 14 or 15, wherein the functional layer is manufactured by a coextrusion molding method simultaneously with the cover lens.   The LED lighting device according to claim 1, wherein the substrate has fins on a surface opposite to a surface on which the LED elements are disposed.

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