JP2011076833A - Led lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED lighting device which has a wide light-distributing range while ensuring safety and incombustibility. <P>SOLUTION: An optical cover for diffusing light-emission from an LED chip is set at a double structure of a first internal optical cover 15 and a second external optical cover 16, or a multi-structure of a double layer or more. Different characteristics are given to the internal optical cover 15 and the external optical cover 16, and a material superior on light-diffusion characteristics, shock resistance, and incombustibility is used for at least one of the internal optical cover 15 and the external optical cover 16, thereby achieving the LED lighting device which is superior on safety and incombustibility as a whole lighting fixture and has wide light-distributing range. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an illuminating device, and more particularly, to an LED illuminating device including an LED light source and capable of adjusting a light irradiation range.

  In recent years, with the growing awareness of the environment, lighting power sources with high power consumption, such as incandescent light bulbs that have been used in the past, have been avoided, and as a replacement for incandescent light bulbs, LEDs (Light Emitting Diodes) In many cases, diodes are used. The LED is attracting attention as an environmentally friendly light source because it is excellent in luminous efficiency and does not use mercury like a fluorescent lamp.

JP 2008-103112 A

  The LED is a point light source, is a light source with high directivity, and has a feature of emitting strong light forward. For this reason, in order to disperse light around the entire circumference like a light bulb, a material having high light diffusibility is used as the material of the optical cover, and it is often handled by increasing the height in the height direction.

  In the case of LEDs, it is necessary to increase the size of the housing for heat dissipation, and the optical cover often cannot be as large as necessary for turning light around the entire circumference.

  Furthermore, when safety and flame retardancy are taken into consideration, glass is easy to break, and a resin such as polycarbonate often cannot ensure flame retardancy. When the flame retardant treatment is applied to the polycarbonate resin, the light transmittance is reduced and the cost is increased. Furthermore, although the polycarbonate resin is excellent in light diffusibility, it is deteriorated by ultraviolet rays depending on the use environment, and the transmittance is lowered.

  As a means for controlling light distribution and enabling illumination in all directions, Patent Document 1 discloses a method of arranging a plurality of LEDs in a three-dimensional manner so that illumination light is emitted in all directions. However, in the illumination device described in Patent Document 1, since a considerable number of LEDs are used, the size of the substrate on which the LEDs are mounted increases, and the manufacturing cost increases. Furthermore, it is necessary to dissipate heat only on the substrate on which the LED is mounted, and the substrate size must be further increased.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide an LED lighting device in which light distribution is controlled while ensuring safety and flame retardancy.

  The LED lighting device according to the present invention includes an LED light source in which an LED chip is mounted in a package, a base that supports the LED light source on a main surface, and the LED that is installed on the main surface side of the base. A translucent first optical cover that covers the light source, and a translucent second optical cover that is installed on the main surface side of the base and covers the outside of the first optical cover. This is the first feature.

  Furthermore, in addition to the first feature, the LED lighting device according to the present invention has a second feature that the first optical cover and the second optical cover are different in material or shape.

 Furthermore, in addition to the first or second feature, the LED lighting device according to the present invention has at least one of the first optical cover and the second optical cover having a haze ( A third feature is that (HAZE) is made of a material having a high light diffusion property of 99% or more.

  Further, in addition to any of the first to third features, the LED lighting device according to the present invention includes at least one of the first optical cover and the second optical cover according to UL94 standard. A fourth feature is that a plastic material or glass material having flame retardancy of V-0 or higher is used.

  Further, in the LED lighting device according to the present invention, in addition to any of the first to fourth features, a polycarbonate material is used as the first optical cover, and a glass material is used as the second optical cover. Is the fifth feature.

  Furthermore, in addition to any of the first to fifth features, the LED lighting device according to the present invention has a bonding surface between the second optical cover and the base, the first optical cover and the In a direction perpendicular to the surface of the main surface on which the LED light source is supported, with respect to the joint surface with the base, and away from the side on which the LED light source is supported on the main surface. It is a sixth feature.

  Moreover, the LED lighting device according to the present invention is a light bulb type LED lighting device, and in addition to any of the first to sixth features, a light bulb socket is provided on a side opposite to the main surface of the base. And a base for supplying AC power, a power supply circuit for converting the AC power to DC power and supplying power to the LED chip is provided inside the base. Features.

  According to the present invention, the LED light source is provided with two or more optical covers, and the optical cover has a double structure or a multiple structure, thereby solving the problems related to the above-described conventional technology, thereby achieving flame retardancy and safety. Is ensured and the light distribution is controlled.

  Specifically, for example, as described above, the glass optical cover alone is excellent in flame retardancy, but is easily broken and has a problem in safety. On the other hand, the polycarbonate optical cover alone is excellent in light diffusibility and impact resistance, but has a problem in flame retardancy. In the present invention, the optical cover has a double structure, and at least one of the inner and outer optical covers is made of a material having excellent flame retardancy, and at least one of the inner and outer optical covers is made safe. An LED illumination device that is excellent in both flame retardancy and safety can be realized by being made of an excellent material and having different characteristics (material or shape) for the inner and outer optical covers.

  In addition, since the optical cover has a double structure or multiple structures, the light diffusibility of the entire optical cover can be improved, so that the LED illumination has excellent light distribution controllability and can be illuminated in all directions. A device can be realized.

  Here, haze (HAZE) is used as an index indicating light diffusibility, UL94 standard established and approved by UL (Underwriters Laboratories Inc.) as an index indicating flame retardancy, and has become the de facto industry standard. Is used. The UL94 standard is an index indicating the flame retardancy of plastic, and a test piece of 12.7 mm × 127 mm is vertically (94V-2, 94V-1, 94V-0 and 94-5V) or horizontal (94HB). The result is that the blue flame of the length (20 mm for 94V-0) determined at one end of the test piece is held in contact with the gas burner for two hours (10 seconds for 94V-0) and flame contacted twice. Determine flame retardancy. In particular, in 94V-0, the first burning time is within 5 seconds on average and at most 10 seconds or less, and in the second flame contact where the first flame is performed 10 seconds after the extinguishing, glow extinguishing The time is required to be within 30 seconds. Furthermore, the gauze below 30 cm is required not to ignite.

  In the present invention, at least one of the inner and outer optical covers is made of a material having a haze (HAZE) of 99% or more, that is, a material that diffuses 99% or more of incident light. Is desirable. Thereby, the LED illuminating device which is excellent in light distribution controllability and can perform illumination in all directions can be realized.

  In particular, the inner optical cover (first optical cover) is made of a material excellent in light diffusibility having a haze (HAZE) of 99% or more, thereby suppressing the height of the outer cover, thereby reducing the size of the outer cover. An LED lighting device can be realized.

  In the present invention, it is desirable to use a plastic material or a glass material having a flame retardancy of 94V-0 or higher in accordance with UL94 standard for at least one of the inner and outer optical covers. Thereby, the LED illuminating device which is excellent in a flame retardance as the whole instrument is realizable.

  Among them, by using a polycarbonate material or an acrylic material excellent in light diffusibility as the inner optical cover (first optical cover), and using a flame-retardant glass material as the outer optical cover (second optical cover), An LED lighting device that is excellent in light distribution controllability, flame retardancy, and safety can be realized.

  Further, by using glass having a UV (ultraviolet) cut function as the material of the outer optical cover, it is possible to suppress a decrease in transmittance due to ultraviolet rays of the inner polycarbonate optical cover. Moreover, the shape of the outer optical cover that touches the user's eyes differs from the shape of the inner optical cover by using a glass material that is relatively easy to mold and has a high-class feeling as the material of the outer optical cover. It can be made into a shape with high design.

  Further, according to the LED illumination device of the sixth aspect of the present invention, the LED light source is supported on the joint surface between the outer optical cover base and the joint surface between the inner optical cover and the base. The shape of the base is designed so that it is away from the side where the LED light source is supported on the main surface, and the inner and outer optical covers are placed on the base. Thus, the light distribution range can be widened by adopting a structure in which light diffused by the inner optical cover is distributed through the outer optical cover without being blocked by the base.

  Therefore, according to the present invention, by making the optical cover have a double structure or a multiple structure, it is possible to realize an LED lighting device in which flame retardancy and safety are ensured and light distribution is controlled. In particular, the LED lighting device according to the seventh aspect of the present invention can be used as an LED bulb that can replace an existing incandescent bulb by further providing a base screwed into the bulb socket. As a result, it is possible to provide a small-sized LED bulb in which flame retardancy and safety are ensured and light distribution is controlled.

The structural example of the LED lighting apparatus (LED light bulb) which concerns on 1st Embodiment of this invention is shown. The structural example of the LED lighting apparatus (LED light bulb) which concerns on 2nd Embodiment of this invention is shown. The structural example of the LED lighting apparatus (LED light bulb) which concerns on 3rd Embodiment of this invention is shown.

<First Embodiment>
FIG. 1 shows a configuration example of an LED lighting device 10 according to an embodiment of the present invention (hereinafter referred to as “the present invention device 10” as appropriate). The LED lighting device 10 shown in FIG. 1 is an LED bulb that has a base 11 that is screwed into an existing bulb socket and can be attached and detached. However, the present invention is not limited to this configuration. It is not something that can be done. In the drawings shown below, important parts are appropriately emphasized, and the dimensional ratios of the components shown in the drawings do not necessarily match the actual dimensional ratios.

  An LED light source 14 in which an LED chip is mounted on a package is supported and installed on the main surface 13 of the base 12 at the center of the upper surface of the base 12. The base 12 has a role of radiating heat generated by the light emission of the LED light source 14 to the outside. Moreover, although not shown in figure, the base 12 equips the inside with the power supply circuit for converting the alternating current power supplied from the nozzle | cap | die 11 into direct current power, and supplying electric power to a LED chip. An inner optical cover (first optical cover) 15 and an outer optical cover (second optical cover) 16 are installed on the main surface side of the base 12. For the inner optical cover 15, polycarbonate having excellent light diffusibility is used. In order to diffuse light in all directions, it is desirable that the inner optical cover 15 has a smaller diameter, and the height direction can be reduced by reducing the diameter of the optical cover 15 as much as possible. On the other hand, glass is used for the outer optical cover 16.

  Glass is flame retardant and has high thermal conductivity. Polycarbonate, on the other hand, has a low thermal conductivity and is not a flame retardant compared to glass, but is a material with excellent impact resistance.

  Since the optical cover has a double structure of an inner optical cover 15 made of polycarbonate and an outer optical cover 16 made of glass, the device 10 of the present invention can illuminate in all directions, and illumination The entire device is hard to break, burns and is durable. Furthermore, since the outer optical cover 16 made of glass having a high thermal conductivity also contributes to heat dissipation, heat dissipation is easier compared to a configuration using only polycarbonate.

  Further, when glass having an ultraviolet cut function is used as the outer optical cover 16, deterioration of the polycarbonate in the inner optical cover 15 due to ultraviolet rays can be suppressed, and a decrease in transmittance can be suppressed. In addition, since the glass that is the material of the outer optical cover 16 is relatively easy to mold and is a high-grade material, the outer optical cover that touches the user's eyes may have a highly designable shape. it can.

Second Embodiment
FIG. 2 shows a configuration example of an LED lighting device 20 according to an embodiment of the present invention (hereinafter referred to as “the present invention device 20” as appropriate). As in the first embodiment described above, the LED lighting device 20 shown in FIG. 2 is an LED bulb that has a base 11 that is screwed into an existing bulb socket, and that can be attached and detached. The difference from the first embodiment is that the shape of the base 12 is a divergent shape inclined from the support portion of the central LED light source 14 toward the outer optical cover 16, and the outer optical cover 16. As for the positional relationship between the joint surface with the base and the joint surface with the base of the inner optical cover 15, the joint surface with the base 12 of the outer optical cover 16 is the same as the inner optical cover 15 and the base 12. And a direction perpendicular to the support surface of the LED light source 14 (that is, the axial direction of the light bulb) with respect to the joint surface with the LED, and is configured to move away from the side where the LED light source is supported on the main surface. It is a point.

  Thereby, since the light diffused by the inner optical cover 15 is not blocked by the base 12, the light distribution range can be expanded.

  Here, the outer optical cover 16 has a height that does not contact the inner optical cover 15. Thereby, the light distribution range can be expanded while suppressing the height of the optical cover 16 as much as possible. Furthermore, since the size of the base 12 can be increased by the amount that the height of the optical cover 16 is suppressed, heat dissipation is facilitated.

<Third Embodiment>
FIG. 3 shows a configuration example of an LED lighting device 30 according to an embodiment of the present invention (hereinafter referred to as “the present invention device 30” as appropriate). The LED lighting device 20 shown in FIG. 3 is the present invention device 20 according to the second embodiment described above, in which the height of the outer optical cover 16 is increased, and the outer optical cover 16 is replaced with the inner optical cover. This is an example in which the same material having excellent light diffusibility as that of No. 15 is used.

  In the inventive device 30, the light diffused by the inner optical cover 15 can be diffused again by the outer optical cover 16, so that the light distribution range can be further expanded as compared with the inventive device 20.

  The above-described embodiment is an example of a preferred embodiment of the present invention. The embodiment of the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

  For example, the shape of the main surface 13 of the base on which the LED light source 14 is supported is shown in FIG. 1 as a planar configuration in the first embodiment described above, and in the second and third embodiments described above, Although the structure which is the shape which protruded with respect to the irradiation direction of light was shown in FIG.2 and FIG.3, the main surface 13 can also be a concave structure with respect to the irradiation direction. However, in that case, it is preferable to provide a reflector on the concave main surface and reflect the light blocked by the base 12 toward the optical cover. By making the optical cover into a double structure of the inner optical cover and the outer optical cover, as in the first to third embodiments, flame retardancy and safety are ensured and illumination is possible in all directions. LED lighting device can be realized.

  INDUSTRIAL APPLICABILITY The present invention can be used for an LED lighting device that uses an LED light source for illumination, and in particular, can be used for an LED bulb including a base screwed into a bulb socket.

10: LED lighting apparatus (LED bulb) according to the first embodiment of the present invention
11: Base 12: Base 13: Main surface (support surface of LED light source)
14: LED light source 15: inner optical cover (first optical cover)
16: Outside optical cover (second optical cover)
20: LED lighting device (LED bulb) according to the second embodiment of the present invention
30: LED lighting device (LED bulb) according to a third embodiment of the present invention

Claims (7)

An LED light source in which an LED chip is mounted in a package;
A base for supporting the LED light source on the main surface;
A translucent first optical cover that is installed on the main surface side of the base and covers the LED light source;
An LED illumination apparatus comprising: a translucent second optical cover that is installed on the main surface side of the base and covers an outer side of the first optical cover.   The LED lighting device according to claim 1, wherein the first optical cover and the second optical cover are made of different materials or shapes.   The at least one of the first optical cover and the second optical cover is made of a highly light diffusive material having a haze of 99% or more. Or the LED lighting apparatus of 2.   A plastic material or a glass material having a flame retardancy of 94V-0 or higher according to the UL94 standard is used for at least one of the first optical cover and the second optical cover. Item 4. The LED illumination device according to any one of Items 1 to 3.   5. The LED lighting device according to claim 1, wherein a polycarbonate material is used as the first optical cover, and a glass material is used as the second optical cover.   The bonding surface between the second optical cover and the base is perpendicular to the surface of the main surface on which the LED light source is supported with respect to the bonding surface between the first optical cover and the base. The LED illumination device according to claim 1, wherein the LED illumination device is located on the main surface in a direction away from the side on which the LED light source is supported. On the opposite side of the main surface of the base, a base that is screwed into a light bulb socket and supplies AC power is provided.
The light bulb according to any one of claims 1 to 6, further comprising a power supply circuit for converting the AC power into DC power and supplying power to the LED chip inside the base. Type LED lighting device.

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