JP2007115595A - Lighting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting apparatus which is free from the harm of mercury, long in life, efficient, and easy to be replaced from a fluorescent lamp. <P>SOLUTION: The lighting apparatus 1 comprises a light emitting diode 4, a light transmitting case 3 for housing the light emitting diode 4, an electrode 2 which leads external electric power into the light transmitting case 3, and an internal power source 6 which converts a current voltage led through the electrode 2 and supplies it to the light emitting diode 4. The light transmitting case 3 is not especially limited in shape, but for example, formed in a cylindrical shape. If the electrodes 2 are formed on both ends of the case 3, the lighting apparatus 1 can be used as a substitute for a straight tube fluorescent lamp. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lighting device using a light emitting diode as a light source. In particular, the present invention relates to an illuminating device that can replace a conventionally used fluorescent lamp.

  Conventionally, a fluorescent lamp is generally used as a home lighting device (see, for example, Patent Document 1). Fluorescent lamps are widely used because they have characteristics such as higher efficiency and longer life than incandescent bulbs.

  However, mercury is used in fluorescent lamps, though in a very small amount. Mercury has been reported to adversely affect the fetus when ingested during pregnancy, and neuropathy has been reported to occur when ingested by the general population. Therefore, in recent years, due to the increased awareness of the environment, it is expected that the RoHS (the Restriction of the Use of Hazardous Substantial in electrical and electrical equipment) Directive will be issued in Europe.

  In addition, fluorescent lamps have a longer lifetime than incandescent bulbs, but their values are not sufficient, about 6000 hours, and often need to be replaced. Nevertheless, it is unlikely that the lifetime of the fluorescent lamp will be significantly improved in the future. In addition, fluorescent lamps are being promoted to be more efficient, but they are also unlikely to be dramatically improved. In other words, it can be said that the improvement of the performance of the fluorescent lamp has reached its limit. In view of such a situation, an illumination device using a light emitting diode as a light source has been proposed.

  For example, in Patent Document 2, a fluorescent tubular body in which a phosphor is coated on the inner surface or the outer surface, an ultraviolet light emitting diode substrate in which a plurality of ultraviolet light emitting elements are arranged on the substrate, and an ultraviolet light emitting diode substrate are placed inside the fluorescent tubular body. An illumination tube is described that includes support means for supporting and lead wires for supplying power to the ultraviolet light emitting element. This makes it possible to provide an illumination device that is easy to manufacture and can withstand long-term use.

  However, the illumination tube of Patent Document 2 supplies external power to the light emitting diode as it is, and has a structure that can be used as it is attached to a fluorescent lamp support provided on the ceiling of the room. Absent. For this reason, the illumination tube of Patent Document 2 is not easily replaced from a fluorescent lamp.

Japanese Patent Laid-Open No. 2004-127631 JP 2002-133910 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lighting device that is free from mercury, has a long life, and is highly efficient. It is another object of the present invention to provide an illumination device that can be easily replaced with a fluorescent lamp.

  The above problems include a light emitting diode, a translucent case for housing the light emitting diode, an electrode unit for introducing external power into the translucent case, and a current voltage introduced from the electrode unit. This is solved by providing an illuminating device comprising an internal power supply for supplying to the light emitting diode.

  As a result, it is possible to supply external light supplied from a commercial power supply or the like to the light emitting diode after being converted by the internal power supply, and the light emitting diode can be driven with an appropriate current voltage. In addition, the light-emitting diode can be protected from dust and moisture by the translucent case.

  Here, the translucent case is not only entirely formed of a material having translucency, but also partially formed of a material having translucency (some have translucency). It is assumed that the concept also includes those formed of no material. The translucent part of the translucent case is usually formed of glass or resin.

In the lighting device, the light-emitting diode is preferably mounted on a substrate formed of a metal having a thermal conductivity at 0 ° C. of 200 W · m ⁻¹ · K ⁻¹ or more. This makes it possible to efficiently release the heat generated from the light emitting diode. Examples of the metal having a thermal conductivity at 0 ° C. of 200 W · m ⁻¹ · K ⁻¹ or more include aluminum (236 W · m ⁻¹ · K ⁻¹ ) and copper (403 W · m ⁻¹ · K ⁻¹ ). Illustrated.

  It is also preferable that the plurality of light emitting diodes are arranged in an array. Moreover, it is also preferable that the translucent case is formed in a cylindrical shape (straight tube) and the electrode portions are provided at both ends of the translucent case. This makes it possible to use the illumination device of the present invention as an alternative to a straight tube fluorescent lamp.

  It is also preferable that a part of the translucent case is made of metal so that heat generated from the light emitting diode is easily released to the outside of the translucent case. Thereby, it becomes possible to prevent a failure of the light emitting diode and the internal power supply.

  It is also preferable that the translucent case includes a diffusing unit for diffusing the light emitted from the light emitting diode. As a result, the light emitted from the light emitting diode can be diffused uniformly and over a wide range.

  The light source color of the light emitting diode is not particularly limited, but it is a daylight color, day white color, white color, warm white color or light bulb defined in 4.2 “Chromaticity range” of JISZ9112 “Classification by light source color and color rendering of fluorescent lamp” A color is preferred. As a result, the chromaticity of the irradiation light can be set to be equivalent to the irradiation light of a general fluorescent lamp.

  The lighting device of the present invention is formed to have the same dimensions as any of the straight tube fluorescent lamps defined in 2.3.1 “List of data sheets” of JIS C7617-2 “Straight tube fluorescent lamps—Part 2: Specification of performance”. However, it is also preferable to be able to replace the straight tube fluorescent lamp. As a result, the lighting device of the present invention can be used as it is attached to a support for a straight tube fluorescent lamp. Therefore, not only the replacement cost can be reduced, but also resources can be used effectively.

  As described above, according to the present invention, it is possible to provide an illumination device that is free from mercury and has a long lifetime and high efficiency. It is also possible to provide an illumination device that can be easily replaced with a fluorescent lamp.

  The lighting device of the present invention will be described more specifically with reference to the drawings. FIG. 1 is an external view showing a first embodiment of a lighting device according to the present invention. FIG. 2 is a cross-sectional view taken along line A-A ′ of the lighting device illustrated in FIG. 1. FIG. 3 is an external view showing a state in which the lighting device shown in FIG. 1 is attached to a support for a straight tube fluorescent lamp.

[First embodiment]
First, the 1st Example of the illuminating device of this invention is described. As shown in FIG. 1, the illumination device 1 according to the first embodiment includes an electrode unit 2 and a translucent case 3. Further, as shown in FIG. 2, the light emitting diode 4, the substrate 5, the internal power supply 6, the diffusion sheet 7 (diffusion means), and the support portion 8 are disposed inside the translucent case 3.

  The electrode unit 2 has the same mechanism and dimensions as those used in a general straight tube fluorescent lamp. Moreover, the outer diameter and length of the translucent case 3 are also the same dimensions as a general straight tube fluorescent lamp. Therefore, the illumination device 1 can be mounted on a general support for a straight tube fluorescent lamp.

  The translucent case 3 is made of transparent glass or acrylic so that the light emitted from the light emitting diode 4 can be transmitted to the outside. Five light emitting diodes 4 are used in the first embodiment. The number of light emitting diodes 4 is not limited to this number, and may be increased or decreased as necessary. The chromaticity of the light emitting diode 4 is suitably white or daylight. In the lighting device 1 of the first embodiment, a so-called high power LED is used as the light emitting diode 4.

  The substrate 5 is made of metal and is fixed to the support portion 8. The substrate 5 is generally made of aluminum. The reason is that it is inexpensive and has relatively good thermal conductivity and good heat dissipation characteristics. For this reason, also in the illuminating device 1 of a 1st Example, the board | substrate 5 formed with aluminum is used.

  However, when the power consumption of the light emitting diode 4 is large and the amount of heat generation becomes a problem, not only the light emission efficiency of the light emitting diode 4 is lowered but also the light emitting diode 4 may break down. In such a case, it is preferable to form the substrate 5 with copper having a thermal conductivity superior to that of aluminum. Thereby, the heat generated from the light-emitting diode 4 can be released more quickly, and the performance and reliability of the lighting device 1 can be improved.

  The internal power supply 6 receives external power introduced from the electrode unit 2 as an input. This external power is for lighting the fluorescent lamp, and of course cannot be used as it is for lighting the light emitting diode 4. Therefore, the internal power source 6 converts the light-emitting diode 4 into a DC current and a DC voltage suitable for lighting.

  The diffusion sheet 7 is used as a diffusion means. The diffusion sheet 7 diffuses the light emitted from the light emitting diode 4. The light emitted from the light emitting diode 4 has strong directivity and can only be irradiated locally. For this reason, by diffusing the light emitted from the light emitting diode 4 with the diffusion sheet 7, the directivity of the light is weakened so that a large area can be irradiated with light uniformly.

  The lighting device 1 of the first embodiment described above can be easily replaced from a straight tube fluorescent lamp as shown in FIG. In the example of FIG. 3, the illumination device 1 is manufactured to have the same dimensions as a 20 W straight tube fluorescent lamp, and is attached to a support 31 for a 20 W straight tube fluorescent lamp.

  The light emission efficiency of the light emitting diode 4 is about 60 lm / W even at present, approaching the light emission efficiency (80 lm / W) of the fluorescent lamp. The luminous efficiency of the light emitting diode 4 is expected to exceed that of a fluorescent lamp in two to three years. For this reason, it can be greatly expected that a lighting device 1 brighter than the fluorescent lamp will appear in the future.

  The life of the light emitting diode 4 is 50000 hours or longer, which is much longer than that of the fluorescent lamp (about 6000 hours). For this reason, the illuminating device 1 can reduce the labor and cost concerning replacement | exchange significantly.

  In addition, mercury is used in fluorescent lamps, although only in trace amounts. In recent years, the use of mercury that adversely affects the nervous system of fetuses and adults has been regulated worldwide due to an increase in environmental awareness (such as the RoHS directive in Europe). On the other hand, the lighting device 1 of the present invention is mercury-free and very environmentally friendly.

[Second Example]
Then, the 2nd Example of the illuminating device of this invention is described. FIG. 4 is an external view showing a second embodiment of the illumination device of the present invention. FIG. 5 is a cross-sectional view of the lighting device BB ′ shown in FIG. FIG. 6 is a view of the substrate shown in FIG. 5 as viewed from above.

  As shown in FIGS. 5 and 6, the illumination device 41 of the second embodiment is different from the illumination device 1 of the first embodiment in that a substrate 51 on which each light emitting diode 4 is mounted is integrally formed. Yes. A plurality of light emitting diodes 4 can be arranged on the array above the substrate 51. With such a configuration, the work of attaching the substrate 51 to the support portion 8 is simplified, and the manufacturing cost can be reduced. It is also possible to transmit heat in the longitudinal direction of the lighting device 41.

  The other parts are substantially the same as those of the lighting device 1 of the first embodiment, and thus the description thereof is omitted.

[Third embodiment]
Then, the 3rd Example of the illuminating device of this invention is described. FIG. 7 is an external view showing a third embodiment of the illumination device of the present invention. 8 is a cross-sectional view taken along the line CC ′ of the lighting device shown in FIG. 9 is a cross-sectional view taken along the line DD ′ of the lighting device shown in FIG.

The illuminating device 71 of the third embodiment is different from the illuminating devices 1 and 41 of the first embodiment and the second embodiment in that the translucent case 72 is composed of a plurality of parts. The translucent case 72 shown in FIGS. 7 to 9 is composed of two parts, a translucent part 81 formed of transparent glass or acrylic, and a metal part 82 (non-translucent part) formed of metal. ). The light transmitting portion 81 is provided in the light emitting direction of the light emitting diode 4.

  Moreover, the metal part 82 is connected with the board | substrate 51 through the metal support part 8 excellent in thermal conductivity, as shown in FIG. For this reason, the heat generated from the light emitting diode 4 reaches the metal part 82 through the support part 8, and is released from the metal part 82 to the outside of the translucent case 72. Therefore, it is easy to prevent a temperature rise of the light emitting diode 4 and it is possible to give a good effect on the brightness and life of the light emitting diode 4.

  The other parts are substantially the same as those of the illumination device 41 of the second embodiment, and thus the description thereof is omitted.

[Others]
In addition, the illuminating device of this invention is not limited to the said Example, It can deform | transform and implement freely within the range which does not deviate from the meaning of this invention. For example, it is also possible to enjoy light illumination by setting the light source color of the light emitting diode 4 to green or blue.

  In addition, by forming the translucent case in an annular shape, it is possible to provide alternative illumination for the annular fluorescent lamp.

  Furthermore, a heat sink for cooling may be attached to the metal part of the translucent case. By doing in this way, exhaust heat can be performed efficiently.

It is the external view which showed the 1st Example of the illuminating device of this invention. It is A-A 'sectional drawing of the illuminating device shown by FIG. It is the external view which showed the state which attached the illuminating device shown by FIG. 1 to the support for straight tube | pipe fluorescent lamps. It is the external view which showed the 2nd Example of the illuminating device of this invention. FIG. 5 is a B-B ′ cross-sectional view of the illumination device shown in FIG. 4. It is the figure which looked at the board | substrate shown by FIG. 5 from upper direction. It is the external view which showed the 3rd Example of the illuminating device of this invention. FIG. 8 is a C-C ′ cross-sectional view of the illumination device shown in FIG. 7. It is D-D 'sectional drawing of the illuminating device shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,41,71 Illuminating device 2 Electrode part 3,72 Translucent case 4 Light emitting diode 5,51 Substrate 6 Internal power supply 7 Diffusion sheet (diffusion means)
8 Supporting part 31 Supporting tool 81 Translucent part 82 Metal part (non-translucent part)

Claims (8)

  A light emitting diode, a translucent case for accommodating the light emitting diode, an electrode portion for introducing external power into the translucent case, and a current voltage introduced from the electrode portion to convert the light emitting diode An illumination device comprising an internal power supply for supplying to The light-emitting device according to claim 1, wherein the light-emitting diode is mounted on a substrate formed of a metal having a thermal conductivity at 0 ° C. of 200 W · m ⁻¹ · K ⁻¹ or more.   The lighting device according to claim 1, wherein the plurality of light emitting diodes are arranged in an array.   The lighting device according to claim 1, wherein the translucent case is formed in a cylindrical shape, and the electrode portions are provided at both ends of the translucent case.   The lighting device according to claim 1, wherein a part of the translucent case is made of metal, and heat generated from the light emitting diode is easily released to the outside of the translucent case.   The illuminating device according to claim 1, wherein the translucent case includes diffusion means for diffusing light emitted from the light emitting diode.   The light source color of the light emitting diode is a daylight color, a neutral white color, a white color, a warm white color, or a light bulb color defined in 4.2 “Chromaticity range” of JISZ9112 “Division by light source color and color rendering of fluorescent lamp” The illumination device according to any one of 1 to 6.   It has the same dimensions as one of the straight tube fluorescent lamps specified in 2.3.1 “List of data sheets” in JISC7617-2 “Straight tube fluorescent lamps-Part 2: Performance specifications” and replaced with straight tube fluorescent lamps. The lighting device according to any one of claims 1 to 7.

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