Patent Application
20120320591
1. Field of the Invention
The instant disclosure relates to a light bulb; more particularly, to a light bulb using light-emitting diodes (LEDs) as the light sources.
2. Description of Related Art
Although incandescent light bulbs are widely used, they have several disadvantages such as high power consumption, short service life, and low brightness. Whereas the light-emitting diodes (LEDs) are more energy-efficient, have longer useful life, are brighter, and do not have to worry about the tungsten filament been burned out. Therefore, the conventional incandescent light bulbs are gradually being phased out in favor of the LEDs.
However, when in use, the LEDs tend to generate much heat. Thus, how to provide a LED light bulb having high heat dissipation rate is an important topic in today's industry.
To address the above issue, the inventors strive via industrial experience and academic research to present the instant disclosure, which can effectively improve the limitation described above.
The instant disclosure provides a light bulb having improved heat dissipation conducting capability.
The light bulb comprises: a base; a conducting cap disposed on end of the base; a heat-dissipating member disposed on opposite end of the base, where the heat-dissipating member having a wedged structure with multiple outer surfaces; a plurality of LEDs disposed on the wedged structure; and a lamp cover enclosing the wedged structure and the LEDs.
The light bulb of the instant disclosure has the following advantages. The tungsten filament is replaced by LEDs as the light source to be more energy-efficient, have longer service life, and brighter. Moreover, by disposing the LEDs on the inclined surfaces of the wedged structure, heat can be dissipated more quickly by the heat dissipating characteristics of the heat-dissipating member and the heat-transferring properties of the wedged structure. The inclined surfaces also increase the overall heat-dissipating area for enhancing heat dissipation.
In order to further appreciate the characteristics and technical contents of the instant disclosure, references are hereunder made to the detailed descriptions and appended drawings in connection with the instant disclosure. However, the appended drawings are merely shown for exemplary purposes, rather than being used to restrict the scope of the instant disclosure.
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The heat-dissipating member 2 is made of thermally conductive metal material, such as aluminum. Structurally, the heat-dissipating member 2 may be a solid or hollow body. The heat-dissipating member 2 is arranged on the other end, such as the top end as shown in the figures, of the base 4. The heat-dissipating body 2 includes a main body 22 and a wedged structure 21. A plurality of heat-dissipating fins 23 is disposed on the periphery of the main body 22. The wedged structure 21 is formed integrally with the main body 22 in one piece, and a plurality of inclined surfaces 21a are formed adjacently on the wedged structure 21. The end portion, or the tip portion as shown in the figures, of the wedged structure 21 forms a flat surface 21b.
The LEDs 3A are disposed on the inclined surfaces 21a. Each LED 3A has an aluminum substrate 31 and a light-emitting portion 32a. connected thereto. For the instant embodiment, the wedged structure 21 has a quadrilateral pyramid-like body having four inclined surfaces 21a. The quantity of the LED 3A is two, and the two aluminum substrates 31 are arranged on opposite inclined surfaces 21a of the wedged structure 21. Thereby, heat generated by the LEDs 3A can be transferred to the wedged structure 21 via the aluminum substrates 32, and be dissipated by the main body 22 of the heat-dissipating member 2 to achieve excellent heat dissipation.
The lamp cover 1 is disposed on the main body 22 of the heat-dissipating member 2, to enclose the wedged structure 21 and the LEDs 3A. The lamp cover 1 can be ball- or oval-shaped, and be made of transparent glass material or plastic material for frosted light bulb. However, the shape and material of the lamp cover 1 are not restricted. The light rays emitted by the light-emitting portions 32 of the LEDs 3A can penetrate the lamp cover 1 and be projected outwardly.
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Based on the above, the instant disclosure uses the LEDs to replace the tungsten filament as the light source. Thereby, the light bulb is more energy-efficient, has longer service life, and can be brighter. Furthermore, each of the LEDs is disposed on the corresponding surface of the wedged structure, such that heat can be quickly dissipated through the heat-dissipating member and by the heat transferring properties of the wedged structure. Moreover, the multiple surfaces of the wedged structure increase the overall heat-dissipating area, which enhances the heat dissipating rate of the light bulb. In addition, the above embodiments are only for exemplary purposes. The shape of the wedged structure is not restricted, as long as it has a polygonal base with multiple surfaces for mounting the LEDs.
Further still, the LEDs are arranged on different inclined surfaces of the wedged structure in the instant disclosure. Such configuration allows light to be projected toward different directions by the LEDs, which expands the illuminating angle and projecting range of the light bulb. Plus, by further arranging the LED on the flat top surface of the wedged structure, the illuminating angle and projecting range of the light bulb can be further expanded.
The descriptions illustrated supra set forth simply the preferred embodiments of the instant disclosure; however, the characteristics of the instant disclosure are by no means restricted thereto. All changes, alternations, or modifications conveniently considered by those skilled in the art are deemed to be encompassed within the scope of the instant disclosure delineated by the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 100211072 | Jun 2011 | TW | national |
