Patent Application
20110254426
The present invention generally relates to a wide-angle illumination light-emitting diode (LED) light bulb, and more particularly to a wide-angle illumination LED light bulb that provides radiation like light emission similar to the conventional light bulbs.
Light-emitting diodes (LEDs) have been widely used in lightings, such as fluorescent lamp, ceiling lighting, projection light, and light bulb, and shows satisfactory performance in all these applications. However, an LED gives off light only in a predetermined direction. Thus, LEDs have excellent applications in lighting devices that project light in a single direction, such as flash light, projection light, ceiling lighting, and fluorescent lamp. However, the application of LED in a lighting device that gives off radiation-like light emission (wide-angle illumination), such as light bulb, faces more severe challenges than the above discussed LED lighting devices and various problems must be overcome before such an application succeeds.
Reference is now made to
(1) The light emitting from the LED die 73 is subjected to blocking by the circumferential wall 71 and provides only an illumination angle not exceeding 120 degrees. This makes the light bulb of this structure impossible to illuminate a wide-angle range and this is considered the primary drawback of the light bulb of this structure. As shown in
(2) As shown in
The primary objective of the present invention is to provide a wide-angle illumination light-emitting diode (LED) light bulb, which comprises a light base formed of a heat dissipation module having an end to which a circuit board is mounted. One or more high-power LEDs are mounted to the circuit board in a chip-on-board fashion. A global cover is arranged above and covers the LEDs of the light base heat dissipation module. Thus, when the light bulb of the present invention is put into use, since the LEDs are mounted to the circuit board in a chip-on-board (COB) fashion, the angle of illumination of the LEDs is close to 180 degrees. An additional feature is a unique coating formed on an inside surface of the global cover, which help further expanding the angular range of illumination to at least 270 degrees for light emission from the light bulb. The overall brightness realized by the light bulb is such that primary lighting from the bulb can reach a lower portion of the bulb below a horizontal line of the light base, making the lower portion sufficiently illuminated.
In view of the unique arrangement provided by the present invention, the angular range of illumination and lighting uniformization are very similar to the radiating lighting provided by the conventional tungsten-filament light bulb and energy-saving bulbs. The cost of using the LED light bulb of the present invention is high, but the life span is extended. Further, the light bulb of the present invention is better in terms of environmental conservation and emission of brightness. This is one of the major advantages of the present invention.
The foregoing objectives and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.
Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
The following descriptions are exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.
Referring to
The light base heat dissipation module 10 is provided for absorb and transmit heat generated by the LED 30 and to further dissipate the heat.
A global cover 40 is mounted to and covers above the LED 30 of the light base heat dissipation module 10. The global cover 40 has an inside surface 400 that has a spherical curvature, as shown in
Further, to realize uniform reflection of light inside the bulb, the inside surface 400 of the cover 40 may be coated with a reflective material that helps uniformization of light, such as a light guide film, whereby even more uniform brightness can be realized.
In summary, in the operation of the present invention, as shown in
It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.
While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 099111579 | Apr 2010 | TW | national |
