Patent Application
20070295972
Certain terms are used throughout the following description and claims to refer to particular system components. As one skilled in the art will appreciate, consumer electronic equipment manufacturers may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not function. In the following discussion and in the claims, the terms “including” and “comprising” are used in an open-ended fashion, and thus should be interpreted to mean “including, but not limited to . . . ” The terms “couple” and “couples” are intended to mean either an indirect or a direct electrical connection. Thus, if a first device couples to a second device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.
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The lenses 38 disposed on the light emitting diodes 34 are composed of transparent materials including epoxy or silicone, in which each lens 38 may include a convex surface 40 or a concave surface (not shown). According to the preferred embodiment of the present invention, each curved surface 40 can have a same or different curvature radius, in which the height of each lens 38 is less than the curvature radius of each curved surface 40. For instance, if the length of each side of the light emitting diode module 30 is 5.6 microns, and the curvature radius of the curved surface 40 is 20 microns, the height of the lens 38 will be 1.2 microns.
The top of each lens 38 also includes a cavity 42, in which the cavity 42 is formed on each curved surface 40 and corresponding to each light emitting diode 34. In the present embodiment, the cavity 42 is a reversed cone structure, in which the vertex angle of the reversed cone structure includes a range between 150 degrees to 180 degrees. However, each reversed cone structure may also include a different vertex angle, which is also within the scope of the present invention.
As shown in the figure, the present invention primarily disposes a plurality of lenses 38 on the light emitting diodes 34, in which the curved surface 40 of each lens 38 is disposed corresponding to each of the light emitting diodes 34. Nevertheless, the present invention can also dispose a compound lens (not shown) having a plurality of sub-lenses directly on the light emitting diodes 34, such that each sub-lens of the compound lens is placed corresponding to each light emitting diode, thereby achieving the same effect as the aforementioned method.
It should be noted that the inclined angle of the sidewall of each lens could be adjusted to control the dispersion and gathering of lights emitting at large angles, and the curved surface and the reversed cone structure of each lens can be utilized to optimize and control the dispersion of lights emitting at small angles according to different properties of each light emitting diode. In other words, the present invention is able to utilize the curvature variation of each curved surface and the reversed cone structure disposed on each curved surface to extend the candela distribution and expand the viewing angle of the light emitting diodes, thereby preventing the conventional problem of bright spots.
Please refer to
The lenses 58 disposed on the light emitting diodes 54 are composed of transparent materials including epoxy or silicone, in which each lens 58 may include a convex surface 60 or a concave surface (not shown). According to the preferred embodiment of the present invention, each curved surface 60 can have a same or different curvature radius, in which the height of each lens 58 is less than the curvature radius of each curved surface 60.
The top of each lens 58 also includes a cavity 62, in which the cavity 62 is formed on each curved surface 50 and corresponding to each light emitting diode 54. In the present embodiment, the cavity 62 is a reversed cone structure, in which the vertex angle of the reversed cone structure includes a range between 150 degrees to 180 degrees. However, each reversed cone structure may also include a different vertex angle, which is also within the scope of the present invention.
Similar to the previous embodiment, the present embodiment principally disposes a plurality of lenses 58 on the light emitting diodes 54, in which the curved surface 60 of each lens 58 is disposed corresponding to each of the light emitting diodes 54. Additionally, the present invention can dispose a compound lens (not shown) having a plurality of sub-lenses directly on the light emitting diodes 54, such that each sub-lens of the compound lens is placed corresponding to each light emitting diode, thereby achieving the same effect as the aforementioned method.
In contrast to the previous embodiment, each lens 58 further includes at least one inclined sidewall 64, in which an included angle φ formed between the surface of the substrate 52 and the inclined sidewall 64 includes a range between 20 degrees to 90 degrees. Hence, the present embodiment not only utilizes the curved surface 60 and the reversed cone structure to adjust the candela distribution of light emitting diodes having different properties, but also utilizes the inclined sidewalls 64 to create more angular variation for different light emitting diodes, thereby maximizing the distribution and gathering of lights emitting at large angles.
Please refer to
The lenses 88 disposed on the light emitting diodes 84 are composed of transparent materials including epoxy or silicone, in which each lens 88 may include a convex surface 90 or a concave surface (not shown). According to the preferred embodiment of the present invention, each curved surface 90 can have a same or different curvature radius, in which the height of each lens 88 is less than the curvature radius of each curved surface 90.
The top of each lens 88 also includes a cavity 92, in which the cavity 92 is formed on each curved surface 90 and corresponding to each light emitting diode 84. In the present embodiment, the cavity 92 is a reversed cone structure, in which the vertex angle of the reversed cone structure includes a range between 150 degrees to 180 degrees. However, each reversed cone structure may also include a different vertex angle, which is also within the scope of the present invention.
Similar to the previous embodiment, the present embodiment principally disposes a plurality of lenses 88 on the light emitting diodes 84, in which the curved surface 90 of each lens 88 is disposed corresponding to each of the light emitting diodes 84. Additionally, the present invention can dispose a compound lens (not shown) having a plurality of sub-lenses directly on the light emitting diodes 84, such that each sub-lens of the compound lens is placed corresponding to each light emitting diode, thereby achieving the same effect as the aforementioned method.
In contrast to the previous embodiment, each lens 88 of the present embodiment not only includes at least one inclined sidewall 94, but also a vertical sidewall 96 connected to the inclined sidewall 94 and the top of the lens 88, in which an included angle φ formed between the surface of the substrate 82 and the inclined sidewall 94 has a range between 20 degrees to 90 degrees. Hence, the present embodiment not only utilizes the curved surface 90 and the reversed cone structure of each lens 88 to adjust the candela distribution of light emitting diodes having different properties, but also utilizes the inclined sidewalls 94 and the vertical sidewall 96 to create more angular variation for different light emitting diodes, thereby maximizing the distribution and gathering of lights emitting at large angles.
In contrast to the conventional light emitting diode modules, the present invention disposes a corresponding lens on top of each light emitting diode, and adjusts the curvature variation of each curved surface of the lens and the inclined angle of each sidewall of the lens to control and collect lights emitting at large angle from the light emitting diodes. The present invention also utilizes the vertex variation of the reversed cone structure disposed on the curved surface of each lens to effectively disperse the stronger lights produced by the light emitting diodes, thereby preventing lights from concentrating in the central area of the lens and preventing the problem of bright spots. In other words, by adjusting the curved surface, inclined sidewall, and reversed cone structure of each lens, the present invention is able to significantly extend the candela distribution and expand the viewing angle of the light emitting diodes, and increase the distance between each of the light emitting diodes, thereby reducing the amount of light emitting diodes utilized in a light emitting diode module and the overall fabrication cost. Additionally, the curved surface and the vertex of the reversed cone structure can be further adjusted according to the property of each light emitting diode. Moreover, in contrast to the conventional design of utilizing a single lens for a plurality of light emitting diodes, each lens of the present invention is specifically designed for each of the light emitting diodes. Ultimately, the uniformity, energy distribution and the mixing ability of the light emitting diode module can be significantly enhanced.
Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 095123131 | Jun 2006 | TW | national |
