1. Field of the Invention
The present invention relates to a LED lighting device, and more particularly to a LED lighting device with high-low beams.
2. Description of Related Art
A conventional lighting device with high-low beams comprises a light source, a reflector and an adjusting structure. When the conventional lighting device is switched to a high beam mode or a low beam mode, the adjusting structure adjusts a position of the light source relative to the reflector so as to adjust an incident angle of light beams from the light source; as a result, the light beams from the light source can be reflected by the reflector toward a close region or a far region relative to the conventional lighting device.
Another conventional lighting device with high-low beams comprises a light source, a reflector and an adjusting structure. When the conventional lighting device is switched to a high beam mode or a low beam mode, the adjusting structure adjusts an azimuth angle of the reflector relative to the light source so as to adjust an incident angle of light beams from the light source; as a result, the light beams from the light source can be reflected by the reflector toward a close region or a far region relative to the conventional lighting device.
However, the adjusting structure of said conventional lighting device is usually very precise and liable to fault. In addition, the conventional lighting device is complicated and the cost of the conventional lighting device is increased, because of the adjusting structure.
The present invention has arisen to mitigate and/or obviate the disadvantages of the conventional.
The main objective of the present invention is to provide an improved LED lighting device.
To achieve the objective, a LED lighting device with high-low beams comprises a cooling base having an assembling surface defined at a bottom thereof, a first LED chip and a second LED chip assembled on the assembling surface, a gap defined between the first LED chip and the second LED chip, a reflecting member facing the assembling surface, the reflecting member having a high beam reflector and a low beam reflector, the high beam reflector and the low beam reflector respectively corresponding to the second LED chip and the first LED chip, and a curvature of the high beam reflector being different from a curvature of the low beam reflector. Wherein, the assembling surface of the cooling base is completely plane; the high beam reflector is closer to the assembling surface than the low beam reflector; the LED lighting device further comprises a lens, and the lens is assembled in front of the high beam reflector of the reflecting member; the lens might be a plano-convex lens, a biconvex lens or a Fresnel lens; the cooling base is made of copper or aluminum.
Under this arrangement, light beams from the second LED chip are reflected by the high beam reflector toward a far region relative to the LED lighting device of the present invention; light beams from the first LED chip are reflected by the low beam reflector toward a close region relative to the LED lighting device of the present invention.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
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Under this arrangement, a user can selectively switch the LED lighting device of the present invention to one of the low beam mode and the low beam mode, via selectively turning on one of the second LED chip 3 and the first LED chip 2. Therefore, the adjusting structure of the LED chip or the reflecting member is not necessary for the present invention; the whole structure of the present invention is simpler than that of the conventional LED lighting device.
Furthermore, the assembling surface 11 of the cooling base 1 is completely plane, so that the second LED chip 3 and the first LED chip 2 assembled on the assembling surface 11 are located in the same plane. Therefore, the heat emitted from the first LED chip 2 or the second LED chip 3 would be efficiently transmitted to the outside relative to the LED lighting device of the present invention. The high beam reflector 41 is closer to the assembling surface 11 than the low beam reflector 42. The cooling base 1 is made of a thermal conductive material which is selected from a group consisting of copper and aluminum.
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Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.