Light emitting apparatus
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[0016]Referring to FIG. 2, a light emitting apparatus 2 according to a first embodiment of the invention includes a substrate 20, a first insulating layer 21, a connecting layer 26, a first metal layer 23, at least one light emitting device 22 and a protective layer 29.
[0017]In this embodiment, the material of the substrate 20 may be composed of copper, aluminum, magnesium, titanium or alloys thereof so as to provide a better thermal conductive effect. Alternatively, the material of the substrate 20 may be a ceramic material to provide a better thermal conductivity. The surface of the substrate 20 is formed with a structure 201 for increasing light emitting efficiency.
[0018]In this embodiment, the first insulating layer 21 is disposed at a predetermined position of the substrate 20 and may be formed by patterning the insulating layer 21 with a yellow photolithography process or a screen printing process, such that the structure 201 of the substrate 20 is partially exposed. The insulati
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[0024]In addition, the invention provides the second embodiment, shown in FIG. 3, in which the light emitting apparatus 2 includes a second insulating layer 21′ disposed out of the structure 201 of the substrate 20. Similarly, the insulating layer 21′ may be formed by patterning the insulating layer 21 by, for example, yellow photolithography or screen printing. The material of the insulating layer 21 may be aluminum oxide, magnesium oxide, titanium oxide, aluminum nitride, magnesium nitride, titanium nitride, aluminum carbide, magnesium carbide, titanium carbide, or their combinations, and may be deposited by oxidizing, nitridizing or carbidizing the surface of the substrate or by way of evaporating, sputtering or chemical vapor deposition (CVD) on the substrate 20. That is, when the material of the substrate 20 is selected from at least one of aluminum, magnesium, titanium and alloys thereof, the insulating layer 21′ may be formed by oxidizing, nitridizing or carbidizing the surface
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