LIGHT-EMITTING DEVICE USING MOUNTING SUBSTRATE
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United States of America Patent
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May 16, 2016
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Nov 27, 2012
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Abstract
A light-emitting device uses a mounting substrate wherein insulation resistance of a metal substrate having an oxide film formed on the surface thereof is ensured, and light reflectance is improved by preventing a light-reflecting material contained in a reflection layer from diffusing into a surface of the metal substrate. The device includes a metal substrate formed of aluminum material, a surface layer section formed on an upper surface of the metal substrate, blue light-emitting diode elements mounted on the surface layer section through a transparent adhesive, and a light-transmitting resin body containing phosphor that seals the blue light-emitting diode elements. The surface layer section includes an oxide film layer containing an alumite layer and being formed on the upper surface of the metal substrate, a barrier layer formed on the oxide film layer, and a reflection layer formed on the barrier layer and containing silver.
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