Patent ID: 8395725
Filing Date: 2013-03-12
Classification: G02B,G02F,H01L

Abstract:
1. A light emitting module, comprising: a ceramic substrate having a surface; a plurality of metal patterns linearly formed on the surface of the ceramic substrate, each of the metal patterns including a titanium (Ti) layer formed on the surface of the ceramic substrate and a metal layer formed on the titanium layer, which is composed of a metal material containing at least one metal selected from aluminum (Al), silver (Ag), platinum (Pt), and nickel (Ni); and a plurality of white light emitting devices linearly arranged between the metal patterns on the surface of the ceramic substrate, each of the white light emitting devices including a semiconductor light emitting element including first and second electrodes, and a light emitting portion which is excited by light from the semiconductor light emitting element to emit white light, the first and second electrodes being electrically connected to the metal patterns disposed on both sides of the white light emitting device via first and second conductive wires, and the white light emitting devices being connected in series via the metal patterns and the conductive wires, wherein the metal patterns are formed on a portion of 60% or more of an area of the surface of the ceramic substrate, and have a surface roughness in a range of 0.01 μm or more and 0.3 μm or less as arithmetic mean roughness Ra, wherein a reflectance when irradiating light with a wavelength of 550 nm at the surface of the ceramic substrate having the metal patterns is 40% or more, and wherein the white light emitting devices are arranged so that a linear density of the semiconductor light emitting element is in a range of 0.5 piece/cm or more and 9 pieces/cm or less.