Patent ID: 9494296
Filing Date: 2016-11-15
CPC Classification: F21K,F21V,F21Y,G02B,G03F

Claim Text:
1. A method of manufacturing a light emitting element of a fluorescent light source, the light emitting element having a fluorescent substrate and a photonic structure on a surface of the fluorescent substrate or a surface of a functional material layer, the functional material layer being formed on the fluorescent substrate, the fluorescent substrate containing a fluorescent material that is excited by an excitation beam, the method comprising: forming a photosensitive material layer on the surface of the fluorescent substrate or the surface of the functional material layer; dividing a single beam emitted from a coherent light source into at least two branch beams; causing the at least two branch beams to cross each other at a predetermined interference angle thereby generating a first interference beam that has a first longitudinal direction; applying an exposure process to the photosensitive material layer with the first interference beam; producing a second interference beam from the at least two branch beams such that the second interference beam has a second longitudinal direction, which crosses the first longitudinal direction of the first interference beam at a first predetermined angle, the second interference beam having the predetermined interference angle; applying the exposure process to the photosensitive material layer with the second interference beam after said applying an exposure process to the photosensitive material layer with the first interference beam; removing those areas of the photosensitive material layer which are irradiated with the first and second interference beams or removing those areas of the photosensitive material layer which are not irradiated with the first and second interference beams, after the exposure process with the first and second interference beams, thereby forming a first fine pattern in the photosensitive material layer; and applying an etching process to the fluorescent substrate or the functional material layer with the first fine pattern of the photosensitive material layer, thereby creating the photonic structure on the surface of the fluorescent substrate or the surface of the functional material layer.