Light emitting device provided with lens for controlling light distribution characteristic

摘要

The light emitting device comprises a substrate (2), a positive electrode (6) and a negative electrode (4) formed on the substrate (2), a light emitting diode (8) connected to the positive electrode (6) and the negative electrode (4), the transparent resin (12 and 14) that covers the light emitting diode (8), a fluorescent material (16) that absorbs at least part of light emitted by the light emitting diode (8) and converts it to light of longer wavelength, and the lens that changes the direction of light emission from the light emitting diode (8) and/or the fluorescent material (16). The resin (12 and 14) includes the fluorescent material (16) and is formed so as to constitute the lens of substantially semi-cylindrical shape, and the fluorescent material (16) included in the resin (12 and 14) is distributed with a higher concentration in a region near the surface of the light emitting diode (8) than in a region near the surface of the portion that constitutes the lens.

主权项

1. A method for forming a light emitting device, said method comprising:
forming a first transparent resin such that the first transparent resin covers one or more light emitting diodes mounted on a flat substrate, the first transparent resin having
a height measured from the flat substrate, to a top of the first transparent resin above one light emitting diode of the one or more light emitting diodes, andthe first transparent resin including a fluorescent material;
forming a second transparent resin so as to cover the first transparent resin, the second transparent resin having:
a first height measured from the flat substrate, to a top of the second transparent resin above one light emitting diode of the one or more light emitting diodes,a second height measured from the flat substrate, to another top of the second transparent resin not located over the light emitting diode, wherein said second height is a height of a portion of the second transparent resin having a flat upper surface, andthe first height is larger than the second height of the second transparent resin, andthe height of the first transparent resin is larger than the second height of the second transparent resin; and cutting through the flat substrate and the second transparent resin, to obtain a light emitting device.