Light emitting device
AssigneeNichia Corporation
InventorMotokazu Yamada
Life of this patent
Estimating the term…
Abstract
A light emitting device includes a base having a light reflecting surface and having a first side on which the light reflecting surface is provided, light sources mounted on the first side, and a half mirror disposed opposite to the base to reflect a part of incident light and to transmit another part of the incident light. Each of the light sources includes a reflecting layer on an upper surface of each of the light sources. The half mirror has an oblique reflectance with respect to wavelengths of light emitted from the light sources in a case where the light travels obliquely toward the half mirror. The half mirror has a perpendicular reflectance with respect to the wavelengths in a case where the light travels perpendicularly toward the half mirror. The oblique reflectance is smaller than the perpendicular reflectance.
Claims20
A light emitting device comprising:
- a base having a light reflecting surface and having a first side on which the light reflecting surface is provided;
- light sources mounted on the first side of the base;
- a sheet to reflect a part of incident light and to transmit another part of the incident light, the sheet being disposed such that the light sources are provided between the sheet and the base;
- a wavelength converting member to absorb light emitted from each of the light sources and to emit light having a wavelength different from a wavelength of the light emitted from each of the light sources, the wavelength converting member being disposed such that the sheet is provided between the light sources and the wavelength converting member;
- and
- a dichroic layer having a light reflectance higher for a wavelength range converted by the wavelength converting member than for a light emission wavelength of the light source, the dichroic layer being disposed between the wavelength converting member and the sheet.
Dependencies are inferred from the claim text.