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US 4,933,814 AGranted
Planar luminescent device
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorYukiharu Sanai
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AssigneeMitsubishi Denki Kabushiki Kaisha
InventorYukiharu Sanai
Estimating the term…
A planar luminescent device comprising a light source whose luminance distribution exhibits varied luminous intensity from a high level to a low level, a light transmitting plate having a light transmitting property and shaped in a planar form, and a reflecting frame for enclosing the light source in cooperation with the surface of a printed board to which the light source is attached and the end face of the light transmitting plate and also holding the light transmitting plate having its end faces on which the light from the light source does not impinge in close contact therewith, in which a portion on an end face of the light transmitting plate is disposed closest to the position where the luminance of the light source is at the low level and incident light on the end face is adapted to be scatteringly reflected by a scattering reflection layer disposed on the back face of the light transmitting plate and radiated from the surface of the same.
A planar luminescent device comprising a light source whose luminance distribution exhibits varied luminous intensity from a high level to a low level and a light transmitting plate having a light transmitting property and shaped in a planar form, wherein a portion on an end face of said light transmitting plate is disposed closest to a position where the luminance of said light source is at the low level and incident light on said end face is adapted to be scatteringly reflected by a scattering reflection layer disposed on a back face of said light transmitting plate and radiated from a surface opposite said back face of said light transmitting plate.
Dependencies are inferred from the claim text.