Surface light source
AssigneeKabushiki Kaisha Toshiba
InventorKen Sugiyama
Life of this patent
Estimating the term…
Abstract
A surface light source includes concave lens portions 21 provided opposite to light emitting diodes 16. The concave lens portions refract or align point light L1 from the diodes 16. The refracted light is transformed to linear one L2 by a light guide pipe 18. The linear light L2 is also transformed to surface one L3 by a light guide plate 6. Due to refraction or alignment by the concave lens portions 21, the point light L1 from the diodes 16 is efficiently transformed to the linear light L2. Thus, the surface light source is capable of improving the brightness of surface light L3 transformed by the light guide plate.
Claims6
A surface light source comprising:
- a point light source to illuminate point light;
- a first light transforming member to transform said point light to linear light;
- and
- a second light transforming member to transform said linear light to surface one;
- wherein said first light transforming member includes a lens provided opposite to said point light source to distribute the point light to said first light transforming member, and
- said second light transforming member is plate-like in shape.
Dependencies are inferred from the claim text.