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US 6,805,456 B2Granted
Planar light source unit
AssigneeCitizen Electronics Co., Ltd.
InventorDaisaku Okuwaki
Life of this patent
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Abstract
A planar light source unit has a transparent light leading plate and a light source provided opposite to the incidence surface of the lead plate. The light leading plate has a light discharge surface at an upper surface, and a lower plane. A prism is provided in the light leading plate at a position opposite to the light source.
Claims4
A planar light source unit comprising:
- a transparent light leading plate;
- the light leading plate having a light discharge surface at an upper surface, and a lower plane;
- an incidence surface formed at a side of the light leading plate;
- a light source provided opposite to the incidence surface;
- and
- a first prism provided in the light leading plate at a position opposite to the light source;
- the first prism having an isosceles triangular sectional shape, with an apex of the isosceles triangle being directed to the light source.
4 more elements
Dependencies are inferred from the claim text.