Surface light source device with half-ellipse reflecting plate
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United States of America Patent
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Oct 28, 2008
Grant Date -
May 10, 2007
app pub date -
Feb 14, 2006
filing date -
Nov 7, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A reflecting plate in form of dual half-ellipses comprises a first ellipse having a first focal point and a second focal point, and a second ellipse having a first focal point and a second focal point. The first ellipse and the second ellipse commonly share the first focal point. A cross-section of the reflecting plate is designed in such a form that the dual half-ellipses are aligned with each other, and that contours of the first ellipse and the second ellipse are divided by a straight line, which includes the commonly shared first focal point and the other focal points. The reflecting plate encloses the line light source by the dual half-ellipses and reflects a light from the line light source toward the diffusion plate arranged above by specular reflection and by diffused reflection. As a result, uneven brightness is eliminated at the boundary of the reflecting plate designed in form of dual half-ellipses.
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