Point light source-oriented light guiding means and lighting unit utilizing the same
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United States of America Patent
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Oct 5, 2004
Grant Date -
May 29, 2003
app pub date -
Sep 30, 2002
filing date -
Oct 1, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A lighting unit for illuminating a liquid crystal panel includes a point light source and a light guide. The light guide includes a first side surface extending in a direction x and having a light incidence portion facing the light source, a second side surface extending in a direction y perpendicular to the direction x, a third side surface spaced from the second side surface in the direction x, and an outlet surface for exit of light. The second side face is formed with a plurality of recesses each including a slant surface for causing light emitted from the light source to be reflected toward the third side surface. The recesses progressively increase in depth as they are positioned farther from the light source.
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Cited Art Landscape
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