Backlighting device
First Claim
1. A backlighting device comprising:
- a light conducting plate made of a transparent material and having at least one of a light diffusing and a light scattering function;
a rod-shaped light source disposed in proximity to at least one side face of the light conducting plate; and
a reflector surface covering the rod-shaped light source, at least part of the reflector surface being a continuous body having a shape which reflects a ray that is emitted from a light emitting point on a surface of the rod-shaped light source in a tangential direction going away from the light conducting plate back to a vicinity of the light emitting point in a plane perpendicular to a central axis of the rod-shaped light source, the continuous body of the reflector surface being formed in such a region that after being reflected back to the vicinity of the light emitting point on the surface of the rod-shaped light source, the ray does not directly reach a light entrance surface of the light conducting plate.
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Accused Products
Abstract
At least part of a reflector surface covering a rod-shaped light source is a continuous body having such a shape that in a plane perpendicular to the central axis of the rod-shaped light source, a ray emitted from a light emitting point on the surface of the rod-shaped light source in the tangential direction going away from a light conducting plate is reflected back to the vicinity of the light emitting point. According to another aspect, at least part of a reflector surface covering a rod-shaped light source located between the rod-shaped light source and the light conducting plate is part of a parabola whose focus is substantially located on the side face of the light conducting plate in a plane perpendicular to the central axis of the rod-shaped light source.
79 Citations
12 Claims
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1. A backlighting device comprising:
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a light conducting plate made of a transparent material and having at least one of a light diffusing and a light scattering function; a rod-shaped light source disposed in proximity to at least one side face of the light conducting plate; and a reflector surface covering the rod-shaped light source, at least part of the reflector surface being a continuous body having a shape which reflects a ray that is emitted from a light emitting point on a surface of the rod-shaped light source in a tangential direction going away from the light conducting plate back to a vicinity of the light emitting point in a plane perpendicular to a central axis of the rod-shaped light source, the continuous body of the reflector surface being formed in such a region that after being reflected back to the vicinity of the light emitting point on the surface of the rod-shaped light source, the ray does not directly reach a light entrance surface of the light conducting plate. - View Dependent Claims (8, 9, 10, 11, 12)
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2. A backlighting device comprising:
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a light conducting plate made of a transparent material and having at least one of a light diffusing and a light scattering function; a rod-shaped light source disposed in proximity to at least one side face of the light conducting plate; and a reflector surface covering the rod-shaped light source, at least part of the reflector surface corresponding to a region between the rod-shaped light source and the light conducting plate being part of a parabola having a focus that is substantially located on the side face of the light conducting plate in a plane perpendicular to a central axis of the rod-shaped light source. - View Dependent Claims (3, 4, 5, 6, 7)
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Specification