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US 7,458,713 B2Granted
Illumination device and light guide plate
AssigneeSeiko Epson Corporation
InventorYasunori Onishi
Life of this patent
Estimating the term…
Abstract
An illumination device includes a light guide plate having an incident end face and a reflecting surface, and a plurality of light sources provided at the incident end face of the light guide plate. The reflecting surface of the light guide plate has a diffusing pattern for diffusing incident light, the diffusing pattern has a plurality of ridgelines arranged perpendicularly to a propagating direction of the incident light to diffuse the incident light, and the ridgelines are discontinuous in the propagating direction.
Claims9
An illumination device comprising:
- a light guide plate having:
- an incident end face;
- an end face opposite the incident end face;
- an emergent surface extending from the incident end face to the end face;
- and
- a reflecting surface opposite the emergent surface and extending from the incident end face to the end face;
- and
- at least one light source provided at the incident end face of the light guide plate;
- the reflecting surface of the light guide plate including at least one of:
- concave portions arranged in rows juxtaposed to one another in a first direction parallel to the incident end face, each of the concave portions being elongated in a second direction that is perpendicular to the incident end face, concave portions in the same row being spaced apart from each other in the second direction, concave portions in adjacent rows being offset from each other in the second direction;
- and
- convex portions arranged in rows juxtaposed to one another in a first direction parallel to the incident end face, each of the convex portions being elongated in a second direction that is perpendicular to the incident end face, convex portions in the same row being spaced apart from each other in the second direction, convex portions in adjacent rows being offset from each other in the second direction.
9 more elements
Dependencies are inferred from the claim text.