Light guide plate and surface-lighting device
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsMorimasa Kuge, Takanori Kritoshi, Osami Oogushi, Hideyuki Tanaka
Life of this patent
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Abstract
A light guide plate includes an incidence surface and an output surface. The incidence surface is an end surface on which light emitted from a light source is incident. The output surface is a surface from which incident light coming from the incidence surface is outputted, and is a plane orthogonal to a thickness direction. The incidence surface is at least partially curved toward the light source, when viewed in a cross-section cut along a plane parallel to both a thickness direction of the light guide plate and an arrangement direction in which the light source and the light guide plate are arranged.
Claims7
A light guide plate, comprising:
- an incidence surface that is an end surface on which light from a light source is incident;
- and
- an output surface that is a surface from which incident light coming from the incidence surface is outputted, the output surface being a plane orthogonal to a thickness direction,
- wherein the incidence surface is at least partially curved toward the light source, when viewed in a cross-section cut along a plane parallel to both a thickness direction of the light guide plate and an arrangement direction in which the light source and the light guide plate are arranged,
- wherein an end surface opposite to the incidence surface is provided with a reflective surface that reflects incident light coming from the incidence surface toward inside of the light guide plate,
- wherein in the cross-section view, the reflective surface is at least partially curved toward a side opposite to the incidence surface, and
- wherein the reflective surface is provided with one of a reflection plate and a reflection sheet that is capable of reflecting light incident thereon from the inside of the light guide plate.
A surface-lighting device, comprising:
- a light guide plate including an incidence surface that is an end surface on which light from a light source is incident;
- and an output surface that is a surface from which incident light coming from the incidence surface is outputted, the output surface being a plane orthogonal to a thickness direction, wherein the incidence surface is at least partially curved toward the light source, when viewed in a cross-section cut along a plane parallel to both a thickness direction of the light guide plate and an arrangement direction in which the light source and the light guide plate are arranged;
- and
- a light source emitting light to the incidence surface of the light guide plate,
- wherein an end surface opposite to the incidence surface is provided with a reflective surface that reflects incident light coming from the incidence surface toward inside of the light guide plate,
- wherein in the cross-section view, the reflective surface is at least partially curved toward a side opposite to the incidence surface, and
- wherein the reflective surface is provided with one of a reflection plate and a reflection sheet that is capable of reflecting light incident thereon from the inside of the light guide plate.
Dependencies are inferred from the claim text.