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US 8,408,752 B2Granted
Surface lighting unit, surface lighting light source device, surface lighting device
AssigneeOPTO Design, Inc.
InventorsEiichi Sato, Kenji Fukuoka
Life of this patent
Estimating the term…
Abstract
In a surface lighting unit comprising a footprint portion, a sidewall portion, and an optical reflector with an opening spaced apart by a predetermined distance from the footprint portion. The opening substantially satisfies a relation A=bx2+c, assuming A is the open area ratio, i.e. the ratio of the opening area in a preset predetermined region to the area of the preset predetermined region, b and c are constants, and x is the distance from the center of the optical reflector. The opening has a circular non-through hole concentric to the center of the optical reflector, a concentric arcuate hole on the outside thereof, and a plurality of round holes farther on the outside thereof.
Claims4
A surface lighting unit plurally arranged in a matrix on a single plane, the unit comprising:
- a box-shaped casing having a footprint portion in which a hole for placing a highly directional point-light source is formed at the center thereof and sidewall portions standing from the footprint portion;
- and
- an optical reflector spaced apart by a certain distance from the footprint portion and having openings, wherein
- the surface lighting unit is used in such a manner that the point-light source is placed in the hole,
- inner surfaces of the footprint portion and of the sidewall portions, and an inner surface of the optical reflector that faces the footprint portion are reflective surfaces,
- the optical reflector has a center thereof facing the hole,
- the openings are so formed that an opening ratio represented by a ratio of the area of the openings in a preset region on the optical reflector to the area of the preset region increases as a distance from the center of the optical reflector increases outward, and
- the sidewall portions have sidewall holes formed to satisfy the opening ratio, and
- wherein the openings are formed in a non-through hole around the center of the optical reflector, in a plurality of non-continuous arcuate holes on the outer side of the non-through hole, and in a plurality of through holes on the outer side of the arcuate holes.
6 more elements
A surface lighting light source device comprising:
- a surface lighting unit plurally arranged in a matrix on a single plane, the unit including:
- a box-shaped casing having a footprint portion in which a hole for placing a highly directional point-light source is formed at the center thereof and sidewall portions standing from the footprint portion;
- and
- an optical reflector spaced apart by a certain distance from the footprint portion and having openings,
- the surface lighting unit being used in such a manner that the point-light source is placed in the hole,
- inner surfaces of the footprint portion and of the sidewall portions, and an inner surface of the optical reflector that faces the footprint portion being reflective surfaces,
- the optical reflector having a center thereof facing the point-light source,
- the openings being so formed that an opening ratio represented by a ratio of the area of the openings in a preset region on the optical reflector to the area of the preset region increases as a distance from the center of the optical reflector increases outward, and the sidewall portions having sidewall holes formed to satisfy the opening ratio;
- the highly directional point-light source placed in the hole, and
- wherein the openings are formed in a non-through hole around the center of the optical reflector, in a plurality of non-continuous arcuate holes on the outer side of the non-through hole, and in a plurality of through holes on the outer side of the arcuate holes.
7 more elements
A surface lighting device, wherein a surface lighting light source device is plurally arranged in a matrix,
- the surface lighting light source device comprising:
- a surface lighting unit including:
- a box-shaped casing having a footprint portion in which a hole for placing a highly directional point-light source is formed at the center thereof and sidewall portions standing from the footprint portion;
- and
- an optical reflector spaced apart by a certain distance from the footprint portion and having openings,
- the surface lighting unit being used in such a manner that the point-light source is placed in the hole,
- inner surfaces of the footprint portion and of the sidewall portions, and an inner surface of the optical reflector that faces the footprint portion being reflective surfaces,
- the optical reflector having a center thereof facing the point-light source,
- the openings being so formed that an opening ratio represented by a ratio of the area of the openings in a preset region on the optical reflector to the area of the preset region increases as a distance from the center of the optical reflector increases outward, and the sidewall portions having sidewall holes formed to satisfy the opening ratio;
- the highly directional point-light source placed in the hole, and
- wherein the openings are formed in a non-through hole around the center of the optical reflector, in a plurality of non-continuous arcuate holes on the outer side of the non-through hole, and in a plurality of through holes on the outer side of the arcuate holes.
8 more elements
Dependencies are inferred from the claim text.