Lighting device
View Patent ↗A lighting device includes a light source, first and second beam-directing prism elements, and a transmission device. The light source emits a light beam. The first beam-directing prism element is arranged in a first direction. The second beam-directing prism element is arranged in a second direction and partially overlapped with the first beam-directing prism element. When the light beam passes through different regions of the first and second beam-directing prism elements, different bending angles are resulted. The transmission device is connected to the first and second beam-directing prism elements for driving movement of the first beam-directing prism element in the first direction and movement of the second beam-directing prism element in the second direction. Accordingly, the light beam emitted by the light source simultaneously passes through one of the regions of the first beam-directing prism element and one of the regions of the second beam-directing prism element.
1. A lighting device comprising:
a light source for emitting a light beam;
a first beam-directing prism element arranged in a first direction, wherein different bending angles are resulted when the light beam passes through different regions of the first beam-directing prism element; and
a second beam-directing prism element arranged in a second direction and partially overlapped with the first beam-directing prism element, wherein different bending angles are resulted when the light beam passes through different regions of the second beam-directing prism element;
wherein the first beam-directing prism element is movable in the first direction, and the second beam-directing prism element is movable in the second direction;
wherein the light beam emitted by the light source simultaneously passes through one of the regions of the first beam-directing prism element and one of the regions of the second beam-directing prism element.
2. The lighting device according to claim 1 wherein the first beam-directing prism element and the second beam-directing prism element are made of transparent material such as polymethylmethacrylate (PMMA) or polycarbonate (PC).
3. The lighting device according to claim 1 wherein each of the first beam-directing prism element and the second beam-directing prism element has a surface with gradual slope variations.
4. The lighting device according to claim 1 wherein each of the first beam-directing prism element and the second beam-directing prism element has two surfaces with gradual slope variations.
5. The lighting device according to claim 1 wherein the first beam-directing prism element and the second beam-directing prism element are orthogonal with each other, so that the resultant irradiation positions of the light beam are adjustable in the two-dimensional coordinate system.
6. The lighting device according to claim 1 wherein the first beam-directing prism element comprises a downward directing region, a flat region and an upward directing region.
7. The lighting device according to claim 1 wherein the second beam-directing prism element comprises a rightward directing region, a flat region and a leftward directing region.
8. A lighting device comprising:
a light source for emitting a light beam;
a first ring-shaped-directing prism element, wherein different bending angles are resulted when the light beam passes through different regions of the first ring-shaped-directing prism element; and
a second ring-shaped-directing prism element partially overlapped with the first ring-shaped-directing prism element, wherein different bending angles are resulted when the light beam passes through different regions of the second ring-shaped-directing prism element;
wherein the first ring-shaped-directing prism element and second ring-shaped-directing prism element are rotatable, and the light beam emitted by the light source simultaneously passes through one of the regions of the first ring-shaped-directing prism element and one of the regions of the second ring-shaped-directing prism element.
9. The lighting device according to claim 8 wherein the first ring-shaped-directing prism element and the second ring-shaped-directing prism element are made of transparent material such as polymethylmethacrylate (PMMA) or polycarbonate (PC).
10. The lighting device according to claim 8 wherein each of the first ring-shaped beam-directing prism element and the second ring-shaped beam-directing prism element has a surface with gradual slope variations.
11. The lighting device according to claim 8 wherein each of the first ring-shaped beam-directing prism element and the second ring-shaped beam-directing prism element has two surfaces with gradual slope variations.
12. The lighting device according to claim 8 wherein the first ring-shaped beam-directing prism element comprises a downward directing region, a flat region and an upward directing region.
13. The lighting device according to claim 8 wherein the second ring-shaped beam-directing prism element comprises a rightward directing region, a flat region and a leftward directing region.