Cover plate for lighting fixture and lighting fixture having the same
Disclosed is a cover plate for a lighting fixture and a lighting fixture having the same, which achieves superior light diffusivity and light uniformity as well as superior light transmission in comparison with the prior art, thereby improving a luminance characteristic. The cover plate is arranged at an exterior of an light source of the light fixture so as to exit lighting emitted from the light source outward. The cover plate is made of light transmissive resin material having 5-35% of bubbles for light scattering, which has a diameter within a range of 60 μm˜700 μm, and exits light emitted from the light source while diffusing the light to the whole area of the cover plate.
1. A cover plate for a lighting fixture disposed about a light source, comprising:
at least one light transmissive layer made of a resin material, having an inner surface proximate the light source, and an outer surface;
wherein said at least one light transmissive layer comprises a plurality of bubbles;
the bubbles having diameters within a range of 60 um to 700 um, and a bubble inclusion rate in the at least one light transmissive layer of 5-35% by volume; and
wherein the at least one light transmissive layer diffuses, refracts, and transmits light emitted from the light source through the entire outer surface.
2. The cover plate for a light fixture as claimed in claim 1 , wherein the diameter of the bubbles varies between the inner surface and the outer surface.
3. The cover plate for a lighting fixture as claimed in claim 1 , wherein a pattern having a predetermined prominence-depression shape is formed at the inner surface.
4. The cover plate for a lighting fixture as claimed in claim 3 , wherein the pattern has a prism-shape, a polypyramid shape, or an embossing shape, and is successively formed on the inner surface in its entirety.
5. The cover plate for a lighting fixture as claimed in claim 1 , further comprising:
a second light transmissive layer having no bubbles, the second light transmissive layer being integrally formed on one surface of the at least one light transmissive layer without an interfacial interface.
6. The cover plate for a lighting fixture as claimed in claim 5 , wherein a pattern of a predetermined prominence-depression shape is successively formed at an outer surface of the second light transmissive layer.
7. The cover plate for a lighting fixture as claimed in claim 5 , wherein the second light transmissive layer is made of the resin material used in the at least one light transmissive layer and adheres to one surface of the at least one light transmissive layer by being stacked on the one surface of the at least one light transmissive layer.
8. A lighting fixture comprising:
a case;
a light source installed within the case; and
a cover plate adjacent to the light source, the cover plate comprising:
at least one light transmissive layer made of a resin material, having an inner surface proximate the light source, and an outer surface;
wherein said at least one light transmissive layer comprises a plurality of bubbles having a bubble inclusion rate of 5-35% of bubbles by volume, and diameters within a range of 60 -700 um, for light scattering so that the cover plate transmits, refracts, and diffuses light emitted from the light source through a whole surface of the cover plate.
9. The lighting fixture as claimed in claim 8 , further comprising a supporting member installed at an interior of the case so as to support a rear surface of the cover plate so that the cover plate is prevented from getting bent toward the light source.
10. The lighting fixture as claimed in claim 8 , further comprising a second light transmissive layer for secondary diffusion installed at the inner surface or the outer surface of the at least one light transmissive layer the second light transmissive layer being made of the resin material.
11. The lighting fixture as claimed in claim 8 , wherein a pattern having a prominence-depression shape is formed at the inner surface of the at least one light transmissive layer.
12. The lighting fixture as claimed in claim 8 , further comprising:
a second light transmissive layer having no bubbles that is integrally formed on one surface of the at least one light transmissive layer without an interfacial surface.