The present disclosure describes a light fixture for general lighting. The light fixture is includes a light source assembly that uses a point source of light such as an LED, an aspheric reflector, and a lightguide made of transparent materials, that redirects and distributes the light from the point source to an area light. The novel light fixture is not only functional and provides low-glare illumination, it also has an aesthetically pleasing appearance.
1. A light fixture, comprising:
a lightguide having a top surface and an opposing bottom surface, the top surface comprising:
a primary reflector cavity surrounding a central axis;
an annular input surface disposed facing the primary reflector cavity;
an annular first reflector surface adjacent the annular input surface; and
a light source disposed along the central axis and adjacent a primary reflector within the primary reflector cavity,
wherein light rays from the light source reflect from the primary reflector, refract through the annular input surface, reflect from the annular first reflector surface, and are directed toward the opposing bottom surface of the lightguide.
2. The light fixture of claim 1 , wherein the top surface further comprises an annular second reflector surface adjacent the annular first reflector surface, positioned such that light rays reflect from the annular second reflector surface before reaching the opposing bottom surface of the lightguide.
3. The light fixture of claim 1 , wherein the light rays directed toward the opposing bottom surface comprises light rays travelling at an angle such that total internal reflection (TIR) occurs at an exterior surface disposed between the top surface and the opposing bottom surface.
4. The light fixture of claim 1 , wherein the light rays directed toward the opposing bottom surface comprises light rays travelling at an angle within 60 degrees of the central axis.
5. The light fixture of claim 1 , wherein the opposing bottom surface is an output surface comprising a lens, a plurality of facets, a diffuser, or a combination thereof.
6. The light fixture of claim 1 , wherein the annular first reflector surface comprises a polished surface capable of total internal reflection (TIR).
7. The light fixture of claim 1 , wherein the primary reflector comprises a shaped reflective film.
8. The light fixture of claim 1 , wherein the primary reflector comprises an aspherical reflector or a cusp-shaped reflector.
9. The light fixture of claim 1 , wherein the lightguide is symmetric around the central axis.
10. The light fixture of claim 1 , wherein the lightguide comprises a solid cylinder or a hollow cylinder.
11. The light fixture of claim 1 , wherein the light source comprises a light emitting diode (LED).
12. The light fixture of claim 1 , wherein the light source comprises a heat sink disposed exterior to the primary reflector cavity.
13. The light fixture of claim 1 , wherein the light rays from the light source reflect from the primary reflector toward a virtual annular focus positioned opposite the annular input surface.
14. The light fixture of claim 1 , wherein each of the primary reflector, the annular input surface, and the annular first reflector surface independently comprises a surface generated by rotating around the central axis a line, a piecewise line, a curve, or a piecewise curve.