Illuminated waterfall

[0002] This application claims the benefit of the Mar. 17, 2000, filing date of United States provisional patent application serial no. 60/190,432.

[0003] This invention relates generally to the field of fiber optic lighting, and more specifically to a method and apparatus for illuminating a waterfall for a pool or spa with a fiber optic light source.

[0004] It is known to use a fiber optic light source to provide illumination for portions of a pool or water spa. Fiber optic cables are small and flexible and can be used to deliver light to locations that are impractical for other light sources. Importantly, the light source and its related electrical components can be located at a safe distance from the pool or spa water.

[0005] It is known to illuminate a waterfall of a pool or spa with fiber optic light. One such device uses a fiber optic cable bundle to provide light to an acrylic bar disposed along the edge of a waterfall. Light emanates from along the length of the acrylic bar and illuminates the water as it flows over the bar to form the waterfall. Another known device provides light from a side emitting fiber disposed along an edge of a waterfall. The side emitting fiber is installed into a waterfall structure and is provided with light from the end of an end emitting delivery fiber connected to the waterfall structure. However, the intensity of the light provided by these known devices is limited by the efficiency of the light transfer mechanisms used. Furthermore, the width of the waterfall must necessarily be limited in order not to reduce the intensity of the light, and in order not to produce a noticeable difference in intensity from one side of the waterfall to the other. For example, the devices described above are believed to be available for waterfalls up to only 24 inches wide.

[0006] Thus there is needed a method and apparatus for illuminating a waterfall that provides a high intensity light and that is capable of illuminating a waterfall greater than 24 inches wide.

[0007] Described herein is a waterfall apparatus comprising a generally rectangular shaped water conduit having an inlet for receiving water into the interior of the water conduit and having an outlet edge for producing a waterfall as the water flows out of the water conduit; a fiber optic cable bundle attached to the water conduit, the fiber optic cable bundle comprising a plurality of fibers, each fiber adapted to receive light at an input end and to emit light at an output end; wherein the output ends of the respective fibers are disposed proximate the outlet edge of the water conduit.

[0008] Also described herein is a method of illuminating a waterfall, the method comprising the steps of providing a plurality of optical fibers, each fiber operable to receive light at an input end and to emit light at an output end; disposing the output ends of the respective fibers along an underside of a waterfall; and providing light into the input ends of the respective fibers.

[0009] FIG. 1 is a perspective view of a waterfall apparatus having a plurality of end emitting fibers disposed along an underside of an outlet edge of a water conduit.

[0010] FIG. 2 is an elevation view of the waterfall apparatus of FIG. 1 as it may be installed in a pool.

[0011] FIG. 1 illustrates a waterfall apparatus 10 illuminated by a fiber optic cable bundle 12 containing a plurality of individual fibers 14. The waterfall apparatus 10 includes a generally rectangular shaped water conduit 16 having an inlet 18 for receiving water into the interior 20 of the water conduit 16, as can be seen in the cut-away portion of FIG. 1. The water conduit 16 also has an outlet edge 22 for producing a waterfall as the water flows out of the water conduit 16.

[0012] The waterfall apparatus 10 is formed to include an enclosed water conduit 16 in order to facilitate its installation into a pool or spa structure, as illustrated in FIG. 2. A wall 24 forms a water barrier for a pool of water 26. The water conduit 16 is disposed on top of wall 24 and is formed of metal or other material capable of bearing the weight of the concrete coping 28 or other decking material surrounding the pool of water 26. The inlet 18 of the water conduit 16 is connected to water supply pipe 30 for providing water to the waterfall 32. As is known in the art, the water used for the waterfall may be recycled from the pool of water 26. The water may be directed from the inlet 18 into a water distribution apparatus 34, as may be seen in both FIGS. 1 and 2. The water distribution apparatus 34 helps to direct a laminar flow of water to the outlet edge 22 in order to provide an attractive waterfall effect. In other embodiments, the water conduit 16 need not be a closed structure, but rather may include only a bottom plate 36 for conveying the water along its upper surface from the inlet 18 to the outlet edge 22. The bottom plate 36 may be flat or may have a curved surface to help to direct the flow of water. Conduit 16, plate 36 and similar structures may be referred to collectively as water directing structures.

[0013] Fiber optic cable bundle 12 is enclosed within a fiber conduit 38 attached to a side portion of water conduit 16 and extending along an underside of outlet edge 22. A plurality of holes 40 are formed along the underside of fiber conduit 38, and the output ends 42 of the respective individual fibers 14 are disposed in or through the holes 40 to direct light downward onto surfaces 44 located under the waterfall 32. Advantageously, light emitted from the fiber ends 42 illuminates the surface of the wall 24 and the pool of water 26 under the waterfall 32. The applicant has found that such illumination provides a pleasing glow and lighting effect as the bubbles and currents formed in the pool of water 26 by the action of the waterfall 32 reflects and refracts the light back to the observer. The input ends 46 of the fibers 14 may be connected to a light source 48, as is known in the art, for providing white light or light of one or more predetermined wavelengths.

[0014] The fibers 14 may be of a design known in the art to emit light from their ends, such as the End-Glow™ cables sold by Super Vision International, Inc. The width W of the water fall is not limited by the capability of an individual side glow cable nor by the efficiency of an acrylic tube. Furthermore, light may be provided from the ends of optical fibers without passing through additional connectors associated with the waterfall structure. Any desired width W may be illuminated by incorporating an appropriate number of fibers into the waterfall apparatus 10 as necessary to achieve a desired light intensity. For very wide waterfalls, it may be desirable to provide a fiber conduit 38 and fiber bundle 12 on both sides of water conduit 16 in order to reduce the diameter of the bundle 12. Furthermore, it may be desirable to direct a portion of the fiber output ends 42 in a direction other than straight downward in order to varying illumination effects for different applications. Moreover, different individual fibers 14 may be provided with light of a different wavelength or a changing wavelength to provide a desired effect. A lens 50 may be positioned near one or more of the fiber output ends to further enhance a desired effect,

[0015] While the preferred embodiments of the present invention have been shown and described herein, it will be obvious that such embodiments are provided by way of example only. Numerous variations, changes and substitutions will occur to those of skill in the art without departing from the invention herein. Accordingly, it is intended that the invention be limited only by the spirit and scope of the appended claims.