Abstract:
Specialized arrangements of tile elements designed with a view to paving schemes which permit a plurality of tiles to function together in a plane to produce an output beam of particular and configurable divergence. Prefabricated tiles are 'mixed and matched' to form various combinations which will support a prescribed output characteristic with respect to illumination beam divergence. When a system is being assembled, it is no longer necessary to re-design at the primary optics level to achieve an application specific beam divergence. Rather, standard tiles are selected and used to pave large areas; the overall system having desired output characteristics. In this way, the lighting systems have selectable and configurable divergence and no requirement for manipulation of the fundamental unit.
Abstract:
A special reflector system is integrated with a cover element as part of an LED package. The device supports wavelength shifting medium and highly efficient light coupling to output beams including low divergence beams. The reflector is made at a surface which provides a high-low index mismatch to set up a total internal reflection in a conic section shaped area. The device permits direct on board mounting of semiconductor chips without having to provide for shaped recesses or ancillary reflector systems.
Abstract:
Phosphors for use with high energy blue LEDs and methods for making same are presented. Such phosphors well suited for the specific task of forming a 'white' or broadband spectral output from a high brightness blue LED via wavelength shifting. These phosphors have been specifically prepared and designed with a view toward use with gallium nitride LED semiconductors. They are 'tuned' such that they efficiently respond to blue light. This results in improvement of the system quantum efficiency. In best versions of these phosphors, the most expensive components of phosphor compositions typical in the art have been left out. The phosphors presented have been devised and arranged to operate fully without need far expensive chemicals found hi prior systems. As such, they are less expensive to produce and are thus more suitable for applications such as general lighting applications.
Abstract:
New combinations of semiconductor devices in conjunction with optically active materials are set forth herein. In particular, light emitting semiconductors fashioned as diodes from indium gallium nitride construction are combined with high-performance optically active Langasite La3GasSi0i4 crystalline materials. When Langasite is properly doped, it will respond to the light output emissions of the diode by absorbing high energy photons therefrom and reemitting light of longer wavelengths. High-energy short wavelength light mixes with the longer wavelengths light to produce a broad spectrum which may be perceived by human observers as white light. Langasite, a relatively new material, enjoying great utility in frequency control and stabilization schemes has heretofore never been used in combination with optical emission systems.
Abstract:
A special reflector system is integrated with a cover element as part of an LED package. The device supports wavelength shifting medium and highly efficient light coupling to output beams including low divergence beams. The reflector is made at a surface which provides a high-low index mismatch to set up a total internal reflection in a conic section shaped area. The device permits direct on board mounting of semiconductor chips without having to provide for shaped recesses or ancillary reflector systems.
Abstract:
Light emitt ng diode systems disclosed include semiconductor diodes arranged in cooperation with e Lectrical contacts, mounting provisions, and optical couplings; where the optical couplings include at least a Fresnel lens. A Fresnel lens is further coupled to additional optical c lements such as a concave or 'negative' lens and still further to a reflector operating via principles of total internal reflection. Both the concave lens and the reflector are asl iherical in preferred versions. A cover element of single piece plastic may be formed in, i. molding process whereby all three of these optical elements, i.e. the Fresnel lens, the nc gative lens and the reflector, are formed into the single plastic piece. Further, the plastic piece may be arranged to also accommodate auxiliary systems such as alignment indexing and fastening means as well as interlocking peripheral configurations.
Abstract:
New high-performance, highly tunable photophosphors are presented. These photophosphor's pump spectra and emission spectra are both manipulated via variances in the formulation of compounds taught herein. In addition, new combinations of semiconductor devices in conjunction with these optically active materials are described. In particular, light emitting semiconductors fashioned as diodes from indium gallium nitride construction are combined with these photophosphors. High-energy short wavelength light mixes with the longer wavelengths light emitted by the halogen-silicate photophosphor to produce a broad spectrum perceived by human observers as "white light".
Abstract:
Heat transfer systems are presented with improved heat dissipation schemes based upon an asymmetric arrangement of Peltier elements to form a hot side of greater area than the cold side. This permits greater heat dissipation at the hot side of the heat transfer device into a suitable heat sink. A substantially planar system of radial symmetry is the basis of a highly efficient heat spreading scheme. The 'spokes' of the system are piewedge shaped Peltier semiconductor elements having a small heat transfer junction at one end and large heat transfer junction at the other.. In best versions, a concentric ring scheme has a cooled area at the center and a heat dump at the periphery. Semiconductor Peltier elements connect the two and provide a vehicle to carry heat radially away from a heat point source thermally coupled to the heat transfer system at an active area. These special arrangements are provided while still maintaining the necessary serial electronic circuit and parallel thermal circuit.
Abstract:
A special reflector system is integrated with a cover element as part of an LED package. The device supports wavelength shifting medium and highly efficient light coupling to output beams including low divergence beams. The reflector is made at a surface which provides a high-low index mismatch to set up a total internal reflection in a conic section shaped area. The device permits direct on board mounting of semiconductor chips without having to provide for shaped recesses or ancillary reflector systems.
Abstract:
Peltier semiconductor heat transfer systems are presented herein. In particular, Peltier heat transfer systems of Peltier semiconductor elements (31) are arranged to bias the cooling side with respect to its size and consequently performance. In effect, a Peltier heat transfer system is created whereby the Peltier cold side (34) is greatly reduced in size and the Peltier hot side (35) is greatly expanded in size. Such 'high aspect ratio' Peltier systems promote 'focused' cooling effect, which is particularly useful in conjunction with high-performance electronic devices having a small footprint (38) . The entire cooling effect of the Peltier device is brought to the small space approximated by a point . Thus a ' point ' heat source such as a semiconductor laser or a high-performance light emitting diode is more effectively cooled by these systems .