Solid State Lamps Using Photoluminescent Wavelength Conversion Components

Abstract

The present invention discloses improved photoluminescence wavelength conversion components and lamps incorporating such components. The photoluminescent wavelength conversion assembly includes a hollow cylindrical tube having a bore of given diameter and an axial length. The relative size and shape of the components can affect the radial emission pattern of the components, and the components are configured to impart a desired emission pattern (typically omnidirectional). During manufacture of the component, the photoluminescent material may be distributed homogeneously throughout the volume of the component. The improved photoluminescence wavelength conversion component can be formed using extrusion methods. The assembly may also be formed using injection molding or casting. Another possible method is to manufacture the component by forming a flexible sheet to include phosphor and / or quantum dots and then rolling the sheet into the desired shape and size for the component. The improved wavelength conversion components and lamps incorporating these components provide improved emission characteristics while allowing relatively cost-effective manufacturing costs. A further advantage of the assembly is that its light emission is similar to the filament of a conventional incandescent light bulb.

Description

technical field [0001] The present invention relates to solid state lights using photoluminescence wavelength conversion components. In particular, but not exclusively, embodiments relate to photoluminescent wavelength conversion assemblies for solid state lamps (bulbs) with omnidirectional emission patterns. Additionally, the present invention provides methods of making photoluminescent wavelength conversion components. Background technique [0002] LEDs that produce white light ("white LEDs") are a relatively recent innovation and are opening up the possibility of a whole new generation of energy-efficient lighting systems. Predictably, white LEDs can replace filament (incandescent) light sources, fluorescent light sources, and compact fluorescent light sources due to their long operating life (possibly many 100,000 hours) and their high efficiency in terms of low power consumption. It was not practical to develop LED-based white light sources until LEDs were developed t...

AI Technical Summary

Problems solved by technology

[0007] Although figure 1 The lamp 10 has improved emission characteristics, but because it emits too much light on the axis 24, the emission characteristics of this lamp do not meet the required industry standards

Another problem with such lamps is the relatively high manufacturing cost of the photoluminescent wavelength conversion components, usually manufactured by injection molding

The high manufacturing cost results from the fact that the opening of the component is smaller than the maximum internal size of the component, which requires the use of a collapsible bobbin to be able to remove the component from the injection molding machine

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