Integrated LED Optic with Tilted Wedge and CPC for Collimation
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Solution Overview
Problem
Conventional LED packages require a two-stage assembly for light direction control, which is inefficient, and existing optics either increase extraction efficiency but not redirect light or redirect light without enhancing extraction.
Innovation Solution
An integrated optic design that includes a truncated compound parabolic concentrator and a tilted wedge, providing optical contact with the LED die to substantially collimate light, similar in size to a hemispherical dome overmold, allowing for efficient light redirection and extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a hemispherical dome overmold is used, then extraction efficiency is improved, but light redirection capability deteriorates
Solution Approach 1:
The patent combines the hemispherical dome structure (for extraction efficiency) with a compound parabolic concentrator and tilted wedge structures (for light redirection) into a single integrated optic. This merging allows the optic to simultaneously achieve high extraction efficiency and effective light redirection, resolving the contradiction between these two functions that were previously separated in conventional designs.
Solution Approach 2:
The integrated optic performs multiple functions within a single component: it extracts light from the LED die, redirects the light in specific directions, and collimates the output. This multi-functionality eliminates the need for separate components and allows the system to achieve both high extraction efficiency and superior light redirection capability simultaneously.
2Ease of operation
If a two-stage assembly (separate optic and LED die) is used, then light direction control is achieved, but assembly complexity and inefficiency increase
Solution Approach 1:
The patent integrates the optic directly with the LED die to form a single unified component, eliminating the need for separate assembly stages. The optic is designed to mate precisely with the LED die, creating an integrated structure that simplifies assembly while maintaining precise light direction control.
3Ease of operation
If conventional separate optics are used, then light redirection is achieved, but extraction efficiency enhancement is lost
Solution Approach 1:
The integrated optic merges the light redirection functions with the extraction enhancement structures, allowing both functions to work synergistically. The compound parabolic concentrator and tilted wedge are designed to work in conjunction with the hemispherical dome, achieving both high extraction efficiency and effective light redirection simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The integrated optic design achieves high collimation and efficient light use, reducing the number of LED dies or electrical power required, with performance superior to conventional hemispherical dome overmolds and other CPC designs.
Implementation Method 1
The optic includes a truncated compound parabolic concentrator and a tilted wedge atop the truncated CPC... substantially collimates light from the die
Implementation Method 2
The lower exterior surface is defined by a tilted parabolic segment rotated about an axis of symmetry... redirects the light
Data Source
Figure 1
Figure 2
Figure 3-1~3-2
AI summary
A primary optic for a light-emitting diode or device (LED) includes a tilted wedge atop a truncated compound parabolic concentrator (CPC). The CPC includes an input face and a lower exterior surface defined by a tilted parabolic segment rotated about an axis. The bottom end of the lower exterior surface joins the perimeter of the input face. The tilted wedge includes an upper exterior surface above the lower exterior surface, and an interior conical surface surrounded by the lower and the upper exterior surfaces. The upper exterior surface is defined by a tilted straight line rotated about the axis. The interior conical surface is defined by a smooth curve rotated about the axis. The interior conical surface has a vertex located at the axis and within the lower exterior surface. The top ends of the interior conical surface and the upper exterior surface join to define an output aperture.