LED Package Convex Lens Nesting for Light Extraction
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Solution Overview
Problem
Conventional LED packages face challenges in increasing light extraction efficiency while minimizing their size and height, as light reflection at the interface between the sealing resin and air leads to absorption and reduced efficiency.
Innovation Solution
An LED package design featuring a board with a conductive part, a case with a reflective face, and a lid with a convex lens portion that focuses light emitted from the LED element, with the lens portion accommodated in the case's through area, enhancing light extraction efficiency and reducing package size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a convex projection is formed in the LED package to focus light and increase extraction efficiency, then light extraction efficiency is improved, but the height and size of the LED package increase
Solution Approach 1:
The convex lens portion is nested within the through area of the case, allowing the focusing element to be contained within the existing package boundaries rather than adding external protrusions. This resolves the contradiction by integrating the light-focusing function into the internal structure of the case, maintaining compact external dimensions while achieving improved light extraction efficiency through proper optical focusing
2Loss of energy
If the optical path length is increased to improve light focusing, then light extraction efficiency is improved, but the package size increases
Solution Approach 1:
The convex lens portion utilizes curved optical surfaces to focus light efficiently. The curvature of the lens allows for effective light focusing with a compact optical path length, avoiding the need for long straight optical paths. This resolves the contradiction by using geometric optics principles to achieve efficient light extraction without increasing package volume
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 design effectively increases light extraction efficiency while minimizing the height and size of the LED package by focusing light emitted from the LED element and reducing the optical path length, thereby suppressing biased luminous flux and enhancing reflectivity.
Implementation Method 1
the lens portion is accommodated in the through area of the case
Implementation Method 2
focus the light emitted from the LED element properly, thereby increasing the light extraction efficiency
Implementation Method 3
The internal surface of the case functions as a reflector that reflects light emitted from the LED element
Data Source
AI summary
An LED package includes an LED element, a board having an obverse face and a mounting face opposite to the obverse face, a conductive part formed on both the obverse face and the mounting face of the board and having an installation face upon which the LED element is disposed, a case having a reflective face that encloses the LED element and defines a through area, and a lid having a top face and a back face. The lid is disposed on the case so that the back face of the lid is directed to the case. The back face of the lid is formed with a convex lens portion protruding toward the LED element so as to be accommodated in the through area of the case.