LED Diffusion Lens with Conic and Aspheric Surfaces
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Solution Overview
Problem
Conventional diffusion lenses for LEDs are complex to produce due to their shape, making it difficult to eject the lens from a mold and adjust light distribution, leading to uneven illumination, especially in the central portion.
Innovation Solution
A diffusion lens design featuring a conic first lens surface for total reflection in the central direction, a second lens surface for total reflection in the diagonal direction, and a third lens surface for refraction in the lateral direction, with V-shaped inclined surfaces and aspheric shapes to facilitate uniform light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional diffusion lens with a funnel-shaped protrusion and depressed part is used, then light diffusion function is achieved, but the lens cannot be easily ejected from the mold after injection molding
Solution Approach 1:
The invention removes the problematic funnel-shaped protrusion and depressed part from the lens structure. By eliminating these complex geometric features, the lens can be easily ejected from the mold after injection molding without requiring complex mold designs or ejection mechanisms.
Solution Approach 2:
Instead of creating light diffusion through complex geometric protrusions and depressions, the invention inverts the approach by using a substantially flat lens surface combined with precise control of the optical path through the LCD panel. The light diffusion function is achieved through the interaction of light with the LCD's internal structures rather than through complex lens geometry.
2Illumination intensity
If LED light is refracted through the first lens surface in the conventional design, then some light distribution is achieved, but the center portion of the lens becomes darker than the surrounding portion
Solution Approach 1:
The invention applies different optical functions to different regions of the system. The lens provides a flat transmission surface, while the LCD panel's internal structures (such as the polarizer, liquid crystal layer, and diffuser) are optimized to provide the light diffusion function. This local differentiation of functions achieves uniform light distribution without requiring complex lens surface geometry.
Solution Approach 2:
The invention introduces the LCD panel as an intermediary element between the LED light source and the final illumination area. The LCD panel's internal structures serve as the primary light diffusion mechanism, mediating the light distribution function that would otherwise require complex lens geometry. This intermediary approach enables uniform light distribution across the entire illumination area including the center portion.
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 simplifies the production process, allows easy ejection from a mold, and achieves uniform light diffusion in the central, diagonal, and lateral directions, preventing the central portion from being darker than the surrounding areas.
Implementation Method 1
a conic first lens surface upwardly protruded along a central axis of the lens, and adapted to totally reflect light, incident through the bottom surface, in a central direction of the lens
Implementation Method 2
a second lens surface upwardly inclined from an outer end of the conic first lens surface, and adapted to totally reflect light, incident through the bottom surface, in a diagonal direction of the lens
Implementation Method 3
a third lens surface extending from an outer end of the second lens surface to the bottom surface, and refracting light, incident through the bottom surface, in a lateral direction of the lens
Data Source
AI summary
Disclosed herein is a diffusion lens for diffusing LED light. The diffusion lens of the present invention includes a bottom surface, a conic first lens surface, a second lens surface, and a third lens surfaces. According to the present invention, it is easy to manufacture a mold required to manufacture a diffusion lens for diffusing LED light, and to eject the diffusion lens after molding has been performed, and it can uniformly diffuse LED light in the central direction, the diagonal direction and the lateral direction of the lens.