Lens Height Rate Design for Uniform Light Distribution
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Solution Overview
Problem
Existing lighting devices struggle to uniformly distribute light within a specific angular range, particularly in applications like refrigerators where consistent light dispersion is crucial.
Innovation Solution
A lens with specific geometric parameters, including height and tangential rates for its entrance and exit surfaces, is designed to ensure uniform light distribution within an 80-degree to 90-degree range, featuring symmetrical and varying curvature surfaces to optimize light path adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional lens shape is used, then the lens structure is simple, but the light distribution is not uniform within the specified angular range
Solution Approach 1:
The patent applies parameter changes by precisely controlling the height rate (HR) and tangential rate (TR) parameters of the lens surfaces. The light entrance surface has HR1 and TR1, while the light exit surface has HR2 and TR2, with specific relationships between these parameters to achieve uniform light distribution within the 80-90 degree angular range
Solution Approach 2:
The patent employs curved surfaces for both the light entrance and light exit surfaces of the lens. The light exit surface is specifically designed with a curved profile defined by the height rate and tangential rate parameters, which controls the refraction of light to achieve uniform angular distribution
2Illumination intensity
If the lens shape is optimized for uniform light distribution, then light uniformity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges and relationships that balance performance with manufacturability. The height rate HR1 of the light entrance surface and height rate HR2 of the light exit surface satisfy a specific mathematical relationship, as do the tangential rates TR1 and TR2, making the design both effective and manufacturable
3Reliability
If a molding member is used as a primary lens, then the light-emitting structure is protected, but the light path control precision is insufficient for uniform radiation
Solution Approach 1:
The patent divides the optical system into two functional parts: a molding member that serves as a primary lens for protection and basic light direction, and a secondary lens with precisely controlled surfaces for fine-tuning the light path. This segmentation allows each component to specialize in its function while achieving overall system goals
Solution Approach 2:
The secondary lens acts as an intermediary between the light-emitting element and the final light output. It receives light from the molding member and precisely controls its refraction to achieve uniform angular distribution, mediating between the protective molding member and the light emission requirements
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 lens achieves uniform luminosity and consistent light distribution within the specified angular range, making it suitable for use as a uniform light source in linear shapes within refrigerators and similar environments.
Implementation Method 1
Light is refracted when passing through the molding member, which is formed of silicon or the like. Thus, the molding member may serve as a primary lens.
Data Source
AI summary
Provided is a lens according to an embodiment that comprises: a light entrance surface; and a light exit surface facing the light entrance surface, wherein the product of the height rate (HR) of the light entrance surface and the HR of the light exit surface on a section in one direction ranges from 1.45 to 1.66, where the HR of the light entrance surface is h0/h1, h0 denotes the distance from a reference line to the light entrance surface corresponding to the central axis, and h1 denotes the height from the reference line to the midpoint of the straight line connecting regions P11 and P12 on the light entrance surface that correspond to points at one-third and two-thirds of the distance from one end of the reference line to the central axis, respectively, and where the HR of the light exit surface is h3/h2, h3 denotes the distance from the reference line to the light exit surface corresponding to the central axis, and h2 denotes the height from the reference line to the midpoint of the straight line connecting regions P21 and P22 on the light exit surface that correspond to points at one-third and two-thirds of the distance from one end of the reference line to the central axis, respectively.