Resin-Shielded Lens Structure for Reduced Light Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light emitting devices face challenges in effectively reducing light leakage and improving light transmission efficiency, particularly in applications like cellular phones, where conventional metal reflecting members are inefficient and prone to degradation.
Innovation Solution
A lens structure comprising a cover part and a light-shielding part, where the cover part is formed of a thermosetting first resin and the light-shielding part is formed of a thermosetting second resin with higher light absorptance or reflectance, is used to minimize light leakage by covering lateral surfaces and flange parts, while the lens part allows light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal film is used as the light-reflecting member formed by vacuum vapor deposition, then light reflection is achieved, but the structure is complex and prone to degradation
Solution Approach 1:
The patent replaces the complex metal film structure with a simple resin-based light-shielding part that can be easily manufactured and replaced. This resin component serves the same light-blocking function but with superior reliability and simpler construction, eliminating the need for complex vacuum vapor deposition processes.
Solution Approach 2:
The patent substitutes the mechanical/vacuum-based metal film deposition process with a chemical molding process. Instead of using vacuum vapor deposition to create metal films, the invention uses resin molding to create an integrated light-shielding structure that is simpler, more reliable, and easier to manufacture.
2Productivity
If the lens structure does not have adequate light-shielding components, then manufacturing is simple, but light leakage occurs reducing transmission efficiency
Solution Approach 1:
The patent merges the light-shielding function with the lens structure by integrating the light-shielding part directly into the lens assembly. The light-shielding part is positioned to cover lateral surfaces and flange parts, preventing light leakage while maintaining a unified, compact structure that does not significantly increase overall complexity.
Solution Approach 2:
The patent applies light-shielding properties specifically where needed - on the lateral surfaces and flange parts of the lens structure. Instead of making the entire lens opaque, the light-shielding part is strategically positioned only at locations where light leakage would occur, maintaining optical clarity where required while blocking light where necessary.
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 proposed lens structure significantly reduces light leakage and enhances light transmission efficiency by absorbing or reflecting light at the lateral surfaces, thereby improving the performance of light emitting devices.
Implementation Method 1
The light-shielding part is formed of a thermosetting second resin having a greater light-absorptance or a greater light-reflectance than the thermosetting first resin
Implementation Method 2
The light-shielding part is formed of a thermosetting second resin having a greater light-absorptance or a greater light-reflectance than the thermosetting first resin
Data Source
AI summary
A light emitting device includes a light emitting element, a cover part, and an interposing member formed of a light-reflecting material. The cover part includes a lens part, a flange part, and a connection part connecting the lens and flange parts. An upper surface of the interposing member abuts a lower surface of the connection part. The lens part and the interposing member define a recess having an opening. The inner lateral surface defines a lateral surface of the recess, which defines the opening. The lens part has a convex lens, a light incidence surface with a plurality of projections, and a light-emitting surface that has a flat surface at least around an outer perimeter of the lens part. At least a portion of the interposing member is located outside of the lens part in plan view. The interposing member does not overlap with the lens part in plan view.