Optical Lens Edge Light Shielding for Mobile Terminals
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Solution Overview
Problem
The challenge is to reduce the thickness and size of optical lens units while minimizing light leakage caused by reflected light at the interface, which is a problem in mobile terminals where size reduction is desired but conventional methods using spacers with refractive index differences lead to surface reflection and light leakage.
Innovation Solution
An optical lens with a non-transparent region in the lens edge part, made from a thermoplastic resin containing black dye or pigment, is integrated with the lens part using insert molding and two-color molding, eliminating the need for a spacer and enhancing anti-reflection properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a spacer is added between lenses for antireflection and light shielding, then light leakage is reduced, but device thickness and size increase
Solution Approach 1:
The patent merges the spacer function with the lens edge part by integrating the light shielding function directly into the lens structure. The lens edge part is formed with a non-transparent region that performs both the structural support function of a spacer and the light shielding function, eliminating the need for a separate spacer component and reducing overall device thickness.
Solution Approach 2:
The lens edge part is designed to serve multiple functions: it provides structural support, defines the optical aperture, and performs light shielding through its non-transparent region. This multi-functional design replaces the traditional separate spacer component, achieving both light leakage prevention and thickness reduction.
2Object-affected harmful factors
If a spacer with different refractive index is used, then light shielding is improved, but surface reflection occurs causing light leakage
Solution Approach 1:
The patent applies homogeneity by using the same resin material for both the lens part and the lens edge part. This eliminates the refractive index difference between different materials, preventing surface reflection at the interface while maintaining effective light shielding through the non-transparent region design.
3Length of stationary object
If lens thickness is reduced for size reduction, then device compactness is improved, but light shielding capability deteriorates
Solution Approach 1:
The patent applies local quality by creating a non-transparent region specifically in the lens edge part where light shielding is needed. This localized light shielding approach maintains thin overall lens thickness while providing effective light blocking at the critical edge regions where light leakage would occur.
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
This solution allows for size reduction of optical lens units, improved anti-reflection and light-shielding properties, reduced production costs, and enhanced image clarity by minimizing light leakage and diffused reflection.
Implementation Method 1
the non-transparent region in the lens edge part contains 0.1 to 5% by mass in total of one or more of a black dye and a black pigment
Implementation Method 2
a method for producing the same, and an optical lens unit comprising the optical lens
Data Source
AI summary
Provided is an optical lens formed by integrally molding a lens part that is an optically effective portion and has a light incidence/emission surface, and a lens edge part that is an optically ineffective portion and has a surface thereof except the light incidence/emission surface. The lens edge part includes a non-transparent region in part or all thereof, the lens part and the lens edge part include a thermoplastic resin, and the non-transparent region in the lens edge part contains a total of 0.1-5 mass % of one or more of a black dye and a black pigment.