Integral Bifocal Lens Design for Polarizing Film Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multifocal polarizing lenses face challenges such as high cost, lack of durability, impact resistance, and visibility of the addition power segment, along with adhesion and deformation issues due to separate resin components and the expensive polarizing film.
Innovation Solution
A bifocal lens design where the addition power segment and bench lens are formed integrally on the rear surface of a polarizing member using poly vinyl alcohol and poly carbonate, with the resin being molded to the same composition and cut to reduce deformation and visibility, enhancing adhesion and impact resistance while minimizing polarizing film usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the addition power segment is manufactured separately and attached to the bench lens, then the multifocal function is achieved, but the lens lacks durability and impact resistance
Solution Approach 1:
The patent merges the addition power segment and bench lens into a single integral structure manufactured from the same resin material. This eliminates the separate attachment process and creates a unified lens that maintains durability and impact resistance throughout the entire structure, including the addition power segment region.
Solution Approach 2:
The patent uses the same resin material for both the addition power segment and the bench lens, creating a homogeneous structure with uniform optical and mechanical properties. This eliminates adhesion issues between different materials and ensures consistent durability and impact resistance across the entire lens.
2Reliability
If the addition power segment is arranged on the front surface side, then the multifocal function is achieved, but the segment becomes visible from outside and manufacturing defects occur
Solution Approach 1:
The patent inverts the conventional arrangement by placing the addition power segment on the rear surface of the lens instead of the front surface. This reversal makes the addition power segment invisible from the outside while maintaining its optical function, and eliminates manufacturing defects associated with front-surface placement.
3Manufacturing precision
If different resin materials are used for the bench lens and addition power segment to achieve different refraction indices, then the multifocal optical function is achieved, but adhesion problems and detachment occur
Solution Approach 1:
The patent uses the same resin material for both the addition power segment and the bench lens, creating a homogeneous structure with uniform optical and mechanical properties. This eliminates adhesion issues between different materials and ensures consistent durability and impact resistance across the entire lens.
4Reliability
If the polarizing film is stretched to create polarizing function, then the polarizing effect is achieved, but lens deformation occurs during molding
Solution Approach 1:
The patent applies preliminary stretching to the polarizing film before the molding process to establish the desired polarizing function and dimensional stability. This pre-treatment prevents deformation during subsequent molding operations by preparing the film to withstand the molding process without excessive stress or distortion.
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 solution results in a cost-effective, durable, and impact-resistant lens that conceals the addition power segment, improving user experience by reducing lens deformation and making the bifocal design suitable for senior generations without noticeable age indicators.
Implementation Method 1
Polarizing lenses have their effect to prevent reflected light from going into the eye, and in particular they prevent reflected light from water surface, snow surface, and road surface
Implementation Method 2
the resin is stretched so as to have polarizing function, and poly carbonate to sandwich both the surfaces thereof are also stretched in order to reduce deformation
Data Source
AI summary
This invention is to provide an inexpensive lens can be worn without attention to the existence of the addition power segment of conventional polarizing lens, it and a bench lens are formed integrally on the rear surface of a polarizing member 6. The present inventors constituent a polarizing member 9 by sandwiching poly vinyl alcohol 3 as a polarizing film with poly carbonate 2 whose both surfaces are stretched, and mold resin 2′ on the rear side of the polarizing member, and arrange an addition power segment 8 integrally on the rear surface, make the molded resin poly carbonate sandwiches the polarizing film. The top and the bottom of this member are cut as FIGs. to form lens at low costs, and the adhesion among respective resins is increased, and to secure the impact resistance and it is possible to create a lens without detachment because of same resin.