Thin Glass Lens Composition Preventing Die Fusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional press forming techniques struggle to produce thin lenses with high shape and surface accuracy due to glass fusion bonding with the forming die, leading to deteriorated lens quality and increased maintenance costs, especially when producing lenses with thicknesses of 0.5 mm or less.
Innovation Solution
A glass composition containing 12 to 16% B2O3, 35 to 44% La2O3, and 3 to 8% ZnO, which prevents glass fusion bonding to the forming die during press forming, allowing for the stable production of thin lenses with improved shape accuracy and reduced maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional press forming is used to produce thin lenses with thickness of 0.5 mm or less, then lens thickness is reduced, but glass fusion bonding to the forming die occurs, deteriorating shape accuracy and surface finish
Solution Approach 1:
The patent applies parameter changes by modifying the glass composition parameters (adding specific oxide components like B2O3, SiO2, Al2O3 in defined ranges) to alter the glass's physical and chemical properties, specifically its resistance to fusion bonding with the forming die, thereby enabling accurate formation of thin lenses without the harmful adhesion effect
Solution Approach 2:
The patent uses composite materials by creating a multi-component glass system combining various oxides (B2O3, SiO2, Al2O3, La2O3, ZnO, etc.) in specific proportions to achieve a material with both the desired optical properties and the anti-fusion bonding characteristic, resolving the contradiction between thin lens production and manufacturing precision
2Length of moving object
If conventional press forming is used for thin lenses, then lens thickness is reduced, but the forming die surface accuracy deteriorates due to residual glass adhesion
Solution Approach 1:
The patent changes the chemical composition parameters of the glass to include specific oxide ranges that prevent fusion bonding, thereby protecting the forming die surface accuracy from deterioration while still enabling the production of thin lenses with reduced thickness
3Reliability
If pretreatment techniques are applied to prevent glass fusion bonding, then separation from forming die is improved, but the number of steps and cost increase
Solution Approach 1:
The patent applies the self-service principle by incorporating anti-fusion bonding properties directly into the glass material composition itself, allowing the glass to prevent its own adhesion to the forming die without requiring external pretreatment processes, coatings, or additional steps, thereby maintaining reliability while reducing complexity and cost
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 specified glass composition effectively prevents glass fusion bonding, enabling the production of thin lenses with high shape accuracy and reduced maintenance requirements, thus enhancing the productivity and cost-effectiveness of image pickup optical systems.
Implementation Method 1
the glass for the optical component contains 12 to 16% of B2O3, 35 to 44% of La2O3, and 3 to 8% of ZnO, expressed as wt %, use of the glass containing components within the ranges as mentioned above can prevent the glass from fusion bonding to a forming die
Implementation Method 2
clamping the forming the transferring the surface shape of the forming die to the preformed body by heating and pressing the preformed body
Data Source
AI summary
This is to shed light on a glass composition suitable for a thin lens, and provide a lens (an optical component) manufactured with using the glass. A concave lens as an optical component is made of glass containing 12 to 16% of B2O3, 35 to 44% of La2O3, and 3 to 8% of ZnO, expressed as wt %. The concave lens has a thickness t1 in its center portion of 0.5 mm or less, and a ratio (W/t1) of an external diameter W with respect to the thickness t1 of 24 or more. The concave lens can be produced suitably by press forming.