Glass Layer Selective Weakening for Optical Component Protection
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Solution Overview
Problem
Glass layers in systems with optical components often fracture excessively during impact events, compromising the operation of these components due to their inherent brittleness and high modulus of elasticity, leading to widespread cracking and potential damage to the optical components.
Innovation Solution
A glass layer with a selectively weakened area overlying optical components, achieved through laser-induced damage features or deposited thin-films, is designed to reduce the strength of this area relative to the surrounding regions, preventing excessive fracturing and maintaining system reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass layers are used to protect optical components, then protection and structural integrity are improved, but excessive fracturing occurs during impact events due to the glass's inherent brittleness and high modulus of elasticity
Solution Approach 1:
The patent applies local quality by creating a selectively weakened area directly over the optical component window region. This area has reduced strength compared to the surrounding glass, allowing it to fracture in a controlled manner during impact events. The controlled fracturing prevents excessive glass shattering that would otherwise damage the optical components, while the rest of the glass layer maintains its protective function.
Solution Approach 2:
The patent implements preliminary action by pre-creating a weakened area in the glass layer before any impact event occurs. This weakened area is formed through laser-induced damage features or deposited thin-films that reduce the glass strength in the critical optical component region. When an impact occurs, this pre-prepared area is designed to fracture first, preventing catastrophic glass failure and protecting the optical components.
2Stability of the object's composition
If the glass layer is made stronger to prevent fracturing, then structural integrity is improved, but the glass becomes more prone to catastrophic failure during impact events
Solution Approach 1:
The patent resolves this contradiction by applying local quality differentially across the glass layer. The area over the optical component is selectively weakened to fracture controllably during impact, while the surrounding areas maintain full glass strength to provide structural integrity and prevent catastrophic failure. This spatial differentiation allows the glass to be strong where needed for structure and weak where needed for controlled failure.
Solution Approach 2:
The patent converts the harmful effect of glass brittleness into a beneficial controlled failure mechanism. By creating a selectively weakened area, the patent allows the glass to fracture in a predictable, controlled manner during impact events, transforming the harmful brittleness into a protective feature that prevents uncontrolled catastrophic failure and protects optical components.
3Reliability
If the glass layer is made weaker to prevent catastrophic failure, then impact safety is improved, but the glass loses structural integrity and protective function
Solution Approach 1:
The patent applies local quality to distinguish between the optical component window area and the surrounding glass. The window area is selectively weakened to fracture controllably during impact, ensuring system reliability by preventing damage to optical components. The surrounding glass maintains full strength to preserve structural integrity and protective function, demonstrating that localized weakening does not compromise overall system reliability.
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 effectively minimizes excessive fracturing in the glass layer's optical component window area, ensuring the optical components remain operational even after impact, while maintaining sufficient strength in non-overlapping areas to prevent catastrophic failure.
Implementation Method 1
Selective weakening of the first area may be provided using laser-induced-damage features
Implementation Method 2
deposited thin-films such as physical vapor deposition of thin-film inorganic dielectric
Data Source
AI summary
A system may have a support structure and a glass layer that separate an exterior region surrounding the system from an interior region. Components may be mounted in the interior region. The components may include an optical component. The glass layer may have a first area that overlaps the optical component and that serves as an optical component window for the optical component. The glass layer may also have a second area that surrounds the first area and does not overlap the optical component. The first area may be selectively weakened relative to the second area to prevent excessive glass fracturing during a damage event from obscuring the optical component. Selective weakening may be provided with laser-induced-damage features, recesses from local thinning, and/or glass-weakening deposited thin films such as physical vapor deposition thin-film coatings of inorganic dielectric.