Substrate Curvature Bonding for Low-Distortion Alignment
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Solution Overview
Problem
Existing bonding technologies face challenges in accurately bonding substrates due to stress concentration and distortion, which affect the bonding accuracy and reliability of combined substrates.
Innovation Solution
A bonding apparatus equipped with a holder, a pressing member, and a curvature adjuster that gently curves the substrate to reduce stress concentration and distortion, using a combination of mechanical pressing and air supply to control the curvature and alignment of substrates for precise bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressing member presses the central portion of the substrate to allow protrusion, then bonding initiation is enabled, but stress concentration and distortion occur
Solution Approach 1:
The pressing member is divided into multiple pressing portions that contact different regions of the substrate. This segmentation distributes the pressing force across multiple points, preventing stress concentration at a single location and reducing substrate distortion while still enabling effective bonding initiation.
Solution Approach 2:
The pressing member is designed with varying pressing forces applied to different regions of the substrate. The central portion receives primary pressing force for bonding initiation, while peripheral pressing portions apply adjusted forces to compensate for substrate deformation, maintaining flatness and reducing distortion throughout the bonding process.
2Reliability
If the substrate is pressed to protrude the central portion, then bonding can start, but bonding accuracy decreases due to distortion
Solution Approach 1:
The substrate is pressed and curved into a predetermined shape before the actual bonding process begins. This preliminary action prepares the substrate for bonding initiation while the curvature adjuster maintains control over the substrate shape, ensuring that when bonding starts, the substrate is in the optimal configuration for accurate alignment and bonding.
Solution Approach 2:
The curvature adjuster dynamically adjusts the substrate curvature during the bonding process. By continuously monitoring and adjusting the substrate shape, the system maintains optimal bonding conditions throughout the process, compensating for any distortion that occurs and ensuring high bonding accuracy is maintained from initiation through completion.
3Reliability
If mechanical pressing is used to curve the substrate, then bonding is enabled, but stress concentration occurs
Solution Approach 1:
The pressing member is divided into multiple pressing portions that contact different regions of the substrate. This segmentation distributes the pressing force across multiple points, preventing stress concentration at a single location and reducing substrate distortion while still enabling effective bonding initiation.
Solution Approach 2:
The system adjusts pressing parameters such as force distribution, contact area, and pressing sequence to optimize stress distribution. By carefully controlling these parameters, the substrate is curved into the necessary shape for bonding while keeping stress concentration below thresholds that would cause damage or excessive 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 effectively suppresses distortion and improves bonding accuracy by reducing stress concentration and maintaining a balanced curvature, leading to enhanced reliability and precision in the bonding process.
Implementation Method 1
a holder (101) that attracts and holds a substrate (W1) to be bonded
Implementation Method 2
an air supply (103) that blows air toward the substrate (W1) pressed by the striker (102)
Data Source
AI summary
A bonding apparatus includes a holder; a pressing member; and a curvature adjuster. The holder is configured to attract and hold a substrate to be bonded. The pressing member is configured to come into contact with a central portion of the substrate attracted to and held by the holder and press the substrate to allow the central portion of the substrate to be protruded. The curvature adjuster is configured to adjust a curvature of the substrate pressed by the pressing member.