Stacked Substrate Bonding Using Curvature-Based Misalignment Prediction
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Solution Overview
Problem
Existing stacked substrate manufacturing methods often face misalignment issues due to differences in curvature and distortion between substrates, leading to inadequate bonding and potential electrical conduction failures.
Innovation Solution
A method and apparatus that determine whether substrates satisfy a predetermined condition based on curvature information, aligning them precisely using a bonding unit, and correcting distortions through substrate holders and actuators to ensure accurate bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If substrates are bonded without checking curvature conditions, then bonding process is simple and fast, but misalignment occurs between substrates
Solution Approach 1:
The patent applies preliminary action by measuring the curvature of substrates before bonding and determining whether they satisfy predetermined conditions. This advance assessment prevents misalignment issues from occurring during bonding, ensuring high alignment precision without adding complex real-time control systems during the bonding process itself.
Solution Approach 2:
The patent implements feedback by using measured curvature information to determine whether substrates meet bonding conditions. The curvature measurement results feed into a decision-making process that controls whether bonding proceeds, ensuring that only substrates with appropriate curvature characteristics are bonded, thereby maintaining high alignment precision.
2Manufacturing precision
If curvature measurement and condition checking are performed before bonding, then alignment precision is improved, but processing time increases
Solution Approach 1:
The curvature measurement and condition determination are performed as preliminary actions before the bonding process. By completing these assessments in advance, the patent ensures that only substrates meeting the predetermined curvature conditions proceed to bonding, thereby guaranteeing alignment precision while allowing the bonding itself to proceed efficiently without interruptions.
Solution Approach 2:
The patent extracts the curvature measurement and condition checking steps as separate preliminary operations from the main bonding process. This separation allows for efficient processing where only substrates meeting the conditions enter the bonding stream, reducing waste of time on incompatible substrates while maintaining high alignment precision for those that qualify.
3Strength
If substrates with different curvature are bonded, then bonding process is simple, but bonding strength and electrical conduction are insufficient
Solution Approach 1:
The patent uses feedback from curvature measurements to determine whether substrates satisfy predetermined conditions for bonding. This feedback mechanism ensures that only substrates with compatible curvature characteristics are bonded together, guaranteeing strong bonding strength and proper electrical conduction while avoiding the need for complex real-time adjustment systems during the bonding process.
Solution Approach 2:
The patent replaces complex mechanical alignment and adjustment systems with a measurement-and-selection approach. By measuring curvature and selecting compatible substrate pairs beforehand, the system achieves strong bonding strength without requiring complex mechanical control systems during the actual bonding process.
4Reliability
If alignment is performed without curvature consideration, then processing is fast, but misalignment and bonding failures occur
Solution Approach 1:
The patent performs curvature measurement and condition determination as preliminary actions before alignment and bonding. This advance preparation ensures high bonding reliability by preventing misalignment and bonding failures, while the streamlined selection process maintains processing efficiency by quickly identifying suitable substrate pairs without requiring complex real-time adjustments.
Solution Approach 2:
The patent implements feedback by using curvature measurement results to control the bonding decision process. This feedback mechanism ensures that only substrates meeting the predetermined conditions proceed to bonding, thereby guaranteeing high bonding reliability while maintaining processing efficiency through automated decision-making rather than manual intervention.
Data Source
AI summary
A method of manufacturing a stacked substrate by bonding a first substrate and a second substrate, including a step of determining, based on information about curving of each of the first substrate and the second substrate, whether or not the first substrate and the second substrate satisfy a predetermined condition, and, a step of bonding the first substrate and the second substrate if the predetermined condition is satisfied. The stacked substrate manufacturing method described above includes a step of estimating, based on the information, an amount of misalignment which occurs after the first substrate is bonded to the second substrate and the predetermined condition may include that the amount of misalignment is equal to or less than a threshold.