Stiffener Cutout for IC Identification Code Visibility
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Solution Overview
Problem
Substrate warpage due to thermal expansion mismatches and the need for non-intrusive integration of identification codes on integrated circuit products, which can interfere with electrical contacts and stiffener structures, compromising product reliability and traceability.
Innovation Solution
Incorporating an identification code on the substrate near the perimeter with a stiffener structure that has a cutout in its outer perimeter, oriented to expose the code, creating a void region for visibility and detection, while maintaining the structural integrity and reducing warpage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If an identification code is placed on the substrate, then product traceability is improved, but the code may interfere with electrical contacts and stiffener structures, compromising product reliability
Solution Approach 1:
The identification code is positioned at the perimeter of the substrate, utilizing the outer boundary area that would otherwise be unused. This peripheral placement moves the code away from the central functional areas where electrical contacts and stiffener structures are located, eliminating interference while maintaining traceability.
Solution Approach 2:
The stiffener structure is segmented by introducing a cutout that exposes the identification code. This segmentation allows the stiffener to maintain its structural function while creating a localized opening that permits code detection without compromising overall reliability.
2Area of stationary object
If the identification code is placed near the perimeter of the substrate, then space for code detection is improved, but the code may still interact with stiffener structures
Solution Approach 1:
A cutout is extracted from the stiffener structure at the location where the identification code is positioned. This removal creates a clear exposure of the code while maintaining the stiffener's overall structural integrity, allowing code detection without interaction complications.
3Stability of the object's composition
If a stiffener structure is attached to the substrate, then substrate warpage is reduced, but the stiffener may obstruct visibility of the identification code
Solution Approach 1:
A cutout is removed from the stiffener structure at the perimeter location to expose the identification code. This extraction maintains the stiffener's warpage control functionality while creating a viewing window that eliminates obstruction, allowing both structural stability and code detectability.
4Difficulty of detecting and measuring
If the stiffener structure includes a cutout to expose the identification code, then code detectability is improved, but the stiffener structure may be weakened
Solution Approach 1:
The cutout is positioned at the perimeter of the stiffener structure where structural stresses are lower. This localized modification provides code exposure while minimizing impact on the overall strength and stiffness of the stiffener, as the cutout is placed in a region that contributes less to the primary load-bearing function.
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
Ensures proper detection and decode of the identification code without compromising substrate stiffness or warpage control, enhancing product reliability and traceability by providing sufficient space for code detection while maintaining effective stiffener functionality.
Implementation Method 1
Substrate warpage occurs due to a mismatch of coefficients of thermal expansion of the electrical components, underfill, and substrate
Implementation Method 2
attached to the substrate using an adhesive
Data Source
AI summary
An apparatus includes a substrate including an identification code on a first side of the substrate and near a perimeter of the substrate. The apparatus includes a stiffener structure attached to the first side of the substrate. The stiffener structure has a cutout in an outer perimeter of the stiffener structure. The stiffener structure is oriented with respect to the substrate to cause the cutout to expose the identification code. The cutout may have a first dimension and a second dimension orthogonal to the first dimension. The first dimension may exceed a corresponding first dimension of the identification code and the second dimension may exceed a corresponding second dimension of the identification code, thereby forming a void region between the identification code and edges of the stiffener structure.