Interconnection Substrate Barcode via Resin-Filled Penetrating Holes
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Solution Overview
Problem
Conventional barcodes on interconnection substrates become unreadable after an insulating layer and/or interconnection layer is formed, as conventional optical barcode readers cannot detect the barcode cells and background due to color tone and surface unevenness.
Innovation Solution
An interconnection substrate with a barcode featuring penetrating holes through the core layer in some cells, filled with resin, where the first end face of the resin is exposed on the same side as the core layer, allowing the interconnection layer to be in the surrounding area but not over the end face, and having fewer additional interconnection layers on the end face compared to the surface area, enabling scanning with light or X-ray exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating layer and interconnection layer are formed on the barcode, then the substrate structure is completed for manufacturing, but the barcode becomes unreadable by conventional optical readers
Solution Approach 1:
The patent transitions from a two-dimensional surface barcode to a three-dimensional structure by forming penetrating holes through the core layer and filling them with resin. This vertical dimension allows the barcode to remain detectable through X-ray imaging even after insulating and interconnection layers are formed on the surface.
Solution Approach 2:
The patent changes the detection parameter from optical reflection (surface-based) to X-ray transmission (volume-based). By creating resin-filled holes with different density than the surrounding materials, the barcode becomes visible through X-ray imaging, allowing reading after lamination of additional layers.
2Measurement precision
If penetrating holes are filled with resin to create barcode contrast, then X-ray scanning becomes possible, but the manufacturing process complexity increases
Solution Approach 1:
The barcode structure is formed early in the manufacturing process by creating penetrating holes in the core layer before adding insulating and interconnection layers. This preliminary formation allows the barcode to be established as part of the base structure, simplifying subsequent manufacturing steps.
Solution Approach 2:
The resin-filled penetrating holes serve multiple functions: they create the barcode pattern for identification, provide structural support within the core layer, and enable X-ray detection capability. This multi-functionality reduces the need for separate barcode application steps.
3Ease of manufacture
If the barcode is formed by surface engraving, then the manufacturing process is simple, but the barcode cannot be read after lamination of insulating and interconnection layers
Solution Approach 1:
The patent moves the barcode from a surface-level feature to a through-depth feature by creating penetrating holes that extend through the core layer. This vertical integration ensures the barcode remains accessible for detection even after surface layers are added.
Solution Approach 2:
The resin material acts as an intermediary that provides contrast for X-ray detection while being compatible with the surrounding materials. It fills the penetrating holes to create a detectable pattern without interfering with the electrical or structural functions of the insulating and interconnection layers.
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 barcode remains readable throughout the manufacturing process, including after lamination, as it can be scanned using either a typical light-based barcode reader or X-ray exposure, ensuring effective process control.
Implementation Method 1
emitting X-ray onto the barcode to scan the barcode after filling the penetrating holes with the resin, after forming the interconnection layer and the insulating layer over the first surface of the core layer, and after forming the one or more additional interconnection layers over the insulating layer
Data Source
AI summary
An interconnection substrate having a barcode includes a core layer, an interconnection layer over a first surface of the core layer, an insulating layer to cover the interconnection layer, and one or more additional interconnection layers over the insulating layer, wherein the barcode includes cells arranged at spaced intervals, and a cell pattern is made by forming penetrating holes through the core layer in some of the cells but not in remaining ones of the cells, wherein the penetrating holes are filled with resin, and an end face of the resin is exposed on the same side as the first surface such that the interconnection layer is situated in a surrounding area of the end face but not over the end face, and wherein a number of interconnection layers over the end face is smaller than a number of interconnection layers in the surrounding area of the end face.