Stepped Case Design for Substrate Protection
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Solution Overview
Problem
The existing electronic device configurations face challenges in reducing the mounting area while minimizing substrate damage due to the transmission of force from screws, which can lead to substrate damage depending on the screw hole position.
Innovation Solution
The electronic device incorporates a substrate with a case fixed using an adhesive material, featuring a stepped surface design where the interval between the case's short sides and the substrate's front surface is larger than the interval between the case's long sides and the substrate, dispersing the external force applied during screw tightening and reducing the risk of substrate damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the case is fixed to the substrate using screws through holes in the case, then the mounting area can be reduced, but the substrate may be damaged due to concentrated force transmission
Solution Approach 1:
The patent applies local quality by creating a stepped surface structure with different heights at different locations. The first stepped surface is at a first height while the second stepped surface is at a second height, allowing different regions of the case to be positioned at different distances from the substrate. This enables the force from screw tightening to be distributed across different areas, preventing concentration of force at single points that would damage the substrate.
Solution Approach 2:
The case is divided into multiple segments with different stepped surfaces at different heights. The first case portion with the first stepped surface and the second case portion with the second stepped surface create separate force transmission paths. This segmentation allows the mounting structure to distribute the tightening force across multiple discrete locations rather than concentrating it, reducing the risk of substrate damage while maintaining compact mounting area.
2Strength
If screws are used to fix the case to the substrate, then the structural strength is improved, but the substrate may be damaged depending on the hole position
Solution Approach 1:
The stepped surface structure acts as an intermediary between the screw fixing mechanism and the substrate. By positioning different case portions at different heights above the substrate, the structure mediates the force transmission, distributing the tightening force across multiple areas rather than concentrating it at single contact points. This intermediary arrangement maintains structural strength while preventing substrate damage.
3Area of stationary object
If the case is positioned close to the substrate to reduce mounting area, then the device size is minimized, but the force from screw tightening concentrates and damages the substrate
Solution Approach 1:
The patent introduces a vertical dimension (height) variation through the stepped surfaces, transforming a two-dimensional mounting problem into a three-dimensional solution. By varying the height of different case portions relative to the substrate, the design distributes force transmission in the vertical direction while maintaining a compact footprint in the horizontal plane. This dimensional approach allows close mounting area while preventing force concentration that would compromise substrate integrity.
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
This configuration effectively reduces substrate damage and minimizes the mounting area by dispersing the external force applied during screw tightening, thereby enhancing the performance and reliability of the electronic device.
Implementation Method 1
a case fixed to the substrate through an adhesive material
Data Source
AI summary
An electronic device includes: a substrate having an upper surface (front surface) on which a semiconductor chip is mounted, and a lower surface (back surface) opposite to the upper surface; and a housing (case) fixed to the substrate through an adhesive material. The housing has through-holes each formed on one short side and the other short side in an X direction. The substrate is disposed between the through-holes. A part of the upper surface of the substrate is fixed so as to face a part of a stepped surface formed at a height different from that of a lower surface of the housing. Further, an interval (distance) between a part (stepped surface) extending along a short side of the housing in the stepped surface and the upper surface of the substrate is larger than an interval (distance) between a part (stepped surface) extending along a long side of the housing in the stepped surface and the upper surface of the substrate.