Electronic Device Casing with Raised Component Attachment and Elastic Closure
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Solution Overview
Problem
Existing configurations for fixing electronic device components without posts often require additional components to enhance EMC and prevent foreign substances, leading to increased component counts and costs, and can trap metal chips during screwing.
Innovation Solution
A casing design using a first sheet metal member with a cut and raised component attachment part and a second sheet metal member with an elastic piece that closes the opening part, allowing components to be fixed without posts, enhancing EMC and preventing foreign substances without additional members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a post is used to fix components to the casing, then component fixation is achieved, but the number of components and cost increase
Solution Approach 1:
The patent merges the component fixation function directly into the casing structure by forming a component attachment part through cutting and raising a portion of the casing. This eliminates the need for separate posts or fasteners, as the casing itself provides the fixation mechanism through its raised structure that engages with the component.
Solution Approach 2:
The casing is designed to serve multiple functions: it provides structural enclosure, component mounting, and grounding simultaneously. The component attachment part formed by cutting and raising the casing material creates a multi-functional element that integrates fixation and structural support without requiring additional specialized components.
2Quantity of substance
If the sheet metal frame is cut and raised to fix the circuit board directly, then the number of components is reduced, but a dedicated cover member is required to close the hole and enhance EMC
Solution Approach 1:
The patent combines the cover function and EMC shielding function into the side faces of the casing structure. The side faces are formed by bending sheet metal members that naturally close the openings created by the cut-and-raised attachment parts, eliminating the need for separate cover members while maintaining EMC performance.
Solution Approach 2:
The side faces of the casing perform multiple functions simultaneously: they provide structural enclosure, close the openings to prevent foreign substance intrusion, and maintain EMC shielding. This multi-functionality is achieved through the integrated sheet metal construction that forms both the enclosure and the closure without requiring additional specialized components.
3Reliability
If a conductive gasket is provided to enhance EMC between sheet metal frames, then EMC is improved, but the number of components and cost increase
Solution Approach 1:
The patent merges the EMC shielding function directly into the sheet metal frames themselves through their conductive material properties and continuous structural design. The sheet metal members forming the casing and side faces provide inherent electromagnetic shielding without requiring separate conductive gaskets or additional EMC-specific components.
Solution Approach 2:
The sheet metal frames serve dual purposes: they provide the structural enclosure and simultaneously provide electromagnetic shielding. The conductive nature of the sheet metal material and its continuous construction enable it to function as both structural and EMC protection element, eliminating the need for separate conductive gaskets.
4Object-affected harmful factors
If a cover member is fit into the sheet metal frame to prevent foreign substances, then foreign substance intrusion is prevented, but metal chips produced during screwing are trapped within the internal space
Solution Approach 1:
The patent merges the closure function and chip discharge function into the integrated casing structure. The side faces formed by bending sheet metal members naturally close the openings to prevent foreign substance intrusion while simultaneously providing pathways or openings that allow metal chips to be discharged externally during the screwing process.
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
Enables component fixation without posts, improves EMC, prevents foreign substance intrusion, and reduces component count and cost by using existing casing members for assembly, while allowing metal chips to be discharged externally.
Implementation Method 1
a plate part which has an elastic piece having a free end and formed by cutting and raising from the second sheet metal member toward the inner side of the casing
Data Source
AI summary
A circuit board (7) is fixed with a screw (8), using a component attachment part (21) cut and raised from a bottom plate part (20) of a bottom chassis (2) toward the inner side of a casing (1). An opening part (22) formed by cutting and raising of the component attachment part (21) is closed by attachment of a rear chassis (5), and the bottom chassis (2) and the rear chassis (5) come into contact with each other via an elastic piece (52).