Metallic Rigid Board for SMT Mounting and EMI Shielding
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Solution Overview
Problem
Handheld electronic devices face challenges in securely mounting and isolating components due to unique housing shapes and electromagnetic interference, with connectors disengaging during shocks and drops, and requiring effective acoustic and mechanical seals.
Innovation Solution
The use of a metallic rigid board for SMT mounting and electromagnetic shielding, adhesive connection of flexes to secure connectors, and a combination of hard and soft materials for seals that match arbitrary shapes and absorb forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid board is used for SMT mounting and electromagnetic shielding, then component mounting stability and electromagnetic interference protection are improved, but device complexity increases
Solution Approach 1:
The patent combines the rigid board's functions as both an SMT mounting surface and an electromagnetic shield by selecting a metallic material that provides both structural rigidity for component attachment and electromagnetic shielding properties, eliminating the need for separate shielding components
Solution Approach 2:
The rigid board is designed to perform multiple functions simultaneously: providing a rigid mounting surface for SMT components, serving as an electromagnetic interference shield, and contributing to the overall structural integrity of the device housing
2Adaptability or versatility
If connectors are positioned to interact with separate circuit boards or flexes, then device functionality is improved, but connector reliability deteriorates during shock or drop events
Solution Approach 1:
The patent applies adhesive around the connectors to pre-secure them in a coupled position before shock or drop events occur, creating a protective bond that prevents disengagement during accidental impacts
Solution Approach 2:
The adhesive is applied in advance to permanently bond the flexes or circuit boards together, securing the connectors in their coupled position before any shock or drop event occurs, eliminating the need for mechanical retention mechanisms
3Ease of manufacture
If a single hard material is used to match arbitrary housing shapes, then manufacturing ease is improved, but mechanical seal reliability deteriorates under applied forces
Solution Approach 1:
The patent uses a combination of a hard material molded to match the arbitrary shape of the housing and a soft material that deflects and absorbs applied forces, creating a composite seal structure that maintains both manufacturability and reliability
Solution Approach 2:
The seal structure employs different materials with different properties in different regions: the hard material provides the precise geometric match to the housing shape, while the soft material provides the force-absorbing sealing contact surface
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 secure component mounting, prevents connector disengagement, and provides effective acoustic and mechanical isolation while accommodating complex device geometries.
Implementation Method 1
a metal can or shield may be placed around the component. To reduce the total space required by the component and shield in the device, the rigid board can be selected from a metallic material to simultaneously provide a rigid board for SMT mounting as well as a shield from electromagnetic interference
Implementation Method 2
the flexes or circuit boards can be connected using an adhesive around the connectors to secure the connectors in a coupled position
Implementation Method 3
a soft material operative to deflect and absorb applied forces to form a seal for the component
Data Source
AI summary
This is directed to several handheld device components to be placed in a handheld device, as well as methods or systems for mounting or retaining components within the device. In particular, this is directed to a rigid shield used in an SMT process and securing connected flex connectors by adhering the flexes together. This is also directed to using foam in combination with a hard material to create an acoustic seal, or several layers of foam to create an acoustic and mechanical seal. This is also directed to selectively folding a sheet of material placed around a battery cell.