Shield Case With Outer Metal Plate For Resin Base
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Solution Overview
Problem
Existing shield cases made of nonmetal materials face challenges in machining and increased manufacturing costs due to the difficulty of incorporating metal plates for shielding, especially when a metal plate with a shape that avoids cooling passages is required, which compromises the shielding property.
Innovation Solution
A shield case design featuring a base portion made of nonmetal material with a metal cover portion and a metal plate abutting its outer surface, where the metal plate projects outward and is fastened jointly with the cover portion and base portion using a bolt, allowing for easy machining and improved shielding without obstructing cooling passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal plate is provided inside the resin base portion to improve shielding property, then the shielding effectiveness improves, but machining difficulty increases and manufacturing cost increases
Solution Approach 1:
The metal plate is extracted from the interior of the base portion and repositioned to abut against the outer surface of the base portion. This allows the metal plate to be separately positioned and fastened using a bolt, eliminating the need for complex internal machining operations while maintaining shielding effectiveness.
Solution Approach 2:
The shielding structure is segmented into separate components: the base portion, the metal plate, and the cover portion. These segments are assembled together using a bolt, allowing each component to be manufactured and machined independently, thereby simplifying the overall manufacturing process.
2Object-affected harmful factors
If a metal plate with shape avoiding cooling passages is provided inside the base portion, then shielding property improves, but the shielding effectiveness decreases due to gaps
Solution Approach 1:
The metal plate is made movable relative to the base portion through the bolt fastening system, allowing the plate to be pressed tightly against the outer surface of the base portion. This dynamic adjustment eliminates gaps between the metal plate and base portion, ensuring complete shielding coverage without compromising cooling passage functionality.
Solution Approach 2:
The metal plate is pre-positioned to abut against the outer surface of the base portion before final assembly with the cover portion. This preliminary positioning ensures that the shielding structure is already in place and properly aligned, preventing any gaps from forming during subsequent assembly operations.
3Reliability
If the base portion is made of nonmetal material for insulation, then electrical insulation improves, but shielding property deteriorates
Solution Approach 1:
The shield case employs a composite structure combining nonmetal base portion material (for electrical insulation) with metal plate and metal cover portion materials (for electromagnetic shielding). This composite approach allows each material to fulfill its optimal function: the nonmetal base provides insulation while the metal components provide shielding, achieving both requirements simultaneously.
Solution Approach 2:
Different parts of the shield case are assigned different material properties according to their specific functional requirements. The base portion uses nonmetal material where electrical insulation is critical, while the cover portion and external plate use metal materials where electromagnetic shielding is the primary concern. This localized material selection optimizes overall system performance.
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 design facilitates easy machining, reduces manufacturing costs, and maintains excellent shielding properties even when the base portion is made of nonmetal material, ensuring complete coverage of the electronic component with metal members.
Implementation Method 1
the shield case prevents an electromagnetic wave generated from the electronic component from being radiated to outside the case and prevents the electromagnetic wave from entering the case from outside the case
Implementation Method 2
a cover portion (4) made of a metal material and covering surroundings of the electronic component
Data Source
AI summary
A shield case including a base portion made of a nonmetal material and having a mounting surface on which the electronic component is mounted, a cover portion made of a metal material and covering surroundings of the electronic component and a metal plate abutting with an outer surface of the base portion and having an end portion projecting outward from the base portion. A side-wall end portion of the cover member includes a first end abutting with the mounting surface of the base portion, and a second end extending in a thickness direction of the base portion and abutting with the end portion of the metal plate.