Exposed Conductive Spring for Mobile Device Frame Impedance Testing
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Solution Overview
Problem
Conventional mobile communication devices face manufacturing difficulties due to the need for pre-drilled apertures for conductive elements, which are then covered and difficult to test for complete electrical connections and impedance, making it challenging to ensure the connection impedance between the metal inner and outer frames is within a predetermined range.
Innovation Solution
A mobile communication device design that uses conductive springs with exposed portions to connect the metal inner and outer frames, allowing for easier detection and adjustment of connection impedance, and includes a plastic frame body with locking and inserting grooves to secure the frames and springs, ensuring electrical connections and impedance testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive elements are embedded in the plastic frame body and covered by metal frames, then the electrical connection between metal inner and outer frames is achieved, but the manufacturing complexity increases due to pre-drilled apertures and the testing difficulty increases as the conductive elements become inaccessible
Solution Approach 1:
The conductive spring is extracted from the conventional embedded configuration and repositioned to extend outward from the plastic frame body. Specifically, the conductive spring connects the metal inner frame and metal outer frame while having an exposed portion that protrudes from the plastic frame body, making it accessible for testing without requiring pre-drilled apertures or complete embedding within the plastic frame body.
2Reliability
If conductive elements are completely covered by metal outer frame and plastic frame body, then the electrical connection is established, but the testing personnel cannot detect the connection impedance or determine which conductive element has incomplete connection
Solution Approach 1:
The conductive spring is extracted from the completely embedded configuration and repositioned to extend outward from the plastic frame body. The exposed portion of the conductive spring protrudes from the plastic frame body, making it accessible for testing personnel to detect connection impedance and identify incomplete connections without disassembling the device.
3Reliability
If multiple conductive elements are used to connect metal inner and outer frames, then the electrical connection is established, but the testing personnel cannot determine which specific conductive element causes abnormal connection impedance
Solution Approach 1:
The conductive spring is extracted from the completely embedded configuration and repositioned to extend outward from the plastic frame body. Each conductive spring has an exposed portion that can be individually accessed and tested, allowing testing personnel to identify which specific conductive spring causes abnormal connection impedance by testing each exposed portion separately.
4Ease of manufacture
If apertures are pre-drilled in the plastic frame body for conductive elements, then the conductive elements can be installed, but the manufacturing process becomes more difficult and time-consuming
Solution Approach 1:
The conductive spring is extracted from the conventional configuration requiring pre-drilled apertures and repositioned to extend outward from the plastic frame body. This eliminates the need for pre-drilling apertures in the plastic frame body, simplifying the manufacturing process and improving production efficiency while still allowing conductive element installation.
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 exposed conductive springs enable testing of connection impedance and facilitate adjustment to maintain the impedance within a predetermined range, improving manufacturing efficiency and transmission quality by preventing resonance interference with the antenna module.
Implementation Method 1
the metal outer frame and the metal inner frame are electrically connected with each other via a conductive element
Implementation Method 2
a first conductive spring clasping a first protrusive portion and extending into a locking groove and an inserting groove
Data Source
AI summary
A mobile communication device is provided and includes a plastic frame body, a metal outer frame, a metal inner frame and a first conductive spring. The plastic frame body has an opening, a first locking groove, a first inserting groove and a first protrusive portion formed between the first locking groove and the first inserting groove. The metal outer frame is locked to the first locking groove and fixed on the outside of the plastic frame body. The metal inner frame is inserted into the first inserting groove and fixed in the surroundings of the opening of the plastic frame body. Besides, the metal inner frame is electrically connected to a system ground plane. The first conductive spring clasps the first protrusive portion. The first conductive spring extends into the first locking groove and the first inserting groove so as to electrically connect the metal outer and inner frames.