Tuner Ground Structure Using Flexible Leg Elastic Contact
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Solution Overview
Problem
Conventional ground structures for tuners on metal chassis are bulky and complex due to the need for a ground plate that extends from the circuit board edge to the screw-fixed portion, making secure and easy grounding challenging.
Innovation Solution
A ground structure featuring a metal sleeve protruding from the tuner case, a flexible leg portion on the ground plate, and tongue pieces on the ground plate for elastic contact with the chassis, allowing secure grounding without increasing the ground plate size or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ground plate is made to extend from the circuit board edge to the screw-fixed portion, then secure grounding connection is achieved, but the ground plate becomes bulky and its shape becomes complicated
Solution Approach 1:
The ground plate is divided into three functional segments: a fitting portion that fits into the tuner case, a grounding portion that contacts the chassis, and a leg portion that connects both. This segmentation allows each part to be optimized independently, achieving reliable grounding without requiring a bulky extended plate.
Solution Approach 2:
The grounding function is achieved by transitioning from a two-dimensional extended plate to a three-dimensional structure utilizing vertical space. The leg portion extends downward from the circuit board plane to contact the chassis, eliminating the need for a large horizontal ground plate extension.
2Ease of manufacture
If the ground plate size is reduced to simplify the structure, then manufacturing and installation become easier, but secure grounding connection becomes difficult to achieve
Solution Approach 1:
The leg portion is designed with flexibility to elastically deform during installation. When the circuit board is fixed to the chassis with screws, the leg portion bends and makes elastic contact with the chassis, ensuring reliable grounding connection while keeping the ground plate compact and easy to manufacture.
3Ease of manufacture
If a simple ground plate structure is used, then manufacturing is easier, but the ground plate may become dislodged from the tuner
Solution Approach 1:
The fitting portion of the ground plate has an asymmetric cross-section with a rectangular outer shape and a square inner cavity. This asymmetric design provides directional stability, preventing the ground plate from rotating or dislodging from the tuner case while keeping the structure simple and easy to manufacture.
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 a simple and secure grounding connection between the tuner and chassis, maintaining electrical contact and preventing the ground plate from dislodging, thus simplifying the grounding process and reducing bulkiness.
Implementation Method 1
the flexible leg portion comes into elastic contact with the chassis
Implementation Method 2
a tongue piece, which elastically touches the outer surface of the sleeve
Data Source
AI summary
On a circuit board to be mounted on a metal chassis, a tuner having a metal sleeve protruding from a side of its case is mounted, with the sleeve protruding beyond an edge of the circuit board. A metal ground plate is fitted on the sleeve. With a flexible leg portion formed at a lower portion of the ground plate disposed on the chassis, the circuit board is fixed to the chassis with screws, thereby the leg portion comes into elastic contact with the chassis.