Shunt Resistor Fixing Structure for Electronic Devices
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Solution Overview
Problem
The challenge is to downsize electronic devices with shunt resistors while preventing variations in resistance values, which are difficult to achieve when using screws for fixation due to size constraints and potential backlash issues.
Innovation Solution
A shunt resistor fixing structure using a connector, circuit board, and case with protrusions and a base, where the shunt resistor is interposed between the base and protruding parts, allowing for secure engagement without screws, utilizing an elastically deformable material to prevent misalignment and resistance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shunt resistor is fixed with screws, then the shunt resistor can be securely mounted, but the size of the electronic device becomes large and requires additional bearing surfaces
Solution Approach 1:
The invention extracts the screw fixation mechanism from the mounting structure and replaces it with a snap-fit connector system. The connector is integrated into the circuit board, eliminating the need for separate screws and bearing surfaces, thereby reducing device size while maintaining secure mounting through elastic engagement.
Solution Approach 2:
The connector is merged with the circuit board structure, combining the electrical connection function and mechanical fixation function into a single integrated component. This eliminates the need for separate fixation elements like screws and reduces the overall mounting space required.
2Ease of manufacture
If the shunt resistor is fixed with screws, then the shunt resistor can be mounted, but backlash occurs causing displacement of contact points and variation in resistance value
Solution Approach 1:
The invention replaces the mechanical screw fixation system with an elastic snap-fit connector system. The elastic material provides continuous contact pressure without backlash, ensuring stable electrical connection and preventing displacement of contact points that would occur with threaded fasteners.
Solution Approach 2:
The invention changes the fixation mechanism from rigid screw threads to elastic deformation. The elastic material deforms to engage with the shunt resistor and maintains constant contact pressure, eliminating the backlash inherent in threaded connections and ensuring precise positioning of contact points.
3Volume of moving object
If a connector is installed on the circuit board instead of mounting the shunt resistor directly, then the electronic device can be downsized, but additional components and assembly steps are required
Solution Approach 1:
The connector is merged with the circuit board as an integrated structure, eliminating the need for separate connector components. This integration reduces part count and assembly complexity while maintaining the space-saving benefits of the connector-based mounting system.
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 solution enables easy downsizing of electronic devices, prevents resistance variations, reduces costs, and makes the devices lighter and more cost-effective by eliminating the need for screw-bearing surfaces and slide structures, while providing firm fixation and preventing shunt resistor slippage.
Implementation Method 1
The case is integrally formed from an elastically deformable material
Data Source
AI summary
An electronic device includes: a connector that is to be electrically connected to a shunt resistor; a circuit board electrically connected to the connector; and a case within which the circuit board is provided and which has, at an outer side of the case, a base on which the shunt resistor is to be mounted and a protruding part provided apart from the base, the protruding part has a first protrusion on a leading end of the protruding part, and the base and the protruding part are to hold the shunt resistor interposed therebetween, and the first protrusion is to engage with the shunt resistor, whereby the shunt resistor is to be fixed in a state where the shunt resistor is connected to the connector.