Inclined Multi-Dome Reaction Force Unit for Stable Handle Feedback
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Solution Overview
Problem
Existing reaction force generation units with multiple domes pressed by a common member face instability in reaction force magnitude and timing due to varying axial inclinations, making accurate processing and durability challenging.
Innovation Solution
A reaction force generation unit with domes having axes that are initially parallel and form a predetermined angle with the opposing surface, ensuring stable axial inclination and balanced reaction force generation, facilitating accurate molding and enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If domes are designed with different axial inclinations to achieve stable reaction force, then reaction force stability is improved, but manufacturing complexity and cost increase due to difficulty in molding multiple domes with different axial directions
Solution Approach 1:
The patent changes the axial inclination parameter of domes from being perpendicular to the board surface to being inclined at a predetermined angle relative to the normal direction of the opposing surface. This parameter change allows all domes to have the same axial direction in the natural state, enabling simple molding while achieving stable reaction force when pressed, as the inclined axes rotate to become perpendicular to the opposing surface during compression.
2Stability of the object's composition
If domes are designed with different axial inclinations for each position, then landing behavior stability is improved, but processing accuracy decreases due to difficulty in molding with high precision
Solution Approach 1:
The patent applies parameter change by setting all dome axes parallel to each other at a predetermined inclination angle relative to the normal direction of the opposing surface in the natural state. This uniform parameter setting simplifies the molding process and improves processing accuracy, while the rotational movement during pressing ensures stable landing behavior as the axes become perpendicular to the opposing surface.
Solution Approach 2:
The patent implements preliminary action by pre-inclining the dome axes at a predetermined angle before the pressing operation. This preliminary inclination is designed so that when the domes are pressed, their axes automatically rotate to become perpendicular to the opposing surface, ensuring stable landing behavior without requiring complex post-processing or adjustment.
3Ease of manufacture
If domes are made with axes perpendicular to the board surface, then molding is simplified, but reaction force stability deteriorates due to large axial inclination changes during pressing
Solution Approach 1:
The patent reverses the conventional approach by changing the dome axis inclination from perpendicular to the board surface to inclined at a predetermined angle relative to the normal direction of the opposing surface. This parameter change simplifies molding while improving reaction force stability, as the pre-inclined axes rotate to become perpendicular to the opposing surface during pressing, minimizing axial inclination changes at the critical contact moment.
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 solution stabilizes reaction force generation and processing accuracy by balancing the axial inclinations of domes, reducing instability and improving durability, while allowing for high-accuracy manufacturing.
Implementation Method 1
a pressed body (20) formed of an elastic material... When the base (21) is pressed by a pressing member (13), each of the plurality of domes (22) is elastically deformed and generates a reaction force
Data Source
AI summary
A reaction force generation unit includes an opposing member and a pressed body, which includes a base and domes, including a first dome, a second dome, and a third dome, bulging from the base. A leading end of each dome faces an opposing surface of the opposing member. When the pressing member presses the base, the leading ends of the domes move in a direction relatively close to the opposing member, where the domes become elastically deformed and cause an appropriate reaction force with respect to the handle. In a natural state where the pressed body is not subjected to any pressing force, axes of the domes are substantially parallel to each other, and acute angles formed by the axes and a normal line of the opposing surface are substantially similar to each other at a predetermined angle larger than zero degree.