Multi-Directional Input Sensing Layout for Accurate Tilt Detection
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Solution Overview
Problem
Conventional multi-directional input devices face challenges in maintaining detection accuracy due to the need for minimizing the distance between the magnet and magnetoelectric conversion elements, leading to minute rattling issues that affect the detection of tilting operations, especially when trying to reduce the product height.
Innovation Solution
The design incorporates a magnet holding member that is relatively movable only in the tilting direction, with magnetic sensors positioned on the sides of the magnet to detect magnetic components in three orthogonal directions, allowing for improved detection accuracy while minimizing product height by maintaining an appropriate distance between the magnet and sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the distance between the magnet and magnetoelectric conversion elements is minimized to reduce product height, then the product height is reduced, but minute rattling of the magnet is generated which adversely affects detection accuracy
Solution Approach 1:
The patent positions the magnetic sensors on the radial side surfaces of the magnet rather than directly below it, changing the spatial arrangement from a vertical configuration to a radial configuration. This dimensional change allows the sensors to be positioned at an appropriate distance from the magnet while maintaining a compact overall structure, thereby reducing product height without compromising detection accuracy or causing magnet rattling issues
2Measurement precision
If magnetic sensors are positioned to maintain appropriate distance from the magnet, then detection accuracy is improved, but product height increases
Solution Approach 1:
By arranging sensors on the radial side surfaces of the magnet, the patent utilizes the radial dimension rather than extending the vertical dimension. This allows adequate sensor-magnet spacing for accurate detection while keeping the overall product height compact, as the sensors are positioned laterally rather than vertically distant from the magnet
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 configuration enhances the detection accuracy of tilting operations by reducing the impact of magnet rattling and allows for a compact design without compromising detection precision.
Implementation Method 1
a magnetic sensor that is arranged at a position facing the magnet and detects a movement of the magnet. The magnetic sensor is disposed on a side of the magnet and can detect magnetic components in three axial directions orthogonal to one another
Data Source
AI summary
A multi-directional input device includes an operating member that protrudes from a case and can be tilted, a compression coil spring that returns the operating member to an initial state before a tilting operation, a magnet holding member that is relatively movable with respect to the operating member only in a direction along a protruding direction and is interlocked only in a tilting direction, a magnet arranged in the magnet holding portion, and magnetic sensors that are each disposed at a position facing the magnet and detect a movement of the magnet. The magnetic sensors are each disposed on a side of the magnet and can detect magnetic components in three axial directions orthogonal to one another.