Lever-Magnet Input Sensing for Minute Lateral Movement Detection
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Solution Overview
Problem
Existing input devices face difficulties in detecting minute lateral movements due to the equal lengths from the rotation center to the operating unit and the magnet, limiting their ability to accurately sense fine operations.
Innovation Solution
The input device incorporates a lever with a magnet on one end and a magnetic sensor, where the length from the rotation center to the magnet is greater than the length to the lever's first end portion, allowing for amplified movement detection by rotating the lever and increasing the change in magnetic flux for minute lateral movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the length from the rotation center to the magnet is made equal to the length from the rotation center to the operating unit, then the structure is simplified, but the ability to detect minute lateral movements is reduced
Solution Approach 1:
The patent applies asymmetry by making the distance from the rotation center to the magnet (second length) greater than the distance from the rotation center to the first end portion (first length). This asymmetric configuration creates a lever arm effect where the magnet travels a longer arc distance than the operating unit for the same rotation angle, thereby amplifying the detection signal and improving measurement precision without complicating the overall structure
2Measurement precision
If the length from the rotation center to the magnet is increased, then the detection sensitivity is improved, but the device size increases
Solution Approach 1:
The patent resolves the size-sensitivity contradiction by transitioning from linear displacement detection to rotational motion detection. The operating unit's lateral movement is converted into rotation of the tilting body, and the magnet's rotational path creates a larger effective detection distance without increasing the linear footprint of the device. The magnetic sensor detects changes in magnetic flux along the rotational arc, effectively utilizing the second dimension (rotation) to achieve high sensitivity within a compact form factor
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 enables reliable detection of slight movements of the operating body in the lateral direction, enhancing the device's sensitivity and accuracy in sensing operations.
Implementation Method 1
the movement of a magnet on the lower end of the tilting body in the rotation direction is detected by a magnetic sensor
Data Source
AI summary
An input device includes an operating body that moves through an operation performed by an operator, a movable portion that slides in accordance with movement of the operating body, a lever including a first end portion that engages with the movable portion, a rotation center, a second end portion located on an opposite side of the rotation center from the first end portion, and a magnet provided on the second end portion, where the lever rotates in accordance with sliding of the movable portion, and a magnetic sensor disposed facing the magnet. A second length from the rotation center of the lever to the magnet is greater than a first length from the rotation center to the first end portion of the lever.