Columnar Flexure Pointing Device for Compact Multidirectional Sensing
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Solution Overview
Problem
There is an increasing demand for a pointing device with a high freedom degree of design to efficiently fit within smaller electronic devices such as notebook computers and game machines.
Innovation Solution
A pointing device is designed with a columnar operation part and strain gauges attached to detect operation amounts in orthogonal directions, allowing for efficient space utilization and strain detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional pointing device with a rod-shaped operation part and flexure part is used, then strain detection is achieved, but the device occupies significant space and has limited design freedom
Solution Approach 1:
The operation part and flexure part are merged into a single integrated structure. The columnar operation part itself functions as the flexure element, eliminating the need for a separate rod-shaped operation part and traditional flexure part combination. This integration reduces the overall device volume while maintaining the strain detection function, as the operation part's own deformation is directly measured by the strain gauges.
Solution Approach 2:
The operation part is designed as a columnar structure extending in the vertical direction (third direction orthogonal to both first and second directions), allowing strain detection in multiple orthogonal directions (first and second directions). This dimensional arrangement enables compact space utilization while maintaining the ability to detect operations in multiple directions, improving design freedom without increasing device volume.
2Measurement precision
If strain gauges are attached to detect operation amounts in orthogonal directions, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
Strain gauges are strategically attached at specific locations on the columnar operation part to detect strains in orthogonal directions (first and second directions). By placing sensors at optimal positions where strain manifestations are most distinct for each direction, accurate multi-directional detection is achieved without requiring complex sensor arrangements or additional structural elements, thus maintaining simplicity while improving measurement precision.
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 device achieves a high freedom of design, enabling compact and stable integration within limited spaces while improving strain detection accuracy and operational flexibility.
Implementation Method 1
detects an operation amount by the operator based on a strain generated in the flexure part when the operator operates the operation part
Implementation Method 2
a second strain sensing part attached to the operation part and configured to detect a strain corresponding to the operation amount in the second direction
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
A pointing device (100) detecting at least an operation amount in a first direction and an operation amount in a second direction orthogonal to the first direction includes an operation part as a columnar flexure element (12) operated by an operator and extending from one end (12b) fixed to a base member (11, 20) in a third direction orthogonal to the first direction and orthogonal to the second direction, a first strain sensing part (SS) attached to the operation part and configured to detect a strain corresponding to the operation amount in the first direction, and a second strain sensing part (SS) attached to the operation part and configured to detect a strain corresponding to the operation amount in the second direction.