Asymmetric Acceleration Generator for Pseudo Force Sense
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Solution Overview
Problem
Conventional force sense generating methods for portable devices and wearable computers face challenges in providing a temporally stable force without a supporting point of reaction force or application of force, often resulting in inaccurate force direction and degradation of force sense due to unwanted force vectors.
Innovation Solution
An acceleration generator that performs periodic translational motion along a straight line, using first and second operating parts to apply forces in directions parallel to the line, with varying force magnitudes based on relative positions, ensuring asymmetric acceleration and minimizing force vectors in unintended directions, thereby providing a pseudo force sense without a supporting point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a link mechanism or non-circular gear mechanism is used to transmit rotational motive force, then a force sense can be generated, but a force vector occurs in a direction other than the intended direction, causing vibration and degradation of force sense provision capability
Solution Approach 1:
The patent extracts and eliminates the unwanted force vector component by using a linear motion mechanism instead of a rotational mechanism. The moving member moves linearly along the straight line without rotational components, thereby removing the source of unwanted force vectors that would otherwise be generated by link mechanisms or non-circular gear mechanisms.
Solution Approach 2:
Instead of converting rotational motion to linear motion (which generates unwanted force vectors), the patent inverts the approach by directly generating linear motion along a straight line. This inversion eliminates the intermediate rotational mechanisms that cause the harmful force vectors.
2Force
If conventional force sense generating methods are used, then a force sense can be provided, but the average physical force is not zero, requiring a supporting point of reaction force
Solution Approach 1:
The patent applies asymmetry in the force application timing and magnitude. The first operating part applies force during a first period and the second operating part applies force during a second period, with asymmetric timing and magnitude relationships. This asymmetric force application generates a net force sense while maintaining zero average physical force over the complete cycle, eliminating the need for external supporting points.
Solution Approach 2:
The patent uses periodic action with asymmetric timing. The first operating part operates during a first period and the second operating part operates during a second period within a complete cycle. This periodic asymmetric operation allows the generation of force sense while the average force over the complete cycle remains zero, eliminating the need for reaction force supporting points.
3Stability of the object's composition
If the moving member performs symmetric translational motion, then the motion is simple, but the force sense is not temporally stable
Solution Approach 1:
The patent introduces asymmetry in the acceleration profile while maintaining simple linear motion. The moving member performs translational motion with asymmetric acceleration characteristics - the acceleration magnitude and/or duration differs between the first period and second period. This asymmetric motion pattern generates temporally stable force sense without requiring complex mechanisms.
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
Enables a person to sense a temporally stable force in the intended direction while suppressing unwanted force vectors, enhancing the clarity and accuracy of the force sense, suitable for portable devices and wearable technology.
Implementation Method 1
the first operating part is configured to apply the first force to the moving member using an elastic force of a spring
Implementation Method 2
the second operating part is configured to apply the second force to the moving member using a magnetic force between a second permanent magnet and the moving member
Data Source
AI summary
An acceleration generator 20 includes: a moving member (21, 25) that performs a periodic translational motion along a particular straight line; a first operating part (24) that applies a first force that varies in magnitude depending on the relative position thereof with respect to the moving member to the moving member in a direction parallel to the particular straight line; and a second operating part (27) that applies a second force that varies in magnitude depending on the relative position thereof with respect to the moving member to the moving member in a direction parallel to the particular straight line. The moving member performs a translational motion in which the acceleration thereof in the positive direction and the acceleration thereof in the negative direction are asymmetric in one period.