Rotary Shaver Motion Feedback for Large Linear Stroke Detection
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Solution Overview
Problem
Existing rotary shaver feedback systems fail to differentiate between unavoidable small linear motions and avoidable large linear motions, leading to inaccurate feedback that can distract users and reduce shaving performance.
Innovation Solution
A method and apparatus that utilize motion shape and size detection to provide differentiated feedback, distinguishing between large, avoidable linear motions and small, unavoidable motions, using a processing unit to generate feedback signals based on motion data from a sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback is provided for all linear motions, then user guidance on proper shaving technique is improved, but user distraction increases and shaving performance deteriorates
Solution Approach 1:
The patent applies local quality by providing differentiated feedback based on motion characteristics. Instead of uniform feedback for all linear motions, the system selectively provides feedback only for large linear motions that can be improved, while acknowledging small linear motions as unavoidable. This localized approach to feedback improves accuracy without causing user distraction.
2Productivity
If motion feedback is provided to guide users, then shaving performance is improved, but feedback complexity increases
Solution Approach 1:
The patent segments feedback into different types based on motion characteristics. The processing unit analyzes motion data and generates different feedback signals for different motion types (circular vs. linear, small vs. large). This segmentation allows the system to provide comprehensive guidance without overwhelming complexity, as each motion type receives appropriate targeted feedback.
3Manufacturing precision
If all linear motions are corrected, then shaving technique improvement is maximized, but skin irritation increases due to excessive feedback
Solution Approach 1:
The patent changes the parameter of feedback provision from binary (feedback or no feedback) to conditional (feedback based on motion size and type). By introducing size thresholds and motion type classification, the system provides feedback only when necessary (for large linear motions), avoiding excessive feedback that could cause skin irritation while still improving shaving technique precision.
Data Source
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AI summary
The present invention relates to a method (100) of controlling feedback to a user regarding motion of a rotary shaver performed by the user, the method comprising the steps of: obtaining motion data from a motion sensor (12) monitoring the motion of the rotary shaver (8) performed by the user; determining shape and size of the monitored motion based on the obtained motion data, the shape indicating if the monitored motion is circular or linear; and generating a control signal configured to trigger feedback of a first type to the user if the monitored motion is determined to be a linear motion having a size above a threshold and to trigger feedback of another type, different from the first type, to the user if the monitored motion is determined to be a circular motion or a linear motion having a size equal to or below the threshold.