Optical Joystick Mark Pattern for Precise Gesture Detection
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Solution Overview
Problem
Conventional optical joysticks struggle to accurately determine the rotation direction, shifting position, and initial position of the control bar due to symmetric or asymmetric identification marks, leading to inaccuracies in gesture analysis.
Innovation Solution
A joystick design featuring a casing with a movable stick body, an identification mark comprising crossed line groups of different widths, and an optical sensor that analyzes feature variations to determine the stick body's gesture, using a matrix of sensing units to capture and analyze overlapped regions and connection lines for precise direction and amplitude determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a symmetric identification mark is used, then the manufacturing is simplified, but the optical sensor cannot accurately decide the rotation direction of the control bar
Solution Approach 1:
The patent applies asymmetry by designing the identification mark with a specific asymmetric pattern consisting of multiple lines with different widths. This asymmetric structure enables the optical sensor to accurately determine rotation direction by detecting changes in the pattern's appearance during rotation, while maintaining manufacturing simplicity through a straightforward line-based design.
2Measurement precision
If an asymmetric identification mark is used, then the rotation direction can be determined, but the optical sensor cannot accurately decide the shifting position and initial position when the joystick is fiercely moved
Solution Approach 1:
The identification mark is segmented into multiple distinct lines with different widths arranged in a specific pattern. This segmentation allows the optical sensor to detect position changes more reliably by tracking the relative positions and orientations of individual line segments, even during sudden or fierce movements of the joystick.
Solution Approach 2:
The patent enhances position determination by analyzing the identification mark in multiple dimensions - both the spatial arrangement of lines and their orientation angles. This multi-dimensional analysis enables reliable detection of shifting position and initial position even under sudden movements, overcoming the limitations of simple asymmetric patterns.
3Device complexity
If a conventional identification mark is used, then the device complexity is reduced, but the optical sensor cannot accurately determine the initial position of the control bar
Solution Approach 1:
The identification mark is pre-configured with a specific asymmetric line pattern that encodes position information. This preliminary design allows the optical sensor to quickly and accurately determine the initial position of the control bar by analyzing the pattern's orientation and configuration, without requiring complex additional components or procedures.
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 solution enables accurate determination of the stick body's rotation direction, shifting position, and initial position, enhancing the joystick's operational precision and reliability by analyzing the optical sensor's captured images and intensity variations.
Implementation Method 1
The optical sensor is disposed inside the casing and adapted to acquire an identification image containing the identification mark, and analyze feature variation of the first line group and the second line group within the identification image to determine a gesture of the stick body
Data Source
AI summary
A joystick includes a casing, a stick body, an identification mark and an optical sensor. The casing has a hole. The stick body is movably disposed on the casing. The stick body has a first section and a second section. The first section penetrates through the hole to protrude from the casing, and the second section is inside the casing. The identification mark is disposed on the second section of the stick body. The identification includes a first line group and a second line group crossed to each other. The first line group and the second line group respectively has a plurality of lines with different widths and arranged adjacent to each other. The optical sensor is disposed inside the casing and adapted to acquire an identification image containing the identification mark to determine a gesture of the stick body.