Optical Joystick Structure for Thin, Accurate Gesture Sensing
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Solution Overview
Problem
Conventional mechanical joysticks suffer from limited gesture operation, mechanical fatigue, and reduced accuracy due to design limitations and potential damage from long-term use, especially in thin joystick designs.
Innovation Solution
A joystick design featuring a casing with a movable stick body, an optical sensor, and an identification pattern within a sunken structure, allowing for precise motion detection and minimizing structural dimensions while maintaining optical path length, using a resilient component for recovery and a light source for enhanced accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the joystick is designed as a thin joystick to minimize structural dimensions, then the device size is reduced, but the movable structural component is easily damaged after long-term operation and accuracy is decreased
Solution Approach 1:
The patent replaces the conventional mechanical sensor detection system with an optical detection system. An optical sensor detects the movement of an identification pattern (such as a reflective marker or coded pattern) on the indication portion, eliminating the need for complex mechanical sensors and trackballs that are prone to damage in thin joystick designs. This substitution maintains accuracy while improving reliability.
Solution Approach 2:
The patent introduces an optical field dimension by using light reflection and optical patterns for detection. Instead of relying solely on mechanical dimensions and physical contact, the system uses optical paths and light interaction with the identification pattern to detect movement, adding a new dimensional approach to the detection mechanism.
2Volume of moving object
If the optical sensor is placed closer to the identification pattern to minimize structural dimensions, then the device size is reduced, but the optical path length is insufficient for accurate detection
Solution Approach 1:
The patent uses optical reflection principles to extend the effective optical path length without increasing physical distance. The identification pattern acts as a reflective element that redirects light back through the optical sensor, effectively doubling the optical path length within a compact structure. This allows sufficient optical interaction for accurate detection while maintaining minimal structural dimensions.
3Device complexity
If conventional mechanical sensors are used to detect trackball movement, then the structure is simple, but the joystick is operated by limited gestures and results in mechanical fatigue
Solution Approach 1:
The patent replaces mechanical sensors with an optical sensor system that detects the movement of an identification pattern. This substitution enables more versatile detection capabilities, allowing the joystick to recognize a wider variety of gestures including rotation, tilting, and pressing motions without the limitations of mechanical sensor design. The optical system can detect subtle movements and complex gesture patterns that would be difficult to implement mechanically.
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 design provides improved identification accuracy and efficiency by minimizing structural dimensions, preventing mechanical fatigue, and maintaining optical path length, thus reducing cursor drift and enhancing operational reliability.
Implementation Method 1
The optical sensor is disposed inside the casing and faces the sunken structure, and adapted to analyze a movement of the identification pattern
Implementation Method 2
adapted to recover the pressing portion to an initial position via a resilient recovering force of the resilient component
Data Source
AI summary
A joystick includes a casing, a stick body and an optical sensor. The casing has a hole. The stick body is movably disposed on the casing via the hole. The stick body includes a pressing portion, an indication portion and an identification pattern. The indication portion is connected to the pressing portion and inserts into the hole. A sunken structure is formed on a bottom of the indication portion. The identification pattern is disposed on an inner surface of the sunken structure. The optical sensor is disposed inside the casing and faces the sunken structure, and adapted to analyze a movement of the identification pattern to identify a control status of the stick body.