Stick Input Control for Stable Load Detection During Pressing
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Solution Overview
Problem
Existing stick-type coordinate input devices experience instability in load detection due to the combination of pressing and tilting operations, leading to unintended fluctuations in load detection values.
Innovation Solution
The input device incorporates a strain generation body with separate load and switch detection mechanisms, utilizing strain sensors to detect horizontal loads and a switch section for pressing operations, with a controller that stabilizes output values by preventing updates during pressing, employing moving average calculations to maintain consistent load detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a stick-type coordinate input device simultaneously performs tilting operation and pressing operation, then the device can detect both horizontal loads and pressing operations, but the load detection becomes unstable when pressing operation is performed
Solution Approach 1:
The patent segments the detection system into two independent parts: a load sensor for detecting horizontal loads and a switch section for detecting pressing operations. This segmentation allows each sensor to independently detect its specific operation type without interference, resolving the instability issue when both operations are combined.
Solution Approach 2:
The patent implements dynamic control of output values based on the detected operation type. When a pressing operation is detected, the controller maintains the previous output value instead of updating it with new detection values. This dynamic adjustment prevents unintended fluctuations and ensures stable output during pressing operations while maintaining accurate load detection during tilting operations.
2Measurement precision
If strain sensors are used to detect horizontal loads, then the detection precision is improved, but the detection values become unstable during pressing operations
Solution Approach 1:
The patent separates the detection functions into distinct components: strain sensors dedicated to horizontal load detection and a switch section dedicated to pressing operation detection. This segmentation ensures that the strain sensors only measure horizontal loads without being affected by vertical pressing forces, maintaining measurement precision while eliminating instability during pressing operations.
Solution Approach 2:
The switch section acts as an intermediary that provides information about the operation type to the controller. Based on this intermediary information, the controller intelligently decides whether to update output values, thereby preventing instability in strain sensor readings during pressing operations while maintaining their high precision for horizontal load detection.
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 ensures stable and consistent detection of horizontal loads by preventing unintended fluctuations during pressing operations, providing reliable input control.
Implementation Method 1
a load sensor configured to detect a load in a horizontal direction applied to the operation shaft
Data Source
AI summary
An input device includes a strain generation body having an operation shaft, a load sensor configured to detect a load in a horizontal direction applied to the operation shaft, an operation member disposed in an upper portion of the operation shaft, the operation member being configured to be operated in a pressing operation, a switch section configured to detect the pressing operation performed by using the operation member, and a controller configured to output a detection value of the load in the horizontal direction detected by the load sensor and a detection value of the pressing operation detected by the switch section to an external device. The controller is configured not to update the output value of the detection value of the load in the horizontal direction while the pressing operation is being detected by the switch section.