Flat Input Device Main Sub Switch Position Control
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Solution Overview
Problem
In flat-type input devices, simultaneously pressing multiple switching mechanisms leads to ambiguity in determining which output signal has priority, resulting in potential incorrect operations due to the independent arrangement of switching mechanisms on the same surface.
Innovation Solution
The input device incorporates a main switch unit and sub-switch units, with a control unit determining the position based on capacitance changes when both are activated, treating signals from sub-switch units as valid only when pressed in specific areas and signals from the main switch unit as valid elsewhere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple switching mechanisms are arranged on the same surface and operated independently, then the device can detect multiple inputs simultaneously, but it becomes difficult to determine which output signal has higher priority when multiple switches are pressed at the same time
Solution Approach 1:
The patent introduces a control unit as an intermediary that receives signals from both the flat-type input unit and switching mechanisms. This control unit mediates between the two input sources by determining which signal to prioritize based on predefined rules, thereby resolving the ambiguity of simultaneous inputs without losing signal priority information
Solution Approach 2:
The patent changes the parameter of signal validation by introducing position-based conditional processing. The control unit validates signals from switching mechanisms only when the flat-type input unit detects a position outside a specific area, and vice versa. This parameter change (validity condition based on position) resolves the contradiction by providing clear priority rules
2Ease of operation
If switching mechanisms are arranged independently on the same surface, then each switch can be operated separately, but wrong switching mechanisms may be pressed leading to unexpected operations
Solution Approach 1:
The patent changes the validity parameter of switching mechanism signals based on the position detected by the flat-type input unit. When the detected position is outside the specific area, signals from switching mechanisms are validated; when inside, they are invalidated. This dynamic parameter change ensures that only the intended switching mechanism is activated, preventing wrong operations while maintaining independent operation capability
Solution Approach 2:
The control unit implements feedback by continuously monitoring the position detected by the flat-type input unit and using this information to validate or invalidate signals from switching mechanisms. This feedback loop ensures that the system responds appropriately to the user's intent, improving operation accuracy while preserving ease of operation
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
This solution ensures accurate determination of the pressed area, preventing incorrect operations by distinguishing between main and sub-switch unit signals, thus enhancing operational precision.
Implementation Method 1
capable of detecting a position specified by a control object on the basis of a change in capacitance that occurs when the control object touches the flat-type input unit
Data Source
AI summary
A flat-type input unit capable of outputting information regarding a position where a finger touches as coordinate data is provided in a casing of an input device. A main-switch unit and sub-switch units operated by the flat-type input unit are also provided in the casing. When ON output signals are simultaneously supplied from the main-switch unit and one of the sub-switch units, the flat-type input unit determines a position where the finger touches by performing a detection operation. It can be determined on the basis of the position whether the main-switch unit or the sub-switch unit is controlled. Moreover, since pressing any position of the flat-type input unit can cause the main-switch unit to supply an ON output signal, a confirmation input can be performed easily with the ON output signal supplied from the main-switch unit.