Dual-Axis Multi-Switch Key for Precise Microswitch Activation
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Solution Overview
Problem
Existing multi-switch designs with a single key that activates multiple microswitches often result in uncertainty regarding which area of the key will activate specific functions, leading to inconsistent responses to user pressure.
Innovation Solution
A multi-switch design featuring a key articulated at two axes with unidirectional connections, allowing precise control of at least three microswitches through defined rotation angles and zones, establishing a clear correspondence between key areas pressed and functions activated, including a central microswitch and optional second end microswitch, with mechanical stops and flexible tabs to prevent overpressure and ensure reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single key is used to activate multiple microswitches, then device complexity is reduced, but uncertainty arises regarding which key area activates specific functions
Solution Approach 1:
The key is segmented into multiple distinct pressing zones (first zone, second zone, central zone) that correspond to different microswitches. Each zone is spatially separated and associated with specific rotational or pressing actions to activate particular microswitches, eliminating ambiguity about which function will be activated.
Solution Approach 2:
Different zones of the key have different functional qualities - the first zone activates the first microswitch through rotation about the first axis, the second zone activates the second microswitch through rotation about the second axis, and the central zone activates the central microswitch through vertical pressing. This local differentiation ensures precise control.
2Ease of operation
If minimum pressure strokes are used to activate microswitches, then ergonomics are improved, but control precision may be compromised
Solution Approach 1:
The key incorporates rotational degrees of freedom about two parallel axes, allowing dynamic control through different motion types (rotation about first axis, rotation about second axis, or vertical pressing). This dynamic mechanism enables precise activation control while maintaining low pressure requirements, as the rotation amplifies the effect of small pressing forces.
Data Source
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AI summary
Multi-switch (D), comprising a base (B) and a key (T) articulated at two ends with respect to the base (B) such that the key (T) can be in a resting position, rotate about a first axis (Γ1) or about a second axis (Γ2) or be displaced in a z direction (Z) and that comprises a first end micro switch (MS1) and a central micro switch (MSC) wherein the activation angle (α1-act) of the first end micro-switch (MS1) is greater than the first activation angle (α1C-act) of the central micro-switch (MSC), such that at least three intervals are defined depending on the rotation angle of the key (T) about the first axis (Γ1), an interval wherein none of the first end (MS1) and central (MSC) micro-switches are activated, an interval wherein only the central micro-switch (MSC) is activated and an interval wherein both the first end (MS1) and central (MSC) micro-switches are activated.