Roller Input Device With Spacing-Controlled Button Stops
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Solution Overview
Problem
Roller input devices can malfunction due to improper user operation, such as applying excessive force, causing unintended swinging and downward movement, which triggers incorrect button switches.
Innovation Solution
The roller input device incorporates a substrate with a click button switch and tilt button switches, a bracket assembly, and a stopping member connected to the roller seat. The stopping member has stopping portions that adjust to prevent the roller seat from triggering the wrong button switches by maintaining specific spacings that are less than the required pressing strokes, thereby preventing malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the roller seat is allowed to move freely in multiple directions, then the operational versatility is improved, but the reliability deteriorates due to potential malfunctions from improper force application
Solution Approach 1:
The stopping member is pre-positioned to counteract potential harmful movements before they occur. When the roller seat moves downward or swings excessively, the stopping portion of the stopping member makes contact to prevent further movement, thereby preventing malfunction before it can happen.
Solution Approach 2:
The stopping member acts as an intermediary element between the roller seat and the button switches. It mediates the movement of the roller seat by providing a stopping mechanism that prevents the roller seat from triggering the wrong button switches due to excessive force or improper operation.
2Ease of operation
If the spacing between the stopping portion and substrate is large, then the roller seat has more movement freedom, but the precision of button triggering deteriorates
Solution Approach 1:
The spacing parameter between the stopping portion and the substrate is carefully controlled and optimized. By adjusting this spacing to be less than the pressing stroke of the tilt button switch, the design achieves a balance where the roller seat can move freely enough for normal operation while ensuring precise button triggering without excessive movement freedom that would cause malfunction.
Data Source
AI summary
A roller input device includes a substrate, a bracket assembly, a roller seat, and a stopping member. The substrate has a top surface provided with a click button switch and a first tilt button switch. The bracket assembly and the roller seat are disposed on the substrate. The roller seat is pivotally connected to the bracket assembly. The stopping member is connected to the roller seat and has a first stopping portion. A first initial spacing is between the first stopping portion and the top surface. When the roller seat is at a pressing position, the first initial spacing is reduced to a first spacing being less than a first pressing stroke of the first tilt button switch. When the roller seat is at a first tilt position, the first initial spacing is reduced to a second spacing being less than a click pressing stroke of the click button switch.