Keypad Assembly Dome Overlay Sealing for Edge Domes
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Solution Overview
Problem
Mobile devices with QWERTY keypads face spatial constraints, leading to domes being positioned near the edge of the circuit board, making them susceptible to contamination and potentially misaligned, which degrades tactile feedback performance.
Innovation Solution
A keypad assembly with a dome overlay and interlocking component that creates a sealed environment, allowing domes to be placed near the edge while protecting them from contaminants and maintaining alignment with keys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If domes are positioned near the edge of the circuit board to accommodate QWERTY keypad in limited space, then the device can fit more keys, but the domes become susceptible to contamination from external contaminants
Solution Approach 1:
A dome overlay structure is introduced that extends beyond the edge of the circuit board to provide a sealed environment for the domes. This overlay acts as a protective barrier that prevents external contaminants from reaching the domes positioned near the board edge, while still allowing the keys to maintain their QWERTY layout configuration.
2Object-affected harmful factors
If domes are moved towards the center of the circuit board to avoid contamination, then contamination susceptibility is reduced, but the domes become misaligned with the keys on the edges of the keypad
Solution Approach 1:
The dome overlay is designed to extend beyond the circuit board edge, creating a sealed environment that protects the domes while allowing them to remain in their optimal positions for key alignment. This resolves the conflict between contamination protection and alignment precision by providing external protection rather than requiring internal repositioning.
3Area of stationary object
If domes are positioned near the edge of the circuit board, then spatial constraints are accommodated, but tactile feedback performance may be degraded due to misalignment
Solution Approach 1:
The dome overlay creates a sealed environment that maintains the structural integrity and alignment of the domes with their corresponding keys. This ensures that the tactile feedback performance remains reliable even when domes are positioned near the edge of the circuit board to maximize space utilization.
Data Source
AI summary
A keypad assembly is described herein in which the keypad assembly includes a substrate and a plurality of domes positioned on the substrate and configured to translate operator action into a corresponding input for a machine. The keypad assembly also includes a dome overlay positioned over the domes and the substrate in which the dome overlay can create a sealed environment for the substrate and the domes. A light guide that directs light in the keypad assembly and an interlocking component coupled to the light guide can also be part of the keypad assembly. In one arrangement, the interlocking component can selectively compress the dome overlay to assist in the creation of the sealed environment. In another arrangement, the interlocking component can compress the dome overlay by bending the dome overlay at an edge of the substrate.