Integrated Navigation Key Layout for Space-Constrained Mobile Keyboards
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Solution Overview
Problem
Handheld mobile device keyboards face challenges with space constraints due to larger navigation devices, leading to smaller keys that can cause finger overlap and difficulty in pressing adjacent keys without accidental activation.
Innovation Solution
The integration of a multidirectional navigational input key that combines navigation and alphanumeric functions, allowing for larger keys and preventing finger overlap by making middle column keys larger and outer column keys smaller, along with the use of a touchpad or rotatable rim for additional navigation inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate navigation device (trackball or rotating wheel) is added to the keyboard, then navigation control is improved, but the device size increases and key size decreases
Solution Approach 1:
The patent combines the navigation function and alphanumeric input function into a single key structure. The key includes a keycap with a navigation pad integrated into its top surface, allowing users to perform both navigation and text input operations without requiring separate navigation devices. This merging eliminates the need for additional space-consuming navigation components while maintaining both functionalities.
Solution Approach 2:
The key structure is designed to serve multiple functions: it acts as both an alphanumeric input key and a navigation control device. The navigation pad on the keycap surface enables directional control, while the keycap itself provides text input capability. This multi-functionality allows a single key to replace what would traditionally require separate components, optimizing the use of limited keyboard surface area.
2Quantity of substance
If keys are made smaller to accommodate more keys on the keyboard, then keyboard density is improved, but finger overlap occurs when pressing keys
Solution Approach 1:
The key structure is segmented into distinct functional zones: the keycap for alphanumeric input and the navigation pad on top for directional control. This segmentation allows each zone to be optimized independently - the keycap can be made compact for density while the navigation pad provides adequate surface area for accurate finger placement, preventing overlap issues.
Solution Approach 2:
The navigation functionality is added in the vertical dimension by placing a navigation pad on the top surface of the keycap. This dimensional addition allows navigation controls to be integrated without increasing the horizontal footprint of the key, thereby maintaining keyboard density while providing sufficient navigation surface area to prevent finger overlap.
3Ease of operation
If a navigation device is integrated into the key, then navigation control is improved without increasing device size, but the key structure becomes more complex
Solution Approach 1:
The navigation pad is nested within the key structure, specifically positioned on the top surface of the keycap. This nesting approach allows the navigation functionality to be contained within the existing key footprint without requiring additional space or complex external mechanisms. The navigation pad is integrated into the key assembly in a space-efficient manner that minimizes structural complexity.
Data Source
AI summary
A key arrangement that includes a plurality of keys arranged in a pattern including a first column, a last column, and one or more middle columns. At least one of the middle columns includes a multidirectional navigational key. The first and last columns have keys in each row. A plurality of the keys and the multidirectional navigational input key have alphanumeric indicia. The multidirectional navigational input key may be integrated with the keys in a reduced QWERTY, QWERTY, QWERTZ, AZERTY, or DVORAK layout and may additionally be integrated with the keys in a telephony pad numeric layout. A touchpad or rotatable rim may also be disposed about the multidirectional navigational input key.