Multidirectional Center Key Layout for Compact Mobile Keyboards
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Solution Overview
Problem
The challenge in designing keyboards for handheld mobile devices is the trade-off between accommodating larger navigation devices and maintaining efficient key spacing, often resulting in finger overlap issues due to smaller keys and limited space.
Innovation Solution
The integration of a multidirectional navigational input key that serves both alphabetic and navigational functions, allowing for larger keys and a dual-mode operation, along with a touchpad or rotatable rim for additional navigation, which enables efficient key layout optimization and reduces finger overlap.
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 available space for keys is reduced
Solution Approach 1:
The patent combines the navigation device with existing keyboard keys by making the center key multidirectional. This key can be pressed in different directions (up, down, left, right) to navigate through menu options, eliminating the need for a separate navigation device and preserving keyboard surface area.
Solution Approach 2:
The center key is designed to serve multiple functions: it can be pressed vertically for select/confirm actions, pressed horizontally for navigation, and tilted for directional input. This multi-functionality allows a single key to replace what would traditionally require separate navigation controls.
2Quantity of substance
If keys are made smaller to accommodate more keys or a navigation device, then keyboard density is improved, but finger overlap and accidental key presses increase
Solution Approach 1:
The patent applies different key sizes strategically: larger keys are positioned in the center where fingers naturally rest and where navigation actions occur, while smaller keys are placed at the periphery. This local variation in key size ensures that critical navigation and selection keys are large enough to prevent finger overlap, while maintaining high keyboard density overall.
3Volume of moving object
If the keyboard surface area is reduced to fit smaller devices, then device portability is improved, but key size and typing comfort deteriorate
Solution Approach 1:
The patent merges navigation functionality into the keyboard structure itself, specifically by making the center key multidirectional. This eliminates the need for additional navigation hardware that would consume valuable keyboard real estate, allowing the keyboard to maintain adequate key sizes even on compact devices.
Solution Approach 2:
The multidirectional center key serves multiple purposes: navigation in four directions, selection confirmation, and menu activation. This multi-functionality reduces the total number of keys needed, allowing for larger individual key sizes while maintaining all necessary functionality on a compact device.
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.