Variable Speed Input Apparatus for Ruggedized Handheld Devices
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Solution Overview
Problem
Handheld electronic devices face issues with moisture and debris ingress due to the design of track wheel assemblies, and directional buttons fail to replicate the variable speed navigation experience of track wheels.
Innovation Solution
A navigational assembly with a resilient membrane and input members that allow user-controlled variable speed navigation, including a scrolling operation, while being sealed to prevent damage from debris and moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a track wheel assembly is used for navigation, then variable speed scrolling capability is improved, but the device becomes vulnerable to moisture and debris ingress
Solution Approach 1:
The patent employs a flexible membrane as a sealing barrier that covers the input members while allowing them to move. This membrane prevents moisture and debris from entering the device interior through the gaps that would otherwise exist around movable input members, while still permitting the membrane to deflect and transmit user input forces to the underlying components.
2Object-affected harmful factors
If directional buttons are used instead of track wheel, then gaps are reduced preventing debris entry, but variable speed navigation capability is lost
Solution Approach 1:
The patent implements input members that can be actuated with varying degrees of force and speed, enabling dynamic control over navigation speed. The system detects the speed at which the input member is actuated and adjusts the scrolling speed accordingly, providing variable speed navigation similar to track wheel assemblies while maintaining a sealed structure.
Solution Approach 2:
The patent changes the operational parameters of the input members by allowing them to be actuated at different speeds and forces. The system detects these parameter variations and translates them into corresponding variable scrolling speeds, thereby achieving variable speed navigation without requiring a track wheel mechanism.
3Reliability
If a sealed navigational assembly is implemented, then device ruggedization is improved, but input mechanism complexity increases
Solution Approach 1:
The flexible membrane serves multiple functions simultaneously: it acts as a sealing barrier to prevent moisture and debris ingress, serves as a structural support for the input members, and functions as a force transmission medium that transfers user input to the underlying components. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The patent merges the sealing function with the input mechanism by integrating the flexible membrane directly into the input assembly structure. The membrane is positioned and configured to simultaneously provide environmental sealing and facilitate input member actuation, combining what could be separate functions into a unified structure.
Data Source
AI summary
An improved handheld electronic device and method provide an input apparatus having a number of input members, at least a portion of the input members being movable among an unactuated position, a first actuated position, and a second actuated position in order to provide input. The improved method of enabling input into the handheld electronic device includes detecting a first input from a first input member, responsive to the first input, performing a first navigational function, such as a scrolling operation, at a first speed, detecting a second input form the first input member and, responsive to the second input, performing the first navigational function at a second speed, the second speed being different (e.g., greater) than the first speed. The input apparatus may include a substantially sealable, resilient membrane with the input members being disposed on the resilient membrane in order to provide an improved, ruggedized input apparatus.