Handheld Radio Chamfer Sensor for One-Handed Navigation
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Solution Overview
Problem
Modern hand-held communication devices, such as land-mobile radios, face challenges in single-handed operation due to the need to maintain a push-to-talk switch in a depressed state while navigating with optical finger navigation, which is ergonomically poor and difficult for users to manage simultaneously.
Innovation Solution
The design incorporates chamfer surfaces with sensors on hand-held communication devices, allowing for directional input and enabling simultaneous operation of the PTT switch and optical finger navigation, with sensors positioned to facilitate thumb access for cursor navigation and switch activation with the same hand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical finger navigation is implemented on the front surface, then cursor navigation capability is improved, but ergonomic operability during single-handed use deteriorates
Solution Approach 1:
The patent moves the optical finger navigation sensor from the traditional front surface (2D plane) to the chamfer surface (3D angled surface), utilizing the chamfer geometry to position the sensor in a location that is simultaneously accessible by the thumb while maintaining proper optical orientation. This dimensional relocation resolves the contradiction by making the sensor accessible during single-handed operation without compromising navigation capability.
Solution Approach 2:
The chamfer surface acts as an intermediary element between the front surface and the side surface, providing a dedicated mounting location for the optical sensor that mediates between the conflicting requirements of navigation functionality and ergonomic accessibility. The chamfer surface serves as a transition zone that allows the sensor to be positioned optimally for both purposes.
2Adaptability or versatility
If PTT switch and optical sensor are both located on the front surface, then device functionality is improved, but simultaneous operation difficulty increases
Solution Approach 1:
The patent segments the device surface into distinct functional zones: the front surface for the display and primary controls, and the chamfer surface for the optical sensor. This spatial segmentation allows the PTT switch and optical sensor to be separated onto different surfaces, enabling simultaneous operation with one hand while maintaining all required functionalities.
Solution Approach 2:
By relocating the optical sensor to the chamfer surface (utilizing the third dimension of device geometry), the patent creates physical separation between the PTT switch and optical sensor controls. This dimensional redistribution allows both controls to be simultaneously accessible during single-handed operation, resolving the simultaneous operation difficulty while preserving full device functionality.
3Ease of manufacture
If optical sensor is positioned for conventional front surface mounting, then manufacturing simplicity is improved, but operational accessibility deteriorates
Solution Approach 1:
The chamfer surface, which traditionally serves a structural or aesthetic function, is repurposed to also serve as the mounting surface for the optical sensor. This multi-functional use of the chamfer surface maintains manufacturing simplicity (as the chamfer is already part of the device housing) while dramatically improving operational accessibility by positioning the sensor in a thumb-accessible location.
Data Source
AI summary
Hand-held communication devices (10) include one or more sensors (78, 92) positioned so as to permit the user to perform optical finger navigation (OFN) and other types of finger navigation on a display (68) of the device (10) while the user holds the device (10) using the same hand.