Portable Computer Elastomer Overmolding and Passive Cooling
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Solution Overview
Problem
Portable computers face challenges in balancing compactness with robustness and heat dissipation while maintaining resistance to contamination in harsh environments like healthcare and manufacturing, where they are susceptible to dust, dirt, and germs, and difficult to clean.
Innovation Solution
A portable computer design incorporating multiple radios, image capture devices, a magnesium alloy frame, elastomer overmolding for impact resistance and ease of cleaning, and integrated data capture technologies like RFID and barcode scanners, along with a semi-sealed structure and passive cooling to manage heat and prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If portable computer is made compact and lightweight by reducing material for strengthening and cushioning, then portability is improved, but robustness and impact resistance deteriorate
Solution Approach 1:
The patent employs a magnesium alloy frame combined with elastomer overmolding to create a composite structure. The magnesium alloy provides structural strength and rigidity while the elastomer layer adds impact resistance and cushioning. This composite approach allows the device to maintain robustness without excessive weight, as the lightweight magnesium alloy replaces heavier traditional metals while the elastomer coating adds protective functionality.
2Power
If processing power is increased to improve computational capability, then processing capability is improved, but heat generation increases causing discomfort or burning to user
Solution Approach 1:
The elastomer overmolding serves as a thermal management solution by providing thermal insulation between the hot internal components and the user's hand. This flexible shell layer prevents excessive heat transfer to the user, allowing higher processing power to be utilized without causing discomfort or burning sensations during handheld operation.
3Temperature
If active cooling system with fan is added to improve heat dissipation, then cooling efficiency is improved, but device becomes susceptible to contamination by dust, dirt, and germs
Solution Approach 1:
The patent removes the active cooling fan system entirely, extracting this component that creates contamination vulnerabilities. Instead, the design relies on passive thermal management through the elastomer overmolding and optimized thermal pathways, eliminating the need for airflow openings that would allow dust, dirt, and germs to enter sensitive internal areas.
4Temperature
If airflow openings are added for active cooling, then heat dissipation is improved, but susceptibility to contamination by dust, dirt, and germs increases
Solution Approach 1:
The patent eliminates airflow openings by removing the active cooling system. The design achieves thermal management without requiring any openings in the housing, thereby maintaining a sealed structure that prevents contamination while still dissipating heat through passive means.
5Strength
If device is made difficult to access and clean in sensitive areas, then robustness is improved, but ease of cleaning deteriorates
Solution Approach 1:
The patent divides the device into separable components, with the elastomer overmolding serving as a removable or replaceable protective layer. This segmentation allows the outer coating to be easily wiped clean or replaced without disassembling the internal robust structure, maintaining both protection and cleanability.
Data Source
AI summary
A portable computer having multiple modes of connectivity is disclosed. The portable computer may be configured to communicate using several wireless transmission protocols, including WWAN, WiFi, and Bluetooth. The portable computer may also receive input from multiple devices, including a bar code scanner, camera, RFID reader, fingerprint reader, digitizer, and an audio subsystem. The portable computer may also contain an accelerometer, and may be configurable to automatically park its hard drive disk when acceleration of a predetermined magnitude is detected.