Reusable Liquid Crystal Thermometer with Layered Substrate
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Solution Overview
Problem
Existing thermometers are typically single-use and require a dwell time of 60 seconds, which can be inconvenient and wasteful, especially in scenarios where rapid and repeated temperature measurements are needed.
Innovation Solution
A reusable thermometer design featuring a substrate with liquid crystal temperature sensing compositions in voids between the substrate and an optically transparent cover layer, supported by biaxially-oriented polyester and polypropylene films, and adhesive layers for durability and quick measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single-use thermometers are used, then manufacturing simplicity is maintained, but reusability and productivity are poor
Solution Approach 1:
The thermometer is divided into multiple functional layers including substrate, liquid crystal composition layer, optically transparent cover layer, and support layers. Each layer performs a specific function, allowing the complex structure to be managed through modular segmentation while achieving reusability.
Solution Approach 2:
The thermometer employs composite material structure combining substrate, liquid crystal compositions, optically transparent cover layers, and support layers. This composite approach enables the device to achieve both reusability and structural integrity, resolving the contradiction between complexity and productivity.
2Loss of time
If conventional thermometers are used, then structural simplicity is maintained, but dwell time is excessive (60 seconds)
Solution Approach 1:
The patent changes the physical and chemical parameters of the thermometer structure, including using specific liquid crystal compositions and optimizing layer configurations, to reduce dwell time from 60 seconds to faster measurement times while maintaining structural coherence.
Solution Approach 2:
The patent replaces conventional mechanical temperature sensing mechanisms with liquid crystal temperature sensing compositions that provide faster response times. This substitution reduces dwell time while the added layers manage the increased complexity.
3Reliability
If reusable thermometer structure is implemented, then reusability is improved, but manufacturing complexity increases
Solution Approach 1:
The reusable thermometer is segmented into discrete layers (substrate, liquid crystal composition, cover layer, support layers) that can be manufactured and assembled separately. This segmentation improves reusability while managing manufacturing complexity through modular construction.
Solution Approach 2:
The support layers and adhesive layers serve multiple functions: structural support, layer bonding, and durability enhancement. This multi-functionality improves reusability and reliability while reducing the need for additional separate components, thereby easing manufacturing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The thermometer achieves a reduced dwell time of less than 60 seconds, enabling rapid and repeated temperature measurements while maintaining durability and reusability, thus addressing the limitations of single-use thermometers.
Implementation Method 1
a plurality of voids between the substrate and the optically transparent cover layer, each void of the plurality of voids containing a liquid crystal temperature sensing composition
Data Source
AI summary
A thermometer includes a substrate, a cover layer, and a plurality of voids between the substrate and the cover layer. Each void contains at least one liquid crystal temperature sensing composition. The plurality of voids is arranged in at least one array (e.g., two rectangular arrays). The cover layer is located between the substrate and a biaxially-oriented polyester film. The thermometer may include at least two support layers on a side of the substrate opposite the cover layer and a biaxially-oriented polypropylene film/tape above a portion of the biaxially-oriented polyester film.