Infrared Sensor Asymmetric Protrusion Wall for Thermal Stability
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Solution Overview
Problem
Infrared temperature sensors experience variations in output due to shape and dimension variations in the sensor case and assembly errors, leading to inaccurate temperature measurements and susceptibility to environmental disturbances.
Innovation Solution
The sensor features a sensor case with a light guiding region and a light shielded region, a heat conversion film, and a sensor cover, where the light guiding region guides infrared rays and the light shielded region is shielded from infrared rays, with a protrusion wall that adjusts to correct the output and reduce the influence of wind and thermal disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the sensor case shape and dimension variations are minimized, then manufacturing precision is improved, but device complexity increases due to the need for precise assembly structures
Solution Approach 1:
The patent introduces an asymmetric protrusion wall structure that extends into the detection chamber, creating an asymmetric layout for the infrared detection element and temperature compensation element. This asymmetric design allows the sensor to compensate for manufacturing variations and assembly errors by strategically positioning elements to balance thermal influences, thereby reducing the need for extremely precise sensor case dimensions while maintaining measurement accuracy.
2Stability of the object's composition
If the infrared detection element and temperature compensation element are positioned symmetrically, then thermal influence balance is improved, but assembly precision requirements increase
Solution Approach 1:
Rather than using symmetric positioning that would require high assembly precision, the patent employs asymmetric positioning of the infrared detection element and temperature compensation element within the detection chamber. The protrusion wall creates distinct zones that guide the elements to specific asymmetric positions, balancing thermal influences through strategic placement rather than symmetry, thereby reducing assembly precision requirements.
Solution Approach 2:
The patent applies local quality by creating a specific thermal environment for each element through the protrusion wall structure. The infrared detection element is positioned to receive infrared radiation while the temperature compensation element is positioned in a region with different thermal characteristics. This localized thermal environment design balances the overall thermal influences on the sensor output without requiring symmetric element positioning.
3Manufacturing precision
If the protrusion wall is added to guide element placement, then assembly accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the detection chamber into distinct regions using the protrusion wall, creating separate zones for the infrared detection element and temperature compensation element. This segmentation provides natural positioning guides that simplify assembly by defining specific locations for each element, improving placement accuracy without requiring complex external fixtures or alignment mechanisms.
Solution Approach 2:
The protrusion wall adds a three-dimensional structural element within the detection chamber, creating vertical and horizontal spatial differentiation. This dimensional addition provides physical guides for element placement that are more effective than two-dimensional surface features alone, improving assembly accuracy while adding relatively simple structural complexity.
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
This configuration stabilizes temperature detection accuracy by equalizing thermal influences on the infrared detection and temperature compensation elements, allowing for robust and accurate measurement of the detection object's temperature despite environmental changes.
Implementation Method 1
a film that is disposed to face the light guiding region and the light shielded region and is configured to absorb the infrared rays reaching through the light guiding region and to convert the infrared rays into heat
Implementation Method 2
detects, by the infrared detection element, a radiation heat quantity of infrared rays of a roller that is the fixing means as a detection object
Implementation Method 3
further detects atmospheric temperature by the temperature compensation element to compensate the temperature
Data Source
AI summary
An infrared temperature sensor that detects temperature of a detection object in a non-contact manner includes a sensor case that includes a light guiding region and a light shielded region, a film that absorbs and converts infrared rays into heat, a sensor cover, an infrared detection element, and a temperature compensation element. The sensor case includes a case base portion and a hood that surrounds the light guiding region and the light shielded region and is erected from the case base portion. The hood includes an opening part and a shielding part that protrudes toward an inside of the hood while defining the opening part and the light guiding region, and shields the light shielded region from the infrared rays. A protrusion direction of the shielding part toward the inside of the hood is adjustable.