Integrated Thermal Imaging Module With Shutter Calibration
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Solution Overview
Problem
Thermal imaging devices have a large number of components, leading to significant cumulative tolerance during assembly, which adversely affects imaging accuracy and increases production costs.
Innovation Solution
A thermal imaging module design with a reduced number of components, featuring a lens assembly with a mounting part and extension part, a substrate enclosing an accommodating cavity for an infrared detector, and a correction shutter assembly with a blocking plate and movement mechanism to ensure high imaging accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional lens assembly structure with separate lens holder and housing is used, then the lens can be mounted and protected, but the number of components increases resulting in large cumulative tolerance and reduced imaging accuracy
Solution Approach 1:
The patent merges the lens holder and housing into a single integrated lens barrel structure. The lens barrel simultaneously provides mounting functionality for the lens and protective housing functions, eliminating the need for separate components. This integration reduces the total number of components and assembly steps, thereby minimizing cumulative tolerance accumulation and improving imaging accuracy.
Solution Approach 2:
The lens barrel is designed to perform multiple functions: it serves as both the mounting structure for the lens and the protective housing for the entire optical assembly. This multi-functional design reduces component count while maintaining all necessary functions, directly addressing the contradiction between device complexity and manufacturing precision.
2Manufacturing precision
If multiple separate components are used in the thermal imaging device, then each component can be optimized independently, but the cumulative tolerance during assembly significantly adversely impacts imaging accuracy
Solution Approach 1:
By combining the lens holder and housing into a single lens barrel component, the patent reduces the number of assembly steps and interfaces where tolerance accumulation occurs. Fewer assembly operations mean less cumulative tolerance, directly improving imaging accuracy while simplifying the manufacturing process.
3Measurement precision
If the lens barrel is extended to accommodate the infrared detector, then the detector can be positioned correctly, but the overall device size increases
Solution Approach 1:
The patent nests the infrared detector inside the extended portion of the lens barrel, utilizing the existing structural space. The detector is positioned within the cavity formed by the lens barrel's extension, eliminating the need for separate housing structures. This nesting approach achieves precise detector positioning while minimizing overall device volume.
Solution Approach 2:
The lens barrel extends along the optical axis (one dimension) to accommodate the detector, rather than expanding in other dimensions. This dimensional extension allows the detector to be positioned at the correct location without increasing the lateral footprint of the device, thus maintaining compact overall size while achieving precise positioning.
Data Source
AI summary
A thermal imaging module and an electronic device. The thermal imaging module comprises a lens assembly, the lens assembly comprising a lens barrel and a lens, the lens barrel comprising a mounting part and an extension part connected to one side of the mounting part, the mounting part being provided with a light through hole, the lens being mounted on the mounting part, and the lens being arranged to cover the light through hole in the axial direction of the light through hole; a substrate, connected to the side of the extension part away from the mounting part, the substrate and the extension part defining an accommodating cavity; an infrared detector, located in the accommodating cavity and fixed to the side of the substrate facing the lens; and a correction shutter assembly, the correction shutter assembly being located on the light incident side of the infrared detector and being installed on the lens barrel, the correction shutter assembly comprising a correction blocking piece and a correction blocking piece movement mechanism, the correction blocking piece being arranged on the correction blocking piece movement mechanism, and the correction blocking piece movement mechanism being configured to drive the correction blocking piece to avoid or block the light through hole. The thermal imaging module disclosed in the embodiments of the application has fewer parts, so that the cumulative tolerance is less and the precision is higher.