Infrared Sensor Holder Segmentation Prevents Adhesive Contamination
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Solution Overview
Problem
Infrared sensor configurations where optical filters are adhered using adhesives risk contamination due to adhesive spread, leading to compromised filter performance and transmittance.
Innovation Solution
A holder design with recessed optical filter accommodation parts and a separate adhesion region for the adhesive, featuring a groove to contain any adhesive leakage, prevents adhesive contact with optical filters and ensures proper adhesion between the holder and infrared sensor element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to adhere the holder and infrared sensor element together, then the adhesion strength is improved, but the adhesive may spread out and contaminate the optical filters
Solution Approach 1:
The holder surface is segmented into distinct functional zones: an adhesion region for adhesive application and optical filter accommodation regions that are spatially separated. This segmentation prevents adhesive spread from reaching the optical filters while maintaining effective adhesion in the designated area.
Solution Approach 2:
Different regions of the holder are given different functional properties: the adhesion region has properties suitable for adhesive bonding, while the optical filter accommodation regions are designed to be adhesive-free zones. This local differentiation ensures that adhesive is confined to appropriate areas and does not contaminate optical components.
2Ease of manufacture
If the adhesive application portions and optical filter surfaces are on the same surface, then the manufacturing process is simplified, but the risk of adhesive contamination increases
Solution Approach 1:
The holder surface is divided into spatially separated adhesion and optical filter accommodation regions. This segmentation maintains manufacturing simplicity by using a single holder structure while eliminating the contamination risk through proper spatial arrangement of functional zones.
Solution Approach 2:
The holder structure itself acts as an intermediary element that mediates between the adhesive application needs and the optical filter protection requirements. By designing the holder with integrated adhesion and filter accommodation regions in appropriate spatial relationships, it prevents direct contact between adhesive and optical filters.
3Reliability
If a large amount of adhesive is applied, then the adhesion reliability is improved, but the adhesive may spread out and contaminate the optical filters
Solution Approach 1:
The holder is designed with a dedicated adhesion region that is spatially separated from optical filter accommodation regions. This segmentation allows application of sufficient adhesive quantity for reliable bonding while the spatial separation prevents adhesive spread from reaching the optical filters.
Solution Approach 2:
The holder structure is pre-designed with defined adhesion and optical filter accommodation regions before adhesive application. This preliminary structural arrangement ensures that even when adhesive is applied in sufficient quantities for reliable bonding, it remains confined to the adhesion region and cannot contaminate the optical filters.
Data Source
Figure 1~2B
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Figure 5
AI summary
There is provided an infrared sensor and a holder which is capable of preventing optical filters from being contaminated by adhesives used to fix filters to the detection element (infrared sensor element). A holder 20 included in an infrared sensor includes accommodation parts 21a and 21b that accommodate optical filters, recess parts 23a and 23b that are provided on the opposite surface 20a of the holder 20 which faces the to the infrared sensor element and are placed apart from the accommodation parts 21a and 21b, a groove 25a that is provided on the opposite surface 20a and is placed between the accommodation part 21a and the recess part 23a, and a groove 25b that is provided on the opposite 20a and is placed between the accommodation part 21b and the recess part 23b. The depth d2 of each of the grooves 25a and 25b is greater than the depth d1 of each of the recess parts 23a and 23b. In a process of adhering the infrared sensor element to the holder 20, an adhesive is applied to the recess parts 23a and 23b.