Encapsulated Optical Sensor Stack for Humidity-Resistant Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical sensors face challenges in maintaining high performance and stability over a long time, particularly in safety and security applications, where they are prone to degradation from external factors like humidity and oxygen.
Innovation Solution
An optical sensor design comprising a stack with a substrate, a layer of photoconductive material, and a cover that encapsulates the material, along with spatially separated electrical contacts, exhibits specific mechanical and dielectric properties to enhance durability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical sensor is exposed to external environment, then the sensor can operate and detect objects, but the sensor degrades from humidity and oxygen over time
Solution Approach 1:
The patent applies an amorphous encapsulation layer comprising at least one metal-containing compound that creates an inert barrier environment around the photoconductive material. This encapsulation layer prevents harmful substances like humidity and oxygen from reaching and degrading the photoconductive material, thereby maintaining sensor reliability over thousands of hours of operation.
Solution Approach 2:
The patent uses composite material structure combining the photoconductive material with an amorphous encapsulation layer of metal-containing compounds. This composite structure provides both the functional photoconductive properties and the protective barrier properties, resolving the contradiction between environmental exposure and degradation prevention.
2Reliability
If the optical sensor is encapsulated to protect from degradation, then long-term stability is achieved, but manufacturing complexity increases
Solution Approach 1:
The amorphous encapsulation layer is deposited directly onto the photoconductive material to form a simple yet effective barrier structure. This approach provides comprehensive protection without requiring complex multi-layer encapsulation or hermetic sealing structures, thus maintaining manufacturing simplicity while achieving long-term stability.
Solution Approach 2:
The patent employs a thin film encapsulation approach using amorphous metal-containing compounds that conformally coat the photoconductive material. This thin film provides effective protection against humidity and oxygen penetration while adding minimal structural complexity and maintaining ease of 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 design achieves long-term stability and high performance by minimizing degradation from external influences, ensuring consistent sensor operation over thousands of hours.
Implementation Method 1
a layer of at least one photoconductive material which is applied to the substrate... the optical sensor is designed to generate at least one sensor signal in a manner dependent on an illumination of the sensor region
Data Source
AI summary
Described herein is an optical sensor, a detector for an optical detection including the optical sensor, a method for manufacturing the optical sensor and various uses of the optical detector. The optical sensor includes a stack.