Light Guide Bonding With High-Index Adhesive for Optical Sensing
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Solution Overview
Problem
Conventional sensing apparatuses face issues with yield rate and reliability due to peeling of light guide devices during manufacturing or integration, leading to suboptimal optical path adjustments.
Innovation Solution
Incorporating a light-transmitting adhesive layer with a higher refractive index than the light guide device, positioned between the light guide device and the light-shielding layer, which also includes pinholes to improve bonding and reduce layer thickness, thereby enhancing the yield rate and optical signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light guide device is used to adjust the optical path, then the optical signal quality is improved, but the light guide device may peel during manufacturing or integration, reducing yield rate and reliability
Solution Approach 1:
The patent introduces a light-transmitting adhesive layer as an intermediary between the light guide device and the underlying structure. This adhesive layer with higher refractive index than the light guide device provides both mechanical bonding to prevent peeling and optical functionality to maintain signal quality, thus resolving the contradiction between bonding reliability and yield rate
Solution Approach 2:
The patent changes the refractive index parameter of the adhesive layer to be higher than that of the light guide device. This parameter change optimizes both the bonding strength and the optical collimation effect, preventing peeling while maintaining optical signal quality, thereby improving both reliability and productivity
2Length of stationary object
If the sensing apparatus structure is simplified, then the thickness is reduced, but the bonding strength may be insufficient leading to peeling
Solution Approach 1:
The patent utilizes refractive index as a key parameter, selecting an adhesive layer with higher refractive index than the light guide device. This parameter optimization enables the adhesive layer to provide sufficient bonding strength in a thin configuration, achieving both reduced thickness and improved bonding strength simultaneously
Solution Approach 2:
The patent employs a composite structure consisting of the light guide device and the light-transmitting adhesive layer with different refractive indices. This composite material approach allows the thin adhesive layer to provide both mechanical bonding and optical functionality, resolving the contradiction between reduced thickness and sufficient bonding strength
3Reliability
If a light-transmitting adhesive layer with higher refractive index is used, then the optical signal quality is improved through better collimation, but the manufacturing complexity increases
Solution Approach 1:
The light-transmitting adhesive layer serves multiple functions simultaneously: it provides mechanical bonding between layers, acts as an optical collimation medium due to its higher refractive index, and maintains structural integrity. This multi-functionality improves optical signal quality while avoiding the need for additional separate components, thus not increasing manufacturing complexity
Solution Approach 2:
The patent merges the bonding function and optical collimation function into a single light-transmitting adhesive layer. By combining these two functions that would traditionally require separate components, the patent improves optical signal quality through better collimation while actually simplifying the overall layer structure and reducing manufacturing 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
The solution results in a sensing apparatus with improved yield rate, reduced thickness, and enhanced optical signal quality by ensuring better bonding and optical collimation, reducing the risk of peeling and improving manufacturing efficiency.
Implementation Method 1
The refractive index of the light-transmitting adhesive layer is greater than the refractive index of the light guide device
Data Source
AI summary
A sensing apparatus including a sensing device, a light-transmitting protective layer, a light-shielding layer, a light-transmitting adhesive layer and a light guide device is provided. The light-transmitting protective layer is disposed on the sensing device. The light-shielding layer is disposed on the light-transmitting protective layer. The light shielding layer has a pinhole corresponding to the sensing device. The light-transmitting adhesive layer is disposed on the light-transmitting protective layer and at least in the pinhole. The light guide device is disposed on the light-transmitting adhesive layer and corresponds to the pinhole. There is a gap between the light guide device and the light shielding layer; and/or the refractive index of the light-transmitting adhesive layer is greater than the refractive index of the light guide device.