Curved Optical Sensor With Thick Adhesive Layer
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Solution Overview
Problem
Existing curved optical detectors have limited deformation capabilities due to thin glue layers, which restrict their ability to compensate for optical aberrations in imaging systems without degrading the sensor.
Innovation Solution
A curved optical detector with a photosensitive sensor and a support, where a glue layer of thickness greater than or equal to 50 µm is used between the sensor and the support, allowing increased deformation without damaging the sensor, and a Young's modulus between 20 and 80 MPa for the glue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a thin adhesive layer (1-2 μm) is used between the photosensitive sensor and the support, then the sensor closely follows the shape of the support, but the maximum deformation that can be imposed on the sensor is limited without damaging it
Solution Approach 1:
The patent changes the thickness parameter of the adhesive layer from the conventional thin range (1-2 μm) to a thicker range (≥50 μm, preferably 50-150 μm). This parameter change fundamentally alters the mechanical coupling between the sensor and support, allowing the sensor to withstand larger deformations while still achieving adequate shape conformity for optical aberration compensation.
2Adaptability or versatility
If the adhesive layer thickness is increased to allow greater deformation, then the sensor can be deformed more without damage, but the positioning accuracy between sensor and support deteriorates
Solution Approach 1:
The patent identifies an optimal range for the adhesive layer thickness (50-150 μm) that balances deformation capability and positioning accuracy. Within this range, the layer is thick enough to reduce stress on the sensor during deformation, yet thin enough to maintain acceptable positioning accuracy within the depth of field tolerance of the optical system.
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 reduces constraints on the sensor, enabling significant deformation and compensation for optical aberrations, such as field curvature, while maintaining the sensor's integrity and allowing for moderate inaccuracies in positioning that are tolerable within the depth of field.
Implementation Method 1
a large thickness of glue between the photosensitive sensor and the support surprisingly reduces the stresses imposed on the sensor, for an equal radius of curvature
Implementation Method 2
a photosensitive sensor
Data Source
Figure 1~2
Figure 3
Figure 4A~4B
AI summary
The invention relates to an optical detector (100) with a curved detection surface comprising: - a photosensitive sensor (110); - a support (130) imposing a curvature on the photosensitive sensor; and - an adhesive layer (120), disposed between the photosensitive sensor and the support, with a thickness greater than 50 µm. The thick adhesive layer reduces the stresses imposed on the sensor, for a given radius of curvature, and thus reduces the minimum radius of curvature of the photosensitive sensor. This compensates for significant defects in an upstream imaging system.