Camera Sensor Anti-Reflective Layer for Stray Light Suppression
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Solution Overview
Problem
Camera modules suffer from stray light generation due to light diffraction and reflection between the micro lens arrays layer and optical plate, which degrades image quality and light-gathering ability.
Innovation Solution
Incorporation of an anti-reflecting layer with an irregular nano-crystallite structure or optical multi-membrane stacking structure in the camera module, which includes an optical connecting layer to reduce light reflection and improve light-gathering ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a micro lens arrays layer is disposed on the image sensor to converge light, then light-gathering ability is improved, but stray light is generated due to light diffraction and reflection
Solution Approach 1:
The patent applies the anti-reflecting layer to convert the harmful light reflection and diffraction into beneficial effect. The irregular nano-crystallite structure and optical multi-membrane stacking structure are designed to specifically target and eliminate stray light while preserving the light-gathering function of the micro lens arrays layer, thereby converting the harmful optical interference into an improved optical performance.
Solution Approach 2:
The patent changes the optical parameters of the micro lens arrays layer by introducing an anti-reflecting layer with specific structural characteristics (irregular nano-crystallite structure or optical multi-membrane stacking structure). These parameter changes modify the light interaction properties to reduce diffraction and reflection while maintaining convergence capability.
2Object-affected harmful factors
If conventional anti-reflecting layers are used, then some reflection is reduced, but they cannot effectively eliminate stray light and paddle flare
Solution Approach 1:
The patent employs composite material structures for the anti-reflecting layer, specifically using irregular nano-crystallite structure combined with optical connecting layer, or optical multi-membrane stacking structure. These composite structures provide superior performance in eliminating stray light and paddle flare compared to conventional single-layer anti-reflecting coatings.
Solution Approach 2:
The patent applies local quality by designing the anti-reflecting layer with specific local structural characteristics (irregular nano-crystallite morphology or multi-membrane stacking) that are optimized for eliminating stray light. The structure is tailored to address the specific optical problems at different locations and depths within the optical path.
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
Effectively removes stray light, enhances light transmittance and color rendition, and improves image quality by reducing reflections and secondary reflections.
Implementation Method 1
the imaging light L reflects between the micro lens arrays layer ML and an optical plat F along a light path L2 so as to generate stray light SL
Implementation Method 2
The anti-reflecting layer is disposed on a surface of at least one of the light filtering layer and the micro lens arrays layer
Implementation Method 3
The micro lens arrays layer is for converging an energy of the imaging light into the photoelectric converting layer
Implementation Method 4
The light filtering layer is disposed between the photoelectric converting layer and the micro lens arrays layer, and the light filtering layer is for absorbing a light at a certain wavelength region of the imaging light
Implementation Method 5
The photoelectric converting layer is for converting a light signal of an imaging light to an electric signal
Data Source
AI summary
A camera module includes an imaging lens assembly module and an image sensor. The image sensor is disposed on an image surface of the imaging lens assembly module and includes a photoelectric converting layer, a micro lens arrays layer, a light filtering layer and an anti-reflecting layer. The photoelectric converting layer is for converting a light signal to an electric signal. The micro lens arrays layer is for converging an energy of the imaging light into the photoelectric converting layer. The light filtering layer is for absorbing a light at a certain wavelength region of the imaging light. The anti-reflecting layer is disposed on a surface of at least one of the light filtering layer and the micro lens arrays layer and includes an irregular nano-crystallite structure layer and an optical connecting layer. The optical connecting layer is connected to the irregular nano-crystallite structure layer.