Camera Module Nanocrystal Optical Plate for Stray Light Reduction
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Solution Overview
Problem
Conventional camera modules suffer from stray light issues due to optical reflections and diffractions, which degrade image quality.
Innovation Solution
A camera module design incorporating an optical plate with a substrate and anti-reflection layers featuring nanocrystal structure layers and optical-connecting layers, arranged to minimize reflections and enhance transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an optical plate is used in the camera module, then the device structure is simplified and compactness is improved, but stray light is generated due to optical reflections and diffractions
Solution Approach 1:
The patent applies anti-reflection coating to the optical plate to convert the harmful reflections into beneficial transmissions. The anti-reflection coating reduces surface reflections by creating a gradient refractive index layer that minimizes optical impedance mismatch, thereby converting the harmful stray light generation into improved light transmission while maintaining the compact device structure.
Solution Approach 2:
The patent uses composite material structure by combining the optical plate with anti-reflection coating layers. This composite structure integrates the bulk optical functionality of the plate with the surface optical management capabilities of the coating, achieving both compactness and stray light reduction through material composition rather than structural complexity.
2Manufacturing precision
If anti-reflection coating is applied to reduce stray light, then image quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the thickness and refractive index parameters of the anti-reflection coating to achieve effective stray light reduction. By carefully selecting and adjusting these physical parameters, the coating provides significant image quality improvement while maintaining compatibility with existing manufacturing processes, thus balancing performance enhancement with manufacturing feasibility.
3Use of energy by moving object
If multiple anti-reflection layers are added to maximize transmittance, then optical performance is improved, but device thickness increases
Solution Approach 1:
The patent transitions from treating anti-reflection as a single-surface problem to a multi-dimensional solution by applying coatings to both surfaces of the optical plate. This dimensional expansion allows for optimized light transmission through the entire optical path while keeping individual layer thicknesses minimal, achieving high transmittance without significant thickness increase.
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 effectively reduces stray light, enhances image quality, and improves optical transmittance by utilizing the unique refractive indices and structural arrangements of the anti-reflection layers.
Implementation Method 1
The optical plate includes a substrate and at least one anti-reflection layer. The at least one anti-reflection layer is disposed on the image-side surface of the substrate
Implementation Method 2
When a material refractive index of the nanocrystal structure layer is Nc, a material refractive index of the optical-connecting layer is Nf
Data Source
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Figure 1B
Figure 1C
AI summary
A camera module includes an imaging lens assembly, an image sensor and an optical plate. The image sensor is disposed on an image surface of the imaging lens assembly. The optical plate is disposed between the imaging lens assembly and the image sensor, and includes a substrate and at least one anti-reflection layer. The substrate has an object-side surface and an image-side surface, the object-side surface faces towards an object side, the image-side surface faces towards an image side, and the object-side surface is parallel with the image-side surface. The at least one anti-reflection layer is disposed on the object-side surface or the image-side surface of the substrate, the anti-reflection layer includes a nanocrystal structure layer and an optical-connecting layer, wherein the nanocrystal structure layer includes a metal oxide crystal, the optical-connecting layer connects the substrate and the nanocrystal structure layer.