Composite Substrate Assembly for Warpage Prevention in Lens Modules
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Solution Overview
Problem
Conventional lens modules are inadequate for high-end miniaturized cameras due to limitations in maintaining imaging quality and preventing warpage, which affects the performance of image-capturing devices as pixel sizes decrease and devices become more compact.
Innovation Solution
A lens module design featuring a substrate assembly with a main body made of glass and a supporting layer made of polymer composites, where the supporting layer is formed on the rear surface or both surfaces, extending parallel to the lens units and having varying stiffness to absorb stress and prevent warpage, ensuring mechanical strength and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional lens module is used, then the device can be miniaturized, but the imaging quality deteriorates and warpage occurs
Solution Approach 1:
The substrate assembly uses a composite structure combining glass main body with polymer composite supporting layer. The glass provides optical transparency and structural integrity, while the polymer layer provides flexibility and stress absorption, preventing warpage and maintaining imaging quality in miniaturized devices
Solution Approach 2:
The supporting layer is strategically positioned only on specific regions of the substrate assembly - either on the rear surface or on peripheral segments - rather than covering the entire surface. This localized support provides necessary mechanical strength where needed while maintaining optical performance and preventing warpage without interfering with light paths
2Strength
If the supporting layer covers the entire surface, then mechanical strength is improved, but light transmission is blocked
Solution Approach 1:
The supporting layer is divided into separate functional regions: some areas have supporting layers for mechanical strength, while other areas (particularly the central optical path regions) are left without supporting layers to allow uninterrupted light transmission. This segmentation enables both structural integrity and optical performance
Solution Approach 2:
The supporting layer is applied locally only where mechanical support is needed (peripheral regions or rear surface) rather than uniformly across the entire substrate. This localized application provides necessary strength while leaving central optical paths clear for light transmission
Data Source
AI summary
A lens module is disclosed. The lens module includes a substrate assembly and an array of lens units. The substrate assembly includes a main body and a supporting layer formed on the substrate assembly. The main body has a front surface, a rear surface opposite to the front surface, and at least one lateral surface connecting the front surface to the rear surface. The supporting layer has a planar configuration and is formed on the main body. The main body is made of a first material and the supporting layer is made of a second material different from the first material.