Light Blocking Sheet Basin Structures for Lens Deformation
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Solution Overview
Problem
The existing imaging lens assemblies in portable electronic devices face challenges in maintaining imaging quality due to deformation caused by residual stress during the stamping process, leading to potential stray light issues and sensitivity to external factors like impact, temperature, and humidity variations.
Innovation Solution
The imaging lens assembly incorporates a light blocking sheet with basin structures arranged around the optical axis, which reduces deformation and displacement of the through hole, maintaining imaging quality over time and resisting external influences by dispersing residual stress and adjusting the clear aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a light blocking sheet is used in the imaging lens assembly, then stray light is blocked and imaging quality is improved, but residual stress from the stamping process causes deformation and displacement of the through hole
Solution Approach 1:
The patent applies local quality by creating basin structures at specific locations around the through hole perimeter. These basin structures are localized stress-relief features that selectively address the deformation problem at the through hole edges without affecting the overall light blocking function. The basins are positioned at intervals around the optical axis, providing targeted stress management where it is most needed.
Solution Approach 2:
The light blocking sheet is segmented by introducing multiple basin structures that divide the continuous sheet into distinct regions. These basins create segmented stress distribution patterns that prevent uniform deformation across the entire sheet. The segmentation allows different portions of the sheet to accommodate stress independently, reducing overall through hole displacement.
2Stability of the object's composition
If the light blocking sheet is made more rigid to maintain shape, then deformation is reduced, but sensitivity to external factors like impact, temperature, and humidity increases
Solution Approach 1:
The patent changes the structural parameters of the light blocking sheet by introducing basin structures with specific geometric characteristics. These basins modify the stress distribution parameters and flexibility characteristics of the sheet, allowing it to maintain shape stability while accommodating thermal expansion, humidity changes, and impact forces through controlled deformation in the basin regions.
Solution Approach 2:
The basin structures serve as pre-designed stress absorption zones that cushion the light blocking sheet against external factors before damage occurs. When impact, temperature changes, or humidity variations occur, the basin structures deform first, absorbing the stress and protecting the through hole and overall sheet integrity from severe deformation.
3Manufacturing precision
If basin structures are added to reduce deformation, then manufacturing complexity increases, but imaging quality is maintained
Solution Approach 1:
The basin structures are formed as integral features of the thin light blocking sheet, utilizing the sheet's inherent flexibility. The basins are created through stamping or molding processes that form smooth, continuous curved surfaces rather than adding discrete components. This approach maintains the thin-film nature of the light blocking sheet while incorporating stress-management functionality.
Data Source
AI summary
An imaging lens assembly has an optical axis, and includes a plurality of optical elements. The optical elements include a light blocking sheet, and the light blocking sheet includes a through hole surface, a first surface, a second surface, a peripheral surface and a plurality of basin structures. The through hole surface surrounds the optical axis. The first surface and the second surface are connected to and surround the through hole surface. The peripheral surface is connected to the first surface and the second surface, and the peripheral surface is farther from the optical axis than the through hole surface from the optical axis. The basin structures are arranged in interval and around the optical axis, each of the basin structures is caved in from the first surface to the second surface, and each of the basin structures protrudes on the second surface.