Sawtooth Light-Shielding Member for Camera Stray Light Control
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Solution Overview
Problem
Existing camera modules face challenges in effectively reducing stray light, which affects imaging quality.
Innovation Solution
A light-shielding member with a sawtooth structure is introduced, featuring alternating peaks and valleys in its cross-section, with sawtooth edges directed towards the center of a light-transmitting hole to reflect stray light away and minimize reflection at valleys, enhancing structural strength and reducing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light-shielding member with a simple structure is used, then manufacturing is easier and cost is lower, but stray light reduction effect is insufficient
Solution Approach 1:
The patent applies curvature by designing the light-shielding member with a sawtooth cross-section instead of a simple flat or rounded shape. The sawtooth structure features inclined surfaces that curve light paths, effectively redirecting stray light away from the optical axis while maintaining manufacturability through standard molding processes.
Solution Approach 2:
The patent transitions from a two-dimensional flat light-shielding surface to a three-dimensional sawtooth structure with multiple inclined surfaces. This dimensional complexity enables the structure to address stray light from multiple angles simultaneously, improving stray light reduction without significantly complicating the manufacturing process.
2Object-affected harmful factors
If the light-shielding member structure is made more complex to reduce stray light, then stray light reduction effect improves, but manufacturing difficulty and cost increase
Solution Approach 1:
The sawtooth structure uses inclined surfaces that guide light through geometric curvature rather than requiring complex multi-component assemblies. This single-integral design achieves sophisticated light control while remaining compatible with standard injection molding or stamping processes.
Solution Approach 2:
The light-shielding member integrates multiple functions into a single component: it blocks direct light paths, reflects stray light through its sawtooth surfaces, and maintains structural integrity. This multi-functionality reduces the need for additional separate components, simplifying manufacturing despite the enhanced stray light reduction capability.
3Ease of manufacture
If conventional light-shielding structures are used, then manufacturing is simple, but structural strength and resistance to deformation are insufficient
Solution Approach 1:
The sawtooth cross-section distributes mechanical stresses across multiple inclined surfaces rather than concentrating them on flat planes. This geometric distribution enhances structural strength and resistance to deformation during assembly and transportation while maintaining compatibility with standard manufacturing processes.
Solution Approach 2:
The sawtooth structure divides the light-shielding member's cross-section into multiple segments or zones, each contributing to overall structural rigidity. This segmentation effect strengthens the member without requiring additional support components, preserving manufacturing simplicity.
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 sawtooth structure effectively disperses and shields stray light, improving imaging quality by minimizing reflections and maintaining structural integrity during assembly and transportation.
Implementation Method 1
The sawtooth cross-section has a first sawtooth edge and a second sawtooth edge between two adjacent peaks, the first sawtooth edge and the second sawtooth edge are disposed at an included angle and are both connected to a valley, and an extending direction of the first sawtooth edge is directed to a center of the light-transmitting hole
Data Source
AI summary
A light-shielding member, a camera module, and an electronic device are provided. The light-shielding member includes a light-shielding body and a sawtooth structure. The light-shielding body has a first end surface and a second end surface opposite to the first end surface, and the light-shielding body defines a light-transmitting hole extending through the first end surface and the second end surface. The sawtooth structure is disposed on a wall of the light-transmitting hole, and a cross-section of the sawtooth structure taken along a direction perpendicular to a thickness direction of the light-shielding member is a sawtooth cross-section. The sawtooth cross-section has alternating peaks and valleys disposed in a circumferential direction of the light-transmitting hole. The sawtooth cross-section has a first sawtooth edge and a second sawtooth edge between two adjacent peaks, and an extending direction of the first sawtooth edge is directed to a center of the light-transmitting hole.