Sawtooth Aperture Wall Structure for Camera Stray Light Shielding
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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 specific edge orientations and rounded corners to reflect stray light away from the optical path while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
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 light-shielding member is segmented into multiple functional regions: a light-shielding body with a light-transmitting hole, and a sawtooth structure disposed on the wall of the light-transmitting hole. The sawtooth structure is further segmented into multiple peaks and valleys around the circumference, creating multiple light reflection surfaces that work together to reduce stray light effectively.
Solution Approach 2:
The sawtooth structure employs asymmetric geometry with specific edge orientations. The first sawtooth edge is oriented at a first angle to the thickness direction, while the second sawtooth edge is oriented at a second angle, creating an asymmetric profile that optimally directs reflected light away from the optical path. This asymmetric design enhances stray light reduction compared to symmetric structures.
2Object-affected harmful factors
If the sawtooth structure has sharp edges, then light reflection is more effective, but structural strength is reduced
Solution Approach 1:
The sawtooth structure incorporates rounded corners at the peaks and/or valleys instead of sharp edges. This curvature reduces stress concentration points that would otherwise weaken the structure, while still maintaining effective light reflection capabilities. The rounded geometry distributes mechanical stress more evenly, enhancing structural integrity without significantly compromising optical performance.
3Object-affected harmful factors
If the sawtooth edges are oriented at larger angles, then light shielding is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies optimized angle ranges for the sawtooth edges: the first angle is between 10°-70° and the second angle is between 10°-30°. These parameter ranges balance light shielding effectiveness with manufacturability. The angled ranges are chosen to achieve adequate stray light reduction while remaining feasible for standard manufacturing processes, avoiding excessively tight tolerance requirements.
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, enhancing imaging quality by minimizing reflections and ensuring the camera module's structural stability during assembly and use.
Implementation Method 1
The sawtooth structure is disposed on a wall of the light-transmitting hole... effectively disperses and shields stray light, enhancing imaging quality by minimizing reflections
Data Source
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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.