Light Blocking Sheet Micro Concave Structures Stray Light Suppression
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Solution Overview
Problem
The reflection of stray light by the inner diameter of a light blocking sheet in lens modules reduces imaging quality in portable electronic devices.
Innovation Solution
A light blocking sheet with micro concave structures on its periphery, where the depth of these structures is between 0.01 and 0.05 times the outer ring diameter, and the structures are shaped into triangles, arcs, or trapezoids, effectively reducing the reflection path and area of stray light, thereby improving imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light blocking sheet with a smooth inner diameter surface is used, then the manufacturing process is simple, but stray light reflection occurs and imaging quality deteriorates
Solution Approach 1:
The patent applies local quality by creating micro concave structures only at specific locations (inner diameter surface of the light blocking sheet) rather than modifying the entire surface. This localized modification suppresses stray light reflection where it occurs most problematically while maintaining the simplicity of manufacturing the rest of the component.
Solution Approach 2:
The patent uses curvature by forming micro concave structures with curved surfaces on the inner diameter surface. These curved micro structures effectively scatter and suppress stray light reflection compared to flat surfaces, improving imaging quality without significantly complicating the manufacturing process.
2Object-affected harmful factors
If micro concave structures are added to suppress stray light, then imaging quality improves, but device complexity increases
Solution Approach 1:
The patent creates a porous-like surface structure with multiple micro concave structures on the inner diameter surface of the light blocking sheet. This porous configuration effectively scatters stray light in multiple directions, suppressing reflection while maintaining a relatively simple overall device structure.
Solution Approach 2:
The patent addresses stray light suppression by adding dimensional complexity at the micro-scale surface level rather than increasing macro-scale structural complexity. The micro concave structures modify the surface dimension to scatter light effectively without making the overall device more complex.
3Object-affected harmful factors
If the depth of micro concave structures is increased to suppress reflection, then stray light suppression improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the depth parameter of micro concave structures to achieve effective stray light suppression. By carefully controlling the depth within a specific range, the patent balances reflection suppression effectiveness with manufacturing precision requirements, avoiding excessively deep structures that would be difficult to manufacture.
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 described configuration effectively suppresses stray light reflection, preventing unwanted light spots from reaching the image detector and enhancing imaging quality while ensuring stable machining and assembly processes.
Implementation Method 1
reflection of the stray light by a surface property of an inner diameter of the light blocking sheet
Implementation Method 2
a reflection path of stray light may be effectively damaged, a reflection area of the stray light may be reduced, reflection strength of the stray light may be suppressed
Data Source
AI summary
The disclosure relates to a light blocking sheet and a lens module. The light blocking sheet includes an inner hole. A plurality of micro concave structures are regularly disposed on a periphery of the inner hole. The micro concave structure extends from the periphery of the inner hole to a direction far away from a center of the inner hole. A depth of the micro concave structure is d, an outer ring diameter of the light blocking sheet is D1, d and D1 meet 0.01≤d/D1≤0.05. According to the light blocking sheet of the disclosure, the micro concave structures are disposed on the periphery of the inner hole, so that stray light may be effectively suppressed.