Tapered Light Blocking Sheet for Lens Flare and Shading Balance
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Solution Overview
Problem
Existing light blocking sheets in imaging lens assemblies of portable electronic devices face a trade-off between enhancing anti-noise ability in accent light sources and preventing excessive shading, which degrades image quality.
Innovation Solution
A light blocking sheet with a central opening and tapered light blocking structures defining circumscribed and inscribed circles, with controlled area ratios and dimensions, is integrated with optical lens elements to optimize light transmission and blocking, maintaining image quality under harsh lighting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the extended heights of the light blocking structures are increased, then the anti-noise ability of the imaging lens assembly is enhanced, but the image quality decreases due to excessive shading
Solution Approach 1:
The light blocking structures are designed with tapered shapes where the cross-sectional area varies along the extended height. The structures have different light blocking areas at different positions, creating local quality variations. This allows the structures to provide effective light blocking at the base while reducing shading effects at the top, thus improving anti-noise ability without excessively degrading image quality.
Solution Approach 2:
The patent optimizes specific parameters including the extended height of light blocking structures (0.05 to 0.15 times the focal length), the area ratio of light blocking portions to total area (0.05 to 0.2), and the tapered shape parameters. By changing these parameters within specific ranges, the design achieves a balance between anti-noise performance and image quality, preventing excessive shading while maintaining noise reduction effectiveness.
2Reliability
If the area of light blocking portions is increased, then the anti-noise ability is improved, but the light transmission is reduced causing image quality degradation
Solution Approach 1:
The patent establishes a specific parameter range for the area ratio of light blocking portions to total area (0.05 to 0.2). By controlling this parameter within the specified range, the design achieves optimal balance between light blocking effectiveness for noise reduction and sufficient light transmission for maintaining image quality, preventing both excessive noise and insufficient illumination.
Data Source
AI summary
A light blocking sheet includes a central opening and a plurality of light blocking structures. A central axis passes through the central opening. The light blocking structures surround an inner peripheral surface of the central opening, the light blocking structures are tapered and extended from the central opening towards a direction close to the central axis, and the light blocking structures are for defining a circumscribed circle and an inscribed circle, wherein a plurality of inscribed circle ends of the light blocking structures close to the central axis are contacted with the inscribed circle, and a plurality of circumscribed circle ends of the light blocking structures away from the central axis are contacted with the circumscribed circle.