Plastic Lens Rugged Region Stray Light Suppression
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Solution Overview
Problem
Miniaturized plastic lenses in compact optical systems fail to suppress stray light effectively, leading to poor image quality, which is inadequate for high-end camera functionalities.
Innovation Solution
The design incorporates a rugged region with protrusions on the outer portion of the plastic lens, which surrounds the optically effective portion, with specific dimensional relationships between the central thickness, outermost diameter, and radial length of the protrusions to enhance light suppression and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the plastic lens is miniaturized for compact optical systems, then the weight of the optical system is reduced, but the ability to suppress unexpected light deteriorates
Solution Approach 1:
The outer portion of the lens surface is segmented into multiple protrusions, creating a rugged region that disrupts stray light paths. This segmentation allows the lens to maintain compact size while effectively suppressing unexpected light through the distributed protrusion structures.
Solution Approach 2:
The rugged region with protrusions is localized to specific areas of the lens outer portion, while the optically effective portion maintains its original quality for proper light transmission. This local modification suppresses stray light without compromising the overall optical performance of the miniaturized lens.
2Device complexity
If the outer portion is formed in a simple surface structure, then the design is simplified, but the suppression of unexpected light is insufficient
Solution Approach 1:
The lens surface is divided into regions with different qualities: the optically effective portion maintains a simple structure for ease of design, while the outer portion features a rugged region with protrusions specifically for stray light suppression. This localized differentiation resolves the contradiction between simplicity and effectiveness.
Solution Approach 2:
The outer portion is segmented into multiple protrusions arranged in a rugged region, transforming a simple surface into one that actively suppresses unexpected light. The segmentation creates complexity only where needed for stray light control.
3Object-affected harmful factors
If protrusions are added to the outer portion, then unexpected light is suppressed, but the manufacturing complexity increases
Solution Approach 1:
The protrusions are designed with specific dimensional relationships (radial length L between 0.3-0.7 times central thickness CT, and positioned at specific distances from the center) that can be predetermined in the molding process. This preliminary design of dimensions allows for easier manufacturing by reducing the need for complex post-processing.
Solution Approach 2:
The protrusion dimensions and positions are optimized within specific parameter ranges (L/CT ratio, distance from center) to balance stray light suppression effectiveness with manufacturing ease. These parameter specifications guide the molding process while achieving the desired optical performance.
Data Source
AI summary
A plastic lens includes a first surface and a second surface. The second surface is opposite to the first surface. At least one of the first surface and the second surface includes an optically effective portion and an outer portion. The outer portion surrounds the optically effective portion. The outer portion includes a rugged region and an abutting region. The rugged region has a plurality of protrusions thereon. The abutting region is disposed farther from a center of the plastic lens than the rugged region.