Six-Lens Plastic Optical System for Chromatic Aberration Correction
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Solution Overview
Problem
Miniaturization and lightweight trends in mobile communications terminals pose challenges in implementing camera modules with high resolution and performance, particularly due to difficulties in achieving a bright optical system using plastic lenses, which can suffer from chromatic aberration issues.
Innovation Solution
An optical system comprising six plastic lenses with specific refractive powers and surface shapes, including aspherical surfaces, that satisfy certain conditional equations to improve aberration correction and sensitivity, while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If plastic lenses are used to reduce weight and cost, then the camera module becomes lighter and cheaper, but chromatic aberration increases and optical brightness decreases
Solution Approach 1:
The patent divides the optical system into six distinct plastic lens elements with specific refractive powers and surface curvatures. By segmenting the optical function across multiple elements rather than using a single lens, the system can correct chromatic aberration through the combined optical paths while maintaining the weight advantages of plastic materials.
Solution Approach 2:
The patent specifies precise parameter ranges for each lens element including refractive power, surface curvature radii, and thickness ratios (e.g., 0.05 < r1/f < 0.15, -0.30 < r2/f < -0.10). By carefully controlling these parameters and their relationships, the system optimizes aberration correction in plastic lenses while maintaining lightweight construction.
2Ease of manufacture
If plastic lenses are used to reduce weight, then manufacturing cost decreases, but manufacturing precision for aberration correction becomes more difficult
Solution Approach 1:
The patent establishes specific parameter ranges and relationships (e.g., focal length ratios, curvature radii constraints, thickness proportions) that define the optimal design space for plastic lenses. These parameter specifications provide clear manufacturing targets and tolerances, enabling precise aberration correction through controlled variations in lens geometry rather than relying on material perfection.
Solution Approach 2:
The patent designs a universal six-lens configuration that can be manufactured using standard plastic injection molding processes. The specific arrangement of positive and negative power elements creates a modular design that achieves high-resolution imaging through geometric optimization rather than requiring specialized materials or complex manufacturing techniques.
3Measurement precision
If five or more lenses are used to achieve high resolution, then imaging performance improves, but device complexity and size increase
Solution Approach 1:
The patent segments the optical function into six specialized lens elements, each contributing specific aberration correction functions. This segmentation allows the system to achieve high resolution by distributing optical tasks across multiple elements rather than requiring a single complex lens, thereby managing overall system complexity through functional decomposition.
Solution Approach 2:
The patent specifies precise parameter relationships (e.g., focal length ratios between elements, curvature radii constraints, spacing proportions) that optimize the six-lens configuration. These parameter constraints provide a structured framework that simplifies design and assembly while achieving high-resolution imaging, reducing complexity through standardized design rules.
4Reliability
If multiple plastic lenses are used to correct aberration, then optical performance improves, but the number of components and assembly difficulty increase
Solution Approach 1:
The patent divides aberration correction into six specialized lens elements, each optimized for specific optical functions. This segmentation enables targeted correction of different aberration types (spherical, chromatic, coma) through dedicated elements, improving overall reliability while maintaining manageable complexity through functional specialization.
Solution Approach 2:
The six-lens configuration serves multiple functions simultaneously: focusing light, correcting spherical aberration, correcting chromatic aberration, and controlling field curvature. This multi-functionality reduces the need for additional corrective elements, achieving high reliability with a compact six-element design rather than requiring more components.
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 optical system enhances optical performance by correcting aberrations and increasing sensitivity, thereby supporting high-resolution imaging in a compact, lightweight form factor, reducing manufacturing costs and improving efficiency.
Implementation Method 1
a first lens having positive refractive power; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power
Data Source
AI summary
An optical system may include: a first lens having positive refractive power; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; a sixth lens having positive or negative refractive power, an image-side surface thereof being concave toward an imaging surface.