Six-Lens Plastic Module Aberration Correction
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Solution Overview
Problem
Miniaturized and lightweight camera modules in mobile communications terminals face challenges in achieving high resolution and brightness due to limitations in implementing lenses made of plastic, which can lead to issues with chromatic aberration and difficulty in creating a bright optical system compared to glass lenses.
Innovation Solution
A lens module comprising six plastic lenses with specific surface configurations and refractive powers, including a first lens with negative power, a second lens with positive power, a third lens with a concave image-side surface, a fourth lens with refractive power, a fifth lens with positive power, and a sixth lens with an inflection point, satisfying conditional equations for TTL, SL, and F No. to improve aberration correction and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If lenses are formed of plastic to reduce weight and cost, then the camera module becomes lighter and cheaper to manufacture, but chromatic aberration deteriorates and it becomes more difficult to implement a bright optical system
Solution Approach 1:
The optical system is divided into six separate plastic lenses with different refractive powers and surface curvatures. Each lens is optimized for specific aberration correction, allowing the system to achieve high resolution and bright imaging performance while using lightweight plastic materials throughout the lens assembly.
Solution Approach 2:
The patent employs a composite optical design using multiple plastic lenses with different refractive indices and Abbe numbers. This composite approach allows correction of chromatic aberration through the combined optical paths of lenses with varying material properties, achieving glass-like performance with plastic materials.
2Manufacturing precision
If five or more plastic lenses are used to achieve high resolution, then the camera module can be miniaturized with high resolution, but manufacturing complexity increases and aberration correction becomes more difficult
Solution Approach 1:
The patent systematically varies key optical parameters including refractive index, Abbe number, surface curvature radii, and thickness for each of the six lenses. By optimizing these parameters within specific ranges, the design achieves aberration correction and high resolution while maintaining manufacturability with plastic materials.
Solution Approach 2:
The patent employs aspherical surfaces on multiple lenses to correct spherical aberration and improve off-axis performance. The aspherical design allows for more compact lens spacing and better aberration control compared to simple spherical surfaces, enabling miniaturization while maintaining high resolution.
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 lens module effectively reduces aberration, enhances resolution, and is lightweight, making it suitable for miniaturized camera modules while maintaining low manufacturing costs.
Implementation Method 1
a first lens having negative refractive power, a second lens of which an object-side surface or an image-side surface is convex, a third lens of which an image-side surface is concave, a fourth lens having refractive power, a fifth lens having refractive power, and a sixth lens having an inflection point formed on an image-side surface or an object-side surface thereof
Data Source
AI summary
A lens module including may include: a first lens having negative refractive power; a second lens of which an object-side surface or an image-side surface is convex; a third lens of which an image-side surface is concave; a fourth lens having refractive power; a fifth lens having refractive power; and a sixth lens having an inflection point formed on an image-side surface or an object-side surface thereof. The first to sixth lenses are disposed in a sequential order from the first lens to the sixth lens.