Six-Lens Plastic Optical System for High-Resolution Mobile Imaging
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Solution Overview
Problem
Miniaturization and lightweight trends in mobile communications terminals pose challenges for implementing high-resolution and high-performance camera lenses, as traditional glass lenses are heavy and difficult to miniaturize.
Innovation Solution
An optical system comprising six plastic lenses with specific refractive powers and surface shapes, including a first lens convex on the object side, a second lens convex in the object side direction, a third lens convex in the object side direction, a fourth lens convex on the image side, a fifth lens convex on the image side, and a sixth lens with a concave image-side surface, along with an aperture stop between the first and second lenses to reduce sensitivity to optical axis misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If glass lenses are used to achieve high resolution, then image quality is improved, but weight and size increase
Solution Approach 1:
The patent replaces traditional glass lenses with plastic lenses, which are lighter and can be manufactured more easily. The plastic material allows for miniaturization while maintaining optical performance through precise control of refractive indices and surface curvatures of the six-lens configuration.
2Measurement precision
If the number of lenses is increased to five or more to achieve high resolution, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for each lens including refractive indices (e.g., 1.50 < n1 < 1.70 for the first lens), curvature radii, and thickness ratios. These controlled parameter variations allow the six-lens system to achieve high resolution while managing complexity through standardized design rules.
Solution Approach 2:
The patent uses a combination of plastic materials with different optical properties for the six lenses, each with specific refractive index ranges. This composite approach allows optimization of each lens's contribution to overall image quality while maintaining manufacturability and controlling system complexity.
3Weight of moving object
If plastic lenses are used to reduce weight, then manufacturing cost and weight are reduced, but aberration correction becomes more difficult
Solution Approach 1:
The patent assigns different refractive index ranges and surface curvature characteristics to each of the six lenses based on their specific positions and functions in the optical path. For example, the first lens has 1.50 < n1 < 1.70 while the second lens has 1.60 < n2 < 1.80, allowing localized optimization of aberration correction for each element.
Solution Approach 2:
The patent employs precise parameter control including refractive indices, curvature radii ratios (e.g., -0.5 < r2/r1 < -0.1), and thickness ratios for each lens. These parameter specifications enable plastic lenses to achieve aberration correction levels comparable to glass lenses while maintaining the weight and manufacturing advantages of plastic material.
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 improves aberration correction, enhances sensitivity, and maintains high resolution performance, even when imaging close objects, while being suitable for miniaturization and cost-effective manufacturing.
Implementation Method 1
a first lens having positive refractive power and an object-side surface convex in the object side direction; a second lens having negative refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power
Data Source
AI summary
An optical system may include: in order from an object side, a first lens having positive refractive power and an object-side surface convex in the object side direction; a second lens having negative refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power and an image-side surface convex in an image side direction; a fifth lens having negative refractive power and an image-side surface convex in the image side direction; and a sixth lens having negative refractive power and an image-side surface concave in the image side direction, such that bright, high resolution images may be implemented.