Six-Lens Plastic Optical System for Mobile Camera Resolution
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Solution Overview
Problem
Conventional mobile camera optical systems face challenges in reducing manufacturing costs and weight while achieving high resolution, as using multiple glass lenses is costly and weight-intensive.
Innovation Solution
An optical system comprising six aspherical plastic lenses with specific refractive powers and surface configurations, along with an infrared cut filter, is designed to achieve high resolution and compactness by optimizing aberration correction and chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple glass lenses are used to achieve high resolution, then imaging quality is improved, but manufacturing cost and weight increase
Solution Approach 1:
The patent replaces expensive glass lenses with plastic lenses that can be manufactured at lower cost through injection molding processes. The plastic lenses achieve sufficient optical performance for mobile camera applications without requiring the precision and material cost of glass lenses.
Solution Approach 2:
The patent changes the material parameter from glass to plastic, and modifies the surface geometry from spherical to aspherical. These parameter changes enable cost-effective manufacturing while maintaining or improving optical performance through the aspherical surfaces that better correct aberrations.
2Measurement precision
If multiple glass lenses are used to achieve high resolution, then imaging quality is improved, but weight increases
Solution Approach 1:
The patent substitutes heavy glass lenses with lighter plastic lenses, significantly reducing the weight of the optical system. The plastic material provides sufficient durability and optical performance for mobile applications while being much lighter than glass.
Solution Approach 2:
By changing the material parameter from glass to plastic, the patent achieves weight reduction. The aspherical surface design compensates for potential material limitations, maintaining optical quality while enabling the use of lighter plastic materials.
3Ease of manufacture
If plastic lenses are used to reduce cost and weight, then manufacturing cost and weight are reduced, but aberration correction capability deteriorates
Solution Approach 1:
The patent employs aspherical surfaces on the plastic lenses instead of simple spherical surfaces. The aspherical geometry provides superior aberration correction capabilities, compensating for the lower inherent optical performance of plastic material. This allows cost-effective plastic lenses to achieve image quality comparable to or better than traditional glass lenses.
4Volume of moving object
If aspherical plastic lenses are used to achieve compact design, then optical system size is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent uses aspherical surfaces to achieve better aberration correction in a compact configuration. The aspherical geometry allows for reduced optical system size while maintaining image quality, as the complex surface shape provides multiple aberration corrections in a single lens element rather than requiring multiple separate lenses.
Solution Approach 2:
By changing from spherical to aspherical surfaces, the patent achieves compact design with improved optical performance. The aspherical parameterization allows precise control of the surface shape to correct various aberrations, enabling a smaller number of lens elements to achieve the same or better performance than traditional spherical lens systems.
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 solution enables high-resolution imaging with reduced manufacturing costs and weight, facilitating miniaturization and efficient aberration correction using plastic lenses instead of glass lenses.
Implementation Method 1
a first lens L1 having a positive refractive power and an object-side surface convex toward an object side; a second lens L2 having a negative refractive power and an image-side surface concave toward an image side
Implementation Method 2
both surfaces of the first to sixth lenses may be aspherical surfaces
Implementation Method 3
an optical filter, which is formed of a cover glass coated with an infrared cut filter for blocking excessive infrared rays included in light introduced from the outside
Data Source
AI summary
The present invention relates to an optical system.An optical system of the present invention includes a first lens having a positive refractive power and an object-side surface convex toward an object side; a second lens having a negative refractive power and an image-side surface concave toward an image side; a third lens having a negative refractive power; a fourth lens having a positive refractive power; a fifth lens having a positive refractive power and an image-side surface convex toward the image side; and a six lens having a negative refractive power and an image-side surface concave toward the image side.