Seven-Lens Plastic Optical Imaging System for High Resolution and Low Weight
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Solution Overview
Problem
Existing optical imaging systems face challenges in achieving a high level of resolution while maintaining a lightweight design, particularly for applications in unmanned aerial vehicles and vehicle monitoring systems.
Innovation Solution
The optical imaging system comprises seven lenses, including a first lens with positive refractive power, a second lens with convex surfaces, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with negative refractive power and an inflection point on its image-side surface, and a seventh lens with negative refractive power and an inflection point on its image-side surface, sequentially disposed from the object side toward the imaging plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lenses are made of glass to achieve high resolution, then the resolution level is improved, but the weight of the optical imaging system increases significantly
Solution Approach 1:
The patent changes the material parameter from glass to plastic, specifically using plastic lenses with refractive indices between 1.5 and 1.7. This material substitution maintains the optical performance and resolution capabilities while dramatically reducing the weight of the optical imaging system, making it suitable for portable and mobile applications.
2Weight of moving object
If lenses are made of plastic to reduce weight, then the weight is reduced, but the resolution level deteriorates
Solution Approach 1:
The patent applies local quality by giving each lens element specific surface configurations (convex or concave object-side and image-side surfaces) and assigning different refractive powers (positive or negative) to different lens positions. This localized optimization of lens characteristics compensates for the inherent limitations of plastic material, achieving high resolution through precise optical design rather than relying solely on material properties.
Solution Approach 2:
The optical imaging system uses a composite approach by combining multiple plastic lens elements with different optical properties (different refractive powers and surface configurations) to achieve the collective optical performance that would traditionally require glass. The system integrates seven plastic lenses with carefully designed varying characteristics to compensate for individual material limitations.
3Measurement precision
If multiple lenses are added to improve resolution, then the resolution level is improved, but the device complexity increases
Solution Approach 1:
The patent segments the optical system into seven distinct plastic lens elements, each with specific refractive powers and surface configurations. This segmentation allows the complex optical function of achieving high resolution to be distributed across multiple simpler components, making the overall system more manageable while maintaining high performance through the collective action of individual lens elements.
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
This configuration achieves a high level of resolution while maintaining a lightweight design, suitable for small terminal applications, and effectively corrects various aberrations and chromatic aberrations.
Implementation Method 1
a first lens including a positive refractive power; a second lens including a positive refractive power; a third lens including a negative refractive power... the first to seventh lenses are sequentially disposed from an object side toward an imaging plane
Data Source
AI summary
An optical imaging system includes first through seventh lenses. The first lens includes positive refractive power, the second lens includes a positive refractive power, the third lens includes a negative refractive power, an object-side surface thereof being convex, the fourth lens includes a positive refractive power, the fifth lens includes a negative refractive power, the sixth lens includes a negative refractive power, and the seventh lens includes a negative refractive power and having an inflection point formed on an image-side surface thereof. The first to seventh lenses are sequentially disposed from an object side toward an imaging plane.