Five-Lens Optical Imaging System for Compact High-Resolution Design
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Solution Overview
Problem
Conventional compact imaging lens systems for portable electronic products face challenges in achieving high image quality, moderate total track length, and compact design due to the limitations of four lens elements, including increased complexity in manufacturing and reduced flexibility in design.
Innovation Solution
A five-lens element optical imaging lens system is proposed, comprising a first lens with positive refractive power, a second with negative refractive power, a third with variable refractive power, a fourth with aspheric surfaces, and a fifth with a concave image-side surface and at least one inflection point, optimizing the arrangement to reduce total track length and improve image resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If four spherical-surface glass lenses are used to correct chromatic aberration, then chromatic aberration is corrected, but the total track length cannot be reduced and manufacturing complexity increases
Solution Approach 1:
The patent changes the surface geometry parameter from spherical to aspheric for the lens elements. This parameter change allows the lenses to correct chromatic aberration more effectively while reducing the total track length, as aspheric surfaces provide better optical control with fewer elements
Solution Approach 2:
The patent uses composite lens structures where multiple lens elements with different refractive indices and dispersion properties are combined. This allows effective chromatic aberration correction through material composition rather than relying on spherical surface geometry, enabling compact design
2Manufacturing precision
If four spherical-surface glass lenses are adhered together to form a doublet, then chromatic aberration is corrected, but the manufacturing process becomes complicated
Solution Approach 1:
The patent employs aspheric surface parameters instead of spherical surfaces, which can be manufactured using precision molding techniques for plastic lenses. This changes the manufacturing approach from complex spherical lens adherence to more straightforward aspheric lens fabrication and assembly
Solution Approach 2:
The patent utilizes plastic lens materials that can be cost-effectively manufactured using injection molding. This replaces expensive glass lens adherence processes with more economical plastic lens fabrication, simplifying manufacturing while achieving the required optical performance
3Productivity
If conventional four lens elements system is used, then basic imaging function is achieved, but image quality and resolution are insufficient for high standard mobile devices
Solution Approach 1:
The patent segments the optical system into five distinct lens elements instead of four, with each element having specific aspheric surface configurations. This segmentation allows each lens to be optimized for specific aberration corrections, collectively achieving superior image quality and resolution for high-standard mobile devices
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 five-lens system achieves better image quality, reduced total track length, and improved compactness by effectively correcting aberrations and balancing refractive power, while allowing for efficient assembly and use of space, thus meeting the demands of high-resolution and high-performance compact imaging requirements.
Implementation Method 1
an optical imaging lens system comprising five lens elements with refractive power
Data Source
AI summary
This invention provides an optical imaging lens system including five lens elements with refractive power, in order from an object side toward an image side: a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power, a third lens element having a convex object-side surface and a concave image-side surface, a fourth lens element having both surfaces being aspheric, a fifth lens element having a concave image-side surface with at least one inflection point formed thereon. By such arrangement, the total track length and the sensitivity of the optical imaging lens system can be reduced while achieving high image resolution.