Five-Lens Optical Imaging System for Compact Smartphone Design
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Solution Overview
Problem
Traditional lens designs for portable electronic devices, such as smartphones, face a trade-off between achieving high image quality and minimizing size, as lens assemblies with high image quality typically require larger sizes, making it challenging to design compact devices with sufficient space for modules and terminals.
Innovation Solution
An optical imaging system comprising five lenses with specific refractive powers and surface configurations, including aspheric surfaces, is designed to minimize the lens assembly length while maintaining good image quality and sufficient space, achieved by optimizing the refractive power, surface shape, center thickness, and on-axis spaced intervals between lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional lens designs are used to achieve high image quality, then image quality is improved, but lens assembly length increases
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers of individual lenses (first lens: positive, second and third lenses: negative, fourth and fifth lenses: positive), adjusting surface curvatures (convex and concave surfaces), and controlling center thicknesses to achieve compact lens assembly length while maintaining high image quality through precise parameter control
Solution Approach 2:
The patent utilizes aspheric surfaces on the lenses to replace traditional spherical surfaces, enabling better control of light paths and reduction of optical aberrations within a shorter focal length, thus achieving compact lens assembly length without compromising image quality
2Length of stationary object
If lens assembly length is reduced for compact design, then device thickness is decreased, but image quality deteriorates
Solution Approach 1:
The patent segments the optical system into five distinct lenses with alternating positive and negative refractive powers, allowing each lens to contribute specifically to correcting optical aberrations while maintaining a compact overall length, thereby achieving both reduced size and high image quality
Solution Approach 2:
The patent employs composite optical design by combining lenses with different refractive powers and aspheric surfaces, creating a composite optical system that achieves superior image quality correction within a compact form factor
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 system achieves ultra-thinness, reduced aberrations, and improved image quality, facilitating compact and efficient production of portable electronic devices with enhanced imaging capabilities.
Implementation Method 1
an optical imaging system includes, sequentially from an object side to an image side along an optical axis, a first lens having refractive power; a second lens having negative refractive power; a third lens having negative refractive power; a fourth lens having refractive power
Data Source
AI summary
The present disclosure discloses an optical imaging system including, sequentially from an object side to an image side along an optical axis, a first lens having refractive power; a second lens having negative refractive power; a third lens having negative refractive power; a fourth lens having refractive power, a convex object-side surface and a concave image-side surface; and a fifth lens having refractive power. A distance TTL along the optical axis from an object-side surface of the first lens to an imaging plane of the optical imaging system and half of a diagonal length ImgH of an effective pixel area on the imaging plane of the optical imaging system satisfy: 1.0<TTL/ImgH<1.5.