Seven-Lens Optical Imaging Assembly for Wide-Angle High Resolution
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Solution Overview
Problem
Portable devices require optical imaging lens assemblies that balance miniaturization with high imaging quality and wide-angle capabilities, especially with the increasing size and pixel count of CMOS chips, while maintaining compactness and good image resolution.
Innovation Solution
An optical imaging lens assembly comprising seven lenses, with specific refractive powers, surface shapes, and spacings, including aspheric surfaces, to achieve a large image plane, wide angle, and high resolution, while maintaining a compact structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size and pixel count of CMOS chips are increased, then imaging quality is improved, but the overall size of the imaging lens assembly increases
Solution Approach 1:
The imaging lens assembly is divided into seven separate lens elements (first lens to seventh lens) with different refractive powers and surface curvatures. Each lens element contributes to correcting specific aberrations and focusing light, allowing the system to achieve high imaging quality with a compact overall structure that fits portable devices.
Solution Approach 2:
Different lens elements have specifically designed local optical properties: the first lens has negative refractive power with specific curvature ratios to control aberrations, while subsequent lenses have positive refractive powers with optimized surface curvatures. Each lens element's shape and refractive index are locally optimized to correct specific types of optical aberrations, enabling compact high-quality imaging.
2Area of stationary object
If wide-angle capability is increased, then field of view is improved, but distortion and aberrations increase
Solution Approach 1:
The seven-lens segmented structure allows distribution of aberration correction functions across multiple elements. The first lens with negative power and specific curvature ratios (0.3<R1/R2<1.5) controls peripheral aberrations, while subsequent lenses with positive powers address central and intermediate field aberrations, enabling wide field of view with controlled distortion.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements with specifically optimized conic constants and higher-order aspheric coefficients. These parameter changes in surface geometry allow correction of wide-angle aberrations including coma, astigmatism, and distortion, achieving a field of view greater than 100 degrees while maintaining image quality across the entire field.
3Volume of moving object
If miniaturization is achieved, then device compactness is improved, but imaging performance deteriorates
Solution Approach 1:
Each of the seven lens elements has locally optimized optical properties including specific refractive indices, Abbe numbers, center thicknesses, and surface curvatures. The first lens has negative power with controlled curvature ratios, while lenses 2-7 have positive powers with optimized parameters. This local optimization enables compact sizing while maintaining high image resolution through precise aberration correction at each stage of light propagation.
Solution Approach 2:
Multiple lens elements employ aspheric surfaces with specifically designed curvature profiles including conic sections and higher-order aspheric terms. These curved surfaces enable compact lens element dimensions while correcting spherical aberration, coma, and other monochromatic aberrations, achieving high resolution in a miniaturized form factor suitable for portable 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 lens assembly effectively compensates for aberrations, providing improved image quality, high pixels, and a larger field of view, suitable for portable electronic devices with compact designs.
Implementation Method 1
an optical imaging lens assembly which includes, sequentially from an object side to an image side along an optical axis, a first lens having negative refractive power; a second lens having refractive power; a third lens; a fourth lens having refractive power
Data Source
AI summary
The present disclosure discloses an optical imaging lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens having negative refractive power; a second lens having refractive power; a third lens; a fourth lens having refractive power, a convex image-side surface and a concave image-side surface; a fifth lens having refractive power and a concave object-side surface; a sixth lens; and a seventh lens. Half of a diagonal length ImgH of an effective pixel area on an imaging plane of the optical imaging lens assembly satisfies: ImgH≥5.20 mm.