Eight-Lens Optical Imaging Assembly for Thin Portable Devices
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Solution Overview
Problem
The challenge is to design an optical imaging lens assembly for portable electronic devices that is both lighter and thinner while maintaining excellent imaging quality and a large field-of-view.
Innovation Solution
The optical imaging lens assembly consists of eight lenses, with specific refractive powers and surface types, arranged along an optical axis. This configuration includes a first lens with a positive refractive power and a concave object-side surface, a second lens with negative power and a convex image-side surface, and subsequent lenses with varying refractive powers and surface curvatures. The assembly is optimized with parameters such as optical distortion, focal length ratios, and radius of curvature ratios to achieve desired imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to improve imaging quality, then imaging quality is improved, but device complexity and weight increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers, curvature radii, and thicknesses of each lens element. Specific parameter relationships are defined (e.g., focal length ratios, curvature ratios) to optimize the eight-lens configuration for high imaging quality while managing complexity through systematic parameter optimization
Solution Approach 2:
The lens assembly is segmented into eight distinct lens elements with specific functions assigned to each. This segmentation allows complex optical functions to be distributed across multiple simpler elements, improving overall imaging quality while enabling modular design and manufacturing
2Length of moving object
If the lens assembly is made thinner to meet portable device requirements, then portability is improved, but imaging quality and field-of-view may deteriorate
Solution Approach 1:
The patent employs a nested configuration where lens elements are arranged in a compact sequence along the optical axis with minimized spacing. The eight lenses are nested closely together, allowing the assembly to achieve thin profile while maintaining sufficient optical path length for high-quality imaging and wide field-of-view
Solution Approach 2:
The patent optimizes the lateral dimensions (curvature radii and aperture sizes) to compensate for reduced axial thickness. By adjusting the curvature radii ratios and aperture diameters of the lens elements, the design achieves thin form factor while maintaining large field-of-view and high imaging quality through enhanced lateral optical parameters
3Weight of moving object
If the lens assembly is made lighter to meet portable device requirements, then portability is improved, but imaging quality and structural strength may deteriorate
Solution Approach 1:
The patent optimizes the weight by controlling the thickness and material properties of each lens element. Specific parameter relationships (e.g., thickness ratios, curvature radii) are defined to minimize weight while maintaining the optical performance required for high imaging quality and structural integrity
4Area of stationary object
If the field-of-view is increased to meet modern camera requirements, then imaging coverage is improved, but optical distortion and aberrations increase
Solution Approach 1:
The patent segments the optical correction function across multiple lens elements. Each of the eight lenses contributes to correcting specific aberrations, allowing the system to achieve wide field-of-view while maintaining low distortion through distributed correction rather than relying on a single element
Solution Approach 2:
The patent employs specific parameter relationships among the lens elements (curvature radii ratios, focal length ratios, spacing distances) to control and minimize optical distortion. By optimizing these parameters, the system achieves wide field-of-view with minimal distortion and aberrations
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 achieves a high imaging quality with minimal optical distortion (|ODT| < 2.6%) and a large field-of-view (FOV ≥ 90°), while being compact and lightweight, making it suitable for portable electronic devices.
Implementation Method 1
a first lens, having a positive refractive power, an object-side surface of the first lens being a concave surface
Implementation Method 2
a second lens, having a negative refractive power, an image-side surface of the second lens being a convex surface
Data Source
AI summary
An optical imaging lens assembly having, sequentially along an optical axis from an object side to an image side, a first lens, having a positive refractive power, an object-side surface of the first lens being a concave surface; a second lens, having a negative refractive power, an image-side surface of the second lens being a convex surface; a third lens, having a refractive power; a fourth lens, having a refractive power; a fifth lens, having a refractive power; a sixth lens, having a refractive power; a seventh lens, having a refractive power; and an eighth lens, having a refractive power.