Five-Lens Optical Imaging Assembly for Compact High-Quality Imaging

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Solution Overview

Problem

The challenge is to design an optical imaging lens assembly for portable electronic products that balances miniaturization with high imaging quality, given the constraints of limited size and increased pixel density in miniaturized devices.

Innovation Solution

The optical imaging lens assembly consists of five lenses with specific refractive powers, surface shapes, and spacings along the optical axis, including a first lens with positive refractive power and a convex object-side surface, a second lens with refractive power and a concave image-side surface, a third lens with positive or negative refractive power, a fourth lens with positive or negative refractive power, and a fifth lens with negative refractive power, optimized to achieve a compact form factor and large imaging area while maintaining high image quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the lens assembly is miniaturized to fit portable electronic products, then the total length of the lens assembly is reduced, but the imaging quality deteriorates due to limited design space and increased pixel density requirements

Engineering Contradiction:

Improvetotal length of lens assemblyVSAvoidimaging quality

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The lens assembly is divided into five distinct lens elements (first lens E1, second lens E2, third lens E3, fourth lens E4, and fifth lens E5), each with specific refractive power and surface curvature characteristics. This segmentation allows independent optimization of each element's function while maintaining a compact overall structure, resolving the contradiction between miniaturization and imaging quality by distributing optical functions across multiple specialized components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent specifies precise parameter relationships including focal length ratios (0.6≤f1/f≤0.99), curvature radius ratios (0.2≤R1/R4≤1.0), and spacing ratios (0.2≤T12/T34≤1.0). These parameter changes and optimizations enable the compact lens assembly to achieve high imaging quality by carefully controlling the optical path and reducing aberrations despite the limited total length.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If the size of each pixel in the photosensitive element is reduced to increase pixel count, then the number of pixels is increased, but the imaging quality requirement becomes more stringent

Engineering Contradiction:

Improvenumber of pixelsVSAvoidimaging quality requirement

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The patent employs aspheric surfaces on multiple lens elements, including the object-side surface of the first lens (convex) and the image-side surface of the second lens (concave). These curved surfaces are optimized to correct optical aberrations that become more pronounced with higher pixel density, thereby maintaining imaging quality requirements while supporting increased pixel counts.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The lens assembly uses multiple lens materials with different refractive indices and Abbe numbers (VD3 for the third lens, VD4 for the fourth lens). This composite approach allows chromatic aberration correction and optimization of light transmission across the visible spectrum, meeting stringent imaging quality requirements enabled by high-density pixel arrays.

Inventive Principle:

Principle #40Composite materials

3Manufacturing precision

If novel optical materials are researched and applied, then the imaging quality can be improved, but the design complexity increases

Engineering Contradiction:

Improveimaging qualityVSAvoiddesign difficulty

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent establishes specific parameter ranges for novel optical materials including refractive index (1.55≤N3≤1.70 for the third lens), Abbe number (36≤VD3≤60 for the third lens), and focal length ratios. These parameter specifications provide design guidance that simplifies the application of novel materials by defining acceptable ranges, thereby improving imaging quality without excessively increasing design complexity.

Inventive Principle:

Principle #35Parameter changes

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 allows for a compact optical imaging lens assembly that achieves high image quality and a large imaging area, effectively addressing the miniaturization and performance requirements for portable electronic devices.

Implementation Method 1

The first lens may have positive refractive power, and an object-side surface of the first lens may be a convex surface

Methodology Applied