Eight-element Camera Lens Design for Wide-Angle Aberration Correction

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Solution Overview

Problem

There is a need for a wide-angle imaging lens with excellent optical characteristics, small size, and fully corrected aberrations for handheld terminal devices and imaging devices, as the pixel size of photosensitive devices shrinks and image quality requirements increase, necessitating a multi-piece lens structure with improved optical performance.

Innovation Solution

A camera optical lens comprising eight lenses, with specific refractive powers and curvature radii, arranged to satisfy conditions such as 0.85≤f1/f≤1.10, 1.00≤d6/d8≤3.00, and 3.00≤(R11+R12)/(R11−R12)≤20.00, to achieve ultra-thin and wide-angle performance with a large aperture, effectively correcting aberrations and maintaining image quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a multi-piece lens structure is used to improve image quality, then optical performance is improved, but device complexity increases

Engineering Contradiction:

Improveoptical performanceVSAvoidlens structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The optical lens is divided into eight individual lens elements (first lens through eighth lens) with specific refractive powers arranged in sequence from object side to image side. This segmentation allows each lens element to contribute to correcting specific aberrations and achieving the desired optical performance, while the modular structure enables independent optimization of each element's parameters.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If the pixel size of photosensitive devices shrinks to increase resolution, then image quality is improved, but the lens system becomes more difficult to design

Engineering Contradiction:

Improveimage resolutionVSAvoidlens design complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Each lens element is assigned specific local optical properties including particular refractive powers (positive or negative), curvature radius relationships, and thickness ratios. For example, the sixth lens has specific constraints on its object side surface curvature radius R11 and image side surface curvature radius R12, where 3.00≤(R11+R12)/(R11−R12)≤20.00, ensuring optimal local correction of aberrations for high-resolution imaging.

Inventive Principle:

Principle #3Local quality

3Reliability

If an eight-element lens structure is used to correct aberrations, then optical characteristics are improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improveaberration correctionVSAvoidlens fabrication precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent establishes specific parameter ranges and relationships for each lens element to guide manufacturing. Key parameters include focal length ratios (0.85≤f1/f≤1.10), distance ratios (1.00≤d6/d8≤3.00), curvature radius relationships (3.00≤(R11+R12)/(R11−R12)≤20.00), and thickness ratios (d15 max/d15 min≤2.20). These quantified constraints provide clear manufacturing targets while ensuring aberration correction performance.

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

The lens design achieves excellent optical performance with a large aperture, ultra-thin profile, and wide-angle capabilities, effectively correcting aberrations and meeting the design requirements for high pixel CCD and CMOS camera lenses, suitable for mobile and web camera applications.