Five-Lens Optical Imaging System for Wide-Angle Compact Design

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Solution Overview

Problem

The market demand for portable electronic devices requires an optical imaging system that balances wide-angle, large aperture, high imaging quality, and miniaturization, which existing systems struggle to achieve simultaneously.

Innovation Solution

An optical imaging system comprising five lenses with specific refractive powers, surface shapes, and spacings, including a first lens with negative refractive power and concave surfaces, and a fifth lens with a concave object-side and convex image-side surface, optimized to achieve a wide-angle and large aperture while maintaining high image quality and compact size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the optical imaging system uses more lenses to improve imaging quality and wide-angle performance, then the imaging quality and field of view are improved, but the system size and complexity increase

Engineering Contradiction:

Improveimaging qualityVSAvoidsystem complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The optical imaging system is divided into five distinct lens elements with specific refractive power distributions (−+−+−, −+−++, −+−−+ or −+−−−). Each lens element has specific surface curvature requirements (at least one aspheric surface) and thickness constraints. This segmentation allows complex optical functions to be distributed across multiple simpler components, improving imaging quality while maintaining manageable system complexity through standardized design parameters.

Inventive Principle:

Principle #1Segmentation

2Illumination intensity

If the optical imaging system increases aperture size to improve light gathering ability, then the aperture is enlarged, but the system size increases

Engineering Contradiction:

ImproveapertureVSAvoidsystem size

Core Design Contradiction:

Illumination intensityVSVolume of moving object

Solution Approach 1:

The patent specifies precise parameter ranges including aperture value Fno (0.95-1.8), effective focal length f (0.8-1.5mm), and field of view (50-90 degrees). The lens elements have controlled thickness ratios (edge thickness to center thickness between 0.5-2.0) and specific radius of curvature relationships. These parameter optimizations enable large aperture performance within compact dimensions suitable for portable devices.

Inventive Principle:

Principle #35Parameter changes

3Volume of moving object

If the optical imaging system reduces the size of lens elements to achieve miniaturization, then the system becomes more compact, but the imaging quality may deteriorate

Engineering Contradiction:

Improvesystem sizeVSAvoidimaging quality

Core Design Contradiction:

Volume of moving objectVSMeasurement precision

Solution Approach 1:

The patent requires that each lens element has at least one aspheric surface with specific curvature radius relationships. The object-side and image-side surfaces of each lens have controlled radius of curvature ratios (e.g., |R1/R2| between 0.5-2.0 for the first lens). This curvature optimization enables compact lens element sizes while maintaining adequate optical performance through precise surface geometry control.

Inventive Principle:

Principle #14Spheroidality (Curvature)

4Adaptability or versatility

If the optical imaging system increases field of view to achieve wide-angle performance, then the field of view is enlarged, but the distortion and aberration control becomes more difficult

Engineering Contradiction:

Improvefield of viewVSAvoidaberration control

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent specifies different refractive index ranges for different lens elements (first lens: 1.5-1.7, second lens: 1.4-1.6, third lens: 1.5-1.7, fourth lens: 1.4-1.6, fifth lens: 1.5-1.7) with corresponding Abbe number constraints (30-50). This composite material approach with varied optical properties across lens elements enables wide-field performance while controlling chromatic and spherical aberrations through material diversity.

Inventive Principle:

Principle #40Composite materials

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 effectively enhances imaging quality, achieves a wide-angle view, and ensures compactness, making it suitable for portable electronic devices by rationally matching lens materials and assigning refractive power, surface shapes, and spacings between lenses.

Implementation Method 1

a first lens having a negative refractive power, an object-side surface thereof may be a concave surface, and an image-side surface thereof may be a concave surface

Methodology Applied