Five-Lens Camera Optical System for Large Aperture and Ultra-Thinness

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Solution Overview

Problem

Current camera lenses for handheld devices and imaging devices face challenges in achieving a large aperture, ultra-thinness, and wide angle while maintaining good optical functions, particularly due to the reduction in pixel size of photosensitive devices and the need for improved imaging quality.

Innovation Solution

A camera optical lens design comprising five lenses with specific refractive power configurations and curvature radius ratios, including a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power, optimized by various curvature radius and focal length conditions to achieve a balance of optical performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a five-piece lens structure is used to improve imaging quality, then optical functions are improved, but the lens cannot satisfy large aperture, ultra-thinness, and wide angle requirements

Engineering Contradiction:

Improveoptical functionsVSAvoidlarge aperture, ultra-thinness, and wide angle

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies parameter changes by optimizing the curvature radii of lens surfaces and the spacing between lenses. Specifically, it sets the ratio of the curvature radius of the object-side surface to the image-side surface of the second lens within 0.5 ≤ R3/R4 ≤ 2.0, and the ratio of the curvature radius of the object-side surface to the image-side surface of the fifth lens within 0.8 ≤ R9/R10 ≤ 1.2. These parameter optimizations enable the five-piece lens to achieve both good optical functions and the required physical characteristics of large aperture, ultra-thinness, and wide angle.

Inventive Principle:

Principle #35Parameter changes

2Volume of moving object

If pixel size of photosensitive devices is reduced to achieve better functions and smaller dimensions, then device size is reduced, but imaging quality requirements increase

Engineering Contradiction:

Improvedevice sizeVSAvoidimaging quality

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent divides the optical system into five separate lens elements with alternating positive and negative refractive powers. This segmentation allows each lens to be optimized for specific optical functions, correcting various aberrations that become more significant with smaller pixel sizes. The five-piece structure includes lenses with different materials and curvatures, enabling comprehensive aberration correction while maintaining a compact form factor suitable for small pixel devices.

Inventive Principle:

Principle #1Segmentation

3Volume of moving object

If a three-piece or four-piece lens structure is used, then device is miniaturized, but imaging quality is insufficient for high-pixel photosensitive devices

Engineering Contradiction:

Improvelens sizeVSAvoidimaging quality

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs composite material principles by using lenses made from different optical materials with varying refractive indices and Abbe numbers. This allows for chromatic aberration correction and optimization of light transmission across different wavelengths, achieving superior imaging quality in a compact five-piece configuration that would be impossible with uniform materials.

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 lens configuration effectively addresses the need for a large aperture, ultra-thinness, and wide angle, providing excellent optical imaging functions suitable for high-pixel CCD and CMOS camera elements, especially in mobile phone and WEB camera applications.