Five-Lens Camera Optical Lens Design for Miniaturization

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Solution Overview

Problem

There is a need for ultra-thin wide-angle camera lenses with good optical characteristics and fully corrected chromatic aberration, particularly for handheld devices like smartphones and digital cameras, where the pixel area of photosensitive devices is shrinking and imaging quality requirements are increasing.

Innovation Solution

A five-piece camera optical lens design is proposed, comprising specific refractive power configurations and materials for each lens, including a glass and plastic combination, with aspherical surfaces and optimized thickness and curvature radii to minimize total optical length and correct aberrations, ensuring high imaging quality and miniaturization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a three-piece or four-piece lens structure is used, then the lens can be manufactured with simpler processes, but the imaging quality and chromatic aberration correction are insufficient for high-pixel photosensitive devices

Engineering Contradiction:

Improveimaging qualityVSAvoidlens structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The lens system is divided into five separate lens elements with specific refractive power configurations (first lens: positive, second lens: negative, third lens: negative, fourth lens: positive, fifth lens: negative). This segmentation allows each element to contribute to correcting specific aberrations, achieving superior imaging quality and chromatic aberration correction that cannot be attained with fewer elements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs composite material design by combining glass and plastic lens elements. Specifically, the second lens uses glass material while other lenses use plastic materials. This composite approach enables optimization of each element's optical properties to correct chromatic aberration and improve overall imaging performance.

Inventive Principle:

Principle #40Composite materials

2Manufacturing precision

If the number of lens pieces is increased to five, six, or seven, then the chromatic aberration correction and imaging quality improve, but the total optical length increases and miniaturization becomes difficult

Engineering Contradiction:

Improvechromatic aberration correctionVSAvoidtotal optical length

Core Design Contradiction:

Manufacturing precisionVSLength of stationary object

Solution Approach 1:

The patent optimizes specific parameter relationships to achieve compact design. Key parameter constraints include: 0.75 < (R3+R6)/(R3-R6) < 1.25, where R3 is the curvature radius of the object-side surface of the second lens and R6 is the curvature radius of the image-side surface of the third lens. Additionally, the ratio of the focal length of the first lens to the total focal length is controlled between 0.3 and 0.7. These parameter optimizations enable effective chromatic aberration correction while maintaining a compact total optical length suitable for miniaturized devices.

Inventive Principle:

Principle #35Parameter changes

3Volume of moving object

If the pixel area of photosensitive devices is shrunk to achieve miniaturization, then the device size is reduced, but the imaging quality requirements become more stringent

Engineering Contradiction:

Improvedevice sizeVSAvoidimaging quality

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The patent incorporates aspherical surfaces on multiple lens elements to correct optical aberrations more effectively. The aspherical design allows for better control of light rays, improving imaging quality and reducing aberrations such as spherical aberration and coma. This enables the lens system to maintain high imaging performance in a compact form factor suitable for miniaturized high-pixel devices.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 design achieves high-performance imaging with reduced system length, improved optical performance, and effective correction of chromatic aberration, making it suitable for high-pixel portable cameras and low-illumination environments.

Implementation Method 1

the first lens L1 has a positive refractive power with a convex object side surface relative to the proximal axis

Methodology Applied