Five-Lens Camera Optical Lens Design for Compact Long-Focus Imaging

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Solution Overview

Problem

The demand for miniature camera optical lenses with good imaging quality, long focal length, and small distortion is increasing, especially for handheld devices and vehicle-mounted applications, where existing lenses fail to meet the requirements of large aperture and aberration correction effectively.

Innovation Solution

A camera optical lens design comprising five lenses, with specific refractive powers and curvature radii, made from glass and plastic materials, optimized for a wide temperature range, meeting conditions such as 1.50≤TTL/f≤4.00, 1.70≤n1≤2.20, and R3/R4≤−2.00, to achieve excellent optical performance, large aperture, and low distortion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If a long-focus camera optical lens is designed, then the focal length increases, but the total optical length increases

Engineering Contradiction:

Improvefocal lengthVSAvoidtotal optical length

Core Design Contradiction:

Length of moving objectVSLength of stationary object

Solution Approach 1:

The optical system is divided into five separate lens elements with specific refractive powers arranged in sequence. This segmentation allows each lens to contribute differently to the overall optical path, enabling long focal length while controlling total optical length through optimized individual lens parameters and spacing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies specific parameter constraints including TTL/f ratio between 1.50-4.00, refractive index n1 between 1.70-2.20, and curvature radius ratio R3/R4≤-2.00. These parameter changes optimize the relationship between focal length and total optical length, achieving compact design while maintaining long-focus capability.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If multiple lenses are used to improve imaging quality, then the imaging performance improves, but the device complexity increases

Engineering Contradiction:

Improveimaging qualityVSAvoidlens structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system uses five lens elements with alternating positive and negative refractive powers to correct various aberrations. Each lens element is designed with specific functions, and the segmented structure allows comprehensive aberration correction while maintaining manageable complexity through systematic design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent specifies that the first lens is made of glass material with refractive index n1 between 1.70-2.20, and at least one of the other lenses is also made of glass material. This material selection optimizes optical performance while controlling manufacturing complexity through standardized material specifications.

Inventive Principle:

Principle #40Composite materials

3Illumination intensity

If the aperture is enlarged to improve light gathering, then the aperture size increases, but the aberration correction becomes more difficult

Engineering Contradiction:

Improveaperture sizeVSAvoidaberration correction

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The five-lens configuration with alternating positive and negative refractive powers enables effective aberration correction across large aperture. The segmentation allows different lens elements to address specific aberration types, maintaining optical quality even with enlarged aperture for improved light gathering.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies specific parameter constraints including the curvature radius ratio R3/R4≤-2.00 and refractive index requirements, which are optimized to correct aberrations while maintaining large aperture. These parameter changes ensure that aberration correction remains effective despite the increased aperture size.

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 large aperture, long focal length, and small distortion, making it suitable for high-pixel CCD, CMOS, and WEB camera applications, with on-axis and off-axis chromatic aberrations fully corrected, ensuring high-quality imaging across varying temperatures.