Five-Element Imaging Lens with Aspherical Surfaces for Chromatic Aberration Correction

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Solution Overview

Problem

Current imaging lenses face challenges in achieving high image formation performance across the entire angle of view, particularly in reducing total length while correcting longitudinal and lateral chromatic aberrations, and maintaining a small F-number.

Innovation Solution

The design of an imaging lens comprising five lenses with specific optical configurations, including aspherical surfaces, optimized focal lengths, and Abbe numbers, along with a stop arrangement to reduce the angle of incidence of rays, achieving a compact structure with excellent optical performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the total length of the imaging lens is reduced, then the imaging lens becomes more compact and suitable for mobile devices, but the correction of longitudinal and lateral chromatic aberrations becomes more difficult

Engineering Contradiction:

Improvetotal lengthVSAvoidchromatic aberration correction

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The imaging lens is divided into five separate lens elements with different refractive powers and aberration correction characteristics. Each lens element is optimized to correct specific types of aberrations, allowing the system to achieve comprehensive aberration correction within a compact total length.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the imaging lens are assigned different optical characteristics. The first lens element has positive refractive power for overall focusing, while subsequent elements have negative refractive powers specifically optimized for correcting chromatic aberrations in peripheral regions, creating local optimization throughout the lens system.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If the F-number is made smaller, then the light-gathering capability increases and resolution improves, but the total length of the imaging lens increases

Engineering Contradiction:

ImproveresolutionVSAvoidtotal length

Core Design Contradiction:

Measurement precisionVSLength of moving object

Solution Approach 1:

The imaging lens employs a dynamic configuration where the fifth lens element can move along the optical axis to adjust the focal plane. This dynamic adjustment allows the system to maintain optimal focus and aberration correction while keeping the overall lens length compact, enabling small F-number performance without proportional length increase.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The lens system utilizes changes in the positions of individual lens elements, particularly the fifth lens element, to optimize the F-number and focal length relationships. By adjusting these parameters dynamically, the system achieves high resolution with a compact total length that does not scale linearly with F-number reduction.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If the number of lens elements is increased, then the correction of chromatic aberration improves, but the device complexity increases

Engineering Contradiction:

Improveaberration correctionVSAvoidlens structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each lens element in the five-element configuration performs multiple functions: the first lens provides overall focusing, while subsequent lenses simultaneously correct different types of aberrations (longitudinal and lateral chromatic aberration). This multi-functionality reduces the need for additional specialized elements, managing complexity while achieving comprehensive correction.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This configuration allows for a small F-number while maintaining high image formation performance from the center to the peripheral portion of the angle of view, effectively correcting longitudinal and lateral chromatic aberrations, and achieving high resolution imaging.

Implementation Method 1

a first lens having positive power and a meniscus shape with its convex surface facing an object side, and at least one of the surfaces of which is an aspherical surface

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS8885269B2Imaging lens and imaging apparatus including the imaging lens

Publication Date: 2014.11.11 JIANGXI JINGCHAO OPTICAL CO LTD

AI summary

An imaging lens substantially consists of five lenses of a first lens having positive-power and a meniscus shape with its convex surface facing an object side, and at least one of the surfaces of which is aspherical, a second lens having negative-power and a concave surface facing an image side, and at least one of the surfaces of which is aspherical, a third lens having negative-power and a convex surface facing the object side, and at least one of the surfaces of which is aspherical, a fourth lens having positive-power and a convex surface facing the object side, and at least one of the surfaces of which is aspherical, and a fifth lens having negative-power and a concave surface facing the image side, and at least one of the surfaces of which is aspherical, which are in this order from the object side. A predetermined formula is satisfied.