Compact Image Pickup Lens Aberration Correction
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Solution Overview
Problem
Conventional photographic lens modules in mobile devices with low image sensor resolution require more lens elements to achieve high image performance, which contradicts the need for compactness.
Innovation Solution
A compact image pickup lens design using only three lens elements, with specific refractive powers and shapes, including a meniscus lens and a negative lens with aspheric surfaces, and an aperture placement to correct optical aberrations, ensuring high image performance while maintaining compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens elements is increased to achieve high image performance with high-resolution image sensors, then image quality is improved, but the size and weight of the lens module increase
Solution Approach 1:
The patent applies parameter changes by carefully selecting the refractive powers and Abbe numbers of the three lens elements to satisfy specific mathematical conditions. This allows the lens to correct optical aberrations and achieve high image quality with only three elements, resolving the contradiction between image quality and lens module size.
Solution Approach 2:
The patent uses composite material principles by combining lens elements with different Abbe numbers (v1, v2, v3) and refractive powers in a specific configuration. This composite approach enables effective aberration correction with minimal elements, achieving high image performance without increasing module size.
2Reliability
If the number of lens elements is increased to correct optical aberrations, then image performance is improved, but the weight of the lens module increases
Solution Approach 1:
The patent changes parameters by optimizing the refractive powers and Abbe numbers of the three lens elements to satisfy specific mathematical conditions. This enables effective aberration correction with minimal elements, improving image performance without increasing weight.
Solution Approach 2:
The patent extracts only the essential three lens elements needed to achieve high image performance, eliminating unnecessary additional elements. This extraction approach corrects optical aberrations effectively while minimizing the overall weight of the lens module.
3Measurement precision
If more lens elements are used to achieve high image performance, then optical aberration correction is improved, but the length of the lens module increases
Solution Approach 1:
The patent applies parameter changes by satisfying specific mathematical conditions involving the refractive powers and Abbe numbers of the three lens elements. This enables effective optical aberration correction with a compact three-element design, resolving the contradiction between aberration correction capability and lens module length.
Solution Approach 2:
The patent merges multiple functions into only three lens elements, where each element is designed with specific refractive power and Abbe number to simultaneously correct multiple types of optical aberrations. This merging approach achieves high image performance with minimal elements, reducing the overall lens module length.
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 solution achieves high image quality and compactness by optimizing the lens configuration, allowing for lightweight and cost-effective designs that meet the increasing pixel resolution demands of modern image sensors.
Implementation Method 1
a first lens element of positive refractive power, having a meniscus shape with its convex surface on the object side
Implementation Method 2
a second lens element of positive refractive power, having also a meniscus shape but with its convex surface on the image side
Implementation Method 3
a third lens element of negative refractive power
Implementation Method 4
Each of the first, second and third lens elements has at least one aspheric surface
Data Source
AI summary
A compact image pickup lens includes, in order from an object side to an image side, a first lens element G1 of positive refractive power, a second lens element G2 of positive refractive power, and a third lens element G3 of negative refractive power. The first lens element has a meniscus shape with its convex surface L1 on the object side. The second lens element also has a meniscus shape but with its convex surface L4 on the image side. Each of the first, second and third lens elements has at least one aspheric surface. An aperture STO is further positioned in front of the second lens element. The image pickup lens satisfies the following conditions: 0.85≦(v1/v2)≦1.15 and 0.85≦(v2/v3)≦1.25, where v1 is the Abbe number at the d-line (587.5618 nm) of the first lens element, v2 is the Abbe number at the d-line (587.5618 nm) of the second lens element, and v3 is the Abbe number at the d-line (587.5618 nm) of the third lens element.