Four-Element Image Lens Assembly for Mobile Terminals
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Solution Overview
Problem
Conventional compact optical systems in mobile terminals fail to meet the requirements of high resolution and image quality due to uneven thicknesses of lens elements and photosensitivity issues, leading to compromised image quality and size constraints.
Innovation Solution
A compact image lens assembly comprising four non-cemented lens elements with specific refractive powers and surface curvatures, including a first convex, second concave, third concave-convex, and fourth concave with an inflection point, optimized to satisfy conditions such as 0.50<CT3/CT2<1.12 and 0<f4/f2<0.90, enhancing image quality and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional three-element lens structure is used, then the device complexity is reduced, but the image quality and resolution requirements cannot be satisfied
Solution Approach 1:
The lens system is divided into four separate lens elements (first lens element, second lens element, third lens element, and fourth lens element) with different refractive powers and surface curvatures. Each lens element is optimized independently to correct specific optical aberrations, allowing the system to achieve high image quality while maintaining manageable complexity through modular design
Solution Approach 2:
Different regions of the lens assembly are assigned different optical properties. The first lens element has positive refractive power with convex object-side surface, the second has negative refractive power with concave surfaces, the third has positive refractive power with concave-convex surfaces, and the fourth has negative refractive power with concave surfaces. This local optimization of optical characteristics enables precise control over the overall optical performance
2Reliability
If the thicknesses of the second and third lens elements are not even, then the manufacturing is simplified, but the photosensitivity increases and compactness is compromised
Solution Approach 1:
The central thickness of the second lens element (CT2) and third lens element (CT3) are specifically designed to satisfy the condition 0.50 < CT3/CT2 < 1.12, making their thicknesses substantially equal. This parameter optimization reduces photosensitivity by improving light distribution uniformity across the sensor while maintaining ease of manufacture through standardized thickness specifications
3Manufacturing precision
If a conventional four-element lens structure with uneven thickness is used, then the device complexity is increased, but the compactness and image quality deteriorate
Solution Approach 1:
The lens elements are arranged in a compact axial configuration where the fourth lens element is positioned adjacent to the third lens element with their optical axes aligned. This dimensional arrangement allows the system to achieve high image quality through optimized optical paths while minimizing the overall length of the lens assembly, satisfying the requirement for compact electronic products
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 provides improved image quality, reduced photosensitivity, and a compact size by optimizing the refractive powers and curvatures of the lens elements, addressing the limitations of conventional systems.
Implementation Method 1
a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, and a fourth lens element with negative refractive power
Data Source
AI summary
An image lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element with positive refractive power has a convex object-side surface in a paraxial region thereof. The second lens element with negative refractive power has a concave object-side surface in a paraxial region thereof and a concave image-side surface in a paraxial region thereof. The third lens element with positive refractive power has a concave object-side surface in a paraxial region thereof and a convex image-side surface in a paraxial region thereof. The fourth lens element with negative refractive power has a concave image-side surface in a paraxial region thereof. The image lens assembly has a total of four lens elements with refractive power.