Five-Element Optical Lens Assembly for Compact Imaging
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Solution Overview
Problem
Conventional optical lens assemblies face challenges in balancing image quality, sensitivity, aperture size, volume, and field of view, making it difficult to achieve high imaging quality while maintaining a compact size suitable for electronic devices.
Innovation Solution
The optical lens assembly comprises five lens elements, with specific surface curvatures and refractive powers, including a first lens element with positive refractive power, a fourth lens element with positive refractive power and a convex object-side surface, and a fifth lens element with negative refractive power and concave object- and image-side surfaces. These elements are arranged to satisfy specific conditions regarding axial distances, curvature radii, and central thicknesses, optimizing the lens assembly's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional optical lens assembly is used, then the structure is simple, but the imaging quality cannot be balanced with aperture size and volume
Solution Approach 1:
The optical lens assembly is divided into five separate lens elements (first lens element, second lens element, third lens element, fourth lens element, and fifth lens element) with different refractive powers and surface curvatures. Each lens element is optimized for specific optical functions, allowing independent design and optimization of imaging quality while controlling overall complexity through modular segmentation.
Solution Approach 2:
Different regions of the lens assembly have different optical properties. The first lens element has positive refractive power with specific surface curvatures, the fourth lens element has positive refractive power with a convex object-side surface, and the fifth lens element has negative refractive power with concave surfaces. This local optimization of optical properties enables high imaging quality while maintaining a compact structure.
2Reliability
If the aperture size is increased, then the sensitivity is improved, but the volume of the lens assembly increases
Solution Approach 1:
The lens assembly utilizes multi-dimensional arrangement of the five lens elements with specific axial distances between them. By optimizing the spatial distribution in multiple dimensions rather than simply increasing aperture diameter, the system achieves high sensitivity while maintaining a compact volume suitable for electronic devices.
Solution Approach 2:
The patent optimizes multiple parameters including axial distances between lens elements (T12, T23, T34, T45), curvature radii (R1, R7, R9), central thicknesses (CT1-CT5), and refractive powers to achieve the desired balance between sensitivity and volume. The specific parameter relationships (e.g., 0.6 ≤ ΣCT/ΣAT ≤ 1.5) are carefully controlled to maintain compact size while ensuring high imaging quality.
3Area of stationary object
If the field of view is widened, then the imaging coverage is improved, but the imaging quality deteriorates
Solution Approach 1:
The lens assembly segments the optical path into five distinct lens elements, each contributing to different aspects of image formation. This segmentation allows the system to achieve a wide field of view while maintaining imaging quality through the coordinated optical functions of individual lens elements, particularly the fourth and fifth elements with their specific surface curvatures that control aberrations.
Solution Approach 2:
The lens assembly employs asymmetric surface curvatures and configurations. The fourth lens element has a convex object-side surface while the fifth lens element has concave object- and image-side surfaces. This asymmetric design enables effective correction of optical aberrations across a wide field of view, maintaining high imaging quality from center to edge of the image sensor.
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 achieves a high standard of imaging quality while maintaining a compact size, effectively balancing the trade-offs between image quality, sensitivity, and volume, making it suitable for electronic devices.
Implementation Method 1
an optical lens assembly includes five lens elements... a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element... Each of the five lens elements has an object-side surface towards the object side and an image-side surface towards the image side
Data Source
AI summary
An optical lens assembly includes five lens elements, the five lens elements are, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. Each of the five lens elements has an object-side surface towards the object side and an image-side surface towards the image side. The fourth lens element with positive refractive power has the object-side surface being convex in a paraxial region thereof. The fifth lens element with negative refractive power has the object-side surface being concave in a paraxial region thereof and the image-side surface being concave in a paraxial region thereof.