Five-Element Lens Assembly With Inflection-Point Surfaces
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Solution Overview
Problem
Conventional optical lens assemblies struggle to balance image quality, sensitivity, aperture size, and volume or field of view, making it difficult to meet the diverse requirements of modern electronic devices.
Innovation Solution
An image capturing system lens assembly comprising five lens elements, each with specific refractive powers and surface shapes, including inflection points and aspheric surfaces, along with an aperture stop, to optimize optical performance and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical lens assemblies are used, then manufacturing and assembly are simpler, but image quality, sensitivity, aperture size, and field of view cannot be balanced
Solution Approach 1:
The lens assembly is divided into five distinct lens elements with specific refractive powers and surface shapes. Each lens element is designed with particular characteristics (e.g., second lens element with positive refractive power, aspheric surfaces with inflection points) to independently address specific optical requirements, allowing the system to achieve high image quality while managing complexity through functional segmentation
Solution Approach 2:
Different regions of the lens surfaces are designed with varying properties. Aspheric surfaces with inflection points are implemented on specific lens elements (object-side surface of first lens element, image-side surface of second lens element, etc.) to locally optimize light ray control in different zones, improving overall image quality without requiring complete redesign of the entire lens system
2Illumination intensity
If aperture size is increased to improve sensitivity and field of view, then more light is captured, but lens assembly volume increases
Solution Approach 1:
Aspheric surfaces with inflection points are employed on multiple lens elements to optimize the optical path and improve light gathering efficiency. The curved surfaces with varying radius of curvature allow for better control of light rays across different aperture zones, enabling high sensitivity without requiring a proportionally larger aperture opening that would increase overall lens volume
Solution Approach 2:
The patent specifies precise parameter ranges for lens element positions, focal lengths, and surface curvatures (e.g., axial distances T12, T23, T34, T45; focal length f; curvature radii R1-R8) to optimize the optical system's light sensitivity. By carefully adjusting these parameters, the system achieves high illumination intensity capture within a compact volume
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 assembly achieves improved image quality, wide field of view, and reduced manufacturing costs while balancing aperture size and volume, suitable for compact electronic devices.
Implementation Method 1
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 second lens element has positive refractive power.
Implementation Method 2
At least one of the object-side surface and the image-side surface of at least one of the first lens element to the fifth lens element includes at least one inflection point.
Data Source
AI summary
An image capturing system lens assembly includes five lens elements, which are, in order from an object side to an image side along an optical path, 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. At least one of the object-side surface and the image-side surface of at least one of the first lens element to the fifth lens element includes at least one inflection point.