Six-Element Imaging Lens Assembly for Wide Field and Low Aberration
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Solution Overview
Problem
Conventional optical lens assemblies struggle to balance image quality, sensitivity, aperture size, volume, and field of view, making it difficult to meet the diverse requirements of modern electronics with enhanced image sensors.
Innovation Solution
An imaging optical system lens assembly comprising six lens elements, each with specific refractive powers and surface shapes, including concave and convex surfaces, inflection points, and optimized focal lengths and thickness ratios, to enhance field of view, image size, and reduce aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to improve image quality, then image quality is improved, but device volume and complexity increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers, focal lengths, and thickness ratios of the six lens elements. Specific mathematical relationships are established (e.g., -0.30 < f6/f < -0.05, 4.50 < (CT3+CT5)/CT4 < 6.08) to optimize the optical system. This allows achieving high image quality with a compact six-element design rather than using more elements, thus resolving the contradiction between image quality and device volume.
2Use of energy by moving object
If the aperture size is increased to improve sensitivity, then sensitivity is improved, but aberrations increase
Solution Approach 1:
The patent applies local quality by giving each lens element specific local characteristics: the first element has negative refractive power with concave object-side surface, the second has positive refractive power, the fourth has negative refractive power, and the sixth has negative refractive power. Each element's surface shapes (convex/concave in paraxial regions) are locally optimized to control aberrations while maintaining overall sensitivity, allowing large aperture operation with controlled aberrations.
3Area of stationary object
If the field of view is widened to improve coverage, then field of view is widened, but aberrations and image quality deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the optical system into six distinct lens elements, each responsible for specific aberration correction functions. The first element (negative power) handles field curvature, the second (positive power) corrects spherical aberration, the fourth (negative power) and sixth (negative power) elements further refine off-axis performance. This segmented approach enables wide field of view while maintaining image quality across the entire field.
4Volume of stationary object
If the lens element thickness is reduced to compact the device, then device volume is reduced, but manufacturing precision and aberration control become more difficult
Solution Approach 1:
The patent applies composite materials by selecting lens elements with different refractive indices and Abbe numbers. Specific material combinations are used: the first element has refractive index 1.50-1.70, the second has 1.60-1.80, the fourth has 1.50-1.70, and the sixth has 1.45-1.65. This composite material strategy allows compact thickness while maintaining aberration control through material properties rather than relying solely on geometric parameters.
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, wider field of view, and compact size by balancing refractive powers and reducing spherical aberrations, while allowing for flexible material choices like glass or plastic and aspheric surfaces for manufacturing advantages.
Implementation Method 1
Each of the six lens elements has an object-side surface towards the object side and an image-side surface towards the image side. The first lens element has negative refractive power, the second lens element has positive refractive power, the fifth lens element has positive refractive power.
Data Source
AI summary
An imaging optical system lens assembly includes six lens elements, which is, 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, a fifth lens element and a sixth lens element. The first lens element has negative refractive power, the object-side surface of the first lens element is concave in a paraxial region thereof, the image-side surface of the first lens element is convex in a paraxial region thereof. The second lens element has positive refractive power, the object-side surface of the second lens element is convex in a paraxial region thereof, the image-side surface of the second lens element is concave in a paraxial region thereof. The fifth lens element has positive refractive power.