Four-Element Optical Lens Assembly with Inflection Points
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Solution Overview
Problem
Conventional optical systems face challenges in achieving a balance between high image quality, low sensitivity, proper aperture size, miniaturization, and a desirable field of view, making it difficult to meet the increasing functionality requirements of electronic devices with advanced image sensors.
Innovation Solution
An optical lens assembly comprising four lens elements with specific refractive powers, surface curvatures, and inflection points, optimized by conditions such as Abbe numbers, central thickness ratios, and focal lengths to achieve compactness, reduced sensitivity, and improved peripheral image quality, while maintaining high image quality and field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical system is miniaturized to reduce device size, then the compactness is improved, but the image quality deteriorates due to increased sensitivity and reduced aperture size
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and Abbe numbers of lens elements, adjusting surface curvatures and thickness ratios, and controlling the focal length to total track length ratio. These parameter optimizations enable the optical system to achieve high image quality despite miniaturization, resolving the contradiction between compactness and image quality
Solution Approach 2:
The patent uses composite material principles by combining lens elements with different refractive indices and Abbe numbers (including plastic and glass materials). This composite approach allows the system to balance chromatic aberration correction with compact design, maintaining image quality while reducing overall system size
2Reliability
If the aperture size is reduced to lower sensitivity, then the sensitivity is improved, but the light gathering ability deteriorates
Solution Approach 1:
The patent optimizes the f-number (focal length divided by entrance pupil diameter) to balance sensitivity control and light gathering ability. By carefully selecting this parameter along with lens element configurations, the system achieves desired sensitivity levels while maintaining adequate light transmission for high-quality imaging
3Adaptability or versatility
If the field of view is enlarged to increase functionality, then the versatility is improved, but the image quality deteriorates due to increased distortion and aberration
Solution Approach 1:
The patent applies local quality by giving different surface curvature characteristics to different regions of the lens elements. The object-side and image-side surfaces have specifically designed curvatures that vary across the aperture, enabling wide field of view coverage while correcting off-axis aberrations and maintaining high image quality across the entire field
Solution Approach 2:
The patent optimizes multiple parameters including surface curvature radii, thickness ratios, and the ratio of focal length to total track length. These parameter adjustments enable the system to achieve wide field of view while controlling distortion and aberration to maintain high image quality
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 optical lens assembly effectively balances image quality, sensitivity, and miniaturization, enhancing the performance of electronic devices with advanced image sensors by optimizing lens element configurations and materials, such as plastic or glass, to meet the demands of multi-functional applications.
Implementation Method 1
The first lens element has positive refractive power. The second lens element has an image-side surface being concave in a paraxial region thereof. The third lens element has an object-side surface being concave in a paraxial region thereof. The fourth lens element with negative refractive power...
Data Source
AI summary
An optical lens assembly includes four lens elements which are, in order from an object side to an image side along an imaging optical path: a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element has positive refractive power. The second lens element has an image-side surface being concave in a paraxial region thereof. The third lens element has an object-side surface being concave in a paraxial region thereof. The fourth lens element with negative refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, and at least one of the object-side surface and the image-side surface of the fourth lens element has at least one inflection point in an off-axis region thereof.