Seven-Element Photographing Lens Assembly for Compact Wide-Field Imaging
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Solution Overview
Problem
Conventional optical systems face challenges in achieving a balance among high image quality, low sensitivity, proper aperture size, miniaturization, and a desirable field of view, particularly with the advancement of semiconductor technology and increasing functionality requirements in electronic devices.
Innovation Solution
A photographing lens assembly comprising seven lens elements with specific refractive powers and surface configurations, including aspheric surfaces, is designed to optimize optical performance by balancing field of view, image quality, and size, with conditions such as 1.8 < TL/f < 4.2 and 0.00 < 100 × |R11/R9| < 23.5, ensuring effective aberration correction and efficient light convergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to improve image quality, then aberration correction is enhanced, but device complexity and size increase
Solution Approach 1:
The lens assembly is divided into seven distinct lens elements with specific refractive power assignments (first and fourth elements with negative power, second, third, and sixth with positive power). Each element is optimized for specific aberration correction functions, allowing complex optical performance to be achieved through modular segmentation rather than a single complex element.
Solution Approach 2:
The lens elements are designed to perform multiple functions simultaneously. For example, the aspheric surfaces on various elements correct spherical aberration, coma, and distortion while also controlling field curvature. The sixth lens element with positive refractive power and convex surfaces contributes to both image convergence and aberration correction, reducing the need for additional dedicated correction elements.
2Adaptability or versatility
If the field of view is widened to enhance functionality, then the application range is expanded, but optical aberrations increase
Solution Approach 1:
Aspheric surfaces are implemented on multiple lens elements including the first, second, third, fourth, fifth, and sixth elements. These asymmetric surfaces deviate from traditional spherical geometry to precisely control light ray paths across the wide field of view, correcting off-axis aberrations such as coma and distortion that typically plague wide-angle designs.
Solution Approach 2:
Different regions of the lens elements are optimized for different functions. The aspheric surfaces provide localized correction in specific zones to address field curvature and distortion in the peripheral regions while maintaining sharp central imaging. The varying refractive powers across elements create localized optical corrections tailored to specific field regions.
3Volume of moving object
If the lens assembly is miniaturized to reduce device size, then integration is improved, but aperture size and light gathering capability are reduced
Solution Approach 1:
The lens elements utilize aspheric surfaces that add dimensional complexity to the optical paths, allowing light to be efficiently converged and redirected through a compact arrangement. The non-spherical geometry enables more effective use of available space, achieving adequate aperture functionality within a reduced overall assembly volume compared to traditional spherical lens designs.
Solution Approach 2:
The lens elements employ varying refractive powers and surface curvatures to optimize light convergence efficiency. The positive refractive power elements (second, third, sixth) are designed with specific curvature parameters to maximize light gathering capability within compact dimensions, while the negative power elements (first, fourth) are optimized for their specific thickness and curvature parameters to maintain aperture functionality in a miniaturized configuration.
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 achieves a wide field of view up to 180 degrees, high image quality with controlled distortion, and compact size, while maintaining low sensitivity and appropriate aperture size, suitable for modern electronic devices.
Implementation Method 1
a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element... Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side
Data Source
AI summary
A photographing lens assembly includes seven 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, a fifth lens element, a sixth lens element and a seventh lens element. The first lens element has negative refractive power. The second lens element has an image-side surface being concave in a paraxial region thereof. The third lens element has an image-side surface being convex in a paraxial region thereof. The fourth lens element has negative refractive power. The sixth lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The seventh lens element has an image-side surface having at least one inflection point.