Seven-Lens Optical Assembly with Aspheric Surfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical systems face challenges in achieving a balance between high image quality, low sensitivity, compact size, and a sufficient field of view, making it difficult to meet the increasing functionality requirements of electronic devices.
Innovation Solution
An optical photographing lens assembly comprising seven lens elements, with at least one aspheric surface and specific refractive power distributions, including a first lens element with positive refractive power and a seventh lens element with negative refractive power, arranged to satisfy conditions such as Σ|f/fi| < 2.20 and 0.50 < TL/f < 3.50, to optimize image quality and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical systems are used, then the structure is simple, but the image quality is insufficient and the field of view is limited
Solution Approach 1:
The optical system is divided into seven distinct lens elements with specific refractive power distributions. Each lens element has defined curvature radii and thickness parameters that work together to correct aberrations and improve image quality while maintaining a manageable overall structure
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, including the first lens element with an aspheric object-side surface and the seventh lens element with an aspheric image-side surface having inflection points. These curved surfaces enable better light control and aberration correction compared to conventional spherical surfaces
2Length of moving object
If the optical system is miniaturized, then the size is reduced, but the field of view becomes insufficient
Solution Approach 1:
The patent optimizes specific parameter ratios including Σ|f/fi| < 2.60 for focal length distribution, 0.50 < TL/f < 3.50 for total length to focal length ratio, and R10/f < 1.30 for curvature radius to focal length ratio. These parameter constraints enable miniaturization while preserving adequate field of view through efficient optical design
3Illumination intensity
If the aperture size is increased, then the light gathering ability is improved, but the sensitivity increases
Solution Approach 1:
The patent implements local quality optimization by assigning different refractive powers to different regions of the optical system. The first lens element has positive refractive power for light gathering, while the seventh lens element has negative refractive power with specific curvature characteristics to control sensitivity and reduce aberrations in different field regions
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 enables the optical photographing lens assembly to achieve high image quality, low sensitivity, and compactness while maintaining a balance between image quality and field of view, making it suitable for various applications in electronic devices.
Implementation Method 1
At least one surface among object-side surfaces and image-side surfaces of the seven lens elements is aspheric
Implementation Method 2
At least one of an object-side surface and an image-side surface of the seventh lens element has at least one inflection point
Data Source
AI summary
An optical photographing lens assembly includes seven lens elements which 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, a fifth lens element, a sixth lens element and a seventh lens element. At least one surface among object-side surfaces and image-side surfaces of the seven lens elements is aspheric. At least one of an object-side surface and an image-side surface of the seventh lens element has at least one inflection point.