Seven-Lens Camera Optics for Compact Wide-Field Aberration Control
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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.
Innovation Solution
An optical photographing system comprising seven lens elements with specific refractive powers and surface curvatures, including convex and concave surfaces, and inflection points, is designed to optimize image quality and field of view while minimizing size, using materials like glass or plastic and incorporating aspheric surfaces and light-folding elements.
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 the system size and complexity increase
Solution Approach 1:
The optical system is divided into seven distinct lens elements with specific positive and negative refractive powers, arranged in a predetermined sequence. This segmentation allows each element to contribute to correcting specific types of aberrations while maintaining overall system performance and enabling precise control over the optical path.
Solution Approach 2:
Different lens elements are assigned specific surface curvatures (convex or concave in paraxial regions) and refractive power signs to address local optical quality issues. For example, the fourth lens element has a concave object-side surface and convex image-side surface, while the sixth element has positive refractive power with convex object-side and concave image-side surfaces, allowing targeted correction of different aberration types throughout the optical path.
2Manufacturing precision
If lens surfaces are made more complex with inflection points to correct aberrations, then image quality improves, but manufacturing difficulty increases
Solution Approach 1:
The patent employs aspheric surfaces with inflection points on various lens elements to correct optical aberrations more effectively than simple spherical surfaces. The object-side surface of at least one lens element has an inflection point, allowing for better control of light rays and improved image quality while maintaining manufacturability through modern molding techniques.
3Manufacturing precision
If the aperture size is increased to improve light gathering, then image quality improves, but sensitivity increases which is undesirable
Solution Approach 1:
The patent carefully controls the aperture size and the distribution of refractive powers among the seven lens elements to achieve optimal image quality while maintaining low sensitivity. The specific configuration of positive and negative refractive power elements allows for balanced light gathering and aberration control, preventing excessive sensitivity while preserving imaging performance.
4Length of moving object
If the system is miniaturized to reduce device size, then compactness improves, but field of view and image quality may deteriorate
Solution Approach 1:
The seven lens elements are arranged in a compact nested configuration along the optical axis, with each element positioned to optimize the optical path length while minimizing the overall system size. This nested arrangement allows the system to achieve miniaturization without sacrificing field of view or image quality, as each lens element contributes efficiently to the overall optical function within a reduced form factor.
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 system achieves a balance between image quality, miniaturization, and field of view, enhancing the performance of electronic devices by correcting aberrations and reducing sensitivity, while allowing for flexible design and cost-effective manufacturing.
Implementation Method 1
The seven lens elements are, in order from an object side to an image side along an optical path... 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... The object-side surface of the fourth lens element is concave in a paraxial region thereof, and the image-side surface of the fourth lens element is convex in a paraxial region thereof
Data Source
AI summary
An optical photographing system 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. 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. The object-side surface of the sixth lens element is convex in a paraxial region thereof. At least one of the object-side surface and the image-side surface of at least one lens element of the optical photographing system has at least one inflection point.