Nine-Element Aspheric Lens Assembly for Miniaturization
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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 desirable field of view, especially with the advancements in semiconductor technology and increasing functionality requirements.
Innovation Solution
The optical photographing lens assembly consists of nine lens elements, with at least one lens element having an aspheric lens surface with an inflection point. This design includes an aperture stop and satisfies specific conditions regarding axial distances, focal lengths, and Abbe numbers to optimize image quality and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical system design is used, then the system structure is simple, but it cannot achieve high image quality while maintaining miniaturization and proper field of view
Solution Approach 1:
The optical system is divided into nine distinct lens elements with specific refractive powers and dispersion characteristics. Each lens element is optimized independently to contribute to overall image quality while maintaining compact dimensions. The segmentation allows complex optical functions to be distributed across multiple elements, achieving high image quality without excessive overall size.
Solution Approach 2:
Different lens elements are assigned specific local properties: positive refractive power elements for convergence, negative refractive power elements for divergence, and elements with different Abbe numbers for chromatic aberration correction. Each lens element has tailored curvature radii, thickness, and material properties to address specific optical requirements at different positions in the optical path, enabling miniaturization while maintaining image quality.
2Manufacturing precision
If the number of lens elements is increased to improve image quality, then image quality improves, but the device complexity and size increase
Solution Approach 1:
The patent optimizes specific parameters of each lens element including curvature radii (R1-R18), thickness (d1-d9), axial distances (T12-T89), refractive indices (N1-N9), and Abbe numbers (V1-V9). By precisely controlling these parameters within defined ranges, the system achieves high image quality with nine elements without excessive complexity. The aspheric coefficients (A4-A20) further refine the optical performance through parameter optimization.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements to replace traditional spherical surfaces. The aspheric profiles, defined by conic coefficients (k1-k18) and aspheric coefficients (A4-A20), enable better control of light rays, reduce spherical aberration, and improve image quality. This curvature optimization allows achieving high performance with a moderate number of elements, balancing complexity and performance.
3Use of energy by moving object
If the aperture size is increased to improve light gathering, then sensitivity improves, but the optical system size and complexity increase
Solution Approach 1:
The patent incorporates an aperture stop at a specific position (axial distance T45 from the fifth lens element) to pre-control the light cone angle and eliminate stray light before it reaches subsequent lens elements. This preliminary control of light paths allows for optimized aperture sizing that maximizes light gathering while preventing unwanted reflections and aberrations, thereby improving sensitivity without proportionally increasing system size.
Solution Approach 2:
The aperture stop acts as an intermediary element that regulates light transmission between the front lens elements and the rear lens elements. By positioning the stop at a specific location and sizing it appropriately, the system optimizes the balance between light gathering capability and control of aberrations, achieving improved sensitivity without requiring a proportionally larger overall aperture or increased system dimensions.
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 proposed solution effectively balances image quality, sensitivity, and field of view while minimizing the size of the optical system, thereby addressing the limitations of conventional systems.
Implementation Method 1
Each of the nine lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side, and at least one lens element of the optical photographing lens assembly has at least one aspheric lens surface having at least one inflection point
Data Source
AI summary
An optical photographing lens assembly includes nine 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, a seventh lens element, an eighth lens element and a ninth lens element. Each of the nine lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. At least one lens element of the optical photographing lens assembly has at least one aspheric lens surface having at least one inflection point.