Six-Lens Optical Assembly for Compact High-Resolution Imaging
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Solution Overview
Problem
Current optical lens assemblies with five lenses fail to meet the requirements of miniaturization and high resolution needed for digital still cameras and mobile phones, which demand a new structure for improved performance.
Innovation Solution
The optical lens assembly consists of a sequence of five lenses with specific refractive powers and surface curvatures, including a first lens with positive refractive power and a convex surface facing the object side, a second lens with negative refractive power and a convex surface facing the object side, a third lens with positive refractive power and a concave surface facing the object side, a fourth lens with positive refractive power, a fifth lens with positive refractive power, and a sixth lens with positive refractive power, optimized to achieve a shortened total lens length and increased field of view while maintaining good optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a five-lens optical lens assembly is used, then the structure is simpler, but the resolution and field of view requirements cannot be met
Solution Approach 1:
The patent divides the optical system into six distinct lens elements (first lens through sixth lens), each with specific refractive powers and surface curvatures. This segmentation allows each lens to contribute specific optical functions, achieving high resolution and wide field of view while maintaining a compact structure suitable for mobile devices
Solution Approach 2:
The patent optimizes multiple parameters including the ratio f4/f (10≤f4/f≤25), focal length to total lens length ratio (0.69≤f/TTL≤0.85), and field of view (75.2°≤field of view ≤85°). By carefully adjusting these parameters across the six-lens configuration, the system achieves both high resolution and compact size
2Length of moving object
If the total lens length is shortened, then the device is more compact, but the field of view may be reduced
Solution Approach 1:
The patent achieves a wide field of view (75.2°-85°) within a compact total lens length by optimizing the spatial arrangement of six lenses along the optical axis. The specific curvature values and refractive powers are designed to maximize light gathering angle while maintaining compact axial length, effectively utilizing optical dimensionality
3Manufacturing precision
If more lenses are added to improve resolution, then the optical performance improves, but the device becomes more complex
Solution Approach 1:
Each of the six lenses is designed with specific local optical properties - different refractive powers, different surface curvatures (convex/concave combinations), and optimized positions along the optical axis. This localized optimization allows the system to achieve high resolution without requiring excessive numbers of lenses, as each element contributes specifically tailored optical correction
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
This configuration results in a lens assembly with improved optical performance, including corrected aberrations and increased resolution, while meeting the requirements of miniaturization and high resolution, as demonstrated by various embodiments with specific optical specifications and performance metrics.
Implementation Method 1
The first lens is with positive refractive power and includes a convex surface facing the object side. The second lens is with refractive power. The third lens is with refractive power and includes a concave surface facing the object side.
Data Source
AI summary
An optical lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with positive refractive power and includes a convex surface facing the object side. The second lens is with refractive power. The third lens is with refractive power and includes a concave surface facing the object side. The fourth lens is with positive refractive power. The fifth lens is with positive refractive power. The sixth lens is with positive refractive power. The optical lens assembly satisfies 10≤f4/f≤25, wherein f4 is an effective focal length of the fourth lens and f is an effective focal length of the optical lens assembly.