Five-Lens Optical Assembly for Miniaturization and Aberration Control
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Solution Overview
Problem
Current lens assemblies for digital still cameras and mobile phones are too large and fail to meet the demands for miniaturization and high resolution, necessitating a new structural design.
Innovation Solution
A lens assembly comprising a specific arrangement of lenses with varying refractive powers and a prism, optimized for a shortened total lens length and improved optical performance, including a first biconvex lens, a second biconcave lens, a third biconvex lens, a fourth biconcave lens, and a fifth biconvex lens, along with an optical filter and a stop, arranged along an optical axis to achieve miniaturization and high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional lens assembly structures are used, then optical performance can be maintained, but the total lens length becomes too large to satisfy miniaturization requirements
Solution Approach 1:
The lens assembly is divided into five distinct lens elements (first through fifth lenses) with alternating positive and negative refractive powers. This segmentation allows each lens to be optimized for specific optical functions, enabling compact overall design while maintaining high optical performance through distributed aberration correction across multiple elements
Solution Approach 2:
The patent employs precise control of key optical parameters including the focal length ratios (f1/f between -20 to 2 and BFL/TTL between 0.4 to 0.9) and the third lens curvature ratio ((R31-R32)/(R31+R32) between 2 to 10). These parameter optimizations enable the lens assembly to achieve miniaturization while correcting aberrations and maintaining excellent optical quality
2Measurement precision
If the number of lens elements is increased to improve resolution, then optical performance improves, but device complexity and size increase
Solution Approach 1:
The lens assembly uses exactly five lens elements with alternating positive and negative refractive powers, creating a balanced structure that achieves high resolution through distributed aberration correction. This segmented approach provides sufficient optical performance without excessive complexity
Solution Approach 2:
Each lens element is designed with specific local optical properties: the third lens uses a biconvex shape with controlled curvature ratio to correct spherical aberration, while the fourth lens uses negative refractive power to correct coma and astigmatism. This localized optimization of each element's quality achieves high overall resolution with manageable complexity
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 lens assembly achieves a shortened total lens length while maintaining excellent optical performance, correcting aberrations and meeting the requirements of resolution and miniaturization, as demonstrated by specific optical specifications and diagrams.
Implementation Method 1
The first lens includes a convex surface facing the image side. The second lens includes a concave surface facing the object side. The third lens is a biconvex lens with positive refractive power. The fourth lens is with negative refractive power and includes a concave surface facing the object side. The fifth lens is with positive refractive power and includes a convex surface facing the image side.
Implementation Method 2
The lens assembly further includes a prism which includes an incident surface facing the convex surface of the fifth lens.
Implementation Method 3
The prism includes an incident surface facing an image side surface of the optical filter.
Data Source
AI summary
A lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens, all of which are arranged in order from an object side to an image side along an optical axis. The first lens includes a convex surface facing the image side. The second lens includes a concave surface facing the object side. The third lens is a biconvex lens with positive refractive power. The fourth lens is with negative refractive power and includes a concave surface facing the object side. The fifth lens is with positive refractive power and includes a convex surface facing the image side. The lens assembly satisfies: −20≤f1/f≤2, wherein f1 is an effective focal length of the first lens and f is an effective focal length of the lens assembly.