Six-Lens Optical Assembly with Negative-Positive Power Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lens assemblies require 8 to 10 lenses to achieve good optical performance, resulting in a lengthy total lens length that is not suitable for miniaturization.
Innovation Solution
A lens assembly comprising six lenses with specific refractive powers and arrangements, including a first lens with negative refractive power, a second lens with negative refractive power, a third and fourth lens with positive refractive power, a fifth lens with negative refractive power, and a sixth lens with positive refractive power, optimized to achieve a shortened total lens length while maintaining good optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 8 to 10 lenses are used to correct aberration and provide good optical performance, then optical performance is improved, but total lens length becomes too long for miniaturization
Solution Approach 1:
The patent combines multiple lens functions into a six-lens assembly where lenses with different refractive powers (negative, positive, and cemented combinations) work together to correct both aberration and chromatic aberration. This merging of optical functions into fewer elements achieves good optical performance while reducing total lens length compared to conventional 8-10 lens designs
Solution Approach 2:
The patent employs specific refractive power parameters for each lens element (negative, positive, and cemented combinations) and optimizes the ratio relationships between focal lengths (e.g., f1/f, f2/f, f6/f) to achieve effective aberration correction with a compact six-lens configuration, thereby reducing total lens length while maintaining optical performance
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 six-lens assembly effectively corrects aberration and chromatic aberration, achieving a shortened total lens length and maintaining excellent optical performance, as demonstrated by various embodiments and optical specifications.
Implementation Method 1
The first lens is with negative refractive power, the second lens is with negative refractive power, the third and fourth lenses are with positive refractive power, the fifth lens is with negative refractive power, and the sixth lens is with positive refractive power
Data Source
AI summary
A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens is with negative refractive power. The second lens is with negative refractive power. The third and fourth lenses are with positive refractive power. The fifth lens is with negative refractive power. The sixth lens is with positive refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged in order from an object side to an image side along an optical axis. The lens assembly satisfies: 4.9≤TTL/f≤11.5; wherein TTL is an interval from an object side surface of the first lens to an image plane along the optical axis and f is an effective focal length of the lens assembly.