Imaging Lens Group Segmentation for Compact Design
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Solution Overview
Problem
Conventional imaging lens systems face challenges in achieving both compactness and high performance due to the need for complex focusing mechanisms, which lead to issues like dust contamination, eccentric errors, and inadequate correction of chromatic aberration, resulting in low image quality.
Innovation Solution
The proposed imaging lens system consists of a configuration with at least one positive lens element and a negative lens element, arranged next to each other, along with aspherical surfaces, adhering to specific conditional formulae to optimize axial thickness, refractive indices, and focal lengths, allowing for efficient correction of chromatic aberration and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional focusing mechanisms moving three to five lens elements together are used, then high performance is achieved, but the lens unit becomes large and complex
Solution Approach 1:
The lens unit is divided into three groups (first lens group with positive power, second lens group with negative power, third lens group with positive power). During focusing, only the second lens group moves while the first and third groups remain stationary, reducing the complexity of the focusing mechanism while maintaining image quality through optimized group configuration
Solution Approach 2:
The patent implements dynamic focusing by moving only the second lens group (with negative power) along the optical axis, while keeping the first and third lens groups stationary. This dynamic adjustment allows for compact design without sacrificing focusing capability or image quality
2Reliability
If conventional focusing mechanisms with multiple moving lens elements are used, then high performance is achieved, but dust contamination occurs
Solution Approach 1:
By segmenting the lens unit into three groups and restricting movement to only the second lens group, the patent reduces the number of moving parts that can generate dust, thereby minimizing dust contamination while maintaining focusing functionality
Solution Approach 2:
The patent extracts the focusing function from the entire lens assembly and concentrates it in the second lens group only. This extraction reduces the number of moving elements that generate dust, solving the dust contamination problem while preserving high-performance focusing
3Reliability
If the number of lens elements is increased for higher performance, then image quality improves, but compactness is compromised
Solution Approach 1:
The patent assigns specific optical powers to different lens groups: the first and third groups have positive power while the second group has negative power. This local differentiation of optical properties allows for compact configuration that corrects aberrations and maintains high image quality without increasing overall length
Solution Approach 2:
By implementing dynamic focusing through movement of only the second lens group while keeping the first and third groups stationary, the patent achieves a compact design that maintains high image quality through optimized optical power distribution across the three groups
4Reliability
If conventional focusing mechanisms are used, then high performance is achieved, but eccentric errors occur
Solution Approach 1:
Dividing the lens unit into three stationary and movable groups reduces the number of moving components, thereby minimizing the accumulation of eccentric errors and improving manufacturing precision while maintaining high-performance focusing
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 enables a compact and high-performance imaging lens system that effectively corrects chromatic aberration, reduces dust contamination, and maintains productivity, suitable for digital appliances like cellular phones and portable information terminals.
Implementation Method 1
an aspherically shaped lens element... which focuses light rays to form an optical image on the image sensor
Implementation Method 2
properly correct chromatic and spherical aberration... effectively corrects chromatic aberration
Data Source
AI summary
An imaging lens system has, from an object side, at least one positive lens element convex to the object side, a negative lens element, and at least one lens element having an aspherical surface. The positive and negative lens elements are arranged next to each other. The formulae 0.1<Ton/Dopn<7, 0.1<(Rona−Ronb)/(Rona+Ronb)<1.5, and 0.3<Y′/TL<0.9 are fulfilled, where Ton represents the axial thickness of the most object-side negative lens element, Dopn represents the axial distance between the most object-side negative lens element and the positive lens element located to the object side of and next to that negative lens element, Rona represents the paraxial radius of curvature of the object-side surface of the most object-side negative lens element, Ronb represents the paraxial radius of curvature of the image-side surface of the most object-side negative lens element, Y′ represents the maximum image height, and TL represents the axial distance from the vertex of the most object-side lens surface to the image surface (in a case where a parallel-plane plate is included, the air equivalent length).