Six-Lens Imaging Assembly Layout for Stray Light and Weld Mark Control
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Solution Overview
Problem
Six-piece optical imaging lens assemblies face issues with stray light and weld marks due to improper placement of the fifth and sixth lenses and their support members, affecting imaging quality.
Innovation Solution
The optical imaging lens assembly is designed with specific constraints on spacing distances, refractive powers, and support member placements to optimize the edge thicknesses of the fifth and sixth lenses, ensuring proper vector height ratios and blocking stray light, thereby reducing weld marks during molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the fifth lens and sixth lens are disposed close to each other to reduce assembly size, then the lens assembly becomes more compact, but stray light increases and imaging quality deteriorates
Solution Approach 1:
A support member is introduced as an intermediary component between the fifth lens and sixth lens. This support member includes a blocking structure that physically intercepts and blocks stray light paths while allowing the lenses to maintain their compact spacing arrangement. The support member acts as a mediator that enables close lens placement without compromising imaging quality.
2Manufacturing precision
If the edge thickness of the fifth lens is reduced to optimize imaging performance, then imaging quality improves, but weld marks during molding increase
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships between the edge thickness of the fifth lens and other critical dimensions such as the spacing distance between lenses and the diameter of the support member. By controlling these parameters within defined ranges, the design achieves optimal imaging performance while preventing weld marks during the molding process.
3Volume of moving object
If the spacing distance between the fifth lens and sixth lens is reduced to compact the assembly, then the lens assembly becomes smaller, but assembly stability decreases
Solution Approach 1:
The support member serves as a stabilizing intermediary structure between the fifth lens and sixth lens. It provides mechanical reinforcement and precise positioning that maintains assembly stability even when the spacing distance is minimized. The support member's blocking structure also contributes to structural rigidity in the compact configuration.
4Manufacturing precision
If the vector height ratio of the fifth lens is optimized to block stray light, then imaging quality improves, but the complexity of the support member structure increases
Solution Approach 1:
The support member is designed with local quality by concentrating the blocking function at specific strategic locations rather than requiring complex structures throughout. The blocking structure is positioned precisely where stray light paths intersect, providing effective stray light blocking with minimal structural complexity. The support member's geometry is optimized to achieve the required vector height ratio only where necessary.
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 design improves imaging quality by minimizing weld marks and stray light, enhancing assembly stability, and optimizing the imaging performance of the lens assembly.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power
Data Source
AI summary
The disclosure discloses an optical imaging lens assembly, including: a lens barrel, and a lens group and a support member group, which are accommodated in the lens barrel, wherein the lens group includes a first lens to a sixth lens, which are sequentially arranged from an object side to an image side along an optical axis; the first lens, a second lens, a fourth lens and a fifth lens have a positive refractive powers, and a third lens and the sixth lens have a negative refractive powers; the support member group includes a fourth support member disposed between the fourth lens and the fifth lens and a fifth support member disposed between the fifth lens and the sixth lens; and the optical imaging lens assembly satisfies: 3.8<T56/T45<6.8, 1.7<EP45/T45<4.5, and 1.6<f5/(D5s−d5s)<2.8.