Folded Optical Path Lens Assembly for Mobile Miniaturization
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Solution Overview
Problem
Current lens assemblies for mobile phones face challenges in achieving high resolution while maintaining a thin and lightweight design, as the increasing number of lenses leads to longer total lengths that do not meet miniaturization requirements.
Innovation Solution
A lens assembly comprising a specific arrangement of lenses with positive and negative refractive powers, including a reflective element, optimized to achieve a shortened total lens length while maintaining high resolution and good optical performance, by satisfying conditions such as TTL/f > 1.2 and 2 mm < L < 6 mm, where TTL is the total length of the optical system and f is the effective focal length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to achieve high resolution, then the resolution is improved, but the total length of the lens assembly becomes longer
Solution Approach 1:
The patent introduces a reflective element (mirror) to fold the optical path, changing the linear arrangement into a folded configuration. This allows the light to traverse a longer effective optical path within a shorter axial length, achieving high resolution without proportionally increasing the total lens assembly length. The reflective element creates a non-linear optical path that effectively utilizes three-dimensional space.
Solution Approach 2:
The patent arranges lenses and the reflective element in a compact nested configuration where components are positioned to overlap or interleave in the axial direction. The reflective element is disposed between specific lenses, and the optical path is folded back through the assembly, allowing multiple optical elements to occupy overlapping spatial regions and reducing the overall axial length.
2Length of moving object
If the total length of the lens assembly is shortened to achieve miniaturization, then the compactness is improved, but the optical performance may deteriorate
Solution Approach 1:
By folding the optical path using the reflective element, the patent extends the effective optical path length without increasing the axial length of the assembly. This allows sufficient optical path for high-quality imaging while maintaining a compact form factor, thus preserving optical performance in a shortened assembly.
Solution Approach 2:
The patent optimizes specific parameters including the focal lengths of individual lenses, the position of the reflective element, and the spacing between components to satisfy specific ratios (such as TTL/f > 1.2). These parameter optimizations ensure that despite the shortened axial length, the optical performance including resolution and aberration correction are maintained at high levels.
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 solution effectively shortens the total lens length, increases resolution, corrects aberrations, and improves chromatic aberration correction, ensuring good optical performance and miniaturization.
Implementation Method 1
The reflective element includes a reflective surface
Implementation Method 2
The first lens is with positive refractive power and includes a concave surface facing an object side and a convex surface facing an image side. The second lens is with negative refractive power and includes a concave surface facing the object side.
Data Source
AI summary
A lens assembly includes a first lens, a second lens, a third lens, and a fourth lens. The first lens is with positive refractive power and includes a concave surface facing an object side and a convex surface facing an image side. The second lens is with negative refractive power and includes a concave surface facing the object side. The third lens is with positive refractive power. The fourth lens is with refractive power and includes a concave surface facing the image side. The first lens, the second lens, the third lens, and the fourth lens are arranged in order from the object side to the image side along an optical axis. The lens assembly satisfies: TTL/f>1.2; wherein TTL is a total length of optical system of the lens assembly and f is an effective focal length of the lens assembly.