Six-element optical imaging lens with aspherical surfaces for compact telephoto design
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Solution Overview
Problem
There is a challenge in designing optical imaging lenses that are compact enough to fit modern consumer electronic devices while maintaining good optical characteristics, as traditional methods of scaling down lenses do not effectively reduce size without compromising performance.
Innovation Solution
The optical imaging lens design involves controlling the convex or concave shape of each lens element and adjusting parameters such as air gaps and refracting indices to achieve a shorter length while maintaining good optical performance, incorporating a filtering unit and strategically placing an aperture stop to reduce stray light and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional scaling down methods are used to reduce lens size, then the dimensions of the optical imaging lens are decreased, but the optical characteristics and image quality deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the convex or concave shape parameters of each lens element surface and adjusting specific design parameters (such as the ratios of air gaps to focal lengths) to achieve optimal optical performance in a compact form factor. This allows the lens to maintain good optical characteristics while achieving a shortened total length.
Solution Approach 2:
The patent uses composite material strategies by combining lens elements with different refractive indices and Abbe numbers (e.g., high refractive index elements paired with low refractive index elements) to correct optical aberrations effectively in a compact design, thereby maintaining high image quality despite the reduced size.
2Length of moving object
If the distance from the first lens element to the image plane is reduced to achieve a slim profile, then the device thickness is decreased, but the telephoto characteristics and image quality are compromised
Solution Approach 1:
The patent achieves telephoto characteristics in a compact design by changing the parameter relationships between air gaps and focal lengths. Specifically, it controls the ratio of the air gap between the fourth and fifth lens elements to the focal length of the fourth lens element, and the ratio of the air gap between the fifth and sixth lens elements to the focal length of the fifth lens element, thereby achieving effective telephoto performance with a shortened overall length.
Solution Approach 2:
The patent employs aspherical surfaces on multiple lens elements to precisely control light ray paths, enabling the system to achieve telephoto characteristics with a compact form factor. The aspherical shapes allow for better aberration correction and more efficient light focusing compared to traditional spherical surfaces.
3Volume of moving object
If lens elements are made smaller to reduce overall lens dimensions, then the lens fits better in compact devices, but the assembly yield and manufacturing precision are reduced
Solution Approach 1:
The patent specifies particular parameter ranges for air gaps and focal length ratios that optimize both the optical performance and manufacturability of the lens system. These parameter controls ensure that the lens can be assembled with good yield while maintaining compact dimensions.
4Reliability
If the aperture stop is positioned to achieve telecentric effect, then the image reception efficiency is improved, but the view angle is reduced
Solution Approach 1:
The patent controls the position of the aperture stop relative to the optical elements and adjusts the system parameters to achieve a balance between telecentric effect and view angle. By optimizing the distance relationships and parameter ratios, the system can provide either telecentric characteristics or wide-angle performance depending on the specific design requirements.
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 approach results in an optical imaging lens with a shortened length, improved image quality, increased assembly yield, and enhanced telephoto characteristics, suitable for slim electronic devices.
Implementation Method 1
Each of the first, second, third, fourth, fifth and sixth lens elements may have refracting power
Implementation Method 2
a filtering unit
Data Source
AI summary
Present embodiments provide for an optical imaging lens. The optical imaging lens comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element positioned in an order from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens shows better optical characteristics and enlarge field angle the total length of the optical imaging lens is shortened.