Compact Three-Lens Optical Assembly for Mobile Imaging
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Solution Overview
Problem
Conventional optical systems for mobile devices are bulky, difficult to carry, and cannot meet the requirements of compactness and multi-functionality, especially with the increasing demand for higher megapixels and better image quality.
Innovation Solution
A compact optical lens assembly comprising three independent and non-cemented lens elements with specific aspheric surfaces and refractive powers, including a first lens element with positive refractive power, a second lens element with negative refractive power, and a third lens element with negative refractive power, optimized by conditions such as curvature radii and Abbe numbers to minimize aberrations and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional multi-piece lens structure with glass material and spherical surfaces is used, then image quality can be maintained, but the optical system becomes expansive and bulky
Solution Approach 1:
The optical system is divided into three independent lens elements with specific refractive powers (first positive, second negative, third positive), allowing each element to be optimized independently for compactness while collectively maintaining image quality through distributed optical functions
Solution Approach 2:
The patent employs aspheric surfaces for all lens elements instead of traditional spherical surfaces, enabling better control of light paths and aberrations in a compact configuration, with specific aspheric coefficients optimized to maintain image quality while reducing system size
Solution Approach 3:
The patent specifies precise parameter ranges including focal length ratios (0.3<f1/f<0.7, -0.5<f2/f<-0.2), curvature radii relationships (0.5<R1/R3<2.0), and axial distance ratios (0.4<T1/TD<0.8) to achieve compact dimensions while preserving optical performance
2Stability of the object's composition
If lens elements are cemented together, then structural stability is improved, but manufacturing complexity and difficulty increase
Solution Approach 1:
The patent designs three independent non-cemented lens elements that can be manufactured and assembled separately, eliminating the complex cementing process while maintaining structural stability through precise mechanical positioning and spacing control
Solution Approach 2:
The patent specifies precise axial distances (T1, T2, T3) and curvature radii for each independent lens element, allowing them to be positioned accurately without cementing, thereby simplifying manufacturing while maintaining optical alignment and structural stability
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 results in a more compact, portable, and high-quality image capturing device with improved image resolution, reduced spherical aberration, and enhanced chromatic aberration correction, suitable for compact electronic devices.
Implementation Method 1
The first lens element with positive refractive power has an object-side surface being convex, wherein the object-side surface and an image-side surface of the first lens element are aspheric. The second lens element with negative refractive power has an image-side surface being concave, wherein an object-side surface and the image-side surface of the second lens element are aspheric.
Implementation Method 2
the object-side surface and an image-side surface of the first lens element are aspheric. The second lens element with negative refractive power has an image-side surface being concave, wherein an object-side surface and the image-side surface of the second lens element are aspheric.
Implementation Method 3
When an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and an Abbe number of the third lens element is V3, the following conditions are satisfied: (V2+V3)/V1≤0.75
Data Source
AI summary
An optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element and a third lens element. The first lens element with positive refractive power has an object-side surface being convex, and the object-side surface and an image-side surface thereof are aspheric. The second lens element with negative refractive power has an image-side surface being concave, and an object-side surface and the image-side surface thereof are aspheric. The third lens element with refractive power has an object-side surface being concave, and the object-side surface and an image-side surface thereof are aspheric. The optical lens assembly further includes a stop with no lens element having refractive power disposed between the stop and the first lens element. The optical lens assembly has a total of three lens elements with refractive power.