Four-Lens Optical Imaging Assembly for Compact Mobile Devices
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Solution Overview
Problem
The challenge is to design an optical imaging lens assembly for portable electronic devices like mobile phones that balances the number of lenses to minimize length while maintaining high imaging quality and field of view, as reducing the number of lenses limits design freedom and imaging quality.
Innovation Solution
The optical imaging lens assembly consists of four lenses with specific refractive powers, surface shapes, and thickness configurations, including aspheric surfaces, to achieve ultra-thinness, high resolution, and high image quality by optimizing the refractive power, surface shape, and on-axis spaced intervals between lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the number of lenses is reduced to shorten the total length of the lens assembly, then the length is improved, but the design freedom and imaging quality deteriorate
Solution Approach 1:
The patent employs aspheric surfaces on multiple lenses (first, second, and third lenses have aspheric object-side surfaces) to change the geometric parameters of the lens surfaces. This allows for better control of light paths and aberrations with fewer lenses, thereby maintaining imaging quality while reducing the total length of the lens assembly.
2Length of moving object
If the number of lenses is reduced to shorten the total length of the lens assembly, then the length is improved, but the design freedom deteriorates
Solution Approach 1:
The patent introduces aspheric surface parameters (conic constants and higher-order coefficients) to expand the design space. By utilizing these additional parameters in the lens surface equations, the design freedom is maintained even with a reduced number of lenses, allowing for optimization of both compactness and imaging performance.
3Manufacturing precision
If aspheric surfaces are used to improve image quality and reduce distortion, then the imaging quality is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies aspheric surfaces to the object-side surfaces of the first, second, and third lenses. The aspheric profiles are defined by standard mathematical equations with conic constants and higher-order terms, which balance the need for improved optical performance with manufacturability using contemporary lens fabrication techniques.
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 allows for a compact, high-quality imaging lens assembly with a wide field of view, improved image quality, and reduced distortion, while maintaining the lenses' processability and avoiding excessive deflection of light, thus meeting the demands of portable electronic devices.
Implementation Method 1
Each of the first to the fourth lenses has refractive power
Data Source
AI summary
An optical imaging lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens and a fourth lens. Each of the first lens to the fourth lens has refractive power. A total effective focal length f of the optical imaging lens assembly and an effective focal length f1 of the first lens satisfy: 2.0<f1/f<6.5. A center thickness CT3 of the third lens along the optical axis and an edge thickness ET3 of the third lens satisfy: 2.5<CT3/ET3<4.0.