Six-Element Mobile Lens Assembly Aberration Correction
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Solution Overview
Problem
Conventional compact optical systems for mobile devices, such as smartphones and tablets, face challenges in achieving high image quality and resolution due to aberration issues caused by strong refractive powers in their lens elements, particularly in six-element lens structures that attempt to maintain compactness.
Innovation Solution
A photographing optical lens assembly comprising six lens elements with specific refractive powers and surface shapes, including a first lens with positive refractive power, a second lens with positive refractive power and convex surfaces, a third lens with refractive power and concave surfaces, a fourth lens with positive refractive power, a fifth lens with negative refractive power, and a sixth lens with concave and convex surfaces in paraxial and off-axis regions, arranged to correct aberrations and maintain compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the refractive power of the first lens element and the second lens element are enhanced to keep the optical system compact, then the optical system size is reduced, but the aberration correction becomes unfavorable leading to worse image quality
Solution Approach 1:
The optical system is divided into six distinct lens elements with alternating positive and negative refractive powers. This segmentation allows the aberration correction function to be distributed across multiple elements rather than concentrated in one or two elements with excessively strong refractive power, thus maintaining compact size while improving image quality.
Solution Approach 2:
Each lens element is designed with specific local optical properties - the first four elements have positive refractive power while the fifth has negative refractive power, and the sixth element has a specific focal length relationship with the first element. This localized optimization of refractive power distribution enables compact design without compromising aberration correction.
2Manufacturing precision
If a six-element lens structure is used to enhance image quality and resolution, then image quality is improved, but the optical system becomes less compact
Solution Approach 1:
The patent specifies precise parameter relationships between the six lens elements, including the focal length relationship |f6| > |f1| and the alternating sign pattern of refractive powers. These parameter constraints enable the system to achieve high image quality with a compact six-element structure by optimizing the distribution of optical power rather than simply increasing the number of elements.
3Volume of moving object
If conventional five-element lens structure is used, then the optical system remains compact, but it cannot satisfy the requirements of high resolution and image quality
Solution Approach 1:
By segmenting the optical system into six elements instead of five, the patent adds an additional degree of freedom for aberration correction. The sixth element, with its specific focal length relationship to the first element, provides enhanced control over optical parameters, enabling higher resolution and image quality while maintaining compact dimensions.
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 corrects aberrations, reduces photosensitivity, and enhances image quality by balancing refractive powers and using aspheric surfaces, while maintaining a compact design suitable for mobile devices.
Implementation Method 1
The first lens element has positive refractive power, the second lens element has positive refractive power, the third lens element has refractive power, the fourth lens element has positive refractive power, the fifth lens element has negative refractive power
Data Source
AI summary
A photographing optical lens assembly includes, in order from the object side to the image side, 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. The first lens element, the second lens element and the fourth lens element have positive refractive power. The third lens element has refractive power. The fifth lens element has negative refractive power. The sixth lens element with refractive power has an image-side surface being concave in a paraxial region thereof and having at least one convex shape in an off-axis region thereof. An object-side surface and an image-side surface of the sixth lens element both are aspheric. Both of an absolute value of a focal length of the fourth lens element and that of the fifth lens element each are greater than those of the other lens elements.