Six-Lens Imaging Assembly for Thin Wide-Angle Camera Modules
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Solution Overview
Problem
The design of optical systems for mobile phone cameras faces challenges in achieving large image plane, large wide angle, large aperture, and ultra-thin form factors, which are essential for high-resolution imaging and improved compatibility with smartphones, while maintaining assembly stability and imaging quality.
Innovation Solution
An optical imaging lens assembly comprising a specific arrangement of lenses with positive and negative refractive powers, including meniscus lenses, and spacing elements that control light paths and reduce stray light, ensuring a balanced aberration correction and miniaturization, with parameters satisfying specific ratios and dimensions to enhance imaging quality and assembly stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens assembly is designed with large image plane, large wide angle, and large aperture to improve imaging quality, then the resolution and signal-to-noise ratio are improved, but the thickness and overall size of the lens assembly increases
Solution Approach 1:
The lens assembly is divided into six distinct lens elements (first through sixth lenses) with different refractive powers and structural characteristics. Each lens element performs specific optical functions, allowing the system to achieve complex imaging requirements while maintaining compact overall dimensions. The segmentation enables independent optimization of each element to balance imaging quality and thickness.
Solution Approach 2:
The patent employs multiple parameters including refractive indices (1.5456, 1.6719, 1.5456, 1.6225), Abbe numbers (56.1, 32.7, 56.1, 58.8), and conic coefficients (-0.1156, 0.2857, -0.3421, 0.1587, -0.0543, 0.0987) to precisely control the optical properties of each lens element. By adjusting these parameters, the system achieves large aperture and wide angle while maintaining ultra-thin profile through mathematical optimization of the optical path.
2Measurement precision
If multiple lens elements are added to correct aberrations and improve imaging quality, then the aberration correction capability is improved, but the device complexity and number of components increases
Solution Approach 1:
Each lens element serves multiple functions simultaneously. For example, the first lens with positive refractive power not only converges light but also begins correction of spherical aberration. The sixth lens with inflection points on its image-side surface provides both field curvature correction and distortion control. This multi-functionality reduces the need for additional dedicated correction elements, simplifying the overall structure.
Solution Approach 2:
The patent uses lenses with different material properties (refractive indices and Abbe numbers) to create a composite optical system. The combination of materials with different dispersion characteristics enables chromatic aberration correction while the varying refractive indices allow precise control of light paths. This composite approach achieves superior aberration correction without requiring an excessive number of elements.
3Length of moving object
If the lens assembly is designed for ultra-thin form factor to improve compatibility with smartphones, then the portability and integration are improved, but the aperture size and light gathering capability are reduced
Solution Approach 1:
The patent compensates for the limited aperture size in the thickness dimension by optimizing the radial dimensions and light path angles. The sixth lens with inflection points on its image-side surface creates optimized light paths that maximize light gathering efficiency within the constrained thickness. This dimensional optimization allows the system to maintain large aperture characteristics despite the ultra-thin overall form factor.
Solution Approach 2:
The spacing elements positioned between lens groups act as intermediaries that precisely control the air gaps and light paths. These elements enable the compact arrangement of lens elements while maintaining optimal spacing for light transmission. The first spacing element with specific inner and outer diameters creates controlled light paths that maximize luminous flux transmission through the ultra-thin assembly.
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 lens assembly effectively balances aberrations, reduces stray light, and ensures a compact design, improving imaging quality and assembly stability, while meeting the requirements of large image plane and ultra-thin form factors.
Implementation Method 1
the sixth lens has at least one inflection point on an image-side surface
Implementation Method 2
a plurality of spacing elements, including a first spacing element disposed between the first lens and the second lens and in contact with an image-side surface of the first lens
Data Source
AI summary
An optical imaging lens assembly, including: an imaging lens group, consisting of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from an object side to an image side along an optical axis, where the sixth lens has at least one inflection point on an image-side surface; a plurality of spacing elements, including a first spacing element disposed between the first lens and the second lens, a second spacing element disposed between the second lens and the third lens, a third spacing element disposed between the third lens and the fourth lens and a fifth spacing element disposed between the fifth lens and the sixth lens; and a lens barrel.