Seven-Lens Optical Imaging Assembly for Smartphone Aberration Control
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Solution Overview
Problem
Current optical imaging lens assemblies for high-end smartphones face challenges in achieving large image surface, high resolution, and small size with effective aberration control and tolerance sensitivity reduction.
Innovation Solution
An optical imaging lens assembly comprising seven lenses, with specific refractive powers and surface types, including aspheric surfaces, is designed to balance low-order aberrations and reduce tolerance sensitivity, achieving a large image surface and ultra-thin design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to improve imaging quality and aberration control, then optical performance is improved, but device complexity and size increase
Solution Approach 1:
The lens assembly is divided into seven independent lens elements with specific refractive powers and surface types. Each lens element is optimized for specific aberration correction, allowing complex optical performance to be achieved through modular segmentation rather than a single complex lens.
Solution Approach 2:
Different lens elements have different surface configurations (convex, concave, aspheric) and refractive powers tailored to their specific positions in the optical path. For example, the first lens has positive refractive power with specific surface curvatures, while the seventh lens has negative refractive power, creating local optimization for aberration control at different stages of light propagation.
2Area of stationary object
If the image surface size is increased to capture wider scenes, then field of view is improved, but the optical path length and device thickness increase
Solution Approach 1:
The lens assembly incorporates aspheric surfaces on multiple lens elements, including the first lens with aspheric object-side and image-side surfaces, and the sixth lens with aspheric surfaces. These curved surfaces enable light rays from wide angles to converge properly on the imaging surface, achieving large image surface coverage without proportionally increasing optical path length.
Solution Approach 2:
The patent specifies precise parameter relationships, such as the conditional expression for the ratio of effective focal length to entrance pupil diameter (f/EPD), and specific curvature radius relationships for the sixth lens. These parameter optimizations enable compact optical path design that accommodates large image surfaces.
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 achieves high imaging quality with balanced aberrations and reduced sensitivity, enabling a large image surface and ultra-thin design suitable for high-end smartphone cameras.
Implementation Method 1
an optical imaging lens assembly, which sequentially includes, from an object side to an image side along an optical axis: a first lens with a positive refractive power; a second lens with a refractive power; a third lens with a refractive power; a fourth lens with a positive refractive power; a fifth lens with a refractive power
Data Source
AI summary
The disclosure provides an optical imaging lens assembly, which sequentially includes, from an object side to an image side along an optical axis: a first lens with a positive refractive power; a second lens with a refractive power; a third lens with a refractive power; a fourth lens with a positive refractive power; a fifth lens with a refractive power, an object-side surface thereof being a convex surface while an image-side surface being a concave surface; a sixth lens with a positive refractive power, an object-side surface thereof being a convex surface while an image-side surface being a convex surface; and a seventh lens with a negative refractive power. ImgH is a half of a diagonal length of an effective pixel region on an imaging surface, TTL is an on-axis distance from an object-side surface of the first lens to the imaging surface, ImgH and TTL satisfy: 4.0 mm<ImgH×ImgH/TTL<6.0 mm.