Seven-Lens Camera Assembly for Ultra-Wide Low-Distortion Imaging
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Solution Overview
Problem
Existing camera lens assemblies for smartphones struggle to achieve ultra-wide angle, miniaturization, and high imaging quality while maintaining low distortion and manufacturability.
Innovation Solution
A camera lens assembly with a specific configuration of seven lenses, including aspheric surfaces, and optimized refractive powers and optical parameters, such as 15 mm<TTL×ImgH/f<18 mm and |DIST0.8F|<2%, to ensure wide field-of-view, low distortion, and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to achieve ultra-wide angle and high imaging quality, then the field-of-view and imaging quality are improved, but the total length and device complexity increase
Solution Approach 1:
The lens assembly is divided into seven distinct lens elements with alternating positive and negative refractive powers, where each lens contributes specifically to correcting certain aberrations. This segmentation allows achieving ultra-wide angle (≥120°) and high imaging quality without excessive total length by optimizing each segment's function
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements with specifically designed conic coefficients and higher-order terms. By changing the surface parameter from spherical to aspheric, the system achieves better aberration correction and compactness, resolving the contradiction between imaging quality and total length
2Adaptability or versatility
If the lens configuration is optimized for ultra-wide angle, then the field-of-view is improved, but the distortion increases
Solution Approach 1:
Different lens elements have different refractive power signs and surface curvatures tailored to their specific positions in the optical path. The first lens has negative refractive power for wide-angle coverage, while subsequent lenses alternately correct distortion locally, achieving ≤2% distortion across the ultra-wide field-of-view
Solution Approach 2:
The lens configuration uses asymmetric arrangement of positive and negative power elements, with the fourth lens having positive refractive power and larger aperture to specifically correct distortion. This asymmetric design enables ultra-wide field-of-view while maintaining low distortion through targeted correction zones
3Illumination intensity
If the aperture is increased to improve light gathering, then the imaging quality is improved, but the total length and complexity increase
Solution Approach 1:
The patent resolves the aperture-length contradiction by transitioning from a single large-aperture lens to a multi-element system where the fourth lens serves as the aperture stop with f-number ≤2.0. This dimensional change in optical design allows adequate light gathering while maintaining compact total length through distributed aperture management across multiple elements
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 ultra-wide angle, small distortion, and high imaging quality, with improved manufacturability and reduced total length, enhancing the camera's performance and production efficiency.
Implementation Method 1
a first lens having negative refractive power; a second lens having refractive power; a third lens having refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; a sixth lens having positive refractive power; and a seventh lens having negative refractive power
Data Source
AI summary
A camera lens assembly is provided. The camera lens assembly along an optical axis from an object side to an image side, sequentially includes: a first lens having negative refractive power; a second lens having refractive power; a third lens having refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; a sixth lens having positive refractive power; and a seventh lens having negative refractive power. A distance TTL from an object-side surface of the first lens to an image plane of the camera lens assembly on the optical axis, a half of a diagonal length ImgH of an effective pixel area of the camera lens assembly and a total effective focal length f of the camera lens assembly satisfy: 15 mm<TTL×ImgH/f<18 mm; and a distortion DIST0.8F of the camera lens assembly at an 0.8 field-of-view satisfies: |DIST0.8F|<2%.