Seven-Lens Optical Imaging Camera Assembly with f/EPD Ratio
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Solution Overview
Problem
Current optical imaging camera lens assemblies face challenges in achieving high-definition imaging with lower costs and optimal technical parameters, such as refractive power and material selection, which affects their performance and manufacturing efficiency.
Innovation Solution
The optical imaging camera lens assembly is designed with a specific configuration of seven lenses, including plastic and glass materials, where refractive powers and surface shapes are strategically allocated to achieve a high-definition imaging system with a large aperture and reduced sensitivity, incorporating aspheric surfaces and a diaphragm to enhance image quality and manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional optical lens assemblies are used to achieve high-definition imaging, then imaging quality is improved, but manufacturing cost increases and manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices, Abbe numbers, and curvature radii of all seven lenses. Specific parameter ranges are defined for each lens (e.g., first lens refractive index 1.505-1.650, Abbe number 20.0-40.0) to optimize imaging quality while maintaining manufacturability. The conditional expressions (1) through (7) establish parameter relationships that balance performance and cost.
Solution Approach 2:
The patent uses composite material strategy by combining different lens materials with specific optical properties. The sixth lens is specified as glass material while other lenses use materials with varying refractive indices and Abbe numbers. This composite approach allows optimization of each lens's contribution to overall imaging performance while managing manufacturing costs through selective material usage.
2Manufacturing precision
If more lenses are added to improve imaging quality, then optical performance is improved, but device complexity increases
Solution Approach 1:
The patent segments the optical system into seven distinct lenses, each with specific functions and parameter ranges. This segmentation allows independent optimization of each lens while managing overall system complexity. Each lens can be designed, manufactured, and adjusted separately, facilitating modular assembly and simplifying the management of complex optical interactions.
Solution Approach 2:
The patent applies local quality by assigning different material properties, curvature radii, and thicknesses to each lens based on its specific position and function in the optical path. For example, the fourth lens has negative refractive power with specific curvature constraints, while the sixth lens is specified as glass material. This localized optimization ensures each lens contributes maximally to imaging quality without requiring uniform complexity across all elements.
3Use of energy by moving object
If aperture is increased to improve light gathering capability, then imaging performance is improved, but sensitivity to manufacturing errors increases
Solution Approach 1:
The patent controls parameter changes by defining specific ranges for the aperture diameter relative to focal length (f/2.0 to f/3.5) and establishing conditional expressions that relate aperture to other lens parameters. This controlled parameter variation allows large aperture design while maintaining tolerance to manufacturing errors through coordinated adjustment of multiple lens parameters.
Solution Approach 2:
The patent employs phase transitions in the sense of transitioning from spherical to aspheric surfaces for certain lenses. This surface type transition allows better control of light rays across the large aperture, reducing aberrations and making the system less sensitive to manufacturing errors. The aspheric surfaces provide more degrees of freedom for correcting optical errors.
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 results in a lens assembly that achieves high-definition imaging with a large aperture, low cost, and improved imaging quality while reducing sensitivity and manufacturing complexity, facilitating mass production.
Implementation Method 1
a first lens E1 having a refractive power; a second lens E2 having a positive refractive power; a third lens E3 having a refractive power; a fourth lens E4 having a negative refractive power; a fifth lens E5 having a positive refractive power; a sixth lens E6 having a refractive power; and a seventh lens E7 having a refractive power
Data Source
AI summary
The disclosure provides an optical imaging camera lens assembly, sequentially including, from an object side to an image side along an optical axis: a first lens having a refractive power; a second lens having a positive refractive power; a third lens having a refractive power; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power; a sixth lens having a refractive power; and a seventh lens having a refractive power. At least four lenses among the first lens to the fifth lens are lenses made of a plastic material; the sixth lens is a spherical lens made of a glass material; and a total effective focal length f of the optical imaging camera lens assembly and an entrance pupil diameter (EPD) of the optical imaging camera lens assembly satisfy: f/EPD<1.2.