Seven-Lens Camera Assembly with f/EPD Ratio ≤1.9
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Solution Overview
Problem
Existing camera lens assemblies for portable electronic devices face challenges in achieving high imaging quality and miniaturization while maintaining a large aperture, especially in low-light conditions, due to limitations in aperture number and sensitivity.
Innovation Solution
A camera lens assembly comprising seven lenses with specific refractive powers and surface configurations, including convex and concave surfaces, optimized to achieve a total effective focal length to entrance pupil diameter ratio of ≤1.9, enhancing light admission and reducing edge field aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the aperture number Fno is increased to 2.0 or above to reduce lens assembly size, then miniaturization is achieved, but imaging quality in low-light conditions deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length to aperture diameter ratio (f/EPD ≤ 1.9) and carefully designing the refractive powers and surface curvatures of seven lenses. This allows achieving a larger effective aperture (lower Fno) while maintaining compact dimensions, thereby improving light admission capability without sacrificing miniaturization goals.
Solution Approach 2:
The patent segments the optical system into seven distinct lens elements with specific refractive powers and surface configurations. This segmentation allows each lens to contribute optimally to the overall performance, enabling the system to achieve both compact size and high light admission capability through coordinated design of individual elements rather than relying on a single large aperture.
2Manufacturing precision
If more lenses are added to improve imaging quality, then aberration correction is enhanced, but device complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific refractive powers (positive or negative) and surface configurations (convex or concave) to each of the seven lenses based on their position in the optical path. For example, the first lens has a positive refractive power with a convex object-side surface, while the third lens has a negative refractive power. This localized optimization allows effective aberration correction across different regions of the optical system without requiring excessive complexity.
Solution Approach 2:
The patent achieves multi-functionality by designing each lens element to serve multiple purposes: correcting specific types of aberrations, controlling light paths, and contributing to the overall focal length. The combination of seven lenses with varying refractive powers creates a universal optical system that addresses spherical aberration, coma, astigmatism, and field curvature simultaneously, reducing the need for additional specialized components.
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 enables improved imaging quality, miniaturization, and reduced sensitivity, making it suitable for portable electronic devices, particularly in low-light environments.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens... the first lens may have a positive refractive power, and an object side surface of the first lens is a convex surface; the second lens may have a positive refractive power, and an object side surface and an image side surface of the second lens are convex surfaces
Data Source
AI summary
The present disclosure describes a camera lens assembly having a total effective focal length f and an entrance pupil diameter EPD satisfying f/EPD≤1.9. The camera lens assembly includes, sequentially along an optical axis from an object side to an image side, the first to the seventh lenses. The first lens has a positive refractive power, and a convex object side surface; the second lens has a positive refractive power, and a convex object side surface and a convex image side surface; the third lens has a negative refractive power; the fourth lens and the fifth lens have a positive refractive power or negative refractive power; the sixth lens has a positive refractive power or negative refractive power, and a concave image side surface of the sixth lens is in a paraxial region; and the seventh lens has a negative refractive power, and a concave image side surface in the paraxial region.