Six-Lens Camera Module for Mobile Terminals
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Solution Overview
Problem
Miniaturization and lightweight design of mobile terminal camera modules pose challenges in achieving high resolution and performance while addressing chromatic aberration and implementing a bright optical system, especially with plastic lenses which are lighter than glass but harder to optimize.
Innovation Solution
A lens module comprising six lenses with specific refractive powers and surface configurations, including aspherical surfaces, that satisfy certain conditional expressions to enhance resolution, reduce aberration, and allow for a compact design, such as the first lens being convex on the object-side and concave on the image-side, and the sixth lens having an inflection point, while maintaining an F number of 2.4 or less for effective light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If lenses are formed of plastic to reduce weight, then the mobile terminal camera module becomes lighter, but chromatic aberration becomes difficult to solve
Solution Approach 1:
The patent uses plastic lens materials with specific refractive index ranges (1.50-1.70 for first lens, 1.60-1.80 for second lens, 1.40-1.60 for third lens) to achieve both lightweight construction and acceptable chromatic aberration control through material property optimization
Solution Approach 2:
The patent optimizes multiple parameters including refractive indices, Abbe numbers, focal lengths, and curvature radii to balance the lightweight advantage of plastic lenses with chromatic aberration correction requirements
2Illumination intensity
If the optical system is designed to be bright with low F number, then light transmission is improved, but chromatic aberration and other optical aberrations become more difficult to control
Solution Approach 1:
The patent achieves F number of 2.4 or less while controlling aberrations by optimizing the combination of refractive indices, focal lengths, and curvature radii across all six lenses, including setting specific ranges for f1, f2, f3, and their ratios
Solution Approach 2:
The sixth lens with negative refractive power and inflection point acts as an intermediary element to correct spherical aberration and coma that arise from the bright optical design, balancing light transmission with aberration control
3Volume of moving object
If the camera module is miniaturized to fit mobile terminals, then the device size is reduced, but it becomes difficult to implement high resolution and high performance
Solution Approach 1:
The patent divides the optical system into six distinct lens elements with specific functions, allowing each lens to be optimized for particular aberration corrections while maintaining a compact overall structure that achieves high resolution
Solution Approach 2:
The patent employs aspherical surfaces on multiple lenses (first, second, third, fourth, and sixth lenses) to correct spherical aberration and improve resolution within the miniaturized form factor, replacing traditional spherical surfaces with precision aspherical profiles
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 module achieves high resolution and improved image quality under low illuminance conditions, facilitates miniaturization, and reduces manufacturing costs by optimizing lens configuration and material usage.
Implementation Method 1
a first lens L1 having positive refractive power; a second lens L2 having positive refractive power; a third lens L3 having refractive power; a fourth lens L4 having positive refractive power; a fifth lens L5 having refractive power; and a sixth lens L6 having negative refractive power
Data Source
AI summary
A lens module include: a first lens having positive refractive power; a second lens having positive refractive power; a third lens having refractive power; a fourth lens having positive refractive power; a fifth lens having refractive power; and a sixth lens having negative refractive power and having an inflection point formed on an image-side surface thereof. The lens module may satisfy the following Conditional expressions: 0.36<SD/f<0.48, where SD is a size of a stop opening and f is an overall focal length of the lens module.