Four-Lens Camera Module with Optimized Refractive Power Distribution
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Solution Overview
Problem
Existing camera lenses with four-piece configurations for mobile phone and webcam applications suffer from insufficient refractive power distribution and improper lens shapes, leading to inadequate brightness and optical performance, particularly in achieving ultra-thin and high-luminous flux wide-angle capabilities.
Innovation Solution
A camera lens design comprising four lenses with specific refractive power distributions and shapes, including a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, and a fourth lens with negative refractive power, optimized by a glass plate or optical filter between the fourth lens and the imaging surface, adhering to specific focal length and curvature radius conditions to correct aberrations and enhance optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a four-piece lens configuration is used for miniaturization, then the lens size is reduced, but the brightness (Fno) becomes insufficient
Solution Approach 1:
The patent changes the refractive power distribution parameters and surface curvature parameters of the four lenses to achieve both miniaturization and high brightness. Specifically, the first lens has positive refractive power with specific curvature radii (R1, R2), the second lens has negative refractive power, the third lens has positive refractive power, and the fourth lens has negative refractive power. These parameter optimizations enable the lens assembly to achieve Fno≤2.0 while maintaining a compact form factor suitable for mobile phones and web cameras.
2Device complexity
If the refractive power distribution is insufficient in the first and fourth lenses, then the lens structure is simpler, but the optical performance (brightness) deteriorates
Solution Approach 1:
The patent applies local quality by assigning specific refractive power characteristics to different lens positions. The first lens and fourth lens are given positive and negative refractive powers respectively, while the second and third lenses have complementary powers. This localized optimization of refractive power distribution across the four lenses achieves high brightness (Fno≤2.0) without requiring a more complex lens structure, maintaining the simplicity of the four-piece configuration.
3Ease of manufacture
If the lens shape is improper, then the manufacturing is easier, but the aberration correction becomes insufficient
Solution Approach 1:
The patent employs curved surface design for all four lenses with specifically optimized curvature radii. The first lens has object-side surface radius R1 and image-side surface radius R2, the second lens has radii R3 and R4, the third lens has radii R5 and R6, and the fourth lens has radii R7 and R8. These curvature optimizations enable effective aberration correction while maintaining manufacturability through standard lens fabrication processes.
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 design achieves a small-sized, wide-angle camera lens with high luminous flux and excellent optical performance, specifically a total angle of view greater than 80° and F-number less than or equal to 2.0, effectively addressing the limitations of previous designs by improving aberration correction and miniaturization.
Implementation Method 1
a first lens with positive refractive power
Implementation Method 2
a second lens with negative refractive power
Implementation Method 3
a third lens with positive refractive power
Implementation Method 4
a fourth lens with negative refractive power
Implementation Method 5
optimized by a glass plate or optical filter having the function of filtering IR can be taken as the glass plate GF
Data Source
AI summary
A camera lens is disclosed. The camera lens includes: a first lens with positive refractive power; a second lens with negative refractive power; a third lens with positive refractive power; a fourth lens with negative refractive power, which are arranged sequentially from an object side. The camera lens is characterized in that it satisfies specified conditions.