Six-Lens Camera Module Optimizing TTL/IH Ratio
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Solution Overview
Problem
Existing camera lenses with six-piece configurations for mobile phone and webcam applications face challenges in achieving ultra-thin, high-luminous flux, and wide-angle optics with insufficient refractive power distribution and improper lens shapes, leading to suboptimal performance in terms of TTL/IH ratio and Fno values.
Innovation Solution
A camera lens design comprising six lenses with specific refractive power distributions and aspheric shapes, meeting conditions such as -100.00≦f3/f≦−25.00 and 2.00≦f4/f≦15.00, to achieve an ultra-thin, wide-angle configuration with Fno ≤ 2.10, characterized by optimized curvature radii and refractive powers for each lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the camera lens uses a six-piece configuration with conventional refractive power distribution, then the lens structure is established, but the TTL/IH ratio is insufficient (≥1.464) and cannot achieve ultra-thin performance
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution across the six lenses, specifically setting the third lens with negative refractive power to have a focal length ratio f3/f within -50.00 to -10.00, and the fourth lens with positive refractive power to have f4/f within 5.00 to 15.00. These parameter adjustments enable the TTL/IH ratio to be 1.40 or less while maintaining excellent optical properties including Fno of 2.10 or less and wide angle of view of 78 degrees or more.
2Length of moving object
If the third lens has insufficient refractive power and improper shape, then the lens assembly is simplified, but the TTL/IH ratio cannot be reduced below 1.464
Solution Approach 1:
The patent changes the refractive power parameters of the third and fourth lenses to achieve ultra-thin performance. Specifically, the third lens is designed with negative refractive power where f3/f is between -50.00 and -10.00, and the fourth lens has positive refractive power where f4/f is between 5.00 and 15.00. These parameter modifications enable the system to achieve TTL/IH of 1.40 or less without overly complicating the lens configuration.
3Length of moving object
If the lens design prioritizes ultra-thin profile, then TTL/IH ratio is reduced, but achieving Fno ≤ 2.10 and wide angle ≥ 78° becomes more difficult
Solution Approach 1:
The patent employs parameter changes across multiple lenses to simultaneously achieve ultra-thin profile and high optical performance. The specific parameters include: third lens with f3/f between -50.00 and -10.00, fourth lens with f4/f between 5.00 and 15.00, and shape parameters (R3+R4)/(R3-R4) between 1.00 and 3.00. These coordinated parameter adjustments enable the lens to achieve TTL/IH of 1.40 or less while maintaining Fno of 2.10 or less and wide angle of view of 78 degrees or more.
Solution Approach 2:
The patent applies local quality by assigning specific refractive power characteristics to specific lenses within the six-piece configuration. The third lens is designed with negative refractive power and specific shape parameters to control light convergence, while the fourth lens has positive refractive power to diverge light. This localized optimization of refractive power distribution enables the system to achieve ultra-thin profile while maintaining excellent optical performance including low Fno and wide angle of view.
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 results in a camera lens with excellent optical properties, achieving a TTL/IH ratio ≤ 1.42, a total angle of view ≥ 78°, and Fno ≤ 2.10, ensuring ultra-thin, high-luminous flux, and wide-angle performance.
Implementation Method 1
a first lens with positive refractive power; a second lens with negative refractive power; a third lens with negative refractive power; a fourth lens with positive refractive power and a fifth lens with positive refractive power; a sixth lens with negative refractive power
Data Source
AI summary
A camera lens includes, arranged sequentially from an object side to an image side: a first lens with positive refractive power; a second lens with negative refractive power; a third lens with negative refractive power; fourth lens with positive refractive power; a fifth lens with positive refractive power; and a sixth lens with negative refractive power. The camera lens satisfies specific conditions.