Camera Lens Assembly Focal Length Optimization
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Solution Overview
Problem
Conventional camera lens assemblies for portable electronic devices face challenges in achieving high pixels, good image quality, and low sensitivity while maintaining miniaturization and lightweight design, due to limitations in focal length and field-of-view angle configurations.
Innovation Solution
A camera lens assembly comprising a sequence of lenses with specific focal powers, surface curvatures, and thickness ratios, including a first positive lens, a second positive lens with convex surfaces, a third negative lens, and subsequent lenses with optimized focal lengths and spacings, to form a total effective focal length that balances sensitivity and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large aperture configuration is adopted to meet high pixel requirements, then the pixel count increases, but the lens assembly size increases
Solution Approach 1:
The patent changes the optical parameters by using a positive-negative-positive lens configuration with specific focal length ratios (|f/f1|≤0.5, |f/f2|≤0.5, |f/f3|≤1.5) and curvature radius relationships (R1/R2≥0.5, R3/R4≥0.5). This parameter optimization allows achieving high pixel performance with reduced lens assembly size compared to conventional large aperture designs.
2Measurement precision
If multiple lenses are added to increase field-of-view angle for high image quality, then the image quality improves, but the lens assembly size and weight increase
Solution Approach 1:
The patent optimizes the system by carefully selecting focal lengths and curvature radii of each lens element. The specific constraints (|f/f1|≤0.5, |f/f2|≤0.5, |f/f3|≤1.5, R1/R2≥0.5, R3/R4≥0.5) enable achieving high image quality and expanded field-of-view with only three main lens elements, avoiding the need for more complex multi-element assemblies.
3Measurement precision
If the second negative lens has larger focal power to correct aberrations, then the optical performance improves, but the system sensitivity increases making processing difficult
Solution Approach 1:
The patent inverts the conventional lens configuration by using a positive-negative-positive arrangement instead of the traditional negative-positive-negative or other configurations. This inversion allows the second lens to have controlled focal power while maintaining optical performance, reducing system sensitivity and facilitating manufacturing processing.
Solution Approach 2:
The patent changes the focal power distribution across lens elements by imposing specific constraints: |f/f1|≤0.5, |f/f2|≤0.5, |f/f3|≤1.5. This parameter optimization ensures that no single lens element has excessive focal power, thereby reducing system sensitivity while maintaining optical performance and ease of manufacture.
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 a camera lens assembly with higher pixels, improved image quality, and reduced sensitivity, making it suitable for portable electronic products by effectively managing longitudinal chromatic aberration and distortion.
Implementation Method 1
a first lens, a second lens, a third lens and a plurality of subsequent lenses are arranged in sequence from an object side to an image side along an optical axis. The first lens, the second lens, the third lens and the plurality of subsequent lenses jointly form a total effective focal length f
Data Source
AI summary
The present application discloses a camera lens assembly and a camera device equipped with the camera lens assembly. The camera lens assembly includes: a first lens, a second lens, a third lens and multiple subsequent lenses arranged in sequence from an object side to an image side along an optical axis. The first lens, the second lens, the third lens and the multiple subsequent lenses jointly form a total effective focal length f, wherein a combined focal length f12 of the first lens and the second lens and a focal length f3 of the third lens satisfy: −0.7<f12/f3<0.