Five-Lens Optical Camera Lens Design for Low TTL and Large Aperture
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Solution Overview
Problem
Conventional camera lenses with a five-lens structure struggle to achieve a balance between long focal length, large aperture, and miniaturization, resulting in poor background weakening and imaging quality, especially with reduced pixel area and increased demands for low total track length and high imaging sensitivity.
Innovation Solution
A five-lens optical camera lens design with specific refractive power configurations and materials, including glass or plastic lenses with aspheric surfaces, where each lens's focal length and refractive index are optimized to control total track length, reduce field curvature, and enhance imaging quality, while maintaining a large aperture and miniaturized form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a five-lens structure is adopted to achieve long focal length, then the imaging quality and background weakening ability are improved, but the total track length increases and the aperture becomes small
Solution Approach 1:
The patent applies parameter changes by optimizing the focal lengths, refractive indices, and curvature radii of the five lens elements. Specific conditional expressions define the relationships between these parameters (e.g., focal length ratios, refractive index ranges) to achieve long focal length with reduced total track length. This allows the system to maintain high imaging quality while minimizing the overall lens length.
Solution Approach 2:
The patent utilizes composite material principles by combining lens elements with different refractive indices and Abbe numbers. Each lens element is made from optical materials with specifically selected properties (different refractive indices n1-n5 and Abbe numbers v1-v5) to correct chromatic aberrations and optimize the optical path, enabling compact design with improved imaging performance.
2Measurement precision
If a five-lens structure is adopted to achieve long focal length, then the background weakening ability is improved, but the aperture becomes small
Solution Approach 1:
The patent optimizes the aperture by carefully controlling the focal length ratios and positioning of the five lens elements. The conditional expressions define specific parameter ranges that allow the system to achieve a large aperture while maintaining the long focal length needed for background weakening. This balances the aperture size with the focal length requirements.
3Volume of moving object
If pixel size is reduced to miniaturize the camera lens, then the device size is reduced, but the imaging quality deteriorates
Solution Approach 1:
The patent divides the optical system into five distinct lens elements, each with specific functions and optimized parameters. This segmentation allows each element to contribute to correcting aberrations and optimizing the optical path, maintaining high imaging quality despite the reduced overall size. The divided structure enables better control of light paths in a compact form factor.
Solution Approach 2:
The patent uses optical materials with different refractive indices and dispersion properties to compensate for the reduced pixel size effects. By combining materials with specific properties (different n and v values), the system maintains high imaging quality in a miniaturized configuration.
4Measurement precision
If field curvature is reduced to improve imaging quality, then the imaging performance is improved, but the lens structure becomes more complex
Solution Approach 1:
The patent reduces field curvature by optimizing the curvature radii of the lens surfaces through specific parameter relationships. The conditional expressions define the relationships between curvature radii and focal lengths that effectively control field curvature. This approach corrects field curvature without requiring additional complex optical elements or structures.
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 effectively corrects aberrations, reduces field curvature, and improves imaging quality by controlling the total track length, achieving a large aperture and maintaining miniaturization, thus enhancing the ability to highlight objects and weaken backgrounds in low irradiance environments.
Implementation Method 1
the first lens L1 has positive refraction power, the second lens L2 has negative refraction power, the third lens L3 has positive refraction power, the fourth lens L4 has negative refraction power, and the fifth lens L5 has negative refraction power
Data Source
AI summary
The present disclosure relates to the field of optical lens, and discloses an optical camera lens, which includes: an aperture, a first lens having positive refraction power, a second lens having negative refraction power, a third lens having positive refraction power, a fourth lens having negative refraction power and a fifth lens having negative refraction power; the optical camera lens satisfies following relational expressions: 0.45<f1/f<0.55, −0.85<f2/f<−0.75, 2.0<f3/f<2.3, −3.4<f4/f<−3, −1.3<f5/f<−1.1, 0.2<f2/f4<0.3. The optical camera lens provided by the present disclosure can meet the design requirements on low TTL and large aperture, which has good sensitivity performance.