Optical Camera Lens with Refractive Power Ratios for Compact Design
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Solution Overview
Problem
Conventional camera lenses for portable devices face challenges in achieving high imaging quality with a large aperture and short total track length, especially in micro camera devices, due to their five-lens structure which results in poor background weakening and inability to highlight objects effectively.
Innovation Solution
A five-lens optical camera lens design with specific refractive power configurations and materials, including glass or plastic lenses with aspheric surfaces, that satisfy certain focal length and refractive index relations to control total track length, reduce field curvature, and enhance imaging quality, while maintaining miniaturization and large aperture capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a five-lens structure is adopted to improve imaging quality, then imaging quality is improved, but total track length increases and aperture decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices and focal lengths of each lens element. Specifically, it sets the refractive index range for the second lens (1.6-1.7) and third lens (1.6-1.7) to optimize the balance between imaging quality and compactness. The focal length relationships are defined as: f1>0, f2<0, f3>0, f4<0, f5<0, with specific ratios between adjacent lens focal lengths to minimize total track length while maintaining large aperture and good imaging performance.
Solution Approach 2:
The patent uses composite material strategy by selecting specific glass or plastic materials with controlled refractive indices for different lens elements. The first and third lenses use materials with refractive index 1.5-1.6, while the second, fourth, and fifth lenses use materials with refractive index 1.6-1.7. This composite material approach allows optimization of each lens element's contribution to the overall system performance, achieving compact design with good imaging quality.
2Manufacturing precision
If a five-lens structure is adopted to improve imaging quality, then imaging quality is improved, but aperture becomes small which reduces background weakening ability
Solution Approach 1:
The patent applies parameter changes by defining specific focal length relationships and refractive index ranges to optimize the aperture ratio. The aperture ratio is controlled within 1:2.0 or larger, and the focal length ratios between adjacent lenses are precisely defined to maximize light gathering capability while maintaining compact structure. This allows the lens system to achieve both large aperture and good imaging quality simultaneously.
3Volume of moving object
If pixel size is reduced to meet miniaturization requirements, then device miniaturization is achieved, but imaging quality deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length and refractive index parameters of the lens system to work effectively with reduced pixel sizes. The specific focal length relationships and material selections are designed to maintain high imaging quality even when the sensor pixel area is reduced, enabling miniaturization without sacrificing image quality.
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 improved imaging quality, background weakening, and object highlighting with a reduced total track length, suitable for micro camera devices, and is adaptable for low irradiance environments.
Implementation Method 1
an optical component such as an optical filter GF can be arranged between the fifth lens L5 and an imaging surface Si
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: 0.4<f1/f<0.55, −0.8<f2/f<−0.7, 2.0<f3/f<2.3, −1.9<f4/f<−1.7, −1.6<f5/f<−1.2, 0.3<f2/f4<0.45. The optical camera lens provided by the present disclosure can meet the design requirements on low TTL and large aperture, which can effectively weaken the background and highlight the focusing object.