Multi-Group Zoom Optical System for Compact Imaging
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Solution Overview
Problem
Existing optical systems for electronic devices face challenges in achieving high pixels, large zoom range, and miniaturization simultaneously, leading to increased cost, size, and weight, as well as difficulties in aberration correction and imaging quality.
Innovation Solution
An optical system comprising a first lens group with positive refractive power, a second lens group with negative refractive power, and a third lens group with positive refractive power, where the distances between these groups are adjustable, allowing the system to operate at telephoto, intermediate, and wide-angle ends, with specific ratios of focal lengths and air spaces to optimize zoom range and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple lenses are used to achieve high pixels and large zoom range, then imaging quality and zoom capability are improved, but device cost, size, and weight increase
Solution Approach 1:
The optical system is divided into three distinct lens groups (first, second, and third lens groups) with different refractive power configurations. Each group serves specific optical functions: the first group provides positive refractive power for convergence, the second group provides negative refractive power for divergence and aberration correction, and the third group provides positive refractive power for final focusing. This segmentation allows the system to achieve high imaging quality and large zoom range while controlling the overall complexity through functional specialization of each group.
2Measurement precision
If more lenses are added to achieve high pixels, then imaging quality is improved, but device thickness and weight increase
Solution Approach 1:
The optical system employs adjustable distances between the first, second, and third lens groups, enabling dynamic reconfiguration of the optical path. This dynamic adjustment allows the system to achieve different focal lengths and zoom ratios without adding fixed structural thickness. By optimizing the air spaces and relative positions of lens groups, the system maintains high pixel quality while minimizing the overall device thickness compared to static multi-lens configurations.
3Adaptability or versatility
If lens configuration is increased to achieve large zoom range, then shooting magnification range is improved, but device cost and manufacturing difficulty increase
Solution Approach 1:
The system achieves large zoom range by changing the focal length parameter through adjustable distances between lens groups rather than through complex lens element designs. By varying the spacing parameters (air spaces) between the three lens groups, the system can transition between wide-angle, standard, and telephoto modes. This parameter-based approach simplifies manufacturing compared to designing and fabricating multiple specialized lens elements, reducing both cost and manufacturing difficulty while maintaining adaptability across different shooting scenarios.
4Measurement precision
If multiple lens groups are used to achieve high pixels and miniaturization, then imaging quality is improved, but aberration correction difficulty increases
Solution Approach 1:
Each lens group is designed with specific local optical properties: the first lens group with positive refractive power for light convergence, the second lens group with negative refractive power for aberration correction and light divergence, and the third lens group with positive refractive power for final image focusing. This local quality differentiation allows each group to address specific optical requirements, with the second group specifically optimized for correcting aberrations introduced by the first and third groups. The coordinated design of these locally optimized groups achieves high imaging quality while managing aberration correction more effectively than a single complex lens group.
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 optical system achieves high pixels, large zoom range, and miniaturization while improving imaging quality by balancing aberration correction and reducing the overall length, ensuring sufficient luminous flux and high-definition imaging across different zoom settings.
Implementation Method 1
a first lens group having a positive refractive power
Implementation Method 2
a second lens group having a negative refractive power
Implementation Method 3
a third lens group having a positive refractive power
Data Source
AI summary
An optical system, a camera module, and an electronic device are provided. The optical system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power which are sequentially arranged from an object side to an image side along an optical axis of the optical system. The first lens group includes a first lens. The second lens group includes a second lens, a third lens, and a fourth lens. The third lens group includes a fifth lens, a sixth lens, a seventh lens, and an eighth lens. A distance between any two groups of the first lens group, the second lens group, and the third lens group is adjustable such that the optical system is operable to be at a telephoto end, an intermediate, and a wide-angle end.