Optical System with Multi-Unit Focusing for Compact Long-Focal-Length Imaging
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Solution Overview
Problem
Existing imaging optical systems with long focal lengths face challenges in achieving high-speed and highly accurate focusing while maintaining a reduced size and weight, and suppressing aberrations such as spherical aberration and coma, particularly during close-range imaging.
Innovation Solution
An optical system configuration with a front lens unit having positive refractive power and a rear lens unit that does not move during focusing, combined with an intermediate group comprising two or more focus lens units that move independently for focusing, adhering to specific inequalities to optimize focus sensitivity and refractive power relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single focus lens unit is used for focusing, then the device complexity is reduced, but the focusing speed and accuracy deteriorate
Solution Approach 1:
The focus lens unit is divided into multiple independent focus lens units (first focus lens unit and second focus lens unit) that move along different loci. Each focus lens unit has its own driving mechanism, allowing independent control and movement. This segmentation enables more precise focusing control and higher focusing speed while maintaining manageable device complexity through modular design.
2Measurement precision
If multiple lens units move during focusing, then the focusing accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamic focusing by allowing different focus lens units to move along different loci during focusing operations. The first focus lens unit moves along a first locus while the second focus lens unit moves along a second locus, enabling flexible and adaptive focusing control that improves accuracy without requiring overly complex mechanical structures.
3Adaptability or versatility
If the optical system is designed for long focal length, then the imaging capability is improved, but the size and weight of the optical system increase
Solution Approach 1:
The optical system is segmented into distinct functional groups: a front lens unit with positive refractive power, an intermediate group containing multiple focus lens units, and a rear lens unit. This segmentation allows for optimized distribution of optical elements, enabling long focal length imaging capability while controlling the overall size and weight through efficient spatial arrangement of each segment.
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
This configuration enables high-speed and accurate focusing with reduced size and weight, while effectively suppressing aberrations, particularly spherical aberration and coma, even at close distances.
Implementation Method 1
an optical system includes, in order from an object side to an image side, a front lens unit having positive refractive power, an intermediate group, and a rear lens unit
Data Source
AI summary
An optical system includes, in order from an object side to an image side, a front lens unit having positive refractive power, an intermediate group, and a rear lens unit. A distance between adjacent lens units changes during focusing. The front lens unit includes a maximum air gap in the optical system. The front lens unit and the rear lens unit do not move for focusing. The intermediate group includes two or more focus lens units that move in different loci for focusing. Predetermined inequalities are satisfied.