Wide-Angle Macro Optical System with Stationary Front and Dual Focus Units
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Solution Overview
Problem
Existing wide-angle optical systems for macro imaging face challenges in achieving a balance between reducing size, maintaining high optical performance, and supporting autofocus and image stabilization while effectively correcting various aberrations during focusing from infinity to close-range macro imaging.
Innovation Solution
An optical system design featuring a front lens unit with two or more negative lenses, where the first and second focus lens units move during focusing, while the front lens unit remains stationary, adhering to specific focal length and distance relationships to ensure high optical performance, compact size, and support autofocus and image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the front lens unit is made movable for focusing, then focusing capability is improved, but the structural complexity and difficulty of correcting aberrations increase
Solution Approach 1:
The optical system is divided into three distinct lens units: a stationary front lens unit with negative lenses, and two movable focus lens units. This segmentation allows the front lens unit to be optimized for wide-angle performance and aberration correction while the focus lens units handle the focusing function, reducing overall structural complexity compared to a fully movable system.
Solution Approach 2:
Instead of making the front lens unit movable for focusing (conventional approach), this invention makes the front lens unit stationary and moves the focus lens units located behind it. This inverted approach simplifies the front lens structure, improves aberration correction, and maintains effective focusing capability through the alternative configuration.
2Volume of moving object
If the optical system is designed for compact size, then portability is improved, but the ability to correct aberrations across the focusing range deteriorates
Solution Approach 1:
Each lens unit is designed with specific local optical properties: the front lens unit uses negative lenses optimized for wide-angle field control, while the focus lens units contain positive and negative lenses arranged to correct specific aberrations at different focusing distances. This localized optimization allows compact dimensions while maintaining aberration correction across the entire focusing range from infinity to macro.
Solution Approach 2:
The optical system employs composite lens designs within each unit, combining multiple lens elements with different refractive indices and optical powers. The front lens unit combines negative lenses, while the focus units combine positive and negative lenses, creating a composite structure that achieves superior aberration correction in a compact form factor.
3Productivity
If multiple lens units are made movable for autofocus, then autofocus performance is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The focusing function is segmented across two separate movable lens units rather than requiring the entire optical system to move. This segmentation allows independent optimization of each unit's manufacturing requirements and enables more straightforward autofocus mechanism design compared to moving all lens elements.
Solution Approach 2:
The focus lens units serve multiple functions: they provide autofocus capability through movement, correct spherical and chromatic aberrations, and enable macro imaging. This multi-functionality reduces the need for additional specialized components, simplifying manufacturing while maintaining high autofocus performance.
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 system achieves wide-angle macro imaging with high optical performance, compact size, and effective autofocus and image stabilization, correcting spherical and chromatic aberrations across the focusing range.
Implementation Method 1
An optical system includes a front lens unit, a first focus lens unit disposed on an image side of the front lens unit, and a second focus lens unit disposed on an image side of the first focus lens unit. A distance between adjacent lens units changes during focusing.
Data Source
AI summary
An optical system includes a front lens unit, a first focus lens unit disposed on an image side of the front lens unit, and a second focus lens unit disposed on the image side of the first focus lens unit. A distance between adjacent lens units changes during focusing. The front lens unit includes two or more negative lenses. For focusing, the front lens unit does not move, but the first focus lens unit and the second focus lens unit move. The optical system can provide focusing from an in-focus state on an object at infinity to an in-focus state in which lateral magnification β of the optical system is −1.0 or less. A predetermined inequality is satisfied.