Compact Lens System with Movable Unit for Spherical Aberration Control
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Solution Overview
Problem
Existing lens systems face challenges in achieving a compact and simple structure while providing a soft focus effect and modifying spherical aberrations, often resulting in increased size or complexity due to the need for multiple moving lens units and variations in focal length.
Innovation Solution
A spherical aberration-variable optical system with a negative refractive power, comprising a first positive lens unit, a second movable lens unit, and a third negative lens unit, where the second lens unit moves along the optical axis to adjust spherical aberration, maintaining a compact structure by aligning the principal points closer to the object and using specific refractive power and Abbe number conditions to control aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple lens units are independently moved to achieve soft focus effect, then the soft focus effect is obtained, but the structure size and complexity increase
Solution Approach 1:
The patent combines the soft focus function and spherical aberration correction function into a single movable lens unit (the second lens unit). By merging these functions, the system achieves soft focus effect without requiring multiple independently moving lens units, thus reducing structural complexity while maintaining the desired optical effects
Solution Approach 2:
The second lens unit is designed to serve multiple purposes: it provides the soft focus effect through its movement and simultaneously corrects spherical aberration. This multi-functional design eliminates the need for separate dedicated components for each function, thereby simplifying the overall structure
2Reliability
If attachment lens apparatus is added to modify spherical aberration, then spherical aberration correction is achieved, but the combined focal length varies from the original lens apparatus
Solution Approach 1:
The spherical aberration correction function is merged into the existing lens system architecture by making the second lens unit movable along the optical axis. This integration ensures that the correction mechanism becomes part of the unified optical system, maintaining consistent focal length characteristics rather than introducing variations that would occur with separate attachment devices
Solution Approach 2:
The patent employs dynamic adjustment of the second lens unit position to correct spherical aberration while maintaining focal length consistency. The movable design allows real-time optimization of optical performance without changing the fundamental focal length of the combined system, resolving the contradiction between correction effectiveness and focal length stability
3Reliability
If lens unit for correcting spherical aberration is added, then spherical aberration correction is achieved, but the structure size and complexity increase
Solution Approach 1:
The second lens unit is designed as a multi-functional component that simultaneously provides soft focus effect and spherical aberration correction. By making this single lens unit movable, the system achieves both optical corrections without adding separate dedicated components, thereby avoiding increased structural complexity
Solution Approach 2:
The patent achieves spherical aberration correction by changing the position parameter of the second lens unit along the optical axis. This parameter-based adjustment method allows for effective aberration correction without adding complex mechanical structures, as the correction is achieved through simple translational movement of an existing lens unit
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 solution allows for a small and simple lens structure that effectively varies spherical aberration, achieving sharpness and bokeh effects different from the image pickup system alone, while maintaining a consistent focal length and back focus, thus addressing the complexity and size issues of previous systems.
Implementation Method 1
The second lens unit is configured to move in a direction of an optical axis to change a spherical aberration
Implementation Method 2
A lens system of the disclosure is a lens system which is disposed on the image side of an image pickup optical system and has a negative refractive power
Data Source
AI summary
A lens system is disposed on the image side of an image pickup optical system and has a negative refractive power. The lens system includes, in order from an object side to the image side, a first lens unit having a positive refractive power, a second lens unit, and a third lens unit. The first lens unit consists of a single lens or a cemented lens. The second lens unit is configured to move in a direction of an optical axis to change a spherical aberration. A lateral magnification of the lens system and a lateral magnification of the second lens unit in a case where an axial ray is incident on the image pickup optical system are appropriately set.