Single-Focus Optical System Aberration Correction
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Solution Overview
Problem
Conventional optical systems, such as Gaussian, Sonnar, and Ernostar types, face limitations in achieving high imaging performance with wide angles of view greater than 50 degrees due to difficulties in correcting spherical aberration and coma, and are often large in size or have short back focus, making them unsuitable for applications requiring both high resolution and compactness.
Innovation Solution
A single-focus optical system is designed with a specific configuration including multiple negative lenses and positive lenses, where the first lens unit has a reduction-side negative lens closest to the reduction side and includes at least three negative lenses, and the second lens unit has a front sub-unit with only positive lenses and a rear sub-unit with negative lenses, allowing for effective aberration correction, including spherical aberration, coma, and chromatic aberrations, while enabling inner focusing for high-speed and small aberration fluctuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Gaussian type optical system is used, then aberration correction is favorable, but angle of view is limited to slightly less than 50 degrees
Solution Approach 1:
The optical system is divided into multiple lens units with specific functions: a first lens unit with positive refractive power containing multiple negative and positive lenses for aberration correction, and a second lens unit with positive refractive power for achieving wide angle of view. This segmentation allows each unit to optimize for its specific function while working together to achieve both wide angle of view and good aberration correction.
Solution Approach 2:
The patent applies specific parameter ranges to achieve the desired performance: the first lens unit has positive refractive power with a specific focal length ratio, the second lens unit has positive refractive power with controlled dispersion, and individual lenses have specific curvature and refractive index ranges. These parameter optimizations enable simultaneous achievement of wide angle of view (50 degrees or more) and effective aberration correction.
2Manufacturing precision
If Gaussian type optical system is used, then imaging performance is high, but system size becomes large
Solution Approach 1:
The patent extracts and concentrates the aberration correction function into the first lens unit, which contains multiple negative and positive lenses specifically arranged for this purpose. The second lens unit is designed with positive refractive power to achieve wide angle of view without adding excessive length. This functional extraction allows compact overall design while maintaining high imaging performance.
Solution Approach 2:
Specific parameter constraints are applied to control system size: the ratio of focal lengths, the refractive powers of individual lenses, and the dispersion characteristics are all optimized within specific ranges. These parameter optimizations enable the system to achieve high imaging performance in a compact form factor.
3Length of moving object
If Sonnar or Ernostar type optical system is used, then back focus is short, but angle of view cannot be widened easily
Solution Approach 1:
The optical system is segmented into two functional units: the first lens unit handles aberration correction with its multiple negative and positive lenses, while the second lens unit with positive refractive power is specifically designed to achieve wide angle of view. This segmentation allows the system to maintain short back focus while achieving 50 degrees or more angle of view, overcoming the limitation of conventional Sonnar and Ernostar types.
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 superior imaging performance with an F-number smaller than 1.4 and an angle of view greater than 50 degrees, providing balanced aberration correction and allowing for compact and lightweight lens movement, thus overcoming the limitations of conventional systems.
Implementation Method 1
a first lens unit, and a second lens unit having a positive refractive power... the first lens unit includes a reduction-side negative lens component closest to the reduction side, and in addition, the first lens unit includes not less than three negative lens components
Data Source
AI summary
A single-focus optical system includes in order from an enlargement side, a first lens unit, and a second lens unit having a positive refractive power. A lens component is one of a single lens and a cemented lens. The first lens unit includes a reduction-side negative lens component closest to the reduction side, and in addition, the first lens unit includes not less than three negative lens components including the reduction-side negative lens component. The second lens unit includes in order from the enlargement side, a front side sub-unit and a rear side sub-unit. The front side sub-unit includes only a positive lens component, and the rear side sub-unit includes at least a negative lens.