Diffraction Lens Layout for Flare-Controlled Zoom Optics
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Solution Overview
Problem
Existing optical systems face challenges in achieving a balance between maximizing the achromatic effect of diffraction surfaces while minimizing flare and maintaining high contrast, particularly when strong light is incident on these surfaces, leading to reduced screen contrast.
Innovation Solution
The optical system is designed with specific conditional expressions that define the positioning and configuration of lens groups, including a diffraction lens, to optimize the placement of the diffraction surface, ensuring it is disposed at an appropriate distance relative to other lens elements, thereby controlling flare and enhancing aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the diffraction surface is disposed as close to the front side as possible to maximize achromatic effect, then the total length and weight of the optical system can be reduced, but strong light incident on the diffraction surface causes flare and decreases screen contrast
Solution Approach 1:
The patent applies local quality by assigning different functional zones to different parts of the optical system. The diffraction surface is positioned in a specific local region (front lens group at a controlled distance from the object side) where it can exert its achromatic effect on specific wavelengths of light, while other regions (rear lens group) handle contrast preservation. This localized functional assignment resolves the contradiction by allowing the diffraction surface to be close enough for achromatic correction without being so close that it causes excessive flare.
Solution Approach 2:
The patent uses parameter changes by precisely controlling the positional parameter of the diffraction surface relative to the total optical system length. By defining the distance as a specific proportion (0.05 < TLpf/TLt < 0.40) of the total length, the invention optimizes the balance between achromatic effect (which improves with closer placement) and flare reduction (which improves with farther placement). This quantitative parameter control resolves the contradiction through mathematical optimization.
2Manufacturing precision
If the diffraction surface is disposed closer to the front side to reduce optical system length, then chromatic aberration correction is improved, but the risk of flare increases when strong light is incident
Solution Approach 1:
The patent applies parameter changes by establishing a quantitative relationship between the diffraction surface position and the total optical system length. The conditional expression 0.05 < TLpf/TLt < 0.40 defines an optimal parameter range that simultaneously achieves adequate chromatic aberration correction and minimizes flare risk. This parameter-based approach resolves the contradiction by finding the mathematical optimum between two opposing requirements.
Solution Approach 2:
The patent applies dynamics by making the diffraction surface position adaptable to different optical system configurations. Rather than fixing the absolute distance, the position is defined as a dynamic proportion (5-40% of total length) that can adjust according to the specific optical system design. This dynamic positioning allows chromatic aberration correction to be maintained across different system sizes while adapting the flare control characteristics to each configuration.
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 allows for a compact optical system with improved aberration correction, particularly chromatic aberration, while maintaining high contrast and reducing the risk of flare, thus achieving both size reduction and enhanced optical performance.
Implementation Method 1
an achromatic effect is obtained by providing a diffraction surface in an optical system
Data Source
AI summary
An optical system having high optical performance, an optical apparatus including the optical system, and a method for manufacturing the optical system are provided. An optical system used for an optical apparatus such as a camera includes a front lens group including a diffraction lens having a diffraction surface, and a rear lens group disposed on an image side of the front lens group. The optical system is configured so that an interval between the lens groups changes at magnification change. The optical system is also configured so that a condition expressed by a predetermined conditional expression is satisfied.