Wide-Angle Zoom Lens Distortion Control via Intermediate Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wide-angle zoom lenses face challenges in reducing manufacturing costs and minimizing distortion, while also requiring complex aspherical lens designs that increase production costs and complexity.
Innovation Solution
The optical system incorporates a magnification optical system and a relay optical system with specific lens configurations, including aspherical lenses, to achieve an intermediate imaging position that reduces distortion and allows for smaller, fewer aspherical lenses, thereby lowering manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex aspherical lens designs are used to minimize distortion, then image quality is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length ratio (|f2/fw|) to be greater than 23, where f2 is the focal length of the second lens element and fw is the focal length at the wide-angle end. This parameter optimization allows the system to achieve effective distortion control while using simpler, fewer aspherical lenses, thereby reducing manufacturing complexity and cost while maintaining image quality.
2Ease of manufacture
If fewer and smaller aspherical lenses are used, then manufacturing cost is reduced, but distortion control becomes more difficult
Solution Approach 1:
The patent changes the optical parameters by establishing a specific focal length relationship (|f2/fw| > 23) that enables effective distortion control with reduced aspherical lens complexity. This parameter optimization allows the system to achieve the desired distortion control performance while minimizing the number and size of aspherical lenses required.
Solution Approach 2:
The patent introduces an intermediate imaging position between the magnification optical system and the relay optical system. This intermediate position acts as a mediator that allows distortion control to be achieved through the overall system configuration rather than relying solely on complex aspherical lens designs, thereby reducing the burden on individual lens elements.
3Manufacturing precision
If an intermediate imaging position is introduced, then distortion is reduced and aspherical lens requirements are minimized, but system complexity increases
Solution Approach 1:
The patent introduces an intermediate imaging position that acts as a mediator between the object and final image planes. This intermediate position enables distortion control by allowing the magnification optical system and relay optical system to work together with optimized parameters, achieving the desired image quality while managing system complexity through parameter optimization (|f2/fw| > 23).
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 effectively reduces distortion and minimizes the number and size of aspherical lenses, leading to a more cost-effective and efficient wide-angle zoom lens design with improved image quality.
Implementation Method 1
a first aspherical lens arranged in the front group; a second aspherical lens arranged in the rear group; and a third aspherical lens arranged in the relay optical system
Data Source
AI summary
An optical system internally has an intermediate imaging position that is conjugated to a magnification conjugate point on a magnification side and a reduction conjugate point on a reduction side, respectively. The optical system includes a magnification optical system having a first lens element and a second lens element positioned on the magnification side with respect to the intermediate imaging position; and a relay optical system having a plurality of lens elements, positioned on the reduction side with respect to the intermediate imaging position. The first lens element and the second lens element are positioned in this order from the magnification side, and the second lens element has a positive power. The optical system satisfies: 23<|f2/fw|<1000, wherein f2 is a focal length of the second lens element, and fw is a focal length of an entirety of the optical system at a wide-angle end.