This case study presents an in-depth analysis of the optimization process for optical system design, specifically focusing on fixed-focus lenses. The study highlights the improvements made in lens design and material selection to enhance performance and manufacturability.
Enhancing Fixed-Focus Lenses
- The Double Gaussian Structure:
The double Gaussian structure is a popular design for fixed-focus lenses, characterized by its simplicity and high technical precision. Typically composed of six elements with meniscus lenses at the front and back, this nearly symmetrical structure effectively corrects aberrations such as coma, distortion, magnification, and chromatic difference of magnification. Despite its age, this design remains relevant due to its reliability and efficiency.
- Design Refinement:
In the provided double Gaussian variant design, the first and fifth lenses are positive lenses with thin edges, which are prone to breakage during processing. The first lens has a diameter of 78mm and requires an edge thickness greater than 2.5mm, while the fifth lens, with a diameter of 48mm, needs an edge thickness over 2.2mm. The current design’s edge thicknesses fall short of these values, posing production risks. Expanding the outer diameters of these lenses is necessary to mitigate these risks and facilitate processing.
To read the entire case study, visit Shanghai Optics' website.