Optical system design of 2D/3D continuous zoom objective lens

Zhijie Ma; Jun Zhang; Mengyuan Xie; Xiaolian Lu; Meizhong Liao

doi:10.1117/12.3008251

24 November 2023 Optical system design of 2D/3D continuous zoom objective lens

Zhijie Ma, Jun Zhang, Mengyuan Xie, Xiaolian Lu, Meizhong Liao

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 1293556 (2023) https://doi.org/10.1117/12.3008251
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

Traditional continuous zoom microscopes are limited to two-dimensional observation, whereas the 2D/3D continuous zoom microscope not only enables continuous zooming in a two-dimensional plane but also allows for switching to three-dimensional observation mode, providing additional information about the side view of the specimen. This paper presents the design of a 2D/3D continuous zoom objective lens based on zoom system theory. Using negative group zoom and negative group compensation method, the system was designed using Zemax software. It consists of four groups: front fixed group, zoom group, compensation group, and rear fixed group, forming a mechanical compensation-based continuous zoom objective lens optical system. A catadioptric structure was incorporated to enable three-dimensional stereoscopic observation. This paper introduces initially a four-element continuous zoom objective lens with magnification ranging from 0.7× to 4.5× and a numerical aperture between 0.025 to 0.09. This lens possesses a working distance of 90mm and a conjugate distance of 324mm. Subsequently, building upon this continuous zoom objective lens, a three-dimensional observer was introduced, transforming it into a switchable 2D/3D continuous zoom objective lens. The working distance is 70mm, and the magnification varies from 0.4× to 2.5×. Design results demonstrate that, whether in the 2D or 3D mode, this system can be aligned with a 1/2-inch sensor. Across different observation modes, the MTF curves for various magnification closely approach the diffraction limit, and the spot diagram remain smaller than the Airy disk, showing good imaging quality, expanding the application scenarios of continuous zoom objective lens.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Zhijie Ma, Jun Zhang, Mengyuan Xie, Xiaolian Lu, and Meizhong Liao "Optical system design of 2D/3D continuous zoom objective lens", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 1293556 (24 November 2023); https://doi.org/10.1117/12.3008251

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KEYWORDS

Zoom lenses

Objectives

Design and modelling

Modulation transfer functions

Microscopes

Cameras

Optical components

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