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[Editor's Pick] Current Optics and Photonics Vol. 6 no. 1 (2022 February)

사무국 hit 1239 date 2022-02-28

Design of an 8× Four-group Zoom System without a Moving Group by Considering the Overall Length

Sung Min Park, Jea-Woo Lee, and Sung-Chan Park*

 

Current Optics and Photonics  Vol. 6 No.1 (2022 February) pp. 104-113
DOI: https://doi.org/10.3807/COPP.2022.6.1.104

 

Fig. 1(a) Paraxial ray traces in an equivalent optical system: (a) Ray tracing in the forward direction, (b) ray tracing in the reverse direction.Fig. 1(b) Paraxial ray traces in an equivalent optical system: (a) Ray tracing in the forward direction, (b) ray tracing in the reverse direction.

 

(a)                                                                                               (b)

 

  Fig. 1  Paraxial ray traces in an equivalent optical system: (a) Ray tracing in the forward direction, (b) ray tracing in the reverse direction.

 

 

Keywords: Aberrations, First orders, Tunable polymer lens, Zoom lens, Zoom position
OCIS codes: (080.2740) Geometric optical design; (120.4570) Optical design of instruments; (220.3620) Lens system design


Abstract
We present a method to count the overall length of the zoom system in an initial design stage. In a zoom-lens design using the concept of the group, it has been very hard to precisely estimate the overall length at all zoom positions through the previous paraxial studies. To solve this difficulty, we introduce T eq as a measure of the total track length in an equivalent zoom system, which can be found from the first-order parameters obtained by solving the zoom equations. Among many solutions, the parameters that provide the smallest T eq are selected to construct a compact initial zoom system. Also, to obtain an 8× four-group zoom system without moving groups, tunable polymer lenses (TPLs) have been introduced as a variator and a compensator. The final designed zoom lens has a short overall length of 29.99 mm, even over a wide focal-length range of 4‒31 mm, and an f-number of F/3.5 at wide to F/4.5 at tele position, respectively.

 

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Editors Pick_Feb 2022_COPP 2021-257.pdf