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17 June 2021 Design of a miniature anamorphic lens with a freeform front group and an aspheric rear group
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Abstract

We propose a miniature anamorphic lens design that records wide-screen videos on an ordinary CMOS format. The front group consists of two freeform lenses, which achieve different focal lengths in the two orthogonal directions and thus enable the anamorphic characteristics. The rear group is made of rotationally symmetric aspheric elements that relay the image on the sensor. The annularly stitched extreme-point-based polynomial surface description is proposed to control the extreme point position and the air clearance between elements in the optimization process. An optimization method based on surface upgrade and conversion is adopted in the design. The design result offers an anamorphic ratio of 1.33 and an f-number (f  /  #) of ∼2, with a field of view of 65.3 deg  ×   35 deg. The overall length of the lens is 9.5 mm, which shows an advantage for integration into pocket devices.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
Chen Xu, Weitao Song, and Yongtian Wang "Design of a miniature anamorphic lens with a freeform front group and an aspheric rear group," Optical Engineering 60(6), 065104 (17 June 2021). https://doi.org/10.1117/1.OE.60.6.065104
Received: 16 March 2021; Accepted: 25 May 2021; Published: 17 June 2021
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CITATIONS
Cited by 4 scholarly publications.
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KEYWORDS
Aspheric lenses

Distortion

Chemical elements

Modulation transfer functions

Lens design

Optical engineering

Image sensors

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