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.

中文翻译：

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具有自由曲面前组和非球面后组的微型变形镜头的设计

我们提出了一种微型变形镜头设计，可在普通 CMOS 格式上录制宽屏视频。前组由两个自由曲面镜头组成，在两个正交方向上实现不同的焦距，从而实现变形特性。后组由旋转对称的非球面元件组成，这些元件将图像传递到传感器上。提出了基于环形缝合极值点的多项式曲面描述来控制优化过程中的极值点位置和元素之间的空气间隙。设计中采用了基于表面升级和转换的优化方法。设计结果提供了 1.33 的变形比和约 2 的 f 数 (f / #)，视野为 65.3 度 × 35 度。镜头全长9.5mm，