In this paper, we proposed an ultra slim optical zoom system with Alvarez freeform lenses. A 3X optical zoom system with two pairs of Alvarez lenses was developed. Alvarez lenses are fabricated by precise injection molding and the movable elements are actuated by voice coil motors. A slim camera module was fabricated with a size of 25 mm(width)×25 mm(length)×6 mm(height). The zooming and imaging capabilities of this Alvarez zoom system are demonstrated experimentally. The prototype exhibits a promising future for space-constrained application such as mobile phone camera module, wearable imaging system and endoscopic system.

中文翻译：

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使用 Alvarez Freeform 镜头的超薄光学变焦系统

在本文中，我们提出了一种带有 Alvarez 自由曲面镜头的超薄光学变焦系统。开发了具有两对 Alvarez 镜头的 3 倍光学变焦系统。Alvarez 透镜通过精密注塑成型制造，可移动元件由音圈电机驱动。制造尺寸为25 mm（宽）×25 mm（长）×6 mm（高）的超薄相机模块。实验证明了这种 Alvarez 变焦系统的变焦和成像能力。该原型展示了手机摄像头模块、可穿戴成像系统和内窥镜系统等空间受限应用的广阔前景。