Liquid lens with gravitational sag correction

A liquid lens includes: a substrate; a transparent elastic film forming a cavity with the substrate; and a transparent fluid filling the cavity between the substrate and the film. In the absence of the fluid in the cavity, the membrane has a pre-twisted, rotationally asymmetric shape. When the cavity is filled with the fluid and the substrate is vertically disposed at a predetermined clock angle with respect to gravity, the membrane employs a substantially rotationally symmetrical shape, reducing the impact of gravitational sag on the optical performance of the liquid lens, as the elasticity of the membrane counteracts the gravity that exerts a downward force on the fluid in the cavity. 一种液体透镜包括：衬底；透明弹性的膜，该膜与该衬底形成腔；以及透明的流体，该流体填充位于该衬底与该膜之间的该腔。在该腔中没有该流体的情况下，该膜具有预扭曲、旋转非对称的形状。当该腔中填充有该流体并且该衬底相对于重力以预定的时钟角竖直地设置时，由于该膜的弹性抵消了对该腔中的该流体施加向下力的重力，该膜采用基本旋转对称的形状，减小了重力垂度对该液体透镜的光学性能的影响。