| 摘要 |
A variable focus lens (10) comprises a container having an interior chamber (16). An optical axis (24) extends through the chamber. A first fluid medium (18) and a second fluid medium (20) are disposed in the chamber. A meniscus (22) is arranged substantially perpendicular to the optical axis and between the first medium and the second medium in said chamber. The variable focus lens further comprises a meniscus control system for controlling a shape of the meniscus. The meniscus control system comprises a first control element (26) and a second control element (28, 30). The first control element is coupled to the meniscus and is moveable in a direction substantially parallel to the optical axis. The first control element and the second control element are configured to interact using an electric field or a magnetic field, thereby using proven and reliable techniques. Further, the interior chamber may be a closed chamber without any elements extending through the wall of the chamber. Hence, a chance of leakage of the fluid media from the chamber is reduced.
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