| 摘要 |
<p>An actuating system for liquid-filled variable focus lenses of the type where the focus is adjusted by changing the spacing between a rigid lens 20 and a distensible membrane 22. The actuating system involves a finger-operated positioner 32 which drives an elongated flexible actuating member, i.e., a thin band 31, which is supported in a channel to prevent buckling. The band drives one or more actuators 15 which are located around the periphery of the lens and which provide a mechanical advantage so that the motion of the finger-operated positioner is in a comfortable range. The system is primarily used for spectacles and there may be a hinge opposite a single actuator (Fig 8, not shown).</p> |
