| 摘要 |
A system for switching a focus position comprises a plurality of active focus-switch devices capable of changing a focal length for several times, a plurality of objects to be focused, a plurality of incident light beams passing through the active focus-switch devices and then being focused on the objects to be focused, and at least one external power supply electrically connected to the active focus-switch devices, wherein the external power supply is electrically conducted or not conducted to the active focus-switch devices, and the plural incident light beams are focused on the objects to be focused by the active focus-switch devices, or the plural incident light beams passing through the active focus-switch device are projected to the outside in form of a plurality of exit light beams parallel to the plural incident light beams.
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