| 摘要 |
A multi-position focusing apparatus having a plurality of pads mounted about a centerline receiving ray reflecting members or energy emitting devices thereon, whereby the pads are focused along the centerline on a desired point in space to concentrate all of the energy on the selected point and when once focused, upon operating the apparatus at substantially all positions of the pads, the focal point of the pads will lie in a common point along the centerline.
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