| 主权项 |
1. A scanner comprising:
a lens assembly comprising a lens having a lens axis; and a positioning system to adjust a focal plane of the lens assembly, the positioning system comprising:
an outer element;an inner element disposed within the outer element, wherein the lens assembly is housed in the inner element; anda linear-motion bearing that couples the inner element to the outer element, the linear-motion bearing providing a single degree of translational movement of the inner element along the lens axis, the linear-motion bearing comprising:
a first element coupling comprising a first inner element region coupled to the inner element, a first outer element region coupled to the outer element, and one or more first flexures that connect the first inner element region to the first outer element region of the first element coupling; anda second element coupling comprising a second inner element region coupled to the inner element, a second outer element region coupled to the outer element, and one or more second flexures that connect the second inner element region to the second outer element region of the second element coupling. |
