| 摘要 |
<p>The invention relates to deflecting a light beam by means of a rotating polygonal mirror unit having a rotor means (41), with each mirror (40) of said unit being individually adjustable. Each mirror (40) along a first edge thereof is mounted in a respective receiving groove (51) on said rotor means (41), said groove (51) having its axis located transverse to the axis of rotation of said rotor means, and each of said mirrors (40), along a second edge thereof parallel to said first edge, is adjustably attached to said rotor means by means of a spring element (54-56) in the form of a metal plate, said spring element being adjustable by means of a screw/nut connection (57) which is attached to said rotor means (41) at one end and at the other end engages said spring element, said spring element having its bending curvature changed upon adjustment of said screw/nut connection to cause said mirror to be moved correspondingly in a direction towards or away from a mid point of said polygonal mirror unit (32). The invention is particularly, but not exclusively, useful in an apparatus for measuring distance to at least one part of an object (1) for determining at least one dimension of the object. <IMAGE></p> |
