Patent ID: 7697120
Filing Date: 2010-04-13
Classification: G01S,G02B

Abstract:
1. Scanning apparatus for use in a scanning optical system comprising: a source of laser radiation; beam scanning means for directing incident rays of radiation from said laser source to produce a pattern of a scanning beam, first bearing means for rotatably supporting said beam scanning means about a first axis of rotation; second bearing means for rotatably supporting said beam scanning means about a second axis of rotation perpendicular to said first axis of rotation so as to define an intersecting point of said axes of rotation; window means of a transparent material in the shape of a spherical cap so as to define a central axis through the window means, said central axis intersecting said intersecting point; and a correcting arrangement within the path of rays of said beam scanning means for correcting the focal shift that results from said spherical cap window means.