Patent ID: 7221494

Claim:
An optical scanning device for use in performing refractive eye surgery on a patient, characterised in that the device comprises: a platform, a mirror provided on said platform to reflect an optical beam incident on said mirror, a pivot about which said platform is able to pivot, at least first piezoelectric actuator means to act on said platform to pivot said platform about said pivot in a first direction, at least first resilient means to bias said platform about said pivot in a second direction opposed to said first direction, drive means to apply a quasi random voltage to said first piezoelectric actuator means to drive said first piezoelectric actuator means, wherein said first piezoelectric actuator means acts on said platform at a location in proximity to said pivot, to pivot said platform such that the angle at which said beam is reflected by said mirror is altered to alter the path of the reflected beam to thereby scan the reflected beam in a quasi random fashion in a first plane over a surface.