公开(公告)号：US20210389549A1

公开(公告)日：2021-12-16

申请号：US17279148

申请日：2019-09-27

Applicant: DENTSPLY SIRONA inc.

Inventor： Markus BERNER ,  Martin SEIB ,  Fabrizio CONFALONIERI

IPC: G02B7/04 ,  G02B27/64 ,  A61B5/00

Abstract: The present invention relates to an apparatus (28) for varying a focal point (24) of an optical system in a dental 3D-scanner (10), comprising: a lens unit (30) with a lens (20) being movable between a front reversal position and a rear reversal position to vary a position of a focal point with respect to a scan object (22): a guide unit (34) for guiding a movement of the lens unit between the front reversal position and the rear reversal position along a guide axis (48) being parallel to an optical axis (46) of the lens; and a drive unit (36) for driving the movement of the lens unit, said drive unit including a linear motor (38) with an anchor (40) and a stator (42), said anchor being movable along a drive axis (44) of the drive unit that is parallel to the guide axis, said stator being affixed to the guide unit. The present invention further relates to a dental 3D-scanner (10) for scanning a three-dimensional scan object.