公开(公告)号：US12066686B2

公开(公告)日：2024-08-20

申请号：US17279148

申请日：2019-09-27

Applicant: DENTSPLY SIRONA inc.

Inventor： Markus Berner ,  Martin Seib ,  Fabrizio Confalonieri

IPC: G02B26/08 ,  A61B5/00 ,  G02B7/04 ,  G02B27/64

CPC classification number: G02B7/04 ,  A61B5/0062 ,  A61B5/0088 ,  G02B27/646

Abstract: The present invention relates to an apparatus for varying a focal point of an optical system in a dental 3D-scanner, comprising: a lens unit with a lens 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; a guide unit for guiding a movement of the lens unit between the front reversal position and the rear reversal position along a guide axis being parallel to an optical axis of the lens; and a drive unit for driving the movement of the lens unit, said drive unit including a linear motor with an anchor and a stator, said anchor being movable along a drive axis 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 for scanning a three-dimensional scan object.