Patent ID: 6739193
Filing Date: 2004-05-25
Classification: G01C,G01P

Abstract:
A micromechanical structure for one of an acceleration sensor and a rotational speed sensor, comprising:an anchoring device; a substrate that includes the anchoring device; a flexible spring device; a sacrificial layer; and a centrifugal mass that is connected to the anchoring device via the flexible spring device so that the centrifugal mass is elastically deflectable from a rest position, the centrifugal mass including a clearance and being configured to be deflectable by etching the sacrificial layer underneath the centrifugal mass; wherein the sacrificial layer is arranged in a first area arranged under the centrifugal mass with a first etchable thickness and in a second area arranged under the centrifugal mass with a second etchable thickness, the second thickness is greater than the first thickness, and the centrifugal mass is structurally formed in the first area such that during etching of the sacrificial layer only a maximum of a first etching front and a second etching front come together in order to limit an etching residue deposit.