Patent ID: 11940345
Assignee: ROBERT BOSCH GMBH
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 21:
22. A micromechanical component for a capacitive pressure sensor device, the micromechanical component comprising:
a substrate;
a membrane;
a frame structure that frames a partial surface of the substrate and/or of at least one intermediate layer on the substrate, with an internal volume between the membrane and the framed partial surface;
a measurement electrode that is situated on the framed partial surface;
a reference measurement electrode that is situated on the framed partial surface and is electrically insulated from the measurement electrode;
a measurement counter-electrode opposite the measurement electrode; and
a reference counter-electrode that is arranged opposite the reference measurement electrode and that is supported by the framed partial surface via a connector that extends from the reference counter-electrode towards the framed partial surface, with at least part of the reference counter-electrode being between the membrane and the reference measurement electrode;
wherein:
the internal volume is circumferentially enclosed by the frame structure and is air-tightly sealed with a reference pressure therein;
the membrane is tensioned in such a way that a self-supporting region of the membrane extends over the framed partial surface;
the self-supporting region of the membrane is deformable by a physical pressure that is applied on an external side of the self-supporting region, oriented away from the internal volume, when the physical pressure is unequal to the reference pressure; and
the micromechanical component includes at least one of the following features (a)-(b):
(a) the connector extends from a radially interior half of the reference counter-electrode towards the framed partial surface, and an entirety of the reference measurement electrode is positioned radially exterior to the connector; and
(b) the reference measurement electrode includes a radially interior region and a radially exterior region, and the connector extends towards the framed partial surface through an electrically isolated area between the radially interior region of the reference measurement electrode and the radially exterior region of the reference measurement electrode.