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

Claim 16:
17. 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, wherein the internal volume is circumferentially enclosed by the frame structure and is air-tightly sealed with a reference pressure therein and wherein the membrane is tensioned by the frame structure in such a way that a self-supporting region of the membrane extends over 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 opposite the reference measurement electrode;
wherein:
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;
the reference counter-electrode is arranged in the internal volume;
a radial exterior edge of the reference counter-electrode is suspended from the membrane by a first connector that extends, in a direction towards the substrate, from the membrane to the radial exterior edge of the reference counter-electrode, with a remainder of the reference counter-electrode, including a radial majority of the reference counter-electrode, being free from the membrane;
the measurement counter-electrode is arranged in the internal volume; and
at least one of a center of the measurement-counter electrode and a radial exterior part of the measurement-counter electrode is connected to the membrane.