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

Claim 15:
16. A method for producing a capacitive pressure sensor device, the method comprising:
producing a micromechanical component, the production of the micromechanical component comprising:
forming on a substrate a frame structure that frames a partial surface of the substrate and/or of at least one intermediate layer on the substrate;
tensioning a membrane via the frame structure in such a way that a self-supporting region of the membrane extends over the framed partial surface, with an internal volume between the membrane and the framed partial surface, 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 a reference pressure in the internal volume;
situating a measurement electrode on the framed partial surface;
arranging a measurement counter-electrode in the internal volume;
situating on the framed partial surface a reference measurement electrode that is electrically insulated from the measurement electrode;
providing a first connector; and
providing a reference counter-electrode; and

providing evaluation electronics configured to:
determine, based on input from electrical contacts of a tapped measurement voltage between the measurement electrode and the measurement counter-electrode and a tapped reference voltage between the reference measurement electrode and the reference counter-electrode, a measurement value relating to the physical pressure prevailing on the external side of the self-supporting region; and

output the determined measurement value;
wherein the method includes at least one of the following two features (I) and (II):
(I) (a) the arranging of the measurement counter-electrode includes attaching the measurement counter electrode to at least one second connector that protrudes from a radially interior region of the membrane towards the framed partial surface, (b) the first connector protrudes from a radially exterior region of the membrane towards the substrate, (c) the providing of the reference counter-electrode includes connecting the reference counter-electrode to the membrane by attachment of a radially exterior half of the reference counter-electrode to the first connector, with a radially interior half of the reference counter-electrode being free from the membrane; and
(II) (a) the measurement counter electrode is arranged opposite the measurement electrode, (b) the reference counter-electrode is arranged opposite the reference measurement electrode and in the internal volume, (c) the first connector extends, in a direction towards the substrate, from the membrane to a radial exterior edge of the reference counter-electrode, (d) the radial exterior edge of the reference counter-electrode is suspended from the membrane by the first connector, with a remainder of the reference counter-electrode, including a radial majority of the reference counter-electrode, being free from the membrane, and (e) 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.