Patent ID: 9073745
Filing Date: 2015-07-07
Classification: B81B,B81C,G01L

Abstract:
1. A Micro Electromechanical System (MEMS) pressure sensor comprising: a first substrate provided with a sensitive diaphragm of a capacitive pressure sensing unit, an electrical connecting layer and a first bonding layer on a surface of the first substrate; and a second substrate provided with an inter-conductor dielectric layer, a conductor connecting layer in the inter-conductor dielectric layer and/or a second bonding layer on a surface of the second substrate; wherein the second substrate is arranged opposite to the first substrate, and the second substrate is fixedly coupled to the first substrate via the first bonding layer and the second bonding layer; a pattern of the first bonding layer is corresponding to a pattern of the second bonding layer, and both the first bonding layer and the second bonding layer are formed of a conductive material; wherein the capacitive pressure sensing unit comprises the sensitive diaphragm and a reference pressure cavity; the reference pressure cavity is disposed between the sensitive diaphragm and the second substrate and the reference pressure cavity is a single cavity surrounded by a wall, wherein the wall comprises at least one element selected from a group consisting of the first bonding layer and the second bonding layer.