Patent ID: 9068899
Filing Date: 2015-06-30
Classification: G01L

Abstract:
1. A pressure sensor, comprising: a first electrode plate, a second electrode plate, a third electrode plate, a fourth electrode plate and a fifth electrode plate, which are successively laminated on a substrate comprising a control and reading circuit, wherein the first electrode plate, the third electrode plate and the fourth electrode plate are fixed to the substrate, the first electrode plate and the second electrode plate are disposed opposite to each other and have a gap formed therebetween, the second electrode plate is suspended over the first electrode plate to constitute a first capacitor; the second electrode plate and the third electrode plate are disposed opposite to each other and have a gap formed therebetween, which constitute a second capacitor; and the fourth electrode plate and the fifth electrode plate are disposed opposite to each other and have a gap formed therebetween, the fifth electrode plate is suspended over the fourth electrode plate to constitute a third capacitor, and the fifth electrode plate can move along a direction perpendicular to the substrate; and a first sealing ring, a second sealing ring and a third sealing ring, wherein the first sealing ring is disposed on the substrate, the second sealing ring is disposed around a periphery of the second electrode plate, an edge of the third electrode plate is lapped on the second sealing ring, and the third sealing ring is disposed between the fourth electrode plate and the fifth electrode plate and around a periphery of the fourth electrode plate, wherein the first electrode plate, the third electrode plate, the fourth electrode plate, the fifth electrode plate, the first sealing ring, the second sealing ring and the third sealing ring constitute a single continuous cavity, collectively.