Patent ID: 9725301
Date: 2017-08-08
CPC Classifications: B81B,B81C

Claim:
1. A micro-electro mechanical system (MEMS) device, comprising: a cap substrate; a MEMS substrate bonded with the cap substrate, wherein the MEMS substrate comprises a first movable element and a second movable element; a first enclosed space surrounded by the MEMS substrate and the cap substrate, wherein the first movable element is in the first enclosed space; a second enclosed space surrounded by the MEMS substrate and the cap substrate, wherein the second movable element is in the second enclosed space, a volume of the first enclosed space is larger than a volume of the second enclosed space, and a pressure in the first enclosed space is smaller than a pressure in the second enclosed space; a pressure-changing layer in one of the first enclosed space and the second enclosed space; and a surrounding blocking layer surrounding the first enclosed space and the second enclosed space, wherein the surrounding blocking layer surrounds sidewalls of the first enclosed space and the second enclosed space, and the surrounding blocking layer is configured to block gas outside of the first enclosed space and the second enclosed space from entering the first enclosed space and the second enclosed space.