Patent ID: 11883845
Assignee: BFLY OPERATIONS, INC
Field: Micro-structural and nano-technology (Chemistry)
Classification: CPC B | IPC B

Claim 10:
11. A method of forming an ultrasonic transducer device, the method comprising:
depositing a first layer on a substrate;
patterning the first layer at a region corresponding to a location of a transducer cavity;
conformally depositing an additional layer of a same type as the first layer on the first layer and exposed portions of the substrate;
conformally depositing a second layer on the additional layer of the same type as the first layer;
conformally depositing a third layer on the second layer;
conformally depositing a fourth layer on the third layer;
planarizing the fourth layer to a top surface of the third layer;
depositing a membrane support layer;
defining the transducer cavity in the support layer, wherein exposed portions of the third layer and the fourth layer are removed;
bonding a membrane to the support layer.