Patent ID: 7838323
Filing Date: 2010-11-23
Classification: B23K,B81B,B81C

Abstract:
1. A method for manufacturing a MEMS microphone, comprising steps of: (a) forming a vibrating film on a silicon semiconductor wafer including a plurality of chip regions; (b) forming a fixed film with a plurality of first holes above the vibrating film; (c) forming a second hole by etching the silicon semiconductor wafer in each of the plurality of chip regions so as to expose a back surface of the vibrating film; (d) providing a cavity between the vibrating film and the fixed film by etching; (e) modifying a crystalline structure of the silicon semiconductor wafer by irradiating a scribe region surrounding each of the plurality of chip regions with a laser from a side of a surface of the silicon semiconductor wafer on which the fixed film is formed; and (f) dicing the silicon semiconductor wafer along the modified crystalline structure, wherein: the step (e) is carried out after the step (d), and in the step (e), a cutting area in the scribe region of the silicon semiconductor wafer is irradiated with the laser, and no deposited oxide film is provided in the cutting area, which is irradiated with the laser, on the surface of the side of the silicon semiconductor wafer on which the fixed film is formed.