Patent ID: 7610670

Claim:
A method for manufacturing a diaphragm assembly used for a condenser microphone and having a diaphragm made of a resin film including a metallized film on one surface set up on a supporter ring, comprising: a first step of bonding a ring jig of a larger diameter than the supporter ring to the resin film having the metallized film composed of a ductile metallic material on one surface via an adhesive without exerting tension on the resin film; a second step of heating and contracting the resin film bonded to the ring jig without applying the tension at a temperature over a glass transition point of a film material; and a third step of bonding the supporter ring to the resin film via an adhesive in a state of exerting predetermined tension on the resin film and cutting the diaphragm assembly out of the resin film after waiting for hardening of the adhesive, wherein the resin film is heated at a predetermined temperature after bonding the resin film to the supporter ring and before cutting the resin film in the third step.