Sound generator and method for manufacturing the same

A method for manufacturing a sound generator configured to generate a sound by vibrating a diaphragm, the method comprising:

• preparing a sound generator including:
• a sound generating body that includes:
• the diaphragm including an inner circumferential portion and an outer circumferential portion that has a hollow truncated cone shape and extends outward from an outer edge of the inner circumferential portion;
• and
• a driving portion configured to vibrate the diaphragm when energized to generate the sound;
• a base that includes;
• a base tubular portion configured to house the sound generating body;
• and
• a partition wall disposed in one end portion of the base tubular portion in an axial direction of the base tubular portion and having a sound emission portion where the sound generating body is disposed, the sound emission portion of the partition wall defining a sound hole through which the sound generated by the sound generating body emits, the diaphragm and the partition wall dividing an inner space of the base tubular portion into a first space and a second space;
• a protection wall that is disposed away from the partition wall in a vibrating direction of the diaphragm with a gap to cover the sound emission portion of the partition wall;
• and
• an erected wall that connects between the protection wall and the base tubular portion, the protection wall, the erected wall, and the partition wall defining a sound emission space, wherein
• the sound emission space is in communication with the first space through the sound hole,
• the sound emission space defines an emission hole opening in at least one direction,
• the sound emits to the sound emission space through the sound hole from the first space and exits through the emission hole,
• the partition wall has one surface facing the protection wall,
• Ya is defined as a distance between the one surface and the protection wall,
• Yb is defined as a distance between the one surface of the partition wall and a boundary between the inner circumferential portion and the outer circumferential portion of the diaphragm, and
• Ya>Yb;
• and
• testing an airtightness of the sound generator by:
• inserting a jig into the sound hole through the emission hole;
• and
• increasing a pressure in the second space to be higher than a pressure in the first space and to inflate the diaphragm toward the first space while the jig is set inside the sound hole.