Acoustic transducer and microphone

摘要

An acoustic transducer includes a slit having higher passage resistance than in conventional structures and having a lower rate of decrease in the passage resistance than in conventional structures when, for example, the vibration electrode plate warps. The acoustic transducer includes a stationary electrode plate, and a vibration electrode plate facing the stationary electrode plate with a space between the electrode plates. The vibration electrode plate includes a slit that allows sound to pass through. The vibration electrode plate includes a resistance increasing section including at least one pair of high-resistance surfaces that constitute side surfaces of the slit in a width direction thereof, and are thicker than a middle portion of the vibration electrode plate.

主权项

1. An acoustic transducer, comprising:
a stationary electrode plate; and a vibration electrode plate facing the stationary electrode plate with a space between the electrode plates, the vibration electrode plate including a slit that allows sound to pass through, wherein the slit includes a straight portion that extends substantially parallel to a peripheral side of the vibration electrode plate, the vibration electrode plate includes a resistance increasing section that increases resistance to passage of sound through the slit, and the resistance increasing section includes at least one pair of high-resistance surfaces that constitute side surfaces of the slit in a width direction and are thicker than a middle portion of the vibration electrode plate, and the high-resistance surfaces overlap in the width direction of the slit; and the resistance increasing section extends along the straight portion of the slit.