Patent ID: 7231058

Claim:
An electroacoustic transducer comprising: a diaphragm; a casing for supporting the diaphragm; a drive coil provided on the diaphragm; a sole first magnetic structure having a first space in a center thereof provided within the casing such that a center axis, which is a straight line perpendicular to a plane of the diaphragm, passes through a center of the drive coil and penetrates the first space; and a sole second magnet magnetic structure having a second space in a center thereof and provided within the casing on a side opposed to the first sole magnetic structure with respect to the diaphragm, such that the center axis penetrates the second space, wherein the sole first magnetic structure is oriented such that a magnetization direction thereof is parallel to the center axis, wherein the sole second magnetic structure is oriented such that a magnetization direction thereof is opposite to that of the sole first magnetic structure, and wherein the drive coil is located where the diaphragm intersects with a straight line which passes through an outer edge of the sole first magnetic structure and an outer edge of the sole second magnetic structure and which straight line is parallel to the center axis.