| 摘要 |
<p>A speaker is adapted to transmit sound waves in an omni-directional manner relative to an installation surface upon which the speaker is mounted. The speaker includes an oscillator (12) having a hemispherical oscillating body (14) comprising a piezoelectric body polarized in a thickness direction thereof, a pair of electrodes (16a,16b) provided on an inner surface and an outer surface of the oscillating body, input terminals (20) connected to the electrodes via lead wires, an end portion of the oscillator being connected to spacers (29) in a groove (27) to cover a projecting portion (24) of a horn (22), a cavity (30) communicating with a passage (28) in the horn and being defined between the oscillator and the horn and support members (32) fixed to a flange portion (26) of the horn whereby a sound transmission path (36) communicating with the passage in the horn is defined between the horn (22) and the installation surface upon which the speaker is mounted such that the sound transmission path extends in all directions relative to the installation surface.</p> |
