| 摘要 |
PROBLEM TO BE SOLVED: To secure the omnidirection in the direction that is parallel to an installation surface of a speaker. SOLUTION: A speaker 10 includes a vibrator 12, and the vibrator 12 includes a hemispherical vibrator 14 consisting of a piezoelectric substance that is polarized in its thickness direction. The electrodes 16a and 16b are formed on the inner and outer surfaces of the vibrator 14, and an input terminal 20 is connected to both electrodes 16a and 16b via the lead wires 18a and 18b respectively. The end part of the vibrator 12 is fixed to three spacers 29 included in a groove 27 as if the vibrator 12 covered a protruded part 24 of a horn 22. A cavity 30 linking a hole 28 of the horn 22 is formed between the vibrator 12 and the horn 22. Three supports 32 are fixed to a flange part 26 by the screws 34. Thus a path 36 linking the hole 28 of the horn 22 is formed between the horn 22 and the installation surface of the speaker 10 almost in all directions parallel to the installation surface of the speaker 10. |
