Speaker apparatus and method for driving speaker
A speaker apparatus includes an acoustic vibration plate, and an actuator mounted to the acoustic vibration plate such that one end and the other end thereof, in a driving axis direction, exist in a plate surface of the acoustic vibration plate. The actuator applies vibration to the acoustic vibration plate to play back sound. The speaker apparatus enables a sound image to uniformly spread over the entire plate surface of the acoustic vibration plate. In addition, the entire speaker apparatus can be made compact.
1. A speaker apparatus comprising:
an acoustic vibration plate; and
an actuator mounted to the acoustic vibration plate such that a first end of the actuator and a second end of the actuator exist in a plate surface of the acoustic vibration plate, the second end being opposite the first end in a driving axis direction of the actuator.
2. The speaker apparatus according to claim 1 , wherein the acoustic vibration plate has a hole in which the actuator is mounted.
3. The speaker apparatus according to claim 1 , wherein the acoustic vibration plate is plate-shaped.
4. The speaker apparatus according to claim 3 , wherein the driving axis direction of the actuator and a second direction do not form a right angle, the second direction being a direction in which vibration propagates in the acoustic vibration plate.
5. The speaker apparatus according to claim 3 , wherein an outer end surface of the acoustic vibration plate is shaped as a concave-convex surface.
6. The speaker apparatus according to claim 1 , wherein the acoustic vibration plate is curved.
7. The speaker apparatus according to claim 1 , wherein the acoustic vibration plate is tubular.
8. The speaker apparatus according to claim 7 , wherein the driving axis direction of the actuator is inclined with respect to a central axis direction of the acoustic vibration plate and a direction perpendicular to the central axis direction.
9. The speaker apparatus according to claim 1 , wherein the actuator is a magnetostrictive actuator.
10. The speaker apparatus according to claim 1 , wherein the actuator is a piezoelectric actuator.
11. A speaker apparatus comprising:
an acoustic vibration plate; and
first and second actuators mounted in the acoustic vibration plate such that each actuator has a first end and a second end, existing in a plate surface of the acoustic vibration plate, the second end being opposite the first end in a driving axis direction of the actuator.
12. The speaker apparatus according to claim 11 , wherein the driving axis direction of the first actuator is not parallel to the driving axis direction of the second actuator.
13. A method for driving a speaker, the speaker having an acoustic vibration plate and first and second actuators mounted in the acoustic vibration plate such that each actuator has a first end and a second end existing in a plate surface of the acoustic vibration plate, the second end being opposite the first end in a driving axis direction of the actuator, the method comprising:
driving the first actuator with left-channel audio signals among stereo audio signals; and
driving the second actuator with right-channel audio signals among the stereo audio signals.
14. The method according to claim 13 , wherein, in the speaker, the driving axis direction of the first actuator is not parallel to the driving axis direction of the second actuator.
15. A speaker apparatus comprising:
a non-cylindrical acoustic vibration plate; and
an actuator mounted to the non-cylindrical acoustic vibration plate and configured to apply a vibrational force in a longitudinal-wave direction to the non-cylindrical acoustic vibration plate.
16. The speaker apparatus according to claim 15 , wherein a first end of the actuator and a second end of the actuator exist in a plane parallel to a plate surface of the acoustic vibration plate.
17. The speaker apparatus according to claim 15 , wherein a first end of the actuator and a second end of the actuator exist in a plane that is tangent to a plate surface of the acoustic vibration plate.
18. A method for driving a speaker, the speaker having a non-cylindrical acoustic vibration plate and an actuator mounted to the non-cylindrical acoustic vibration plate, the method comprising:
applying a force in a longitudinal-wave direction to the non-cylindrical acoustic vibration plate.
19. The method according to claim 18 , wherein a first end of the actuator and a second end of the actuator exist in a plane parallel to a plate surface of the acoustic vibration plate.
20. The method according to claim 18 , wherein a first end of the actuator and a second end of the actuator exist in a plane that is tangent to a plate surface of the acoustic vibration plate.