Claims
- 1. A speaker comprising:a unitary piezoelectric oscillating body having a substantially hemispherical shape and including an outer surface and an inner surface; a driver connected to the oscillating body for oscillating the oscillating body including a first driver connected to the outer surface of the oscillating body and a second driver connected to the inner surface of the oscillating body to drive the oscillating body; and a phase transfer device disposed at the inner surface of the oscillating body and arranged to phase transfer sound waves emitted from the inner surface of the oscillating body such that a sound wave emitted from the outer surface of the oscillating body and a sound wave emitted from the inner surface of the oscillating body are made to have substantially the same phase.
- 2. A speaker according to claim 1, wherein a horn is provided at the inner surface of the oscillating body.
- 3. A speaker according to claim 2, wherein said phase transfer device includes a hole provided within the horn and arranged to phase transfer sound waves from the inner surface of the oscillating body to outside of the speaker.
- 4. A speaker according to claim 2, wherein said phase transfer device includes a cavity located between the inner surface of the oscillating body and the horn.
- 5. A speaker according to claim 2, wherein the phase transfer device includes a path located between the horn and a surface upon which the speaker is supported.
- 6. A speaker according to claim 5, wherein said path is arranged to extend substantially along all directions relative to a direction that is substantially parallel to the surface upon which the speaker is supported.
- 7. A speaker according to claim 1, wherein the substantially hemispherical body includes a piezoelectric body.
- 8. A speaker according to claim 1, wherein the driving device includes a first driving electrode provided on the outer surface of the oscillating body and a second driving electrode provided on the inner surface of the oscillating body.
- 9. A speaker comprising:an oscillating means for generating oscillation in response to an input signal, the oscillating means including a unitary piezoelectric body having a substantially hemispherical shape and including an outer surface and an inner surface; means for driving the oscillating means including a first driving means connected to the outer surface and a second driving means connected to the inner surface for driving the oscillating means; and a phase transferring means for transferring sound waves emitted from the inner surface of the oscillating means such that a sound wave emitted from the outer surface of the oscillating means and a sound wave emitted from the inner surface of the oscillating means are made to have substantially the same phase.
- 10. A speaker according to claim 9, wherein a horn is provided at the inner surface of the oscillating means.
- 11. A speaker according to claim 10, wherein said phase transferring means includes a hole provided within the horn and arranged to phase transfer sound waves from the inner surface of the oscillating means to outside of the speaker.
- 12. A speaker according to claim 10, wherein said phase transferring means includes a cavity located between the inner surface of the oscillating means and the horn.
- 13. A speaker according to claim 10, wherein the phase transferring means includes a path located between of the horn and a surface upon which the speaker is supported.
- 14. A speaker according to claim 13, wherein said path is arranged to extend substantially along all directions relative to a direction that is substantially parallel to the surface upon which the speaker is supported.
- 15. A speaker comprising:a substantially hemispherical oscillating body defined by a monolithic piezoelectric body having an inner surface and an outer surface; and a driving device including a first driving electrode provided on the outer surface of the oscillating body and a second driving electrode provided on the inner surface of the oscillating body; and a phase transfer device disposed at the inner surface of the oscillating body and arranged to phase transfer sound waves emitted from the inner surface of the oscillating body such that a sound wave emitted from the outer surface of the oscillating body and a sound wave emitted from the inner surface of the oscillating body are made to have substantially the same phase.
- 16. A speaker according to claim 15, wherein a horn is provided at the inner surface of the oscillating body.
- 17. A speaker according to claim 16, wherein said phase transfer device includes a hole provided within the horn and arranged to phase transfer sound waves from the inner surface of the oscillating body to outside of the speaker.
- 18. A speaker according to claim 16, wherein said phase transfer device includes a cavity located between the inner surface of the oscillating body and the horn.
- 19. A speaker according to claim 16, wherein the phase transfer device includes a path located between the horn and a surface upon which the speaker is supported.
- 20. A speaker according to claim 19, wherein said path is arranged to extend substantially along all directions relative to a direction that is substantially parallel to the surface upon which the speaker is supported.
- 21. A speaker comprising:an oscillating device having a substantially hemispherical shape and including a piezoelectric body having an outer surface and an inner surface; a driver connected to the oscillating device for oscillating the piezoelectric body and including a first driving electrode provided on the outer surface of the piezoelectric body and a second driving electrode provided on the inner surface of the piezoelectric body; and a phase transfer device disposed at the inner surface of the piezoelectric body and arranged to phase transfer sound waves emitted from the inner surface of the piezoelectric body such that a sound wave emitted from the outer surface of the piezoelectric body and a sound wave emitted from the inner surface of the piezoelectric body are made to have substantially the same phase.
- 22. A speaker according to claim 21, wherein a horn is provided at the inner surface of the piezoelectric body.
- 23. A speaker according to claim 22, wherein said phase transfer device includes a hole provided within the horn and arranged to phase transfer sound waves from the inner surface of the piezoelectric body to outside of the speaker.
- 24. A speaker according to claim 22, wherein said phase transfer device includes a cavity located between the inner surface of the piezoelectric body and the horn.
- 25. A speaker according to claim 22, wherein the phase transfer device includes a path located between the horn and a surface upon which the speaker is supported.
- 26. A speaker according to claim 25, wherein said path is arranged to extend substantially along all directions relative to a direction that is substantially parallel to the surface upon which the speaker is supported.
- 27. A speaker comprising:a substantially hemispherical oscillating body having an inner surface and an outer surface, wherein the substantially hemispherical oscillating body includes a piezoelectric body, a driving device including a first driving electrode provided on the outer surface of the oscillating body and a second driving electrode provided on the inner surface of the oscillat ing body; and a phase transfer device disposed at the inner surface of the oscillating body and arranged to phase transfer sound waves emitted from the inner surface of the oscillating body such that a sound wave emitted from the outer surface of the oscillating body and a sound wave emitted from the inner surface of the oscillating body have substantially the same phase.
- 28. A speaker according to claim 27, wherein a horn is provided at the inner surface of the oscillating body.
- 29. A speaker according to claim 27, wherein a horn is provided at the inner surface of the oscillating body, and said phase transfer device includes a hole provided within the horn and is arranged to phase transfer sound waves from the inner surface of the oscillating body to the outside of the speaker.
- 30. A speaker according to claim 27, wherein said phase transfer device includes a cavity located between the inner surface of the oscillating body and the horn.
- 31. A speaker according to claim 27, wherein said phase transfer device includes a path located between the horn and a surface upon which the speaker is mounted.
- 32. A speaker according to claim 31, wherein said path is arranged to extend substantially along all directions relative to a direction that is substantially parallel to the surface upon which the speaker is supported.
Parent Case Info
This is a Continuation of U.S. patent application Ser. No. 08/864,334 filed on May 28, 1997.
US Referenced Citations (6)
Foreign Referenced Citations (1)
Number |
Date |
Country |
560727 |
Apr 1944 |
GB |
Continuations (1)
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Number |
Date |
Country |
Parent |
08/864334 |
May 1997 |
US |
Child |
09/213043 |
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US |