Piezoelectric speaker
First Claim
1. A piezoelectric speaker, comprising:
- an outer case including an external surface having a first external opening at a first end of the outer case and a second external opening at a second end of the outer case and a main body disposed between the first end and the second end, the main body including a first aperture and a second aperture;
a first sounding member located at the first aperture of said main body, the first sounding member including at least one first piezoelectric body which is arranged to be vibrated in response to receiving electrical signals; and
a second sounding member located at the second aperture of said main body, the second sounding member including at least one second piezoelectric body and which is arranged to be vibrated in response to receiving electrical signals;
whereinsaid first and second piezoelectric bodies are arranged to be vibrated in a direction in which internal pressure of said main body increases or decreases at said first and second sounding members;
the outer case has a third external opening located at the main body and having an area smaller than an area of a vibrating portion of each of said first and second sounding members.
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Accused Products
Abstract
A piezoelectric speaker has a substantially reduced size and reproduces sound in the low sound range. The piezoelectric speaker includes a cylindrical main body. First and second sounding members are secured to apertures of both sides of the main body in an air tight arrangement via ringed dampers made of rubber. An external opening is created at the middle of a side surface of the main body. The opening is created so as to have an area which is less than area of a vibrating portion of the sounding members. Sound absorbing members are provided within the main body, on the outside of the first sounding member and on the outside of the second sounding member. Caps having a plurality of holes are secured to the apertures of the both sides of the main body so as to cover the sound absorbers. The main body is supported on concave portions of leg members.
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Citations
23 Claims
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1. A piezoelectric speaker, comprising:
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an outer case including an external surface having a first external opening at a first end of the outer case and a second external opening at a second end of the outer case and a main body disposed between the first end and the second end, the main body including a first aperture and a second aperture; a first sounding member located at the first aperture of said main body, the first sounding member including at least one first piezoelectric body which is arranged to be vibrated in response to receiving electrical signals; and a second sounding member located at the second aperture of said main body, the second sounding member including at least one second piezoelectric body and which is arranged to be vibrated in response to receiving electrical signals;
whereinsaid first and second piezoelectric bodies are arranged to be vibrated in a direction in which internal pressure of said main body increases or decreases at said first and second sounding members; the outer case has a third external opening located at the main body and having an area smaller than an area of a vibrating portion of each of said first and second sounding members. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A piezoelectric speaker, comprising:
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an outer case including a first sound producing chamber and a first external opening for emitting sound waves therefrom to outside of the speaker, the outer case including a main body; a first cap provided at a first end of the outer case and defining a second sound producing chamber, the first cap including second external openings for emitting sound waves therefrom to outside of the speaker; a second cap provided at a second end of the outer case and defining a third sound producing chamber, the second cap including third external openings for emitting sound waves therefrom to outside of the speaker; a first sounding member located between the first sound producing chamber and the second sound producing chamber and adapted to be vibrated to emit sound waves; and a second sounding member located between the first sound producing chamber and the third sound producing chamber and adapted to be vibrated to emit sound waves, wherein the first external opening of the outer case has an area smaller than an area of a vibrating portion of each of the first and second sounding members, and the first, second and third external openings being arranged such that sound waves generated by the first sounding member are emitted from the second external openings to outside of the speaker and are transmitted to the first sound producing chamber, the sound waves generated by the second sounding member are emitted from the third external openings to outside of the speaker and are transmitted to the first sound producing chamber, and the sound waves from the first sounding member and the second sounding member are combined in the first sound producing chamber and are emitted from the first external opening to outside of the speaker. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification