Microspeaker with piezoelectric, metal and dielectric membrane
First Claim
Patent Images
1. An apparatus comprising:
- a substrate;
a deformable membrane; and
a speaker cavity disposed between the substrate and the deformable membrane such that the deformable membrane spans the speaker cavity, wherein the speaker cavity is a sealed speaker cavity that it is enclosed on all sides,the deformable membrane including a first piezoelectric layer sandwiched between first and second metal layers and including a dielectric layer, wherein the dielectric layer is configured to deform on application of a drive voltage across the first piezoelectric layer.
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Abstract
This disclosure provides systems, methods and apparatus for microspeaker devices. In one aspect, a microspeaker element may include a deformable dielectric membrane that spans a speaker cavity. The deformable dielectric membrane can include a piezoactuator and a dielectric layer. Upon application of a driving signal to the piezoactuator, the dielectric layer can deflect, producing sound. In some implementations, an array of microspeaker elements can be encapsulated between a glass substrate and a cover glass. Sound generated by the microspeaker elements can be emitted through a speaker grill formed in the cover glass.
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Citations
27 Claims
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1. An apparatus comprising:
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a substrate; a deformable membrane; and a speaker cavity disposed between the substrate and the deformable membrane such that the deformable membrane spans the speaker cavity, wherein the speaker cavity is a sealed speaker cavity that it is enclosed on all sides, the deformable membrane including a first piezoelectric layer sandwiched between first and second metal layers and including a dielectric layer, wherein the dielectric layer is configured to deform on application of a drive voltage across the first piezoelectric layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus comprising:
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an array of piezoactuated microspeaker elements between first and second joined glass substrates; each piezoactuated microspeaker element including a speaker cavity and a deformable membrane spanning the speaker cavity, the deformable membrane including a first piezoelectric layer sandwiched between first and second metal layers and including a dielectric layer, wherein the dielectric layer is configured to deform on application of a drive voltage across the piezoelectric layer; and the second glass substrate including one or more acoustic ports such that the acoustic ports are disposed over the array. - View Dependent Claims (21, 22, 23, 24)
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25. An apparatus comprising:
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a substrate; a deformable membrane; and a speaker cavity disposed between the substrate and the deformable membrane such that the deformable membrane spans the speaker cavity, wherein the speaker cavity is defined only by the substrate and the deformable membrane and wherein at least the portion of the substrate that defines the speaker cavity is planar, the deformable membrane including a first piezoelectric layer sandwiched between first and second metal layers and including a dielectric layer, wherein the dielectric layer is configured to deform on application of a drive voltage across the first piezoelectric layer. - View Dependent Claims (26, 27)
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Specification