High displacement ultrasonic transducer
In some examples, a method of fabricating a transducer includes disposing a plurality of anchors on a substrate and disposing a sealing material and a device layer over the anchors and the substrate to form a cavity, the sealing material sealing the cavity. The method may further include forming, in the device layer, a plate and at least one spring member. The at least one spring member may be supported by at least one anchor of the plurality of anchors, and the at least one spring member may support the plate to allow relative movement between the plate and the substrate.
1. A method of fabricating a transducer comprising:
disposing a plurality of anchors on a first substrate or a second substrate;
joining the first substrate and the second substrate by the plurality of anchors to form a cavity, wherein one of first substrate or the second substrate comprises a sealing material and a device layer, the sealing material at least partially sealing the cavity; and
forming, in the device layer of the one of the first substrate or the second substrate, a plate and at least one spring member, wherein the at least one spring member is supported by at least one anchor of the plurality of anchors, and the at least one spring member supports the plate to allow relative movement between the plate and the other one of the first substrate or the second substrate, wherein:
forming the plate and the at least one spring member comprises forming at least one opening between the plate and the at least one spring member; and
the sealing material seals the at least one opening.
2. The method as recited in claim 1 , further comprising:
forming a plurality of the plates side-by-side to form a plurality of transducer cells, each transducer cell comprising a respective plate; and
sealing at least a perimeter of the plurality of transducer cells with the sealing material.
3. The method as recited in claim 1 , further comprising:
forming a plurality of the plates side-by-side to form a first plurality of the transducer cells as a first array element and a second plurality of the transducer cells as a second array element; and
sealing a first perimeter of the first array element, and sealing a second perimeter of the second array element.
4. The method as recited in claim 1 , further comprising:
forming a plurality of the plates side-by-side to form a plurality of transducer cells, each transducer cell comprising a respective plate and a respective cavity; and
sealing the plurality of transducer cells, wherein individual cavities corresponding to respective transducing cells are sealed from other cavities of adjacent transducing cells.
5. The method as recited in claim 1 , wherein the sealing material includes a flexible film, the method further comprising disposing the flexible film under the device layer.
6. The method as recited in claim 1 , wherein the sealing material includes a flexible film, the method further comprising disposing the flexible film over the device layer.
7. The method as recited in claim 1 , further comprising:
at least one of forming the substrate from a conductive material or depositing an electrode layer on the substrate, wherein the substrate includes a first electrode; and
at least one of forming the plate from a conductive material or depositing an electrode layer on the plate, wherein the plate includes a second electrode.
8. A method of fabricating a transducer comprising:
disposing a plurality of anchors on a substrate;
disposing a sealing material and a device layer over the anchors and the substrate to form a cavity, the sealing material at least partially sealing the cavity; and
forming, in the device layer, a plate and at least one spring member, wherein the at least one spring member is supported by at least one anchor of the plurality of anchors, and the at least one spring member supports the plate to allow relative movement between the plate and the substrate, wherein:
forming the plate and the at least one spring member comprises forming at least one opening between the plate and the at least one spring member; and
the sealing material seals the at least one opening.
9. The method as recited in claim 8 , wherein the sealing material includes a flexible film disposed at least one of over the plate or under the plate.
10. The method as recited in claim 8 , further comprising:
forming a plurality of the plates side-by-side to form a plurality of transducer cells, each transducer cell comprising a respective plate; and
sealing at least a perimeter of the plurality of transducer cells with the sealing material.
11. A method of fabricating a transducer comprising:
disposing a plurality of anchors on one of a first substrate or a second substrate;
joining the first substrate and the second substrate by the plurality of anchors to form a cavity, wherein one of first substrate or the second substrate comprises a sealing material and a device layer, the sealing material including a film as a sealing layer that at least partially seals the cavity to inhibit gas or liquid from passing into or out of the cavity; and
forming, in the device layer of the one of the first substrate or the second substrate, a plate and a plurality of spring members, wherein each spring member of the plurality of spring members is supported by at least one anchor of the plurality of anchors, and the plurality of spring members support the plate to allow relative movement between the plate and the other one of the first substrate or the second substrate, wherein:
forming the plate and the plurality of spring members comprises forming at least one opening between the plate and the plurality of spring members; and
the sealing material seals the at least one opening.
12. The method as recited in claim 11 , further comprising:
forming a plurality of the plates side-by-side to form a plurality of transducer cells, each transducer cell comprising a respective plate; and
sealing at least a perimeter of the plurality of transducer cells with the sealing material.
13. The method as recited in claim 11 , further comprising:
forming a plurality of the plates side-by-side to form a first plurality of the transducer cells as a first array element and a second plurality of the transducer cells as a second array element; and
sealing a first perimeter of the first array element, and sealing a second perimeter of the second array element.
14. The method as recited in claim 11 , further comprising:
forming a plurality of the plates side-by-side to form a plurality of transducer cells, each transducer cell comprising a respective plate and a respective cavity; and
sealing the plurality of transducer cells, wherein individual cavities corresponding to respective transducing cells are sealed from other cavities of adjacent transducing cells.
15. The method as recited in claim 11 , the method further comprising disposing the film as a flexible film at least one of over the device layer or under the device layer.
16. The method as recited in claim 11 , the method further comprising disposing the film as a flexible film that is more flexible than the plurality of spring members to allow the plate to vibrate to at least one of transmit or receive ultrasound energy.
17. The method as recited in claim 11 , further comprising:
at least one of forming the substrate from a conductive material or depositing an electrode layer on the substrate, wherein the substrate includes a first electrode; and
at least one of forming the plate from a conductive material or depositing an electrode layer on the plate, wherein the plate includes a second electrode.