Piezolectric transducer having spider-like frame structure

Claim 2

An electroacoustic transducer of the flexural vibrating type comprising laminated transducer means assembled inside a tubular housing, said transducer laminate comprising a first laminate spider-like frame member having a peripheral rim portion and a first central plate sound opaque mask portion, means including a second laminate spider-like frame member with a peripheral rim portion and a second and vibratile central plate portion, a plurality of spoke-like members for connecting said first and second central plate portions to their associated peripheral rim portions, transducer means comprising a plate of piezoelectric material bonded to the surface of said second central plate portion of said second spider-like frame member, and annular holding laminate means for supporting said first and second frame members in spaced parallel relationship.

Claim 3

An electroacoustic transducer of the flexural vibrating type comprising laminated transducer means assembled inside a tubular housing, said transducer laminate comprising a first laminate spider-like frame member having a peripheral rim portion and a first central plate sound opaque mask portion, means including a second laminate spider-like frame member with a peripheral rim portion and a second and vibratile central plate portion, a plurality of spoke-like members for connecting said first and second central plate portions to their associated peripheral rim portions, transducer means comprising a plate of piezoelectric material bonded to the surface of said second central plate portion of said second spider-like frame member, and annular holding laminate means for supporting said first and second frame members in spaced parallel relationship.

Claim 4

An electroacoustic transducer of the flexural vibrating type comprising laminated transducer means assembled inside a tubular housing, said transducer laminate comprising a first laminate spider-like frame member having a peripheral rim portion and a first central plate sound opaque mask portion, means including a second laminate spider-like frame member with a peripheral rim portion and a second and vibratile central plate portion, a plurality of spoke-like members for connecting said first and second central plate portions to their associated peripheral rim portions, transducer means comprising a plate of piezoelectric material bonded to the surface of said second central plate portion of said second spider-like frame member, and annular holding laminate means for supporting said first and second frame members in spaced parallel relationship.

Claim 5

The invention in claim 1 characterized in that said first central plate portion of said first frame member is square.

Claim 6

The invention in claim 2 further characterized in that said second central plate portion of said second frame member is square, and still further characterized in that the area of said first central plate portion is less than the area of said second central plate portion.

Claim 7

The invention in claim 3 further characterized in that said square central plate portions of said frame members are suspended in spaced parallel relationship to one another with their centers located on a common axis perpendicular to said plates, and still further characterized in that one of said square central plate portions is oriented with its sides rotated by 45* with respect to the corresponding sides of the other of said square central plate portions.

Claim 8

The invention in claim 4 further characterized in that the area of said first central plate portion is approximately one-half the area of said second central plate portion.

Claim 9

The invention in claim 5 further characterized in that one end of each of the spoke-like members of said second spider-like frame member is attached to the centers of individually associated sides of said second central square portion, and still further characterized in that the first spider-like frame member Also has a plurality of spoke-like connecting members, one end of each of said spoke-like members of the first frame member being attached to an individually associated corner of said first central square portion.

Claim 10

An electroacoustic transducer of a flexural vibrating type comprising a tubular housing structure; sound opaque masking means including a first frame member having a first peripheral rim portion, a first central square plate portion, and a plurality of spoke-like members interconnecting said first central plate portion and said first peripheral rim portion; vibratile means comprising a second frame member including a second peripheral rim portion, a second square central plate portion, and a plurality of spoke-like members interconnecting said second central plate portion and said second peripheral rim portion; transducing means including a piezoelectric plate bonded to the surface of said second central plate portion; annular spacer means separating said first and said second frame members from each other within said tubular housing structure; and means for securing said spacer means and said frame members in a stacked array within said housing structure.

Claim 11

An electroacoustic transducer of a flexural vibrating type comprising a tubular housing structure; sound opaque masking means including a first frame member having a first peripheral rim portion, a first central square plate portion, and a plurality of spoke-like members interconnecting said first central plate portion and said first peripheral rim portion; vibratile means comprising a second frame member including a second peripheral rim portion, a second square central plate portion, and a plurality of spoke-like members interconnecting said second central plate portion and said second peripheral rim portion; transducing means including a piezoelectric plate bonded to the surface of said second central plate portion; annular spacer means separating said first and said second frame members from each other within said tubular housing structure; and means for securing said spacer means and said frame members in a stacked array within said housing structure.

Claim 12

The invention in claim 7 characterized in that the area of said first central square plate portion is approximately one-half the area of said second square central plate portion.

Claim 13

The invention in claim 8 further characterized in that said first and said second frame members are oriented so that the sides of said first central square portion are rotated 45* with respect to the sides of said second central square portion.

Claim 14

The invention in claim 9 further characterized in that said spoke-like members in said second frame member extend from the centers of the sides of said second central square plate portion to said rim portion whereby the flexural resonance vibration of said second central square portion is unrestricted by said spoke-like members.