Method of making an electroacoustic transducer

Claim 3

The method of claim 1 wherein step (A) comprises the further sub-step of initially forming said recess with a depth which is more than three times the thickness of said vibratile diaphragm.

Claim 4

The method of claim 2 and the further sub-steps of forming a chamber by means of a second recess in said housing, installing at least some electrical components in said chamber, and connecting said components to drive said transducing element.

Claim 5

The method of claim 3 and the further sub-step of filling said chamber with a potting compound.

Claim 6

The method of claim 1 and the further sub-step of forming a chamber by means of a second recess in said housing, installing at least some electrical components in said chamber, and connecting said components to drive said transducing element.

Claim 7

The method of claim 5 and the further sub-step of filling said chamber with a potting compound.

Claim 8

The method of claim 1 wherein step (A) comprises the further step of forming the external wall of said housing to recede away from said flat surface whereby the material removed in step (D) is removed exclusively from said flat surface and not from the surrounding areas of said external wall.

Claim 9

The method of claim 7 wherein said receding surface is a truncated conical surface and said flat surface is a disk at the apex of said truncated cone.

Claim 10

A process for making an electroacoustic transducer comprising the steps of forming: A. a vibratile disk clamped at its periphery to a rigid housing structure, said vibratile disk being an external flat portion free of all upstanding structures protruding above the surface of said disk, B. surrounding said disk by a massive somewhat cylindrical wall-like member, said massive wall being defined by a recessed circular cavity in the internal wall surface of said housing, the bottom of said cavity being opposite said external flat portion, C. forming a single disk of piezoelectric material having a diameter that is substantially smaller than the diameter of said recessed cavity, D. forming an electrode surface on each opposite face side of said piezoelectric material, said electrode surface covering substantially the entire surface of said single disk of piezoelectric material, E. bonding one side of said piezoelectric disk to the inside surface of said recessed cavity opposite saiD external flat portion, F. attaching electrical conductors to the electrode on the other side of said disk, whereby the entire disk experiences the same instantaneous electrical stresses, G. driving said transducer by applying a driving signal to said conductor, H. measuring the frequency of said transducer while said signal is applied to said conductor, and I. removing material from said external flat portion, the amount of removed material being proportioned to the deviation between the measured frequency and a desired predetermined frequency.

Claim 11

A process for making an electroacoustic transducer comprising the steps of forming: A. a vibratile disk clamped at its periphery to a rigid housing structure, said vibratile disk being an external flat portion free of all upstanding structures protruding above the surface of said disk, B. surrounding said disk by a massive somewhat cylindrical wall-like member, said massive wall being defined by a recessed circular cavity in the internal wall surface of said housing, the bottom of said cavity being opposite said external flat portion, C. forming a single disk of piezoelectric material having a diameter that is substantially smaller than the diameter of said recessed cavity, D. forming an electrode surface on each opposite face side of said piezoelectric material, said electrode surface covering substantially the entire surface of said single disk of piezoelectric material, E. bonding one side of said piezoelectric disk to the inside surface of said recessed cavity opposite saiD external flat portion, F. attaching electrical conductors to the electrode on the other side of said disk, whereby the entire disk experiences the same instantaneous electrical stresses, G. driving said transducer by applying a driving signal to said conductor, H. measuring the frequency of said transducer while said signal is applied to said conductor, and I. removing material from said external flat portion, the amount of removed material being proportioned to the deviation between the measured frequency and a desired predetermined frequency.