Patent US4190937A successfully refreshed from Google Patents.
US4190937A
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Method of manufacturing electroacoustic transducer elements which operate in the vicinity of resonance
Assignee: MASSA DONALD P COHASSET
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Filing: 1979-01-02
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Granted: 1980-03-04
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Expires: 1999-01-02
Abstract
Abstract An improved method of manufacturing electroacoustic transducers which emp vibratile transducer elements includes an automatic method of measuring the motional impedance vs. frequency characteristics of a plurality of transducer elements and an automatic method of segregating the transducer elements into separate groups which are selected in accordance with the similarities of the measured motional impedance characteristics of the elements. The separate groups of selected transducer elements are then processed by changing a mechanical dimension of the elements in each separate group by a different specified amount which adjusts the motional impedance vs. frequency characteristic of each separate group to the same specified desired value. The processed transducer elements are then assembled into complete transducers, thereby achieving improved uniformity in the performance characteristics of the transducers which is obtained at relatively low cost.
Inventors
- 👤 Frank Massa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:05
CPC Classifications
H; H04; H04R; H04R29/00; H04R29/001; H04R29/004; H04R31/00; Y; Y10; Y10T; Y10T29/00; Y10T29/42; Y10T29/49; Y10T29/49002; Y10T29/49004; Y10T29/49005
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
220 words
A method for manufacturing electroacoustic transducers which incorporate in their design vibratile transducer elements which are required to operate within a specified frequency band in the vicinity of the resonant frequency region of said elements, including the following steps: (a) adjust at least one of the resonant frequency controlling dimensions of a plurality of transducer elements to a uniform specified value which is greater than the dimension necessary to achieve the specified resonant frequency for said plurality of transducer elements, (b) measure the motional impedance of each transducer element as a function of frequency over a frequency range which includes the resonant frequency region of the transducer element, (c) determine the frequency at which the motional impedance of each transducer element is a minimum, (d) segregate the transducer elements into separate groups in which each particular segregated group contains selected elements whose minimum motional impedance lies within a particular specified narrow frequency band assigned to the particular segregated group, (e) reduce the resonant frequency controlling dimension of the transducer elements within each particular segregated group by a prescribed specified amount to cause the frequency at which the minimum motional impedance occurs to change by the required amount needed to make the resonance frequency characteristics of all elements contained within each segregated group fall within the same specified operating frequency band.
Claim 2
Independent Claim
220 words
A method for manufacturing electroacoustic transducers which incorporate in their design vibratile transducer elements which are required to operate within a specified frequency band in the vicinity of the resonant frequency region of said elements, including the following steps: (a) adjust at least one of the resonant frequency controlling dimensions of a plurality of transducer elements to a uniform specified value which is greater than the dimension necessary to achieve the specified resonant frequency for said plurality of transducer elements, (b) measure the motional impedance of each transducer element as a function of frequency over a frequency range which includes the resonant frequency region of the transducer element, (c) determine the frequency at which the motional impedance of each transducer element is a minimum, (d) segregate the transducer elements into separate groups in which each particular segregated group contains selected elements whose minimum motional impedance lies within a particular specified narrow frequency band assigned to the particular segregated group, (e) reduce the resonant frequency controlling dimension of the transducer elements within each particular segregated group by a prescribed specified amount to cause the frequency at which the minimum motional impedance occurs to change by the required amount needed to make the resonance frequency characteristics of all elements contained within each segregated group fall within the same specified operating frequency band.
Claim 3
Dependent Claim
15 words
The invention in claim 1 characterized in that steps (b), (c), and (d) are automated.
Claim 4
Dependent Claim
35 words
The invention in claim 1 characterized in that said vibratile transducer element is a bi-laminar plate and further characterized in that the controlling dimension for the resonant frequency is the width of said bi-laminar plate.
Claim 5
Dependent Claim
15 words
The invention in claim 3 characterized in that said bi-laminar plate is a circular disc.
Claim 6
Dependent Claim
14 words
The invention in claim 3 further characterized in that said bi-laminar plate is square.
Claim 7
Dependent Claim
30 words
The invention in claim 5 further characterized in that the adjusted uniform specified dimensions of said plurality of bi-laminar square plates are the width dimensions of said bi-laminar square plates.
Claim 8
Dependent Claim
37 words
The invention in claim 6 further characterized in that the specified reduction in the frequency controlling dimension for each different segregated group of elements is a specified reduction in the width dimensions of said square bi-laminar plates.
Claim 9
Independent Claim
205 words
A method for manufacturing electroacoustic transducers which incorporate in their design vibratile transducer elements which are required to operate within a specified frequency band in the vicinity of the anti-resonant frequency region of said elements, including the following steps: (a) adjust at least one of the anti-resonant frequency controlling dimensions of a plurality of transducer elements to a uniform specified value which is greater than the dimension necessary to achieve the specified anti-resonant frequency for said plurality of transducer elements, (b) measure the motional impedance of each transducer element as a function of frequency over a frequency range including the anti-resonant frequency region of the transducer element, (c) determine the frequency at which the motional impedance of each transducer element is a maximum, (d) segregate the transducer elements into separate groups in which each particular group contains selected elements whose maximum motional impedance lies within a particular specified narrow frequency band assigned for the particular group, (e) reduce the anti-resonant frequency controlling dimension of the transducer elements within each particular segregated group by a particular specified amount necessary to cause the frequency at which the maximum motional impedance occurs for each different segregated group of elements to fall within the same specified operating frequency band.
Claim 10
Independent Claim
205 words
A method for manufacturing electroacoustic transducers which incorporate in their design vibratile transducer elements which are required to operate within a specified frequency band in the vicinity of the anti-resonant frequency region of said elements, including the following steps: (a) adjust at least one of the anti-resonant frequency controlling dimensions of a plurality of transducer elements to a uniform specified value which is greater than the dimension necessary to achieve the specified anti-resonant frequency for said plurality of transducer elements, (b) measure the motional impedance of each transducer element as a function of frequency over a frequency range including the anti-resonant frequency region of the transducer element, (c) determine the frequency at which the motional impedance of each transducer element is a maximum, (d) segregate the transducer elements into separate groups in which each particular group contains selected elements whose maximum motional impedance lies within a particular specified narrow frequency band assigned for the particular group, (e) reduce the anti-resonant frequency controlling dimension of the transducer elements within each particular segregated group by a particular specified amount necessary to cause the frequency at which the maximum motional impedance occurs for each different segregated group of elements to fall within the same specified operating frequency band.
Claim 11
Dependent Claim
15 words
The invention in claim 8 characterized in that steps (b), (c), and (d) are automated.
Claim 12
Dependent Claim
33 words
The invention in claim 8 characterized in that said vibratile transducer element is a bi-laminar plate and further characterized in that the anti-resonant frequency controlling dimension is the width of said bi-laminar plate.
Claim 13
Dependent Claim
15 words
The invention in claim 10 characterized in that said bi-laminar plate is a circular disc.
Claim 14
Dependent Claim
14 words
The invention in claim 10 further characterized in that said bi-laminar plate is square.
Claim 15
Dependent Claim
30 words
The invention in claim 12 further characterized in that the adjusted uniform specified dimensions of said plurality of bi-laminar square plates are the width dimensions of said bi-laminar square plates.
Claim 16
Dependent Claim
37 words
The invention in claim 13 further characterized in that the specified reduction in the frequency controlling dimension for each different segregated group of elements is a specified reduction in the width dimensions of said square bi-laminar plates.
References Cited (Backward Citations)
US4050126A
Cited
US4062154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |