Patent US3814864A successfully refreshed from Google Patents.
US3814864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condenser microphone having a plurality of discrete vibratory surfaces
Assignee: Individual
•
Filing: 1972-07-14
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Granted: 1974-06-04
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Expires: 1992-07-14
Abstract
Abstract The diaphragm of a condenser microphone is broken up into many small pieces so that each attains a natural high frequency resonance above the range of sounds to be picked up with the sum total of the pieces providing an output as great as a single diaphragm with a lower impedance by providing a series of concentric ring contacts wih a diaphragm stretched over the rings, the highest points or ridges of which lie on a convex surface, to break up the diaphragm into annular sections.
Inventors
- 👤 J Victoreen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:36
CPC Classifications
H; H04; H04R; H04R19/00; H04R7/00; H04R7/16; H04R7/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
96 words
An electro-acoustic transducer having a vibratile conducting electrode and a fixed conducting electrode, the improvement in which comprises a surface on the fixed electrode having a plurality of projections which decrease in height from the midpoint outwardly toward the edge with the vibratile electrode stretched over the fixed electrode with said projections having ridges which are on a line having a convex curvature and whereby each point of contact provides substantially the same Amount of tension on the diaphragm as the other points and wherein said points are provided by annular grooves in a convex surface.
Claim 2
Dependent Claim
96 words
An electro-acoustic transducer having a vibratile conducting electrode and a fixed conducting electrode, the improvement in which comprises a surface on the fixed electrode having a plurality of projections which decrease in height from the midpoint outwardly toward the edge with the vibratile electrode stretched over the fixed electrode with said projections having ridges which are on a line having a convex curvature and whereby each point of contact provides substantially the same Amount of tension on the diaphragm as the other points and wherein said points are provided by annular grooves in a convex surface.
Claim 3
Dependent Claim
15 words
An apparatus as described in claim 1 wherein said grooves are concentric to each other.
Claim 4
Dependent Claim
15 words
An apparatus as described in claim 1 where said grooves are eccentric to each other.
Claim 5
Dependent Claim
15 words
An apparatus as described in claim 1 wherein said grooves are concave in cross section.
Claim 6
Dependent Claim
15 words
An apparatus as described in claim 1 wherein said grooves are square in cross section.
Claim 7
Dependent Claim
55 words
An apparatus as described in claim 4 wherein said concave grooves decrease in depth crosswise to their edges to the point of contact with the vibratile electrode to provide a decreasing acoustical friction from the edges toward the center and to provide mechanical damping and wherein the vibratile electrode is stretched over the fixed electrode.
Claim 8
Dependent Claim
26 words
An apparatus as described in claim 4 wherein a space is provided back of the fixed electrode and ducts communicate with the grooves and said space.
Claim 9
Dependent Claim
58 words
An apparatus as described in claim 1 wherein means is provided to adjust the position of the fixed electrode relative to the periphery of the vibratile electrode and wherein the vibratile electrode has a holding means at its periphery and wherein a housing is provided and the holding means of the vibratile electrode is engaged with the housing.
Claim 10
Dependent Claim
34 words
An apparatus as described in claim 8 wherein said housing has a cylindrical inner wall with an inwardly extending flange at one end and a ring is in threaded engagement with the other end.
Claim 11
Dependent Claim
31 words
An apparatus as described in claim 8 wherein said adjustment means includes a spring means between the fixed electrode and a support having a base is adjustably mounted in the housing.
Claim 12
Dependent Claim
25 words
An apparatus as descriped in claim 10 wherein said adjustment means is arranged to adjust the position of the fixed electrode relative to the base.
Claim 13
Dependent Claim
59 words
An apparatus as described in claim 9 wherein said holding means for the vibratile electrode is engaged with said flange and a base is provided for the fixed electrode and the fixed electrode is axially adjustable relative to the base and means is provided to hold said base in clamping engagement with the said holding means and said flange.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |