US4646873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microphone and acoustic equalizer therefor
Assignee: MARINE MIDLAND BANK NA A NATIONAL BANKING ASSOCIATION AS AGENT
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Filing: 1986-03-04
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Granted: 1987-03-03
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Expires: 2006-03-04
Abstract
Abstract An acoustic equalizer adapted for use with a microphone includes a resonator plate having front and back faces, a lip surrounding the plate and defining a first air cavity in the back face of the plate, and a plurality of apertures formed through the thickness of the plate, which apertures communicate with the first cavity. A boss is formed centrally on the front face of the plate. The boss is closed ended on one side and hollow interiorly to define a second air cavity. The first and second cavities communicate with each other through a central opening formed in the plate.
Inventors
- 👤 Michael A. Bryson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:07
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/222
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
276 words
A microphone and acoustic equalizer therefor, which comprises: a magnetic structure; a diaphragm adjacent to the magnetic structure; a voice coil operatively coupled to the diaphragm; means for supporting the diaphragm; a resonator plate having a front face and a back face opposite the front face, the resonator plate including a flat main body portion and an edge flange joined to the main body portion at the periphery thereof, the edge flange being offset axially from the main body portion to define a first air cavity in the back face of the plate, the edge flange being adapted to abut the periphery of the microphone diaphragm; the plate including a plurality of apertures formed through its thickness which communicate with the first air cavity; a first boss formed centrally on the front face of the plate and protruding outwardly therefrom, the first boss including a central opening formed axially through its thickness; a housing enclosing the magnetic structure, diaphragm, voice coil, diaphragm supporting means and resonator plate, the housing including a front cover plate disposed proximately to the resonator plate, the front cover plate having a front face and a back face opposite the front face, and a number of apertures formed through its thickness, the apertures of the cover plate being aligned with corresponding apertures of the resonator plate; and a second boss formed centrally on the front face of the cover plate and protruding outwardly therefrom, the second boss having a closed front end and being hollow interiorly to define a second air cavity of a predetermined volume, the second cavity communicating with the first cavity through the opening formed in the resonator plate.
Claim 2
Dependent Claim
276 words
A microphone and acoustic equalizer therefor, which comprises: a magnetic structure; a diaphragm adjacent to the magnetic structure; a voice coil operatively coupled to the diaphragm; means for supporting the diaphragm; a resonator plate having a front face and a back face opposite the front face, the resonator plate including a flat main body portion and an edge flange joined to the main body portion at the periphery thereof, the edge flange being offset axially from the main body portion to define a first air cavity in the back face of the plate, the edge flange being adapted to abut the periphery of the microphone diaphragm; the plate including a plurality of apertures formed through its thickness which communicate with the first air cavity; a first boss formed centrally on the front face of the plate and protruding outwardly therefrom, the first boss including a central opening formed axially through its thickness; a housing enclosing the magnetic structure, diaphragm, voice coil, diaphragm supporting means and resonator plate, the housing including a front cover plate disposed proximately to the resonator plate, the front cover plate having a front face and a back face opposite the front face, and a number of apertures formed through its thickness, the apertures of the cover plate being aligned with corresponding apertures of the resonator plate; and a second boss formed centrally on the front face of the cover plate and protruding outwardly therefrom, the second boss having a closed front end and being hollow interiorly to define a second air cavity of a predetermined volume, the second cavity communicating with the first cavity through the opening formed in the resonator plate.
Claim 3
Dependent Claim
43 words
A microphone and acoustic equalizer therefor, as defined by claim 1, wherein the housing further includes side walls joined to and extending from the front cover plate, and a beveled corner situated where the front cover plate is joined to the side walls.
Claim 4
Dependent Claim
30 words
A microphone and acoustic equalizer therefor, as defined by claim 1, wherein the resonator plate further includes a depression formed on its back face in alignment with the central opening.
Claim 5
Dependent Claim
49 words
A microphone and acoustic equalizer therefor, as defined by claim 1, which further includes a particle trap, the particle trap being formed of a woven mesh material, the particle trap being secured to the front face of the resonator plate and being dimensioned to cover the apertures formed therein.
Claim 6
Dependent Claim
47 words
A microphone and acoustic equalizer therefor, as defined by claim 1, which further includes a resonator damping, the resonator damping being formed of a woven mesh material, the resonator damping being secured to the first boss and dimensioned to cover the opening formed in the resonator plate.
References Cited (Backward Citations)
US2205670A
Cited
US2672525A
Cited
US3204031A
Cited
US3418427A
Cited
US4376232A
Cited
US4410770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |