US3660602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microphone cartridge with amplifier
Assignee: Conrac Corp
•
Filing: 1970-06-01
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Granted: 1972-05-02
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Expires: 1990-06-01
Abstract
Abstract The microphone of the invention obtains damping from a perforated baffle closely adjacent the diaphragm with fabric covering the perforations, and from resistive structures behind the baffle. The piezoelectric transducer element is mounted directly on a circuit board which also carries all electronic components of a preamplifier circuit.
Inventors
- 👤 Paul Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:02
CPC Classifications
H; H04; H04R; H04R17/00; H04R17/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
186 words
A microphone and amplifier unit, comprising in combination a generally cylindrical housing, open at one end to receive sound energy, a circuit board mounted transversely of the housing and having an outwardly opening central cavity, an elongated piezoelectric element responsive to bending stresses and having two opposite conductive longitudinal output faces, a conductive mounting surface on the outer face of the circuiT board adjacent the cavity, an electrically conductive spring clip having one portion rigidly mounted on the board and another portion resiliently engaging one face of the element to clamp the element with its other face engaging the mounting surface and with a free end extending unsupported over the cavity, a sound responsive diaphragm peripherally mounted in spaced relation outward of the circuit board, structure mechanically coupling the diaphragm to the free end of the element for driving the same, and an amplifying circuit including circuit components mounted on the circuit board and printed circuit connections on at least one board face interconnecting the components with said mounting surface and spring clip to supply the output of the element as input to the amplifying circuit.
Claim 2
Dependent Claim
186 words
A microphone and amplifier unit, comprising in combination a generally cylindrical housing, open at one end to receive sound energy, a circuit board mounted transversely of the housing and having an outwardly opening central cavity, an elongated piezoelectric element responsive to bending stresses and having two opposite conductive longitudinal output faces, a conductive mounting surface on the outer face of the circuiT board adjacent the cavity, an electrically conductive spring clip having one portion rigidly mounted on the board and another portion resiliently engaging one face of the element to clamp the element with its other face engaging the mounting surface and with a free end extending unsupported over the cavity, a sound responsive diaphragm peripherally mounted in spaced relation outward of the circuit board, structure mechanically coupling the diaphragm to the free end of the element for driving the same, and an amplifying circuit including circuit components mounted on the circuit board and printed circuit connections on at least one board face interconnecting the components with said mounting surface and spring clip to supply the output of the element as input to the amplifying circuit.
Claim 3
Dependent Claim
55 words
A microphone and amplifier unit as defined in claim 1, and including also a substantially rigid perforated baffle plate peripherally mounted on the housing between the diaphragm and circuit board with a central clearance aperture for said coupling structure, and air pervious fabric covering the perforations of the baffle plate for damping the diaphragm movement.
Claim 4
Dependent Claim
172 words
A microphone and amplifier unit, comprising in combination a generally cylindrical housing, open at one end to receive sound energy, a circuit board mounted transversely of the housing and having an outwardly opening central cavity, an elongated piezoelectric element responsive to bending stresses and having two opposite conductive output faces, structure mounting the element on the circuit board with a free end extending unsupported over the cavity, a sound responsive diaphragm peripherally mounted in spaced relation outward of the circuit board, a substantially rigid perforated baffle plate peripherally mounted between the diaphragm and the circuit board and having a central clearance aperture, structure extending in spaced relation through said clearance aperture for mechanically coupling the diaphragm to the free end of the element to drive the same, and an amplifying circuit including circuit components mounted on the circuit board and printed circuit connections on at least one board face interconnecting the components and cooperating with the element mounting structure to supply the output of the element as input to the amplifying circuit.
Claim 5
Dependent Claim
172 words
A microphone and amplifier unit, comprising in combination a generally cylindrical housing, open at one end to receive sound energy, a circuit board mounted transversely of the housing and having an outwardly opening central cavity, an elongated piezoelectric element responsive to bending stresses and having two opposite conductive output faces, structure mounting the element on the circuit board with a free end extending unsupported over the cavity, a sound responsive diaphragm peripherally mounted in spaced relation outward of the circuit board, a substantially rigid perforated baffle plate peripherally mounted between the diaphragm and the circuit board and having a central clearance aperture, structure extending in spaced relation through said clearance aperture for mechanically coupling the diaphragm to the free end of the element to drive the same, and an amplifying circuit including circuit components mounted on the circuit board and printed circuit connections on at least one board face interconnecting the components and cooperating with the element mounting structure to supply the output of the element as input to the amplifying circuit.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |