US3660602A - Microphone cartridge with amplifier - Google Patents
Microphone cartridge with amplifier Download PDFInfo
- Publication number
- US3660602A US3660602A US42378A US3660602DA US3660602A US 3660602 A US3660602 A US 3660602A US 42378 A US42378 A US 42378A US 3660602D A US3660602D A US 3660602DA US 3660602 A US3660602 A US 3660602A
- Authority
- US
- United States
- Prior art keywords
- circuit board
- diaphragm
- circuit
- microphone
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000004744 fabric Substances 0.000 claims abstract description 8
- 238000013016 damping Methods 0.000 claims abstract description 5
- 238000005452 bending Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241000218645 Cedrus Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000010255 response to auditory stimulus Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
- H04R17/02—Microphones
Definitions
- the microphone of the invention obtains damping from a perforated baffle closely adjacent the diaphragm with fabric UNITED STATES PATENTS covering the perforations, and from resistive structures behind I Y the baffle.
- the piezoelectric transducer-element is mounted 2,791,64l 5/1957 Pye ..l79/I80 directly on a circuit board which also carries all electronic 3,130,275 4/1964 Hagey ..l79/l 10 A components ofa preamplifier circuit 3,497,731 2/l970 Straube...
- FIG. l isa-front' elevation' of a microphone unit illustrating the invention
- FIG. 2 is a-section at enlarged scale on line 2-'-2 of FIG. 1;
- FIG. 3 is a detail section on line -3 3of FIG. 2;
- FIG. is a rear elevation, partially broken away;
- FIG. -5- is a fragmentarysection on line-5-5of FIG. 2 at an intermediatescale;
- I FIG. 6 is a schematic diagram-representing illustrative circuitry. i g
- the illustrative microphone ⁇ unit shown in the drawings comprises a housing 10of generally cylindrical form, closed at its rearend by-the wall l2and open at its front end at the circular edge 13;
- the housing wall is-deformed inwardly at two diametrically opposite sectors, forming internal shelf structu're's 14 which face toward theopenend'of the housing, and also formingthe extemal recesses 162i
- the disk 20' of dielectric material is mounted on. the two shelf'formations 1-4 by the eyelets 22 and 23 which also serve to mount external terminal lugs Hand 25' in; the respective recesses 16 and to connect them electrically to-internal'circuit structure tov be more fully described.
- Theplasti'c bushings 27 insulate eyelets'22 from the housingg whichis typicallya unitary metal die casting.
- Disk 20' is thickenough to be substantially rigid, and forms with housing end wall 1 2 a chamber 26.;Th'e'centra1 apertures 18 and 28 in housing wall l2and disk 20' ⁇ respectively, are covered by the pads 19 and 29" which' breathe sufficiently'to equalize atmospheric pressure; while sealingchamber 26 acoustically and: against--foreignmatter.
- aperture 28' and. pad- 29, form an acoustic resistance, and are of utility in shaping and controlling frequency response of the microphone.
- the degreeof'thatdamping action isreadily controllable by suitable'selection of such factors as the ratio ofbafile perforations to solid area, the bafile spacing from the diaphragm and the penneability of the fabric.
- the transducer proper comprises a piezoelectric ceramic element 50 of bar form with its two active'longitudinal faces suitable mate'rialKfo'r those pads is the synthetic unw'oven fabric sold under the tradename Viskon.
- the soundresponsive diaphragm 30 is slightly conical and is mounted against the front edge of the housing and is cemented thereto with-a suitable adhesive.
- the diaphragm and moisture barrier are clamped'firmly in place by the gasket- 34 and the metal 'grille 36, the periphery of which is of cup form and grips the external housing flange 35.
- the rigid metal bafile40 is of shallow conical form, closely matching the shape ofthe ;diaphragm,,and is mounted inward of the diaphragm in paralleland closely spaced relation.
- Baffle 40- is seated on-the 'intemalhousing flangedl and is retained by adhesive 43. It is generously perforated as indicated at 42.
- An air pervio'usfabric 44,- such as light silk cloth, is adhered to a face of the baffle',-covering perforations 42 and-offering a selected degreeof friction to airpassage through those perforations.
- Diaphragm vibration. in response to sound is damped by-the energy .loss-thataccompanies airCmovement coated with silver to render them conductive.
- Piezoelectric element 50 is ofatype that generates'an electrical potential between its conductivefaces when stressed by bending. Elev ment 50i's mounted onthe front face-of disk 20, oneend of the element-being held'effectively rigidly and the other end projecting freely and essentially radially into the central clearance aperture 28of the disk. That free end of element 50 is coupled to the center of diaphragm 30 by the drive pin 54, which projects inv spaced relation through the central clearance aperture 46. in baffle 40.
- One end of pin 54 is mounted semi-rigidly at the diaphragm apex by a drop of suitable adhesive 55; Theother end of the pin has an aperture which is pressed with a force fit over'the free end of element 50; which it grips firmly.
- the electrical output signal from transducer element 50 is amplified by a suitable solid state amplification circuit incorporated in the microphone cartridge.
- An'illustrative circuit for that purpose is shown in schematic form at 60 in'FlG. 6, comprising the two ,transistors Qland Q2, directly coupled via the resistance R3.
- the amplified microphone output at tenninals 24 and 25 is shunted by capacitance C1, to bypass unwanted radio frequency energy often present when the microphone is used to modulate radiotransmitters.
- the dashed lines 72 in FIG. 6 represent -a flexible cable connecting the microphone cartridge output terminals 24 and 25 .to the, remainder of the electrical system.
- That system includes a power supply, indicated in schematic and illustrative form at A direct current power source is indicated at B, with the resistance R6, which acts as load impedance for transistor Q2.
- the terminals 74 and75 supply the microphone output to further amplification circuitry, forming part of the system remote from the microphone cartridge and typically of conventional design.
- - amplification circuitry 60 is constructed as a self-contained unit mounted on disk 20, already described, and including printed circuit connective elements formed directly on that disk as a circuit board.
- Disk 20 thus serves not only as mechanical support and electrical means of connection for transducer element' 50, but also as mounting support and essentially an integral part of the circuitry for amplifying the output from that transducer.
- the various circuit components are mounted on the rear face of circuit board 20, so that in the assembled cartridge theyare contained within chamber 26.
- Those components are connected to form an amplifying circuit primarily by means of a conductive coating deposited in definitely predetermined configuration on the front face of circuit board 20, typically utilizing known printed circuit techniques.
- the wire leads originally provided on each circuit component typically project through small holes 82 in the circuit board and are connected to the printedcircuit coating by solder.
- the detailed arrangement of the components, and the exact configuration of printed circuit elements will depend, of course, upon the selected amplifying circuit.
- FIGS. 2 and 5. An illustrative circuit arrangement is shown in somewhat fragmentary form in FIGS. 2 and 5.,Qwhere the circuit components that are mounted behind circuit board 20 are represented in FIG. 2 by R3 and Q2, and in FIG. 5 by R2, R3, Q1 and Q2 (shown in dotted lines), other components being omitted for clarity of illustration.
- transistor Q has its respective terminals connected to printed elements a, 80b and 80c, while resistor R2 is connected between elements 80c and 80e.
- Printed elements 80d and 80e surround the holes in which mounting eyelets 22 and 23 are secured, and form electrical output connections via those eyelets to the respective output tenninals 24 and 25, already described.
- a particular feature of the present invention concerns the manner of mounting ceramic piezoelectric transducer element 50. That element is .coated on its two working side faces in conventional manner with a conductive metal film. The mounted end of element 50 rests directly on printed circuit element 80a, with one of its coated faces making direct electrical contact with that element. The transducer is held effectively rigidly in that position by a spring which also makes electrical connection with the opposite coated face of the ceramic element.
- that spring 90 includes two spring arms 91 which are anchored at one end and have their opposite ends joined by the elongated bar portion 92. That bar is longitudinally corrugated to make it effectively rigid. The center of the corrugation rests on the ceramic element, securely clamping it to the circuit board and in reliable electrical contact with printed surface element 80a.
- the two anchored spring ends 91 rest directly on printed circuit element 80b and are secured by the eyelets 94, maintaining reliable electrical contact between the ceramic element and the circuit component Q1, for example.
- the entire amplifying circuit 60 is mounted on circuit board 20 together with transducer element 50, clamping spring 90 and driving pin 54.
- the electrical system can then be tested as a unit to any desired extent before mounting the circuit board in the housing.
- the circuit board assembly is mounted in the housing, secured by eyelets 22 and 23 and sealed around its periphery with suitable sealant 93.
- Baffle 40 is then installed and diaphragm 30 is added, with pin 54 projecting through a small clearance hole at the center of the diaphragm. Only then is the pin coupled to the diaphragm by adhesive 55. That procedure relieves axial tolerances and insures unstrained equilibrium position of the moving parts.
- a microphone and amplifier unit comprising in combination a generally cylindrical housing, open at one end to receiv sound energy
- circuit board mounted transversely of the housing and having an outwardly opening central 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
- an amplifying circuit including circuit components mounted on the circuit board and printed circuit connecv tions 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 amplify- I ing circuit.
- a microphone and amplifier unit comprising in combination a generally cylindrical housing, open at one end to receive sound energy, a circult board mounted transversely of the housing and having an outwardly opening central cavity,
- a substantially rigid perforated baffle plate peripherally mounted between the diaphragm and the circuit board and having a central clearance aperture
- 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.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US4237870A | 1970-06-01 | 1970-06-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3660602A true US3660602A (en) | 1972-05-02 |
Family
ID=21921598
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US42378A Expired - Lifetime US3660602A (en) | 1970-06-01 | 1970-06-01 | Microphone cartridge with amplifier |
Country Status (5)
Country | Link |
---|---|
US (1) | US3660602A (xx) |
JP (1) | JPS5126067B1 (xx) |
BE (1) | BE767956A (xx) |
CA (1) | CA929656A (xx) |
DE (2) | DE7120774U (xx) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3872470A (en) * | 1973-04-18 | 1975-03-18 | Airco Inc | Audible signal generating apparatus having selectively controlled audible output |
US3947647A (en) * | 1974-03-21 | 1976-03-30 | E. F. Johnson Company | Microphone having improved transducer support |
US4035672A (en) * | 1975-02-06 | 1977-07-12 | Cts Corporation | Acoustic transducer with a dual purpose piezoelectric element |
US4113999A (en) * | 1975-11-20 | 1978-09-12 | Warren A. Sturm | Hand held communications microphone |
US4156800A (en) * | 1974-05-30 | 1979-05-29 | Plessey Handel Und Investments Ag | Piezoelectric transducer |
US4354131A (en) * | 1979-08-15 | 1982-10-12 | Toyota Jidosha Kogyo Kabushiki Kaisha | Sensor with cross-base mounting plate |
US4449236A (en) * | 1982-04-08 | 1984-05-15 | Walker Equipment Corporation | Anti-side tone transmitter |
US4584702A (en) * | 1983-12-19 | 1986-04-22 | Walker Equipment Corporation | Noise cancelling telephone transmitter insertable in telephone handset receptacle |
US4692942A (en) * | 1984-10-30 | 1987-09-08 | Thomson Csf | Electroacoustic transducer with piezoelectric diaphragm |
US5377273A (en) * | 1992-03-26 | 1994-12-27 | Hewlett-Packard Company | Batteryless power supply for transducers |
US20020097887A1 (en) * | 2000-05-26 | 2002-07-25 | Marcel Gavriliu | Resonant frequency adjustment using tunable damping rods |
WO2008087630A3 (en) * | 2007-01-15 | 2010-01-07 | Baran Advanced Technologies (86) Ltd. | A method for the fully automated production of a piezoelectric switch and a process therefor |
US20150139457A1 (en) * | 2012-06-06 | 2015-05-21 | Nec Casio Mobile Communications, Ltd. | Speaker device and electronic device |
USD901459S1 (en) * | 2020-07-15 | 2020-11-10 | Yang Zhao | Microphone pop filter |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS534453U (xx) * | 1976-06-30 | 1978-01-17 | ||
FR2531299B1 (fr) * | 1982-08-02 | 1986-07-18 | Depaepe Sa Henri | Transducteur acousto-electrique, notamment pour microphone piezoelectrique |
FR2643772B1 (fr) * | 1989-02-27 | 1991-06-07 | Horlogerie Photograph Fse | Capsule piezoelectrique a portee plane et organes de maintien elastiques |
FR2643771A1 (fr) * | 1989-02-27 | 1990-08-31 | Horlogerie Photograph Fse | Capsule piezoelectrique a organes de maintien elastiques conducteurs |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2791641A (en) * | 1955-08-19 | 1957-05-07 | Gen Telephone Lab Inc | Telephone receiver |
DE1076182B (de) * | 1957-02-21 | 1960-02-25 | F & H Schumann G M B H | Filteranordnung fuer elektro-akustische Wandler |
US3130275A (en) * | 1962-10-15 | 1964-04-21 | Electro Voice | Microphone |
US3440363A (en) * | 1965-11-26 | 1969-04-22 | Bell Telephone Labor Inc | Shock-resistant microphone |
US3497731A (en) * | 1967-09-19 | 1970-02-24 | Gen Dynamics Corp | Bender type transducers |
US3564303A (en) * | 1968-10-07 | 1971-02-16 | Westinghouse Electric Corp | Encapsulated transducer assembly |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4222077Y1 (xx) * | 1965-12-28 | 1967-12-16 | ||
JPS453072Y1 (xx) * | 1966-03-31 | 1970-02-10 | ||
JPS426962Y1 (xx) * | 1966-11-08 | 1967-03-31 |
-
1970
- 1970-06-01 US US42378A patent/US3660602A/en not_active Expired - Lifetime
-
1971
- 1971-05-28 DE DE19717120774U patent/DE7120774U/de not_active Expired
- 1971-05-28 DE DE19712126556 patent/DE2126556A1/de active Pending
- 1971-06-01 CA CA114473A patent/CA929656A/en not_active Expired
- 1971-06-01 JP JP46038192A patent/JPS5126067B1/ja active Pending
- 1971-06-01 BE BE767956A patent/BE767956A/xx unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2791641A (en) * | 1955-08-19 | 1957-05-07 | Gen Telephone Lab Inc | Telephone receiver |
DE1076182B (de) * | 1957-02-21 | 1960-02-25 | F & H Schumann G M B H | Filteranordnung fuer elektro-akustische Wandler |
US3130275A (en) * | 1962-10-15 | 1964-04-21 | Electro Voice | Microphone |
US3440363A (en) * | 1965-11-26 | 1969-04-22 | Bell Telephone Labor Inc | Shock-resistant microphone |
US3497731A (en) * | 1967-09-19 | 1970-02-24 | Gen Dynamics Corp | Bender type transducers |
US3564303A (en) * | 1968-10-07 | 1971-02-16 | Westinghouse Electric Corp | Encapsulated transducer assembly |
Non-Patent Citations (1)
Title |
---|
Carlson, A Wideband Miniature Microphone, Journal of the Audio Engineering Society, p. 631 635. * |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3872470A (en) * | 1973-04-18 | 1975-03-18 | Airco Inc | Audible signal generating apparatus having selectively controlled audible output |
US3947647A (en) * | 1974-03-21 | 1976-03-30 | E. F. Johnson Company | Microphone having improved transducer support |
US4156800A (en) * | 1974-05-30 | 1979-05-29 | Plessey Handel Und Investments Ag | Piezoelectric transducer |
US4035672A (en) * | 1975-02-06 | 1977-07-12 | Cts Corporation | Acoustic transducer with a dual purpose piezoelectric element |
US4113999A (en) * | 1975-11-20 | 1978-09-12 | Warren A. Sturm | Hand held communications microphone |
US4354131A (en) * | 1979-08-15 | 1982-10-12 | Toyota Jidosha Kogyo Kabushiki Kaisha | Sensor with cross-base mounting plate |
US4449236A (en) * | 1982-04-08 | 1984-05-15 | Walker Equipment Corporation | Anti-side tone transmitter |
US4584702A (en) * | 1983-12-19 | 1986-04-22 | Walker Equipment Corporation | Noise cancelling telephone transmitter insertable in telephone handset receptacle |
US4692942A (en) * | 1984-10-30 | 1987-09-08 | Thomson Csf | Electroacoustic transducer with piezoelectric diaphragm |
US5377273A (en) * | 1992-03-26 | 1994-12-27 | Hewlett-Packard Company | Batteryless power supply for transducers |
US20020097887A1 (en) * | 2000-05-26 | 2002-07-25 | Marcel Gavriliu | Resonant frequency adjustment using tunable damping rods |
US7212644B2 (en) * | 2000-05-26 | 2007-05-01 | California Institute Of Technology | Resonant frequency adjustment using tunable damping rods |
WO2008087630A3 (en) * | 2007-01-15 | 2010-01-07 | Baran Advanced Technologies (86) Ltd. | A method for the fully automated production of a piezoelectric switch and a process therefor |
US20150139457A1 (en) * | 2012-06-06 | 2015-05-21 | Nec Casio Mobile Communications, Ltd. | Speaker device and electronic device |
USD901459S1 (en) * | 2020-07-15 | 2020-11-10 | Yang Zhao | Microphone pop filter |
Also Published As
Publication number | Publication date |
---|---|
JPS5126067B1 (xx) | 1976-08-04 |
DE7120774U (de) | 1973-01-18 |
CA929656A (en) | 1973-07-03 |
DE2126556A1 (de) | 1971-12-09 |
BE767956A (fr) | 1971-12-01 |
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