US3440363A - Shock-resistant microphone - Google Patents

Shock-resistant microphone Download PDF

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Publication number
US3440363A
US3440363A US509887A US3440363DA US3440363A US 3440363 A US3440363 A US 3440363A US 509887 A US509887 A US 509887A US 3440363D A US3440363D A US 3440363DA US 3440363 A US3440363 A US 3440363A
Authority
US
United States
Prior art keywords
bar member
transducer
force
shock
stress
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
Application number
US509887A
Other languages
English (en)
Inventor
Harry J Boll
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Application granted granted Critical
Publication of US3440363A publication Critical patent/US3440363A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/006—Transducers other than those covered by groups H04R9/00 - H04R21/00 using solid state devices

Definitions

  • an object of this invention is a shock-resistant electroacoustic transducer.
  • a more particular object is a stress limiting coupling between the acoustic-to-mechanical transducer and the mechanical-to-electrical transducer.
  • the invention is directed to electroacoustic transducers comprising an acoustic-to-mechanical transducer such as a diaphragm for changing sound energy to mechanical energy, a stress-sensitive electromechanical transducer for changing mechanical energy to electrical energy, and mechanical coupling means for transmitting force between these two transducers.
  • the intermediate force transmitting means provides that only forces below the level which would damage the electromechanical transducer are transmitted.
  • the invention is advantageously used with any stresssensitive transducer and particularly those of inherently fragile structure and susceptible to damage from shockinduced stresses.
  • Exemplary of such transducers are the types disclosed in Patents 3,137,834; 3,186,217, and application Ser. No. 80,672, filed Jan. 4, 1961, now Patent No. 3,270,554 all of W. G. Pfann and application Ser. No. 282,792, now Patent No. 3,312,790 filed May 23, 1963 of M. E. Sikorski; all of these disclosures being assigned to the assignee of this application.
  • An embodiment of an electroacoustic device in accordance with this invention comprises a mechanical linkage utilizing a double-fulcrumed bar upon which the stress responsive element is mounted.
  • the driving member of an acoustic diaphragm is connected to the free end of the double-fulcrumed bar which has one pivot point at the other end and a second pivot point near its middle.
  • a spring force is provided urging the bar against the fulcrum pivot points.
  • the stress responsive element is incorporated in the bar member near its middle where it is subject to the maximum bending moments applied from the diaphragm. Accordingly, deflection of the diaphragm resulting from the impact of sound energy produces bending of the bar member and induces an electrical response within the transducer element.
  • features of the device in accordance with this invention are its relative simplicity and ease of fabrication and adjustment.
  • FIGS. 1, 2 and 3 show in schematic form the basic portion of the shock-resistant arrangement in accordance with this invention.
  • FIG. 1 shows the normal or low stress condition of the apparatus during normal operation.
  • FIGS. 2 and 3 illustrate the condition of the device when the driving force and consequent deflection exceeds the normal limits, first in one direction and then in the other.
  • FIG. 1 shows simply the basic operating elements of the shock-resistant electroacoustic transducer in a form of illustration which corresponds to FIG. 2 of the above-referenced application. Accordingly, it will be understood that the device of FIG. 1 may be incorporated in, for example, a telephone handset as illustrated likewise in the reference application.
  • FIG. 1 shows a portion of a header 11 and a mounting disc 12.
  • a metal strip 14 is secured on the mounting disc and is linked by means of the leaf spring member 15 to the bar member 16.
  • the spring member 15 is secured at the one end to the metal strip 14 and at the other end to the bar member 16. This leaf spring member 15 thus constrains the bar member 16 and metal strip member 14 to stay in substantial alignment.
  • the ends of the metal strip member 14 substantially constitute the fulcrums or pivot points about which the bar member 16 may rock.
  • the bar member 16 is biased against these pivot points by the spring member 13 which is secured to the mounting disc 12.
  • the free end of the bar member 16 is attached by way of the connecting rod 20 to the dome member 21 which is an integral part of diaphragm 22 at its center.
  • an electro-mechanical transducer 17 Near the midpoint of the bar member 16, and particularly near a portion where the bending force is at its maximum, is an electro-mechanical transducer 17.
  • This transducer 17 has a pair of electrode connections 18 and 19 for transmitting the electrical signal therefrom in response to applied stress.
  • the bar member 16 rocks on its inner pivot point, and again avoids the application of excessive stress to the transducer 17.
  • the bar member 16 has an unsupported end subject to deflection by the applied force and a supported end which is fixedly supported until the applied force exceeds a certain value when it becomes resiliently supported.
  • the bar member 16 then is the vehicle for the application of stress to the electromechanical transducer element 17.
  • the device described above may be produced in a variety of forms and in exceedingly minute dimensions.
  • the techniques of microelectronics may be used to fabricate the members 14, and 16 and the transducer element 17.
  • the bar member 16 may be of silicon and the transducer element 17 may comprise a diffused resistor within the silicon bar.
  • the leaf spring 15, bonded at one end to the bar member 16 and at the other end to the metal strip 14, may be produced by masked metal evaporation and selective etching steps of the type disclosed in the application of M. P. Lepselter, Ser. No. 388,039, filed Aug. 7, 1964 and assigned to the same assignee as this application.
  • the device may be adjusted so that the bar member 16 lifts off one or the other pivot or hinge point at a value of applied force just below that which would otherwise result in overstressing and damage to the transducer 17.
  • the stress-sensitive transducer element 17 may be separated from the bar member 16.
  • the transducer element 17 may be mounted on a fixed base and force applied to it by means of a stylus attached to the bar member 16 at either fulcrum point.
  • the stress-sensitive transducer supports one of the fulcrums which in turn supports the bar member.
  • a shock-resistant electroacoustic transducer comprising, a first means for translating sound energy to mechanical energy, second means for trnaslating mechanical energy to electrical energy, third means for transmitting force from said first to said second means including a bar member having an unsupported first end and a supported second end, further including coupling means conmeeting said first means to said first end for transmitting force therebetween, and support means for said second end which is fixed when the force transmitted is just below that which would damage said second means, and which is resilient when the force is greater.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
US509887A 1965-11-26 1965-11-26 Shock-resistant microphone Expired - Lifetime US3440363A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US50988765A 1965-11-26 1965-11-26

Publications (1)

Publication Number Publication Date
US3440363A true US3440363A (en) 1969-04-22

Family

ID=24028504

Family Applications (1)

Application Number Title Priority Date Filing Date
US509887A Expired - Lifetime US3440363A (en) 1965-11-26 1965-11-26 Shock-resistant microphone

Country Status (4)

Country Link
US (1) US3440363A (forum.php)
BE (1) BE690020A (forum.php)
FR (1) FR1501584A (forum.php)
NL (1) NL6616641A (forum.php)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660602A (en) * 1970-06-01 1972-05-02 Conrac Corp Microphone cartridge with amplifier
US4230383A (en) * 1978-11-09 1980-10-28 Pittway Corporation Integral contact
WO2005027571A1 (en) * 2003-09-11 2005-03-24 New Transducers Limited Electromechanical force transducer
US20060207340A1 (en) * 2003-09-11 2006-09-21 New Transducers Limited Transducer
USD901459S1 (en) * 2020-07-15 2020-11-10 Yang Zhao Microphone pop filter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3377440A (en) * 1965-02-10 1968-04-09 Int Standard Electric Corp Rocking armature receivers
US3383475A (en) * 1965-09-08 1968-05-14 Euphonics Corp Microphone employing piezoresistive element
US3404243A (en) * 1964-09-09 1968-10-01 Siemens Ag Overload protection of pressure sensitive transducer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404243A (en) * 1964-09-09 1968-10-01 Siemens Ag Overload protection of pressure sensitive transducer
US3377440A (en) * 1965-02-10 1968-04-09 Int Standard Electric Corp Rocking armature receivers
US3383475A (en) * 1965-09-08 1968-05-14 Euphonics Corp Microphone employing piezoresistive element

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660602A (en) * 1970-06-01 1972-05-02 Conrac Corp Microphone cartridge with amplifier
US4230383A (en) * 1978-11-09 1980-10-28 Pittway Corporation Integral contact
WO2005027571A1 (en) * 2003-09-11 2005-03-24 New Transducers Limited Electromechanical force transducer
US20060207340A1 (en) * 2003-09-11 2006-09-21 New Transducers Limited Transducer
US7475598B2 (en) 2003-09-11 2009-01-13 New Transducers Limited Electromechanical force transducer
USD901459S1 (en) * 2020-07-15 2020-11-10 Yang Zhao Microphone pop filter

Also Published As

Publication number Publication date
BE690020A (forum.php) 1967-05-02
NL6616641A (forum.php) 1967-05-29
FR1501584A (fr) 1967-11-10

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