US2184064A - Transmitter cell - Google Patents

Transmitter cell Download PDF

Info

Publication number
US2184064A
US2184064A US162253A US16225337A US2184064A US 2184064 A US2184064 A US 2184064A US 162253 A US162253 A US 162253A US 16225337 A US16225337 A US 16225337A US 2184064 A US2184064 A US 2184064A
Authority
US
United States
Prior art keywords
electrode
base member
cup
insert piece
cell
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
US162253A
Other languages
English (en)
Inventor
Albert E Woodruff
Albert F Horlacher
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.)
Associated Electric Laboratories Inc
Original Assignee
Associated Electric 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
Priority to BE431283D priority Critical patent/BE431283A/xx
Application filed by Associated Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc
Priority to US162253A priority patent/US2184064A/en
Application granted granted Critical
Publication of US2184064A publication Critical patent/US2184064A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/14—Throat mountings for 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
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material

Definitions

  • the present invention relates to transmitter cells and more particularly to cells of this character which are, inv operation, Aresponsive "to ree ceived mechanical vibrations as contrasted to 5 transmitter cells of conventional form which respond to sound waves transmitted thereto.'
  • the type of transmitter cell noted which usually comprises a vibratory structure including a diaphragm directly exposed to the mechanical lll vibrations representing theintelligence or speech to be transmitted, possesses certain desirable operating characteristics when used for the transmission of sech by wire or radio from an area in which the background noise is exceptionally 11d high.
  • One such application which readily Asug ⁇ - gests itself relates to ⁇ .the'transmission of speech by radio from a radio transmitter carried in the cockpit of an airplane.
  • the vibratory diaphragm thereof is usually supported directly against the throat of the wearer or user so that it respondsto the muscular vibration of the wearers throat during speech.
  • the background noises are w substantially eliminated and only the mechanical vibrations of the diaphragm caused by the speech of the user are transformed into electrical undulations for modulation on the carrier transmitted from the associated radio 'transmitting s@ apparatus.
  • the mechanically responsive transmitter cell has not' been extensively used in applications of the type just referred to for the reason that the previously known cells of this form have not 35 been characterized by any substantial degree of sensitivity, as regards the response characteristic thereof, and have been of a cumbersome and relatively expensive construction.
  • v(ci. 11s- 122) member is av structure for retaining therein a granulated carbon pile, which structure comprises a pair of rigid, cup-shaped electrodes, one of which is supported by the base member, and the other of which is oppositely disposed with 5 respect to theiirst electrode and is connected to Athe bottom portion of the cup-shaped member for vibration therewith.
  • This structure also includes a flexible member connecting the oppositely disposed rims ofthe two electrodes to'complete the 10 enclosure for the carbon piln
  • a flexible member connecting the oppositely disposed rims ofthe two electrodes to'complete the 10 enclosure for the carbon piln
  • FIG. 1 is a cross sectional viewillustrat- ⁇ ing a transmitter cell constructed and arranged in accordance with thev present invention.
  • Fig. 2 is a plan view of a portion of the cell shown ⁇ in Fig. 1, and liig. 3 is an exploded view illustrating the manner of assembling the elements of the cell as shown in Figs. l and 2.
  • a transmitter cell having embodied therein the features of the present invention as comprising a cylindrical base member .I0 constructed of insulating material,.a cup-shaped member Il,
  • the bottom portion of the base member lil is provided with an annular depression i3 45 which is adapted to accommodate the end of a flexible supporting member, not shown, forming a part of an improved microphone supporting assembly which is described and claimed in the present applicants' co-pending application S. N. 50
  • the narrowed ,lengthl A of the flexible supporting member rests in a 'slot il extending from the depression I3 exteriorly of the base member Ill.v
  • the base member I For thepurpose of retaining the end of the flexible supporting memon the base member I by means comprising,
  • a cover plate I5 which is adapted to be mounted screws I6 threaded into ⁇ metal inserts I1 molded into the base member Il.
  • the rim portion of the side wall of the cupshaped member Il is cut flat across so that the surface thereof engages at substantially all points thereof vthe upper flat sealing. surface of the base member I0. Integral with and extendf member to prevent the same from being crushed i in character.
  • thesurface of the rim of the member II and-the inner wall surfaces thereof are secured to the oppositely disposed surfaces of the base member I0 lby bonding the same thereto with cement.
  • cemen is used in a generic sense to denote, any form of compound having the necessaryeadhesive qualitl'esrrmly to hold the member II secured to the base member Ill.
  • This.. method of attachment possesses distinct advantages in that it 4insures an extremely tight joint which prevents -the entrance of foreign matter interiorly of the cliamber formed between the members I0 andv I I, it enhances the pleasing appearance of the cell, and
  • the cup-shaped member II is provided with a thin walled bottom portionor 'end wall Il adapted to function as a vibrating diaphragm responsive to the audio-frequency muscular vibrations of the body of a user when the device is attached to the throat of a wearer or user.
  • This portion I8 has extending inwardly therefrom a projection I9' forming a part of the connection between the diaphragm portion of the member II and one electrode -of the structure I2. It has been found Athat the responsivenessiof they cell is considersubstantially from they center of this portion and approaching the side walls'of the cup-shaped member II in the manner illustrated.
  • the member II is ypreferably constructed of cellulose'acetate material which, ras is well known, is transparent Such material is welLsuited for this particular use in that the ratio between its elasticity and massis relatively high and it is thus possessed of the one characteristic which is highly desirable in a diaphragm material. Moreover, this material is practically indestructible when subjected to the handling accompanying ordinary usage of the cell.
  • This projection is providedl at its lower end with a flat surface which is bonded to theoppositely disposed flat surface forming the bottom of the Walled portion 22 of the insert piece 2L
  • bonding is accomplished through the use of cement or glue having the requisite adhesive qualities rigidly to secure the electrode I9 to the portion Il of the member II for vibration therewith.
  • the oppositely disposed electrode 29 is seated in a depression provided in the centralportion of the base member I0 and conforming in contour to the contour of the outer surface of the electrode. This last-mentioned electrode, like the electrode I9.
  • This insert piece 24 is provided with a flange 24' which abuts the surface adjacent the upper edge of the opening in the electrode 20 and the edge of the opposite end thereof is spun pver to engage the surface adjacent the', lower edge of the' opening in the member I0.
  • vIhe opening through the insert piece 24 serves for the introduction of granulated carbon into the enclosure formed bythe two oppositely disposed by a ⁇ cap 25 seated in'a circular depression axially coincident with v'the vopening in the insert piecev 24 and clamped in position by a projection from the bottomvplate I5.
  • vThe structure I2 is 26 constructed of paper or like material and having a number of reversely folded sections so constructed as to form a lbellows having itsv opporims of the electrodes I9 and 20.
  • the vibratory structure includlng the bottom portion I9 of the memberll and the electrode I9 is left free to vibrate in accordance with the mechanical vibrations Vimpressed thereon, thereby to vary thefresistance oi' the carbon pile enclosed within the structure I2 without an excessive amount of damping.
  • Each of the two electrodes I9 and 20 is preferablyconstructed of a compressed mixture of granulated carbon and a suitable binder material. As thus formed, the electrodes are not susceptible of permanent distortion due to mechanical forces impressed thereon during rough handling. Moreover, the carbon constituent of the electrodes enhances the electrical contact between each of lthe electrodes and the granulated carbon in the carbon pile', thus improving the electrical characteristics of the cell.
  • the circuit conductor 23 terminating at the electrode I9 is connected to ametal insert piece 2.1 molded in the base member I0, which insert piece forms one of the terminals of the ,cell Similarly, the stationary electrode 29 is connected, by means comprising a conductor element 29, to an insert piece 28 molded into the base member I0.
  • the element 29 is provided ⁇ with an annular portion 30 which encircles the electrode 20 and is clamped between the outer 7 edge of the insert piece 2d is then spun rover,A
  • Electrode Eil is iirst positioned in its accommodating depression provided in the base member It,
  • theflat surface of the projection i9 may be pressed firmly against the engaging surface of the insert 2
  • the at rim surface of the member il is cemented or bonded to the iiat surface of the base member I0 in order to provide a seal therebetween.
  • said strucire including an electrode supported by said base member, and an electrode 'connectedeto the end wall of said cup-.shaped ,o memberA for vibration therewith.
  • a transmitter cell comprising, in combination, a base member provided with a sealing surface, a cup-shaped member including a side wall provided with a rim secured and sealed to the sealing surface of said'fbase member, said cupshaped member having a thin end wall provided with a continuous outer surface and adapted to function as a vibrating diaphragm responsive to the audiofrequency muscular vibration of the body of a wearer, the end wall of said cup-shaped fmember carrying an integral and inwardly extending projection substantiallyat the center thereof, and a structure positioned between the end wall of said cup-shaped member and said base member for retaining therein a granulated carbon pile, said structure including an electrode supported by said base member, a second electrode .having an opening therein, and an insert piece extending through said opening, said insert projection carried by the end wall of said cupshaped member being arranged within the hollowed portion of said insert' piece and being bonded to said insert piece by cement, thereby to connect said second electrode to the end wall of said cup-shaped member for vibration therewith.
  • L'A transmitter cell comprising, in combination, a base member, a cup-shaped member having its rim bonded to the surface of said base said base member having an opening therein, and
  • a structure positioned between the bottom portion of said cup-shaped member and said base member for retaining therein a granulated carbon pile, said structure including a pair of electrodes, said electrodes each having an opening therein and being composed of a compressed mixture of granulated carbonvand a binder material, a vhollow metal insert piece extending through the opening in said base member and the opening in one of.
  • said electrodes said-insert piece having a flange at one edge and being spun over at its other edge to secure said one electrode to said base member, the opening in-said insert piece serving for the introduction of granulated carbon into said structure, and a second metal insert piece extending through the opening in the second of said electrodes, said second insert piece having a ilangeabutting the inner surface ⁇ of said secondV electrode and' a walled-portion spun over the outer edge of the opening throughwhich it extends, said projection extending within the walled portion of said second insert piece and being bonded thereto by cement, thereby to connect said second electrode to the bottom portion of said cup-shaped member for vibration" tnerewmi.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
US162253A 1937-09-03 1937-09-03 Transmitter cell Expired - Lifetime US2184064A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE431283D BE431283A (en)van) 1937-09-03
US162253A US2184064A (en) 1937-09-03 1937-09-03 Transmitter cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US162253A US2184064A (en) 1937-09-03 1937-09-03 Transmitter cell

Publications (1)

Publication Number Publication Date
US2184064A true US2184064A (en) 1939-12-19

Family

ID=22584835

Family Applications (1)

Application Number Title Priority Date Filing Date
US162253A Expired - Lifetime US2184064A (en) 1937-09-03 1937-09-03 Transmitter cell

Country Status (2)

Country Link
US (1) US2184064A (en)van)
BE (1) BE431283A (en)van)

Also Published As

Publication number Publication date
BE431283A (en)van)

Similar Documents

Publication Publication Date Title
US4063049A (en) Piezoelectric electroacoustic transducer
US3059720A (en) High frequency loudspeakers
US2718563A (en) Microphone
US3496307A (en) Loudspeaker
US3725584A (en) Acoustic coupler
US2621751A (en) Earcap for earphones
US2042822A (en) Telephone transmitter
US2458158A (en) Magnetically shielded electrodynamic sound reproducer
US2184064A (en) Transmitter cell
GB720072A (en) Magnetic insert earphone and ear inserts therefor
US2564562A (en) Microphone
US2542922A (en) Loud speaking telephine instrument
US3188374A (en) Loudspeaker assembly
US2451317A (en) Microphone adapted to be actuated by a bone structure of a user
GB899474A (en) Improvements in or relating to electroacoustic transducers
US2353089A (en) Transducer
US1932581A (en) Microphone
DE3261598D1 (en) An electroacoustical transducer and a method for assembling same
US2252748A (en) Transmitter headset
US1655625A (en) Piezo-electric device
US2152915A (en) Telephone instrument
US2176293A (en) Telephone transmitter device
US2141949A (en) Loudspeaker
JPS6342630Y2 (en)van)
US2847520A (en) Damped microphone