US1432885A - Telephone transmitter - Google Patents

Description

J. P. MINTON TELEPHONE /APPLICATION FILED MAR. 2T, 1918.

AND C. A. FINLE-Y.

TRANSMITTER.

- Patented 0st. 241. 31922.

TOEN l. MINTDN. 0F EAST ORANGE. NEW JERSEY, .AND CHARLES A. FINLEY. 0F

BROOKLYN, NEW YORK.. ASSIGNORS TO WESTERN ELECTRIC COMPANY. NCOR- EGE-ATER GI NEW- EQRK, Yi. A CORPORATION OF NEW YRK.

TELEIEHGNE TRANSMITTER.

.Application filed Marc-n 27, 1818. Serial No. 224,981.

lie it known that We, .imm l). iliiNToN and (unimaas A. Finney, citizens of the United States, residing at East Orange, in the county of Essex and Stute ot New Jersey, and at Brooklyn, in the county of Kings and State of New York, respectively, have invented certain new and useful improvements in Telephone Transmitters, of which the following is a. full, clear, concise, and exact description. f

This invention relates in general to tel phone transmitters, and more specifically a transmitter particularly suitable for u in places subjected to severe extraneous noises or to vibrations set up by the rush of Wind.'

i in many cases it is importent that a transmitter be provided which 'will be sensitive and eihcient in operation and yet one which will not be interfered with by excessive noises or violent explosions occurringY close by. Such are the requirements, ior example, for a, transmitter 'to be used in connection with telephone sets on aeroplanes for rommnnicaftion between the pilot und the obrer or 'for Wireless communication with .aber stations. llnder siich cond ons the violent disturbances set up by 'the exhaust of the engines and the rush oi"l air malle di i l le,

e.. to

recraudible conversation impossi. und it luis been necessary resort to i use oil teleplii'ines for communication. However. to 'nin satisfactory transmission it has lu reto-i'ore been necessary to shield tbe transmitter by mount-ingr it in a. practically sound proof box into which the use-r musi thrust, his face vvlen talking'. Such an arrangement .is not only awkward and cumbersome but quite likely to interiore with the other duties or" the user, as Well as obstruct his vision. Again, for use with-lire control on bati'lesbips or land fortifications, there is de ined need for a transmitter which will easily and. intelligibly transmit speech in spire oi the if'iolent. concussione due 'to the discharge 'oi batteries nearby.

it is thereiori he object oi tli present in.- "fention to pr: 'i 'le a 'telephone transmitter which will not be susceptible to disturbingnoises or .i'l'iistlingg' resulting; from the action ci the Wind when the transmitter is exposed i the open, or to the rush of one which will be efficient in transmission,

cheap of manufacture and -Which will be free from all delicate adgustments necessitating expert attention.A

To accomplish the above objects :i feature of the present invention resides in equipping a transmitter with a face plate in which are provided a plurality of holes or pcrlioraiions small in diameter.

Another 'feature consists in providing a very small rcsonatingr chamber7 that is. mii-l:- ing' the clearance between the diapliragn. and the iace plate very small to further aid in preventing outside disturbances aii'ecting the diaphragm.

Other objects and features of the invention will loe apparent from the following description, und will be particularly pointed out in the appended claims.

The .invention is illustrated in the accompanying drawing' in which Fig. l is uA sectional vieu of a transmitter embodying this invention; and Fig. 2 isa front' View of 'the trani-imiter shown in Fig. l and having a portion oi. the iace plate" removed to more" clearly shon the internal construction.

Referring now to the drawing, there is provided a casingF 5 to Whichtloe face late il is secured by means of screws 7"?. lince the tace plete and casing' are preferably made of aluminum, it has been found advisable to employ shouldered studs 8 8 of German silver or similar material and threaded to receive the screws 7-7. The rinz;r 9 is clamped between the face plate 6 and the casing The face plate 6 is perforated with a large number of evenly distributed perforations l010 which are small in diameter in comparison with the thickness of the face plate. in practice, it has been oundthat very satis-:Factor i results are obtained when the diameter oil these per- ;'oiations is .O50 inches or less. and the thickness of the face 'plate is not less than oneeighth oi an inch. The inner side of the face plate is counter-bored to receive the dia- Y.. in.

Lion of he' bridge-came? Li- :md-61h@ mica Wa'im l' is a mslnl plaie l?? having am 2X- imfeii portion provided Wilh he iisfliinai screw iii), The hi'idge cents? is bored mit o rifive the shank of :i standar@ type of transmita' button Qhziprsing :l cup mem.-

ih piace by mit ammini; mi] .I'esiiicfr@ @Minimum would i? i iiiiiii, L.

HNiziiCiiiUg with plais.

2i. in. ii, iifim-lmii" :i ihzii'lh'nggm mi: im? piatti w WKN 1 1 minuten my it; heling a i f 5. n a transmitter, a face nlate havin a plurality of small openings therethrougi\1 the diameter off Said perforations being' less than the thickness of the face plate; and a diaphragm,'spaced adjacent thereto but separated therefrom to provide a thin i'esenating' ithamber having; a depth not greater than .O15 inches communicating' with the openings in said vface plate.

6. 1n a transmitter, a easing, a transmitter 'button having` a cup member in lwhich are located thefront and back electrodes practically fiiled with granular carbon', means for snpponting said button in said casing a diaphragm hating a high natural period., spring means for maintaining said hutten in engagement with said diaphragm, and Jface plate having a plurality of small openings whereby Violent Vibrations of air external to the transmitter are prevented from actuating said diaphragm.

7. A transmittercomprising a. face plate, a diaphragm mounted in fafe-n-iace relation with said plan. and means invluding a plurality of small and relativeiy deep per'- iuorations through said plate otl'ering :l large amount oi suri'ave lirietion to the passage of presi-:ure rairiaiions therethrough to shield the diaphra'i from Sudden and violent prix sur@ eliai i transmitter yComprisingr a cup, a relatively thirk flat plate forming a @over for said wup, a diaphragm mounted in close faceto-fac'e relation to said plate within said cup. and a plurality of relatively small-pew fomit-ions of uniform depth extending through said plate,

in witness whereof, we herennto suhserihe our naines this 25th day of March, A. D., 1918.

Jona P, Minaccia. @Hannes A. einem.

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