US235707A - Telephone-transmitter - Google Patents
Telephone-transmitter Download PDFInfo
- Publication number
- US235707A US235707A US235707DA US235707A US 235707 A US235707 A US 235707A US 235707D A US235707D A US 235707DA US 235707 A US235707 A US 235707A
- Authority
- US
- United States
- Prior art keywords
- carbon
- transmitter
- diaphragm
- telephone
- strip
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 16
- 229910052799 carbon Inorganic materials 0.000 description 16
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000009740 moulding (composite fabrication) Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000000284 resting effect Effects 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
- H04R1/288—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding for loudspeaker transducers
Definitions
- My invention relates to that class 'of transmitters employing a local battery and an induction-coil.
- Figure 1 is a plan of the transmitter with the top removed.
- Fig.2 is a sectional view of the above, and also shows the top of the case and the mouth-piece.
- C is a block of carbon, glued or otherwise attached to the bottom of the box or case of the transmitter.
- D is the diaphragm, consisting of a strip of copper, brass, or olher metal, attached to a block, B, of somenon-conducting substanceas woodby means of the screw S.
- I is a spring fastened at A, and having one end resting upon tlfe metallic strip D, the object of which is to deaden any tones which otiiferwise might be given out by the metal itse
- One of the wires is attached directly to the carbon, as showuat W, the other connection being made at V with the metallic strip form ing the diaphragm.
- Carbon transmitters as heretofore made, have been more or less complicated in construction, generally consisting of a thin disk or plate of carbon combined with some metal, as platinum-foil, and such plate of carbon, being very liable to break, also required protection.
- My invention or transmitter is simpler in construction and less liable to be injured by use. It consists simply of a block of carbon, C, fastened directly to the bottom of the box or case of the transmitter. The carbon may be glued to the case, but any suitable means of attachment may be used.
- the diaphragm D Resting at one end directly upon the carbon itself is the diaphragm D, consisting of a strip of copper, the other end of which is fastened to a non-conducting support (shown at B) by means of a screw, S.
- This diaphragm may be attached to the sides of the case, or in any way most convenient, it only being essential that it is fastened in such a way that its normal pressure upon the carbon may be adjusted by tightening or loosening the screw fastening it at its other end.
- I employ a spring, which rests upon the diaphragm, as shown at I, and destroys any vibrations produced in the metal itself.
- ⁇ Vhen words are spoken or sounds made in the vicinity of the mouth-piece of the transmitter the metallic strip or diaphragm D is thrown into vibrations, which vary the resistance of the carbon, and thus control the current transmitting the sound.
Description
(No Model.) G. W. SMITH.
Telephone Transmitter.
No. 235,707. Patented Dec. 21,1880
N. PETERS, PHOTO-LITHDGRAPHER, WASHINGT ON o. c.
IJNITED STATES PATENT OFFICE.
GEORGE W. SMITH, OF NEW HARTFORD, CONNECTICUT.
TELEPHON E-TRANSM ITTER.
SPECIFICATION forming part of Letters Patent No. 235,707, dated December 21, 1880.
Application filed July 20, 1880. (No model.)
To all whom t't may concern:
Be it known that I, GEORGE W. SMITH, residing in the town of New Hartford, county of Litchtield, and State of Connecticut, have invented a new and useful Improvement in Telephone-Transmitters; and I do hereby declare that the following is a full, clear, and ex act description thereof, reference being bad to the accompanying drawings, making a part of this specification. Y
My invention relates to that class 'of transmitters employing a local battery and an induction-coil.
In the accompanying drawings, Figure 1 is a plan of the transmitter with the top removed. Fig.2 is a sectional view of the above, and also shows the top of the case and the mouth-piece.
C is a block of carbon, glued or otherwise attached to the bottom of the box or case of the transmitter.
D is the diaphragm, consisting of a strip of copper, brass, or olher metal, attached to a block, B, of somenon-conducting substanceas woodby means of the screw S.
I is a spring fastened at A, and having one end resting upon tlfe metallic strip D, the object of which is to deaden any tones which otiiferwise might be given out by the metal itse One of the wires is attached directly to the carbon, as showuat W, the other connection being made at V with the metallic strip form ing the diaphragm.
Carbon transmitters, as heretofore made, have been more or less complicated in construction, generally consisting of a thin disk or plate of carbon combined with some metal, as platinum-foil, and such plate of carbon, being very liable to break, also required protection.
My invention or transmitter is simpler in construction and less liable to be injured by use. It consists simply of a block of carbon, C, fastened directly to the bottom of the box or case of the transmitter. The carbon may be glued to the case, but any suitable means of attachment may be used.
Resting at one end directly upon the carbon itself is the diaphragm D, consisting of a strip of copper, the other end of which is fastened to a non-conducting support (shown at B) by means of a screw, S. This diaphragm may be attached to the sides of the case, or in any way most convenient, it only being essential that it is fastened in such a way that its normal pressure upon the carbon may be adjusted by tightening or loosening the screw fastening it at its other end.
In place of copper I have employed as a diaphragm strips of brass or other metal.
It will be ObSGlWd that in my transmitter the diaphragm itself is in direct contact with the carbon, there being no intervening substance between the two, and that the wires are attached respectively to the carbon and to the metallic strip forming the diaphragm. By this means I produce a transmitter both simpler and cheaper in construction and also more reliable in action.
In order to destroy any sound given out by.
the strip or diaphragm and make the sounds transmitted clearer, I employ a spring, which rests upon the diaphragm, as shown at I, and destroys any vibrations produced in the metal itself.
I prefer to use a block of pure carbon but prepared carbon made in any suitable form may be employed.
\Vhen words are spoken or sounds made in the vicinity of the mouth-piece of the transmitter the metallic strip or diaphragm D is thrown into vibrations, which vary the resistance of the carbon, and thus control the current transmitting the sound.
What I claim, and desire to secure by Letters Patent, is
1. In atelephonic transmitter, acarbon block or disk, orits equivalent, and a metallic strip, forming the diaphragm, resting directly upon the carbon, the pressure of which is regulated by a screw at its farther end, substantially as and for the purpose set forth.
2. In a telephonic transmitter, the combination of the carbon block, the copper strip D,
and the spring 1 substantially as described.
GEO. W. SMITH. Witnesses: CHAs. B. WHEELER, J. L. WOODRUFF.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US235707A true US235707A (en) | 1880-12-21 |
Family
ID=2305070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US235707D Expired - Lifetime US235707A (en) | Telephone-transmitter |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US235707A (en) |
-
0
- US US235707D patent/US235707A/en not_active Expired - Lifetime
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