DE166521C - - Google Patents
Info
- Publication number
- DE166521C DE166521C DENDAT166521D DE166521DA DE166521C DE 166521 C DE166521 C DE 166521C DE NDAT166521 D DENDAT166521 D DE NDAT166521D DE 166521D A DE166521D A DE 166521DA DE 166521 C DE166521 C DE 166521C
- Authority
- DE
- Germany
- Prior art keywords
- grains
- microphone
- soot
- resistance
- coating
- 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.)
- Active
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 239000004071 soot Substances 0.000 claims description 4
- 239000002775 capsule Substances 0.000 claims description 2
- 239000003245 coal Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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
- H04R21/021—Microphones with granular resistance material
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Description
KAISERLICHESIMPERIAL
PATENTAMT.PATENT OFFICE.
Die vorliegende Erfindung betrifft ein Mikrophon. Dasselbe ist im wesentlichen dadurch gekennzeichnet, daß die Körner oder Teilchen der aus Kohle oder Metall o. dgl. bestehenden Widerstandsmasse und die mit dieser in Berührung befindlichen Oberflächen der Membrane und der Mikrophonrückplatte und die Kapsel mit einer Rußschicht überzogen sind. Als besonders geeignet hat sichThe present invention relates to a microphone. Essentially the same is thereby characterized in that the grains or particles of the coal or metal o. The like. Consisting of resistance mass and those with these in contact surfaces of the diaphragm and the microphone back plate and the capsule is coated with a layer of carbon black. Has proven to be particularly suitable
ίο Petroleumruß erwiesen. Dieser Überzug hat die Wirkung, den elektrischen Widerstand des Apparates im Zustande der Ruhe zu vermehren, ohne die Empfindlichkeit desselben zu verringern. Dies läßt sehr große Wider-Standsänderungen im Kontakt der Graphitoder Metallkörner und der anliegenden Oberflächen erzielen. Hieraus ergibt sich eine sehr große Änderung des das Mikrophon durchfließenden Stromes.ίο Petroleum soot proven. This coating has the effect of increasing the electrical resistance of the apparatus in a state of rest, without reducing its sensitivity. This leaves very large changes in resistance in the contact between the graphite or metal grains and the adjacent surfaces. This results in a very large change in the current flowing through the microphone.
Der Rußüberzug der Körner verhindert außerdem Funkenbildung zwischen den Kohlen oder Metallteilchen, aus denen die Körner bestehen, denn die Unterbrechungsfunken werden viel schneller erlöschen, da sie nicht mehr in der Luft, sondern in Ölkörpern der Rußschicht auftreten. Es wird daher die Verwendung von der gewünschten Wirkung entsprechend starken Strömen ermöglicht, ohne daß eine schnelle Verschlechterung des Apparates zu befürchten wäre.The soot coating on the grains also prevents the formation of sparks between the coals or metal particles that make up the grains, for the interruption sparks will go out much faster as they are no longer in the air but in the oil bodies of the Soot layer occur. It is therefore possible to use strong currents corresponding to the desired effect, without fear of a rapid deterioration of the apparatus.
Das Überziehen mit Ruß nach vorliegender Erfindung kann bei jeder Art von Mikrophonen erfolgen.Coating with carbon black according to the present invention can be applied to any type of microphone take place.
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE166521C true DE166521C (en) |
Family
ID=431910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT166521D Active DE166521C (en) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE166521C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1041536B (en) * | 1952-01-30 | 1958-10-23 | Siemens Ag | Electrically conductive material in powder or semolina form as a microphone filling for telephone microphones |
-
0
- DE DENDAT166521D patent/DE166521C/de active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1041536B (en) * | 1952-01-30 | 1958-10-23 | Siemens Ag | Electrically conductive material in powder or semolina form as a microphone filling for telephone microphones |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE587309C (en) | Method and arrangement for driving devices which utilize the electrostatic attraction force occurring between the contact surfaces when electrical current passes through an assembly consisting of a semiconductor and a semiconductor or conductor that touches the same | |
| DE19680221C2 (en) | Slip contact material, insert composite material, the commutator using the material and the DC motor using the commutator | |
| EP0193218A1 (en) | Sliding contact bearing | |
| DE69910076T2 (en) | LAYERED FILTER STRUCTURE | |
| DE102013215813B4 (en) | gas sensor | |
| DE102005030134A1 (en) | Sensor and operating method for the detection of soot | |
| DE60315063T2 (en) | ELEKTROKONTAKT ELEMENT | |
| DE166521C (en) | ||
| DE2306839C3 (en) | Electrically conductive guide piece | |
| DE3028599A1 (en) | DEVICE FOR GENERATING A CONTROL SIGNAL FOR THE FEEDBACK CONTROL OF THE AIR FUEL RATIO OF A COMBUSTION DEVICE. | |
| DE1590768C3 (en) | Process for the production of a coherent thin, metal-conductive resistance layer on an insulating support body | |
| DE2500387A1 (en) | PRE-COMBUSTION CATALYST FOR COMBUSTION ENGINES | |
| Olmstead | Sun-Spot bands which appear in the spectrum of a calcium arc burning in the presence of hydrogen | |
| DE2444957C2 (en) | Process for the production of a composite material from carbonaceous powder and metal powder | |
| DE63622C (en) | Collector made of coal for electrical machines | |
| DE2357127A1 (en) | DC MOTOR OF SMALL SIZE | |
| DE2914893B2 (en) | Commutator for a small electric motor | |
| WO1986003553A1 (en) | Gas purification device | |
| DE2151603C3 (en) | Process for the production of a primary material for electrical contacts | |
| DE1671482A1 (en) | Catalyst electrode | |
| DE1084977B (en) | Electric ignition device for ignition of the fuel-air mixture in combustion chambers of recoil engines | |
| DE3116680A1 (en) | CONTACT MATERIAL FROM A COPPER ALLOY AND METHOD FOR THE PRODUCTION THEREOF | |
| DE186620C (en) | ||
| DE535972C (en) | Microphone contact body with hard carbon coating | |
| DE102018111481A1 (en) | fuel cell stack |