DE405857C - Incandescent cathode for microphones with ionized gas path - Google Patents
Incandescent cathode for microphones with ionized gas pathInfo
- Publication number
- DE405857C DE405857C DEV17711D DEV0017711D DE405857C DE 405857 C DE405857 C DE 405857C DE V17711 D DEV17711 D DE V17711D DE V0017711 D DEV0017711 D DE V0017711D DE 405857 C DE405857 C DE 405857C
- Authority
- DE
- Germany
- Prior art keywords
- cathode
- microphones
- gas path
- ionized gas
- anode
- 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
Links
Classifications
-
- 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
- H04R23/004—Transducers other than those covered by groups H04R9/00 - H04R21/00 using ionised gas
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Reciprocating Pumps (AREA)
- Jet Pumps And Other Pumps (AREA)
- Joining Of Glass To Other Materials (AREA)
- Cosmetics (AREA)
- Resistance Heating (AREA)
Description
Glühkathode für Mikrophone mit ionisierter Gasstrecke. In dem Patent 350500 ist ein Mikrophon beschrieben, bei welchem durch die Schallwellen ein elektrischer Entladungsvorgang in der freien Luft beeihflußt wird. Die notwendige Ionisierung der Luft wird bei dieser Anordnung am zweckmäßigsten durch hohe Temperatur der Kathode erzielt. Ausführungsformen für derartige Glühlmthoden sind in dem Zusatzpatent 351956 niedergelegt. Als besonders. brauchbar erwiesen sich Platindrähtchen oder -bänder, die, an .ihren beiden Enden eingespannt, vor der Anode erhitzt wurden. Leider blieb bei dieser Anordnung der Abstand zwischen Anode und Kathode, der für eine gute Wirkungsweise wesentlich ist, bei der erforderlichen .starken, Erhitzung nicht konstant. Aus diesem Grunde und um der Glühkathode eine größere Wärmekapazität zu geben, wurde der Heizkörper auf feuerfeste Stäbchen oder Röhrchen aufgewickelt, die ebenfalls beidseitig gelagert vor der Anodendüse montiert waren.Hot cathode for microphones with an ionized gas path. Patent 350500 describes a microphone in which an electrical discharge process in the open air is accompanied by the sound waves. With this arrangement, the necessary ionization of the air is best achieved by the high temperature of the cathode. Embodiments for such incandescent methods are laid down in additional patent 351956. As special. Platinum wires or strips proved to be useful, which, clamped at both ends, were heated in front of the anode. Unfortunately, with this arrangement, the distance between anode and cathode, which is essential for good functioning, did not remain constant with the required high heating. For this reason and in order to give the hot cathode a greater heat capacity, the heating element was wound onto refractory rods or tubes, which were also mounted on both sides in front of the anode nozzle.
Die Abb. i zeigt eine derartige Anordnung. Der ezfoderliche präzise Abstand zwischen Anode und Kathode ist aber auch durch diese Anordnung auf die Dauer nicht zu erzielen. Er muB nach einer gewissen Brennflauer immer wieder von neuem eingestellt werden, da sich der das Heizband h tragende feuerfeste Körper f beispielsweise in der durch die punktierte Linie b angedeuteten Weise verbiegt. Diese stete Nachregulierung bildet ein die Bedienung dieser Aufnahmeanordnung sehr erschwerendes Moment.Fig. I shows such an arrangement. The required precise However, this arrangement also means that the distance between the anode and cathode is permanent not to be achieved. After a certain amount of Brennflauer he has to go over and over again be set, since the fire-resistant body f carrying the heating tape h, for example bends in the manner indicated by the dotted line b. This constant readjustment forms a very difficult moment to operate this recording arrangement.
Die Erfindung vermeidet den geschilderten Nachteil der bisherigen Glühkathoden in der Weise, daß sie die -erhitzten Kathodenteile (Draht und feuerfeste Masse) in ihrer ganzen Länge mit kälteren Teilen des feuerfesten Tragkörpers zusammenhängen läBt, wodurch ein Verbiegen der der Anode zugekehrten Kante oder Oberfläche unmöglich wird.The invention avoids the described disadvantage of the previous one Hot cathodes in such a way that they remove the heated cathode parts (wire and refractory Mass) are related in their entire length to colder parts of the refractory support body This makes it impossible for the edge or surface facing the anode to bend will.
Die Abb. z zeigt eine .derartige für eine flache Anodendüse bestimmte Glühkathode. d ist die Anodendüse, f ein flacher, feuerfester Tragkörper, auf dessen vorderem verjüngten Ende die Heizspirale h aufgewickelt und vermittels Kalzium o. dgl. fest mit dem Tragkörper verbunden worden ist. l ist eine Einspannvorrichtung für die Glühkathode, womit sie an der Mikrophonanordnung befestigt wird. Gibt man der Anodendüse, was ohne weiteres möglich ist, ringförmigen Querschnitt, so kann vorteilhaft :der feuerfeste Tragkörper bzw. die Glühkathode ebenfalls zylindrischen Querschnitt bekommen. Diese Anordnung hat aus Gründen leichterer Herstellbarkeit verschiedene Vorteile.Fig. Z shows such a type intended for a flat anode nozzle Hot cathode. d is the anode nozzle, f a flat, refractory support body on its At the front tapered end the heating coil h is wound up and by means of calcium or the like. Like. Has been firmly connected to the support body. l is a jig for the hot cathode, with which it is attached to the microphone assembly. Gives one of the anode nozzle, which is easily possible, annular cross-section, so can be advantageous: the refractory support body or the hot cathode is also cylindrical Get cross-section. This arrangement has to be easier to manufacture various advantages.
Die beschriebenen Anordnungen besitzen aber noch einen Nachteil. Die der Anode gegenüberliegenden glühenden Teile haben infolge des auftretenden Wärmegefälles eine niedrigere Temperatur als die Heizdrähte und ihre benachbarten Stellen. Man muß infolge-. dessen, um den nötigen Emissionsstrom zu bekommen, diese Teile beträchtlich überhitzen, was selbstverständlich ihre Haltbarkeit vermindert. Diesem Nachteil hilft, wobei auch die bewährte spitze Form der Kathode erhalten bleibt, eine Anordnung ab, wie sie Abb. 3 darstellt. Der um den feuerfesten Körperfliegende Heizdraht h ist über eine kurze Strecke an dem der Anode d zugekehrten Ende des Tragkörpers f vo@rübergeführt und an dieser Stelle durch aufgebrachtes Kalzium fest mit dem Tragkörper verkittet. Verjüngt man außerdem den Querschnitt des Heizdrahtes an dieser Stelle etwas, z. B. durch Befeilen, so hat man es in .der Hand, an der aktiven Stelle eine wesentlich höhere Temperatur als an den übrigen Teilen der Glühkathode zu erzielen, wodurch die Haltbarkeit wesentlich gefördert wird. Die um den Tragkörper f liegenden Spiralen dienen bei dieser Anordnung gewissermaßen nur zur Vorwännung des feuerfesten Blockes f.However, the arrangements described also have a disadvantage. the The glowing parts opposite the anode have due to the heat gradient that occurs a lower temperature than the heating wires and their neighboring places. Man must as a result. of which, in order to get the necessary emission current, these parts considerably overheat, which of course reduces their shelf life. This disadvantage helps, whereby the tried and tested pointed shape of the cathode is retained, an arrangement as shown in Fig. 3. The heating wire flying around the refractory body h is over a short distance at the end of the support body facing the anode d f vo @ transferred and at this point firmly with the applied calcium Support body cemented. The cross-section of the heating wire is also tapered at this point Put something, e.g. B. by filing, so you have it in your hand, in the active place to achieve a significantly higher temperature than on the other parts of the hot cathode, whereby the durability is significantly promoted. The lying around the support body f In this arrangement, spirals serve to a certain extent only to pre-heat the refractory Block f.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV17711D DE405857C (en) | 1919-08-03 | 1922-08-26 | Incandescent cathode for microphones with ionized gas path |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE350500T | 1919-08-03 | ||
US458632A US1534148A (en) | 1919-08-03 | 1921-04-04 | Sound-translating apparatus |
DEV17711D DE405857C (en) | 1919-08-03 | 1922-08-26 | Incandescent cathode for microphones with ionized gas path |
Publications (1)
Publication Number | Publication Date |
---|---|
DE405857C true DE405857C (en) | 1924-11-12 |
Family
ID=40404873
Family Applications (7)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1916351955D Expired DE351955C (en) | 1916-11-05 | 1916-11-05 | Glow cathode for microphones |
DE1919350500D Expired DE350500C (en) | 1919-08-03 | 1919-08-03 | Method for controlling electrical currents by means of acoustic forces |
DE1920351956D Expired DE351956C (en) | 1919-08-03 | 1920-06-23 | Gas discharge path for controlling electrical currents under the influence of sound forces |
DEV15651D Expired DE368025C (en) | 1919-08-03 | 1920-06-23 | Method for controlling electrical currents by means of acoustic forces |
DEV16512D Expired DE368288C (en) | 1919-08-03 | 1921-05-19 | Device for the execution of the method for controlling electrical currents by sound forces |
DEV16511D Expired DE366266C (en) | 1919-08-03 | 1921-05-19 | Device for suppressing air currents in the method for controlling electrical currents by sound forces |
DEV17711D Expired DE405857C (en) | 1919-08-03 | 1922-08-26 | Incandescent cathode for microphones with ionized gas path |
Family Applications Before (6)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1916351955D Expired DE351955C (en) | 1916-11-05 | 1916-11-05 | Glow cathode for microphones |
DE1919350500D Expired DE350500C (en) | 1919-08-03 | 1919-08-03 | Method for controlling electrical currents by means of acoustic forces |
DE1920351956D Expired DE351956C (en) | 1919-08-03 | 1920-06-23 | Gas discharge path for controlling electrical currents under the influence of sound forces |
DEV15651D Expired DE368025C (en) | 1919-08-03 | 1920-06-23 | Method for controlling electrical currents by means of acoustic forces |
DEV16512D Expired DE368288C (en) | 1919-08-03 | 1921-05-19 | Device for the execution of the method for controlling electrical currents by sound forces |
DEV16511D Expired DE366266C (en) | 1919-08-03 | 1921-05-19 | Device for suppressing air currents in the method for controlling electrical currents by sound forces |
Country Status (5)
Country | Link |
---|---|
US (1) | US1534148A (en) |
DE (7) | DE351955C (en) |
FR (1) | FR532175A (en) |
GB (1) | GB157442A (en) |
NL (1) | NL11725C (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR910133A (en) * | 1945-01-10 | 1946-05-28 | Comptoir Des Cendres Et Metaux | thermionic emitter |
US2669609A (en) * | 1948-10-30 | 1954-02-16 | Rca Corp | Electron discharge device |
US2530745A (en) * | 1948-12-10 | 1950-11-21 | Bell Telephone Labor Inc | Transistor microphone with conductive grains |
US2768246A (en) * | 1951-05-12 | 1956-10-23 | Charles Legorju | Electrical transducer |
US3580075A (en) * | 1967-07-31 | 1971-05-25 | Corning Glass Works | Pressure transducer for ionizable fluids |
US5401038A (en) * | 1993-08-26 | 1995-03-28 | David G. Peck | Mechanical brake for in-line roller skates |
US5375859A (en) * | 1993-08-26 | 1994-12-27 | David G. Peck | Mechanical brake for in-line roller skate |
-
1916
- 1916-11-05 DE DE1916351955D patent/DE351955C/en not_active Expired
-
1919
- 1919-08-03 DE DE1919350500D patent/DE350500C/en not_active Expired
-
1920
- 1920-06-23 DE DE1920351956D patent/DE351956C/en not_active Expired
- 1920-06-23 DE DEV15651D patent/DE368025C/en not_active Expired
-
1921
- 1921-01-10 GB GB1371/21A patent/GB157442A/en not_active Expired
- 1921-03-15 FR FR532175D patent/FR532175A/en not_active Expired
- 1921-03-26 NL NL18704A patent/NL11725C/xx active
- 1921-04-04 US US458632A patent/US1534148A/en not_active Expired - Lifetime
- 1921-05-19 DE DEV16512D patent/DE368288C/en not_active Expired
- 1921-05-19 DE DEV16511D patent/DE366266C/en not_active Expired
-
1922
- 1922-08-26 DE DEV17711D patent/DE405857C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US1534148A (en) | 1925-04-21 |
DE350500C (en) | 1922-03-22 |
DE368025C (en) | 1923-01-29 |
NL11725C (en) | 1924-10-15 |
DE351956C (en) | 1922-04-19 |
DE351955C (en) | 1922-04-19 |
DE368288C (en) | 1923-02-06 |
FR532175A (en) | 1922-01-30 |
GB157442A (en) | 1921-09-22 |
DE366266C (en) | 1923-01-03 |
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