DE431593C

DE431593C - Loudspeaker for direct coupling with a crystal detector, consisting of a microphone relay and a telephone receiver

Info

Publication number: DE431593C
Application number: DEB113814D
Authority: DE
Original assignee: Individual
Current assignee: Individual
Publication date: 1926-07-13

Description

Die Erfindung bezieht sich auf einen Empfangsapparat für drahtlose Telegraphic oder Telephonic und bezweckt die Schaffung eines lautsprechenden Telephons, das direkt mit einem Kristalldetektor verbunden werden kann. Dieser Empfangsapparat besteht in an sich bekannter Weise aus einem Mikrophonrelais und einem Telephonempfänger, die auf einer einzigen Grundplatte angebracht und durch eine Schallisoliervorrichtung voneinander getrennt sind.The invention relates to a wireless telegraphic or receiving apparatus Telephonic and aims to create a loudspeaker telephone that communicates directly with can be connected to a crystal detector. This receiving apparatus consists in itself known way from a microphone relay and a telephone receiver, which on a attached to a single base plate and separated from each other by a soundproofing device are.

Gemäß der Erfindung arbeitet das Mikrophonrelais nach dem Differenzprinzip, und der Empfänger ist mit zwei Sätzen von Wicklungen versehen, um auf die Differenz. der von dem Relais gelieferten Ströme anzusprechen. According to the invention, the microphone relay works on the differential principle, and the receiver is provided with two sets of windings to make up for the difference. the to address currents supplied by the relay.

Die Zeichnung veranschaulicht eine beispielsweise Ausführungsform der Erfindung. Abb. ι ist ein senkrechter Schnitt durch den ganzen Apparat, undThe drawing illustrates an exemplary embodiment of the invention. Fig. Ι is a vertical section through the entire apparatus, and

Abb. 2 ist eine Draufsicht, in der das SchaU-horn sowie der Deckel oder das Gehäuse des Verstärkers fortgelassen sind und das Mikrophon im Schnitt dargestellt ist. Abb. 3 ist ein Schaltungsschema. A ist eine Metallgrundplatte, die sowohl den Verstärker als auch den Lautsprecher trägt. Der letztere wird von einem Gehäuse a umgeben, welches aus einem Stück mit der Grundplatte A besteht und durch Beine, a¹ in einem Abstand von ihr gehalten wird. Das Gehäuse α trägt oben einen mittleren hohlen Stutzen a², der das dünne Ende des Schallhornes B aufnimmt, das die übliche Form hat. Die Grundplatte A ist an den Enden rund und, wie aus Abb. 2 ersichtlich, an dem einen Ende verjüngt, derart, daß das • breitere Ende den Mikrophonverstärker und das schmalere Ende das Telephongehäuse trägt. Das breitere Ende ist mit einem aufrechten Ringflansch ß³ und innerhalb dieses mit einer Öffnung von großem Durchmesser versehen, und an dem ersteren ist die dicke Gummischeibe C mittels der Versteifungsplatten c sowie Schrauben c¹ befestigt, die sie fest gegen den Ringflansch ö³ drücken. Auf der oberen Seite der Gummischeibe C ist die starke Konsole D befestigt,, die den Mikrophonverstärker trägt und deren Flansch d auf der Scheibe C durch Klemmschrauben d¹ sowie durch die unter der Scheibe liegende Klemmplatte c² festgeklemmt ist, so daß die Klemmplatte c² dem mittleren Teil der Gummischeibe die erforderliche Starrheit verleiht. Der Verstärkermagnet E ist auf der aufrechten Vorderfläche der Konsole D durch die Schraubenbolzen F, F¹ einstellbar angeordnet, wobei die Bolzen F in die Konsole geschraubt und an den beiden Schenkeln des Magneten, der Hufeisenform hat, diesen durch die Klemmplatten / und Muttern, f¹ halten, während der Bolzen F¹, der gegen das andere Ende des Magneten hin angebracht ist, eine Feder /² trägt, die zwischen der Konsole D und einer der Klemmplatten /³ liegt, derart, daß das runde Ende des Magneten federnd von der Konsole abgehalten wird. Die Anordnung der Bolzen F ermöglicht eine geringe Winkeleinstellung des Magneten entsprechend der Stellung des Bolzens F¹, der an seinem Außenende mit einer Stellschraube O versehen ist, die eine begrenzte Drehung zuläßt, wodurch die wirksame Länge des Bolzens F¹ etwas vergrößert oder verringert wird, so daß das Polende des Magneten über eine sehr geringe Entfernung mit großer Genauigkeit eingestellt werden kann. Die Anbringung der Bolzen F ist genügend nachgiebig, um die erforderliche sehr feine Einstellung zu ermöglichen. Die Polenden des Magneten tragen die Polstücke /*, die auf einem schrägen Teil an den Enden des Magneten montiert sind, so daß sie in einem Winkel von ungefähr 45° vorragen. Diese Polstücke tragen die Empfängerspulen H und endigen in Polschuhen /^δ, die sehr nahe der steifen Stahlzunge / liegen, die mit einem Ende bei / ,an der Konsole D starr befestigt ist. Das verkleinerte Ende jf¹ der Zunge ist go durch die Stange k mit der mittleren Elektrode k¹ des wie üblich eingerichteten Diffe-Fig. 2 is a plan view in which the horn and the cover or housing of the amplifier are omitted and the microphone is shown in section. Fig. 3 is a circuit diagram. A is a metal base plate that supports both the amplifier and the speaker. The latter is surrounded by a housing a , which consists of one piece with the base plate A and is held at a distance from it by legs, a ^1. The housing α carries a central hollow stub a ² at the top, which receives the thin end of the horn B , which has the usual shape. The base plate A is round at the ends and, as can be seen from Fig. 2, tapered at one end, in such a way that the • wider end carries the microphone amplifier and the narrower end the telephone housing. The wider end is provided with an upright annular flange ß ³ and inside this with an opening of large diameter, and to the former, the thick rubber washer C is attached by means of stiffening plates c and screws ^{c 1} , which press them firmly against the annular flange ö ^3. On the upper side of the rubber disk C , the strong bracket D is attached, which carries the microphone amplifier and whose flange d is clamped on the disk C by clamping screws d ¹ and by the clamping plate c ² located under the disk, so that the clamping plate c ² gives the necessary rigidity to the central part of the rubber washer. The amplifier magnet E is arranged adjustable on the upright front surface of the console D by means of the screw bolts F, F ¹ , the bolts F being screwed into the console and attached to the two legs of the magnet, which has a horseshoe shape, by means of the clamping plates / and nuts, f ¹ hold, while the bolt F ¹ , which is attached to the other end of the magnet, a spring / ² carries, which lies between the console D and one of the clamping plates / ³ , so that the round end of the magnet is resilient from the Console is held. The arrangement of the bolts F allows a small angular adjustment of the magnet according to the position of the bolt F ¹ , which is provided at its outer end with an adjusting screw O , which allows a limited rotation, whereby the effective length of the bolt F ^{1 is} slightly increased or decreased, so that the pole end of the magnet can be adjusted over a very short distance with great accuracy. The attachment of the bolts F is sufficiently flexible to allow the very fine adjustment required. The pole ends of the magnet carry the pole pieces / * which are mounted on an inclined part at the ends of the magnet so that they protrude at an angle of approximately 45 °. These pole pieces carry the receiver coils H and end in pole ^{pieces / δ} , which are very close to the stiff steel tongue /, one end of which is rigidly attached to the console D /. The reduced end jf ^{1 of} the tongue is go through the rod k with the middle electrode k ^{1 of} the customarily set up differential

Claims

Renzmikrofons / ζ rigidly connected, with the electrode k ¹ between two layers of carbon grains in the cell k ^{2 of} the microphone housing, which fill the spaces between the central electrode and the end plates k *, k ¹ , which usually consist of carbon. The plates are isolated from each other and only connected by the grains. The telephone L. Is one of the known Brown loudspeaker type, which has a thin conical membrane / which sits at the end of the steel tongue l ^l and is set in oscillation by the receiver magnet P, the poles of which are close to the tongue l ^l. The loudspeaker is provided with the usual adjustment devices, the details of which, since they are known, are not described. The center of the conical membrane is immediately below the hollow nozzle a ² ,

so that the end of the sound home B picks up, so that the sound vibrations emitted by the membrane exit through the horn. The only essential difference between the loudspeaker L according to the invention and the previously used ones lies in the windings M of the electromagnet β. The circuits are shown in Fig. 3, where the windings M of the receiving magnet are indicated in the form of two pairs of coils that work according to the differential principle. For convenience, the base plate is used as part of the circuit and the coils M are connected to it in the manner indicated, the connection emanating from opposite ends of the two pairs of coils, while the other ends to the two outer plates. k ^? >, kl · of the microphone are connected. The positive pole N of the power source feeding the microphone is also connected to the base plate A , while the negative pole N ^{1 is} connected to the middle plate k ^{1 of} the microphone. The reed / relay is shown in the circuit diagram as attached to the plate k ¹ and the coils H of the electromagnet E are connected to the poles or terminals h to which the connections from the source of the oscillatory current to be amplified are attached. It can be seen that every oscillation of the tongue / caused by the oscillation current flowing through the coils H causes the middle plate k ^{x of} the microphone to oscillate and the current in opposite directions between the middle plate and the two outer plates k ³ and k ^l changed, with the result that the very amplified current 'oscillations in the microphone circuit produce correspondingly increased effects on the tongue l ^{L of} the telephone receiver L. The power source connected to poles N, N ¹ can be a 6 volt battery because very little current is required as the resistance of the microphone and telephone windings is considerable. The amplifier can therefore work with dry elements as the source for the microphone current.

The entire microphone amplifier is surrounded by a removable cover or housing O , which sits on the annular flange cP of the base plate A and is fixed by bayonet or some other simple connection. On top of the linkage, regardless of any connection with the amplifier, the magnetic adjuster P is provided in the form of a button, which can rotate freely around the shaft ρ fixed in the cover of the housing and which carries the small permanent magnet p ¹ , which consists of a simple consists of a straight bar which is strongly magnetized and passes through the button at a short distance from the axis of the button. The magnet p ¹ lies above the amplifier magnet E and can be set in any angular position to the magnet E by turning the knob. It has been shown that the gain that can be achieved can be increased by a suitable setting of the button P , the effect of the magnetic field generated by the small magnet p ¹ greatly influencing the effect of the amplifier magnet on the tongue /. The button is therefore turned by the hearing person during the recording until the volume is at its highest. If it is too large, the magnetic adjuster can be turned back until the desired level of volume is reached.

Ρλτε ν τ claim:

Loudspeaker for direct coupling with a crystal detector, consisting of a Microphone relay and a telephone receiver mounted on a single base plate and supported by a sound isolation device are separated from each other, characterized in that the microphone relay operates on the difference principle and in that the receiver is provided with two sets of windings to compensate for the difference between those supplied by the relay Addressing currents.

1 sheet of drawings.