DE2551226B1

DE2551226B1 - Display device for potential fields

Info

Publication number: DE2551226B1
Application number: DE19752551226
Authority: DE
Inventors: Eduard Dr David; Erich Dipl-Ing Szehi
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 1975-11-14
Filing date: 1975-11-14
Publication date: 1977-02-03

Description

In der Fig. 1 ist mit 1 eine Widerstandsschicht aus Graphit in Bindemittel bezeichnet, die mit insgesamt vier Anschlußkontakten 2 bis 5 für elektrische Ströme versehen ist. Die Anschlußkontakte bestehen aus aufgebrachtem Silber. Auf die Widerstandsschicht 1 folgt eine Kunststoffschicht 6 mit eingebettetem Leuchtstoff (ZnS). Es folgt eine Rückelektrode 7, z. B. In Fig. 1, 1 is a resistance layer made of graphite in binder denotes, with a total of four connection contacts 2 to 5 for electrical currents is provided. The connection contacts consist of applied silver. On the resistive layer 1 follows a plastic layer 6 with embedded Fluorescent substance (ZnS). This is followed by a back electrode 7, e.g. B.

aus transparentem SnO2, und auf diese eine Glasplattenabdeckung 8. Auf der Oberfläche der Widerstandsschicht 1 befindet sich ebenfalls eine Glasplattenabdekkung 9.made of transparent SnO2, and on top of this a glass plate cover 8. A glass plate cover is also located on the surface of the resistance layer 1 9.

Wird nun z. B. ein Wechselfeld an zwei oder mehr Elektroden des Flächenwiderstandes 1 angeschlossen, so ergeben sich in Abhängigkeit von der Feldstärkenverteilung Potentialdifferenzen, die zu entsprechenden Spannungsabfällen an den einzelnen Elementarwiderständen Ru . . . Rn der Ersatzschaltbilder nach F i g. 2 und 3 führen. Die Folge ist eine entsprechende Leuchtdichte an den den Widerständen zugeordneten Elementarleuchtkondensatoren Cm ... Cm, die durch die Rückelektrode 7 entsprechend der Potentialdifferenz aufgeladen sind. If now z. B. an alternating field at two or more electrodes of the sheet resistance 1 connected, there are potential differences depending on the field strength distribution, the corresponding voltage drops across the individual elementary resistors Ru . . . Rn the equivalent circuit diagrams according to FIG. 2 and 3 lead. The consequence is a corresponding one Luminance at the elementary luminous capacitors Cm assigned to the resistors ... Cm, charged by the back electrode 7 according to the potential difference are.

Vorzugsweise soll nun mit einer Anzeigevorrichtung gemäß Fig. 1 das Interferenzfeld zweier Stromkreise, wie sie in elektromedizinischen Geräten zur Anwendung der Mittelfrequenztherapie erzeugt werden, sichtbar gemacht werden. Dabei handelt es sich um Wechselstromkreise mit einer Frequenz im Bereich von 4000Hz, die beispielsweise in Phase und Amplitude zueinander verändert werden können. Die F i g. 4 zeigt einen Mittelfrequenzoszillator 10, der einerseits über einen Amplitudenregler 11 direkt mit den Elektrodenanschlüssen 4, 5 der Anzeigevorrichtung 1 bis 9 und andererseits über einen Phasenschieber 12 mit weiterem Amplitudenregler 13 mit den Elektroden 2, 3 verbunden ist. Es ergibt sich somit ein Interferenzbild 14, aus dem sich unmittelbar die Orte maximaler Interferenzbildung in Form z. B. der Helligkeitsschwankungen ablesen lassen. Durch gegensinnige Amplitudenregelung an den Reglern 11, 13 können dabei die Orte maximaler Interferenz verschoben werden. Preferably, with a display device according to FIG. 1, the Interference field of two circuits, as used in electrical medical devices Application of medium frequency therapy can be generated, made visible. Included it is an alternating current circuit with a frequency in the range of 4000Hz that for example, can be changed in phase and amplitude to each other. The F i g. 4 shows a medium-frequency oscillator 10, which on the one hand has an amplitude regulator 11 directly to the electrode connections 4, 5 of the display device 1 to 9 and on the other hand via a phase shifter 12 with a further amplitude controller 13 with the Electrodes 2, 3 is connected. An interference image 14 is thus obtained which immediately the places of maximum interference in the form of z. B. the brightness fluctuations read off. By adjusting the amplitude in opposite directions on the controllers 11, 13 thereby the places of maximum interference are shifted.

Anstelle der homogenen Schicht des Flächenwiderstandes können auch inhomogene Schichten, wie z. B. Instead of the homogeneous layer of the sheet resistance can also inhomogeneous layers, such as B.

auch Körpergewebe, zur Anwendung gelangen; damit lassen sich Feldverteilungen in solchen Schichten unmittelbar im Leuchtbild darstellen. Als optisch aktive Schicht läßt sich gegebenenfalls auch eine Flüssigkristallschicht verwenden. Alle diese Ausführungsformen sollen mit unter die Erfindung fallen.also body tissue, are used; this allows field distributions in such layers directly in the luminous image. As an optically active layer a liquid crystal layer can also be used if necessary. All these Embodiments are intended to fall under the invention.

Claims

Claims: 1. Display device for potential fields, in particular the interference field of interference currents in medical interference current therapy, characterized by a sheet resistance (1) connected to connections (2 to 5) is provided for a predeterminable number of electrical circuits and in the or are applied to the substances (6), which depend on the potential field or field strength distributions in the sheet resistance (1) in terms of the visual display can be activated.

2. Apparatus according to claim 1, characterized in that the sheet resistance 1. A film of distilled water is used.

3. Apparatus according to claim 1, characterized in that the sheet resistance (1) A resistive layer made of SnO # or graphite is used.

4. Device according to one of claims 1 to 3, characterized in that that serve as connections (2 to 5) for the circuits metal electrodes that are in In the case of a water film, the surface resistance is applied to the water film or in the case of using a SnO2 or graphite layer as sheet resistance are formed by applied silver.

5. Device according to one of claims 1 to 4, characterized in that that on the sheet resistor (1) a luminescent layer (6) made of plastic with embedded ZnS is applied as a phosphor.

6. Device according to one of claims 1 to 5, characterized in that that the sheet resistance (1) together with the electroluminescent layer (6) as well a rear electrode (7) hermetically to the outside on both sides through a glass plate (8, 9) is completed

7. Device according to one of claims 1 to 6, characterized in that that the electrodes (2, 3 or 4, 5) of the sheet resistance (1) connections for the form two currents of an interference current therapy device (10 to 13).

The invention relates to a display device for potential fields, in particular the interference field of interference currents in medical Interference current therapy.

Two-dimensional representations of electric field strengths or Potential field distributions depending on the electrode shape and inhomogeneities in the field area could so far only by point-like measuring, z. B. in electrolytic trough. However, this method requires one considerable expenditure on equipment and can therefore at best serve as a basis for laboratory tests be.

However, particularly in medical interference current therapy the place of application relocated directly to the patient. But right here is that Representation of the interference current field in the visual image is of particular importance. at the interference current therapy are namely the places of maximum interference formation at the same time also places of maximum irritation. Furthermore, the location of the maximum Formation of interference easy type only by changing the amplitude in the individual AC circuits can be moved at will. From a visual image of the interference field are now the places of maximum interference formation or their displacement with a Shift immediately visible. Such a visual inspection allows optimal Adaptation of the interference current field to the body part to be irritated and thus also optimal stimulation therapy.

The object of the invention is to provide a display device for potential fields specify which gets by with a minimum of equipment expenditure, that is to say with the least technical effort is also small in volume and therefore easy to transport, and which is still optimal in terms of image reproduction.

A display device showing all the conditions of the task resolves satisfactorily and is therefore also suitable for use in interference current therapy particularly suitable, is characterized by a sheet resistance with connections is provided for a predeterminable number of electrical circuits and in the or are applied to the substances that depend on the potential field or Field strength distributions in the sheet resistance can be activated in the sense of the optical display are. In a preferred embodiment of the invention, the sheet resistance should be a have the highest possible resistance value. In the simplest case, this can be done by a Film can be realized from distilled water. However, the resistive layer is preferred made of SnO # or graphite (layer thickness approx. 10 iL). The connection of the circuits In the simplest case, a more conductive layer is applied to the sheet resistance Metal electrodes of selected shape and size on the water film or in the case of the Use of a SnO2 or graphite layer, preferably by applying silver on this layer. The resistance layer selected in this way and provided with contacts is then associated with another layer of a material, due to the potential field resp.

Field strength distribution undergoes energetic changes, which in turn lead directly to optical effects. This layer is preferably a (an known) luminescent layer made of ZnS embedded in plastic. Used as Resistance layer used distilled water, so must between phosphor and Water, of course, also has a suitable dielectric and insulating layer be provided for protection against moisture. The entire arrangement is also for outer protection hermetically enclosed between two glass plates.

Further advantages and details of the invention emerge from the following description of an embodiment based on the drawing in Connection with the subclaims. 1 shows the basic structure of a display device according to the invention, FIG. 2 and 3 electrical equivalent circuit diagrams of the recording device according to FIG. 1, Fig. 4 shows a recording device according to FIG. 1 in interconnection with stimulation current generators for medical interference current therapy.