WO1987005433A1 - Variable electric resistance - Google Patents

Variable electric resistance Download PDF

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Publication number
WO1987005433A1
WO1987005433A1 PCT/EP1987/000128 EP8700128W WO8705433A1 WO 1987005433 A1 WO1987005433 A1 WO 1987005433A1 EP 8700128 W EP8700128 W EP 8700128W WO 8705433 A1 WO8705433 A1 WO 8705433A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrical resistance
film
substrate
resistance according
attached
Prior art date
Application number
PCT/EP1987/000128
Other languages
German (de)
French (fr)
Inventor
Wolfgang Girscher
Karl-Heinz NIEDERHÖFER
Original Assignee
Telenorma Telefonbau Und Normalzeit Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telenorma Telefonbau Und Normalzeit Gmbh filed Critical Telenorma Telefonbau Und Normalzeit Gmbh
Publication of WO1987005433A1 publication Critical patent/WO1987005433A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/06—Adjustable resistors adjustable by short-circuiting different amounts of the resistive element
    • H01C10/08—Adjustable resistors adjustable by short-circuiting different amounts of the resistive element with intervening conducting structure between the resistive element and the short-circuiting means, e.g. taps

Definitions

  • the invention relates to a variable electrical resistance with a resistance path applied to a substrate, at the beginning and / or the end of which an electrical connection is attached, and a contact which can be moved over the resistance path and which is used to set the resistance value between the contact point and an electrical resistance Connection serves.
  • Changeable electrical resistors also called potentiometers, are used to set electrical values, for example for manually adjusting the volume of an amplifier, the brightness of a display device, etc.
  • a changeable electrical resistance generally consists of a resistance track which is connected to an electrically non-conductive one Substrate is applied and a grinder movable over the resistance track, whereby by the
  • the movement of the grinder over the resistance track can either be rectilinear, the resistance track itself forming a rectangular surface, or it can also be circular, the resistance track being designed accordingly.
  • Such variable electrical resistances have long been known and are produced in a large number of designs, for example for mounting on printed circuit boards for mounting in front panels, etc. The different embodiments are published, for example, in the publication "Valvo Handbuch: Potentiometer” (1978) Self-published by Valvo in Hamburg. Such potentiometers are expensive to manufacture and, due to the wiper movement on the resistance track, are also subject to wear.
  • the object of the invention is to provide a variable electrical resistance
  • an electrically conductive layer is attached to a film attached parallel to the substrate, namely on the side facing the resistance track, which is pressed onto the same by a nose which can be displaced over the resistance track.
  • variable electrical resistance according to the invention therefore represents a very simple embodiment.
  • spacers are attached between the substrate and the film.
  • Spacers prevent unwanted electrical contact between the electrically conductive layer and the resistance track and can be fixed between the film and the substrate or on both sides of the movable nose.
  • Figure 1 is a section in the 'direction of movement by the substrate and film
  • 2 J i plan view of the substrate
  • Fig. 3 is a plan view of the overlying film.
  • a resistance track 2 is attached to a film 1 (FIG. 1).
  • a foil 6 is held parallel to the foil 1 with a spacer 7, the foil 6 carrying an electrically conductive layer 5 on the side facing the resistance track 2.
  • the nose 4 presses the film 6 and thus the layer 5 onto the resistance track 2, the nose 4 being movable over the resistance track 2, so that the electrically conductive layer 5 is rolled over the resistance track 2.
  • Spacers 3 are attached to both sides of the nose 4, which are moved together with the nose 4 and connected to it.
  • FIG. 2 it can be seen that in the area of the edge of the film 1 a resistance track 2 is arranged parallel to the edge, the electrical connections being formed via the conductor tracks 9 provided on the film 1.
  • the spacer 7 ensures the distance between the film 1 and the film 6.
  • the nose 4 and the spacers 3 together form the part 8 to which the control button, not shown, is attached.
  • the film 6 shown in FIG. 3 carries an electrically conductive layer 5, the connection of which is formed by the conductor track 10.
  • the area of the conductive layer 5 corresponds to the area of the resistance track 2 (FIG. 2), the film 6 being applied over the film 1 in such a way that the areas 2 and 5 are in register.
  • the electrically conductive layer 5 on the film 6 can also be designed as a resistance track.
  • a linear variable electrical resistance is assumed.
  • a logarithmically variable resistor can also be produced, in which the resistance track 2 and possibly also the electrically conductive layer 5 are formed accordingly.
  • the connection of the conductor track 10 is exactly in the middle between the two ends the electrically conductive layer 5 takes place. By corresponding offset of the connection point off-center, other resistance characteristics can also be set, especially when the electrically conductive layer is also designed as a resistance track.
  • the invention is not only applicable to variable electrical resistors with a linear direction of movement, as shown in the present exemplary embodiment, but the invention can also be applied to electrically variable resistors with a circular direction of movement.
  • the invention can be used particularly advantageously in conjunction with membrane keyboards, in which two electrically non-conductive foils lying in parallel are already present anyway. If the substrate 1 is also formed as a film, this film must lie on a flat surface on which the nose 4 presses the film. It is also conceivable to attach two lugs 4 located opposite one another at a corresponding distance, which press the film 1 together from below and the film 6 from above, both lugs 4 being moved over the resistance track 2.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)

Abstract

A potentiometer comprises an elongate resistance (2) arranged on a substrate, a sheet (6) extending in parallel to the resistance and carrying an electrically conducting layer (5) on its side facing the resistance and a part (4) movable on the resistance and which presses the sheet thereagainst in order to produce an electric contact between the conducting layer and the resistance (2). Such a potentiometer is usable particularly in association with a sheet keyboard.

Description

Veränderbarer elektrischer WiderstandChangeable electrical resistance
Die Erfindung betrifft einen veränderbaren elektrischen Widerstand mit einer auf einem Substrat aufgebrachten Widerstandsbahn, an deren Anfang und/oder deren Ende ein elektrischer Anschluß angebracht ist, und einem über die Widerstandsbahn bewegbaren Kontakt, welcher zur Ein¬ stellung des Widerstandswertes zwischen der Kontaktstelle und einem elektrischen Anschluß dient. Veränderbare elektrische Widerstände, auch Potentiometer genannt, dienen zur Einstellung elektrischer Werte, beispielsweise zur manuellen Einstellung der Lautstärke eines Verstärkers, der Helligkeit einer Anzeigevorrichtung, usw. Ein ver¬ änderbarer elektrischer Widerstand besteht in der Regel aus einer Widerstandsbahn, welche auf einem elektrisch nicht leitenden Substrat aufgebracht ist und einem über die Widerstandsbahn bewegbaren Schleifer, wobei durch denThe invention relates to a variable electrical resistance with a resistance path applied to a substrate, at the beginning and / or the end of which an electrical connection is attached, and a contact which can be moved over the resistance path and which is used to set the resistance value between the contact point and an electrical resistance Connection serves. Changeable electrical resistors, also called potentiometers, are used to set electrical values, for example for manually adjusting the volume of an amplifier, the brightness of a display device, etc. A changeable electrical resistance generally consists of a resistance track which is connected to an electrically non-conductive one Substrate is applied and a grinder movable over the resistance track, whereby by the
Abstand zwischen der Kontaktstelle des Schleifers auf der Widerstandsbahn und einem Anschluß der Widerstandswert bestimmt wird. Die Bewegung des Schleifers über die Wider¬ standsbahn kann entweder geradlinig sein, wobei die Widerstandsbahn selbst eine rechteckige Fläche bildet oder auch kreisförmig sein, wobei die Widerstandsbahn entsprechend ausgebildet ist. Derartige veränderbare elektrische Wider¬ stände sind seit langem bekannt und werden in einer Vielzahl von Ausführungen, beispielsweise zur Montage auf Leiterplatten zur Montage in Frontplatten, usw. hergestellt. Die verschieden Ausführungsformen werden beispielsweise in der Druckschrift "Valvo Handbuch: Potentiometer" (1978) erschienen im Selbstverlag der Fa. Valvo in Hamburg beschrieben. Der¬ artige Potentiometer sind in der Herstellung aufwendig und aufgrund der Schleiferbewegung auf der Widerstandsbahn auch Verschleißerscheinungen unterworfen.Distance between the contact point of the grinder on the resistance track and a connection of the resistance value is determined. The movement of the grinder over the resistance track can either be rectilinear, the resistance track itself forming a rectangular surface, or it can also be circular, the resistance track being designed accordingly. Such variable electrical resistances have long been known and are produced in a large number of designs, for example for mounting on printed circuit boards for mounting in front panels, etc. The different embodiments are published, for example, in the publication "Valvo Handbuch: Potentiometer" (1978) Self-published by Valvo in Hamburg. Such potentiometers are expensive to manufacture and, due to the wiper movement on the resistance track, are also subject to wear.
Die Aufgabe der Erfindung besteht nun darin, einenver- änderbaren elektrischen Widerstand anzugeben, dessenThe object of the invention is to provide a variable electrical resistance, the
Herstellung besonders einfach ist.Manufacturing is particularly easy.
Diese Aufgabe wird dadurch gelöst, daß auf einer parall zum Substrat angebrachten Folie und zwar auf der der Wider¬ standsbahn zugewandten Seite eine elektrisch leitende Schicht angebracht ist, welche durch eine über die Wider¬ standsbahn verschiebbare Nase auf dieselbe gepreßt wird.This object is achieved in that an electrically conductive layer is attached to a film attached parallel to the substrate, namely on the side facing the resistance track, which is pressed onto the same by a nose which can be displaced over the resistance track.
Durch die Bewegung der Nase wird die auf der Folie ange¬ brachte elektrisch leitende Schicht über die Widerstands¬ bahn abgerollt, wodurch jegliche Schlei bewegung vermieden wird. Außerdem wird auf einen mechanischen Schleifer ver- ziehtet. Der veränderbare elektrische Widerstand gemäß der Erfindung stellt demnach eine sehr einfache Aus¬ führungsform dar.As a result of the movement of the nose, the electrically conductive layer applied to the film is rolled off over the resistance track, whereby any grinding movement is avoided. A mechanical grinder is also used. The variable electrical resistance according to the invention therefore represents a very simple embodiment.
Eine Weiterbildung der Erfindung besteht darin, daß zwischen Substrat und Folie Abstandshalter angebracht sind. DieA further development of the invention is that spacers are attached between the substrate and the film. The
Abstandshalter verhindern einen ungewollten elektrischen Kontakt zwischen der elektrisch leitenden Schicht und der Widerstandsbahn und können sowohl fest zwischen Folie und Substrat als auch beiderseits der verschiebbaren Nase angebracht sein.Spacers prevent unwanted electrical contact between the electrically conductive layer and the resistance track and can be fixed between the film and the substrate or on both sides of the movable nose.
Weitere Vorteile ergeben sich aus den Unteransprüchen.Further advantages result from the subclaims.
Die Erfindung wird anhand eines Ausführungsbeispiels näher erläutert, welches in der Zeichnung dargestellt ist. Es zeigt: Fig. 1 einen Schnitt in der 'Bewegungsrichtung durch Substrat und Folie, Fig. 2 Ji Draufsicht auf das Substrat und Fig. 3 die Draufsicht auf die darüberliegende Folie.The invention is explained in more detail using an exemplary embodiment which is illustrated in the drawing. It shows: Figure 1 is a section in the 'direction of movement by the substrate and film, 2 J i plan view of the substrate and.. Fig. 3 is a plan view of the overlying film.
Auf einer Folie 1 ist eine Widerstandsbahn 2 angebracht (Fig. 1). Mit einem Abstandshalter 7 wird eine Folie 6 parallel zur Folie 1 gehalten, wobei die Folie 6 auf der der Widerstandsbahn 2 zugewandten Seite eine elektrisch leitende Schicht 5 trägt. Die Nase 4 preßt die Folie 6 und damit die Schicht 5 auf die Widerstandsbahn 2, dabei ist die Nase 4 über die Widerstandsbahn 2 bewegbar, so daß die elektrisch leitende Schicht 5 über die Widerstands¬ bahn 2 abgerollt wird. Zu beiden Seiten der Nase 4 sind Abstandshalter 3 angebracht, welche mit der Nase 4 zusammen bewegt und mit dieser verbunden sind.A resistance track 2 is attached to a film 1 (FIG. 1). A foil 6 is held parallel to the foil 1 with a spacer 7, the foil 6 carrying an electrically conductive layer 5 on the side facing the resistance track 2. The nose 4 presses the film 6 and thus the layer 5 onto the resistance track 2, the nose 4 being movable over the resistance track 2, so that the electrically conductive layer 5 is rolled over the resistance track 2. Spacers 3 are attached to both sides of the nose 4, which are moved together with the nose 4 and connected to it.
In Fig. 2 ist ersichtlich, daß im Bereich der Kante der Folie 1 eine Widerstandsbahn 2 parallel zur Kante ange¬ bracht ist, wobei die elektrischen Anschlüsse über die auf der Folie 1 angebrachten Leiterbahnen 9 gebildet werden. Der Abstandshalter 7 stellt den Abstand zwischen der Folie 1 und der Folie 6 sicher. Die Nase 4 und die Abstandshalter 3 bilden zusammen das Teil 8, an welchem der nicht gezeigte Bedienungsknopf angebracht ist.In FIG. 2 it can be seen that in the area of the edge of the film 1 a resistance track 2 is arranged parallel to the edge, the electrical connections being formed via the conductor tracks 9 provided on the film 1. The spacer 7 ensures the distance between the film 1 and the film 6. The nose 4 and the spacers 3 together form the part 8 to which the control button, not shown, is attached.
Die in Fig. 3 gezeigte Folie 6 trägt eine elektrisch leitende Schicht 5, deren Anschluß durch die Leiterbahn 10 gebildet wird. Die Fläche der leitenden Schicht 5 entspricht der Fläche der Widerstandsbahn 2 (Fig. 2), wobei die Folie 6 über der Folie 1 derart angebracht wird, daß die Flächen 2 und 5 in Deckung liegen.The film 6 shown in FIG. 3 carries an electrically conductive layer 5, the connection of which is formed by the conductor track 10. The area of the conductive layer 5 corresponds to the area of the resistance track 2 (FIG. 2), the film 6 being applied over the film 1 in such a way that the areas 2 and 5 are in register.
Die elektrisch leitende Schicht 5 auf der Folie 6 kann ebenfalls als Widerstandsbahn ausgebildet sein. Bei dem gezeigten Ausführungsbeispiel wird von einem linearen veränderbaren elektrischen Widerstand ausgegangen. Es läßt sich ebenso auch ein logarithmisch veränderbarer Wider¬ stand herstellen, in dem die Widerstandsbahn 2 und evtl. auch die elektrisch leitende Schicht 5 entsprechend ausge¬ bildet wird. Bei dem gezeigten Ausführungsbeispiel wird weiterhir iavon ausgegangen, daß der Anschluß der Leiter¬ bahn 10 genau in der Mitte zwischen den beiden Enden der elektrisch leitenden Schicht 5 erfolgt. Durch ent¬ sprechenden Versatz des Anschlußpunktes außermittig sind auch andere Widerstandscharakteristiken einstellbar, besonders dann, wenn die elektrisch leitende Schicht ebenfalls als Widerstandsbahn ausgebildet ist.The electrically conductive layer 5 on the film 6 can also be designed as a resistance track. In the exemplary embodiment shown, a linear variable electrical resistance is assumed. A logarithmically variable resistor can also be produced, in which the resistance track 2 and possibly also the electrically conductive layer 5 are formed accordingly. In the exemplary embodiment shown, it is further assumed that the connection of the conductor track 10 is exactly in the middle between the two ends the electrically conductive layer 5 takes place. By corresponding offset of the connection point off-center, other resistance characteristics can also be set, especially when the electrically conductive layer is also designed as a resistance track.
Die Erfindung ist nicht nur auf veränderbare elektrische Widerstände mit geradliniger Bewegungsrichtung anwendbar, wie dies im vorliegenden Ausführungsbeispiel gezeigt ist, vielmehr läßt sich die Erfindung auch auf elektrisch veränderbare Widerstände mit kreisförmiger Bewegungsrichtung anwenden.The invention is not only applicable to variable electrical resistors with a linear direction of movement, as shown in the present exemplary embodiment, but the invention can also be applied to electrically variable resistors with a circular direction of movement.
Besonders vorteilhaft kann die Erfindung in Verbindung mit Folientastaturen benutzt werden, bei denen ohnehin bereits zwei parallel liegende, elektrisch nicht leitende Folien vorhanden sind. Ist das Substrat 1 ebenfalls als Folie ausge¬ bildet, so muß diese Folie auf einer flachen Unterlage liegen, auf welche die Nase 4 die Folie preßt. Es ist ebenso denkbar, zwei im entsprechenden Abstand gegenüberliegende Nasen 4 anzubringen, welche die Folie 1 von unten und die Folie 6 von oben zusammenpressen, wobei beide Nasen 4 über die Widerstandsbahn 2 bewegt werden. The invention can be used particularly advantageously in conjunction with membrane keyboards, in which two electrically non-conductive foils lying in parallel are already present anyway. If the substrate 1 is also formed as a film, this film must lie on a flat surface on which the nose 4 presses the film. It is also conceivable to attach two lugs 4 located opposite one another at a corresponding distance, which press the film 1 together from below and the film 6 from above, both lugs 4 being moved over the resistance track 2.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Veränderbarer elektrischer Widerstand mit einer auf einem Substrat angebrachten Widerstandsbahn, an deren Anfang und/oder deren Ende ein elektrischer Anschluß angebracht ist, und einem über die Widerstandsbahn bewegbarer. Kontakt, welcher zur Einstellung des Wider¬ standswertes zwischen der Kontaktstelle und einem elektrischen Anschluß dient, dadurch gekennzeichnet, daß auf einer parallel zum Substrat (1) angebrachten Folie (6) und zwar auf αer der Widerstandsbahn (2) zugewandten Seite eine elektrisch leitende Schicht (5) angebracht ist, welche durch eine über die Widerstandsbahn (2) ver- schiebbare Nase (4) auf dieselbe gepreßt wird.1. Changeable electrical resistance with a resistance track attached to a substrate, at the beginning and / or the end of which an electrical connection is attached, and a movable track over the resistance track. Contact which serves to set the resistance value between the contact point and an electrical connection, characterized in that an electrically conductive layer is applied to a film (6) attached parallel to the substrate (1), namely on the side facing the resistance track (2) (5) is attached, which is pressed onto it by a nose (4) which can be moved over the resistance track (2).
2. Veränderbarer elektrischer Widerstand nach Anspruch 1, dadurci. geke::nz3ir-hr?t, daß zwischen Substrat (1) und Folie (6) Abstandshalter (3,7 angebracht sind.2. Changeable electrical resistance according to claim 1, dadurci. geke :: nz3ir-hr? t that spacers (3, 7) are attached between the substrate (1) and the film (6).
3. Veränderbarer elektrischer Widerstand nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß der Abstandshalter (7) mit dem Substrat (1) und/oder mit der Folie (6) verbunden ist. 3. Variable electrical resistance according to one of claims 1 or 2, characterized in that the spacer (7) with the substrate (1) and / or with the film (6) is connected.
4. Veränderbarer elektrischer Widerstand nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß der Abstandshalter (3) neben der Nase (4) angebracht und mit dieser zusammen bewegbar ist.4. Variable electrical resistance according to one of claims 1 or 2, characterized in that the spacer (3) next to the nose (4) is attached and is movable together with this.
5. Veränderbarer elektrischer Widerstand nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Anschluß (10) der elektrisch leitenden Schicht (5) in der Mitte zwischen den beiden Enden derselben angebracht ist.5. Variable electrical resistance according to one of claims 1 to 4, characterized in that the connection (10) of the electrically conductive layer (5) is attached in the middle between the two ends thereof.
6. Veränderbarer elektrischer Widerstand nach Anspruch 5, dadurch gekennzeichnet, daß der Anschluß der elektrisch leitenden Schicht (5) außerhalb der Mitte zwischen beiden Enden derselben ange¬ bracht ist.6. Changeable electrical resistance according to claim 5, characterized in that the connection of the electrically conductive layer (5) outside the middle between the two ends thereof is attached.
7. Veränderbarer elektrischer Widerstand nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Bewegungsrichtung der Nase (4) geradlinig ist.7. Variable electrical resistance according to one of claims 1 to 6, characterized in that the direction of movement of the nose (4) is rectilinear.
8. Veränderbarer elektrischer Widerstand nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Bewegungsrichtung der Nase (4) kreisförmig ist.8. Changeable electrical resistance according to one of claims 1 to 6, characterized in that the direction of movement of the nose (4) is circular.
9. Veränderbarer elektrischer Widerstand nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das Substrat (1) als Folie ausgebildet ist.9. Changeable electrical resistance according to one of claims 1 to 8, characterized in that the substrate (1) is designed as a film.
10. Veränderbarer elektrischer Widerstand nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß das Substrat (1) und die Folie (6) Teil einer Folien¬ tastatur bilden. 10. Variable electrical resistance according to one of claims 1 to 9, characterized in that the substrate (1) and the film (6) form part of a membrane keyboard.
11. Veränderbarer elektrischer Widerstand nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß das als Folie ausgebildetes Substrat (1) auf einer flachen Unterlage aufliegt und die Nase (4) zusammen mit den Abstandshaltern (3) parallel zur Unterlage beweg¬ bar ist.11. Changeable electrical resistance according to claim 9 or 10, characterized in that the substrate (1) formed as a film rests on a flat surface and the nose (4) together with the spacers (3) is movable parallel to the surface.
12. Veränderbarer elektrischer Widerstand nach einem der Ansprüche 1 bis 11 , dadurch gekennzeichnet, daß die elektrisch leitende Schicht (5) als Widerstands¬ bahn ausgebildet ist.12. Changeable electrical resistance according to one of claims 1 to 11, characterized in that the electrically conductive layer (5) is designed as a resistance track.
13- Veränderbarer elektrischer Widerstand nach einem der Ansprüche 9, 10 oder 12, dadurch gekennzeichnet, daß das Substrat (1) und die Folie (6) durch zwei gegen¬ überliegende, gemeinsam bewegbare Nasen (4) zusam enge- preßt werden. 13- variable electrical resistance according to one of claims 9, 10 or 12, characterized in that the substrate (1) and the film (6) are pressed together by two opposite, mutually movable lugs (4).
PCT/EP1987/000128 1986-03-08 1987-03-05 Variable electric resistance WO1987005433A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863607726 DE3607726A1 (en) 1986-03-08 1986-03-08 CHANGEABLE ELECTRIC RESISTANCE
DEP3607726.7 1986-03-08

Publications (1)

Publication Number Publication Date
WO1987005433A1 true WO1987005433A1 (en) 1987-09-11

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
US7414548B2 (en) * 2003-03-12 2008-08-19 Voelckers Oliver Continuously actuatable keys pertaining to a keyboard comprising an integrated signal detection element, and method for signal processing

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
DE3705778A1 (en) * 1986-03-08 1988-09-01 Telefonbau & Normalzeit Gmbh Terminal for a telecommunications switching system with a membrane potentiometer
DE3624166A1 (en) * 1986-07-17 1988-01-21 Schoeller & Co Elektrotech FILM SWITCHING
FR2702880B1 (en) * 1993-03-17 1995-04-28 Telemecanique Electromagnetic switch device.

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US2575230A (en) * 1948-07-03 1951-11-13 Baldwin Co Electrically noiseless progressive contact means
DE2517769A1 (en) * 1975-04-18 1976-10-28 Stephen Hanson Lampen Manually operated voltage divider with no sliding contacts - depends on finger contact between divider elements
US4333068A (en) * 1980-07-28 1982-06-01 Sangamo Weston, Inc. Position transducer
DE3500462A1 (en) * 1985-01-09 1986-07-10 Wilde Membran Impuls Technik GmbH, 5828 Ennepetal Adjustable resistor analogous to a slide potentiometer

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FR2072675A5 (en) * 1970-11-30 1971-09-24 Lamare Raymond
DE7138190U (en) * 1971-10-08 1972-01-20 Opel A Ag ELECTRICAL RESISTANCE

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Publication number Priority date Publication date Assignee Title
US2575230A (en) * 1948-07-03 1951-11-13 Baldwin Co Electrically noiseless progressive contact means
DE2517769A1 (en) * 1975-04-18 1976-10-28 Stephen Hanson Lampen Manually operated voltage divider with no sliding contacts - depends on finger contact between divider elements
US4333068A (en) * 1980-07-28 1982-06-01 Sangamo Weston, Inc. Position transducer
DE3500462A1 (en) * 1985-01-09 1986-07-10 Wilde Membran Impuls Technik GmbH, 5828 Ennepetal Adjustable resistor analogous to a slide potentiometer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7414548B2 (en) * 2003-03-12 2008-08-19 Voelckers Oliver Continuously actuatable keys pertaining to a keyboard comprising an integrated signal detection element, and method for signal processing

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