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EP0093080A1 - Keyboard - Google Patents

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Publication number
EP0093080A1
EP0093080A1 EP83810150A EP83810150A EP0093080A1 EP 0093080 A1 EP0093080 A1 EP 0093080A1 EP 83810150 A EP83810150 A EP 83810150A EP 83810150 A EP83810150 A EP 83810150A EP 0093080 A1 EP0093080 A1 EP 0093080A1
Authority
EP
European Patent Office
Prior art keywords
circuit board
printed circuit
keyboard
key
foam body
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.)
Granted
Application number
EP83810150A
Other languages
German (de)
French (fr)
Other versions
EP0093080B1 (en
Inventor
Werner Urs Frey
Johannes Rometsch
Karl Iseli
Peter Wild
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent NV
Original Assignee
Standard Telephon and Radio AG
International Standard Electric Corp
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 Standard Telephon and Radio AG, International Standard Electric Corp filed Critical Standard Telephon and Radio AG
Priority to AT83810150T priority Critical patent/ATE15843T1/en
Publication of EP0093080A1 publication Critical patent/EP0093080A1/en
Application granted granted Critical
Publication of EP0093080B1 publication Critical patent/EP0093080B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2207/00—Connections
    • H01H2207/022—Plug
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2217/00—Facilitation of operation; Human engineering
    • H01H2217/028—Facilitation of operation; Human engineering on planes with different or alterable inclination, e.g. convex plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2223/00—Casings
    • H01H2223/054—Mounting of key housings on same printed circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/01—Miscellaneous combined with other elements on the same substrate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/024—Miscellaneous with inductive switch

Definitions

  • the present invention relates to a keyboard in which key elements are mounted on a circuit board.
  • blind plates arranged in front of or behind the circuit board have been provided until today.
  • Blind plates in front of the printed circuit board are mostly metal plates, which have a form-fitting recess for each key element, into which the key element is inserted and usually held in place with resilient locking lugs, e.g. in the CH-Pat.Nr. 586 460 described key element with detents 254, during which electrical connections 222 - 224 can be soldered into a circuit board arranged behind it. It is clear that this blind plate is a relatively expensive element due to its many recesses.
  • Fig. 1 shows the floor plan of a keyboard with two key fields and Fig. 2 shows a section through such a keyboard.
  • the keyboard according to Fig. 1 has a cover 11 through which an alpha-numeric keypad 12 and a field 13 with e.g. Function keys through. From the section in Fig. 2 it can be seen that the cover 21 rises from a support surface, not shown, at a small angle, continues after an offset at the same angle over the keypad, is bent twice after the keypad and runs back against the support surface.
  • Key elements 22 are mounted on a circuit board 23 below the cover 21.
  • a further printed circuit board 25 is connected via a plug connector 24, which carries the elements 26 of an evaluation electronics.
  • the plug 24 is advantageously soldered into the circuit board 25 and the circuit board 23 is connected by direct plugging.
  • the printed circuit board carrying the key elements 22 is supported by a molded foam body 27, which body fills the entire remaining cavity below the cover 11 and is fastened to it.
  • the molded foam body advantageously also forms the bottom of the keyboard.
  • the use of this molded foam body results in a considerable reduction in mechanical parts and therefore also a reduction in weight.
  • this reduction in weight leads to lighter designs which are nevertheless able to pass drop tests.
  • FIG. 3 corresponds approximately to the keyboard described in European Patent Application No. EP 0055220, in which the key fields 31-33 are angled towards one another and have different inclinations have compared to a support surface in order to achieve an ergonomically better posture, in which the hands have to be angled and screwed in less than is necessary with a conventional one-piece or flat keyboard.
  • the distribution of the electrical circuits on two circuit boards 23 and 25 connected by the plug 24 has the advantage that, in the case of a transformer keyboard for the relatively large-area circuit board, which contains the primary and secondary windings of the key transformers and carries the key elements, an inexpensive, double-sided cladding Printed circuit board can be used, which no connections between the two facing sides, ie no through plating and no soldering process required. The absence of solder joints on this printed circuit board allows them to be placed directly on the molded foam body, at best with the interposition of an insulating film.
  • the evaluation electronics on the other hand, require through plating, but can be accommodated on the relatively small circuit board 25. Although an additional plug is required to connect the two circuit boards, the three elements together are cheaper than a single larger circuit board with through-plating.
  • This division also makes it possible to make the keyboard as small as possible in terms of the desired key spacing, since in this way the evaluation electronics do not require any space in the depth or width of the keyboard, but are accommodated where the space is required because of the ergonomically necessary Inclination of the keyboard is present anyway.
  • the division also results in a simpler shape of the molded foam body and, in the event of a defect, allows the evaluation electronics to be replaced easily.

Landscapes

  • Push-Button Switches (AREA)
  • Input From Keyboards Or The Like (AREA)

Abstract

Eine Tastatur, bei welcher Tastenelemente (22) auf einer Leiterplatte (23) befestigt sind, benötigt eine gute Abstützung dieser Platte zur Aufnahme der Betätigungskräfte. Diese Abstützung wird durch einen Formschaumkörper (27) erreicht, der den ganzen verbleibenden Hohlraum unterhalb einer Abdeckung (21) ausfüllt. Die Auswerteelektronik (26) ist auf einer von der Tastenplatte getrennten Leiterplatte (25) angeordnet und mit dieser über einen Stecker (24) verbunden. Dies ergibt eine kleine Tastatur, einen Formschaumkörper mit einfacher Auflagefläche und eine leichte Auswechselbarkeit der Auswerteelektronik.A keyboard, in which key elements (22) are attached to a printed circuit board (23), requires good support for this plate in order to absorb the actuating forces. This support is achieved by a molded foam body (27) which fills the entire remaining cavity below a cover (21). The evaluation electronics (26) are arranged on a printed circuit board (25) separate from the key plate and connected to the latter via a plug (24). This results in a small keyboard, a molded foam body with a simple contact surface and an easy interchangeability of the evaluation electronics.

Description

Die vorliegende Erfindung betrifft eine Tastatur, bei welcher Tastenelemente auf einer Leiterplatte montiert sind.The present invention relates to a keyboard in which key elements are mounted on a circuit board.

Bei Tastaturen der obigen Art muss die die Tastenelemente tragende Leiterplatte abgestützt werden muss. Um diese Aufgabe zu übernehmen, wurden bis heute vor oder hinter der Leiterplatte angeordnete Blindplatten vorgesehen. Blindplatten vor der Leiterplatte sind meistens Metallplatten, welche für jedes Tastenelement eine formgerechte Ausnehmung aufweisen, in welche das Tastenelement eingeführt und meistens mit federnden Rastnasen festgehalten wird, z.B. beim im CH-Pat.Nr. 586 460 beschriebenen Tastenelement mit Rastnasen 254 , während dessen elektrische Anschlüsse 222 - 224 in eine dahinter angeordnete Leiterplatte einlötbar sind. Es ist klar, dass diese Blindplatte wegen ihrer vielen Ausnehmungen ein relativ kostspieliges Element darstellt. Blindplatten hinter der Leiterplatte müssen, wenn sie metallisch sind, gegenüber letzterer isoliert sein, oder, wenn sie aus Isoliermaterial sind, eine hinreichende Dicke oder Rippen aufweisen mit dem Nachteil hohen Gewichts oder grosser Bauhöhe. Es ist nun Aufgabe der vorliegenden Erfindung, eine Tastatur vorzusehen, welche eine gute Abstützung der Leiterplatte besitzt, ohne die Nachteile bekannter Abstützungen aufzuweisen.In the case of keyboards of the above type, the printed circuit board carrying the key elements must be supported. To take over this task, blind plates arranged in front of or behind the circuit board have been provided until today. Blind plates in front of the printed circuit board are mostly metal plates, which have a form-fitting recess for each key element, into which the key element is inserted and usually held in place with resilient locking lugs, e.g. in the CH-Pat.Nr. 586 460 described key element with detents 254, during which electrical connections 222 - 224 can be soldered into a circuit board arranged behind it. It is clear that this blind plate is a relatively expensive element due to its many recesses. Blind plates behind the printed circuit board, if they are metallic, must be insulated from the latter, or, if they are made of insulating material, have a sufficient thickness or ribs, with the disadvantage of high weight or great overall height. It is an object of the present invention to provide a keyboard which has good support for the printed circuit board without having the disadvantages of known supports.

Gelöst wird diese Aufgabe durch die im Kennzeichen des ersten Anspruchs genannten Merkmale. Vorteilhafte Weiterbildungen können den abhängigen Ansprüchen entnommen werden.This object is achieved by the features mentioned in the characterizing part of the first claim. Advantageous further developments can be found in the dependent claims.

Ausführungsbeispiele der Erfindung werden nun anhand der Zeichnung näher erläutert. In der Zeichnung zeigt:

  • Die Fig. 1 einen Grundriss einer Tastatur mit zwei Tastenfeldern;
  • Die Fig. 2 einen Schnitt durch die Tastatur nach Fig. 1; und
  • Die Fig. 3 einen Grundriss einer Tastatur mit insgesamt drei gegeneinander abgewinkelten Tastenfeldern.
Embodiments of the invention will now be explained in more detail with reference to the drawing. The drawing shows:
  • Figure 1 is a plan view of a keyboard with two key fields.
  • 2 shows a section through the keyboard of FIG. 1. and
  • Fig. 3 is a plan of a keyboard with a total of three key fields angled against each other.

Fig. 1 zeigt den Grundriss einer Tastatur mit zwei Tastenfeldern und die Fig. 2 einen Schnitt durch eine solche Tastatur. Die Tastatur nach Fig. 1 weist eine Abdeckung 11 auf, durch welche ein alpha-numerisches Tastenfeld 12 und ein Feld 13 mit z.B. Funktionstasten durchtritt. Aus dem Schnitt in Fig. 2 ist ersichtlich, dass die Abdeckung 21 von einer nicht gezeigten Auflagefläche aus unter einem kleinen Winkel ansteigt, nach einer Abkröpfung unter dem gleichen Winkel über das Tastenfeld weiterläuft, nach dem Tastenfeld zweimal abgebogen ist und gegen die Auflagefläche zurückläuft. Auf einer Leiterplatte 23 unterhalb der Abdeckung 21 sind Tastenelemente 22 montiert. Am obern Ende der Leiterplatte 23 ist eine weitere Leiterplatte 25 über einen Steckverbinder 24 angeschlossen, welche die Elemente 26 einer Auswerteelektronik trägt. Vorteilhafterweise ist der Stecker 24 in die Leiterplatte 25 eingelötet und die Leiterplatte 23 wird durch direktes Stecken angeschlossen.Fig. 1 shows the floor plan of a keyboard with two key fields and Fig. 2 shows a section through such a keyboard. The keyboard according to Fig. 1 has a cover 11 through which an alpha-numeric keypad 12 and a field 13 with e.g. Function keys through. From the section in Fig. 2 it can be seen that the cover 21 rises from a support surface, not shown, at a small angle, continues after an offset at the same angle over the keypad, is bent twice after the keypad and runs back against the support surface. Key elements 22 are mounted on a circuit board 23 below the cover 21. At the upper end of the printed circuit board 23, a further printed circuit board 25 is connected via a plug connector 24, which carries the elements 26 of an evaluation electronics. The plug 24 is advantageously soldered into the circuit board 25 and the circuit board 23 is connected by direct plugging.

Die die Tastenelemente 22 tragende Leiterplatte wird durch einen Formschaumkörper 27 gestützt, welcher Körper den ganzen verbleibenden Hohlraum unterhalb der Abdeckung 11 ausfüllt und an dieser befestigt ist. Mit Vorteil bildet der Formschaumkörper gleichzeitig den Boden der Tastatur. Die Verwendung dieses Formschaumkörpers ergibt eine beträchtliche Verminderung an mechanischen Teilen und daher auch eine Gewichtsverminderung. Neben einer leichteren Verschiebbarkeit der Tastatur, die insbesondere bei sog. Management-Tastaturen, d.h. bei Tastaturen, die nur gelegentlich zur Datenabfrage benützt und dann wieder weggeschoben werden, erwünscht ist, führt diese Gewichtsverminderung infolge Verkleinerung der Aufprallenergie zu leichteren Konstruktionen, die dennoch in der Lage sind, Falltests zu bestehen.The printed circuit board carrying the key elements 22 is supported by a molded foam body 27, which body fills the entire remaining cavity below the cover 11 and is fastened to it. The molded foam body advantageously also forms the bottom of the keyboard. The use of this molded foam body results in a considerable reduction in mechanical parts and therefore also a reduction in weight. In addition to easier displacement of the keyboard, which is particularly the case with so-called management keyboards, i.e. in the case of keyboards which are only used occasionally for data retrieval and are then pushed away again, this reduction in weight as a result of the reduction in the impact energy leads to lighter designs which are nevertheless able to pass drop tests.

Eine vorteilhafte Anwendung des Prinzips der Abstützung der Tastatur durch Formschaumkörper ergibt sich bei der in Fig. 3 gezeigten Tastatur, die ungefähr der in der Europäischen Patentanmeldung Nr. EP 0055220 beschriebenen Tastatur entspricht, bei welcher die Tastenfelder 31 - 33 gegeneinander abgewinkelt sind und unterschiedliche Neigungen gegenüber einer Auflagefläche aufweisen, um zu einer ergonomisch bessern Körperhaltung zu kommen, bei welcher die Hände weniger stark abgewinkelt und eingedreht werden müssen, als dies bei einer üblichen einteiligen oder in einer Ebene liegenden Tastatur notwendig ist. In diesem Falle könnte es von Vorteil sein, für die ganze Tastatur einen einzigen Formschaumkörper mit Ausnehmungen vorzusehen, in welche die einzelnen Tastenfelder, versehen mit einer Umrandung, versenkt werden könnten.An advantageous application of the principle of supporting the keyboard by molded foam body results in the keyboard shown in FIG. 3, which corresponds approximately to the keyboard described in European Patent Application No. EP 0055220, in which the key fields 31-33 are angled towards one another and have different inclinations have compared to a support surface in order to achieve an ergonomically better posture, in which the hands have to be angled and screwed in less than is necessary with a conventional one-piece or flat keyboard. In this case, it could be advantageous to provide a single molded foam body with recesses for the entire keyboard, into which the individual key fields, provided with a border, could be sunk.

Die Aufteilung der elektrischen Schaltkreise auf zwei durch den Stecker 24 verbundene Leiterplatten 23 und 25 hat den Vorteil, dass im Falle einer Trafotastatur für die relativ grossflächige Leiterplatte, welche die Primär- und Sekundärwicklungen der Tastentransformatoren enthält und die Tastenelemente trägt, eine kostengünstige, beidseitig kaschierte Leiterplatte verwendet werden kann, welche keine Verbindungen zwischen den beiden Belagsseiten, d.h. keine Durchplattierungen, und auch keinen Lötvorgang benötigt. Die Abwesenheit von Lötstellen auf dieser Leiterplatte erlaubt es, diese, allenfalls unter Zwischenlage einer Isolierfolie, direkt auf dem Formschaumkörper aufliegen zu lassen. Die Auswerteelektronik benötigt dagegen Durchplattierungen, kann aber auf der relativ kleinen Leiterplatte 25 untergebracht werden. Obwohl für die Verbindung der beiden Leiterplatten ein zusätzlicher Stecker notwendig ist, sind die drei Elemente zusammen billiger als eine einzige grössere Leiterplatte mit Durchplattierungen.The distribution of the electrical circuits on two circuit boards 23 and 25 connected by the plug 24 has the advantage that, in the case of a transformer keyboard for the relatively large-area circuit board, which contains the primary and secondary windings of the key transformers and carries the key elements, an inexpensive, double-sided cladding Printed circuit board can be used, which no connections between the two facing sides, ie no through plating and no soldering process required. The absence of solder joints on this printed circuit board allows them to be placed directly on the molded foam body, at best with the interposition of an insulating film. The evaluation electronics, on the other hand, require through plating, but can be accommodated on the relatively small circuit board 25. Although an additional plug is required to connect the two circuit boards, the three elements together are cheaper than a single larger circuit board with through-plating.

Diese Aufteilung erlaubt zudem, die Tastatur so klein zu machen, wie dies vom gewünschten Tastenrastermass her möglich ist, da die Auswerteelektronik auf diese Art keinen Platz in der Tiefe oder Breite der Tastatur benötigt, sondern dort untergebracht ist, wo der Platz wegen der ergonomisch notwendigen Neigung der Tastatur ohnehin vorhanden ist. Die Aufteilung ergibt auch eine einfachere Form des Formschaumkörpers und erlaubt im Falle eines Defektes einen einfachen Austausch der Auswerteelektronik.This division also makes it possible to make the keyboard as small as possible in terms of the desired key spacing, since in this way the evaluation electronics do not require any space in the depth or width of the keyboard, but are accommodated where the space is required because of the ergonomically necessary Inclination of the keyboard is present anyway. The division also results in a simpler shape of the molded foam body and, in the event of a defect, allows the evaluation electronics to be replaced easily.

Claims (5)

1. Tastatur, bei welcher Tastenelemente auf einer Leiterplatte befestigt sind, dadurch gekennzeichnet, dass unterhalb der Leiterplatte eine Formschaumkörper (27) vorgesehen ist, welcher die Leiterplatte ausschliesslich und auf praktisch ihrer ganzen Fläche gegen Durchbiegung infolge von Tastenbetätigungen abstützt.1. Keyboard, in which key elements are attached to a printed circuit board, characterized in that a molded foam body (27) is provided below the printed circuit board, which supports the printed circuit board exclusively and over practically its entire surface against deflection as a result of key actuations. 2. Tastatur nach Anspruch 1, dadurch gekennzeichnet, dass die die Tastenelemente tragende(n) Leiterplatte(n) zusammen mit einer zugehörigen Abdeckung oder Umrandung in Ausnehmungen eines die ganze Tastatur umschliessenden Formschaumkörpers eingelegt ist (sind).2. Keyboard according to claim 1, characterized in that the printed circuit board (s) carrying the key elements, together with an associated cover or border, is (are) inserted into recesses in a molded foam body enclosing the entire keyboard. 3. Tastatur nach Anspruch 1 oder 2 mit kontaktlosen lastenelementen, bei welchen für die Tastenbetätigung das Eintauchen eines ferromagnetischen Kerns in einen auf der Leiterplatte ausgebildeten Tastentransformator notwendig ist, dadurch gekennzeichnet, dass die Tastenelemente (22) auf mindestens einer unter einer Abdeckung (21) angeordneten ersten Leiterplatte (23) befestigt sind, dass eine Auswerteelektronik (26) auf einer zweiten, mit der ersten über einen Stecker (24) verbundenen Leiterplatte (25) angeordnet ist, und dass die die Tastenelemente tragende(n) erste(n) Leiterplatte(n) durch den Formschaumkörper (27) vollflächig gestützt werden.3. Keyboard according to claim 1 or 2 with contactless load elements, in which for the key actuation the immersion of a ferromagnetic core in a key transformer formed on the circuit board is necessary, characterized in that the key elements (22) on at least one under a cover (21) First printed circuit board (23) are attached, that evaluation electronics (26) are arranged on a second printed circuit board (25) connected to the first printed circuit board (24), and that the first printed circuit board carrying the key elements (n) are supported over the entire area by the molded foam body (27). 4. Tastatur nach Anspruch 3, dadurch gekennzeichnet, dass die zweite Leiterplatte (25) senkrecht zur ersten Leiterplatte (23) angeordnet ist, dass der Stecker (24) in die zweite Leiterplatte eingelötet ist, und dass die erste Leiterplatte für Direktsteckung ausgelegte Leiterbahnen aufweist.4. Keyboard according to claim 3, characterized in that the second circuit board (25) is arranged perpendicular to the first circuit board (23), that the plug (24) is soldered into the second circuit board, and that the first circuit board has conductor tracks designed for direct connection . 5. Tastatur nach Anspruch 3, dadurch gekennzeichnet, dass die Tastenelemente auf zwei oder mehr erste Leiterplatten aufgeteilt befestigt sind, welche Leiterplatten derart gegeneinander abgewinkelt und gegen eine Auflagefläche für die Tastatur hin geneigt sind, dass sich eine gegenüber einer einteiligen Tastatur geringere Abwinkelung und Verdrehung der Handgelenke des Bedieners ergibt (Fig. 3).5. Keyboard according to claim 3, characterized in that the key elements are fastened divided into two or more first printed circuit boards, which printed circuit boards are angled towards one another and inclined towards a support surface for the keyboard such that there is less bending and twisting than a one-piece keyboard of the operator's wrists (Fig. 3).
EP83810150A 1982-04-15 1983-04-13 Keyboard Expired EP0093080B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83810150T ATE15843T1 (en) 1982-04-15 1983-04-13 KEYBOARD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH228382 1982-04-15
CH2283/82 1982-04-15

Publications (2)

Publication Number Publication Date
EP0093080A1 true EP0093080A1 (en) 1983-11-02
EP0093080B1 EP0093080B1 (en) 1985-09-25

Family

ID=4230149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83810150A Expired EP0093080B1 (en) 1982-04-15 1983-04-13 Keyboard

Country Status (5)

Country Link
EP (1) EP0093080B1 (en)
JP (1) JPS5916227A (en)
AT (1) ATE15843T1 (en)
CA (1) CA1211531A (en)
DE (1) DE3360872D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2614120A1 (en) * 1987-04-17 1988-10-21 C P Clare Electronique Electronic keyboard
EP1225608A3 (en) * 2001-01-23 2005-04-13 Elcom Corporation Flexibly designable keyboard and a method of producing the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD310680S (en) 1987-09-28 1990-09-18 Proizvodnja in prodaja igrac, pisal, kovinskih in plasticnih izdelkov "Mehano", p.o. Electronic typewriter
DE4004116C2 (en) * 1990-02-10 1997-08-21 Leybold Ag Process for coating a plastic substrate, preferably a polymethyl methacrylate substrate, with metals and device for carrying out the process

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH586460A5 (en) * 1973-08-15 1977-03-31 Illinois Tool Works
EP0055220A2 (en) * 1980-12-19 1982-06-30 Standard Telephon Und Radio Ag Keyboard arrangement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH586460A5 (en) * 1973-08-15 1977-03-31 Illinois Tool Works
EP0055220A2 (en) * 1980-12-19 1982-06-30 Standard Telephon Und Radio Ag Keyboard arrangement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2614120A1 (en) * 1987-04-17 1988-10-21 C P Clare Electronique Electronic keyboard
EP1225608A3 (en) * 2001-01-23 2005-04-13 Elcom Corporation Flexibly designable keyboard and a method of producing the same

Also Published As

Publication number Publication date
DE3360872D1 (en) 1985-10-31
CA1211531A (en) 1986-09-16
EP0093080B1 (en) 1985-09-25
ATE15843T1 (en) 1985-10-15
JPS5916227A (en) 1984-01-27

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