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EP0148437A1 - Key cap for a keyboard mounted in a housing - Google Patents

Key cap for a keyboard mounted in a housing Download PDF

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Publication number
EP0148437A1
EP0148437A1 EP84115189A EP84115189A EP0148437A1 EP 0148437 A1 EP0148437 A1 EP 0148437A1 EP 84115189 A EP84115189 A EP 84115189A EP 84115189 A EP84115189 A EP 84115189A EP 0148437 A1 EP0148437 A1 EP 0148437A1
Authority
EP
European Patent Office
Prior art keywords
housing
key cap
key
synthetic resin
cap according
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
EP84115189A
Other languages
German (de)
French (fr)
Other versions
EP0148437B1 (en
Inventor
Reinhold Kiesewetter
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens 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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to AT84115189T priority Critical patent/ATE32802T1/en
Publication of EP0148437A1 publication Critical patent/EP0148437A1/en
Application granted granted Critical
Publication of EP0148437B1 publication Critical patent/EP0148437B1/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
    • H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member
    • H01H13/52—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member the contact returning to its original state immediately upon removal of operating force, e.g. bell-push switch
    • 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
    • H01H13/02—Details
    • H01H13/023—Light-emitting indicators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/036—Light emitting elements
    • H01H2219/052—Phosphorescence
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/036—Return force
    • H01H2221/044—Elastic part on actuator or casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/044—Injection moulding
    • H01H2229/046—Multi-colour or double shot injection moulding

Definitions

  • the invention relates to a key cap for a keyboard arranged in a device of the electrical communication technology, in particular the operating device of a telephone device, which is inserted into a housing opening of the device and can be pressed via a pin against a keyboard arranged inside the housing to actuate it.
  • dialing devices which have so far mostly been provided with a rotating dial.
  • dialing devices there are also devices of this type, and in particular car telephone devices, which have operating devices with dialing keyboards, by means of which the dialing process is made considerably easier.
  • the keyboards are provided with numbers or symbols according to their function, most of which are printed.
  • the operating device of a telephone device can either be a separate device with an associated handset, as is generally the case, or a handset in which the dialing and display units are integrated. In both cases keyboards are required, which are actuated by means of key caps inserted into the housing openings.
  • the invention has for its object to provide a stable and reliable guide for such key caps in the housing and to ensure good recognition or readability in different lighting conditions for numbers and symbols.
  • the key cap which can be inserted into the housing opening with lateral play and has a correspondingly configured pin on at least one side running parallel to the housing opening has a prestressed spring element which is inclined at an acute angle to the housing and which is on is supported on a stop surface in the housing and rests on the inside wall of the housing with the upper side of the laterally projecting contact surfaces formed by the spring elements and enlarged in diameter compared to the housing opening.
  • the key cap 1 consists of a downwardly open, half-shell-shaped plastic part of rectangular shape, on the longitudinal and transverse sides of which spring elements 2 are attached, preferably molded on. These spring elements 2 are fastened to the corners of the key cap 1 and run at an acute angle against the horizontal plane downwards, that is to say towards the housing 6 in which they are inserted.
  • the key cap 1 is stepped at the top, the middle, raised part 3 being provided with a recess corresponding to the number or symbol with which the key cap 1 is to be identified.
  • the number or the symbol exist made of a translucent plastic.
  • a light-collecting, fluorescent-colored plastic is used, which combines the advantageous properties that it is easily legible both during the day and sufficiently illuminated from inside and thus legible at night.
  • Fig. 5 shows the key cap 1 described above in the installed state.
  • Several keycaps are expediently arranged in a grid and provided with the symbols corresponding to their function.
  • the associated buttons 8 are mounted in the same grid, for example on a printed circuit board 10 and soldered in the example shown via solder connections 9.
  • the key cap 1 is inserted into the opening of a housing 6.
  • a lateral play is provided to prevent the key cap 1 from jamming.
  • the spring elements 2 are supported on a stop surface which is formed by a light guide 7 which has a correspondingly designed bore for receiving the pin 5 of the key cap 1.
  • the light guide 7 serves to supply the light to the numbers or symbols in the key cap 1.
  • the key cap 1 is pressed with its pin 5 onto the key 8 and is reset by the four spring elements 2 attached laterally to the key cap 1 in the exemplary embodiment.
  • the four spring elements 2 attached laterally to the key cap 1 in the exemplary embodiment.
  • the integrated spring elements simplify assembly considerably. The elimination of a separate spring not only simplifies assembly, but also reduces costs.

Landscapes

  • Push-Button Switches (AREA)
  • Telephone Set Structure (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Casings For Electric Apparatus (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)

Abstract

1. A key cap for a keyboard arranged in electrical communications technology apparatus, in particular the operating unit of a telephone installation, which key cap is inserted in an opening in the housing of the apparatus (6) and can be pressed through a pin (5) against a key (8) arranged in the interior of the housing in order to operate the key, and has prestressed, laterally arranged spring elements (2) which are extended longitudinally and abut against a stop face inside the housing, characterized in that the key cap (1), which can be inserted in the opening in the housing with lateral play, and which has a downwardly opening half-shell-shaped synthetic resin part (3) of rectangular shape, with a correspondingly shaped pin (5), has at least one side running parallel to the opening in the housing, a prestressed spring element (2) which is inclined towards the having (6) at an acute angle and projects beyond the half-shell-shaped synthetic resin part (3) at the side, and which spring is pressed against a stop face in the housing (6) and abuts against the inside of the housing wall, with the upper side of the stop faces formed by the spring elements (2), which stop faces have an increased diameter relative to the housing opening and project laterally ; and that the key cap (1) is stepped at its upper face and in its central raised part is provided with a recess with a figure or symbol corresponding to the marking formed by a transparent synthetic resin part (4) connected in light-conducting manner through a transparet synthetic resin part (4) which fills the interior space of the opaque half-shell-shaped synthetic resin part (3), with the pin (5) mounted on this transparent synthetic resin part (4).

Description

Die Erfindung bezieht sich auf eine Tastenkappe für eine in einem Gerät der elektrischen Nachrichtentechnik angeordnete Tastatur, insbesondere das Bediengerät einer Telefoneinrichtung, die in eine Gehäuseöffnung des Gerätes eingesetzt und über einen Zapfen gegen eine im Gehäuseinneren angeordnete Tastatur zu deren Betätigung andrückbar ist.The invention relates to a key cap for a keyboard arranged in a device of the electrical communication technology, in particular the operating device of a telephone device, which is inserted into a housing opening of the device and can be pressed via a pin against a keyboard arranged inside the housing to actuate it.

Telefoneinrichtungen benötigen zum Verbindungsaufbau von Gesprächen Bediengeräte mit Wähleinrichtungen, die bisher meist mit einer drehbaren Wählscheibe versehen sind. Es gibt aber auch Einrichtungen dieser Art und insbesondere Autotelefoneinrichtungen, die Bediengeräte mit Wahltastaturen aufweisen, durch welche der Wahlvorgang wesentlich erleichtert wird. Die Tastaturen sind dabei mit Ziffern oder Symbolen entsprechend ihrer Funktion versehen, die überwiegend aufgedruckt sind.To establish calls, telephone devices require operator panels with dialing devices, which have so far mostly been provided with a rotating dial. However, there are also devices of this type, and in particular car telephone devices, which have operating devices with dialing keyboards, by means of which the dialing process is made considerably easier. The keyboards are provided with numbers or symbols according to their function, most of which are printed.

Das Bediengerät einer Telefoneinrichtung kann entweder eine separate Einrichtung mit einem dazugehörigen Hörer sein, wie dies allgemein der Fall ist, oder aber ein Handapparat, in den die Wahl- und Anzeigeeinheiten integriert sind. In beiden Fällen sind Tastaturen erforderlich, die mittels in Gehäuseöffnungen eingesetzter Tastenkappen betätigt werden.The operating device of a telephone device can either be a separate device with an associated handset, as is generally the case, or a handset in which the dialing and display units are integrated. In both cases keyboards are required, which are actuated by means of key caps inserted into the housing openings.

Der Erfindung liegt die Aufgabe zugrunde, für solche Tastenkappen eine stabile und funktionssichere Führung im Gehäuse zu schaffen und eine gute Erkennung bzw. Lesbarkeit bei unterschiedlichen Lichtverhältnissen für Ziffern und Symbole zu gewährleisten.The invention has for its object to provide a stable and reliable guide for such key caps in the housing and to ensure good recognition or readability in different lighting conditions for numbers and symbols.

Diese Aufgabe wird gemäß der Erfindung in der Weise gelöst, daß die mit seitlichem Spiel in die Gehäuseöffnung einsetzbare Tastenkappe mit entsprechend ausgebildetem Zapfen an wenigstens einer, parallel zur Gehäuseöffnung verlaufenden Seite ein unter einem spitzen Winkel zum Gehäuse hin geneigtes, vorgespanntes Federelement aufweist, das an einer Anschlagfläche im Gehäuse abgestützt ist und mit der Oberseite der durch die Federelemente gebildeten, gegenüber der Gehäuseöffnung im Durchmesser vergrößerten, seitlich überstehenden Anlageflächenan der Gehäuseinnenwand anliegt.This object is achieved according to the invention in such a way that the key cap which can be inserted into the housing opening with lateral play and has a correspondingly configured pin on at least one side running parallel to the housing opening has a prestressed spring element which is inclined at an acute angle to the housing and which is on is supported on a stop surface in the housing and rests on the inside wall of the housing with the upper side of the laterally projecting contact surfaces formed by the spring elements and enlarged in diameter compared to the housing opening.

Vorteilhafte Ausgestaltungen und Weiterbildungen des Erfindungsgegenstandes sind in den Unteransprüchen angegeben.Advantageous refinements and developments of the subject matter of the invention are specified in the subclaims.

Nachstehend wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert.

  • Es zeigen Fig. 1 bis 4 eine Tastenkappe in zwei Seitenansichten, einer Draufsicht und einem Längsschnitt,
  • Fig. 5 eine Tastenkappe im eingebauten Zustand.
The invention is explained in more detail below on the basis of an exemplary embodiment shown in the drawing.
  • 1 to 4 show a key cap in two side views, a top view and a longitudinal section,
  • Fig. 5 shows a key cap in the installed state.

Die Tastenkappe 1 besteht aus einem nach unten offenen, halbschalenförmigen Kunststoffteil rechteckförmiger Gestalt, an dessen Längs- und Querseiten Federelemente 2 angebracht, vorzugsweise angespritzt sind. Diese Federelemente 2 sind an den Ecken der Tastenkappe 1 befestigt und verlaufen in einem spitzen Winkel gegen die horizontale Ebene nach unten, also zum Gehäuse 6 hin, in das sie eingesetzt werden. An der Oberseite ist die Tastenkappe 1 stufenförmig abgesetzt, wobei der mittlere, erhöhte Teil 3 mit einer Ausnehmung entsprechend der Ziffer oder dem Symbol versehen ist, mit der die Tastenkappe 1 gekennzeichnet werden soll. Die Ziffer bzw. das Symbol bestehen aus einem lichtdurchlässigen Kunststoff. Sie sind über ein Kunststoffteil 4, das den Innenraum der aus einem lichtundurchlässigen Kunststoff bestehenden Tastenkappe mit festem Sitz ausfüllt, mit einem an dem Kunststoffteil 4 angebrachten Zapfen 5 lichtleitend verbunden. Hierfür wird ein lichtsammelnder, fluoreszierend eingefärbter Kunststoff verwendet, der die vorteilhaften Eigenschaften in sich vereinigt, daß er sowohl bei Tag gut lesbar wie auch bei Nacht ausreichend von innen beleuchtbar und somit lesbar ist.The key cap 1 consists of a downwardly open, half-shell-shaped plastic part of rectangular shape, on the longitudinal and transverse sides of which spring elements 2 are attached, preferably molded on. These spring elements 2 are fastened to the corners of the key cap 1 and run at an acute angle against the horizontal plane downwards, that is to say towards the housing 6 in which they are inserted. The key cap 1 is stepped at the top, the middle, raised part 3 being provided with a recess corresponding to the number or symbol with which the key cap 1 is to be identified. The number or the symbol exist made of a translucent plastic. They are connected in a light-conducting manner to a pin 5 attached to the plastic part 4 via a plastic part 4, which fills the interior of the key cap made of an opaque plastic with a firm fit. For this purpose, a light-collecting, fluorescent-colored plastic is used, which combines the advantageous properties that it is easily legible both during the day and sufficiently illuminated from inside and thus legible at night.

Fig. 5 zeigt die vorstehend beschriebene Tastenkappe 1 im eingebauten Zustand. Mehrere Tastenkappen sind zweckmäßig in einem Raster angeordnet und mit den ihrer Funktion entsprechenden Symbolen versehen. Die zugehörigen Tasten 8 sind im gleichen Raster beispielsweise auf einer Leiterplatte 10 angebracht und im dargestellten Beispiel über Lötanschlüsse 9 eingelötet.Fig. 5 shows the key cap 1 described above in the installed state. Several keycaps are expediently arranged in a grid and provided with the symbols corresponding to their function. The associated buttons 8 are mounted in the same grid, for example on a printed circuit board 10 and soldered in the example shown via solder connections 9.

Die Tastenkappe 1 ist in die Öffnung eines Gehäuses 6 eingesetzt. Hierbei ist ein seitliches Spiel vorgesehen, um ein Klemmen der Tastenkappe 1 zu verhindern. Mit der Oberseite der seitlich angebrachten Federelemente 2 liegt die Tastenkappe 1 an der Gehäuseinnenwand an. Die Federelemente 2 sind an einer Anschlagfläche abgestützt, die von einem Lichtleiter 7 gebildet wird, der eine entsprechend ausgebildete Bohrung zur Aufnahme des Zapfens 5 der Tastenkappe 1 aufweist. Der Lichtleiter 7 dient der Zuführung des Lichtes an die Ziffern bzw. Symbole in der Tastenkappe 1.The key cap 1 is inserted into the opening of a housing 6. Here, a lateral play is provided to prevent the key cap 1 from jamming. With the top of the laterally attached spring elements 2, the key cap 1 rests on the inner wall of the housing. The spring elements 2 are supported on a stop surface which is formed by a light guide 7 which has a correspondingly designed bore for receiving the pin 5 of the key cap 1. The light guide 7 serves to supply the light to the numbers or symbols in the key cap 1.

Zur Betätigung wird die Tastenkappe 1 mit ihrem Zapfen 5 auf die Taste 8 gedrückt und durch die im Ausführungsbeispiel vier an der Tastenkappe 1 seitlich angebrachten Federelemente 2 zurückgestellt. Durch diese aus einem entsprechend elastischen Kunststoff bestehenden Federelemente 2 ist auch gewährleistet, daß die Tastenkappen nicht im Gehäuse klappern und ein beim Fahren unerwünschtes Geräusch entsteht. Für die Montage ergibt sich durch die integrierten Federelemente eine wesentliche Vereinfachung. Der Wegfall einer separaten Feder bringt neben einer Vereinfachung beim Aufbau auch eine Kostenreduzierung.For actuation, the key cap 1 is pressed with its pin 5 onto the key 8 and is reset by the four spring elements 2 attached laterally to the key cap 1 in the exemplary embodiment. Through this consisting of a corresponding elastic plastic Federele Mente 2 is also ensured that the key caps do not rattle in the housing and an undesirable noise occurs when driving. The integrated spring elements simplify assembly considerably. The elimination of a separate spring not only simplifies assembly, but also reduces costs.

Claims (10)

1. Tastenkappe für eine in einem Gerät der elektrischen Nachrichtentechnik angeordnete Tastatur, insbesondere das Bediengerät einer Telefoneinrichtung, die in eine Gehäuseöffnung des Gerätes eingesetzt und über einen Zapfen gegen eine im Gehäuseinneren angeordnete Taste zu deren Betätigung andrückbar ist,
dadurch gekennzeichnet,
daß die mit seitlichem Spiel in die Gehäuseöffnung einsetzbare Tastenkappe mit entsprechend ausgebildetem Zapfen an wenigstens einer, parallel zur Gehäuseöffnung verlaufenden Seite ein unter einem spitzen Winkel zum Gehäuse hin geneigtes, vorgespanntes Federelement aufweist, das an einer Anschlagfläche im Gehäuse abgestützt ist und mit der Oberseite der durch die Federelemente gebildeten, gegenüber der Gehäuseöffnung im Durchmesser vergrößerten, seitlich überstehenden Anlageflächen an der Gehäuseinnenwand anliegt.1. Key cap for a keyboard arranged in a device of the electrical communication technology, in particular the operating device of a telephone device, which is inserted into a housing opening of the device and can be pressed against a key arranged inside the housing to actuate it,
characterized,
that the key cap, which can be inserted into the housing opening with lateral play, with a correspondingly configured pin on at least one side running parallel to the housing opening has a prestressed spring element which is inclined at an acute angle to the housing and is supported on a stop surface in the housing and with the top of the formed by the spring elements, with respect to the housing opening enlarged in diameter, laterally projecting contact surfaces on the housing inner wall. 2. Tastenkappe nach Anspruch 1,
dadurch gekennzeichnet,
daß die Federelemente angespritzt sind.2. Keycap according to claim 1,
characterized,
that the spring elements are molded. 3. Tastenkappe nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die Federelemente aus einem elastischen Kunststoff bestehen.3. Key cap according to claim 1 or 2,
characterized,
that the spring elements consist of an elastic plastic. 4. Tastenkappe nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß sie mit Symbolen entsprechend ihrer Funktion versehen ist.4. key cap according to one of claims 1 to 3,
characterized,
that it is provided with symbols according to its function. 5. Tastenkappe nach Anspruch 4,
dadurch gekennzeichnet,
daß die Symbole aus einem lichtdurchlässigen Kunststoff bestehen und von einem lichtundurchlässigen Kunststoff der Tastatur umgeben sind.5. key cap according to claim 4,
characterized,
that the symbols are made of a translucent plastic and an opaque plastic the keyboard are surrounded. 6. Tastenkappe nach Anspruch 5,
dadurch gekennzeichnet,
daß der lichtdurchlässige Kunststoff aus einem lichtsammelnden, fluoreszierenden, eingefärbten Kunststoff besteht.6. key cap according to claim 5,
characterized,
that the translucent plastic consists of a light-collecting, fluorescent, colored plastic. 7. Tastenkappe nach Anspruch 5 oder 6,
dadurch gekennzeichnet,
daß die Symbole lichtleitend mit dem Zapfen verbunden sind und dieser in die Bohrung eines Lichtleiters eintaucht.7. key cap according to claim 5 or 6,
characterized,
that the symbols are light-guidingly connected to the pin and this dips into the bore of a light guide. 8. Tastenkappe nach Anspruch 7,
dadurch gekennzeichnet,
daß der Lichtleiter die Anschlagfläche für die Federelemente bildet.8. key cap according to claim 7,
characterized,
that the light guide forms the stop surface for the spring elements. 9. Tastenkappe nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß mehrere Tastenkappen in einem Raster entsprechend den zugehörigen, im Gehäuse angeordneten Tasten angebracht sind.9. Key cap according to one of the preceding claims,
characterized,
that several keycaps are attached in a grid corresponding to the associated keys arranged in the housing. 10. Tastenkappe nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Tasten auf einer Leiterplatte aufgebracht, z.B. eingelötet sind.10. Key cap according to one of the preceding claims,
characterized,
that the keys are applied to a circuit board, for example soldered.
EP84115189A 1983-12-22 1984-12-12 Key cap for a keyboard mounted in a housing Expired EP0148437B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84115189T ATE32802T1 (en) 1983-12-22 1984-12-12 KEYCAP FOR AN ENCLOSED KEYBOARD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833346485 DE3346485A1 (en) 1983-12-22 1983-12-22 KEY COVER FOR A KEYBOARD ARRANGED IN A HOUSING
DE3346485 1983-12-22

Publications (2)

Publication Number Publication Date
EP0148437A1 true EP0148437A1 (en) 1985-07-17
EP0148437B1 EP0148437B1 (en) 1988-03-02

Family

ID=6217749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84115189A Expired EP0148437B1 (en) 1983-12-22 1984-12-12 Key cap for a keyboard mounted in a housing

Country Status (7)

Country Link
EP (1) EP0148437B1 (en)
AT (1) ATE32802T1 (en)
DE (2) DE3346485A1 (en)
DK (1) DK160381C (en)
ES (1) ES295022Y (en)
FI (1) FI80360C (en)
NO (1) NO165317C (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0196633A3 (en) * 1985-04-04 1989-03-15 Siemens Aktiengesellschaft Berlin Und Munchen Key cap for a keyboard disposed in a housing
EP0231007A3 (en) * 1986-01-31 1989-11-15 Siemens Aktiengesellschaft Push button
GB2366761A (en) * 2000-09-19 2002-03-20 Nec Corp Light diffusion unit for mobile telephone wherein a light guide is disposed between a substrate and a light diffuser
US6587332B2 (en) 2000-06-30 2003-07-01 Nokia Mobile Phones, Ltd. Structure of a housing for an electronic device
EP1788600A3 (en) * 2005-11-18 2009-02-25 Polymatech Co., Ltd. Key sheet
CN105438089A (en) * 2014-09-18 2016-03-30 福特全球技术公司 Plastic part with reduced reading defaults

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JP2768030B2 (en) * 1991-02-21 1998-06-25 日本電気株式会社 Flat keyboard switch
FR2683183B1 (en) * 1991-10-31 1995-02-03 Sextant Avionique PROCESS FOR FORMING A PAINTED PATTERN ON AN OBJECT MADE OF NON-ADHERENT MATERIAL.

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DE3112328A1 (en) * 1981-03-28 1982-10-07 Robert Bosch Gmbh, 7000 Stuttgart Push-button switch having a pushbutton in the form of a cap

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2415335A1 (en) * 1978-01-23 1979-08-17 Graniou Louis Electr Opto-electronic pushbutton with integrated signal lamp - has emitter diode and phototransistor to perform illumination and switching functions
FR2438294A2 (en) * 1978-10-05 1980-04-30 Graniou Louis Electr Opto-electronic touch switch with luminous indication - uses opaque plate adjacent to transparent plate behind light screen to prevent light escape
DE3112328A1 (en) * 1981-03-28 1982-10-07 Robert Bosch Gmbh, 7000 Stuttgart Push-button switch having a pushbutton in the form of a cap

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0196633A3 (en) * 1985-04-04 1989-03-15 Siemens Aktiengesellschaft Berlin Und Munchen Key cap for a keyboard disposed in a housing
EP0231007A3 (en) * 1986-01-31 1989-11-15 Siemens Aktiengesellschaft Push button
US6587332B2 (en) 2000-06-30 2003-07-01 Nokia Mobile Phones, Ltd. Structure of a housing for an electronic device
GB2366761A (en) * 2000-09-19 2002-03-20 Nec Corp Light diffusion unit for mobile telephone wherein a light guide is disposed between a substrate and a light diffuser
GB2366761B (en) * 2000-09-19 2003-01-22 Nec Corp Light Diffusion unit for keys of a mobile telephone keypad
EP1788600A3 (en) * 2005-11-18 2009-02-25 Polymatech Co., Ltd. Key sheet
CN105438089A (en) * 2014-09-18 2016-03-30 福特全球技术公司 Plastic part with reduced reading defaults

Also Published As

Publication number Publication date
ATE32802T1 (en) 1988-03-15
DK160381B (en) 1991-03-04
NO845074L (en) 1985-06-24
DE3346485A1 (en) 1985-07-04
FI80360C (en) 1990-05-10
ES295022U (en) 1986-11-01
NO165317C (en) 1991-01-23
DK613484D0 (en) 1984-12-20
DK160381C (en) 1991-08-12
FI845093A0 (en) 1984-12-21
ES295022Y (en) 1987-07-16
FI845093L (en) 1985-06-23
DK613484A (en) 1985-06-23
FI80360B (en) 1990-01-31
DE3469636D1 (en) 1988-04-07
EP0148437B1 (en) 1988-03-02
NO165317B (en) 1990-10-15

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