EP0347375B1 - Push button disposition on a circuit board - Google Patents
Push button disposition on a circuit board Download PDFInfo
- Publication number
- EP0347375B1 EP0347375B1 EP19890810409 EP89810409A EP0347375B1 EP 0347375 B1 EP0347375 B1 EP 0347375B1 EP 19890810409 EP19890810409 EP 19890810409 EP 89810409 A EP89810409 A EP 89810409A EP 0347375 B1 EP0347375 B1 EP 0347375B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- snap
- circuit board
- protective cap
- action disc
- printed circuit
- 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.)
- Revoked
Links
Images
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
- H01H13/7006—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 comprising a separate movable contact element for each switch site, all other elements being integrated in layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2205/00—Movable contacts
- H01H2205/016—Separate bridge contact
- H01H2205/024—Means to facilitate positioning
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2209/00—Layers
- H01H2209/01—Increasing rigidity; Anti-creep
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2213/00—Venting
- H01H2213/002—Venting with external pressure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2219/00—Legends
- H01H2219/002—Legends replaceable; adaptable
- H01H2219/014—LED
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2221/00—Actuators
- H01H2221/064—Limitation of actuating pressure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2221/00—Actuators
- H01H2221/07—Actuators transparent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2227/00—Dimensions; Characteristics
- H01H2227/002—Layer thickness
- H01H2227/006—Spacer
Definitions
- the invention relates to a push button arrangement on a printed circuit board.
- the switch contact is generated via a snap disk, which is embedded in a spacer and is protected against external attack by a cover.
- a device according to the preamble of claim 1 is known from US Pat. No. 4,365,120.
- This patent shows pushbuttons on a printed circuit board which have a circular snap disk with a recess in the center for the passage of a light source.
- the light source protrudes into a protective cap located above the snap disk, which is supported on the snap disk with an annular surface.
- a disadvantage of this arrangement is that all actuating forces are transmitted to the contact surfaces, including those that are much too large.
- the protective cap will tilt on one side if an eccentric attack force occurs on the periphery, as is the case when operating with pointed writing tools.
- U.S. Pat. 4,056,701 pushbuttons equipped with light-emitting diodes are shown, which are designed in a sophisticated and intended for large series. With this arrangement, a uniform keypad in flat design is achieved, the keys of which are illuminated when actuated or by feeding from the outside.
- a disadvantage of this construction is that it has four carrier bodies (58, 46, 22, 12), which requires precise processing and coverage of the processed fields. Small series with individual keypads can no longer be produced economically using this technology.
- the buttons, the lighting of which is not necessary, do not have to be actuated on their associated light-emitting diodes, but nevertheless have to be carried out in this complex design.
- the patent specification FR 2 280 291 shows pushbuttons on a printed circuit board with spiral springs which are pressed onto a contact via key heads. Every push of a button, no matter how big, is transferred to the contact.
- the spiral springs project in their longitudinal direction considerably beyond the width of the keys, which limits the spacing of the keys, and they are used to operate the key body when actuated with a central bore. Eccentric actuation forces can generate longitudinal displacement forces on the spiral spring.
- the object of the invention is to provide externally protected pushbuttons with few individual elements in a flat design on a printed circuit board.
- the advantage of the invention is that the operator-related loads on the cover foils and the snap disks are limited in such a way that no overloading and destruction occur.
- a pushbutton arrangement is shown on a printed circuit board, which in its basic structure consists of a printed circuit board 1 with printed conductors 6 and a snap disk 5, which rests on the one hand on the printed conductors 6 and on the printed circuit board 1 and on the other hand in its movement from an overlapping one Protective cap 4 is limited, which is held by a cover sheet 3 in an opening 12 of the spacer 2.
- the electrically insulating spacer 2 provided with openings 12 is firmly connected to the printed circuit board 1 via a binder and to the cover film 3 on the opposite side.
- the deformation of the cover film 3 and the snap disk 5 is limited by the freedom of movement of the protective cap 4 located in the opening 12 of the spacer 2.
- the protective cap 4 has an outer edge 13 projecting toward the printed circuit board 1, so that the snap disk 5 is enclosed between the protective cap 4 and the printed circuit board 1 when the pressure mask arrangement is actuated, and a path limitation is created.
- the protective cap 4 only engages on a single, dome-shaped engagement surface in the middle of the snap disk 5.
- the position of the snap disk 5 is secured by two projecting tabs 11, each of which engages in a recess 10 of the circuit board 1.
- a light source 9 can be attached under the printed circuit board 1, which illuminates the latter through an opening 7 in the printed circuit board 1 and through an opening 8 in the snap disk 5 when the protective cap 4 and cover film 3 are made transparent.
- the thickness of the spacer 2 is made greater than 1 mm.
Landscapes
- Push-Button Switches (AREA)
- Switch Cases, Indication, And Locking (AREA)
Description
Die Erfindung bezieht sich auf eine Drucktastenanordnung auf einer Leiterplatte. Bei solchen Anwendungen, wie sie beispielsweise im Schalttafelbau verwendet werden, wird der Schaltkontakt über eine Schnappscheibe erzeugt, die in einem Distanzstück eingebettet ist und durch eine Abdeckung gegen äusseren Angriff geschützt wird.The invention relates to a push button arrangement on a printed circuit board. In such applications, such as those used in control panel construction, the switch contact is generated via a snap disk, which is embedded in a spacer and is protected against external attack by a cover.
Mehrere dieser Drucktastenanordnungen sind im allgemeinen zu Tastenfeldern auf Leiterplatten zusammengefasst.Several of these push button arrangements are generally combined into key fields on printed circuit boards.
Eine Vorrichtung gemäß dem Oberbegriff des Anspruchs 1 ist aus der Patentschrift U.S. 4,365,120 bekannt. Diese Patentschrift zeigt Drucktasten auf einer Leiterplatte, die eine kreisrunde Schnappscheibe mit einer Ausnehmung im Zentrum für das Durchführen einer Lichtquelle aufweisen. Die Lichtquelle ragt bis in eine über der Schnappscheibe liegende Schutzkappe hinein, welche sich mit einer Ringfläche auf der Schnappscheibe abstützt. Ein Nachteil dieser Anordnung besteht darin, dass alle Betätigungskräfte auf die Kontaktflächen übertragen werden also auch solche, die viel zu gross sind. Im weiteren besteht die Gefahr, dass die Schutzkappe einseitig verkantet, wenn an der Peripherie eine exzentrische Angriffskraft wie bei der Unsitte der Betätigung mit spitzen Schreibwerkzeugen auftritt. Im weiteren wird eine Leiterbahn von der Rückseite der Leiterplatte unter die Schnappscheibe auf der Vorderseite geführt, was zwangsläufig eine Handlötstelle auf der Vorderseite oder bei einer unteren Kontaktscheibe (17), mit zur Rückseite durchsteckbaren Lötfahnen, Leiter auf der Rückseite der Leiterplatte voraussetzt.A device according to the preamble of
In der Patentschrift U.S. 4,056,701 sind mit Leuchtdioden bestückte Drucktasten gezeigt, die in einer ausgeklügelten und für Gross-Serien vorgesehenen Bauweise ausgeführt sind. Mit dieser Anordnung wird ein einheitliches Tastenfeld in Flachbauweise erreicht, dessen Tasten bei Betätigung oder durch Anspeisen von aussen erleuchtet sind. Ein Nachteil dieser Konstruktion ist, dass sie vier Trägerkörper (58, 46, 22, 12) aufweist, die eine exakte Bearbeitung und Ueberdeckung der bearbeiteten Felder voraussetzt. Klein-Serien mit individuellen Tastenfeldern sind in dieser Technik nicht mehr wirtschaftlich herzustellen. Die Tasten, deren Beleuchtung nicht notwendig ist, müssen zwar an ihren zugehörigen Leuchtdioden nicht angesteuert werden, aber trotzdem in dieser komplexen Bauform ausgeführt werden.U.S. Pat. 4,056,701 pushbuttons equipped with light-emitting diodes are shown, which are designed in a sophisticated and intended for large series. With this arrangement, a uniform keypad in flat design is achieved, the keys of which are illuminated when actuated or by feeding from the outside. A disadvantage of this construction is that it has four carrier bodies (58, 46, 22, 12), which requires precise processing and coverage of the processed fields. Small series with individual keypads can no longer be produced economically using this technology. The buttons, the lighting of which is not necessary, do not have to be actuated on their associated light-emitting diodes, but nevertheless have to be carried out in this complex design.
Die Patentschrift FR 2 280 291 zeigt Drucktasten auf einer Leiterplatte mit Biegefedern, die über Tastenköpfe auf einen Kontakt gedrückt werden. Jeder noch so grosser Tastendruck wird auf den Kontakt übertragen. Die Biegefedern stehen in ihrer Längsrichtung erheblich über die Breite der Tasten vor, was den Abstand der Tasten beschränkt, und sie werden beim Betätigen mit einer zentralen Bohrung zur Führung des Tastenkörpers benutzt. Exzentrische Betätigungskräfte können an der Biegefeder in Längsrichtung Verschiebekräfte erzeugen.The
Aufgabe der Erfindung ist es, nach aussen hin geschützte Drucktasten mit wenig Einzelelementen in Flachbauweise auf einer Leiterplatte anzubringen.The object of the invention is to provide externally protected pushbuttons with few individual elements in a flat design on a printed circuit board.
Diese Aufgabe wird mit den Kennzeichen von Anspruch 1 gelöst.This object is achieved with the characteristics of
Der Vorteil der Erfindung besteht darin, dass die bedienungsbedingten Belastungen der Abdeckfolien und der Schnappscheiben derart in Grenzen gehalten werden, dass keine Ueberbelastungen und Zerstörungen auftreten.The advantage of the invention is that the operator-related loads on the cover foils and the snap disks are limited in such a way that no overloading and destruction occur.
Die Unteransprüche 2 bis 4 stellen vorteilhafte Weiterbildungen der Erfindungen dar.The
Im folgenden wird die Erfindung anhand von einem Ausführungsbeispiel beschrieben.
- Fig. 1
- ist schematisch ein Schnitt in perspektivischer Darstellung durch eine erfindungsgemässe Drucktastenanordnung auf einer Leiterplatte und
- Fig. 2
- ist in verkleinertem Massstab eine Draufsicht ohne Abdeckfolie und ohne Schutzkappe.
- Fig. 1
- is a schematic sectional view in perspective through a push button arrangement according to the invention on a circuit board and
- Fig. 2
- is a plan view on a reduced scale without cover film and without protective cap.
In den Figuren ist eine Drucktastenanordnung auf einer Leiterplatte dargestellt, welche in ihrem grundsätzlichen Aufbau aus einer Leiterplatte 1 mit Leiterbahnen 6 und einer Schnappscheibe 5 besteht, die einerseits auf den Leiterbahnen 6 und auf der Leiterplatte 1 aufliegt und die andererseits in ihrer Bewegung von einer überdeckenden Schutzkappe 4 begrenzt ist, welche durch eine Abdeckfolie 3 in einem Durchbruch 12 des Distanzstückes 2 gehalten wird.In the figures, a pushbutton arrangement is shown on a printed circuit board, which in its basic structure consists of a printed
Das mit Durchbrüchen 12 versehene elektrisch isolierende Distanzstück 2 ist über einen Binder fest mit der Leiterplatte 1 und auf der Gegenseite mit der Abdeckfolie 3 verbunden. Die Deformation der Abdeckfolie 3 und der Schnappscheibe 5 ist durch den Bewegungsspielraum der im Durchbruch 12 des Distanzstückes 2 liegenden Schutzkappe 4 begrenzt. Die Schutzkappe 4 weist einen zur Leiterplatte 1 vorstehenden Aussenrand 13 auf, so, dass die Schnappscheibe 5 bei Betätigung der Drucktaskenanordnung zwischen Schutzkappe 4 und Leiterplatte 1 eingeschlossen ist und eine Wegbegrenzung entsteht. Die Schutzkappe 4 greift nur an einer einzigen, kalottenförmigen Angriffsfläche in der Mitte der Schnappscheibe 5 an.The electrically insulating
Die Lage der Schnappscheibe 5 wird durch zwei vorstehende Lappen 11 gesichert, von denen jeder in eine Ausnehmung 10 der Leiterplatte 1 eingreift. Unter der Leiterplatte 1 kann eine Lichtquelle 9 angebracht werden, die durch einen Durchbruch 7 der Leiterplatte 1 und durch einen Durchbruch 8 der Schnappscheibe 5 bei transparent ausgeführter Schutzkappe 4 und Abdeckfolie 3 letztere erleuchtet.The position of the
Trotz der Forderung nach möglichst flacher Bauweise wird die Dicke des Distanzstückes 2 grösser als 1 mm ausgeführt.Despite the requirement for the flatest possible construction, the thickness of the
Claims (4)
- A pushbutton arrangement on a printed circuit board (1),
consisting of a springy snap-action disc (5) which is arranged in an opening (12) in an electrically insulating distancepiece (2) and covered over in this opening (12) by a protective cap (4), the distancepiece (2) and the protective cap (4) being coated externally with a covering foil (3), characterized in that all of the conductors (6) for making contact in the region of the snap-action disc (5) are arranged on one side of the printed circuit board (1) next the snap-action disc (5), that the protective cap (4) exhibits an outer edge (13) which projects towards the snap-action disc (5) so that upon actuation of the arrangement the snap-action disc (5) is enclosed between the protective cap (4) and the printed circuit board (1) and without touching the snap-action disc (5) the outer edge (13) forms a limit to the travel of the snap-action disc (5) under compression, and that the protective cap (4) exhibits one single centrally-arranged hemispherical area of engagement with the snap-action disc. - A pushbutton arrangement as in Claim 1,
characterized in that the snap-action disc (5) is provided with at least two projecting tabs (11) each of which engages in a recess (10) in the printed circuit board (1). - A pushbutton arrangement as in Claim 1 or 2,
characterized in that the protective cap (4) and the covering foil (3) are transparent and that underneath the protective cap (4) the snap-action disc (5) and the printed circuit board (1) exhibit openings (7, 8) lying one above the other for light to pass through. - A pushbutton arrangement as in one of the Claims 1 to 3,
characterized in that the distancepiece (2) is made of a thickness greater than 1 mm in order to insert the protective cap (4).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH2271/88 | 1988-06-14 | ||
CH227188A CH676765A5 (en) | 1988-06-14 | 1988-06-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0347375A1 EP0347375A1 (en) | 1989-12-20 |
EP0347375B1 true EP0347375B1 (en) | 1993-09-15 |
Family
ID=4229866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890810409 Revoked EP0347375B1 (en) | 1988-06-14 | 1989-06-01 | Push button disposition on a circuit board |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0347375B1 (en) |
CH (1) | CH676765A5 (en) |
DE (1) | DE58905591D1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4139554A1 (en) * | 1991-10-14 | 1993-04-15 | Fela Mikrotechnik Ag | ELECTRIC KEY SWITCH |
DE4213084A1 (en) * | 1992-04-21 | 1993-01-07 | Bock Hans A Dipl Ing Tu | Key switch for mounting in vehicle steering wheel, console, or armrest - is operated by plastics elastic skin of upper surface, being formed as SMD, with conductor plate on solder side of cable distributor |
DE19823894C1 (en) * | 1998-04-18 | 2000-01-05 | Inovan Stroebe | Snap disc switch with fastener |
DE19847614A1 (en) * | 1998-10-15 | 2000-05-04 | Magenwirth Gmbh Co Gustav | Snap switch |
US6423918B1 (en) * | 2000-03-21 | 2002-07-23 | Lear Corporation | Dome switch |
DE10315202A1 (en) * | 2003-04-03 | 2004-10-14 | Leopold Kostal Gmbh & Co. Kg | Remote control for operating a locking device of a motor vehicle |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1472355A (en) * | 1974-07-24 | 1977-05-04 | Amp Inc | Switches for electrical assemblies |
US4056701A (en) * | 1976-07-08 | 1977-11-01 | Bowmar Instrument Corporation | Low profile lighted push button switch |
CH632112A5 (en) * | 1978-07-07 | 1982-09-15 | Sodeco Compteurs De Geneve | Push-button keypad and use of the same as a dialling keypad of a public telephone station |
DE2902769C2 (en) * | 1979-01-25 | 1982-12-09 | Rudolf Schadow Gmbh, 1000 Berlin | Push button switch |
US4365120A (en) * | 1981-04-13 | 1982-12-21 | Kb Denver, Inc. | Illuminated keyboard |
DE3145434A1 (en) * | 1981-11-16 | 1983-05-26 | Kundisch GmbH, 7730 Villingen-Schwenningen | Film keyboard with a pressure point |
-
1988
- 1988-06-14 CH CH227188A patent/CH676765A5/de not_active IP Right Cessation
-
1989
- 1989-06-01 DE DE89810409T patent/DE58905591D1/en not_active Revoked
- 1989-06-01 EP EP19890810409 patent/EP0347375B1/en not_active Revoked
Also Published As
Publication number | Publication date |
---|---|
DE58905591D1 (en) | 1993-10-21 |
CH676765A5 (en) | 1991-02-28 |
EP0347375A1 (en) | 1989-12-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2730763C3 (en) | Flat illuminated pushbutton switch | |
EP0234193B1 (en) | Switch arrangement | |
DE2559681C2 (en) | Actuating device for the selective closing of several electrical circuits | |
DE69406030T2 (en) | Membrane switch and air bag arrangement | |
EP0616344B1 (en) | Keyboard | |
DE2341521A1 (en) | PUSH BUTTON SWITCH | |
DE2365083B2 (en) | MANUAL PUSH BUTTON SWITCHING ELEMENT WITHIN A BUTTON SWITCHING MATRIX | |
DE2319042B2 (en) | KEYBOARD | |
DE4109033C2 (en) | Push button mechanism | |
DE2106732A1 (en) | Electric membrane keyboard | |
DE2235860A1 (en) | CONTROL UNIT WITH AT LEAST ONE ELECTRIC CONTACT CONTROL DEVICE | |
DE3820430C2 (en) | Push button assembly for a flat electronic device | |
DE2459464B2 (en) | KEYBOARD DEVICE | |
EP0347375B1 (en) | Push button disposition on a circuit board | |
DE3643124C2 (en) | ||
DE4118743A1 (en) | MULTIPLE SWITCH | |
DE2902357C2 (en) | Keypad having a plurality of pushbutton switches | |
EP3078046B1 (en) | Keyboard comprising multiple stabilized tile-shaped keys | |
EP0433814B1 (en) | Keyboard | |
DE2439697B2 (en) | PRESSURE SWITCH | |
DE19836793C2 (en) | Control element for the selective establishment of electrical contacts | |
DE2235898C3 (en) | Device for the manual input of information into data processing equipment | |
DE2730659C2 (en) | Push button switch | |
DE2655964A1 (en) | Keyboard system for communications consoles - has sprung contact elements with lugs spaced from stationary contacts on support plate | |
DE9205228U1 (en) | Membrane keyboard |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT |
|
17P | Request for examination filed |
Effective date: 19900504 |
|
17Q | First examination report despatched |
Effective date: 19920821 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
ITF | It: translation for a ep patent filed |
Owner name: ING. ZINI MARANESI & C. |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB IT |
|
REF | Corresponds to: |
Ref document number: 58905591 Country of ref document: DE Date of ref document: 19931021 |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19930924 |
|
ET | Fr: translation filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19940514 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19940516 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19940519 Year of fee payment: 6 |
|
PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
26 | Opposition filed |
Opponent name: TEMIC TELEFUNKEN MICROELECTRONIC GMBH Effective date: 19940614 |
|
RDAG | Patent revoked |
Free format text: ORIGINAL CODE: 0009271 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: PATENT REVOKED |
|
27W | Patent revoked |
Effective date: 19940923 |
|
GBPR | Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state |
Free format text: 940923 |