EP0614204B1 - Schalterkappe für Drucktastenschalter - Google Patents
Schalterkappe für Drucktastenschalter Download PDFInfo
- Publication number
- EP0614204B1 EP0614204B1 EP94102939A EP94102939A EP0614204B1 EP 0614204 B1 EP0614204 B1 EP 0614204B1 EP 94102939 A EP94102939 A EP 94102939A EP 94102939 A EP94102939 A EP 94102939A EP 0614204 B1 EP0614204 B1 EP 0614204B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switch cap
- switch
- cover
- cap according
- fastening
- 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.)
- Expired - Lifetime
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
- H01H2215/00—Tactile feedback
- H01H2215/004—Collapsible dome or bubble
- H01H2215/012—Positioning of individual dome
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2215/00—Tactile feedback
- H01H2215/004—Collapsible dome or bubble
- H01H2215/02—Reversed domes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2229/00—Manufacturing
- H01H2229/064—Eliminating tolerances
Definitions
- the invention relates to a switch cap according to the preamble of Claim 1.
- Switch caps made of a plastic injection molding compound or the like are in Pushbutton switches as actuators and reset elements for the pushbutton inserted.
- JP-A-04 137 414 (closest prior art) and GB-A-2 039 417 there is further one out Rubber material or silicone rubber existing switch cap shown, where the lifting movement through the cover towards the base base he follows. With this switch cap there is an attachment on the cover arranged.
- the approach according to JP-A-04 137 414 consists of several tapered protrusions during the approach after the GB-A-2 039 417 from a hollow body with elastic wall parts consists.
- the attachment flips over, with what a stroke extension to improve the feeling of actuation given by the user.
- JP-A-04 137 414 and GB-A-2 039 417 means for Extension of the stroke for a switch cap described, if this is not sufficient. However, there is no indication for that automatic compensation of tolerances during assembly in one Push button switch, in particular for a switch cap, in which the Actuated by the base base towards the cover, given.
- the invention has for its object a switch cap type mentioned in such a way that a independent compensation of installation-related tolerances on the Switch cap is possible.
- Pushbutton switches can be made functionally reliable without rejects can, because of the installation position of the switch cap or push button Tolerances occurring do not affect the actual stroke of the Impact switch cap.
- Another advantage is that any Large additional overstroke by extending the advance path is achievable.
- the height of the Membrane and the base or cover determined Have proportions so that the one you want Specifications corresponding snap operation when the Switch cap occurs as well as a certain tactile feeling for the User is present during the switching process. Therefore Any stroke lengths are not always with conventional switch caps constructively.
- the resilient approach to the Switch cap according to the invention can be of any size design so that each desired lead and thus stroke can be achieved.
- a push button switch 1 can be seen in Fig. 6 and consists of a push button 2 shown only schematically, which in generally still provided with a mounting mimic, not shown and a switch cap 3.
- the switch cap 3 has one Base base 4 and has one compared to base base 4 narrower lid 7.
- the switch cap 3 has a Base base 4 and the cover 7 connecting flexible thin-walled Membrane 10 on.
- the base base 4 has the cover 7 on it facing surface a contact surface 9 for bridging on the Printed circuit board 6 fixed contacts 11 ', 11 ".
- the lifting movement the base cap then actuates the switch cap 3 4 in the direction 24 to the cover 7.
- the contact surface 9 can be made from a conductive layer of coal varnish, silver varnish, gold varnish or the like. consist.
- the switch cap 3 frustoconical, the base base 4 a can have a circular basic cross section.
- the lid 7 is in the essentially cylindrical and the membrane 10 as Truncated cone surface formed.
- the base cap 4 and the cover 7 are in the case of the switch cap 3 due to the massive shape, relatively rigid and rigid.
- the flexible membrane 10, however, is due to its thin walls very elastic.
- pushbutton 2 see Fig. 6
- a force acts on the acting as an actuator Switch cap 3 on.
- the base base 4 is pressed down, the Contact surface 9 with those located on the circuit board 6 Fixed contacts 11 ', 11 "together, the contact surface 9 the bridges two fixed contacts 11 ', 11 ", so that the electrical Contact is closed. If pushbutton 2 is released, it has an effect the switch cap 3 due to the spring force of the elastic membrane 10 as a reset element and the base base 4 returns to his original position back.
- the switch cap 3 consists of a plastic injection molding compound or the like. preferably a thermoplastic elastomer, and is in Injection molding process made.
- A has proven to be particularly suitable So-called block copolymer, which consists of a hard crystalline segment made of polybutylene terephthalate and a soft one amorphous segment based on long-chain polyether glycols.
- block copolymer which consists of a hard crystalline segment made of polybutylene terephthalate and a soft one amorphous segment based on long-chain polyether glycols.
- HYTREL a plastic injection molding compound distributed by the Du Pont company.
- the stroke h specified in the design by the switch cap 3 is as can be seen from FIG. 1, by the distance of the contact surface 9 determined by the fixed contacts 11 ', 11 "in the unactuated state.
- By tolerances in the installation position of the push button 2 and Switch cap 3 in the push button switch it can happen that the push button 2 already in the unactuated state on the base base 4 acts, so that this part of his stroke movement has traveled. However, this undesirably shortens the total available stroke h.
- actuating push button 2 has base base 4 the surface facing away from the cover 7 an extension 12 which resiliently in Direction 24 of the lifting movement is configured.
- Fig. 5 in a schematic diagram three push button switches la, 1b, 1c with different and thus tolerant installation position seen in the unactuated state.
- the Push buttons 2a, 2b, 2c differently the approaches 12a, 12b, 12c greatly deformed in the direction of the lifting movement while the position the contact surfaces 9a, 9b, 9c of the switch caps 3a, 3b, 3c and thus nor the size of the stroke h of the switch caps 3a, 3b, 3c changed.
- Fig. 2 is the force-displacement diagram for the Switch cap 3 shown.
- the approach 12 is first deformed, due to its spring action, the required force F in Dependence on the actuation path s approximately linear according to the curve branch 25 increases.
- the actuating force F very strongly corresponding to the curve branch 26 up to the actuation path s2 increases.
- the membrane snaps 10, so that the force F up to the actuation path s3 according to the curve branch 27 drops.
- the contact surface 9 bridges the fixed contacts 11 ', 11 ", the contact surface 9 resting on the printed circuit board 6, so that with further actuation the actuating force F is very steep increases, as shown with the curve branch 28.
- the approach 12 can be designed so that it has a lower spring force than that which is caused by the elasticity of the membrane 10 has.
- a fastening part 30 may be arranged, the such is designed so that it is in a recess 31 as the carrier part serving circuit board 6 can be used latching.
- the fastening part 30 centrally and positively into the Recess 31 arranged appropriately.
- the fastening part 30 is a separate part in FIG Shape of a pin that has a shaft 32 with a round cross section and a head arranged on the side opposite the cover 7 33 owns.
- the recess 31 in the circuit board 6 continues from a through hole is formed.
- the shaft 32 is adapted in cross section to the recess 31, while the head 33 is somewhat larger in cross section than the recess 31.
- the Fastening part 30 is now inserted into the recess 31 that the head 33 rests on the underside 34 of the circuit board 6.
- the fastening part 30 has on the head 33 facing away from it End of a fastening button 35.
- the fastening part 30 is such from the base base 4 facing side into an opening 36 of the Cover 7 (see Fig. 1) used that the fastening part 30th is held on the cover 7 by the fastening button 35.
- a hard plastic produce for example a polycarbonate, polyamide, Polyacetal, polyester, polybutylene terephthalate or the like. It is also possible for the fastening part 30 to be made of metal to manufacture.
- the fastening part 30 is elastically resilient be trained. This is achieved in that the shaft 32 with a slot 37, which also passes through the head 33, is provided. At the Introducing the shaft 32 into the recess 31 can Reduce the cross section of the head 33 due to the slot 37, see above that this can be easily passed through the recess 31 can. Once the head 33 the bottom 34 of the circuit board 6th has reached, the head 33 springs back to its original size apart and the fastening part 30 is latching into the recess 31 used.
- a switch cap 3 In the manufacture of a switch cap 3 according to the embodiment 6 is expediently the fastening part 30 at the same time manufactured with a conveyor belt 38 in the injection molding process, as in Fig. 7 can be seen in more detail. Two each on the conveyor belt 38 located fasteners 30 have the same distance d from each other.
- a holding part 39 between the fastening button 35 and the conveyor belt 38 injection molded, being at the transition a predetermined breaking point between the fastening button 35 and the holding part 39 40 is located.
- Transport holes 41 are introduced at regular intervals. With help this transport holes 41 will be the conveyor belt 38 with the located fastening parts 30 in another Machined station where the switch caps 3 on the Fastening parts 30 are attached, as in Fig. 7 based on the fastening part 30 on the right is shown. Alternative is it is also possible in this processing station, the fastening part 30 with the switch cap 3.
- switch caps 3 After the switch caps 3 have been fitted onto the fastening part 30 then the switch caps 3 with inserted fastening part 30 broken off at the predetermined breaking point 40 from the holding part 39 and can then later used in the circuit board 6 (see Fig. 6). On the other hand, it is of course also possible that Switch caps 3 with the fastener 30 inserted Feed conveyor 38 to another processing station, where they are inserted into the circuit board 6 and then where subsequently the holding part 39 is broken off.
- the invention is not limited to that described and illustrated Embodiments limited. Rather, it includes everyone professional training within the scope of the inventive concept. So can in particular the switch cap 3 provided with an extension 12 also used in keyboard arrangements with several single keys Find.
Landscapes
- Push-Button Switches (AREA)
Description
- Fig. 1
- einen Schnitt durch eine Schalterkappe,
- Fig. 2
- ein Kraft-Weg-Diagramm für die Schalterkappe,
- Fig. 3
- einen Schnitt durch eine Schalterkappe in modifizierter Form,
- Fig. 4
- eine Draufsicht auf die Schalterkappe gemäß Fig. 3,
- Fig. 5
- einen Schnitt durch eine Schalterkappe in einem weiteren Ausführungsbeispiel,
- Fig. 6
- einen Schnitt durch einen schematisch dargestellten Drucktastenschalter mit Schalterkappe in nochmals weiterer Ausführungsform und
- Fig. 7
- ein Transportband bei der Herstellung einer Schalterkappe gemäß Fig. 6.
- 1:
- Drucktastenschalter
- 1a, 1b, 1c:
- Drucktastenschalter (in eingebautem, toleranzbehaftetem Zustand)
- 2, 2a, 2b, 2c:
- Druckknopf
- 3, 3a, 3b, 3c:
- Schalterkappe
- 4:
- Basissockel
- 6:
- Leiterplatte
- 7:
- Deckel
- 9, 9a, 9b, 9c:
- Kontaktfläche
- 10:
- Membran
- 11', 11":
- Festkontakt (auf der Leiterplatte)
- 12,12a, 12b,12c:
- Ansatz (am Basissockel)
- 13:
- Aussparung
- 14,14', 14'':
- Segment (am Basissockel)
- 24:
- Richtung (der Hubbewegung)
- 25, 26, 27, 28:
- Kurvenast (bei Kraft-Weg-Diagramm)
- 30:
- Befestigungsteil
- 31:
- Aussparung
- 32:
- Schaft
- 33:
- Kopf
- 34:
- Unterseite (der Leiterplatte)
- 35:
- Befestigungsknopf
- 36:
- Öffnung (im Deckel)
- 37:
- Schlitz
- 38:
- Transportband
- 39:
- Halteteil
- 40:
- Sollbruchstelle
- 41:
- Transportloch
Claims (17)
- Schalterkappe (3) aus einer Kunststoff-Spritzmasse oder dergleichen als Betätigungsorgan und Rückstellelement für einen Drucktastenschalter (1), die einen Basissockel (4), einen gegenüber dem Basissockel (4) schmaleren Deckel (7) und eine den Basissockel (4) und den Deckel (7) verbindende flexible dünnwandige Membran (10) aufweist, wobei der Deckel (7) mit seiner Stirnseite auf einem Trägerteil, wie einer Leiterplatte (6) angeordnet ist, der Basissockel (4) an seiner dem Deckel (7) zugewandten Fläche eine Kontaktfläche (9) zur Überbrückung von auf dem Trägerteil befindlichen Festkontakten (11', 11") besitzt und die Hubbewegung zur Betätigung der Schalterkappe (3) durch den mit einer Betätigungskraft beaufschlagbaren, gegenüber dem Deckel (7) breiteren Basissockel (4) in Richtung zum Deckel (7) erfolgt,wobei der Basissockel (4) an der dem Deckel (7) abgewandten Fläche einen Ansatz (12) besitzt,der federnd in Richtung (24) der Hubbewegung ausgestaltet ist,wobei der Ansatz (12) eine geringere Federkraft als diejenige, die durch die Elastizität der Membran (10) hervorgerufen ist, besitzt,und wobei in unbetätigtem Zustand des Drucktastenschalters (1) lediglich eine Verformung des Ansatzes (12) erfolgt.
- Schalterkappe nach Anspruch 1, dadurch gekennzeichnet, daß eine Aussparung (13) im Ansatz (12) angebracht ist.
- Schalterkappe nach Anspruch 2, dadurch gekennzeichnet, daß der Querschnitt der Aussparung (13) dreiecksförmig ist.
- Schalterkappe nach Anspruch 2, dadurch gekennzeichnet, daß der Querschnitt der Aussparung (13) trapezförmig ist.
- Schalterkappe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Ansatz (12) einstückig am Basissockel (4) angespritzt ist.
- Schalterkappe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Ansatz (12) kreisringförmig ausgestaltet ist.
- Schalterkappe nach Anspruch 6, dadurch gekennzeichnet, daß die Aussparung (13) durchgehend kreisringförmig ausgestaltet ist.
- Schalterkappe nach Anspruch 6 und 7, dadurch gekennzeichnet, daß der Ansatz (12) in etwa die Form einer Tellerfeder besitzt.
- Schalterkappe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Ansatz aus einzelnen, nicht durchgehenden Segmenten (14, 14', 14") besteht.
- Schalterkappe nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Schalterkappe (3) aus einem thermoplastischen Elastomer besteht.
- Schalterkappe nach Anspruch 10, dadurch gekennzeichnet, daß es sich bei dem thermoplastischen Elastomer um ein Blockcopolymer aus einem harten kristallinen Segment aus Polybutylen-Terephtalat und einem weichen amorphen Segment auf der Basis langkettiger Polyetherglykole handelt.
- Schalterkappe nach einem der Ansprüche 1 bis 11 zur Anordnung an einem Trägerteil, wie einer Leiterplatte (6), dadurch gekennzeichnet, daß am Deckel (7) an der dem Basissockel (4) abgewandten Fläche ein Befestigungsteil (30) angeordnet ist, das derart ausgestaltet ist, daß es in einer vorzugsweise als im Trägerteil durchgehenden Bohrung ausgebildeten Aussparung (31) des Trägerteils rastend einsetzbar ist, wobei das Befestigungsteil (30) vorzugsweise formschlüssig in die Aussparung (31) passend und zentral am Deckel (7) angeordnet ist.
- Schalterkappe nach Anspruch 12, dadurch gekennzeichnet, daß das Befestigungsteil (30) als Stift ausgebildet ist, der einen Schaft (32) mit vorzugsweise rundem Querschnitt und einen an der dem Deckel (7) gegenüberliegenden Seite angeordneten Kopf (33) besitzt, wobei der Schaft (32) querschnittlich der Aussparung (31) angepaßt ist, während der Kopf (33) querschnittlich größer als die Aussparung (31) ist, und daß der Stift insbesondere als separates Teil mit einem Befestigungsknopf (35) ausgebildet ist, indem der Stift derart von der dem Basissockel (4) zugewandten Seite in eine Öffnung (36) des Deckels (7) eingesetzt ist, daß der Stift durch den Befestigungknopf (35) am Deckel (7) festgehalten ist.
- Schalterkappe nach Anspruch 12 oder 13, dadurch gekennzeichnet, daß das Befestigungsteil (30) elastisch federnd ausgebildet ist, indem der Schaft (32) mit einem Schlitz (37) versehen ist.
- Schalterkappe nach Anspruch 12, 13 oder 14, dadurch gekennzeichnet, daß das Befestigungsteil (30) aus hartem Kunststoff, wie Polycarbonat, Polyamid, Polyacetal, Polyester, Polybutylen-Terephtalat o. dgl., oder aus Metall besteht.
- Verfahren zur Herstellung einer Schalterkappe nach Anspruch 12, 13, 14 oder 15, dadurch gekennzeichnet, daß das Befestigungsteil (30) mit einem vorzugsweise Transportlöcher (41) in regelmäßigen Abständen aufweisenden Transportband (38) im Spritzgießverfahren hergestellt wird, wobei zwischen je zwei an dem Transportband (38) befindlichen Befestigungsteilen (30) derselbe Abstand (d) besteht, und die Schalterkappen (3) in einer weiteren Bearbeitungsstation auf die Befestigungsteile (30) aufgesteckt werden oder die Befestigungsteile (30) mit einer Schalterkappe (3) umspritzt werden.
- Verfahren nach Anspruch 16, dadurch gekennzeichnet, daß bei der Herstellung des Befestigungsteils (30) ein Halteteil (39) zwischen dem Befestigungsknopf (35) und dem Transportband (38) angespritzt wird, wobei am Übergang zwischen dem Befestigungsknopf (35) und dem Halteteil (39) eine Sollbruchstelle (40) angebracht wird.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4306430 | 1993-03-02 | ||
DE4306430 | 1993-03-02 | ||
DE4342966 | 1993-12-16 | ||
DE4342966A DE4342966A1 (de) | 1993-03-02 | 1993-12-16 | Schalterkappe für Drucktastenschalter |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0614204A2 EP0614204A2 (de) | 1994-09-07 |
EP0614204A3 EP0614204A3 (de) | 1994-12-14 |
EP0614204B1 true EP0614204B1 (de) | 1999-04-14 |
Family
ID=25923572
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94102939A Expired - Lifetime EP0614204B1 (de) | 1993-03-02 | 1994-02-26 | Schalterkappe für Drucktastenschalter |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0614204B1 (de) |
DE (2) | DE4342966A1 (de) |
ES (1) | ES2132268T3 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9412474U1 (de) * | 1994-08-03 | 1994-12-08 | AutoAir Klimaanlagen GmbH, 47574 Goch | Klimaschaltereinheit |
DE10025688B4 (de) * | 2000-05-24 | 2010-07-29 | Leopold Kostal Gmbh & Co. Kg | Einrichtung zur Betätigung von Funktionselementen |
DE10037142B4 (de) * | 2000-07-29 | 2005-04-07 | Leopold Kostal Gmbh & Co Kg | Elektrisches Schaltelement |
JP4039030B2 (ja) * | 2001-10-29 | 2008-01-30 | 松下電器産業株式会社 | プッシュオンスイッチ |
CN109456577A (zh) * | 2017-09-06 | 2019-03-12 | 浙江台州多邦高分子材料科技有限公司 | 一种高分子弹性体弹簧 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH645205A5 (de) * | 1978-12-01 | 1984-09-14 | Maag Gummi | Schaltmatte. |
JPS58117615A (ja) * | 1981-12-29 | 1983-07-13 | 信越ポリマ−株式会社 | 押釦スイツチ用押圧制御部材 |
DE3335582A1 (de) * | 1983-09-30 | 1985-04-18 | Siemens AG, 1000 Berlin und 8000 München | Tastatur fuer fernsprechgeraete |
JPH04137414A (ja) * | 1990-09-28 | 1992-05-12 | Alps Electric Co Ltd | 押釦スイツチのゴム接点 |
DE4112754C2 (de) * | 1991-04-19 | 1999-06-02 | Marquardt Gmbh | Drucktastenschalter |
DE9108530U1 (de) * | 1991-07-11 | 1991-11-28 | Chen, Pao-Chin, Taipeh/T'ai-pei | Tastatur für einen Computer |
-
1993
- 1993-12-16 DE DE4342966A patent/DE4342966A1/de not_active Withdrawn
-
1994
- 1994-02-26 DE DE59408099T patent/DE59408099D1/de not_active Expired - Lifetime
- 1994-02-26 ES ES94102939T patent/ES2132268T3/es not_active Expired - Lifetime
- 1994-02-26 EP EP94102939A patent/EP0614204B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0614204A2 (de) | 1994-09-07 |
EP0614204A3 (de) | 1994-12-14 |
DE4342966A1 (de) | 1994-09-08 |
ES2132268T3 (es) | 1999-08-16 |
DE59408099D1 (de) | 1999-05-20 |
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