EP1552540A1 - Commutateur electrique a actionnement par pression de type cloquant et son procede de fabrication - Google Patents
Commutateur electrique a actionnement par pression de type cloquant et son procede de fabricationInfo
- Publication number
- EP1552540A1 EP1552540A1 EP03775454A EP03775454A EP1552540A1 EP 1552540 A1 EP1552540 A1 EP 1552540A1 EP 03775454 A EP03775454 A EP 03775454A EP 03775454 A EP03775454 A EP 03775454A EP 1552540 A1 EP1552540 A1 EP 1552540A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- base
- switching element
- plate
- actuator
- switching
- 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
Links
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
- H01H13/02—Details
- H01H13/26—Snap-action arrangements depending upon deformation of elastic members
- H01H13/48—Snap-action arrangements depending upon deformation of elastic members using buckling of disc springs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49105—Switch making
Definitions
- the present invention relates to an electrical switch with pressure actuation of the so-called "blistering" type, that is to say where the switching is effected by deflection, under the effect of an actuator, of an elastic conductive blistering dome. against two conductors to be connected. More particularly, the invention proposes in this context on the one hand an optimized design and assembly of the constituent parts of the switch, making it possible to improve the tactile performance of the latter, and on the other hand a judicious production and packaging method both of said parts and of the assembled switch.
- a typical application of the invention is the low voltage switching used for the control of services in a passenger compartment of a motor vehicle (window lifters, positioning of the seats, sunroof, radio, on-board computer, console controls, etc.) , where the switch is mounted directly on an electrical circuit board, for example a printed circuit.
- FIGS. 1 to 3 An example of a known blistering switch which is particularly advantageous in terms of ergonomics, reliability and ease of installation by robotic tools is described in French patent application FR-A-2 800 904 filed in the name of the company DAN.
- SA This blistering switch 1, shown in FIGS. 1 to 3, comprises a flexible and deformable actuator 2 which covers a switching element in the form of an elastic metal dome forming a blister 4, the latter being positioned just above an area switching 6 at which there are two end points 8 and 10 of respective tracks 12 and 14 of a printed circuit 16. These end points can thus be electrically connected by the blister 4 when the latter is bent towards the surface of the printed circuit under the action of a pressure transmitted by the actuator 2.
- the actuator 2 comprises a base 2a at an upper part 2b ending on an actuating pin 18 accessible by the user, on which the force necessary for the deformation of the blister 4 is exerted.
- the blister 4 is housed in the space 20 (FIG. 2) defined between the upper face of the printed circuit 16 and a curved internal face 22 of the actuator 2.
- the blister 4 rests on the printed circuit by several points d 'peripheral support 24 curved outwards, by which it is kept raised.
- the blister has a central incoming portion 26 plumb with one of the end points 8, with which it creates contact, the other end point 10 being in permanent contact with the blister near one of the points d peripheral support 24.
- the base of the actuator is annular and its periphery constitutes a sealing lip 28.
- the latter is housed in a groove 30 formed in sealing means constituted by a strapping 32 which is fixed to the printed circuit 16 by fixing lugs 34.
- the printed circuit 16 acts as a support for the strapping 32 and, thereby, the switching device as a whole 1.
- the strapping 32 is made of a rigid material relative to that of the actuator 2, and more particularly relative to the sealing lip 28.
- the groove 30 is constituted by a draft having a horizontal bearing 30a and a vertical bearing 30b so as to constitute support zones for the sealing lip 28 and thus improve the sealing and the insulation from the outside of the switching zone 6.
- the sealing lip is applied strongly at least on the horizontal surface 30a, which prevents any introduction of material into the space 20.
- the curved internal face 22 of the actuator is provided with four pairs of segments or lips 38, as shown in FIG. 3, each pair sandwiching a peripheral edge of the blister 4.
- the invention provides, according to a first aspect, a switching device intended for mounting on an electrical circuit board comprising contacts to be electrically connected during a switching, the device comprising a switching element associated with an actuator, making it possible to establish the electrical connection between these contacts when this element is deflected under a pressure transmitted by the actuator, the device being characterized in that it further comprises a base provided with retention means for retaining the switching element before mounting the device on the plate, the switching element being disengaged from these retention means when the device is mounted on the plate.
- the switching element is only supported by the plate when the device is mounted on it, the base then ensuring only a guiding function for the switching element .
- the switching element naturally disengages from the retention means under the effect of a thrust exerted on the switching element by the plate when the device is mounted on it.
- the switching element can be mounted floating vis-à-vis the base between a first position in which the switching element is in abutment against the retention means and a second position in which it is disengaged from the retention means , this second position being adopted automatically by the installation of the device on the plate.
- the switching element may comprise at least one appendage, the free end of which forms a hook, the retaining means having a stop for the hook preventing the switching element from being withdrawn by the face of the base facing the plate. .
- This appendage is preferably an elastic blade extending from a corner of the switching element and the end of which bears against an internal bearing of the base, allowing the switching element to be guided with respect to the base.
- the base can form a frame around the switching element, the peripheral wall of the frame having a contact edge intended to bear against the plate when the device is mounted on it.
- This contact edge can constitute a seal protecting the internal part, that is to say the part where the switching zone is located.
- the peripheral wall may have an edge, opposite the contact edge, intended to receive a base portion of the actuator.
- the actuator is a part of revolution.
- the device may further comprise a connecting piece intended on the one hand to retain the actuator on the base and on the other hand to ensure the mounting of the device on the plate.
- this connection piece fixes the device on the plate by gripping means ensuring a seamless fixing of the device on the plate.
- the gripping means form latching means intended to pass through at least one hole of the plate and to anchor against the face of the latter opposite to that on which the device is mounted.
- the connecting piece can hold a base portion of the sandwich actuator against the base.
- This connecting piece may include at least one pin, the end of which forms an anchoring means on the plate, and a part of which includes fixing means intended to cooperate with fixing means linked to the base.
- the base can be made in one piece from flexible plastic or elastomer.
- the switching element is a conductive element.
- the switching element is in the form of a dome, in particular a blistering dome, made of metal or comprising a metallization making it possible to provide the electrical connection.
- the invention relates to a method of manufacturing the device according to the first aspect, characterized in that at least one of the parts, and advantageously each of the parts, from the group comprising:
- the switching element, and - the base is manufactured on a carrier strip, and the part is connected to the carrier strip during assembly of the device, the carrier strip also serving as a means of conditioning the part between its manufacture and assembly of the device.
- the carrier strip of one of the parts of the group is also used for packaging the device once it has been assembled.
- the carrier strip used for packaging the assembled device is preferably used to supply a tool for mounting the device on its plate, this tool being of the strip feed type.
- the method can also comprise the steps, applied to the connecting piece when the latter is provided with pins, of:
- FIG. 1 already described, and an exploded perspective view of the switch and of a printed circuit shown partially and schematically, according to patent document FR-A-2 800 904,
- FIG. 2 already described, is a sectional view of the switch in FIG. 1 after mounting on a printed circuit
- FIG. 3 already described, is a plunging view on the interior of the actuator of the switch in FIG. 1, showing more particularly how the gripping means retain the blister,
- FIG. 4 is an exploded perspective view of a switch and a printed circuit according to a preferred embodiment of the invention
- FIG. 5 is a sectional view of the switch in FIG. 4 after mounting on a printed circuit
- FIG. 6a is a partial and simplified sectional view of the switch according to section VI-VI 'of Figure 4, showing the arrangement of the blister retention means vis-à-vis the base before mounting on the printed circuit, and
- FIG. 6b is a partial and simplified sectional view of the switch according to the VF -VF section of Figure 4, showing the arrangement of the blister retention means vis-à-vis the base after mounting on the circuit printed.
- the blistering type switch 40 according to the preferred embodiment of the invention consists of four parts which are superimposed on a central mounting axis A which is perpendicular to the plane of a printed circuit 16 intended to receive it:
- connection element 42 of metallic material of generally annular shape, forming a housing which covers the other three elements, provided with two pins 23 allowing anchoring in respective holes 44 of the printed circuit 16, - an actuator 2 made of flexible material, for example an elastomer, in the form of a part of revolution, comprising a peripheral base 2a and a raised central part 2b which forms a pusher passing through the central opening 42a of the connection element,
- a domed metallic type 4 conducting blister 4 which constitutes an example of a switching element ensuring the electrical connection between two conductive tracks 12, 14 of the printed circuit 16 when the switch is activated, and
- a base 46 in the form of a spacer which seals in a sealed manner on the printed circuit, provided with a central opening 46a through which the blister 4 can establish contact with the printed circuit. It also serves to retain the blister before mounting the switch on the printed circuit, and to support the base of the actuator.
- Blister 4 also called “blistering dome” or “dome”
- the other track 12 has a contact pad 8 plumb with the apex of the concave part of the blister.
- the actuator 2 comprises material filling all of its upper part 2b (FIG. 5). This material forms at its lower part a protruding face 2c of reduced section just above the top of the blister 4, intended to press on the latter to establish switching.
- the blister 4 has two radial tabs 48 extending from two of its diagonally opposite corners 4a.
- Each tab is in the form of an elastic blade directed towards the top with a slight inclination, the free edge forming a hook 48a intended to be received in a respective housing 50 formed for this purpose in an inner edge of the base 46 (figure 5).
- the actuator 2 is mounted placed on the upper part of the base 46, the lower face 2d of the peripheral edge of the base 2a being in abutment against the upper edge 46b of the base around the entire periphery of the latter to ensure the sealing at the interface of these two parts.
- the pins 23 of the connection element 42 are substantially planar and elongated parallel to the mounting axis A, starting from diametrically opposite points from the outer edge of the connection element towards the printed circuit 16.
- the planar faces of the pins 23 are substantially tangential with respect to the upper periphery of the connection element.
- pins 23 have a double function: - on the one hand to fix switch 1 as a whole on the printed circuit
- each spindle having a tongue 52 in the shape of a "U”, cut from the material of the spindle and bent inwards.
- the tongue 52 forms an elastic clip-on (or snap-in) means, the end of which is intended to be anchored against a portion of the lower surface of the printed circuit 16, near one of the holes 44; and
- connection element 42 to the base 46 and to maintain the actuator 2 between these two parts 44 and 46.
- the two pins 23 each have a pair of claws 23a. These start from the longitudinal edges respective opposites of a spindle and are turned inward to engage in respective corresponding housings 53 formed in opposite exterior faces of the base 46. During assembly of the switch, the actuator 2 is thus maintained sandwiched between the connecting element 42 and the base 46. When the four parts 42, 2, 4 and 46 of the switch 1 are assembled, they are therefore all coupled to form a unitary whole even before mounting on the printed circuit 16.
- the housing 50 of the base 46 has in cross section a lateral bearing 50a (parallel to the plane of the printed circuit) and a vertical bearing 50b.
- the lateral reach 50a constitutes for each hook 48a a stop for retaining the blister 4 which prevents the latter from disuniting from the base.
- the vertical reach 50b constitutes a stop for the elastic deflection of the blade 48 and is essentially used for positioning, or guiding, the blister.
- these two bearing surfaces 50a and 50b allow a floating mounting of the blister 4, with a clearance el in the direction of the mounting axis A.
- This floating mounting makes it possible to release the blister from its anchoring constituted by the lateral surface 50a when the switch is mounted on the printed circuit 16.
- each blade 48 at the corner of the blister 4 has a bend 4a whose external curvature is turned towards the printed circuit 16. Before mounting on the printed circuit 16, this bend constitutes the point of greatest protrusion of the underside of the switch 1 when the hook 48a is in abutment against the lateral bearing 50a (FIG. 6a).
- the elbows 4a When mounting the switch 1 on the printed circuit 16, the first physical contact with the latter is established by the elbows 4a. These elbows then retract towards the base, thanks to the clearance el, until the lower edge 46c of the base in turn abuts against the face of the printed circuit to adopt the final mounting position, at which the snap tabs 52 move apart to anchor themselves under the printed circuit. As shown in FIG. 6b, the elbows 4a and the lower edge 46c of the base are then both at the face of the printed circuit, and the hooks 48a are released from the lateral bearing 50a by a distance equal to the above-mentioned clearance el. At this mounting position, the blister 4 is released from the anchoring stop 50a of the base 46, as shown in FIG.
- this lower edge is produced in the form of a peripheral sealing lip 46c capable of deforming when it is pressed against the printed circuit 16.
- This lip 46c is made of elastomeric material or flexible plastic, like the rest of the base 46.
- the thickness of this lip 46c progressively decreases by beveled interior profiling of the interior face 46c of the base (FIGS. 6a and 6b), until it forms a fine contact area with the printed circuit, allowing a better fit. hermetically the surface of the latter.
- the sealing means 46c of the switch 1 are therefore integrated in one piece with the base 46, the latter being able to be produced easily in one piece by molding of flexible plastic or elastomer.
- the sealing of the interior of the switch 1, at the interface with the printed circuit, can be ensured by the actuator 2 rather than by the base.
- the base 2a of the actuator 2 can then be dimensioned to extend beyond the base 46 and completely envelop it, this base being provided with a sealing lip making contact with the printed circuit 16, at the like the lip 18 described with reference to FIGS. 1 to 3.
- the design of the switch 20 in the form of mechanically simple separate parts (housing 42, actuator 2, blistering 4 and base 46) also makes it possible to envisage manufacturing techniques and particularly fast and judicious packaging.
- the connecting element 42, the blister 4 and the base 46 can each be produced by stamping (or molding for the base) directly on a respective carrier strip.
- the parts are only detached from their carrier strip at the switch assembly site, which allows the carrier strip to be used for packaging the parts.
- the parts which can come from different sources of supply, will for example be packaged in their roll carrier strip for transport from the supplier to the assembly site.
- the carrier strips can be installed in a tape feeder assembly machine.
- Some of the parts, in particular the blister 4 can be covered with a protective film, for example a plastic film that can be peeled, to avoid dirt or scratches during handling.
- This packaging under carrier tape allows a more rational industrialization compared to the classic technique of separating parts at the source of their manufacture, then their transport in bulk to a site for feeding on vibrating tanks of a switch assembly line. , possibly with individual and batch packaging and unpacking before and after transport. However, this technique can obviously be used for the manufacture of this switch.
- one of its constituent parts for example the connecting element 42
- the connecting element 42 can remain at least partially secured to its strip.
- This arrangement makes it possible to use this strip to condition the entire assembled switch 1.
- the strip in question can then be transported, for example in the form of a roll, for installation in a tape-fed automaton used for mounting the switch on its printed circuit board.
- the strip can be separated into individual switches at the mounting site if another mounting technique is provided.
- a strip of interlayer material is inserted between each winding winding of the strip and / or a peelable film is placed on the blister. It should be noted that it is not necessarily necessary for one of the constituent parts of the switch to be held integral with its strip during manufacture for the aforementioned packaging, since the assembled switches can be held in any manner on one of the bands.
- the embodiment advantageously provides for an initial pre-folding of the pins 23 from their original position, which is in the plane of the annular part in the example.
- This pre-folding on an angle of the order of 45 °, brings the pins to a flared position with respect to the central axis A, in the direction of the spacing going towards the free end.
- This arrangement makes it possible to bring the base 46, whether or not provided with the metal dome 4, under this connecting piece 42 and to link the assembly by completing the folding at 90 °, that is to say by orienting the pins parallel to axis A, in order to bring the claws 23a into their respective housing 53 of the base 46.
- the dome 4 is in contact only with the base 46 (before mounting on the circuit) or on the plate 16 of the circuit (after mounting) makes it possible to provide for the actuator 2 in the form of a part of revolution (uniform all around its axis of revolution). This simplifies on the one hand its production and on the other hand the method of assembly. Indeed, no angular orientation of the actuator is to be expected during the transfer of the base on the assembly line, nor during its mounting on the other parts of the switch.
- the switch according to the invention is further remarkable in that it can be mounted on any type of electrical circuit board, such as a printed circuit board, a connection board, etc., and can perform a switching by direct contact on conductive tracks. Furthermore, several such switches can be mounted on the same plate, depending on the applications envisaged. It is therefore not necessary to provide a plate dedicated to a single switch, which is the case with conventional microswitches (known by the English term "micro switch").
- the switch 1 according to the present invention is unitary even before it is assembled and lends itself to standardization according to many different applications.
- the invention allows many variations, both in terms of the shape of the parts, their arrangement, the fixing means, relative dimensions, materials and manufacturing methods used and circuit supports.
- the invention finds application in many fields of industrial activity using blistering switches.
Landscapes
- Push-Button Switches (AREA)
- Manufacture Of Switches (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0212882A FR2846143B1 (fr) | 2002-10-16 | 2002-10-16 | Commutateur electrique a actionnement par pression de type cloquant et son procede de fabrication |
FR0212882 | 2002-10-16 | ||
PCT/FR2003/002856 WO2004036609A1 (fr) | 2002-10-16 | 2003-09-29 | Commutateur electrique a actionnement par pression de type cloquant et son procede de fabrication |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1552540A1 true EP1552540A1 (fr) | 2005-07-13 |
EP1552540B1 EP1552540B1 (fr) | 2014-04-02 |
Family
ID=32050447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03775454.6A Expired - Lifetime EP1552540B1 (fr) | 2002-10-16 | 2003-09-29 | Commutateur electrique a actionnement par pression de type cloquant et son procede de fabrication |
Country Status (6)
Country | Link |
---|---|
US (1) | US7151236B2 (fr) |
EP (1) | EP1552540B1 (fr) |
JP (1) | JP2006503409A (fr) |
AU (1) | AU2003283482A1 (fr) |
FR (1) | FR2846143B1 (fr) |
WO (1) | WO2004036609A1 (fr) |
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US6073341A (en) * | 1998-03-10 | 2000-06-13 | Odorfer; Richard A. | Dome switch assembly system |
FR2800904B1 (fr) * | 1999-11-10 | 2002-04-05 | Dav | Dispositif de commutation unitaire etanche |
FR2803084B1 (fr) * | 1999-12-27 | 2002-04-19 | Itt Mfg Entpr S Inc | Commutateur electrique a effet tactile fixe par emboitement elastique sur une plaque a circuits |
JP2001297649A (ja) * | 2000-04-13 | 2001-10-26 | Matsushita Electric Ind Co Ltd | 可動接点体連の製造方法、およびそれを用いて製造された可動接点体連および可動接点体 |
JP2003151393A (ja) * | 2001-11-15 | 2003-05-23 | Matsushita Electric Ind Co Ltd | 可動接点体およびそれを用いたパネルスイッチ、並びにそのパネルスイッチを装着した電子機器 |
-
2002
- 2002-10-16 FR FR0212882A patent/FR2846143B1/fr not_active Expired - Lifetime
-
2003
- 2003-09-29 AU AU2003283482A patent/AU2003283482A1/en not_active Abandoned
- 2003-09-29 US US10/531,216 patent/US7151236B2/en not_active Expired - Fee Related
- 2003-09-29 EP EP03775454.6A patent/EP1552540B1/fr not_active Expired - Lifetime
- 2003-09-29 WO PCT/FR2003/002856 patent/WO2004036609A1/fr active Application Filing
- 2003-09-29 JP JP2004544359A patent/JP2006503409A/ja active Pending
Non-Patent Citations (1)
Title |
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See references of WO2004036609A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10752250B2 (en) | 2015-12-21 | 2020-08-25 | Psa Automobiles Sa | Method and device for assisting with change of speed and with change of lane |
Also Published As
Publication number | Publication date |
---|---|
FR2846143A1 (fr) | 2004-04-23 |
US20050259382A1 (en) | 2005-11-24 |
US7151236B2 (en) | 2006-12-19 |
AU2003283482A1 (en) | 2004-05-04 |
JP2006503409A (ja) | 2006-01-26 |
FR2846143B1 (fr) | 2005-01-07 |
EP1552540B1 (fr) | 2014-04-02 |
WO2004036609A1 (fr) | 2004-04-29 |
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