FR2729042A1 - Flexible printed circuit board for motor vehicle engine control - Google Patents

Flexible printed circuit board for motor vehicle engine control Download PDF

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Publication number
FR2729042A1
FR2729042A1 FR9415785A FR9415785A FR2729042A1 FR 2729042 A1 FR2729042 A1 FR 2729042A1 FR 9415785 A FR9415785 A FR 9415785A FR 9415785 A FR9415785 A FR 9415785A FR 2729042 A1 FR2729042 A1 FR 2729042A1
Authority
FR
France
Prior art keywords
card
anchoring
printed circuit
circuit board
wings
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
FR9415785A
Other languages
French (fr)
Other versions
FR2729042B1 (en
Inventor
Jean Hoche
Alain Dreyfus
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.)
Sagem SA
Original Assignee
Sagem SA
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 Sagem SA filed Critical Sagem SA
Priority to FR9415785A priority Critical patent/FR2729042A1/en
Publication of FR2729042A1 publication Critical patent/FR2729042A1/en
Application granted granted Critical
Publication of FR2729042B1 publication Critical patent/FR2729042B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/14—Mounting supporting structure in casing or on frame or rack
    • H05K7/1417—Mounting supporting structure in casing or on frame or rack having securing means for mounting boards, plates or wiring boards
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/007—Manufacture or processing of a substrate for a printed circuit board supported by a temporary or sacrificial carrier
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/03—Use of materials for the substrate
    • H05K1/0393—Flexible materials
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09009—Substrate related
    • H05K2201/09063—Holes or slots in insulating substrate not used for electrical connections
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09009—Substrate related
    • H05K2201/09081—Tongue or tail integrated in planar structure, e.g. obtained by cutting from the planar structure
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09009—Substrate related
    • H05K2201/091—Locally and permanently deformed areas including dielectric material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/01—Tools for processing; Objects used during processing
    • H05K2203/0147—Carriers and holders
    • H05K2203/0156—Temporary polymeric carrier or foil, e.g. for processing or transferring
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/16—Inspection; Monitoring; Aligning
    • H05K2203/167—Using mechanical means for positioning, alignment or registration, e.g. using rod-in-hole alignment

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)

Abstract

The printed circuit board includes the cut-out oval shaped section, with the central section (9) remaining solid with the board, and two ends (1,2) free to flex. A rigid base (20) has a central hole with two protruding ridges (23,24). The two flexing ends are clipped under the ridges to hold the printed circuit board in place.

Description

Carte flexible.Flexible card.

L'origine de l'invention est le problème posé par les circuits imprimés de calculateur de contrôle de moteur de véhicules automobiles. Ces circuits imprimés supportent des transistors et autres composants de puissance dont il faut évacuer les calories. A cet effet, on favorise la dissipation thermique orthogonalement aux circuits imprimés en limitant au mieux leur épaisseur au point qu'il s'agit alors de circuits souples ou flexibles.The origin of the invention is the problem posed by printed circuit boards for motor vehicle engine control computers. These printed circuits support transistors and other power components whose calories must be removed. To this end, heat dissipation is favored orthogonally to the printed circuits by best limiting their thickness to the point that they are then flexible or flexible circuits.

Le montage des composants sur ces circuits souples s'effectue en y a) déposant une couche de pâte à braser par sérigraphie, en y b) posant de façon automatique les composants, et en les c) entrainant dans un four de refusion.The assembly of the components on these flexible circuits is carried out by a) depositing a layer of solder paste by screen printing, by b) automatically placing the components therein, and by c) entraining them in a reflow oven.

Lors de chacune des trois étapes du montage, les circuits imprimés doivent naturellement rester parfaitement plans, pour que, respectivement, I'épaisseur de pâte à braser soit uniforme, que les composants soient correctement déposés et que les circuits ne se déforment pas par effet de bilame.During each of the three stages of assembly, the printed circuits must naturally remain perfectly flat, so that, respectively, the thickness of solder paste is uniform, that the components are correctly deposited and that the circuits do not deform by effect of bimetallic strip.

Dans ce souci du maintien au moins provisoire de la planéité des circuits imprimés, on a proposé de les rigidifier, donc au moins provisoirement, en les solidarisant, tout autant au moins provisoirement, à un support rigide. Comme solutions, on a essayé le collage, mais qui oblige ensuite à un décollage, le vissage ou l'agraphage, mais la sérigraphie exclut toute saillie hors du plan de dépôt, la boîte de dépression, mais qui implique des moyens trop lourds.In order to maintain at least temporary flatness of the printed circuits, it has been proposed to stiffen them, therefore at least temporarily, by securing them, just as much at least temporarily, to a rigid support. As solutions, we tried gluing, but which then requires taking off, screwing or stapling, but the screen printing excludes any protrusion outside the deposition plan, the vacuum box, but which involves too heavy means.

Bref, la demanderesse s'est donc posé le problème du maintien au moins provisoire de la planéité d'une carte souple de circuit imprimé et plus généralement encore, d'une carte souple destinée à recevoir des composants électriques. II peut d'ailleurs parfaitement s'agir d'une carte qui sera déformée lors de son montage pour raccorder différentes cartes électroniques disposées dans des plans différents, en remplacement de fils, cables, circuits flex < igides et autres moyens nécessitant des connecteurs encombrants et onéreux. In short, the applicant therefore posed the problem of maintaining at least temporarily the flatness of a flexible printed circuit card and more generally still, of a flexible card intended to receive electrical components. It can moreover perfectly be a card which will be deformed during its assembly to connect different electronic cards arranged in different planes, replacing wires, cables, flex circuits and other means requiring bulky connectors and expensive.

C'est ainsi que l'invention de la présente demande conceme une carte flexible destinée à recevoir des composants électriques, caractérisée par le fait qu'elle comporte des moyens déformables agencés pour venir en saillie d'un seul côté de la carte et l'ancrer au moins provisoirement dans des orifices d'ancrage de moyens de rigidification.Thus, the invention of the present application relates to a flexible card intended to receive electrical components, characterized in that it comprises deformable means arranged to protrude from one side of the card and the anchor at least temporarily in anchoring holes for stiffening means.

De préférence, les moyens déformables d'ancrage de la carte s'étendent dans son épaisseur.Preferably, the deformable means for anchoring the card extend in its thickness.

Avantageusement, les moyens déformables d'ancrage sont issus de poinçonnage.Advantageously, the deformable anchoring means come from punching.

Dans ce demier cas, on peut donc réaliser les moyens déformables d'ancrage de la carte en même temps que ses trous et son détourage, c'est-à-dire donc pratiquement gratuitement.In the latter case, it is therefore possible to produce the deformable means for anchoring the card at the same time as its holes and its clipping, that is to say therefore practically free of charge.

Dans la forme de réalisation préférée de la carte de l'invention, les moyens déformables d'ancrage comprennent des ailes d'ancrage agencées pour, après flexion, venir en prise contre les bords d'ouvertures correspondantes ménagées dans les moyens de rigidification.In the preferred embodiment of the card of the invention, the deformable anchoring means comprise anchoring wings arranged to, after bending, engage against the edges of corresponding openings formed in the stiffening means.

Si les moyens de rigidification constituent un outillage support rigide provisoire, la sortie d'ancrage de la carte est particulièrement simple, par simple et faible traction entre les deux pièces
Mais les moyens de rigidification peuvent aussi constituer un support définitif, tel un fond de bottier par exemple.If the stiffening means constitute a temporary rigid support tool, the anchoring outlet of the card is particularly simple, by simple and weak traction between the two parts
But the stiffening means can also constitute a definitive support, such as a bottom of a shoemaker for example.

L'invention sera mieux comprise à l'aide de la description suivante de la forme de réalisation préférée de la carte de l'invention, en référence au dessin annexé, sur lequel: - la figure 1 représente schématiquement la carte flexible de l'invention; - la figure 2 représente une plaque support de rigidification de la carte; et - la figure 3 est une vue partielle en coupe selon la ligne 111-111 des figures 1 et 2, illustrant l'ancrage de la carte au support.The invention will be better understood using the following description of the preferred embodiment of the card of the invention, with reference to the attached drawing, in which: - Figure 1 schematically shows the flexible card of the invention ; - Figure 2 shows a support plate for stiffening the card; and - Figure 3 is a partial sectional view along line 111-111 of Figures 1 and 2, illustrating the anchoring of the card to the support.

L'exemple de réalisation qui va être décrit correspond au problème indiqué cidessus que posent les circuits imprimés flexibles de contrôle moteur, lors du montage des composants.The embodiment which will be described corresponds to the problem indicated above posed by the flexible printed motor control circuits, during the assembly of the components.

La carte de la figure 1 est, par souci de clarté, représentée nue et ne comportant que deux paires espacées d'ailes d'ancrage 1-2 et 34, représentées à écheile dilatée, qui sont déformables pour venir en saillie d'un seul coté de la carte et l'ancrer, provisoirement ici, dans des orifices d'ancrage respectifs 21-22 de la plaque de rigidification 20.The card of Figure 1 is, for the sake of clarity, shown naked and comprising only two spaced pairs of anchor wings 1-2 and 34, shown with enlarged scale, which are deformable to project from a single side of the card and anchor it, provisionally here, in respective anchoring holes 21-22 of the stiffening plate 20.

Les ailes d'ancrage 14 s'étendent, au repos, dans l'épaisseur de la carte et ont été obtenues par un poinçonnage, lors de la fabrication de la carte nue, créant quatre fentes 54 sensiblement en forme de U, qui délimitent respectivement les quatre ailes 14.The anchoring wings 14 extend, at rest, in the thickness of the card and were obtained by punching, during the manufacture of the bare card, creating four slots 54 substantially U-shaped, which respectively delimit the four wings 14.

Comme le montre la figure 1, les ailes d'ancrage sont ici groupées par paires 12 et 34 et s'étendent à l'opposé l'une de l'autre dans chaque paire. Les emplantures des deux ailes 1-2 et 34 de chaque paire sont solidaires de zones respectivement 9 et 10 les reliant au reste de la carte.As shown in Figure 1, the anchor wings are here grouped in pairs 12 and 34 and extend opposite each other in each pair. The bases of the two wings 1-2 and 34 of each pair are integral with zones 9 and 10 respectively connecting them to the rest of the card.

Les orifices d'ancrages 21-22 sont ici des ajutages débouchants, disposés et dimensionnés pour recevoir respectivement les ailes 1-2 et 34. Dans la direction d'extension des ailes 1-2 et 34, c'est-à-dire horizontalement sur les figures, chaque orifice 21-22 présente, à son embouchure côté carte, un étranglement de dimension légèrement inférieure à la distance séparant les bords des deux extrémités libres des paires d'ailes 1-2 et 34.The anchoring holes 21-22 are here through nozzles, arranged and dimensioned to receive the wings 1-2 and 34 respectively. In the direction of extension of the wings 1-2 and 34, that is to say horizontally in the figures, each orifice 21-22 has, at its mouth on the card side, a constriction of dimension slightly less than the distance separating the edges of the two free ends of the pairs of wings 1-2 and 34.

L'embouchure, ou étranglement, de l'orifice 21 est donc incluse, avec une marge, entre les deux lignes 11-12 en trait mixte qui sont tangentes aux bords des extrémités libres des ailes 1-2 et séparées de la distance correspondante.The mouth, or constriction, of the orifice 21 is therefore included, with a margin, between the two lines 11-12 in phantom which are tangent to the edges of the free ends of the wings 1-2 and separated by the corresponding distance.

La forme étranglée de l'orifice 21-22, et donc l'épanouissement qui suit l'étranglement, est obtenue ici par un premier perçage d'un orifice à paroi cylindrique suivi d'un fraisage créant deux lamages 23-24 et 2S26 opposés dans le bord de chaque orifice 21-22.The constricted shape of the orifice 21-22, and therefore the blooming which follows the constriction, is obtained here by a first drilling of an orifice with a cylindrical wall followed by a milling creating two counterbores 23-24 and 2S26 opposite in the edge of each hole 21-22.

Comme on l'aura compris au vu de la figure 3,1'ancrage de la carte est effectué en faisant fléchir les ailes 14 vers la plaque 20 et en les faisant venir en prise contre les bords des orifices 21-22, plus précisément au niveau des lamages 23-26. Les orifices 21-22 de la plaque 20 assurent l'ancrage de la carte en diverses zones espacées, ici deux, ce qui limite les déformations possibles de la carte et ainsi la rigidifie. En outre, le reste de la plaque 20 assure un appui à la carte et ainsi contribue à sa rigidification.As will be understood from FIG. 3, the card is anchored by bending the wings 14 towards the plate 20 and making them engage against the edges of the orifices 21-22, more precisely at counterbore level 23-26. The orifices 21-22 of the plate 20 anchor the card in various spaced zones, here two, which limits the possible deformations of the card and thus stiffens it. In addition, the rest of the plate 20 provides support for the card and thus contributes to its stiffening.

Les ailes 14 présentent, dans cet exemple, une élasticité qui empêche leur libération tant que la force d'arrachement de la carte de la plaque support 20 n'a pas dépassé un seuil, fonction de cette élasticité et de la taille de l'étranglement.The wings 14 have, in this example, an elasticity which prevents their release as long as the tearing force of the card from the support plate 20 has not exceeded a threshold, a function of this elasticity and of the size of the constriction .

La plaque de rigidification 20 constitue ici un outillage support rigide provisoire mais, dans d'autres applications, on peut utiliser un support de rigidification définitif. Dans un cas comme dans l'autre, le support de rigidification peut avoir toute forme voulue, le nombre d'ailes d'ancrage et leur disposition étant déterminés en conséquence. En cas d'absence d'élasticité suffisante des ailes, le support de rigidification peut comporter des moyens d'ancrage retenant prisonniéres les ailes, par exemple par pincement ou accrochage.The stiffening plate 20 here constitutes a temporary rigid support tool but, in other applications, it is possible to use a definitive stiffening support. In either case, the stiffening support can have any desired shape, the number of anchoring wings and their arrangement being determined accordingly. In the absence of sufficient elasticity of the wings, the stiffening support may include anchoring means capturing the wings, for example by pinching or hooking.

La disposition par paires d'ailes opposées de cet exemple ne présente pas un caractère obligatoire. En effet, des ailes séparées réparties sur la carte peuvent, simplement par contact avec friction sur le lamage, empêcher un glissement libérateur de la carte sur la plaque 20. Des ailes isolées s'étendant dans des directions différentes peuvent aussi, même en l'absence de friction, empêcher tout glissement de la carte sur la plaque 20. The arrangement in pairs of opposite wings of this example is not compulsory. Indeed, separate wings distributed on the card can, simply by friction contact on the counterbore, prevent a liberating sliding of the card on the plate 20. Isolated wings extending in different directions can also, even in the absence of friction, prevent any sliding of the card on the plate 20.

Claims (6)

REVENDICATIONS 1. Carte flexible destinée à recevoir des composants électriques, caractérisée par le fait qu'elle comporte des moyens déformables (14) agencés pour venir en saillie d'un seul côté de la carte et l'ancrer au moins provisoirement dans des orifices d'ancrage (21-22) de moyens de rigidification (20).1. Flexible card intended to receive electrical components, characterized in that it comprises deformable means (14) arranged to protrude on one side of the card and anchor it at least temporarily in orifices of anchoring (21-22) of stiffening means (20). 2. Carte selon la revendication 1, dans laquelle les moyens déformables (14) d'ancrage de la carte s'étendent dans son épaisseur.2. Card according to claim 1, wherein the deformable means (14) for anchoring the card extend in its thickness. 3. Carte selon l'une des revendications 1 et 2, dans laquelle les moyens déformables d'ancrage (14) sont issus de poinçonnage.3. Card according to one of claims 1 and 2, wherein the deformable anchoring means (14) are from punching. 4. Carte selon l'une des revendications 1 à 3, dans laquelle les moyens déformables d'ancrage comprennent des ailes d'ancrage (1-4) agencées pour, après flexion, venir en prise contre les bords (23-26) d'ouvertures correspondantes ménagées dans les moyens de rigidification (20).4. Card according to one of claims 1 to 3, wherein the deformable anchoring means comprise anchoring wings (1-4) arranged to, after bending, engage against the edges (23-26) d 'corresponding openings in the stiffening means (20). 5. Carte selon l'une des revendications 1 9 4, dans laquelle les moyens de rigidification (20) constituent un outillage support rigide provisoire.5. Card according to one of claims 1 9 4, wherein the stiffening means (20) constitute a temporary rigid support tool. 6. Carte selon l'une des revendications 1 à 4, dans laquelle les moyens de rigidification constituent un support définitif. 6. Card according to one of claims 1 to 4, wherein the stiffening means constitute a final support.
FR9415785A 1994-12-28 1994-12-28 Flexible printed circuit board for motor vehicle engine control Granted FR2729042A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9415785A FR2729042A1 (en) 1994-12-28 1994-12-28 Flexible printed circuit board for motor vehicle engine control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9415785A FR2729042A1 (en) 1994-12-28 1994-12-28 Flexible printed circuit board for motor vehicle engine control

Publications (2)

Publication Number Publication Date
FR2729042A1 true FR2729042A1 (en) 1996-07-05
FR2729042B1 FR2729042B1 (en) 1997-02-21

Family

ID=9470344

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9415785A Granted FR2729042A1 (en) 1994-12-28 1994-12-28 Flexible printed circuit board for motor vehicle engine control

Country Status (1)

Country Link
FR (1) FR2729042A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999016292A1 (en) * 1997-09-25 1999-04-01 Minnesota Mining And Manufacturing Company Article and method for temporarily securing a flexible circuit to a rigid member
AT15258U1 (en) * 2015-11-19 2017-04-15 Tridonic Gmbh & Co Kg Printed circuit board for mechanically fixing a housing

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01212488A (en) * 1988-02-19 1989-08-25 Canon Inc Structure for fixing flexible substrate
JPH0329395A (en) * 1989-06-26 1991-02-07 Fuji Photo Film Co Ltd Mounting structure of flexible printed circuit board
JPH0582919A (en) * 1991-09-20 1993-04-02 Canon Inc Flexible printed wiring board

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01212488A (en) * 1988-02-19 1989-08-25 Canon Inc Structure for fixing flexible substrate
JPH0329395A (en) * 1989-06-26 1991-02-07 Fuji Photo Film Co Ltd Mounting structure of flexible printed circuit board
JPH0582919A (en) * 1991-09-20 1993-04-02 Canon Inc Flexible printed wiring board

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 522 (E - 849) 21 November 1989 (1989-11-21) *
PATENT ABSTRACTS OF JAPAN vol. 15, no. 157 (E - 1058) 19 April 1991 (1991-04-19) *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 418 (E - 1408) 4 August 1993 (1993-08-04) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999016292A1 (en) * 1997-09-25 1999-04-01 Minnesota Mining And Manufacturing Company Article and method for temporarily securing a flexible circuit to a rigid member
AT15258U1 (en) * 2015-11-19 2017-04-15 Tridonic Gmbh & Co Kg Printed circuit board for mechanically fixing a housing
US11006540B2 (en) 2015-11-19 2021-05-11 Tridonic Gmbh & Co Kg Circuit board for mechanically fastening a housing

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