EP3178134A1 - Connecteur pour la connexion en matrice entre un boîtier et un support, comportant un corps principal plié - Google Patents
Connecteur pour la connexion en matrice entre un boîtier et un support, comportant un corps principal pliéInfo
- Publication number
- EP3178134A1 EP3178134A1 EP15744953.9A EP15744953A EP3178134A1 EP 3178134 A1 EP3178134 A1 EP 3178134A1 EP 15744953 A EP15744953 A EP 15744953A EP 3178134 A1 EP3178134 A1 EP 3178134A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- connector
- main body
- housing
- folding
- connectors
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
- H01R12/50—Fixed connections
- H01R12/51—Fixed connections for rigid printed circuits or like structures
- H01R12/52—Fixed connections for rigid printed circuits or like structures connecting to other rigid printed circuits or like structures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
- H01R13/22—Contacts for co-operating by abutting
- H01R13/24—Contacts for co-operating by abutting resilient; resiliently-mounted
- H01R13/2435—Contacts for co-operating by abutting resilient; resiliently-mounted with opposite contact points, e.g. C beam
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/16—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
Definitions
- the present invention relates to the general field of connectivity, particularly for microelectronics, and more specifically to the field of mechanical and electrical connection means between a particular microelectronic package, which may be of relatively large size, and a particularly microelectronic support, which can be for example a printed circuit (also called PCB for "Printed Circuit Board” in English).
- a printed circuit also called PCB for "Printed Circuit Board” in English.
- the invention is concerned with such connection means provided to collect mechanical deformations without degradation of their functions.
- the invention finds for example preferred applications in the fields of computing, telephony, avionics, space electronics and automotive electronics, so-called embedded electronics, and for the majority nomadic electronic objects, among others.
- the matrix connection corresponds to a network of connections, in particular between pads substantially facing or superimposed.
- interposers which allow the assembly of several electronic components side by side
- integrated circuit packages which form a mechanical interface between one or more electronic components and the printed circuit
- compounds of plastic or preferably ceramic are increasingly used to allow the integration of several chips including microelectronics presenting, for example, different technologies, designs or suppliers.
- microelectronic package designates any microelectronic device to be carried on a microelectronic support, in particular a printed circuit.
- a microelectronic device may be an integrated circuit package, in particular a ceramic package, an interposer, for example a silicon interposer, or even a microelectronic chip, in particular of large size, among others.
- connection through the periphery of the housing becomes difficult, if not impossible, and it is generally preferred a connection by a matrix (possibly incomplete), that is to say a table or a grid, connectors placed on the most of one of the faces of the case.
- a matrix possibly incomplete
- These connectors must fulfill multiple functions by connecting the housing and the microelectronic support.
- mechanical functions maintaining the housing in connection with the microelectronic support, resisting differential expansion between these two elements, and supporting shocks and vibrations.
- the mechanical stresses amplitude of the thermal cycles, intensity of the shocks, frequency and acceleration of the vibrations
- thermal functions ensuring the evacuation towards the microelectronic support of all or part of the heat produced by the component (s), by example microelectronic chips, present on the housing.
- the thermal stresses also depend on the application and can at least partly be expressed by the thermal resistance (or thermal conductance) of each connector.
- the connectors also have functions of catching flatness defects of the housing and the microelectronic support, and non-coplanarity defects between the housing and the microelectronic support.
- flip chip also called “flip chip”
- This technique consists in providing, on the housing, a matrix (possibly incomplete) of generally circular electrical contacts (pellets), this matrix being called a matrix of pellets (or LGA for "Land Grid Array” in English) for ceramic housings .
- pellets typically of a diameter of between 100 and 800 ⁇ , are positioned balls of a relatively low melting point metal, for example chosen from eutectics or solders based on lead, tin, iron or copper, silver, indium, bismuth or other elements.
- Corresponding contacts are also provided next to the microelectronic support.
- the housing is then returned to the microelectronic support, and the assembly is brought to the melting temperature of the metal balls, then is lowered to temperature.
- These balls provide the electrical, mechanical and thermal connection between the housing and the microelectronic support.
- water-soluble preforms comprising balls with diameters and not desired, such as than those produced by Winslow Automation, Inc.
- each metal column an internal or external structure (generally a spiral) of another more elastic metal, for example copper or copper-beryllium, intended on the one hand to maintain the electrical contact even if the mechanical function fails due to a strong plastic deformation of the column, and secondly to mechanically strengthen the column.
- another more elastic metal for example copper or copper-beryllium
- US Pat. No. 6,215,670 B1 proposes wire interconnections comprising at least one change of direction and being composed of at least two materials, one internally and the other externally. These are carried out on an assembly substrate or a semiconductor chip, one by one by thermocompression of gold wire, and then surface treatment.
- US patent application US 2013/0344718 A1 proposes a substrate having folded and soldered connections on the substrate, the bending ensuring elasticity only in the vertical axis.
- the substrate is not attached to the housing by the connections, but serves as an interposer between an electronic board and a housing.
- the connection is of the fixed / free type, and not fixed / fixed or recessed / recessed as in the invention.
- the invention thus aims to at least partially remedy the needs mentioned above and the disadvantages relating to the achievements of the prior art.
- the invention thus has, according to one of its aspects, an electrical connector, intended to allow a connection between two electrical pads substantially facing respectively a housing and a support, characterized in that it comprises a main body provided with a first end for its fixed connection with the housing and a second end for its fixed connection with the support, the main body being folded at at least one folding zone, or even at the level of at least two folding zones, or even at the level of at least three folding zones, or even at the level of at least four or even five folding zones.
- the connector according to the invention can be used to connect, on the particular microelectronic support, a large housing.
- the principle of the connector according to the invention it may be possible to obtain both the desired stiffness, even relatively low, the connector in the direction of the plane of the support or the housing and a relatively large displacement, by example of a hundred microns or more, between the top and bottom of the connector in the direction of the plane of the support or the housing. It may also be possible to size the connector to independently adjust the stiffness in normal and parallel directions to the housing and support.
- the connector according to the invention may further comprise one or more of the following characteristics taken separately or in any possible technical combinations.
- the support is preferably constituted by a printed circuit.
- the housing can in turn be particularly a ceramic housing or a silicon interposer, especially large.
- Said at least one folding zone may more specifically comprise at least one direction or fold line.
- the main body of the connector may comprise a wire, a ribbon or a plate, for example a metal sheet, in particular of metal material.
- the main body of the connector can be elastic.
- the main body can be folded in at least one or even two folding directions.
- said at least two folding directions can induce at least two arcuate or circular portions together defining a corrugated shape.
- the wire may preferentially have a circular shape in section.
- other forms are possible.
- the main body may be a folded wire in two fold directions, defining in particular a shape similar to the letter "S".
- the main body may be a wire folded in three folding directions, defining in particular a shape similar to the letter " ⁇ ".
- Each of the first and second ends of the main body may have a circular connecting surface, respectively for connection to the housing and the support.
- each of the first and second ends of the main body may comprise a conical or enlarged tip.
- Each of the first and second ends of the main body may in particular have a circular or enlarged connection surface relative to the main body, ie larger than the section of the main body, respectively for connection to the housing and the support.
- the main body may be a ribbon, folded in at least one or even two fold directions.
- the ribbon may have, before folding, a substantially rectangular shape.
- Each of the first and second ends of the main body may have a rectangular or square connection surface.
- the main body may be a ribbon folded in a first folding direction at the first end and in a second folding direction at the second end, the first and second folding directions being orthogonal.
- the central portion of the main body may further be advantageously twisted, in particular at an angle of the order of 90 °, or the central portion of the main body can be folded in a direction at 45 ° of the first and second fold directions.
- the main body may be a folded tape at first and second fold directions at the first end, and at third and fourth fold directions at the second end, the first and second fold directions being parallel to each other and orthogonal to the third and fourth fold directions, the third and fourth fold directions being parallel to each other.
- the central part of the main body can moreover advantageously be twisted in particular at an angle of the order of 90 ° or the central part of the main body can be folded in a direction at 45 ° of the first, second, third and fourth folding directions .
- the main body may be a plate, in particular a metal sheet, folded in at least one or even two folding directions.
- the main body may then comprise cutouts formed between tongues connecting upper and lower parts, respectively comprising the first and second ends.
- Each of the first and second ends of the main body may have a connecting surface whose shape is similar to the letter "U".
- the invention also relates, according to another of its aspects, to a device, in particular a microelectronic device, characterized in that it comprises a plurality of connectors as defined above, arranged on a surface of the device according to a matrix or network, the device corresponding to one of the elements selected between the housing and the support, and the connectors for connection matrix or network of said element with the other of the elements selected between the housing and the support.
- the device can correspond to the housing or the support.
- the plurality of connectors may comprise a general direction orthogonal to the device, the different connectors being arranged in this direction with different orientations, in particular at 90 °, and advantageously alternating.
- the electrical connectors may be arranged in rows of connectors substantially parallel to each other, the orientations of the connectors of each row being alternately two by two.
- the arrangement of the electrical connectors according to the same general direction orthogonal to the device, with different orientations makes it possible to manage the stresses (or deformations) applied to the device.
- the different orientations of these connectors can be applied between adjacent connectors so as to create a generally isotropic constraint in the device: the rigidity along the x-axis of a first connector is equal to the stiffness along the y-axis d a second connector, adjacent to the first connector and oriented at 90 °, and the rigidity along the y axis of the first connector is equal to the rigidity along the x-axis of the second connector.
- the overall stiffness of these two connectors is identical along the x and y axes, making it possible to obtain a generally isotropic behavior of the device.
- the device may comprise an element forming a matrix base in which a plurality of cavities is formed according to the desired shape of the matrix or network of the connectors, the cavities receiving the connectors for their attachment in particular by brazing on the device.
- the element forming a matrix base may in particular comprise a soluble material.
- the element forming a matrix base may be removable, and in particular intended to be removed after fixation, in particular by brazing the connectors on the housing and / or the support.
- the cavities of the element forming a matrix base can be formed with different orientations in at least two different directions, in particular alternately, for example in two perpendicular directions of the plane of the housing.
- the invention also relates, in another of its aspects, to a method of manufacturing a connector as defined above, in which, from a conductive material conditioned in the form of a sheet or coil, performs formatting operations by folding, cutting and surface treatment for attachment including soldering, to obtain the connector.
- the method may be implemented for the manufacture of a connector according to the first and second variants presented above, and may comprise the steps, successive or not, consisting of:
- this surface treatment having in particular the purpose of passivating the connector and making it compatible for brazing.
- the method may also be implemented for the manufacture of a connector according to the third variant presented above, and may comprise the steps of:
- the connector, the device and the manufacturing method according to the invention may comprise any of the features set forth in the present description, taken individually or in any technically possible combination with other characteristics.
- FIG. 1A, 1B and 1C show, respectively in side view, in perspective and in top view or below, a first embodiment of a connector according to the invention
- FIGS. 2A and 2B show, respectively in side view and in perspective, a second embodiment of a connector according to the invention
- FIGS. 3A and 3B show, respectively in side view and in perspective, a third embodiment of a connector according to the invention
- FIGS. 4A, 4B and 4C show, respectively in side view, in perspective and in top view or below, a fourth embodiment of a connector according to the invention
- FIGS. 5A, 5B and 5C show, respectively in perspective, in side view and in top view or below, a fifth embodiment of a connector according to the invention
- FIGS. 6A, 6B and 6C show, respectively in perspective, in side view and in top view or below, a sixth exemplary embodiment of a connector according to the invention
- FIGS. 7A, 7B and 7C show, respectively in perspective, in side view and in top view or below, a seventh embodiment of a connector according to the invention
- FIGS. 8A, 8B and 8C show, respectively in side view, in plan view or in perspective view, an eighth embodiment of a connector according to the invention
- FIGS. 9A and 9B show respectively, in top view, two examples of elements forming a matrix base for a microelectronic device comprising a plurality of connectors according to the invention arranged in a matrix,
- FIG. 10 illustrates four steps of a method of manufacturing a connector according to the invention
- FIGS. 11A and 11B illustrate two other steps of a method of manufacturing a connector according to the invention.
- FIG. 11C shows, in perspective, a connector according to the invention obtained by the manufacturing method of Figures 11A and 11B.
- connectors 1 are shown. Such connectors 1 are in particular intended to allow a matrix connection between a microelectronic package and a microelectronic medium, and in particular a printed circuit.
- the connectors 1 may be in the form of folded metal wires.
- the connectors 1 may be in the form of folded metal strips.
- each connector 1 may be in the form of a plate, and in particular of a metal sheet, folded.
- each connector 1 comprises a main body 2 provided with a first end 3a for its connection with the microelectronic package and a second end 3b for its connection with the microelectronic support.
- the main body 2 is folded at at least two folding zones Z1-Z5, which comprise in particular at least two folding directions D1-D5.
- FIGS. 1A to 1C there is shown, respectively in side view, in perspective and in top view or below, a first embodiment of a connector 1 according to the invention.
- the main body 2 is a wire folded in three folding directions D1, D2 and D3 so as to define a shape similar to the letter " ⁇ ". It comprises three circular portions 4a, 4b and 4c, at least two of which together define a wavy shape.
- the main body 2 comprises a first rectilinear portion 9a optional, a first circular portion 4a, a second rectilinear portion 9b optional, a second circular portion 4b, a third rectilinear portion 9c optional, a third circular portion 4c and a fourth portion rectilinear 9d optional.
- connection with the housing and the printed circuit is respectively carried out through the first 3a and second 3b ends.
- the main body 2 preferably has a circular section in section.
- a circular shape has several advantages, and in particular ease of production and low cost; an ease of calculation of the stiffness of the connector 1, either by approximate analytical formulas known to those skilled in the art, or by calculations of the finite element type; an ease of optimizing the dimensions (radius of the wire, radius of curvature of the circular portions 4a-4c, presence and length of the rectilinear portions 9a-9d, among others) to obtain the desired stiffnesses, both in the directions parallel to the plane of the housing and circuit printed only in the direction perpendicular to this plane, and to obtain the electrical and thermal resistances, as well as the desired electrical impedances and capacitances.
- FIGS. 2A and 2B there is shown respectively in side view and in perspective, a second embodiment of a connector 1 according to the invention.
- the main body 2 is a folded wire in two fold directions D1 and D2. It comprises four circular portions 4a, 4b, 4c and 4d, at least two of which together define a wavy shape.
- the main body 2 is folded in the two folding directions D1 and D2 so as to define a shape similar to the letter "S".
- the main body 2 comprises a first rectilinear portion 9a optional, a first circular portion 4a, a second rectilinear portion 9b optional, a second circular portion 4b, a third circular portion 4c, a third optional rectilinear portion 9c, a fourth portion circular 4d, and a fourth optional rectilinear portion 9d.
- FIGS. 3A and 3B there is shown, respectively in side view and in perspective, a third embodiment of a connector 1 according to the invention.
- the main body 2 is a wire folded in three folding directions D1, D2 and D3 so as to define a shape similar to the letter " ⁇ " with vertical ends. It comprises four circular portions 4a, 4b, 4c and 4d, at least two of which together define a wavy shape.
- the main body 2 comprises a first rectilinear portion 9a optional, a first circular portion 4a, a second circular portion 4b, a second rectilinear portion 9b optional, a third circular portion 4c, a fourth circular portion 4d, and a third portion optional rectilinear 9c.
- a fourth embodiment of a connector 1 according to the invention.
- the main body 2 is a wire folded in three folding directions D1, D2 and D3 in a manner similar to the first example described above with reference to FIGS. 1A to 1C.
- the connector 1 comprises at each of the first 3a and second 3b ends of the main body 2 an approximately conical tip 5a and 5b having a circular connection surface S.
- the presence of such conical ends 5a and 5b can make it possible to increase the periphery of the connection surface S between the connector 1 and the housing, and between the connector 1 and the printed circuit, and thus to increase the mechanical reliability.
- Such conical tips 5a and 5b may in particular be made by bar turning, punching or plastic local deformation of a wire.
- a conical shape has several advantages, and in particular the increase in the attachment surface making the connection more reliable, and a moderate cost; an ease of calculation of the stiffness of the connector 1, either by approximate analytical formulas known to those skilled in the art, or by calculations of the finite element type; an ease of optimizing the dimensions (radius of the wire, radius of curvature of the circular portions 4a-4c, presence and length of the rectilinear portions 9a, 9b, among others) to obtain the desired stiffnesses, both in the directions parallel to the plane of the and the printed circuit board only in the direction perpendicular to this plane, and to obtain the electrical and thermal resistors, as well as the desired electrical impedances and capacitances below a threshold depending on the application.
- each of the first 3a and second 3b ends of the main body 2 of the connector 1 has a circular connection surface S, respectively for the connection to the microelectronic package and the microelectronic support.
- a fifth embodiment of a connector 1 according to the invention is shown in perspective, in side view and in plan view, respectively.
- the main body 2 is a folded tape in two folding directions D1 and D3.
- the main body 2 comprises a first rectilinear portion 9a intended to be brazed on the housing or the printed circuit called "seat", a first circular portion 4a, a second rectilinear portion 9b optional, a twisted central portion 10 where the plane the main ribbon rotates for example by an angle of the order of 90 °, a third optional rectilinear portion 9c, a second circular portion 4b, and a fourth optional rectilinear portion 9d intended to be brazed to the housing or printed circuit called also "sitting".
- the length of the seats can be optimized to have the best compromise between the size of the connector 1 and the length of the periphery of the seats (the longer this length will be, the more the solder will be robust as indicated in the section relating to the prior art).
- This fifth embodiment of the connector 1 has several advantages, and in particular ease of implementation and low cost; an ease of calculation of the stiffness of the connector 1 by finite element calculations; an ease of optimizing the dimensions (width and thickness of the ribbon, radius of curvature of the circular portions 4a and 4b, presence and length of the rectilinear portions 9a-9d, height of the twisted central portion 10, among others) to obtain the stiffnesses desired both in the directions parallel to the plane of the housing and the printed circuit as in the direction perpendicular to this plane, and to obtain the electrical and thermal resistances, as well as the desired electrical impedances and capacitances below a threshold depending on the 'application. It is particularly easy to obtain with this example stiffnesses much lower in the directions parallel to the plane of the housing or printed circuit than in the direction perpendicular to this plane.
- FIG. 6A, 6B and 6C there is shown respectively in perspective, in side view and in top view or below, a sixth embodiment of a connector 1 according to the invention.
- the main body 2 is a folded tape in at least two fold directions D1 and D5.
- the main body 2 comprises a first rectilinear portion 9a intended to be brazed on the housing or the printed circuit called "seat", a first circular portion 4a in a semicircle, a second circular portion 4b quarter circle of concavity opposite to the first circular portion 4a, a second rectilinear portion 9b optional, a twisted central portion 10 where the main plane of the tape rotates for example by an angle of the order of 90 °, a third optional rectilinear portion 9c, a third circular portion 4c in a semicircle, a fourth circular portion 4d quarter-circle concavity opposite that of the third circular portion 4c, and a fourth optional rectilinear portion 9d intended to be soldered on the housing or printed circuit also called " seated ".
- the lengths of the seats and the radii of curvature of the circular portions 4a-4d are adjusted with the width of the ribbon so that, seen from above or below, the projection of the connector 1 has a square shape.
- the length of the seats can be optimized to have the best compromise between the size of the connector 1 and the length of the periphery of the seats.
- This sixth embodiment of the connector 1 has several advantages, including ease of manufacture and low cost; an ease of calculation of the stiffness of the connector 1 by finite element calculations; the possibility of obtaining a vertical projection of square shape facilitating the use and positioning of the connector 1; an ease of optimizing the dimensions (width and thickness of the ribbon, radius of curvature of the circular portions 4a-4d, presence and length of the rectilinear portions 9a-9d, height of the twisted central portion 10, among others) to obtain the desired stiffnesses , both in the directions parallel to the plane of the housing and the printed circuit as in the direction perpendicular to this plane, and to obtain the electrical and thermal resistances, as well as the desired electrical impedances and capacitances below a threshold depending on the application. It is particularly easy to obtain with this example stiffnesses much lower in the directions parallel to the plane of the housing or printed circuit than in the direction perpendicular to this plane.
- each of the first 3a and second 3b ends of the main body 2 has for example a square S connection surface.
- a seventh embodiment of a connector 1 according to the invention.
- the main body 2 is a folded tape according to first D1 and second D2 folding directions at the first end 3a, and according to third D4 and fourth D5 directions of folding at the second end 3b, the first D1 and second D2 folding directions being parallel to each other and orthogonal to the third D3 and fourth D4 folding directions, the third D3 and fourth D4 folding directions being parallel to each other.
- first D1 and second D2 folding directions being parallel to each other and orthogonal to the third D3 and fourth D4 folding directions
- the third D3 and fourth D4 folding directions being parallel to each other.
- the seventh example is characterized in that the central portion 10 of the main body 2 is folded in a 45 ° direction of the first D1, second D2, third D3 and fourth D4 folding directions.
- FIGS. 8A, 8B and 8C an eighth exemplary embodiment of a connector 1 according to the invention is shown respectively in a side view, a top view, a perspective view and a perspective view.
- the main body 2 is a metal sheet folded in two fold directions D1 and D2.
- the main body 2 comprises cutouts 6a, 6b formed between tabs 8 connecting upper parts 7a and 7b lower, respectively comprising the first 3a and second 3b ends.
- the sheet metal is machined, folded and deformed to obtain the connector 1.
- the connector 1 can be made from a piece of stamped metal sheet in which the upper parts 7a, called “head” and lower 7b, called “foot”, and the tabs 8, called “ legs “, connecting the head 7a and the foot 7b.
- the legs 8 are provided substantially curved to reduce the vertical stiffness in the z direction of the connector 1.
- the sheet is then folded in the two folding directions D1 and D2 fold zones ZI and ZI.
- the brazing can then be performed on the head 7a and the foot 7b to connect the connector 1 to the housing and to the printed circuit.
- This eighth embodiment has several advantages, including ease of implementation and low cost; an ease of calculation of the stiffness of the connector 1 by finite element calculations; an ease of optimizing the dimensions (dimensions of the head 7a and the foot 7b, length, width and curvature of the legs 8, among others) to obtain the desired stiffnesses, both in the directions parallel to the plane of the housing and the printed circuit that in the direction perpendicular to this plane, and to obtain the electrical and thermal resistances, as well as the desired electrical impedances and capacitances below a threshold depending on the application. It is particularly easy to obtain with this example very different stiffnesses in the directions parallel to the plane of the housing or the printed circuit than in the direction perpendicular to this plane.
- each of the first 3a and second 3b ends of the main body 2 has a connection surface S whose shape is similar to the letter "U".
- the connectors 1, in the form of wire, ribbon or metal sheet, are elastic.
- These connectors 1 may in particular be able to withstand without damage the lateral movements of relatively large amplitudes due to differential expansions between the housing and the printed circuit.
- the connectors 1 can make it possible to have mechanical stiffnesses in the three x, y and z directions that are adjustable by varying the dimensions and the shape of the main body 2 of the connector 1. These adjustments can in particular use principles and methods known to those skilled in the art, and should be easily calculable by mechanical calculation codes, and for example by finite element methods.
- the connectors 1 can perform the electrical, mechanical or thermal functions assigned to them, being able to quantify, and to be relatively easily simulated by electrical, mechanical or thermal calculation codes to have a reliable prediction of their electrical, mechanical or thermal performance.
- these connectors 1 are different from the columns, previously described in the prior art part, especially in that they have an elastic and non-plastic behavior, and a lower stiffness, especially in the direction vertical z.
- the connectors 1 differ from the springs developed by NASA, previously described in the part relating to the state of the prior art, in particular in that they are less resistive, less inductive and less stiff.
- the connectors 1 in the form of wire are folded in a single vertical plane.
- the connectors 1 have the advantage of having a large connection surface S for brazing.
- the invention can facilitate the calculation and adjustment of the stiffness of the connectors 1 to the desired value, for example by using a commercial mechanical finite element calculation code, in both directions of the plane of the housing and of the printed circuit, and in the direction perpendicular to this plane. This is particularly important to compensate for flatness or non-planarity defects of the housing and the printed circuit.
- These connectors 1 may for example be pre-positioned, for example by means of an element forming a matrix base 40 as described below, brazed on one of the ends 3a and 3b, and then brazed on the other of the ends 3a. and 3b, while pressing with some force on the housing.
- these connectors 1 can play a role of spring and correct defects of non-flatness or non-coplanarity of the housing and the printed circuit, with an easily estimable force depending on the stiffness in the vertical direction z of connectors 1 and defects to be corrected for non-flatness or non-coplanarity.
- the invention has the major advantage of allowing to calculate the stiffness of the connector 1 in the three directions x, y and z.
- the method of calculation to be done can be conventional for the skilled person. For example, it may consist of the following actions:
- the subject of the invention also relates to a microelectronic device, which may be the microelectronic package or the printed circuit, which comprises a plurality of connectors according to the invention, and in particular such as those described in FIGS. seven previous examples.
- These connectors are intended to be arranged on a surface of the device, housing or circuit board, according to a matrix 30 (see FIGS. 9A and 9B) to allow the matrix connection between the housing and the printed circuit.
- the invention also proposes the use of an element forming a matrix base 40 in which a plurality of cavities 41 is formed according to the desired shape of the matrix 30 of the connectors 1, these cavities 41 receiving the connectors 1 for their brazing on the housing or printed circuit board.
- FIGS. 9A and 9B respectively show, in top view, two examples of elements forming a matrix base 40.
- the element forming a matrix base 40 preferably comprises a soluble material, preformed to the dimension of the housing and in which the cavities 41 are made by being adapted to the dimensions of the connectors 1.
- the cavity matrix 41 thus produced in the water-soluble material, is designed to match the matrix of desired positions of connectors 1.
- the cavities 41 may have particularly simple shapes that are easy to produce, such as an elongated rectangular shape whose two ends are rounded (see for example Figure 1C in projection for the first example) or a square shape (see, for example Figure 6C in projection for the sixth example).
- the connectors 1, once positioned, are then brazed to one of the housing and the printed circuit, and then to the other of the housing and the printed circuit.
- the element forming a matrix base 40 can be removable. In this case, the element forming a matrix base 40 can be removed either after the first brazing or after the second brazing.
- the element forming a matrix base 40 when the element forming a matrix base 40 is not intended to be removable, it can remain in place during the life of the connectors 1.
- the element forming a matrix base 40 also has mechanical functions, for example, may at least partially resume the efforts between the housing and the printed circuit. It is however desirable to ensure that the coefficient of expansion and the elastic modulus of the element forming a matrix base 40 are adapted to those of the housing and the printed circuit so as not to generate additional constraints.
- FIGS. 9A and 9B represent possible positions of connectors 1 in FIG. matrix 30 whose stiffnesses are different in the directions x and y.
- a connector 1 can be made from a wire, a ribbon or a plate, especially a sheet, intended to be folded.
- the choice of the metallic material used is important because it must preferentially be compatible with microelectronic processes, especially those known as "back end", be a good conductor of electricity, have a sufficiently high elastic limit to accommodate side shifts caused by the differential expansions of the housing and the printed circuit but without being too high to be able to bend easily.
- the metallic material may be selected from copper, copper-beryllium alloys, brasses, or alloys of the Kovar type (Fe iron, nickel Ni, cobalt Co).
- the method comprises the steps of machining a sheet or a coil by means of a press and a a tool to follow to cut it (the cut is made by shearing, a piece of the piece remaining attached to the body of the sheet or coil), fold-shaping the sheet or coil, and performing a surface treatment of the sheet or coil to make it compatible for brazing. Finally, the connections can be detached by shearing.
- FIG. 10 illustrates four steps a) to d) of a manufacturing method according to the invention for producing a connector 1 whose main body 2 is a wire or a ribbon, namely for example a connector 1 according to the first six examples described previously.
- the method thus comprises the following steps consisting in:
- Figure 11A shows a sheet 50, allowing the manufacture of the connectors 1, cut before folding
- Figure 11B shows the sheet 50 cut after bending, the connectors 1 being still attached thereto.
- FIG. 11C shows, in perspective, an example of a connector 1 according to the invention, detached from the sheet 50.
- the connector 1 is thus obtained from the sheet 50 by implementing setting operations. shaped by folding and cutting, optionally followed by a surface treatment for the subsequent fixing of the connector 1, in particular by brazing.
- the connector 1 has four folding directions D1, D2, D3 and D4, namely first D1 and fourth D4 folding directions, orthogonal to each other, respectively at the first 3a and second 3b ends, and second D2 and third D3 folding directions, parallel to each other and orthogonal to the first D1 and fourth D4 folding directions, at the central portion 10 of the main body 2.
- the second D2 and third D3 folding directions are made so that the main body 2 is bent at an angle of 90 ° at its central portion 10.
- first 3a and second 3b ends of the connector 1 are in a circular form of large section.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Manufacturing Of Electrical Connectors (AREA)
- Structures For Mounting Electric Components On Printed Circuit Boards (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1457692A FR3021814B1 (fr) | 2014-08-08 | 2014-08-08 | Connecteur pour la connexion en matrice entre un boitier et un support, comportant un corps principal plie |
| PCT/EP2015/068073 WO2016020445A1 (fr) | 2014-08-08 | 2015-08-05 | Connecteur pour la connexion en matrice entre un boîtier et un support, comportant un corps principal plié |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3178134A1 true EP3178134A1 (fr) | 2017-06-14 |
Family
ID=51688305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15744953.9A Withdrawn EP3178134A1 (fr) | 2014-08-08 | 2015-08-05 | Connecteur pour la connexion en matrice entre un boîtier et un support, comportant un corps principal plié |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US10320097B2 (fr) |
| EP (1) | EP3178134A1 (fr) |
| FR (2) | FR3021814B1 (fr) |
| WO (1) | WO2016020445A1 (fr) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016006774A1 (de) * | 2016-06-02 | 2017-12-07 | Rosenberger Hochfrequenztechnik Gmbh & Co. Kg | Kontaktierungsanordnung |
| CN108682980B (zh) * | 2018-04-24 | 2024-03-19 | 深圳市信维通信股份有限公司 | 零位移弹片连接器 |
| CN113783066B (zh) * | 2021-08-09 | 2023-10-24 | 番禺得意精密电子工业有限公司 | 电连接器及其制造方法 |
Citations (1)
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|---|---|---|---|---|
| US20140024231A1 (en) * | 2012-07-17 | 2014-01-23 | Hon Hai Precision Industry Co., Ltd. | Electrical connector with x-type dual spring contacts for lower profile and lattice shielding therewith |
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| US5101553A (en) * | 1991-04-29 | 1992-04-07 | Microelectronics And Computer Technology Corporation | Method of making a metal-on-elastomer pressure contact connector |
| JPH07502141A (ja) | 1991-09-30 | 1995-03-02 | ゼネラル・ダイナミックス・インフォメーション・システムズ・インコーポレーテッド | めっきしたしなやかなリード線 |
| US5184962A (en) * | 1991-12-05 | 1993-02-09 | Burndy Corporation | Electrical spring contact |
| DE4320527A1 (de) * | 1992-06-22 | 1993-12-23 | Whitaker Corp | Elektrisch leitfähiges Gel |
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| US6116921A (en) * | 1998-02-16 | 2000-09-12 | The Whitaker Corporation | Electrical connector having recessed solderball foot |
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2014
- 2014-08-08 FR FR1457692A patent/FR3021814B1/fr not_active Expired - Fee Related
- 2014-12-17 FR FR1462584A patent/FR3021815A1/fr active Pending
-
2015
- 2015-08-05 EP EP15744953.9A patent/EP3178134A1/fr not_active Withdrawn
- 2015-08-05 US US15/501,686 patent/US10320097B2/en active Active
- 2015-08-05 WO PCT/EP2015/068073 patent/WO2016020445A1/fr not_active Ceased
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140024231A1 (en) * | 2012-07-17 | 2014-01-23 | Hon Hai Precision Industry Co., Ltd. | Electrical connector with x-type dual spring contacts for lower profile and lattice shielding therewith |
Also Published As
| Publication number | Publication date |
|---|---|
| US20170222340A1 (en) | 2017-08-03 |
| WO2016020445A1 (fr) | 2016-02-11 |
| FR3021814B1 (fr) | 2018-06-15 |
| US10320097B2 (en) | 2019-06-11 |
| FR3021814A1 (fr) | 2015-12-04 |
| FR3021815A1 (fr) | 2015-12-04 |
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