# US 6,716,672 B2 · Three dimensional interconnection method and electronic device obtained by same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,716,672 B2 - Document ID: US6716672B2 - Status: Granted - Kind: B2 - Application number: 10/182,720 - Filed: 2002-08-09 - Published: 2003-01-16 - Granted: 2004-04-06 - Earliest claimed: 2000-02-11 - Assignees: 3D Plus - Inventors: Christian Val - Web page: https://patentgrep.com/patent/US6716672B2 ## CPC - H10W 90/00: Package configurations - H10W 70/40: Leadframes - H10W 72/536: {the connected ends being ball-shaped} - H10W 72/5363: {the connected ends being wedge-shaped} - H10W 72/801: {Interconnections on sidewalls of containers} - H10W 74/00: Encapsulations, e.g. protective coatings - H10W 90/756: {between a chip and a stacked lead frame, conducting package substrate or heat sink} - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A method of interconnection in three dimensions and to an electronic device obtained by the method. To increase the compactness of integrated circuit modules, the method stacks and adhesively bonds packages containing a chip connected to output leads by connection conductors inside each package, cuts through the packages near the chips to form a block, the conductors being flush with the faces of the block, and makes the connections on the faces of the block by metalizing and then etching the outlines of the connections. The method also applies to the matching of packages in the replacement of obsolete circuits. ## Claims ### Claim 1 A method of interconnection in three dimensions for at least two packages each containing at least one electronic component and furnished with connection conductors for connecting, inside the at least two packages, connection pads on each of at least one electronic component to output leads toward an outside of the at least two packages, the method comprising: a) stacking and assembling the at least two packages to be interconnected; b) cutting through the at least two packages, near the electronic components, to form a block leaving cross sections of the connection conductors flush on faces of the block; c) producing electrical connections between the cross sections of the connection conductors that are flush on the faces of the block. ### Claim 2 (depends on 1) The method as claimed in claim 1, for interconnecting plural packages together, wherein said stacking and assembling a) includes stacking and adhesively bonding the plural packages. ### Claim 3 (depends on 1) The method as claimed in claim 1, wherein each electronic component is an electronic chip, and the cutting b) is carried out at a distance of between about 0.5 and 2 mm from the electronic chips. ### Claim 4 (depends on 1) The method as claimed in claim 1, wherein the producing the electrical connections c) comprises: c1) metalizing the faces of the block; and c2) etching outlines of the connections. ### Claim 5 (depends on 4) The method as claimed in claim 4, wherein etching the outlines of the connections c2) is carried out by laser etching. ### Claim 6 A method of interconnection in three dimensions for at least one package that contains at least one electronic component and is furnished with connection conductors inside the at least one package, and a matching circuit including a printed circuit, of a first selection array and of a second matching array, said first and second arrays being placed along edges of the matching circuit, the method comprising: a) stacking and assembling the matching circuit against the at least one package; b) cutting through the at least one package, near the electronic components, to form a block leaving cross section of the connection conductors flush on faces of the block; c) making electrical connections between the cross sections of the connection conductors that are flush on the faces of the block. ### Claim 7 (depends on 6) The method as claimed in claim 6, for interconnecting the at least one package with a circuit for matching an array of output leads, wherein the stacking and assembly a) includes stacking and assembling the matching circuit against the at least one package by adhesive bonding or encapsulation. ### Claim 8 (depends on 7) The method as claimed in claim 7, wherein said matching circuit includes a printed circuit along edges of which, on a face that faces the at least one package, a first array for selecting the output leads of the package to be connected and a second matching array are placed, the matching circuit is assembled with the at least one package so that a plane of cutting cuts off ends of the first and second arrays of the matching circuit. ### Claim 9 (depends on 6) The method as claimed in claim 6, wherein the at least one electronic component is an electronic chip, and the cutting b) is carried out at a distance of between 0.5 and 2 mm from the electronic chips. ### Claim 10 An electronic device with interconnection in three dimensions, comprising packages that contain at least one electronic component and are furnished with connection conductors inside the packages, in which electronic device, the packages are stacked and adhesively bonded, wherein the electronic device is formed by a block cut through the packages near the electronic components so that the connection conductors are flush with faces of the block, and wherein the faces of the block bear connections connecting the connection conductors. ### Claim 11 An electronic device with interconnection in three dimensions, comprising: a package that contains at least one electronic component and is furnished with connection conductors inside the package; a matching circuit with which the package is assembled and including a printed circuit of a first selection array and of a second matching array, the first and second arrays being placed along edges of the printed circuit, on first and second faces of the printed circuit, respectively, the first face carrying the first array facing the package and the package/matching circuit assembly having been cut through the package, and ends of the first and second arrays form a block in which a section of the connection conductors and of the first and second arrays is flush with faces of the block, and wherein the faces of the block carry connections connecting said connection conductors to the first selection array. ### Claim 12 (depends on 11) The electronic device as claimed in claim 11, wherein the faces of the block are metalized and etched to define outlines of said connections and to isolate the sections of the second array.