US20070134952A1 - Method of forming a non-continuous conductive layer for laminated substrates - Google Patents
Method of forming a non-continuous conductive layer for laminated substrates Download PDFInfo
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- US20070134952A1 US20070134952A1 US11/675,365 US67536507A US2007134952A1 US 20070134952 A1 US20070134952 A1 US 20070134952A1 US 67536507 A US67536507 A US 67536507A US 2007134952 A1 US2007134952 A1 US 2007134952A1
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- Prior art keywords
- rails
- metal
- circuit board
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- conductive
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- 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
- H05K3/0097—Processing two or more printed circuits simultaneously, e.g. made from a common substrate, or temporarily stacked circuit 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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0271—Arrangements for reducing stress or warp in rigid printed circuit boards, e.g. caused by loads, vibrations or differences in thermal expansion
-
- 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
- H05K1/0313—Organic insulating material
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
- H05K1/0366—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement reinforced, e.g. by fibres, fabrics
-
- 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
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
- H05K2201/09781—Dummy conductors, i.e. not used for normal transport of current; Dummy electrodes of components
-
- 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
- H05K2203/15—Position of the PCB during processing
- H05K2203/1545—Continuous processing, i.e. involving rolls moving a band-like or solid carrier along a continuous production path
-
- 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
- H05K3/0011—Working of insulating substrates or insulating layers
- H05K3/0044—Mechanical working of the substrate, e.g. drilling or punching
- H05K3/0052—Depaneling, i.e. dividing a panel into circuit boards; Working of the edges of circuit 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
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/06—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed chemically or electrolytically, e.g. by photo-etch process
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- 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
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49126—Assembling bases
-
- 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
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49128—Assembling formed circuit to base
-
- 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
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49155—Manufacturing circuit on or in base
-
- 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
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49155—Manufacturing circuit on or in base
- Y10T29/49156—Manufacturing circuit on or in base with selective destruction of conductive paths
Definitions
- the present invention relates to the field of circuit board and substrate manufacture and, more particularly, to a non-continuous conductive layer for laminated substrates.
- PCB printed circuit boards
- a circuit board is a flat piece of insulating material such as fiberglass, epoxy or phenolic resin, on which electrical components are mounted and interconnected to form a circuit.
- the flat piece of insulating material forms the substrate.
- a laminated circuit board is a circuit board in which a conductive layer is laminated onto an insulating layer.
- Circuit boards or PCBs have multiple conductive paths or interconnects to provide electrical connections among circuit components on the board.
- FIG. 1A shows a typical laminated circuit board having a copper layer laminated onto a fiberglass layer. This circuit board or substrate has a thickness of 0.010 inches, a length of 7.2 inches and a width of 1 inch.
- FIG. 1B shows a typical laminated circuit board having a fiberglass layer sandwiched between two metal layers such as copper. This circuit board has a thickness of 0.012 inches, a length of 7.2 inches and a width of 1 inch.
- Circuit boards are commonly used for devices such as memory devices, module boards, video cards, sound cards and the like.
- the connections between components on a circuit board are typically created by using photolithography.
- the circuit pattern is drawn, photographed, and reduced to a negative having the desired final size. This negative is called the photomask or mask.
- Light is passed through the mask onto a substrate having a conductive layer that has been coated with a photoresistive material. Where light strikes the photoresistive material, its composition is changed. In the next step, the photoresistive material not affected by light is washed off. Finally, the circuit board is exposed to an etching solution that eats away the parts of the conductive layer not protected by the photoresistive material, creating the desired circuit pattern on the surface of the circuit board.
- Standard substrates are used for circuit boards and devices such as memory devices. Minor defects or deformations in these substrates or circuit boards can have a significant impact on further processing of the circuit board which includes attaching components, such as integrated circuits, to the circuit board. Processing requires strict tolerances and even minor deformations can damage equipment or render a circuit board useless. For example, even a 1/16′′-1 ⁇ 8′′ bow in a substrate for a dual in line memory module (DIMM) can cause problems in processing the module.
- DIMM dual in line memory module
- FIG. 2 shows a typical circuit board after it has been patterned.
- circuit boards typically include lengths of conductive material along each edge of the circuit board, from one end to the other end. These lengths of conductive material are called rails and are shown in FIG. 2 as a first rail 201 and a second rail 202 .
- the rails 201 and 202 are formed as a result of the patterning.
- the conductive material can be a metal such as copper.
- Conductive materials have a property that once they are deformed or bent, they “remember” that deformation. For example, once a piece of copper is bent a certain way, the piece will have a tendency to bend that certain way even after it is bent a different way. Because of the rails, these circuit boards or substrates have a tendency to remember any deformation that they are subjected to. Circuit boards encounter thermal cycling during processing which causes the expansion and contraction of the substrate. This can result in circuit boards that are warped or deformed.
- a method for fabricating a circuit board having a non-continuous conductive layer is disclosed.
- a conductive layer is laminated onto an insulating layer.
- a pattern is etched on the conductive layer to eliminate continuous lengths of conductive material.
- a method for fabricating a circuit board is disclosed.
- a conductive layer is formed over an insulating layer.
- the conductive layer has a first rail area, a pattern area and a second rail area.
- the pattern area of the conductive layer is patterned. Conductive material from the first and second rail areas is removed.
- a module board includes a circuit board, a pattern and rails.
- the circuit board has a conductive layer of a conductive material laminated to an insulating layer.
- the pattern is etched onto the substrate.
- the rail is located along a first and second length of the substrate.
- the rail is an area not etched from the pattern. Conductive material is at least partially removed from the rails to remove continuous lengths of conductive material from the circuit board.
- FIG. 1A is a cross sectional illustration of a typical laminated circuit board substrate having a copper layer laminated onto a fiberglass layer;
- FIG. 1B is a cross sectional illustration of a typical laminated circuit board substrate having a fiberglass layer sandwiched between two metal layers;
- FIG. 2 is an illustration of a typical circuit board
- FIG. 3A is an illustration of a laminated circuit board according to the present invention.
- FIG. 3B is an illustration of a laminated circuit board according to the present invention.
- FIG. 4A is an illustration of a side view of a module board according to the present invention.
- FIG. 4B is an illustration of a top view of a module board according to the present invention.
- FIG. 4C is an illustration of a side view of a dual sided module board according to the present invention.
- FIG. 4D is an illustration of a top view of a dual sided module board according to the present invention.
- FIG. 4E is an illustration of a bottom view of a dual sided module board according to the present invention.
- FIG. 5 is a method for fabricating a circuit board having a non-continuous conductive layer according to the present invention.
- FIG. 6 is a method for fabricating an electronic device according to the present invention.
- FIG. 7 is a block diagram of a typical computer system in which the invention may be used.
- circuit board refers to a flat piece of insulating material, such as epoxy or phenolic resin, on which electrical components are mounted and interconnected.
- FIG. 2 is an example of a standard circuit board 200 used for memory devices such as dual in line memory modules (DIMMs).
- the circuit board includes a first rail 201 , a second rail 202 , a number of sites 203 and a patterned area 204 .
- a rail is an area along the edge of a circuit board.
- the rails 201 and 202 do not generally contain conductive paths, bonding pads or the like. Thus, the rails 201 and 202 do not get etched and conductive material is not removed from the rails 201 and 202 .
- the rails 201 and 202 include a large amount of conductive material such as copper. The conductive material stretches from one end of the substrate to the other.
- a site is a location where an integrated circuit is attached to the substrate, typically by soldering.
- the patterned area 204 is the area where electrical interconnects and bonding pads are formed by etching away conductive material.
- the patterned area 204 is adjacent to the first rail 201 and the second rail 202 .
- the circuit board 200 of FIG. 2 is susceptible to deformation and warping due to expansion and contraction of the circuit board during thermal cycling. This circuit board has a tendency to remember any deformation that it is subjected to and can cause errors in processing.
- FIG. 3A is a laminated circuit board 300 according to one embodiment of the invention.
- the circuit board 300 includes a first rail 301 , a second rail 302 , a number of sites 303 and a patterned area 305 .
- the patterned area 305 is adjacent to the first rail 301 and the second rail 302 . Even though there are only 3 sites 303 shown in FIG. 3 , the invention is not limited to a specific number of sites.
- the first rail 301 and the second rail 302 have had all conductive material removed and thus, no conductive material remains.
- the patterned area 305 is the area where electrical interconnects and bonding pads are formed by etching away conductive material.
- a conductive material commonly used is copper, however other conductive materials may be used in the circuit board.
- FIG. 3B is a laminated circuit board 300 according to one embodiment of the invention.
- the circuit board 300 includes a first rail 301 , a second rail 302 , a number of sites 303 and a patterned area 305 .
- the patterned area 305 is adjacent to the first rail 301 and the second rail 302 . Even though there are only 3 sites 303 shown in FIG. 3 , the invention is not limited to a specific number of sites.
- the first rail 301 and the second rail 302 have had gaps 304 of conductive material removed and thus, no continuous lengths of conductive materials remain.
- the patterned area 305 is the area where electrical interconnects and bonding pads are formed by etching away conductive material.
- a conductive material commonly used is copper, however other conductive materials may be used in the circuit board.
- FIG. 4A is a side view of a module board 400 according to one embodiment of the invention.
- the module board 400 has a top 406 and is fabricated on a laminated circuit board having an insulating layer 405 and a conductive layer 404 laminated onto the insulating layer.
- a module board is any electronic device made from a circuit board such as video cards, sound cards, memory devices, mother boards, network cards and the like.
- the conductive layer 404 is made from a conductive material such as copper.
- the insulating layer 405 is made from an insulating material such as fiberglass.
- FIG. 4B is top view of a module board 400 according to one embodiment of the invention.
- the module board 400 can be any number of electronic devices such as video cards, sound cards, network cards and the like.
- the module board 400 includes a pattern area 402 in between two rail areas 401 . Alternate embodiments may have one rail or no rails.
- the pattern 402 is etched onto the substrate of the module board 400 . The pattern creates the desired conductive connections, leads and pads on the board 400 . A mask or photomask may be used to etch the pattern so as to remove conductive material. After the pattern 402 is etched, rails 401 along each edge remain and the rails 401 have not had conductive material removed during patterning.
- the rails 401 are partially etched or completely etched so that no continuous lengths of conductive material remains from one end of the board 400 to the other. To remove continuous lengths of conductive material from the rails 401 , all of the conductive material in the rail may be removed or gaps of removed conductive material in the rail could be created.
- the module board 400 can be further processed by connecting integrated circuits and devices while having a reduced tendency to deform or warp compared to boards having continuous lengths of such a conductive material.
- FIG. 4C is a side view of a dual sided module board 409 according to one embodiment of the invention.
- the module board 409 has a top 410 and a bottom 420 .
- the module board 409 is fabricated on a laminated circuit board comprised of a top conductive layer 430 laminated onto an insulating layer 431 laminated onto a bottom conductive layer 432 .
- a module board is any electronic device made from a circuit board such as video cards, sound cards, memory devices, mother boards, network cards and the like.
- the conductive layers 430 and 432 are made from a conductive material such as copper.
- the insulating layer 431 is made from an insulating material such as fiberglass.
- FIG. 4D is top view of a dual sided module board 409 according to one embodiment of the invention.
- the module board 409 can be any number of electronic devices such as video cards, sound cards, network cards and the like.
- the module board 409 includes a pattern area 412 in between two rail areas 411 .
- the pattern 412 is etched onto the substrate of the module board 409 .
- the pattern creates the desired conductive connections, leads and pads on the board 409 .
- a mask or photomask may be used to etch the pattern so as to remove conductive material. After the pattern 412 is etched, rails 411 along each edge remain and the rails 411 have not had conductive material removed during patterning.
- the rails 411 are partially etched or completely etched so that no continuous lengths of conductive material remains from one end of the board 409 to the other. To remove continuous lengths of conductive material from the rails 411 , all of the conductive material in the rail may be removed or gaps of removed conductive material in the rail could be created.
- the module board 409 can be further processed by connecting integrated circuits and devices while having a reduced tendency to deform or warp compared to boards having continuous lengths of such a conductive material.
- FIG. 4E is a bottom view of a dual sided module board 409 according to one embodiment of the invention.
- the module board 409 includes a pattern area 422 in between two rail areas 421 .
- the pattern 422 is etched onto the substrate of the module board 409 .
- the pattern creates the desired conductive connections, leads and pads on the board 409 .
- a mask or photomask may be used to etch the pattern so as to remove conductive material.
- rails 421 along each edge remain and the rails 421 have not had conductive material removed during patterning.
- the rails 421 are partially etched or completely etched so that no continuous lengths of conductive material remains from one end of the board 409 to the other.
- the module board 409 can be further processed by connecting integrated circuits and devices while having a reduced tendency to deform or warp compared to boards having continuous lengths of such a conductive material.
- FIG. 5 is a method 500 for fabricating a circuit board having a non-continuous conductive layer according to one embodiment of the invention.
- a conductive layer is laminated onto an insulating layer at block 501 .
- the conductive layer can be composed of a conductive material such as a metal such as copper.
- the insulating layer can be of a material such as fiberglass.
- a pattern is then etched into the conductive layer of the circuit board at block 502 . This removes some of conductive material and creates the electrical connections and bonding or connecting pads on the circuit board.
- rails have not had any conductive material removed and contain conductive material stretching from one end of the circuit board to the other.
- the rails are etched to remove conductive material from the rails 503 .
- the conductive material may be completely removed from the rails or sections or gaps of conductive material may be removed so that no continuous lengths of conductive material remain.
- FIG. 6 is a method 600 for creating an electronic device according to one embodiment of the invention.
- a first conductive layer is laminated onto an insulating layer at block 601 .
- a second conductive layer is laminated onto the opposite side of the insulating layer at block 602 .
- Conductor patterns for a number of die sites are etched into both conductive layers at block 603 .
- Bonding pads are also etched into the conductive layers 604 .
- Rails having continuous lengths of conductive material remain on the edges of both conductive layers because they have not had conductive material removed from etching.
- the rails are then etched to remove the conductive material, at least partially such that no continuous lengths of conductive material remain on the rails 605 .
- a continuous length of material is a strip of material that completely goes from one end of the circuit board to the other.
- the circuit board then continues processing and integrated circuits are attached to the die sites 606 .
- FIG. 7 is an illustration of a computer system 712 that can use and be used with embodiments of the present invention.
- the computer system 712 would include ROM 714 , mass memory 716 , peripheral devices 718 , and I/O devices 720 in communication with a microprocessor 722 via a data bus 724 or another suitable data communication path. These devices can be fabricated according with the various embodiments of the present invention.
- support and guidance structures used in packaging often have continuous layers of conductive material. Gaps or portions of conductive material can be removed from support and guidance structures to reduce deformations caused by the memory effect.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing Of Printed Circuit Boards (AREA)
- Structure Of Printed Boards (AREA)
- Production Of Multi-Layered Print Wiring Board (AREA)
Abstract
A method of fabricating a circuit board is provided that includes forming a first layer of conductive material over an insulating layer, removing portions of the conductive material to define a first circuit pattern and a first rail area that is electrically isolated from the first circuit pattern, and removing portions of the conductive material from the first rail area. Optionally, the first rail area is positioned generally adjacent to a first edge of the circuit board and spans at least a portion of the length of the first edge. Optionally, portions of the conductive material of the first layer are removed to define a second rail area that is electrically isolated from the first circuit pattern and the first rail area, and portions of the conductive material of the first layer are also removed from the second rail area.
Description
- This is a divisional application of application Ser. No. 10/804,952, filed Mar. 19, 2004 and entitled “METHOD OF FORMING A NON-CONTINUOUS CONDUCTIVE LAYER FOR LAMINATED SUBSTRATES”, which is a divisional application of application Ser. No. 09/968,564, filed Oct. 1, 2001 and entitled “METHOD OF FORMING A NON-CONTINUOUS CONDUCTIVE LAYER FOR LAMINATED SUBSTRATES”, now U.S. Pat. No. 6,729,024, which is a divisional application of application Ser. No. 09/634,064, filed Aug. 8, 2000 and entitled “NON-CONTINUOUS CONDUCTIVE LAYER FOR LAMINATED SUBSTRATES”, now U.S. Pat. No. 6,429,385. This application is also related to application Ser. No. 10/210,219, filed Aug. 1, 2002 and entitled “NON-CONTINUOUS CONDUCTIVE LAYER FOR LAMINATED SUBSTRATES”, now U.S. Pat. No. 6,727,437, which is a continuation application of application Ser. No. 09/634,064, now U.S. Pat. No. 6,429,385.
- The present invention relates to the field of circuit board and substrate manufacture and, more particularly, to a non-continuous conductive layer for laminated substrates.
- Circuit boards and printed circuit boards (PCB) are commonly used in electronic devices of today. Many electronic devices, such as motherboards, memory devices, video adaptors, network cards and the like are created using circuit boards.
- Generally, a circuit board is a flat piece of insulating material such as fiberglass, epoxy or phenolic resin, on which electrical components are mounted and interconnected to form a circuit. The flat piece of insulating material forms the substrate. A laminated circuit board is a circuit board in which a conductive layer is laminated onto an insulating layer. Circuit boards or PCBs have multiple conductive paths or interconnects to provide electrical connections among circuit components on the board.
FIG. 1A shows a typical laminated circuit board having a copper layer laminated onto a fiberglass layer. This circuit board or substrate has a thickness of 0.010 inches, a length of 7.2 inches and a width of 1 inch.FIG. 1B shows a typical laminated circuit board having a fiberglass layer sandwiched between two metal layers such as copper. This circuit board has a thickness of 0.012 inches, a length of 7.2 inches and a width of 1 inch. Circuit boards are commonly used for devices such as memory devices, module boards, video cards, sound cards and the like. - The connections between components on a circuit board are typically created by using photolithography. The circuit pattern is drawn, photographed, and reduced to a negative having the desired final size. This negative is called the photomask or mask. Light is passed through the mask onto a substrate having a conductive layer that has been coated with a photoresistive material. Where light strikes the photoresistive material, its composition is changed. In the next step, the photoresistive material not affected by light is washed off. Finally, the circuit board is exposed to an etching solution that eats away the parts of the conductive layer not protected by the photoresistive material, creating the desired circuit pattern on the surface of the circuit board.
- Standard substrates are used for circuit boards and devices such as memory devices. Minor defects or deformations in these substrates or circuit boards can have a significant impact on further processing of the circuit board which includes attaching components, such as integrated circuits, to the circuit board. Processing requires strict tolerances and even minor deformations can damage equipment or render a circuit board useless. For example, even a 1/16″-⅛″ bow in a substrate for a dual in line memory module (DIMM) can cause problems in processing the module.
-
FIG. 2 shows a typical circuit board after it has been patterned. After a circuit board is patterned, circuit boards typically include lengths of conductive material along each edge of the circuit board, from one end to the other end. These lengths of conductive material are called rails and are shown inFIG. 2 as a first rail 201 and asecond rail 202. Therails 201 and 202 are formed as a result of the patterning. The conductive material can be a metal such as copper. Conductive materials have a property that once they are deformed or bent, they “remember” that deformation. For example, once a piece of copper is bent a certain way, the piece will have a tendency to bend that certain way even after it is bent a different way. Because of the rails, these circuit boards or substrates have a tendency to remember any deformation that they are subjected to. Circuit boards encounter thermal cycling during processing which causes the expansion and contraction of the substrate. This can result in circuit boards that are warped or deformed. - What is needed is a way to reduce warping or deforming of circuit boards during processing.
- A method for fabricating a circuit board having a non-continuous conductive layer is disclosed. A conductive layer is laminated onto an insulating layer. A pattern is etched on the conductive layer to eliminate continuous lengths of conductive material.
- A method for fabricating a circuit board is disclosed. A conductive layer is formed over an insulating layer. The conductive layer has a first rail area, a pattern area and a second rail area. The pattern area of the conductive layer is patterned. Conductive material from the first and second rail areas is removed.
- A module board is disclosed. The module board includes a circuit board, a pattern and rails. The circuit board has a conductive layer of a conductive material laminated to an insulating layer. The pattern is etched onto the substrate. The rail is located along a first and second length of the substrate. The rail is an area not etched from the pattern. Conductive material is at least partially removed from the rails to remove continuous lengths of conductive material from the circuit board.
- Other methods, systems and devices are disclosed.
-
FIG. 1A is a cross sectional illustration of a typical laminated circuit board substrate having a copper layer laminated onto a fiberglass layer; -
FIG. 1B is a cross sectional illustration of a typical laminated circuit board substrate having a fiberglass layer sandwiched between two metal layers; -
FIG. 2 is an illustration of a typical circuit board; -
FIG. 3A is an illustration of a laminated circuit board according to the present invention; -
FIG. 3B is an illustration of a laminated circuit board according to the present invention; -
FIG. 4A is an illustration of a side view of a module board according to the present invention; -
FIG. 4B is an illustration of a top view of a module board according to the present invention; -
FIG. 4C is an illustration of a side view of a dual sided module board according to the present invention; -
FIG. 4D is an illustration of a top view of a dual sided module board according to the present invention; -
FIG. 4E is an illustration of a bottom view of a dual sided module board according to the present invention; -
FIG. 5 is a method for fabricating a circuit board having a non-continuous conductive layer according to the present invention; -
FIG. 6 is a method for fabricating an electronic device according to the present invention; and -
FIG. 7 is a block diagram of a typical computer system in which the invention may be used. - The term “patterning” refers to one or more steps that result in the removal of selected portions of layers. The patterning process is also known by the names photomasking, masking, photolithography and microlithography. The term “circuit board” refers to a flat piece of insulating material, such as epoxy or phenolic resin, on which electrical components are mounted and interconnected.
- As stated earlier,
FIG. 2 is an example of astandard circuit board 200 used for memory devices such as dual in line memory modules (DIMMs). The circuit board includes a first rail 201, asecond rail 202, a number ofsites 203 and apatterned area 204. A rail is an area along the edge of a circuit board. Therails 201 and 202 do not generally contain conductive paths, bonding pads or the like. Thus, therails 201 and 202 do not get etched and conductive material is not removed from therails 201 and 202. Therails 201 and 202 include a large amount of conductive material such as copper. The conductive material stretches from one end of the substrate to the other.FIG. 2 only shows 3 die sites or sites, however any number of sites such as 12 can be on a single circuit board. A site is a location where an integrated circuit is attached to the substrate, typically by soldering. The patternedarea 204 is the area where electrical interconnects and bonding pads are formed by etching away conductive material. The patternedarea 204 is adjacent to the first rail 201 and thesecond rail 202. Thecircuit board 200 ofFIG. 2 is susceptible to deformation and warping due to expansion and contraction of the circuit board during thermal cycling. This circuit board has a tendency to remember any deformation that it is subjected to and can cause errors in processing. -
FIG. 3A is alaminated circuit board 300 according to one embodiment of the invention. Thecircuit board 300 includes afirst rail 301, asecond rail 302, a number ofsites 303 and apatterned area 305. The patternedarea 305 is adjacent to thefirst rail 301 and thesecond rail 302. Even though there are only 3sites 303 shown inFIG. 3 , the invention is not limited to a specific number of sites. Thefirst rail 301 and thesecond rail 302 have had all conductive material removed and thus, no conductive material remains. The patternedarea 305 is the area where electrical interconnects and bonding pads are formed by etching away conductive material. A conductive material commonly used is copper, however other conductive materials may be used in the circuit board. By having the conductive material removed from therails circuit board 300 has a reduced tendency to warp or deform. -
FIG. 3B is alaminated circuit board 300 according to one embodiment of the invention. Thecircuit board 300 includes afirst rail 301, asecond rail 302, a number ofsites 303 and apatterned area 305. The patternedarea 305 is adjacent to thefirst rail 301 and thesecond rail 302. Even though there are only 3sites 303 shown inFIG. 3 , the invention is not limited to a specific number of sites. Thefirst rail 301 and thesecond rail 302 have hadgaps 304 of conductive material removed and thus, no continuous lengths of conductive materials remain. The patternedarea 305 is the area where electrical interconnects and bonding pads are formed by etching away conductive material. A conductive material commonly used is copper, however other conductive materials may be used in the circuit board. By having thegaps 304 of conductive material removed from therails circuit board 300 has a reduced tendency to warp or deform. -
FIG. 4A is a side view of amodule board 400 according to one embodiment of the invention. Themodule board 400 has a top 406 and is fabricated on a laminated circuit board having an insulatinglayer 405 and aconductive layer 404 laminated onto the insulating layer. For the purposes of describing and defining the present invention, a module board is any electronic device made from a circuit board such as video cards, sound cards, memory devices, mother boards, network cards and the like. Theconductive layer 404 is made from a conductive material such as copper. The insulatinglayer 405 is made from an insulating material such as fiberglass. -
FIG. 4B is top view of amodule board 400 according to one embodiment of the invention. Themodule board 400 can be any number of electronic devices such as video cards, sound cards, network cards and the like. For this embodiment, themodule board 400 includes apattern area 402 in between tworail areas 401. Alternate embodiments may have one rail or no rails. Thepattern 402 is etched onto the substrate of themodule board 400. The pattern creates the desired conductive connections, leads and pads on theboard 400. A mask or photomask may be used to etch the pattern so as to remove conductive material. After thepattern 402 is etched, rails 401 along each edge remain and therails 401 have not had conductive material removed during patterning. Therails 401 are partially etched or completely etched so that no continuous lengths of conductive material remains from one end of theboard 400 to the other. To remove continuous lengths of conductive material from therails 401, all of the conductive material in the rail may be removed or gaps of removed conductive material in the rail could be created. Themodule board 400 can be further processed by connecting integrated circuits and devices while having a reduced tendency to deform or warp compared to boards having continuous lengths of such a conductive material. -
FIG. 4C is a side view of a dualsided module board 409 according to one embodiment of the invention. Themodule board 409 has a top 410 and a bottom 420. Themodule board 409 is fabricated on a laminated circuit board comprised of a topconductive layer 430 laminated onto an insulatinglayer 431 laminated onto a bottomconductive layer 432. For the purposes of describing and defining the present invention, a module board is any electronic device made from a circuit board such as video cards, sound cards, memory devices, mother boards, network cards and the like. Theconductive layers layer 431 is made from an insulating material such as fiberglass. -
FIG. 4D is top view of a dualsided module board 409 according to one embodiment of the invention. Themodule board 409 can be any number of electronic devices such as video cards, sound cards, network cards and the like. Themodule board 409 includes apattern area 412 in between tworail areas 411. Thepattern 412 is etched onto the substrate of themodule board 409. The pattern creates the desired conductive connections, leads and pads on theboard 409. A mask or photomask may be used to etch the pattern so as to remove conductive material. After thepattern 412 is etched, rails 411 along each edge remain and therails 411 have not had conductive material removed during patterning. Therails 411 are partially etched or completely etched so that no continuous lengths of conductive material remains from one end of theboard 409 to the other. To remove continuous lengths of conductive material from therails 411, all of the conductive material in the rail may be removed or gaps of removed conductive material in the rail could be created. Themodule board 409 can be further processed by connecting integrated circuits and devices while having a reduced tendency to deform or warp compared to boards having continuous lengths of such a conductive material. -
FIG. 4E is a bottom view of a dualsided module board 409 according to one embodiment of the invention. Themodule board 409 includes apattern area 422 in between tworail areas 421. Thepattern 422 is etched onto the substrate of themodule board 409. The pattern creates the desired conductive connections, leads and pads on theboard 409. A mask or photomask may be used to etch the pattern so as to remove conductive material. After thepattern 422 is etched, rails 421 along each edge remain and therails 421 have not had conductive material removed during patterning. Therails 421 are partially etched or completely etched so that no continuous lengths of conductive material remains from one end of theboard 409 to the other. To remove continuous lengths of conductive material from therails 421, all of the conductive material in the rail may be removed or gaps of removed conductive material in the rail could be created. Themodule board 409 can be further processed by connecting integrated circuits and devices while having a reduced tendency to deform or warp compared to boards having continuous lengths of such a conductive material. -
FIG. 5 is amethod 500 for fabricating a circuit board having a non-continuous conductive layer according to one embodiment of the invention. A conductive layer is laminated onto an insulating layer atblock 501. The conductive layer can be composed of a conductive material such as a metal such as copper. The insulating layer can be of a material such as fiberglass. A pattern is then etched into the conductive layer of the circuit board atblock 502. This removes some of conductive material and creates the electrical connections and bonding or connecting pads on the circuit board. However, rails have not had any conductive material removed and contain conductive material stretching from one end of the circuit board to the other. The rails are etched to remove conductive material from therails 503. The conductive material may be completely removed from the rails or sections or gaps of conductive material may be removed so that no continuous lengths of conductive material remain. -
FIG. 6 is a method 600 for creating an electronic device according to one embodiment of the invention. A first conductive layer is laminated onto an insulating layer at block 601. A second conductive layer is laminated onto the opposite side of the insulating layer atblock 602. Conductor patterns for a number of die sites are etched into both conductive layers atblock 603. Bonding pads are also etched into theconductive layers 604. Rails having continuous lengths of conductive material remain on the edges of both conductive layers because they have not had conductive material removed from etching. The rails are then etched to remove the conductive material, at least partially such that no continuous lengths of conductive material remain on therails 605. A continuous length of material is a strip of material that completely goes from one end of the circuit board to the other. The circuit board then continues processing and integrated circuits are attached to thedie sites 606. -
FIG. 7 is an illustration of acomputer system 712 that can use and be used with embodiments of the present invention. As will be appreciated by those skilled in the art, thecomputer system 712 would includeROM 714,mass memory 716,peripheral devices 718, and I/O devices 720 in communication with amicroprocessor 722 via adata bus 724 or another suitable data communication path. These devices can be fabricated according with the various embodiments of the present invention. - Having described the invention in detail and by reference to preferred embodiments thereof, it will be apparent that modifications and variations are possible without departing from the scope of the invention defined in the appended claims. For example, support and guidance structures used in packaging often have continuous layers of conductive material. Gaps or portions of conductive material can be removed from support and guidance structures to reduce deformations caused by the memory effect.
Claims (8)
1. A method of fabricating a memory device on a laminated circuit board wherein the laminated circuit board has a length, a width and a thickness, the method comprising:
laminating a metal layer to an insulating layer;
removing metal from the metal layer to define conductive paths, bonding pads, and rails, said rails defined along at least a portion of the edges of the length of the circuit board where no metal has been removed, said rails electrically isolated from said conductive paths and bonding pads; and,
etching the rails to remove metal therefrom.
2. The method of claim 1 , wherein etching the rails includes removing all metal from the rails.
3. A method of fabricating a memory device on a laminated circuit board, wherein the laminated circuit board has a length, a width and a thickness comprising:
laminating a first metal layer to a first side of an insulating layer;
laminating a second metal layer to a second side of an insulating layer;
etching conductive paths and bonding pads onto the first metal layer to define at least one first side die site and at least one first side rail wherein said first side rail comprises a continuous strip of said first metal layer that is electrically isolated from said at least one first side die site;
etching conductive paths and bonding pads onto the second metal layer to define at least one second side die site and at least one second side rail, wherein said second side rail comprises a continuous strip of said second metal layer that is electrically isolated from said at least one second side die site; and,
etching either said at least one first side rail, said at least one second side rail, or both said at least one first side rail and said at least one second side rail to remove at least a portion of the metal.
4. The method of claim 3 , wherein etching conductive paths and bonding pads onto the first metal layer for at least one first side die site comprises removing metal from the first metal layer, resulting in forming rails along edges of the length of the first metal layer where the rails have no metal removed and wherein etching conductive paths and bonding pads onto the second metal layer for at least one second side die site comprises removing metal from the metal layer, resulting in forming rails along edges of the length of the second metal layer where the rails have no metal removed.
5. The method of claim 3 , wherein etching the rails comprises removing sections of metal from the rails.
6. The method of claim 3 , wherein etching the rails comprises removing all metal from the rails.
7. A method of forming a circuit board comprising:
forming a circuit board having an insulating layer sandwiched between a first conductive layer and a second conductive layer;
etching said first conductive layer defining a first site comprising a first patterned area of conductive traces, and a first generally rectangular rail extending adjacent to a first edge of said first conductive layer spanning substantially the length thereof, said first rail electrically isolated from said first patterned area and comprises gaps etched into said first conductive layer; and,
etching said second conductive layer defining a second site comprising a second patterned area of conductive traces, a third generally rectangular rail extending adjacent to a first edge of said second conductive layer spanning substantially the length thereof, and a fourth generally rectangular rail extending adjacent to a second edge of said second conductive layer spanning substantially the length thereof, said third and fourth rails electrically isolated from said second patterned area and comprise gaps etched into said second conductive layer.
8. A method of forming a circuit board according to claim 7 , further comprising:
a second generally rectangular rail extending adjacent to a second edge of said first conductive layer spanning substantially the length thereof, said second rail electrically isolated from said first patterned area and comprises gaps etched into said first conductive layer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/675,365 US20070134952A1 (en) | 2000-08-08 | 2007-02-15 | Method of forming a non-continuous conductive layer for laminated substrates |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/634,064 US6429385B1 (en) | 2000-08-08 | 2000-08-08 | Non-continuous conductive layer for laminated substrates |
US09/968,564 US6729024B2 (en) | 2000-08-08 | 2001-10-01 | Method of forming a non-continuous conductive layer for laminated substrates |
US10/804,952 US7216425B2 (en) | 2000-08-08 | 2004-03-19 | Method of forming a non-continuous conductive layer for laminated substrates |
US11/675,365 US20070134952A1 (en) | 2000-08-08 | 2007-02-15 | Method of forming a non-continuous conductive layer for laminated substrates |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/804,952 Division US7216425B2 (en) | 2000-08-08 | 2004-03-19 | Method of forming a non-continuous conductive layer for laminated substrates |
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US20070134952A1 true US20070134952A1 (en) | 2007-06-14 |
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US09/968,564 Expired - Lifetime US6729024B2 (en) | 2000-08-08 | 2001-10-01 | Method of forming a non-continuous conductive layer for laminated substrates |
US10/210,219 Expired - Lifetime US6727437B2 (en) | 2000-08-08 | 2002-08-01 | Non-continuous conductive layer for laminated substrates |
US10/804,952 Expired - Fee Related US7216425B2 (en) | 2000-08-08 | 2004-03-19 | Method of forming a non-continuous conductive layer for laminated substrates |
US11/675,365 Abandoned US20070134952A1 (en) | 2000-08-08 | 2007-02-15 | Method of forming a non-continuous conductive layer for laminated substrates |
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US09/634,064 Expired - Lifetime US6429385B1 (en) | 2000-08-08 | 2000-08-08 | Non-continuous conductive layer for laminated substrates |
US09/968,564 Expired - Lifetime US6729024B2 (en) | 2000-08-08 | 2001-10-01 | Method of forming a non-continuous conductive layer for laminated substrates |
US10/210,219 Expired - Lifetime US6727437B2 (en) | 2000-08-08 | 2002-08-01 | Non-continuous conductive layer for laminated substrates |
US10/804,952 Expired - Fee Related US7216425B2 (en) | 2000-08-08 | 2004-03-19 | Method of forming a non-continuous conductive layer for laminated substrates |
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WO2016149269A1 (en) * | 2015-03-19 | 2016-09-22 | Fci Asia Pte. Ltd | Comprehensive layout strategy for flip chipping integrated circuits |
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US6429385B1 (en) * | 2000-08-08 | 2002-08-06 | Micron Technology, Inc. | Non-continuous conductive layer for laminated substrates |
JP2002074300A (en) * | 2000-08-31 | 2002-03-15 | Shinko Electric Ind Co Ltd | Non-contact type ic card and method for manufacturing the same |
JP4768994B2 (en) * | 2005-02-07 | 2011-09-07 | ルネサスエレクトロニクス株式会社 | Wiring board and semiconductor device |
MX2009009525A (en) * | 2007-03-07 | 2009-09-16 | Kyorin Seiyaku Kk | Glucokinase activator. |
JP2010135418A (en) * | 2008-12-02 | 2010-06-17 | Shinko Electric Ind Co Ltd | Wiring board and electronic component device |
US20150147839A1 (en) * | 2013-11-26 | 2015-05-28 | Infineon Technologies Dresden Gmbh | Method for manufacturing a semiconductor device |
KR20170000458A (en) * | 2015-06-23 | 2017-01-03 | 삼성전자주식회사 | Substrate Strip |
JP7126878B2 (en) * | 2018-06-26 | 2022-08-29 | 新光電気工業株式会社 | wiring board |
CN110913583B (en) * | 2019-10-23 | 2021-06-18 | 广州陶积电电子科技有限公司 | Method for improving warping of asymmetric copper thick substrate and substrate |
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Also Published As
Publication number | Publication date |
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US6727437B2 (en) | 2004-04-27 |
US20020189851A1 (en) | 2002-12-19 |
US6429385B1 (en) | 2002-08-06 |
US7216425B2 (en) | 2007-05-15 |
US20040172821A1 (en) | 2004-09-09 |
US20020017396A1 (en) | 2002-02-14 |
US6729024B2 (en) | 2004-05-04 |
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