WO2006013742A1 - 半田ボール搭載方法及び半田ボール搭載装置 - Google Patents
半田ボール搭載方法及び半田ボール搭載装置 Download PDFInfo
- Publication number
- WO2006013742A1 WO2006013742A1 PCT/JP2005/013504 JP2005013504W WO2006013742A1 WO 2006013742 A1 WO2006013742 A1 WO 2006013742A1 JP 2005013504 W JP2005013504 W JP 2005013504W WO 2006013742 A1 WO2006013742 A1 WO 2006013742A1
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- WIPO (PCT)
- Prior art keywords
- solder
- ball
- cylindrical member
- printed wiring
- wiring board
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/06—Solder feeding devices; Solder melting pans
- B23K3/0607—Solder feeding devices
- B23K3/0623—Solder feeding devices for shaped solder piece feeding, e.g. preforms, bumps, balls, pellets, droplets
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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
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3457—Solder materials or compositions; Methods of application thereof
- H05K3/3478—Applying solder preforms; Transferring prefabricated solder patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/42—Printed circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
- H01L2224/0554—External layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
- H01L2224/0554—External layer
- H01L2224/0556—Disposition
- H01L2224/05568—Disposition the whole external layer protruding from the surface
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
- H01L2224/0554—External layer
- H01L2224/05573—Single external layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/11—Manufacturing methods
- H01L2224/113—Manufacturing methods by local deposition of the material of the bump connector
- H01L2224/1133—Manufacturing methods by local deposition of the material of the bump connector in solid form
- H01L2224/11334—Manufacturing methods by local deposition of the material of the bump connector in solid form using preformed bumps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/74—Apparatus for manufacturing arrangements for connecting or disconnecting semiconductor or solid-state bodies and for methods related thereto
- H01L2224/741—Apparatus for manufacturing means for bonding, e.g. connectors
- H01L2224/742—Apparatus for manufacturing bump connectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/00014—Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01004—Beryllium [Be]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01068—Erbium [Er]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01078—Platinum [Pt]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01079—Gold [Au]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/151—Die mounting substrate
- H01L2924/153—Connection portion
- H01L2924/1531—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface
- H01L2924/15311—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface being a ball array, e.g. BGA
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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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/04—Soldering or other types of metallurgic bonding
- H05K2203/041—Solder preforms in the shape of solder balls
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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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/05—Patterning and lithography; Masks; Details of resist
- H05K2203/0548—Masks
- H05K2203/0557—Non-printed masks
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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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/08—Treatments involving gases
- H05K2203/082—Suction, e.g. for holding solder balls or components
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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
- Y10T29/53—Means to assemble or disassemble
- Y10T29/5313—Means to assemble electrical device
- Y10T29/532—Conductor
- Y10T29/53209—Terminal or connector
Definitions
- the present invention relates to a solder ball mounting method and a solder ball mounting apparatus for mounting solder balls to be solder bumps on a printed wiring board.
- solder bumps are used for electrical connection between a knock substrate and an IC chip.
- the solder bump is formed by the following process.
- a printing technique disclosed in Patent Document 1 is used.
- a ball alignment mask 116 having an opening 116a is placed on the printed wiring board 30 at a position facing the connection pad 75, and soldered with a squeegee 124.
- the ball 78s was dropped on the connection pad 75.
- Patent Document 1 JP 2001-267773 A
- solder bumps on the knock board are required to have a smaller diameter and a smaller pitch.
- the solder balls have a diameter smaller than that of sand grains having a diameter of less than 200 ⁇ , and in the method using the ball alignment mask and the squeegee described above, the solder bump height varies and the quality deteriorates.
- solder balls that tend to agglomerate are sent in contact with the squeegee, so that the solder balls are damaged and some of them are chipped. If a part of the solder ball is missing, the volume of the solder bump will be different on each connection pad. As described above, the solder bump height varies. If solder bumps with a small volume are present, thermal stress concentrates on the solder bumps, which reduces connection reliability.
- the surface of the printed wiring board is not flat.
- the build-up multilayer wiring board has large irregularities on the surface.
- a recessed portion is formed in the ball alignment mask along the unevenness of the printed wiring board.
- An object of the present invention is to provide a solder ball mounting method and a solder ball mounting device capable of reliably mounting a solder ball having a diameter of less than 200 ⁇ on a connection pad. Means for solving the problem
- the invention of claim 1 uses a ball alignment mask having a plurality of openings corresponding to connection pads of a printed wiring board, and solder balls to be solder bumps are formed on the printed wiring board.
- a solder ball mounting method for mounting on a connection pad wherein a cylindrical member having an opening facing the ball alignment mask is positioned above the ball alignment mask, and air is sucked by the cylindrical member. Then, the solder balls are assembled on the ball alignment mask directly under the cylindrical member,
- the solder ball assembled on the ball alignment mask is moved by moving the cylindrical member in the horizontal direction, and the solder ball is connected to the connection pad of the printed wiring board through the opening of the ball alignment mask. It is a technical feature that it is dropped to
- the invention of claim 2 is a solder ball mounting device for mounting a solder ball to be a solder bump on a connection pad of a printed wiring board,
- a ball alignment mask having a plurality of openings corresponding to the connection pads of the printed wiring board, and located above the ball alignment mask and directly below the openings by sucking air from the openings.
- the invention of claim 3 is a solder ball mounting device for mounting a solder ball to be a solder bump on a connection pad of a printed wiring board,
- a ball alignment mask having a plurality of openings corresponding to connection pads of a printed wiring board, and a cylindrical member that is located above the ball alignment mask and collects solder balls directly under the openings by sucking air from the openings
- the technical feature is that the left and right directions differ.
- the invention of claim 8 uses a ball alignment mask having a plurality of openings corresponding to the connection pads in the connection pad area of the printed wiring board, and solder balls to be solder bumps are used as connection pads of the printed wiring board.
- a solder ball mounting method for mounting
- a cylindrical member having a lower end of an opening whose clearance with the ball alignment mask is different in the front-rear direction and the left-right direction with respect to the moving direction is positioned above the ball alignment mask, and air is sucked by the cylindrical member.
- the solder balls are assembled on the ball alignment mask immediately below the cylindrical member, and the solder balls assembled on the ball alignment mask are moved by moving the cylindrical member in the horizontal direction,
- the technical feature is that the solder balls are dropped onto the connection pads of the printed wiring board through the openings of the ball alignment mask.
- the invention of claim 9 is a solder ball mounting device for mounting a solder ball to be a solder bump on an electrode of a printed wiring board, A ball alignment mask having a plurality of openings corresponding to the electrodes of the printed wiring board, and a cylindrical member that is located above the ball alignment mask and collects solder balls directly under the openings by sucking air from the openings.
- a technical feature is that at least a solder ball contact portion of the cylindrical member is formed of a conductive member.
- the invention of claim 13 uses a ball alignment mask having a plurality of openings corresponding to the connection pads of the printed wiring board, and mounts a solder bow that becomes solder bumps on the connection pads of the printed wiring board.
- a conductive cylinder member having an opening facing the ball alignment mask is positioned above the ball alignment mask, and air is sucked by the cylinder member, so that the ball alignment mask immediately below the cylinder member is drawn. Collect solder balls on top,
- the solder ball assembled on the ball alignment mask is moved by moving the cylindrical member in the horizontal direction, and the solder ball is connected to the connection pad of the printed wiring board through the opening of the ball alignment mask. It is a technical feature that it is dropped to
- the invention of claim 14 is a solder ball mounting device for mounting a solder ball to be a solder bump on each connection pad in a connection pad region of a printed wiring board,
- a ball alignment mask having a plurality of openings corresponding to connection pads of a printed wiring board, and a cylindrical member that is located above the ball alignment mask and collects solder balls directly under the openings by sucking air from the openings
- a moving mechanism for dropping the solder balls onto the connection pads of the printed wiring board, and the opening of the cylindrical member is substantially rectangular,
- the length of the side of the opening parallel to the cylinder member movement direction is 1.1 to 4 times the length of the side of the connection pad area parallel to the cylinder member movement direction,
- the technical feature is that the length of the side of the opening perpendicular to the direction of movement of the cylindrical member is 1.1 to 4 times the length of the side of the connection pad area perpendicular to the direction of movement of the cylindrical member. To do.
- the invention of claim 17 uses a ball alignment mask having a plurality of openings corresponding to the connection pads in the connection pad area of the printed wiring board, and mounts solder balls to be solder bumps on the connection pads of the printed wiring board.
- the opening has a substantially rectangular shape, and the length of the side of the opening parallel to the cylinder member moving direction is 1.1 to the length of the side of the connection pad area parallel to the cylinder member moving direction.
- the length of the side perpendicular to the cylindrical member moving direction of the opening is 1.1 to 4 times the length of the side perpendicular to the cylindrical member moving direction of the connection pad area.
- the solder ball assembled on the ball alignment mask is moved by moving the cylindrical member in the horizontal direction, and the solder ball is connected to the connection pad of the printed wiring board through the opening of the ball alignment mask. It is a technical feature that it is dropped to
- the invention of claim 18 uses a ball alignment mask having a plurality of openings corresponding to electrodes that also expose the opening force of the solder resist layer of the printed wiring board.
- a solder ball mounting method for mounting a ball on an electrode of a printed wiring board
- a cylindrical member having an opening is positioned above the ball alignment mask, and air is sucked by the cylindrical member, thereby assembling the solder balls on the ball alignment mask immediately below the cylindrical member,
- the solder balls assembled on the ball alignment mask are mounted on the connection pads of the printed wiring board through the openings of the ball alignment mask. Is a technical feature.
- the invention of claim 19 is an electrode in which the opening force of the solder resist layer of the printed wiring board is also exposed. And a solder ball mounting method for mounting solder balls to be solder bumps, wherein the surface of the solder resist layer is flattened,
- a cylindrical member having an opening is positioned above the flattened solder resist layer, and air is sucked by the cylindrical member, so that solder balls are gathered on the solder resist layer directly below the cylindrical member,
- a technical feature is that the solder balls assembled on the solder resist layer are mounted on the connection pads of the printed wiring board by moving the cylindrical member in the horizontal direction.
- solder ball mounting method of claim 1 the solder ball mounting device of claim 2, and the solder ball mounting method of claim 8, a cylindrical member is positioned above the ball alignment mask, and the cylindrical member Opening force of the solder Collecting the solder balls by sucking air and moving the cylindrical member in the horizontal direction, the assembled solder balls move on the ball alignment mask, and the ball alignment mask The solder ball is dropped onto the connection pad of the printed wiring board through the opening. For this reason, fine solder balls can be reliably mounted on all connection pads of the printed wiring board.
- solder balls are moved in a non-contact manner, unlike the case of using a squeegee, they can be mounted on the connection pads without damaging the solder balls, and the height of the solder bumps can be made uniform. Furthermore, a solder ball can be appropriately placed on the connection pad even on a printed wiring board with many undulations on the surface, such as a build-up multilayer wiring board. In addition, since there is no contact, solder balls are unlikely to agglomerate, so one solder ball can be reliably mounted on the connection pad.
- the clearance between the opening at the lower end of the cylindrical member and the ball alignment mask is front and rear with respect to the moving direction of the cylindrical member. Since the direction differs from the left and right directions, the force applied to the solder balls from four directions (front and rear, left and right) is uneven due to the airflow flowing through the clearance. For this reason, the collision frequency of the solder balls decreases in the cylindrical member assembled by the air flow, and the solder balls easily fall into the opening of the ball alignment mask. In addition, chipping of solder balls is reduced and the solder bump volume is easy to stabilize.
- the opening at the lower end of the cylindrical member, the ball alignment mask Since the clearance between the front and rear in the direction of movement of the cylindrical member is wider than that of the left and right clearances, the solder ball can be moved back and forth in the direction of travel as the cylindrical member moves. That is, the solder ball moves with the movement of the cylindrical member, but when the cylindrical member enters the stationary state force movement state, first, the relative position of the solder ball once changed to the rear side rather than the central position of the cylindrical member. Later, it passes the center position by the airflow of the backward force and comes to the front side. Then, it goes to the rear side by the airflow from the front. That is, as the cylindrical member moves, the solder ball force moves toward the front and back in the direction of travel of the central force of the cylindrical member, and easily falls into the opening of the ball alignment mask.
- solder ball mounting device since the opening of the cylindrical member has a substantially rectangular shape, the solder balls are assembled into a rectangular shape, and the solder ball is applied to the connection pad in the connection pad region having a substantially rectangular shape. It can be mounted efficiently.
- connection pad region is a region of 75A in FIG. 8 and includes a connection pad located on the outermost periphery, and is a rectangular region having the smallest area.
- x and y include the outermost connection pad and the rectangular area of the connection pad region 75A is the smallest.
- solder ball mounting device since the solder balls remaining on the ball alignment mask can be collected by the suction cylinder, excess solder balls remain and do not cause troubles such as failure. .
- the cylindrical member is positioned above the ball alignment mask, the opening force of the cylindrical member is sucked to collect the solder balls, and the cylindrical member is By moving in the horizontal direction, the assembled solder balls are moved on the ball alignment mask, and the solder balls are dropped onto the connection pads of the printed wiring board through the openings of the ball alignment mask. For this reason, fine solder balls can be reliably mounted on all connection pads of the printed wiring board. Also, since the solder balls are moved in a non-contact manner, unlike the case of using a squeegee, the solder pads are not damaged and the connection pads are It can be mounted and the height of the solder bump can be made uniform. Furthermore, a solder ball can be appropriately placed on the connection pad even on a printed wiring board having a large undulation on the surface, such as a build-up multilayer wiring board.
- solder ball contact portion of the cylindrical member is constituted by the conductive member. Therefore, a solder ball that is small in diameter and light in weight can be securely mounted on a printed wiring board without being attached to the cylindrical member due to static electricity.
- the cylindrical member is made of a conductive metal, a solder ball that does not adhere to the cylindrical member due to static electricity even when a small-diameter, lightweight solder ball is charged is printed wiring. It can be securely mounted on a plate.
- the cylindrical member is formed of a conductive flexible member, the solder ball that does not adhere to the cylindrical member due to static electricity even when a small-diameter and lightweight solder ball is charged is provided. It can be securely mounted on a printed wiring board.
- the metal film is disposed on the surface of the resin for the cylindrical member, the solder ball that does not adhere to the cylindrical member due to static electricity even when the small-diameter and lightweight solder ball is charged. It can be securely mounted on a printed wiring board.
- solder ball when the solder ball is moved onto the ball alignment mask and sent, even if the solder ball is charged by mutual collision, the cylindrical member is conductive, so that the small diameter and lightweight semi-conductor is used. Solder balls can be reliably mounted on the printed wiring board, where the field balls do not adhere to the cylinder member due to static electricity.
- the cylindrical member is positioned above the ball alignment mask, and air is sucked from the opening of the cylindrical member. Assemble the solder balls and move the cylindrical member in the horizontal direction to move the assembled solder balls over the ball alignment mask and print the solder balls through the opening of the ball alignment mask. Drop it onto the connection pad on the board. For this reason, fine solder balls can be reliably mounted on all connection pads of the printed wiring board. Also, because the solder balls are moved in a non-contact manner, unlike using a squeegee, they can be mounted on the connection pads without damaging the solder balls, and the height of the solder bumps is made uniform. be able to.
- solder ball can be appropriately placed on a connection pad even on a printed wiring board having a large undulation on the surface, such as a build-up multilayer wiring board.
- solder balls are unlikely to agglomerate, so one solder ball can be reliably mounted on the connection pad.
- the solder balls can be assembled in a substantially rectangular shape, and the solder balls can be efficiently mounted on the connection pads in the connection pad region having a substantially rectangular shape.
- the length of the side of the opening of the cylindrical member parallel to the direction of movement of the cylindrical member is 1.1 to 4 times the length of the side of the connection pad area parallel to the direction of movement of the cylindrical member.
- the length of the side perpendicular to the direction of movement of the cylinder part is 1.1 to 4 times the length of the side of the connection pad area perpendicular to the direction of movement of the cylindrical member.
- Solder balls can be collected in the area.
- solder balls If it is less than 1 times, it becomes impossible to mount solder balls on the connection pads on the outer periphery of the connection pad area. If it exceeds four times, the solder balls do not collect at the center of the cylindrical member, and the solder balls cannot be mounted on the connection pads in the center of the connection pad area.
- solder ball mounting device of claim 15 (the length of the side parallel to the cylindrical member moving direction of the opening) / (the length of the side parallel to the cylindrical member moving direction of the connection pad region) , (Length of side perpendicular to cylinder member moving direction of opening) / (length of side perpendicular to cylinder member moving direction of connection pad region).
- the solder balls can be gathered so as to be long in the moving direction of the cylindrical member with respect to the connection pad area having a substantially rectangular shape, and the solder balls are attached to the connection pads in the connection pad area having a substantially rectangular shape. It can be mounted efficiently.
- solder ball mounting device since the wind speed between the cylindrical member and the ball alignment mask is 5 to 35 m / sec, the solder balls are appropriately collected on the connection pad region and connected. Solder balls can be efficiently mounted on the pads.
- the wind speed is less than 5 mZsec, the solder balls are concentrated on the outer peripheral portion of the cylindrical member, so that it is difficult to mount the solder balls on the connection pad region located at the center of the connection pad region.
- the wind speed exceeds 35 mZsec, the solder balls are concentrated at the center of the cylindrical member, so that it becomes difficult to mount the solder balls on the connection pad area located at the outer periphery of the connection pad area.
- connection pad area is the 75A area in FIG. 8 and is the connection pad located in the outermost layer. This is a rectangular region that includes a grid and has the smallest area. As shown in FIG. 13C, when the connection pad 75 is not arranged in a rectangular shape, the connection pad region including the outermost connection pad is included so that the rectangular area of the connection pad region 75A is minimized. Set.
- the cylindrical member is positioned above the ball alignment mask, the opening force of the cylindrical member is sucked to collect the solder balls, and the cylindrical member is By sending them in the horizontal direction, the assembled solder balls are moved on the ball alignment mask, and the solder balls are dropped onto the connection pads of the printed wiring board through the openings of the ball alignment mask. For this reason, fine solder balls can be reliably mounted on all the connection pads of the printed wiring board. Also, since the solder balls are moved in a non-contact manner, unlike the case of using a squeegee, they can be mounted on the connection pads without damaging the solder balls, and the height of the solder bumps can be made uniform. In addition, since there is no contact, the solder balls are unlikely to agglomerate, so one solder ball can be reliably mounted on the connection pad.
- the surface of the semi-cured or dried solder resist layer is pressed with a flat member to make the surface flat. Therefore, since the surface of the ball alignment mask on the printed wiring board is also flattened, the solder ball can be easily moved on the ball alignment mask. For this reason, one solder ball can be placed on the connection pad of the solder ball.
- the surface of the semi-cured or dried solder resist layer is flattened by pressing with a flat member, and the cylindrical member is positioned above the flattened solder resist layer, thereby opening force of the cylindrical member.
- Solder balls are gathered by sucking air, and the cylindrical member is sent in the horizontal direction, so that the solder balls can be moved on the printed wiring board and one solder ball can be placed on the connection pad. it can. Since the ball alignment mask is not used, the problem of misalignment with the ball alignment mask opening can be eliminated even if the opening of the solder resist layer on the printed wiring board becomes fine.
- FIG. Fig. 6 shows a cross-sectional view of the multilayer printed wiring board 10
- Fig. 7 shows an IC on the multilayer printed wiring board 10 shown in Fig. 6.
- a state in which the chip 90 is attached and placed on the daughter board 94 is shown.
- conductor circuits 34 are formed on both surfaces of the core substrate 30.
- the upper surface and the back surface of the core substrate 30 are connected through a through hole 36.
- a conductor circuit 58 for forming a conductor circuit layer is formed on the conductor circuit 34 of the core substrate 30 via an interlayer resin insulation layer 50.
- the conductor circuit 58 is connected to the conductor circuit 34 via the via hole 60.
- a conductor circuit 158 is formed on the conductor circuit 58 via an interlayer resin insulation layer 150.
- the conductor circuit 158 is connected to the conductor circuit 58 through a via hole 160 formed in the interlayer resin insulation layer 150.
- a solder resist layer 70 is formed on the upper layer of the via hole 160 and the conductor circuit 158, and the nickel plating layer 72 and the gold plating layer 74 are provided in the opening 71 of the solder resist layer 70, thereby providing a connection.
- a pad 75 is formed.
- a solder bump 78U is formed on the upper connection pad 75, and a BGA (ball grid array) 78D is formed on the lower connection pad 75.
- the solder bump 78 U on the upper surface side of the multilayer printed wiring board 10 is connected to the land 92 of the IC chip 90.
- the lower BGA78D is connected to the land 96 of the daughter board 94.
- FIG. 8 is a plan view of a multilayer printed wiring board 10A for multi-piece production.
- the multilayer printed wiring board 10A is separated by cutting the individual multilayer printed wiring board 10 having the connection pad region 75A along the dashed line in the figure.
- FIG. 5 is an explanatory diagram of the process of forming solder bumps on the multilayer printed wiring board 10A for multi-piece production, and corresponds to the Y1-Y1 cross-sectional view in FIG.
- flux 80 is printed on the surface of the multilayer printed wiring board 10A in which the connection pads 75 are formed in the openings 71 of the solder resist layer 70 on the surface.
- solder ball 78s for example, made by Hitachi Metals, Tamura, diameter 40 is formed on the upper connection pad 75 of the multilayer printed wiring board 10A using a solder ball mounting device described later. ⁇ m ⁇ or more and less than 200 ⁇ m). Solder balls with a diameter of less than 200 ⁇ ⁇ are desirable for finer applications. If the diameter is less than 40 ⁇ , the solder balls are too light and do not fall on the connection pads. On the other hand, if the diameter exceeds 200 / ⁇ ⁇ , it is too heavy, so it cannot be soldered into the cylindrical member and there is a connection pad on which no solder ball is placed. Become so.
- solder ball having a diameter of 40 ⁇ to a diameter of less than 200 ⁇ it is highly significant to use a solder ball having a diameter of 40 ⁇ to a diameter of less than 200 ⁇ . In this range, it is advantageous for fine colors. Further, in the method in which the solder ball is sucked by the suction head and the solder ball is mounted on the connection pad, since the solder ball is small and difficult to be sucked, the superiority of the method of the embodiment becomes clear.
- the suction head according to the prior art for example, Patent No. 1975429 is used for the normal diameter (diameter 250 m).
- Adhere and place 78L of solder balls After that, it is heated in a reflow oven, and as shown in Fig. 6, solder bumps 7 8U are placed on the upper side of the multilayer printed wiring board 10A at a pitch of 60 ⁇ m or more and less than 200 ⁇ m, for example, 500 to 30000 Equivalent), for example, 250 BGA 78Ds are formed on the lower side with a pitch of 2 mm.
- connection pad area becomes large, so it is highly meaningful to apply the method of the present invention. Since this is non-contact, the bump height is stable, and solder bumps with low height are unlikely to occur, so a printed wiring board with high connection reliability can be obtained. If the pitch is less than 60 / zm, it becomes difficult to manufacture solder balls suitable for the pitch. If the pitch is 200 m or more, it can be manufactured without any problems in this method, but it can also be manufactured by the conventional method. Further, as shown in FIG. 7, after the multi-layer printed wiring board 10A for multi-pieces is cut into the multi-layer printed wiring board 10 and then the IC chip 90 is mounted via the solder bumps 78U by reflow. The multilayer printed wiring board 10 with the IC chip 90 mounted is attached to the daughter board 94 through the BGA78D.
- solder ball mounting device that mounts a small (less than 200 ⁇ m ⁇ ) solder ball 78 s on the connection pad of the multilayer printed wiring board described above with reference to FIG. 5B. To explain.
- the solder ball mounting device 20 positions and holds the multilayer printed wiring board 10A.
- Ball alignment mask 16 having a corresponding opening, mounting cylinder (cylinder member) 24 for guiding a solder ball moving on ball alignment mask 16, and mounting cylinder 24
- a suction box 26 that applies a negative pressure to the suction ball
- a suction ball removal cylinder 61 for collecting excess solder balls
- a suction box 66 that applies a negative pressure to the suction ball removal cylinder 61, and the recovered solder balls
- the alignment camera 46 detects the alignment mark of the multilayer printed wiring board 10 on the ⁇ suction table 14, and the positions of the multilayer printed wiring board 10 and the ball alignment mask 16 are determined based on the detected position. Adjusted.
- the remaining amount detection sensor 18 detects the remaining amount of solder balls by an optical method.
- solder ball mounting process by the solder ball mounting apparatus 20 will be described with reference to FIGS.
- alignment mark 34 M of multi-layer printed wiring board 10A for multi-pieces is recognized by alignment camera 46, and the position of multilayer printed wiring board 10A relative to ball alignment mask 16 is determined. Correct with XY 0 suction table 14. That is, the openings 16a of the ball alignment mask 16 correspond to the connection pads 75 of the multilayer printed wiring board 10A, respectively. Adjust the position as follows.
- the solder ball 78s is quantitatively supplied from the solder ball supply device 22 to the mounting cylinder 24 side. In addition, you may supply in a mounting cylinder previously.
- the mounting cylinder 24 is positioned above the ball alignment mask 16 while maintaining a predetermined clearance (for example, 0.5 to 4 times the ball diameter) with the ball alignment mask.
- a predetermined clearance for example, 0.5 to 4 times the ball diameter
- the flow velocity in the gap between the mounting cylinder and the printed wiring board is set to 5 m / s ec to 35 m / sec, and the ball alignment mask just below the opening 24A of the mounting cylinder 24 Solder ball 78s was put on top of 16.
- the multilayer printed wiring boards 10A shown in FIGS. 1 (B) and 1 (A) were arranged along the Y axis.
- the mounting cylinder 24 is fed in the horizontal direction along the X axis via the X direction moving shaft 40.
- the solder balls 78s assembled on the ball alignment mask 16 are moved along with the transfer of the mounting cylinder 24, and the solder balls 78s are moved through the openings 16a of the ball alignment mask 16 to the multilayer printed wiring board 10A.
- the solder balls 78s are sequentially aligned on all the connection pads on the multilayer printed wiring board 10A side.
- the mounting cylinder 24 is positioned above the ball alignment mask 16, and the mounting cylinder 24 By sucking air from the suction part 24B, the solder balls 78s are gathered, and by sending the mounting cylinder 24 in the horizontal direction, the gathered solder balls 78s are moved over the ball alignment mask 16, and the ball alignment mask. Solder balls 78s are printed in multiple layers through 16 openings 16a. Drop it onto the connection pad 75 of the wire board 10A. Therefore, the fine solder balls 78s can be reliably mounted on all the connection pads 75 of the multilayer printed wiring board 10A.
- solder ball 78s is moved in a non-contact manner, unlike using a squeegee, the solder ball can be mounted on the connection pad 75 without scratching, and the height of the solder bump 78U should be uniform. Can do. For this reason, it excels in the mountability of electronic parts such as ICs, post-mounting heat cycle tests, and environmental resistance tests such as high temperature and high humidity tests. Furthermore, since it does not depend on the flatness of the product, there are many undulations on the surface, and the solder balls can be appropriately placed on the connection pads even on a printed wiring board.
- connection pad pitch 60 to 150 ⁇ m and a solder resist opening diameter of 0 to 100 ⁇ m. All bumps can be solder bumps with a stable bump height.
- Example 1 and Examples 2-5 which will be described later, the solder balls are guided by a suction force, so that aggregation and adhesion of the solder balls can be prevented. Furthermore, by adjusting the number of mounting cylinders 24, it can be applied to workpieces of various sizes (worksheet-sized multilayer printed wiring boards), so it can be flexibly applied to high-mix, low-volume production. It is possible.
- the mounting cylinder 24 is made to correspond to the width of the workpiece (worksheet-sized multilayer printed wiring board). Since multiple mounting cylinders 24 are arranged in the Y direction, the solder balls can be securely attached to all the connection pads 7 5 of the multilayer printed wiring board 10A simply by sending a plurality of mounting cylinders 24 in the direction perpendicular to the column direction (X direction). Can be installed.
- Example 1 and Example 2-5 which will be described later, since the solder ball 78s remaining on the ball alignment mask 16 can be collected by the suction ball removing cylinder 61, an excessive solder ball remains, a failure, etc. No cause of failure.
- a double-sided copper-clad laminate (for example, MCL-E-6 7 manufactured by Hitachi Chemical Co., Ltd.) was used as a starting material, and through-hole conductors and conductor circuits were formed on this substrate by a known method.
- well-known methods for example, “Build-Atsu” published by Nikkan Kogyo Shimbun, June 20, 2000
- Layer multilayer printed wiring board (by Kiyoshi Takagi) alternately layered interlayer insulation layers and conductor circuit layers. 120 / ⁇ ⁇ , 150 /
- a connection pad area consisting of 50 x 50 (zigzag arrangement) with zm pitch was formed.
- a commercially available solder resist was formed thereon, and an opening of ⁇ 90 m was formed on the connection pad by photographic method.
- the via pad force connection pad (a solder bump is formed immediately above the via hole) is preferred for filled vias.
- the dent amount and convex amount are 5% of the conductor thickness of conductor circuit 158.
- a range of ⁇ 5 ⁇ m is desirable. If the depth of the filled via exceeds 5 ⁇ m (15 m), the contact point between the solder ball and the connection pad that also has the filled via force decreases, so the wettability becomes worse when solder bumps are formed, and voids are formed in the solder. It is easy to get stuck or not mounted (Missing bump). On the other hand, if it exceeds 5 / zm, the thickness of the conductor circuit 158 becomes thick, so it is not suitable for fine lines.
- a commercially available solder resist was formed on it (thickness 20 m), and an opening of 90 ⁇ was formed by photographic method in the solder resist on the connection pad to expose the connection pad.
- a commercially available rosin flux was applied to the surface (IC mounting surface) of the printed wiring board fabricated in (1). After that, it is mounted on the suction table of the above-described solder ball mounting device of the present invention, and the printed wiring board and the alignment mark of the ball alignment mask are recognized using a CCD camera, and the printed wiring board and the ball alignment mask are positioned.
- the ball alignment mask a Ni metal mask having an opening of 110 m ⁇ at a position corresponding to the connection pad of the printed wiring board was used.
- the thickness of the metal mask is preferably 1/4 to 3/4 of the solder ball.
- the opening diameter formed in the ball alignment mask is preferably 1.1 to 1.5 times the diameter of the ball used.
- a SUS mounting cylinder with a size corresponding to the connection pad area (1.1 to 4 times the area where the connection pad is formed) and a height of 200 mm is used.
- a Sn63Pb37 solder ball (manufactured by Hitachi Metals Co., Ltd.) having a ball diameter of 80 ⁇ was placed on the ball alignment mask in the vicinity of the periphery of the metal mask (ball alignment mask) with a clearance of ⁇ 4 times.
- Example 1 the force using SnZPb solder for the solder ball Sn and Ag, Cu, In, Bi, Zn, etc. Pb-free solder may also be used, where the group power is also selected. Then, air was sucked in from the upper part of the mounting cylinder, and the flow velocity in the gap between the mounting cylinder and the printed wiring board was adjusted to 5 to 35 mZsec and assembled in the mounting cylinder. After that, the mounting cylinder was sent at a moving speed of 10 to 40 mmZsec to move the solder ball, and the solder ball was dropped from the opening of the ball alignment mask to mount the solder ball on the connection pad.
- solder ball alignment mask After removing the excess solder balls from the ball alignment mask, the solder ball alignment mask and the printed wiring board were removed separately from the solder ball mounting device. Finally, the printed wiring board on which the solder balls were mounted in (2) was put into a reflow set at 230 degrees to form solder bumps.
- Example 2 will be described with reference to FIG. 9 and FIG.
- the clearance (gap) between the lower end opening 240 of the mounting cylinder 24 and the alignment mask 16 is formed uniformly.
- the clearance differs in the front-rear direction and the left-right direction with respect to the moving direction of the mounting cylinder 24.
- Fig. 9 (A) is a front view of the mounting cylinder 24 as viewed from the direction of travel
- Fig. 9 (B) is a side view
- Fig. 9 (C) is a plan view of the mounting cylinder 24 as viewed from above. It is.
- the mounting cylinder 24 is configured in a cubic shape, and Gapl between the front wall 24 F and rear wall 24R on the front side in the traveling direction and the ball alignment mask 16 is the right wall 24r and left on the left and right in the traveling direction. It is configured to be larger than Gap2 between the wall 241 and the ball alignment mask 16. That is, the right wall 24r and the left wall 241 are configured to extend downward from the front wall 24F and the rear wall 24R.
- FIG. 10 (A) is a schematic diagram for explaining the movement of the solder ball when the clearance of the mounting cylinder is the same in the front-rear direction and the left-right direction.
- the force applied to the solder ball group 78G from four directions front and rear, left and right
- the frequency of collision between the solder balls increases in the mounting cylinder 24 gathered by the airflow, particularly at the center position, and it is difficult to drop into the mask opening 16a.
- FIG. 10B is a schematic diagram for explaining the movement of the solder ball when the clearance of the mounting cylinder in the second embodiment differs between front and rear and left and right. If the clearance is different in the front-rear direction and the left-right direction, the solder balls are The force applied to the group 78G becomes non-uniform, and the collision frequency of the solder balls decreases in the mounting cylinder 24 that is gathered by the air flow, and it is easy to fall into the mask opening 16a. As a result of the measurement, it was found that the wind speed flowing in through the front and rear clearances and the wind speed flowing in through the left and right clearances hardly changed. In other words, depending on the clearance, the wind speed hardly changed, but the air volume changed and the work volume changed.
- the front and rear clearances of the mounting cylinder 24 should be wider than the left and right clearances.
- the solder ball can be moved back and forth in the traveling direction along the mounting cylinder 24 as the mounting cylinder 24 moves. That is, as shown in FIG. 9 (C1), when the mounting cylinder 24 is stationary, the solder balls are gathered at the center of the mounting cylinder.
- the mounting cylinder 24 Since the solder ball group 78G moves behind the movement of 24, first, as shown in FIG. 10 (C2), the solder ball group 78G changes relative to the rear side from the center position of the mounting cylinder 24.
- the solder ball group 78G passes the center position by the airflow from the rear and comes to the front side (Fig. 10 (C3)). Furthermore, it goes to the rear side by the airflow from the front. That is, as the mounting cylinder 24 moves, the central position force of the solder ball group 78G force mounting cylinder 24 also moves back and forth and back and forth in the traveling direction, and easily falls into the mask opening 16a.
- the opening of the mounting cylinder 24 is substantially rectangular, so that the solder balls are assembled as a substantially rectangular solder ball group 78G as shown in Fig. 10 (C1). Solder balls can be efficiently mounted on the individual connection pads 75 in the substantially rectangular connection pad region 75A shown in FIG.
- the opening of the mounting cylinder 24 is formed in a substantially rectangular shape, but it is also possible to make the front and rear clearances and the left and right clearances different from each other in a cylindrical shape or an elliptical shape. is there.
- solder ball was sent using a squeegee, and the solder ball was dropped from the opening for mounting the ball to mount the solder ball on the connection pad.
- Example 1 of the present invention the bump height increases and the bump height variation is small. This is because in the first embodiment, the solder balls are not shaved with a squeegee or the like, and thus the initial volume of the solder balls is maintained and mounted on the connection pads.
- Example 1 500 printed wiring boards obtained in Example 1 and Comparative Example 1 were prepared, and an IC was mounted. The continuity of the IC mounting board was checked and the mounting yield was determined. The result was 90% for the printed wiring board of Example 1 and 3% for Comparative Example 1. After that, 10 samples from each non-defective product were taken at random, and a heat cycle test of 55 x 5 minutes 125 x 5 minutes was performed 1000 times, and the IC was mounted from the back side of the printed wiring board (the side opposite to the IC mounting side). The amount of change in the connection resistance of the specific circuit connected to the back side of the printed wiring board was measured again. The amount of change in connection resistance is ((connection resistance after initial connection resistance after heat cycle) Z initial connection resistance) X 100. If this value exceeds 10%, it becomes defective.
- Example 1 the bump height variation is small, so the bump contact It can be seen that the subsequent reliability is high.
- Example 1 non-defective products that can guarantee reliability are 0%.
- solder ball mounting method according to the second embodiment the solder ball mounting method according to the first embodiment having the same clearance, and the prior art, which have different clearances before and after the mounting cylinder 24 described above with reference to FIGS.
- the results of a comparison test with the solder bump manufactured by this method (Comparative Example 1 described above) will be described.
- front, rear, right and left are front and rear and left and right with respect to the traveling direction of the mounting cylinder.
- an IC is mounted on the printed wiring boards of Example 1 and Comparative Example 2, and the IC is mounted between the IC and the printed wiring board. Filled with underfill to obtain an IC-mounted printed wiring board. After that, the connection resistance of the specific circuit connected to the back surface of the IC-mounted printed wiring board via the IC was measured again as the initial value through the back surface of the IC-mounted printed wiring board (the side opposite to the IC mounting surface). After measuring the initial value, leave it in an atmosphere of 85 ° CX 80% for 15 hours, and then continue the heat cycle test with one cycle of 55 ° CX for 5 minutes and 125 ° CX for 5 minutes. Resistance was measured to check connection reliability.
- connection resistance value of initial connection resistance value after heat cycle connection resistance value of initial value of Z
- connection resistance value of initial value of Z connection resistance value of initial value of Z
- the configuration of the multilayer printed wiring board 10 manufactured using the solder ball mounting method and mounting apparatus according to Example 3 of the present invention will be described below.
- the configuration of the multilayer printed wiring board 10 of the third embodiment is the same as that of the first embodiment described above with reference to FIGS.
- the manufacturing process is the same as that of the first embodiment described above with reference to FIG.
- the solder ball mounting apparatus of the third embodiment is substantially the same as the first embodiment described above with reference to FIG. 1 except for the structure of the mounting cylinder 24.
- FIG. 13A is an explanatory diagram showing, in an enlarged manner, the connection pad region 75A on the multilayer printed wiring board 10A in FIG. 8 and the mounting cylinder 24 of the third embodiment.
- the mounting cylinder 24 has a lower end opening 24A (see FIG. 2B) formed in a rectangular shape. Therefore, the solder balls can be assembled into a substantially rectangular shape, and the solder balls can be efficiently mounted on the connection pads 75 in the connection pad region 75A having a substantially rectangular shape.
- the side ax (length of the inner wall) 24X parallel to the mounting cylinder movement direction (X direction) of the opening is the length ax of the side 75X of the connection pad area 75A parallel to the mounting cylinder movement direction. It is set to a (l. 1-4) times X.
- connection pad region is a region 75A in FIG. 13 (A), which includes a connection pad located on the outermost periphery and has a minimum area.
- Figure 13 As shown in (C), when the connection pad 75 is not arranged in a rectangular shape, x and y are set so that the rectangular area of the connection pad region 75A is minimized including the outermost connection pad.
- Example 3 the length of the side 24 X parallel to the cylindrical member movement direction (X direction) of the opening of the mounting cylinder 24 Z of the side 75X parallel to the mounting cylinder movement direction of the Z connection pad region 75A
- the length (magnification a) of the side 24Y perpendicular to the mounting cylinder movement direction of the opening is made larger than the length (magnification b) of the side 75Y perpendicular to the movement direction of the mounting cylinder in the Z connection pad area 75A.
- the solder ball group 78G can be formed so as to be long in the moving direction (X direction) of the mounting cylinder 24 with respect to the connection pad region 75A having a substantially rectangular shape.
- the solder balls can be efficiently mounted on the connection pads 75 in the connection pad region 75A having a substantially rectangular shape.
- the mounting cylinder 24 is made of a conductive metal such as SUS stainless steel, Ni, or Cu, and is grounded to the solder ball mounting device 20 side.
- the solder balls are moved onto the ball alignment mask 16 and sent, even if the solder balls are charged by mutual collision, the small and light solder balls will adhere to the mounting cylinder 24 due to static electricity. It is possible to securely mount solder balls on the printed wiring board.
- the mounting cylinder 24 of the solder ball mounting device 20 and the suction ball removing cylinder 61 are arranged on individual multi-layer printed wiring boards 10A. Multiple Y-directions are arranged corresponding to 75A.
- one mounting cylinder 24 corresponds to one connection pad area 75A, but the mounting cylinder 24 may be sized to correspond to a plurality of connection pad areas 75A.
- the Y direction is convenient and may be arranged in the X direction.
- the ⁇ suction table 14 positions, sucks, holds, and corrects the multilayer printed wiring board 10 on which the solder balls are mounted.
- the alignment camera 46 detects the alignment mark of the multilayer printed wiring board 10 on the ⁇ suction table 14, and the positions of the multilayer printed wiring board 10 and the ball alignment mask 16 are determined based on the detected position. Adjusted.
- the remaining amount detection sensor 18 detects the remaining amount of solder balls by an optical method.
- solder ball mounting process by the solder ball mounting apparatus 20 of the third embodiment is the same as that of the first embodiment described above with reference to FIGS.
- a double-sided copper-clad laminate (for example, MCL-E-6 7 manufactured by Hitachi Chemical Co., Ltd.) was used as a starting material, and through-hole conductors and conductor circuits were formed on this substrate by a known method. After that, interlayer insulation layers and conductor circuit layers are alternately laminated by a well-known method (for example, “Build-up multilayer printed wiring board” published by Nikkan Kogyo Shimbun on June 20, 2000) In the outermost conductor circuit layer, a connection pad group was formed for electrical connection to the IC, and the connection pad group had a diameter of 120 ⁇ in the connection pad area (70 mm 2 : 10 mm x 7 mm).
- the amount of protrusion is preferably in the range of -5 to 5 ⁇ m with respect to the conductor thickness of conductor circuit 158.
- solder balls Because there are fewer contact points of the connection pad that also has a filled via force When solder bumps are used, the wettability deteriorates, and it is easy to get voids in the solder or not to be mounted (mixing bumps), but if it exceeds 5 / zm, the thickness of the conductor circuit 158 will increase. Not suitable for fine candy.
- a commercially available solder resist was formed on it (thickness 20 m), and an opening of 90 ⁇ was formed by photographic method in the solder resist on the connection pad to expose the connection pad.
- a commercially available rosin flux was applied to the surface (IC mounting surface) of the printed wiring board fabricated in (1). After that, it is mounted on the suction table of the above-described solder ball mounting device of the present invention, and the printed wiring board and the alignment mark of the ball alignment mask are recognized using a CCD camera, and the printed wiring board and the ball alignment mask are positioned.
- the ball alignment mask a Ni metal mask having an opening with a diameter of 110 ⁇ at a position corresponding to the connection pad of the printed wiring board was used.
- the thickness of the metal mask is preferably 1/4 to 3/4 of the solder ball.
- the opening diameter formed in the ball alignment mask is preferably 1.1 to 1.5 times the diameter of the ball used.
- it has a size corresponding to the connection pad area (1.1 to 4 times the area where the connection pad is formed) and a height of 20
- An Omm SUS mounting cylinder is placed on a metal mask (ball alignment mask) with a clearance of 0.5 to 4 times the solder ball diameter, and the ball diameter is 80 ⁇ m on the ball alignment mask in the vicinity.
- a ⁇ Sn63Pb37 solder ball manufactured by Hitachi Metals was placed.
- the force using SnZPb solder for the solder ball Sn and Pb-free solder in which group forces such as Ag, Cu, In, Bi, Zn, etc. are also selected may be used.
- Parameter (2) Gap between the mounting cylinder and the ball alignment mask (0.5 to 2.5 times the solder ball diameter)
- Parameter (3) Area of the bottom opening 24 (A) of the mounting cylinder (see Fig. 2 (B) and Fig. 13)
- the wind speed between the mounting cylinder and the ball alignment mask is 5 to 35 mZsec
- the wind speed can be set to 0.1 lmZsec to 2 mZsec.
- the mounting cylinder was sent at a moving speed of 20 mmZsec to move the solder ball, and the solder ball was dropped from the opening of the ball alignment mask to mount the solder ball on the connection pad.
- the mounting cylinder 24 is made of a conductive metal such as SUS stainless steel, Ni, or Cu, and is grounded to the solder ball mounting device 20 side.
- the solder ball alignment mask and the printed wiring board were removed separately from the solder ball mounting device.
- the printed wiring board produced above was put into a reflow set at 230 degrees to obtain a printed wiring board with solder balls.
- Example 3-2 a printed wiring board was prepared according to Example 3-1, and solder balls having a diameter of 80 ⁇ were used.
- the mounting cylinder 24 contains black circle powder.
- a mounting cylinder 24 made of conductive resin was used.
- the conductive flexible resin was used, instead of this, conductive rubber mixed with metal powder can be used.
- the embodiment 3-2 has an advantage that even if the tip of the mounting cylinder 24 comes into contact with the ball alignment mask 16, the ball alignment mask is hardly damaged.
- Example 3-3 a printed wiring board was prepared according to Example 3-1 and solder balls having a diameter of 80 ⁇ were used.
- the mounting cylinder 24 is formed by coating the surface of the resin core member 21 with a conductive metal film 23 such as aluminum-um by vapor deposition or the like.
- Example 3-3 has the advantage that the mounting cylinder 24 can be manufactured at low cost.
- Example 3-4 a printed wiring board was prepared according to Example 3-1, and the solder balls having a diameter of 80 ⁇ were used.
- the mounting cylinder 24 used was one in which a conductive metal foil 23f such as a copper foil was attached to the lower end and the inner peripheral surface of the resin core member 21.
- the conductive metal foil 23f is grounded to the solder ball mounting device 20 main body side by a ground wire (not shown).
- Embodiment 3-4 has the advantage that the mounting cylinder 24 can be manufactured at low cost.
- Example 3 a printed wiring board was prepared according to Example 3-1, and the solder balls had a diameter of 80 m.
- the one of ⁇ was used.
- the mounting cylinder 24 was made of insulating resin.
- Example 3-1 a solder ball having a diameter of 80 ⁇ was mounted on a printed wiring board using a ball alignment squeegee as in the prior art.
- solder bumps were formed using solder paste instead of solder balls in Example 3-1.
- Example 3-1 and Comparative Example 3-2 an IC was mounted on the printed wiring board of Example 3-1 and Comparative Example 3-2, and an underfill was filled between the IC and the printed wiring board to obtain an IC-mounted printed wiring board.
- the connection resistance of a specific circuit connected to the back side of the IC-mounted printed wiring board via the IC was measured again as the initial value through the back side of the IC-mounted printed wiring board (the side opposite to the IC mounting surface). After measuring the initial value, leave it in an atmosphere of 85 ° CX 80% for 15 hr, and then continue the heat cycle test 1000 times at 55 ° CX for 5 minutes and 125 ° CX for 5 minutes. Resistance was measured and connection reliability was examined.
- connection resistance value after heat cycle—initial connection resistance value Z initial connection resistance value
- X 100 connection resistance value after heat cycle—initial connection resistance value
- the configuration of the multilayer printed wiring board 10 manufactured using the solder ball mounting method and mounting apparatus according to Example 4 of the present invention will be described below.
- the configuration of the multilayer printed wiring board 10 of the fourth embodiment is the same as that of the first embodiment described above with reference to FIGS.
- the manufacturing process is the same as that of the first embodiment described above with reference to FIG.
- the solder ball mounting apparatus of the fourth embodiment is substantially the same as the first embodiment described above with reference to FIG. 1 except for the structure of the mounting cylinder 24.
- FIG. 13 (A) is an explanatory view showing, in an enlarged manner, the connection pad region 75A of the multilayer printed wiring board 10A and the mounting cylinder 24 of the fourth embodiment shown in FIG.
- the mounting cylinder 24 has a lower end opening 24A (see FIG. 2B) formed in a rectangular shape. Therefore, the solder balls can be assembled into a substantially rectangular shape, and the solder balls can be efficiently mounted on the connection pads 75 in the connection pad region 75A having a substantially rectangular shape.
- the side ax (length of the inner wall) 24X parallel to the mounting cylinder movement direction (X direction) of the opening is the length ax of the side 75X of the connection pad area 75A parallel to the mounting cylinder movement direction. It is set to a (l. 1-4) times X.
- the side by the side (inner wall length) 24Y perpendicular to the mounting tube movement direction of the opening (Y direction) is set to the length y of the side 75Y of the connection pad area 75A perpendicular to the mounting tube movement direction.
- it is set to b (l. 1 to 4) times. Therefore, the solder balls can be collected on the connection pad area 75A (on the ball alignment mask located on the connection pad area) of the printed wiring board.
- the ratio is less than 1 times, as shown in FIG. 15 (A), the solder ball group (aggregate of solder balls) 7 8G gathers too much inside, and the connection pad 75 on the outer periphery of the connection pad region 75A Solder balls cannot be mounted.
- connection pads 75 are not arranged in a rectangular shape, x and y include the outermost connection pads so that the rectangular area of the connection pad region 75A is minimized.
- the solder ball group 78G can be formed so as to be long in the moving direction (X direction) of the mounting cylinder 24 with respect to the connection pad region 75A having a substantially rectangular shape.
- the mounting cylinder 24 of the solder ball mounting device 20 and the suction ball removing cylinder 61 are arranged on individual multi-layer printed wiring boards 10A. Multiple Y-directions are arranged corresponding to 75A.
- one mounting cylinder 24 corresponds to one connection pad area 75A, but the mounting cylinder 24 may be sized to correspond to a plurality of connection pad areas 75A.
- the Y direction is convenient and may be arranged in the X direction.
- the ⁇ suction table 14 positions, sucks, holds, and corrects the multilayer printed wiring board 10 on which the solder balls are mounted.
- the alignment camera 46 detects the alignment mark of the multilayer printed wiring board 10 on the ⁇ suction table 14, and the positions of the multilayer printed wiring board 10 and the ball alignment mask 16 are determined based on the detected position. Adjusted.
- the remaining amount detection sensor 18 detects the remaining amount of solder balls by an optical method.
- solder ball mounting process by the solder ball mounting apparatus 20 of the fourth embodiment is the same as that of the first embodiment described above with reference to FIGS.
- a double-sided copper-clad laminate (for example, MCL-E-6 7 manufactured by Hitachi Chemical Co., Ltd.) was used as a starting material, and through-hole conductors and conductor circuits were formed on this substrate by a known method. After that, interlayer insulation layers and conductor circuit layers are alternately laminated by a well-known method (for example, “Build-up multilayer printed wiring board” published by Nikkan Kogyo Shimbun on June 20, 2000) In the outermost conductor circuit layer, a connection pad group was formed for electrical connection to the IC, and the connection pad group had 2000 ⁇ connection pads in the connection pad area (70mm 2 : 10mm x 7mm).
- via-hole connection pads solder bumps are formed directly above the via holes
- the preferred amount of dents and protrusions (see Fig. 12) for filled vias is preferably in the range of 5 to 5 m with respect to the conductor thickness of conductor circuit 158! /. If the depth of the filled via dent exceeds 5 m (—5 m), the number of contact points between the solder ball and the connection pad that also has a filled via force will decrease, so the wettability will deteriorate when solder bumps are used, and voids will be trapped in the solder. It tends to be unloaded (missing bump). On the other hand, if it exceeds 5 / zm, the thickness of the conductor circuit 158 increases, so it is not suitable for fine lines.
- a commercially available solder resist was formed on it (thickness 20 m), and an opening of 90 ⁇ was formed by photographic method in the solder resist on the connection pad to expose the connection pad.
- a commercially available rosin flux was applied to the surface (IC mounting surface) of the printed wiring board fabricated in (1). After that, it is mounted on the suction table of the above-described solder ball mounting device of the present invention, and the printed wiring board and the alignment mark of the ball alignment mask are recognized using a CCD camera, and the printed wiring board and the ball alignment mask are positioned.
- the ball alignment mask a Ni metal mask having an opening of 110 ⁇ at a position corresponding to the connection pad of the printed wiring board was used.
- the thickness of the metal mask is preferably 1/4 to 3/4 of the solder ball.
- the opening diameter formed in the ball alignment mask is preferably 1.1 to 1.5 times the diameter of the ball used.
- a SUS mounting cylinder with a size corresponding to the connection pad area (1.1 to 4 times the area where the connection pad is formed) and a height of 200 mm is used.
- a Sn63Pb37 solder ball (manufactured by Hitachi Metals Co., Ltd.) having a ball diameter of 80 ⁇ was placed on the ball alignment mask in the vicinity of the periphery of the metal mask (ball alignment mask) with a clearance of ⁇ 4 times.
- the force Sn using SnZPb solder for the solder balls and Pb-free solder selected from the group of Ag, Cu, In, Bi, Zn, etc. may be used.
- Parameter (1) Suction amount from the suction part at the top of the mounting cylinder (2LZmin to 500LZmin)
- Parameter (2) Clearance between the mounting cylinder and ball alignment mask (0.5 to 2.5 times the solder ball diameter)
- Parameter (3) Area of the bottom opening 24 (A) of the mounting cylinder (see Fig. 2 (B) and Fig. 9) [0117]
- the wind speed between the mounting cylinder and the ball alignment mask is 5 to 35 mZsec.
- the wind speed in the cylinder can be set to 0.1 lmZsec to 2 mZsec.
- the size of the mounting cylinder does not need to be enlarged to the same size as the connection pad area (electronic component mounting area)!
- the enlargement magnification of the mounting cylinder relative to the connection pad area is preferably larger on the moving direction side. As described above, when the mounting cylinder becomes larger in the moving direction, the solder balls exist wider in the moving direction as described above with reference to FIG. As a result, the solder ball mounting rate is improved.
- the mounting cylinder was sent at a moving speed of 20 mmZsec to move the solder ball, and the solder ball was dropped from the opening of the ball alignment mask to mount the solder ball on the connection pad.
- the solder ball alignment mask and the printed wiring board were also removed separately from the solder ball mounting device force.
- the printed wiring board produced above was put into a reflow set at 230 degrees to obtain a printed wiring board with a solder ball.
- Suction volume 25LZmin (Suction part diameter: 6.5mm ⁇ )
- Parameter (1) was adjusted within the range of Example 4 1 so that the wind speed between the mounting cylinder and the ball alignment mask was l ⁇ 17m / sec, and the wind speed in the mounting cylinder was 0.65m / sec or less.
- parameter 1 (1) is adjusted within the range of Example 4-1, and the wind speed between the mounting cylinder and the ball alignment mask is 5 to: LOmZsec, and the wind speed in the mounting cylinder is 0.65 m / sec or less. did. Moreover, since no single solder ball was sucked from the suction part, it was confirmed that the natural fall speed of the solder ball> the wind speed in the mounting cylinder.
- parameter 1 (1) is adjusted within the range of Example 4-1, so that the wind speed between the mounting cylinder and the ball alignment mask is 20-25 m / sec, and the wind speed in the mounting cylinder is 0.65 m / sec or less. It was. Moreover, since no single solder ball was sucked from the suction part, it was confirmed that the natural fall speed of the solder ball> the wind speed in the mounting cylinder. [0124] [Example 4 6]
- the wind speed was ll ⁇ 17m / sec, and the wind speed in the cylinder was 0.65m / sec or less. Also, since no single solder ball was sucked from the suction part, it was confirmed that the self-falling speed of the solder ball> the wind speed in the mounting cylinder.
- the wind speed was set to ll ⁇ 17m / sec, and the wind speed in the mounting cylinder was set to 0.65m / sec or less. Also, one solder ball is sucked from the suction part. I was able to confirm that the natural falling speed of the solder balls> the wind speed in the mounting cylinder.
- Parameter (1) was adjusted within the range of Example 4 1 so that the wind speed between the mounting cylinder and the ball alignment mask was l ⁇ 17m / sec, and the wind speed in the mounting cylinder was 0.65mZsec or less.
- the natural falling speed of the solder ball> the wind speed in the mounting cylinder since no single solder ball was sucked from the suction part, it was confirmed that the natural falling speed of the solder ball> the wind speed in the mounting cylinder.
- Parameter (1) was adjusted within the range of Example 4 1 so that the wind speed between the mounting cylinder and the ball alignment mask was l ⁇ 17m / sec, and the wind speed in the mounting cylinder was 0.65m / sec or less.
- the natural falling speed of the solder ball> the wind speed in the mounting cylinder since no single solder ball was sucked from the suction part, it was confirmed that the natural falling speed of the solder ball> the wind speed in the mounting cylinder.
- parameter (1) was adjusted within the range of Example 4-1, so that the wind speed between the mounting cylinder and the ball alignment mask was less than 5 m / sec, and the wind speed in the mounting cylinder was 0.65 m / sec or less. .
- the wind speed between the mounting cylinder and the ball alignment mask was ll ⁇ 17m / sec, and the wind speed in the mounting cylinder was 0.65m / sec or less. Also, since no single solder ball was sucked from the suction part, it was confirmed that the natural fall speed of the solder ball> the wind speed in the mounting cylinder.
- the wind speed between ll and 17m / sec was set to 6.6m / sec or less. Also, since no single solder ball was sucked from the suction part, it was confirmed that the natural fall speed of the solder ball> the wind speed in the mounting cylinder.
- Example 4-1- LO, Reference Example 4 In 1-6, the solder ball used was 40 ⁇ . With this change, the solder resist film thickness was 10 ⁇ m, the solder resist opening was 45 / ⁇ ⁇ , and the ball alignment mask opening was 50 / ⁇ ⁇ . The wind speed in the mounting cylinder was adjusted to 0.1 lm / sec. Other than that, it produced according to each Example 4 and each reference example 4.
- Example 4-1- LO, Reference Example 4 In 1-6, the solder ball used was 150 ⁇ . As a result of this change, the connection pad was 200 ⁇ , the solder resist opening was 170 ⁇ , and the ball alignment mask opening was 200 ⁇ . In addition, most of the connection pads were at a pitch of 250 m, and the number of connection pads was reduced to form the connection pad area within 130 mm 2 . Other than that, it was prepared according to each Example 4 and each Reference Example 4.
- Example 41 the solder ball mounting method was changed, and 80 ⁇ solder balls were mounted on a printed wiring board using a ball alignment squeegee as in the prior art.
- Example 4-11 the solder ball mounting method was changed, and 40 ⁇ solder balls were mounted on a printed wiring board using a ball alignment squeegee as in the prior art.
- Example 4-21 the solder ball mounting method was changed, and 150 ⁇ solder balls were mounted on a printed wiring board using a ball alignment squeegee as in the prior art.
- Example 4-31 the solder ball mounting method was changed, and 180 ⁇ solder balls were mounted on a printed wiring board using a ball alignment squeegee as in the prior art.
- solder bumps were formed using solder paste instead of solder balls in Example 4-1.
- the yield could be increased by increasing a and b by 1.1 to 4 times. It was also found that the yield can be further increased by making a larger than b. On the other hand, by adjusting the wind speed between the mounting cylinder and the ball alignment mask to 5 to 35 mZsec, it was possible to efficiently mount the solder balls on the connection pads.
- Example 4-1 was mounted on the printed wiring boards of Example 4-1 and Comparative Example 4-5, and an underfill was filled between the IC and the printed wiring board to obtain an IC-mounted printed wiring board.
- the amount of change in connection resistance is expressed as ((connection resistance value after heat cycle—initial connection resistance value) Z initial connection resistance value) X 100. If the value is within ⁇ 10%, pass, Beyond that, it is bad. As a result, Example 4-1 was “pass”, and Comparative Example 45 was “bad”.
- the configuration of the multilayer printed wiring board 10 manufactured using the solder ball mounting method and mounting apparatus according to Example 5 of the present invention will be described below.
- the configuration of the multilayer printed wiring board 10 of the fifth embodiment is the same as that of the first embodiment described above with reference to FIGS. Further, the solder ball mounting apparatus of the fifth embodiment is substantially the same as the first embodiment described above with reference to FIG.
- a method for manufacturing the multilayer printed wiring board 10A shown in FIG. 5 (A) will be described with reference to FIG. 18 and FIG.
- a solder resist layer 70 is provided on the surface of the multilayer printed wiring board 30 shown in FIG. 18 (A), and this is semi-cured (FIG. 18 (B)).
- the solder resist layer 70 has irregularities (difference XI) due to the conductor circuit 158 of the multilayer printed wiring board 30 (see FIG. 20 showing an enlarged part of FIG. 18B).
- a PET film 73 is applied to both sides of the semi-cured solder resist layer 70, and pressure is applied through the PET film 73 to flatten the surface of the solder resist layer 70 (FIG. 18C). ).
- a photo film 69 on which a circular pattern 69a corresponding to the opening is drawn is placed in close contact, and exposed with ultraviolet rays (FIG. 19A). afterwards, After development, heat treatment was performed at 80 ° C for 1 hour, 120 ° C for 1 hour, and 150 ° C for 3 hours.
- a solder resist layer 70 having 71 is formed (FIG. 19B).
- a nickel plating film 72 and a gold plating film 74 are formed on the connection pad 75 in the opening 71 (FIG. 19C).
- solder ball mounting device for example, Hitachi Metals, Tamura, diameter 40 ⁇ or more and less than 200 ⁇ . Solder balls with a diameter of less than 200 ⁇ ⁇ are desirable for finer applications. If the diameter is less than 40 ⁇ ⁇ , the solder balls are too light and do not fall on the connection pads.
- the solder ball when the diameter exceeds 200 ⁇ , the solder ball cannot be assembled in the cylindrical member because it is too heavy, and there is a connection pad on which the solder ball is not placed.
- the method of mounting the solder ball on the connection pad by sucking the solder ball with the suction head makes it difficult to suck because the solder ball is small, so the superiority of the method of Example 5 becomes clear .
- solder ball 78L is sucked and placed. After that, it is overheated in a reflow oven, and as shown in Fig. 6, solder bump 78U is placed on the upper side of the multilayer printed wiring board 10A at a pitch of 60 ⁇ m or more and less than 200 ⁇ m, for example 2000 to 30000 pieces, and the lower side is 2 mm pitch For example, 250 BGA78D are formed. If the pitch is less than 60 m, it becomes difficult to manufacture solder balls suitable for the pitch.
- the method can be manufactured without any problem, but it can also be manufactured by the conventional method. Furthermore, as shown in FIG. 8, after the multi-layer printed wiring board 10A for multiple pieces is cut into individual multi-layer printed wiring boards 10, IC chips 90 are mounted via solder bumps 78U by reflow. The multilayer printed wiring board 10 with the IC chip 90 mounted is attached to the daughter board 94 through the BGA78D. [0152]
- the solder ball mounting process by the solder ball mounting apparatus 20 of the fifth embodiment is the same as that of the first embodiment described above with reference to FIGS.
- Example 5 even on a printed wiring board with many undulations on the surface, such as a build-up multilayer wiring board, the surface of the semi-cured or dried solder resist layer is pressed with a flat member such as a PET film. As a result of the flattening, the surface of the ball alignment mask on the printed wiring board is also flattened, and the solder balls can be appropriately placed on the connection pads by moving on the ball alignment mask.
- a double-sided copper-clad laminate (for example, MCL-E-6 7 manufactured by Hitachi Chemical Co., Ltd.) was used as a starting material, and through-hole conductors and conductor circuits were formed on this substrate by a known method. After that, interlayer insulation layers and conductor circuit layers are alternately laminated by a well-known method (for example, “Build-up multilayer printed wiring board” published by Nikkan Kogyo Shimbun on June 20, 2000) In the outermost conductor circuit layer, a group of connection pads was formed for electrical connection to the IC, where the connection pads that also have via-hole force (solder bumps formed directly above the via holes) are filled vias and the amount of depressions The convex amount (see Fig.
- connection pad 12 is preferably in the range of 5 to 5 ⁇ m with respect to the conductor thickness of the conductor circuit 158. If the recessed amount of the filled via exceeds 5 ⁇ m (5 m), the solder ball and filled via Since there are fewer contact points on the connecting pad, which is also powerful, the wettability is poor when solder bumps are formed, and voids are likely to get in the solder or not mounted (mixing bumps), but over 5 / zm And conductor circuit of 158 Since only becomes thicker, not suitable to finer addition, planarization is also difficult connection pad group to be described later, 1 20 ⁇ , conductor thickness:.. 15 m ⁇ 20 connecting the connection pads of mu m pad area (70 mm 2 : 10 mm x 7 mm), most of which are arranged in a grid with a pitch of 150 ⁇ m
- a commercially available solder resist ink was formed on the surface on which the connection pads were formed by printing under the following printing conditions by screen printing.
- Solder resist ink RPZ— 1 (manufactured by Hitachi Chemical Co., Ltd.)
- solder resist ink is printed on the other surface under the same conditions, and dried at 60 to 70 degrees for 20 to 25 minutes to form a semi-cured solder resist layer. did. Thereafter, some unevenness in the connection pad region was measured with a surface roughness meter (for example, rsURFCOM480Aj manufactured by Tokyo Seimitsu Co., Ltd., WYKO “NT2000” manufactured by Bikone Soil) (number of measurements was 5).
- “Unevenness measurement part and unevenness amount Measure the interface between the height of the solder resist layer surface on the connection pad and the adjacent non-connection pad part (the part without conductor circuit) solder resist layer surface height (Fig. 18 (B) And, refer to Fig. 20 which shows the measurement part of Fig. 18 (B) in an enlarged manner), and the difference in height is defined as the amount of unevenness (XI in the figure).
- the chart shows the minimum (min) and maximum (max) measured values.
- PET films were attached to both sides of the solder resist layer, and the solder resist layer was flattened by applying pressure to the solder resist layer through the PET film.
- the conditions at that time are preferably a press temperature: 30 to 100 ° C., a press pressure: 1.0 to: L0 MPa, and a press time: 20 seconds to 5 minutes. If the temperature is less than 30 ° C, the solder resist is hard and flatness becomes difficult. On the other hand, when it exceeds 100 ° C, it becomes too soft, and when pressed, the thickness of the solder resist becomes too thin. If the press pressure is less than 1. OMPa, it will be difficult to flatten.
- a commercially available rosin flux was applied to the surface (IC mounting surface) of the printed wiring board fabricated in (1). After that, it is mounted on the suction table of the solder ball mounting device of the present invention described above, and the alignment marks of the printed wiring board and the ball alignment mask are recognized using a CCD camera. The printed wiring board and the ball alignment mask were aligned.
- the ball alignment mask a Ni metal mask having an opening of 110 ⁇ at a position corresponding to the connection pad of the printed wiring board was used.
- the thickness of the metal mask is preferably 1/4 to 3/4 of the solder ball.
- the opening diameter formed in the ball alignment mask is preferably 1.1 to 1.5 times the diameter of the ball used.
- a SUS mounting cylinder with a size corresponding to the connection pad area (1.1 to 4 times the area where the connection pad is formed) and a height of 200 mm is used.
- a Sn63Pb37 solder ball (manufactured by Hitachi Metals Co., Ltd.) having a ball diameter of 80 ⁇ was placed on the ball alignment mask in the vicinity of the periphery of the metal mask (ball alignment mask) while maintaining a clearance of ⁇ 4 times.
- force Sn using SnZPb solder for the solder balls and Pb-free solder in which group forces such as Ag, Cu, In, Bi, Zn, etc. are also selected may be used.
- the mounting cylinder was sent at a moving speed of 20 mmZsec to move the solder ball, and the solder ball was dropped from the opening of the ball alignment mask to mount the solder ball on the connection pad.
- the mounting cylinder 24 is made of a conductive metal such as SUS stainless steel, Ni, or Cu, and is grounded to the solder ball mounting device 20 side.
- the solder ball alignment mask and the printed wiring board were removed separately from the solder ball mounting device.
- the printed circuit board with solder balls was made by reflowing at 230 degrees.
- solder bumps After forming the solder bumps, an IC chip was mounted via the solder bumps, and then a commercially available underfill agent was filled between the IC chip and the solder resist and cured to obtain an IC-mounted printed wiring board.
- Example 5-2 in Examples 5-1, the number of connection pads 2000 and 4000, the electronic components mounting area (connecting pad region) area was 130 mm 2 modified ⁇ this from 70 mm 2.
- Example 5-3 In Example 5-3, the number of connection pads was changed from 2000 to 10000, and the electronic component mounting area was changed from 70 mm 2 to 310 mm 2 in Example 5-1.
- Example 5-4 the number of connection pads was changed from 2000 to 30000 and the electronic component mounting area was changed from 70 mm 2 to 1200 mm 2 in Example 5-1.
- Examples 5-5 to 8 the flatness conditions of the solder resist in Examples 5-1 to 4 were changed to a pressure of 5 Mpa, a time of 2 minutes, and a temperature of 60 degrees.
- Example 5-9 to 12 the flatness condition of the solder resist in Examples 5-1 to 4 was changed to a pressure of 3 MPa, a time of 2 minutes, and a temperature of 80 degrees.
- Example 5-17 the same force as in Example 5-1 Solder resist thickness was 25 m.
- solder ball of ⁇ / ⁇ ⁇ was used. Then, the solder balls were directly moved onto the printed wiring board without using a ball alignment mask. That is, the flux 71 is filled in the opening 71 of the printed wiring board shown in FIG. 21 (A), and the printed wiring board is shown in FIG. 21 ( ⁇ ).
- the mounting cylinder 24 was transferred onto 10A, and a solder ball 78s was mounted in the opening 71.
- solder bumps were formed using solder paste instead of solder balls in Example 5-1.
- Example 5 1-17, Comparative Example 5—On IC printed wiring board manufactured according to 1-4, V, HAST test (high temperature, high humidity, bias test: 85 while applying voltage between independent bumps ° CX 85% / 3. 3V). After 50, 100, and 150 hours, the insulation resistance between the bumps to which a voltage was applied was measured. If the measurement result is 10 7 ⁇ or more, it is qualified ( ⁇ ), and if it is less, it is bad (X). It should be noted that, if it can withstand a 50-hour HAST test, it is more desirable to be able to withstand a force that provides the performance required for practical use for 100 hours.
- CX 5 minute heat cycle test 500 times, 1000 times, 1500 times, ⁇ Back side of IC printed wiring board (opposite side of IC mounting surface) The amount of change in the connection resistance of a specific circuit connected to the back of the board was measured, and the connection reliability was examined.
- the amount of change in connection resistance is expressed as ((connection resistance value after heat cycle initial connection resistance value) Z initial connection resistance value) X 100. If the value is within ⁇ 10%, pass ( ⁇ ), other than that was considered as defective (X). It should be noted that, if it can withstand 500 heat cycle tests, it is more desirable to be able to withstand 1000 times of force with the performance required in practice.
- the amount of unevenness described above is preferably 0.3 to 6.5 m force, more preferably 0.8 to 5 / ⁇ ⁇ , and particularly preferably 0.8 to 3 / ⁇ ⁇ .
- the amount of unevenness is not limited to the fifth embodiment, and combinations other than the fifth embodiment can be realized by combining within the ranges of the press pressure, press temperature, and press time described above.
- connection reliability is lowered.
- the ball alignment mask does not follow the surface of the solder resist, and the distance from the connection pad surface to the surface of the ball alignment mask opening (the connection pad surface force is also far) Due to the large variation, two or more solder balls are mounted on connection pads with a large distance. As a result, an abnormal bump is generated, and it is assumed that the insulation resistance decreases between the connection pads.
- stress due to the difference in thermal expansion coefficient between the IC and the printed wiring board concentrates on the low bump, which reduces connection reliability.
- the method for leveling the solder resist is as follows: (1) After applying the solder resist composition, before drying or curing it (including the semi-cured state), the surface of the solder resist layer is squeegee, blade, roll coater. Or (2) After applying or applying the solder resist composition, drying or curing it (including the semi-cured state), and then pressing the surface of the solder resist layer, Alternatively, it is desirable to be performed by grinding or polishing.
- pressing the force on the resin film is also effective. It is desirable to do.
- the pressing conditions are preferably performed in the range of pressing temperature: 30 to 100 degrees, pressing pressure: 1.0 to: LOMPa, and time: 2 Osec to 3 min.
- solder resist a commercially available product can be used.
- RP Z-1 manufactured by Hitachi Chemical Co., Ltd.
- DPR-805GT7 manufactured by Asahi Chemical Laboratory Co., Ltd.
- PSR-400 0 manufactured by Taiyo Ink Manufacturing Co., Ltd. Series can be used.
- connection resistance value after heat cycle—initial connection resistance value Z initial connection resistance value
- X 100 connection resistance value after heat cycle—initial connection resistance value
- FIG. 1 (A) is a configuration diagram showing a configuration of a solder ball mounting apparatus according to an embodiment of the present invention
- FIG. 1 (B) is a solder ball mounting of FIG. 1 (A). This is a view of the device as seen from the arrow B side force.
- FIG. 2 (A) is an explanatory view of positioning of a multilayer printed wiring board
- FIG. 2 (B) is an explanatory view of supply of solder balls to a mounting cylinder.
- FIG. 3 (A) is an explanatory diagram of the assembly of solder balls by the mounting cylinder
- FIG. 3 (B) is an explanatory diagram of the assembly and guidance of solder balls by the mounting cylinder.
- FIG. 4 (A) is an explanatory view of the dropping of the solder ball onto the connection pad
- FIG. B (B) is an explanatory view of the removal of the solder ball by the suction ball removing cylinder.
- FIG. 6 is a cross-sectional view of a multilayer printed wiring board.
- FIG. 8 is a plan view of a multi-layer printed wiring board for taking multiple pieces.
- FIG. 9 (A), FIG. 9 (B), and FIG. 9 (C) are explanatory views of the tally between the mounting cylinder and the alignment mask in the second embodiment.
- FIG. 10 shows the solder balls when the clearance of the mounting cylinder is the same in the front and rear, left and right.
- FIG. 10 (B) is a schematic diagram illustrating the movement of the solder ball when the clearance of the mounting cylinder in Example 2 is different from front to back and left and right in FIG. 10 (C1).
- To (C3) are schematic diagrams for explaining the movement of the solder ball when the mounting cylinder is larger than the front-rear clearance and the left-right clearance.
- FIG. 11 is a chart showing the evaluation results of Example 2 and Comparative Example 2.
- FIG. 12 is an explanatory diagram of the unevenness of filled vias.
- FIG. 13 (A) is an explanatory view showing the correspondence between the connection pad region of Example 3 and Example 4 and the mounting cylinder
- FIG. 13 (B) is a diagram showing solder assembled by the mounting cylinder
- FIG. 13C is an explanatory diagram of a ball group
- FIG. 13C is a plan view of another example of the connection pad region.
- FIG. 14 (A) is a cross-sectional view of the mounting cylinder of Example 3-2
- FIG. 14 (B) is a cross-sectional view of the mounting cylinder of Example 3-3
- FIG. FIG. 6 is a cross-sectional view of a mounting cylinder of Example 3-4.
- FIG. 15 (A) is an explanatory view showing the correspondence between the mounting cylinder and the solder ball group with a and b of less than 1.1 in Example 4, and
- FIG. FIG. 7 is an explanatory diagram showing the correspondence between a mounting cylinder with b exceeding 4 and a solder ball group.
- FIG. 16 is a chart showing the evaluation results of Example 4, Reference Example 4 and Comparative Example 4.
- FIG. 18 (A), FIG. 18 (B), and FIG. 18 (C) are explanatory views of the manufacturing process of the multilayer printed wiring board according to the fifth embodiment.
- FIG. 19 (A), FIG. 19 (B), and FIG. 19 (C) are explanatory views of the manufacturing process of the multilayer printed wiring board according to the fifth embodiment.
- FIG. 20 is an enlarged cross-sectional view of the multilayer printed wiring board in FIG. 18 (B).
- FIG. 21 (A) is a cross-sectional view of a printed wiring board of Example 5-1
- FIG. 21 (B) is an explanatory view of mounting of solder balls on the printed wiring board.
- FIG. 22 is a chart showing evaluation results of Example 5 and Comparative Example 5.
- FIG. 23 (A), FIG. 23 (B), and FIG. 23 (C) are schematic views showing mounting of solder balls using a conventional ball alignment mask.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN2005800002716A CN1826844B (zh) | 2004-08-04 | 2005-07-22 | 焊球搭载方法及焊球搭载装置 |
EP05766192A EP1776004A4 (en) | 2004-08-04 | 2005-07-22 | METHOD AND DEVICE FOR FASTENING A SOLDERING BALL |
US11/371,083 US7475803B2 (en) | 2004-08-04 | 2006-03-09 | Solder ball loading method and solder ball loading unit background of the invention |
US12/328,347 US7866529B2 (en) | 2004-08-04 | 2008-12-04 | Solder ball loading method and solder ball loading unit |
Applications Claiming Priority (10)
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JP2004-227875 | 2004-08-04 | ||
JP2004227875 | 2004-08-04 | ||
JP2005-190496 | 2005-06-29 | ||
JP2005-190498 | 2005-06-29 | ||
JP2005190496A JP4118283B2 (ja) | 2004-08-04 | 2005-06-29 | 半田ボール搭載方法及び半田ボール搭載装置 |
JP2005190498A JP4118285B2 (ja) | 2004-08-04 | 2005-06-29 | 半田ボール搭載装置及び半田ボール搭載方法 |
JP2005-190499 | 2005-06-29 | ||
JP2005190497A JP4118284B2 (ja) | 2004-08-04 | 2005-06-29 | 半田ボール搭載装置及び半田ボール搭載方法 |
JP2005190499A JP4118286B2 (ja) | 2004-08-04 | 2005-06-29 | 半田ボール搭載方法 |
JP2005-190497 | 2005-06-29 |
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US11/371,083 Continuation US7475803B2 (en) | 2004-08-04 | 2006-03-09 | Solder ball loading method and solder ball loading unit background of the invention |
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WO2006013742A1 true WO2006013742A1 (ja) | 2006-02-09 |
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US (2) | US7475803B2 (ja) |
EP (1) | EP1776004A4 (ja) |
KR (1) | KR100798662B1 (ja) |
CN (2) | CN102413643A (ja) |
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Cited By (5)
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WO2007072875A1 (ja) * | 2005-12-20 | 2007-06-28 | Ibiden Co., Ltd. | プリント配線板の製造方法 |
WO2007072876A1 (ja) * | 2005-12-20 | 2007-06-28 | Ibiden Co., Ltd. | プリント配線板の製造方法 |
WO2007086509A1 (ja) * | 2006-01-27 | 2007-08-02 | Ibiden Co., Ltd. | プリント配線板の製造方法 |
WO2007086508A1 (ja) * | 2006-01-27 | 2007-08-02 | Ibiden Co., Ltd. | 半田ボール搭載方法及び半田ボール搭載装置 |
WO2007123190A1 (ja) * | 2006-04-26 | 2007-11-01 | Ibiden Co., Ltd. | 半田ボール搭載方法及び半田ボール搭載装置 |
Families Citing this family (26)
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WO2007086508A1 (ja) * | 2006-01-27 | 2007-08-02 | Ibiden Co., Ltd. | 半田ボール搭載方法及び半田ボール搭載装置 |
US8091766B2 (en) | 2006-01-27 | 2012-01-10 | Ibiden Co., Ltd. | Method and apparatus for loading solder balls |
JPWO2007086508A1 (ja) * | 2006-01-27 | 2009-06-25 | イビデン株式会社 | 半田ボール搭載方法及び半田ボール搭載装置 |
US8083123B2 (en) | 2006-01-27 | 2011-12-27 | Ibiden Co., Ltd. | Method for manufacturing a printed wiring board |
JP4592762B2 (ja) * | 2006-01-27 | 2010-12-08 | イビデン株式会社 | 半田ボール搭載方法及び半田ボール搭載装置 |
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CN101422090B (zh) * | 2006-04-26 | 2010-12-08 | 揖斐电株式会社 | 焊锡球搭载方法及焊锡球搭载装置 |
EP2012569A4 (en) * | 2006-04-26 | 2010-06-02 | Ibiden Co Ltd | METHOD FOR ASSEMBLING A SOLDERING BALL AND DEVICE FOR ASSEMBLING A SOLDERING BALL |
JP4647007B2 (ja) * | 2006-04-26 | 2011-03-09 | イビデン株式会社 | 半田ボール搭載装置 |
US8001683B2 (en) | 2006-04-26 | 2011-08-23 | Ibiden Co., Ltd. | Solder ball loading method |
JPWO2007123190A1 (ja) * | 2006-04-26 | 2009-09-03 | イビデン株式会社 | 半田ボール搭載方法及び半田ボール搭載装置 |
EP2012569A1 (en) * | 2006-04-26 | 2009-01-07 | Ibiden Co., Ltd. | Method for mounting solder ball and apparatus for mounting solder ball |
US7472473B2 (en) | 2006-04-26 | 2009-01-06 | Ibiden Co., Ltd. | Solder ball loading apparatus |
Also Published As
Publication number | Publication date |
---|---|
US20090084827A1 (en) | 2009-04-02 |
TW200623992A (en) | 2006-07-01 |
US7475803B2 (en) | 2009-01-13 |
EP1776004A1 (en) | 2007-04-18 |
KR20070010003A (ko) | 2007-01-19 |
US20060157540A1 (en) | 2006-07-20 |
EP1776004A4 (en) | 2009-09-02 |
CN1826844A (zh) | 2006-08-30 |
TWI322650B (ja) | 2010-03-21 |
KR100798662B1 (ko) | 2008-01-28 |
US7866529B2 (en) | 2011-01-11 |
CN1826844B (zh) | 2012-01-11 |
CN102413643A (zh) | 2012-04-11 |
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