Abstract: In an electronic component soldering method of connecting a terminal provided on a flexible substrate to an electrode of a rigid substrate, after solder-mixed resin in which solder particles are mixed in thermosetting resin has been applied onto the rigid substrate so as to cover the electrode, the flexible substrate is put on the rigid substrate and heat-pressed, whereby there are formed a resin part that bonds the both substrates by thermosetting of the thermosetting resin, and a solder part which is surrounded by the resin part and has narrowed parts in which the peripheral surface is narrowed inward in the vicinity of the terminal surface and in the vicinity of the electrode surface. Hereby, the solder parts are soldered to the electrodes and the terminal at acute contact angles so that the production of shape-discontinuities which lowers fatigue strength can be eliminated.

Abstract: To provide a components joining method and a components joining structure which can realize joining of components while securing conduction at a low electrical resistance with high reliability. In a construction in which by using a solder paste containing solder particles 5 in a thermosetting resin 3a, a rigid substrate 1 and a flexible substrate 7 are bonded by the thermosetting resin 3a, and a first terminal 2 and a second terminal 8 are electrically connected by the solder particles 5, a blending ratio of an activator of the thermosetting resin 3a in the solder paste is properly set and oxide film removed portions 2b, 8b, and 5b are partially formed in oxide films 2a, 8a, and 5a of the first terminal 2, the second terminal 8, and the solder particles 5.

Abstract: In a semiconductor device provided with a thinned semiconductor element, the present invention intends to inhibit damage of the semiconductor element in the neighborhood of its outer periphery so as to improve reliability. A plurality of external connection terminals are formed on a front surface of the thinned semiconductor element. A plate higher in rigidity than the semiconductor element is adhered with a resin binder to a rear surface of the semiconductor element. An outer shape of the plate is made larger than that of the semiconductor element, and the resin binder covers a side face of the semiconductor element to form a reinforcement portion for reinforcing a periphery of the semiconductor element.

Abstract: There is provided a flux for soldering and a soldering process which form better solder connection without the occurrence of the poor connection nor the insulation degradation. Such flux which is placed between a solder portion formed on a first electrode and a second electrode when the first electrode is soldered to the second electrode contains: a liquid base material made of a resin component which is dissolved in a solvent, an active component which removes an oxide film, and a metal powder made of a metal of which melting point is higher than that of a solder material which forms the solder portion, and the flux contains the metal powder in an amount in the range between 1% and 9% by volume based on a volume of the flux.

Abstract: It provides metal-powder-contained flux disposed between bumps and circuit electrodes when electronic parts are mounted by soldering, the metal powder comprises a core metal formed of metal such as tin and zinc and a surface metal covering surfaces of the core metal formed of noble metal such as gold and silver. Accordingly, metal powder will not remain as residue that is liable to cause migration after the reflow process, and it is possible to assure both soldering effect and insulation effect.

Abstract: In a solder paste 3 formed by allowing a resin component 3a having oxide removability to contain solder particles 4A, 4B, and 4C which are formed by coating the surfaces of core particles 6A, 6B, and 6C made of tin (Sn) or an alloy of tin with silver (Ag) coating films 7A, 7B, and 7C, the core particles are distributed to have such a particle distribution that the average particle diameter is in the range of 3 ?m to 7 ?m and 75% or more of the particles is in the range of 1 ?m to 9 ?m and the coating film is formed so that the core particles are coated with a silver coating film of an amount which occupies 1 to 4 wt % of the solder particles. Accordingly, it is possible to prevent oxide from being formed on the surfaces of the solder particles and to enhance the solder wettability at the time of soldering. In addition, it is possible to secure printability onto fine electrodes and to secure excellent solder adhesion with respect to a fine-pitch part by the use of a simple and low-cost method.

Abstract: In a mounting method for mounting a bump-equipped electronic component 5 with a plurality of metallic bumps 6 on a substrate 2 with a plurality of electrodes 3, during the process of connecting the metallic bumps 6 to the electrodes 3 by aligning the metallic bumps with the electrodes 3 with thermosetting resin 4 intervening between the electronic component 5 and substrate 2 and by pressing the electronic component 5 to the substrate 2 while exerting ultrasonic oscillation, heat and applied pressure on the electronic component 5, all of the metallic bumps 6 are brought into contact with the electrodes so that they are electrically connected to each other, and when some of the metallic bumps are metallic-bonded to the electrodes, ultrasonic oscillation is stopped. Thus, it is possible to prevent occurrence of damage owing to the excessive exertion of ultrasonic oscillation on the metallic bumps which have precedently started their metallic-bonding.

Abstract: A method of packaging an electronic component, which is capable of enhancing electrical and mechanical bonding reliability of the electronic component. Terminal (4) is provided on the side face of electronic component (1). Electrode (6) is formed on one or the other major surface of substrate (5) and terminal (4) provided in electronic component (1) is located on electrode (6). Solder paste produced by mixing solder particles with thermosetting flux is applied to electrode (6), terminal (4) of electronic component (1) is mounted on and brought into contact with the applied solder paste, and electronic component (1) is mounted on substrate (5) with clearance (S) provided between a part of electronic component (1) and opposing substrate (5). Solder bonding structure (8) for coupling terminal (4) and electrode (6) is formed by reflow. Solder bonding structure (8) includes solder bonding portion (8a), resin reinforcing portion (8b) and resin adhering portion (8c).

Abstract: In order to mount an electronic component, a connection terminal of the electronic component is bonded to electrodes of a substrate. This is done by using solder paste which mixes solder particles in a thermosetting adhesive. The solder paste is supplied to the electrodes and a recess. Solder print parts are formed. The electronic component is mounted and the connection terminal and the main body of the electronic component are adhered to the solder print parts, and are heated in this state by reflow. As a result, the connection terminal and the electrodes are bonded by a solder junction.

Abstract: In a semiconductor device of a structure comprising a thin semiconductor element bonded to a reinforcing plate via a bonding layer of a predetermined thickness, resin binder used for forming the bonding layer contains fillers including a first filler, which has a diameter generally equal to a target thickness of the bonding layer to be adjusted to a value within a range of proper thickness (from 25 ?m to 200 ?m). This can maintain the bonding layer within the range of proper thickness when the semiconductor element is bonded to the plate, and ensure on-board mounting reliability of the semiconductor device.

Abstract: There is provided a solder composition which contains: (1) a metal material comprising solder particles, and (2) a thermosetting flux material comprising a thermosetting resin and a solid resin which changes to be in its liquid-like state when heated with a proviso that the thermosetting resin is excluded from the solid resin, wherein a temperature at which the solid resin changes to be in the liquid-like state is lower than a temperature at which the thermosetting resin starts to cure.

Abstract: There is provided a solder composition which contains: (1) a metal material comprising solder particles, and (2) a thermosetting flux material comprising a thermosetting resin and a solid resin which transforms to its liquid-like state when heated with a proviso that the thermosetting resin is excluded from the solid resin.

Abstract: A method of soldering electronic component (6) having solder bumps (7) formed thereon to substrate (12), wherein bumps (7) are pressed against a flux transferring stage on which a thin film is formed of flux (10) containing metal powder (16) of good wettability to solder so as to cause metal powder (16) to penetrate oxide films (7a) and embed in the surfaces on the bottom parts of bumps (7), and bumps (7) in this state are positioned and mounted to electrodes (12a) on substrate (12). Substrate (12) is then heated to melt bumps (7) and allow the melted solder to flow and spread along the surfaces of metal powder (16) toward electrodes (12a). The method can thus provide solder bonding portions of high quality without any soldering defect and deterioration of the insulating property.

Abstract: In a mounting method for mounting a bump-equipped electronic component 5 with a plurality of metallic bumps 6 on a substrate 2 with a plurality of electrodes 3, during the process of connecting the metallic bumps 6 to the electrodes 3 by aligning the metallic bumps with the electrodes 3 with thermosetting resin 4 intervening between the electronic component 5 and substrate 2 and by pressing the electronic component 5 to the substrate 2 while exerting ultrasonic oscillation, heat and applied pressure on the electronic component 5, all of the metallic bumps 6 are brought into contact with the electrodes so that they are electrically connected to each other, and when some of the metallic bumps are metallic-bonded to the electrodes, ultrasonic oscillation is stopped. Thus, it is possible to prevent occurrence of damage owing to the excessive exertion of ultrasonic oscillation on the metallic bumps which have precedently started their metallic-bonding.

Abstract: In a semiconductor device provided with a thinned semiconductor element, the present invention intends to provide a semiconductor device in which a damage of a semiconductor element is inhibited from occurring in the neighborhood of an outer periphery and thereby the reliability can be secured. In order to realize the object, the invention relates to a semiconductor device in which to a rear surface of a thinned semiconductor element on a front surface of which a plurality of external connection terminals is formed, a plate higher in the rigidity than the semiconductor element is adhered with a resin binder, wherein an outer shape of the plate is made larger than that of the semiconductor element, and the resin binder covers a side face of the semiconductor element to form a reinforcement portion for reinforcing a periphery of the semiconductor element.

Abstract: The method of manufacturing a semiconductor device of the present invention comprises: forming a resin layer on a surface of a semiconductor wafer on which a plurality of semiconductor elements are formed, forming through-holes on the resin layer, a first cutting of either the semiconductor wafer or the resin layer, mounting conductive balls on the through-hole, connecting the conductive ball to electrodes of the semiconductor element, and a second cutting for dividing the wafer into each piece of semiconductor devices. With the processes of the present invention, conductive balls can be easily and effectively mounted on a wafer under optimum conditions, without failure such as slipping or falling down from the required position. This fact contributes to an increased efficiency and a good productivity in the production of semiconductor devices.

Abstract: A semiconductor device having a thinned semiconductor element that can be easily handled is manufactured with a method of manufacturing. The semiconductor device includes a semiconductor element and a bumper member bonded, as a reinforcing member, to a back surface opposite to an electrode-formed surface of the semiconductor element with an adhesive. The adhesive has a low elastic modulus and easily expands and contracts after bonding, and bonds the semiconductor element to the bumper member while allowing the semiconductor element to be deformed. Thus, the semiconductor device can be easily handled, and the semiconductor element can be deformed in response to the deformation of a substrate after being mounted. In addition, a thermal stress in a heat cycle can be alleviated effectively.

Abstract: In a semiconductor device of a structure comprising a thin semiconductor element bonded to a reinforcing plate with a bonding layer of a predetermined thickness, resin binder used for forming the bonding layer contains fillers including first filler, which has a diameter generally equal to a target thickness of the bonding layer to be adjusted to a value within a range of proper thickness (from 25 &mgr;m to 200 &mgr;m). This can maintain the bonding layer within the range of proper thickness when the semiconductor element is bonded to the plate, and ensure on-board mounting reliability of the semiconductor device.

Abstract: A semiconductor device assembly and a semiconductor device are provided which both can ensure reliability after a mounting process. The semiconductor device includes a semiconductor element equipped with bumps on an electrode patterned surface thereof for external connection. In the semiconductor device mounted on a substrate in the semiconductor device assembly, a semiconductor element shaped to have a thickness ranging from 200 &mgr;m to 10 &mgr;m has reduced flexural rigidity so as to be easily deflected. In the status that the bumps are joined to corresponding circuitry electrodes on the substrate, the semiconductor element can deflect at other portions other than its surface between two adjacent bumps according to contraction and distortion of the substrate. This allows the bumps to be dislocated in a direction parallel to a surface of the semiconductor element, hence relieving stress developed by the contraction of the substrate at the joint positions between the bumps and the circuitry electrodes.

Abstract: A conductive ball mounting equipment for mounting conductive balls on electrodes of a plurality of electronic components formed on a substrate, including a suction tool having a suction face to cover each one of divided blocks on the substrate, a suction part which is formed on the suction face of the suction tool, corresponding to the arrangement pitches of the electronic components and sucks the conductive balls to the positions corresponding to the electrodes, and a suction limiter for sucking the conductive balls only to the specified suction part corresponding to the electronic components in the divided blocks. According to this construction, the conductive balls can be efficiently and stably mounted on the electrodes of the electronic components of the substrate.