Abstract:
A transistor wherein the collector contact of a platelike semiconductor of silicon is soldered to a metallic base and wherein the base carries two insulated terminals for coiled first end portions of two wirelike leads whose second end portions are soldered to the base and emitter contacts on the exposed surface of the semiconductor. The second end portion of the leads are parallel to the axes of coiled end portions and the internal diameters of such coiled end portions exceed the diameters of corresponding terminals. The connections between the terminals and the coiled end portions are established by solder which is applied over the coiled end portions in the form of annuli and melts while the parts of the transistor are conveyed through a soldering furnace. During such transport, the second end portions penetrate into soft solder of the base and emitter contacts, and the collector contact of the semiconductor is simultaneously soldered to the metallic base.
Abstract:
A switching contact system of a low-voltage circuit breaker has a bus with cord-like flexible conductors attached thereto. The flexible conductors are accommodated between a connecting surface (30) of the bus (26) and an end piece (27), which is in contact with the connecting surface (30) of the bus (26) with at least two contact surfaces. The parts are connected by heat effect, such as soldering or electron beam welding.
Abstract:
A method of soldering materials by controlling ultrasonic energy to effect melting of only the solder in an assembly to be joined that is carried on a low temperature melting substrate. The method facilitates making electrical connections for completing an electronic circuit unit that is supported on a low temperature melting substrate and comprises (a) positioning together first and second conductive terminals for said circuit with a solder deposit therebetween to form an assembly, at least one of the terminals of such assembly being supported directly on such low temperature melting substrate; (b) gripping the assembly between an ultrasonic motion generating horn and an anvil, while exciting the horn to apply ultrasonic vibration to the first terminal to provide sufficient shearing energy that frictionally rubs at least one surface of the solder deposit in a rubbing direction generally parallel to said one surface to rapidly heat and melt the solder deposit; and (c) essentially immediately upon the completion melting of the solder deposit, ceasing the application of ultrasonic shearing energy to allow the solder to solidify and form a soldered diffusion joint between the terminals.
Abstract:
A method is disclosed for equalizing the electrical resistance of two or more magnetoresistor sensor elements positioned on a permanent magnet in a sensor assembly. The method may utilize a laser to reduce the magnetic field of the portion of the permanent magnet underlying the sensor with the higher electrical resistance.
Abstract:
Electrical solder compositions (by weight percent) having between 91.5-96.5% Sn; 2-5% Ag; 0.1-3% Ni; and 0-2.9% Cu; and having a melting temperature 220.degree. C. or less. The solder compositions have microstructure with uniformly dispersed fine grains of Sn--Ni, Sn--Cu and Sn--Cu--Ni intermetallic phases that provide resistance to grain growth during thermal cycling.
Abstract:
A new material processing apparatus using a short-pulsed, high-repetition-rate visible laser for precision micromachining utilizes a near diffraction limited laser, a high-speed precision two-axis tilt-mirror for steering the laser beam, an optical system for either focusing or imaging the laser beam on the part, and a part holder that may consist of a cover plate and a back plate. The system is generally useful for precision drilling, cutting, milling and polishing of metals and ceramics, and has broad application in manufacturing precision components. Precision machining has been demonstrated through percussion drilling and trepanning using this system. With a 30 W copper vapor laser running at multi-kHz pulse repetition frequency, straight parallel holes with size varying from 500 microns to less than 25 microns and with aspect ratios up to 1:40 have been consistently drilled with good surface finish on a variety of metals. Micromilling and microdrilling on ceramics using a 250 W copper vapor laser have also been demonstrated with good results. Materialogroaphic sections of machined parts show little (submicron scale) recast layer and heat affected zone.
Abstract:
A solder dispensing apparatus for depositing fluid solder into and around a pin-in-through-hole joining zone of an electronic circuit board which comprises: a valve assembly defining a valve chamber with an inlet and an outlet, and having the valve member actuated by the pin of said pin-in-through-hole joining zone when the valve is positioned at the zone against the board, the valve member moving from a first position closing off fluid flow from the outlet to a second position permitting fluid flow through the outlet; means for measuring a predetermined body of fluid solder that is released from the chamber when said valve member is in the second position with the assembly positioned at the zone against the board; and means to contain the released fluid solder in a predetermined shape and in and around the pin-in-through-hole joining zone while the solder solidifies.
Abstract:
An absorber head 10 picks up a plurality of soldering balls 1 from a container 2, and is shifted horizontally toward a substrate 31. In the midway of this shift movement, the absorber head 10 is stopped just above a flux storage 32 and then lowered to soak the soldering ball 1 in the flux 34 stored in the flux storage 32, thereby applying each soldering ball 1 with an adequate amount of flux. Thereafter, the absorber head 10 is again shifted horizontally until it reaches the substrate 31. Then, the absorber head 10 lowers the soldering ball 1 applied with flux, so that each soldering ball 1 is mounted on a corresponding electrode 31a provided on the substrate 31. If any soldering balls 1 are left in the flux storage 32 due to failure of the pickup operation by the absorber head 10, such soldering balls 1 are surely collected in a groove 36 by a wiping movement of a squeegee 37 which is associated with the flux storage 32.