Robert Boschgmbh

Hans Lutz

Gert Siegle

Helmut Adam

Erhard Gossl

Peter Schottle

Stacking device for uniform, especially platelike pieces

Separator shields are provided between the substrates subject to sputtering and the boundaries between cathodes or between portions of the cathodes exposing different materials to be sputtered by a glow discharge. The shields extend to a few millimeters' spacing from the cathode and are at a potential at or near ground potential within .+-. 50 volts of the potential of the substrates. A common rear and side shield and a common electrical feed-through connection is provided for the cathode structure or cathodes. The substrates may be passed repeatedly through the sputtering zone or, in a circular configuration, can be moved in a circular path, so as to facilitate alloy-type coatings by producing very thin layers in alternation. The shielding reduces masking of one material by another on the cathode by cross-sputtering, thereby maintaining close to constancy the sputtering rates of the different materials for up to several hundred hours of operation. The cathode base plate of a composite cathode can be repeatedly used in successive operations with new material to be sputtered.

Apparatus for concurrently sputtering different materials

The engine of a motor vehicle is used to accelerate a flywheel up to a suitable test speed through rollers engaged with driven wheels of the vehicle. Then, when the wheels are braked, one torsion coupling gives a signal corresponding to the total braking force on both wheels and another torsion coupling between two of the rollers gives a signal corresponding to the braking force on one wheel. The braking force on the other wheel is obtained through a subtraction circuit. For testing undriven wheels, the flywheel is first brought up to speed by means of a set of driven wheels, then a clutch is released to free the flywheel while the rollers are stopped and the undriven wheel brought into position, after which the clutch is re-engaged and the undriven wheels are tested. A slip rate circuit is provided to compare the speed of the rollers applying the energy of the flywheel to the wheels under test with the respective speeds of idler rollers engaged with the individual wheels to provide an indication when the brakes are applied too suddenly or to check the safe operation of an anti-lock brake control system if the vehicle is equipped with such a system.

Motor vehicle brake test apparatus and method

Copper is sputtered onto a substrate to make a solder-fast contact layer by carrying out the sputtering in a discharge of a monatomic gas containing 0.5 to 16% of air, nitrogen or oxygen which reduces the conductivity of the copper layer, but makes it resistant to alloying with a solution in solder, to an extent comparable with the results obtained by the provision of intermediate diffusion barrier layers. Best results are obtained in an argon discharge in the presence of an admixture of nitrogen or air between 2 and 4% by volume. The solder-wetting properties are not impaired.

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Stuttgart, Germany

Hans Lutz