Interglass Technology Ag

Ctc Analytics Ag

Urs Probst

Ladislav Kucera

Roman Arnet

The invention provides a method and a circuit arrangement for measurement of the current through an inductive load L wherein the current is fed into the inductive load L with the aid of a full-bridge circuit. By way of example, full-bridge circuits such as these are used to feed a current in a pulse-width-modulated form into a winding of a direct-current, stepping or plunger coil motor. A respective measurement device (Ra, Rb) is provided for each half-bridge. In this case, a respective measurement device (Ra, Rb) is arranged between in each case one series circuit of switching elements and ground (VSS) or the supply voltage (VDD), respectively, at which a respective voltage is tapped off, which is a measure of the current through the respective measurement device. The device for measurement of the current has at least one switching device (S), by means of which one of the two inputs (e, e) of differential amplifier (D) can be selectively connected to ground (VSS) or to the supply voltage (VDD), or to one of the two measurement devices.

Method and circuit arrangement for measurement of the current through an inductive load

The invention relates to a method for separating a cast lens from shell molds, whereby a separating tool exerts pressure on the lens but a height of the separating tool is guided along the interface between the lens and the shell mold to be separated from the lens. In a preferred embodiment the composite consisting of the lens and the shell molds is fixed on a holding device that can be rotated on an axis of rotation. The holding device is rotated by means of a first motor and the height of the separating tool is tracked by means of a second motor in relation to the height of the interface depending on the angle of rotation.

Method and device for separating a cast lens from a shell mold

A device for aligning a first and a second shell mold comprises a first gripper for holding the first shell mold, a second gripper for holding the second shell mold, and a centering station. Both grippers can be displaced relative to one another and relative to the centering station along a predetermined axis and can rotate individually as well as synchronously about the axis. The centering station comprises a supporting body, which supports spring elements arranged along a circle, said axis running through the center of the circle. For centering, the shell mold is moved into the centering station by the gripper and then removed from the gripper so that the shell mold is held solely by the spring elements. The radial forces of the spring elements uniformly acting upon the shell mold from all sides cause the shell mold to be displaced into the center of gravity of the forces. Afterwards, the shell mold is gripped once again by the gripper and moved out from the centering station.

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Zug, Switzerland

Urs Probst